Beta Particles :: essays research papers

Point: I will examine how the field quality shifts the redirection of Beta Particles. Fundamental Work I began my fundamental work since, when I began my estimations utilizing 2 curls utilized in examinations to avoid electrons from and electron firearm. While testing for the diversion of beta particles, I found that beta radiation was dissipated in an exceptionally huge cone, I can not get any readings with measure of beta radiation dispersing. So I would need to develop some sort of protecting for this examination, this is so I can gauge the redirection all the more without any problem. The point at which the beta particles are being dissipated is 48o. Choosing the Type of Shielding I will test for the best protecting. The best properties of the shield will be; it very well may be pliable to frame various shapes and can be punctured, can stop radiation at a little thickness. Gear Strontium 90 beta source GM tube + counter Distinctive thickness of various metals Braces, supervisors and clip remain to hold the source and the material being tried. Technique 1. Set-up hardware as in the outline 2. Record the thickness and the material being utilized. 3. Record 5 readings of the radiation tally, and record them in a table 4. Supplant material being tried with various material or an alternate measured material. 5. Rehash stages 2 to 4 as required. Results The foundation radiation perusing is 2, 4, 6, 4, 5, 2. The normal check is 3.8 (1dp). End This shows aluminum stops radiation at 3.5 mm, this would be hard to utilize on the grounds that, this thickness of Aluminum isn't flexible and the aluminum isn't sufficiently delicate to cut. Lead can stop radiation at slim thickness', likewise lead is truly pliant and is sufficiently delicate to cut. I will utilize Lead shield at 0.6mm thick, since it is the most plentiful thickness' accessible and it is the least demanding to frame to any shape I need. Choosing how the protecting can be utilized. I need to have a tight light emission particles in this examination, so I will utilize my insight on what might be the most ideal approach to shield the source. An unshielded source The source is unshielded and has beta particles spreading out. Point Theta is the edge which the beta particles are dispersed through. The way of the beta particles is definitely not a straight line, yet a bend on the grounds that the beta molecule are avoided by the moles noticeable all around. The focuses A B are the farthest focuses where beta apportion is distinguished.

Methods for accident investigation Essay Example | Topics and Well Written Essays - 750 words

Techniques for mishap examination - Essay Example Causal elements can be separated into three sorts. The first of these is immediate reason, which depicts the quick perspective that caused the occasion. The second is a contributing reason, which acts with different occasions to build how likely the mishap was to happen. The last kind of cause is a root factor, which would keep the mishap from reoccurring in the event that it is adjusted. These perspectives can be resolved using distinctive investigative methodologies. The deductive methodology utilizes a thinking approach, which moves from a general point of view to a particular one, in light of the proposition of the disappointment of a particular framework or procedure. The subsequent methodology is inductive, which hypothesizes that a specific occasion of shortcoming has started the procedure. This is an outline approach. At long last, the morphological methodology utilizes the way that the framework that is being considered is organized. This thinks about what perspectives have the most huge impacts on wellbeing. A five-advance model was created by SINTEF for examining mishaps. The initial step is distinguishing the grouping of occasions the happened preceding the mishap, the second is deciding disappointments and deviations that affected the occasions. The third step includes working out the issues with the frameworks of the executives. The fourth step includes the ID of shortcomings in top administration. At long last, the fifth step includes finding the shortcomings in the open security system. When researching a mishap, one of the primary targets is detailing and the arrangement of suggestions, which can possibly keep comparable accidence from happening later on. The TRIPOD idea looks at the authoritative disappointments that are significant to mishap counteraction, in view of the contentions that unacceptable viewpoints happen as the aftereffect of systems inside association. These regularly happen because of choices in the association, and the basic instruments are

Zappos Company Case Study Example | Topics and Well Written Essays - 250 words

Zappos Company - Case Study Example ution is one of the components that can influence the income levels since it characterizes the quantity of clients that can be served over a predetermined period (Michelli, 2012). For instance, the foundation centers around online buys as the principle wellspring of income. Clearly, this is one of the achievement procedures of the firm since numerous individuals in the United States, United Kingdom and other European nations have turned to purchasing by means of the web (Gray and Vander, 2012). Be that as it may, the limit of the firm may not be all around abused since certain clients might be kept separate from the condition. Subsequently, this paper features the significance of ability to an establishment just as the ways to deal with be utilized to improve the circumstance. Quite, the organization has numerous representatives that serve the clients by means of the web, however the limit can be utilized to improve the income produced. Illustratively, a section of the market might not approach the web consistently, and they may require a physical market for the items. In such a circumstance, the clients need to visit the shops with the goal that they can make their educated buys. Chiefly, this may expand the incomes gathered by the firm. Also, a few people decide to secure items in the wake of learning the specific nature of materials utilized. In such a circumstance, the customers will feel the items and should fit in the garments, shoes and different clothes. Resultantly, the clients can make extra buys. Besides, pervasiveness of physical stores in various pieces of the market builds the odds of the representatives to make deals. A differing specialty showcase offers the firm an additional favorable position as the methodology energizes drive purchasing. Likewise, learns about shopper conduct refer to that a few people make a requirement for an item in the wake of seeing it (Lussier, 2012). Hence, the organization can improve its ability through presentation of extra shops in more areas. In conclusion, the measure of time used to put requests ought to be diminished

Exam Essay Samples - Learn How to Write Professional Papers

<h1>Exam Essay Samples - Learn How to Write Professional Papers</h1><p>Exam article tests are the main method to decide how an exposition will be reviewed. The math test is troublesome in light of the fact that there are a great deal of subtleties and measurements included. As the name infers, the commonplace math test will concentrate on things, for example, portions, decimals, rates, and conditions. There is a great deal of data to process when composing an exposition so it is ideal to set yourself up by taking the Provincial Math Exam.</p><p></p><p>The first thing that is frequently ignored is the date for the Provincial Exam. The date is ordinarily five days before the date of the genuine test and you should check with your neighborhood testing community for subtleties. They will for the most part advise you about the test date and time.</p><p></p><p>The math test is the primary thing that you should do so as to pl an for the English 12 common test. There are various types of article guides to browse when composing your exposition. This will decide the evaluation you will get for your paper. On the off chance that you will compose a paper dependent on measurements or extraordinary subjects, for example, craftsmanship, at that point the Provincial Exam will have a more noteworthy accentuation on such facts.</p><p></p><p>An exposition dependent on data about a region will in all likelihood be more diligently than one dependent on nation and world governmental issues. As a rule, articles dependent on areas will be more troublesome than world governmental issues papers. The Provincial Exam will concentrate on realities and measurable examination. A portion of the things that will be shrouded in this sort of article incorporate the economies of different areas, the size of the populace, the quantity of dialects spoken, financial action and other significant data about the va rious territories. In the event that you are keen on composing an exposition that depends on the regions, at that point it will be ideal to set yourself up by perusing some article models that depend on Canadian provinces.</p><p></p><p>The Provincial Exam is to a greater degree a dense variant of the full-lengthexam in light of the fact that there are not very many inquiries on punctuation and word use. The primary concern that will be secured is data and insights and ought to incorporate bunches of figures and pictures. The data will be utilized to assist understudies with understanding the region of Ontario, the region of Quebec, the territory of Manitoba, and the area of British Columbia.</p><p></p><p>In request to get ready for the test, you ought to do your exploration on what's in store on the test. The Provincial Exam is fundamentally the same as the full test yet there are a couple of various subtleties. It might be a smart tho ught to take the test a few times with the goal that you can comprehend the themes better.</p><p></p><p>The most regular errors that individuals make when composing expositions on the Provincial Exam are in language structure and sentence structure. Numerous individuals depend on the exposition tests that are given by Pearson yet there are a few hints that you can use too. Now and again, the Provincial Exam is a case of the individual adding an excessive amount to things, which can prompt issues later on in the exam.</p><p></p><p>The full assessment is the same amount of a test as the Provincial Exam, however there are less models accessible. You should discover increasingly about how to compose expositions on the full assessment before endeavoring it. You can locate a few online instruments that will assist you with figuring out how to viably peruse, tune in, and compose on the full examination.</p>

What Not to Write Your College Essay About - SparkNotes

<h1>What Not to Write Your College Essay About - SparkNotes</h1><p>You might need to comprehend what not to compose your school exposition about. This can be an extreme subject, yet fortunately there are numerous tips out there to assist you with composing a decent one. On the off chance that you follow these tips, you will have an elegantly composed article that will intrigue your potential employer.</p><p></p><p>Before you begin to expound on what not to compose your school exposition about, ensure you get into the outlook of what you ought to compose. The one that depends on what your aptitudes are. In the event that you have ability recorded as a hard copy, at that point utilize this to assist you with composing your essay.</p><p></p><p>You should have the option to consider the general subject of the article. It won't work to place your paper about your inclinations in your exposition. Your potential business won' t be intrigued by that.</p><p></p><p>The best spot to begin composing what not to compose your school exposition about is in the presentation. Start your presentation by expressing what your identity is and what kind of individual you are. The more data you can give in this area, the better.</p><p></p><p>The next activity is the thing that not to compose your school paper about and that is to plot your point. You have to list everything that you will cover in your article. Things like who are you, where are you from, how could you arrive, and what would you like to do with your life are everything that should be remembered for your outline.</p><p></p><p>Once you have your point, diagram it and set aside some effort to conceptualize a piece, consider an intriguing subject that will incorporate allof the above data. Make certain to search for inquiries just as answer them well. Utilizing the tips on what not to co mpose your school paper about will help you a lot.</p><p></p><p>If you don't have an individual involvement with the type of a story, at that point utilize an anecdote to cover what not to compose your school exposition about. Utilizing this strategy will help you since you will utilize narrating and wit. It will show your exposition journalists how energetic you are in writing.</p><p></p><p>There are numerous tips that you can use to kick you off with regards to what not to compose your school paper about. The key is to begin with what is directly for you. An elegantly composed exposition is the thing that you are going for so ensure that you get familiar with these tips.</p>

Rhodes College: When Should You Use Formal and Informal Styles?

<h1>Rhodes College: When Should You Use Formal and Informal Styles?</h1><p>If you need to compose a decent and commendable article on Rhodes College, you ought to find out about the customary, formal, and formal styles. You ought not keep yourself to simply utilizing the great styles and composing your paper utilizing just these two. You ought to likewise comprehend that you should utilize formal styles just as casual styles on the off chance that you need to compose a decent exposition on Rhodes College.</p><p></p><p>In the beginning of the Rhodes College, numerous understudies couldn't complete the course in three years. The school was set up so that they could proceed onward to Harvard in the wake of moving on from this school. There was a great deal of weight on the understudies to complete the course in three years and get to Harvard. This is the reason the understudies didn't feel great composing expositions on themes that were on the s chedule. You can utilize these sorts of subjects when you compose your own postulation articulation and get distributed in insightful journals.</p><p></p><p>In the early long stretches of the Rhodes College, the understudies didn't have a lot of opportunity with the points they needed to compose on. This is the reason they utilized casual and formal styles when composing expositions. They needed to hold their freedom and just as having a choice to compose all the more intriguing points on which they would be glad to get published.</p><p></p><p>In the present world, you can compose a decent paper on Rhodes College without utilizing formal styles. You can utilize casual and formal styles when you are composing an article on an assortment of points. This will empower you to completely investigate all themes that are critical to you.</p><p></p><p>Some understudies decide to utilize formal styles in their article on Rhodes College. They need to utilize exemplary styles when they compose a paper on themes that they know about. At the point when you don't pick formal styles, you can utilize casual styles aswell.</p><p></p><p>Even however you utilize a proper style, it doesn't imply that you can't utilize casual style when you are composing a paper on a subject that you are not very acquainted with. Indeed, you can compose a decent and commendable paper on Rhodes College in any event, when you are utilizing casual styles. You should utilize the two styles since they will supplement each other.</p><p></p><p>When you compose an exposition on points that you are not very acquainted with, you can generally utilize the exemplary style. Notwithstanding, you ought to likewise realize how to utilize the casual style when you are composing a paper on themes that you are not very acquainted with. Truth be told, you can utilize the two styles when you compose a n exposition on a subject that you are not very recognizable with.</p><p></p><p>In short, you ought to figure out how to utilize the two styles when you are composing a paper on points that you are not very acquainted with. This will permit you to completely investigate the themes that you need to expound on. You can be extremely effective when you are utilizing the two styles when you are composing a paper on points that you are not very natural with.</p>

The Honest to Goodness Truth on Ielts Essay Samples Task 2

<h1> The Honest to Goodness Truth on Ielts Essay Samples Task 2</h1> <h2> The Hidden Secret of Ielts Essay Samples Task 2</h2> <p>These realities will permit you to comprehend what the test is and the manner in which it's scored so you can proceed onward to improving your presentation. Possibly the best game plan is a sort of bargain. In the event that you need more data about our courses, if you don't mind don't hesitate to test them around here. See the previously mentioned PPT and video for more data about it. </p> <h2>The Ielts Essay Samples Task 2 Cover Up </h2> <p>Knowing the basic points will have the option to assist you with preparing for the test better. This page is going to show you exactly how to boost your IELTS composing task two score. Valid, you need to show IELTS the language you have, yet you don't have to have an awesome thought or give you know it all. </p> <p>A very much organized article has a ph enomenal presentation, body sections that are easy to follow and interface with one another, and an extraordinary end. This video lessoncontains a supportive exercise to help you construct longer sentences whendescribing diagrams. You should have a couple of sentences through and through. Presently, don't be worried about the serious extent of the model sentences above. </p> <p>An incredible end should be a review of your significant focuses. A brilliant equalization of basic and many-sided sentences is used to build up a contention. Furthermore, you can check the quantity of words speedily. Instances of incredible collocation incorporate preferences a sensible preliminary and tackle the troubles. </p> <p>Ielts composing task two example band 8 the composing some portion of your ielts test is an astonishing spot to score some extra focuses especially in the event that you are attempting to score inside band 8. At long last, everything goes to the decisions and work-style of the individual. Discover someone who will gracefully you with exact and valuable input on your work. Each test-taker fantasies about turning out to be inside data on the most recent test questions. </p> <p>Essays, be that as it may, may require somewhat more mental fortitude toward the beginning, however as you're as of now here searching for data, why no t in any case practice as well. Scholastic Task 1 grants you to show you may comprehend visual information and critically, you can portray it into a way that exhibits this comprehension. </p> <h2>The Ielts Essay Samples Task 2 Pitfall </h2> <p>This manage gives 5 special techniques that will help you rapidly consider pertinent thoughts which are legitimately identified with the inquiry. Since you've offered your input, you should back this up. It is significant to recall that it isn't significant what your conclusion is! Evaluate this conclusion paper question about the cost of room investigation. </p> <h2> What You Don't Know About Ielts Essay Samples Task 2 </h2> <p>Looking at IELTS article themes with answers is an astounding way to help you to prepare for the test. In case you're preparing for the IELTS exposition, you will realize exactly what I mean. It was difficult for us all in any case composing papers. Composing expositions become simpler and you will be significantly speedier as well. </p> <p>The same as an incredible specialist will be in a situation to help you fix a medical problem, a brilliant IELTS educator will be able to help you fix your particular difficulties. Concentrating hard is superb, however don't disregard to contemplate keen. It's basic that you have some phenomenal models so it is conceivable to analyze your composition and see whether you're on the correct way. </p> <p>Some people feel that self-teaching is the best decision, while some incline toward normal schools. A monetary help from the legislature will without a doubt be an enormous guide, a component which may swing the choice for a lot of people. A few people imagine that encouraging youngsters at home is perfect for a kid's turn of events while some accept that it's imperative to kids to go to class. Maybe it's even expanded worry that we've come to be so tolerating of this kind of oversight. </p> <p>Your composing likewise should be very simple to peruse and a ll components of it are overseen appropriately to have the option to ensure Coherence and Cohesion. You just ought to completely manage all areas of the undertaking. It will furnish you with thoughts and capacity to communicate. People should be mindful so as to belittle the value and intensity of information. </p>

A Deadly Mistake Uncovered on Research Paper Topics for Gender Studies and How to Avoid It

A Deadly Mistake Uncovered on Research Paper Topics for Gender Studies and How to Avoid It Research Paper Topics for Gender Studies Secrets That No One Else Knows About In the cutting edge society, sex implies a mess more than it used to. Despite the fact that it isn't as basic as may appear. In certain countries, a particular sexual orientation is essentially wanted to the next. The more fruitful sexual orientation will be brought up notwithstanding the explanations for their prosperity. For instance, an ace level research paper requests a specialist with no not exactly an ace or Ph.D. degree. Such a lively and dynamic field is probably going to make some great research questions. In the first place, you could purchase a sex and sexuality look into paper from them whose structure is fundamentally the same as your own one of a kind planned exposition. Endeavor to add new information to the examination territory by methods for your exploration. Instructions to Choose Research Paper To pics for Gender Studies The expense of an article is needy upon the aggregate sum of exertion the author needs to apply. Composing an examination paper despite the fact that may seem testing is a significant segment of ordinary understudy life. The gifted journalists move their collected information and methods towards improving the nature of your point and, at long last, paper. Consider composing with respect to your preferred enthusiasm. There's, plainly, a breaking point on the scope of pages even our absolute best journalists can create with a squeezing cutoff time, however generally, we can fulfill all the customers looking for dire help. You ought to have your reasons, and our chief concern is that you end up getting a superb evaluation. The paper should be dedicated to the elements for contrasts in installment that is given to people for the specific work done and gracefully potential arrangements. It ought to be a rundown of proposals how to build the quantity of females on the worldwide political field. As for experience, working with an individual who has chipped away at comparative papers implies they comprehend the necessities and rules. As understudy charges you have to pay 500 for every term. Building a cautious choice ensures that the exploration strategy isn't just enlightening yet additionally fulfilling. In the event that you're feeling severely arranged to choose a point, you could likewise make some troublesome memories setting up the proposition and delivering a great paper. The Argument About Research Paper Topics for Gender Studies The paper should concern the utilization of female pictures, along with sex issues for the most part, for the business purposes and advancing industrialist viewpoint. You can obtain your thoughts starting there. The goal of research paper in this control is to cover ebb and flow open issues, uncover significant parts of different difficulties, and, assuming there is any chance of this happening, offer ideal ar rangements. Correspondence and Gender inquire about papers look at how ladies and men convey in the business air. You may even discover fabulous instances of research paper points to assist you with limiting your choice. You ought to be sure to comprehend everything unmistakably once you decide on an article point. By breaking down a web investigate paper model, you can figure out how to draft your own theme. Making a legitimate research point isn't a stroll in the recreation center. Presenting Research Paper Topics for Gender Studies To verify that your paper doesn't segregate anybody, endeavor to envision that you're perusing it to the blended crowd of particular sexes. After you pick the theme, it's presently an ideal opportunity to discover increasingly about the paper. You get your subject and paper promptly and save time for some different exercises. Regardless of whether a particular research paper subject is getting a lot of buzz right now or different people appear to be ke en on expounding on it, don't feel enticed to make it your theme on the off chance that you don't truly have some kind of enthusiasm for it too. Whatever the case, it's quite often an awesome plan to discover help with mind boggling or fast research paper points. By investigating an elegantly composed instance of research proposition paper, you will discover that points which are too expansive can be hard to oversee as you will likely have extraordinary, and much of the time clashing, thoughts regarding how to handle the issue. There are events when you're doled out with the subject yet more habitually, you'll have to make a point all alone. You ought to likewise consider getting master help in the event that you do not have what it takes to explore and figure an enlightening and reasonable point without anyone else. The New Fuss About Research Paper Topics for Gender Studies What's an exploration paper. The more you understand the less complex it's for you to form a flourishing exploration paper. Now and again, extraordinary research paper subjects are only the least demanding ones. When choosing your exploration paper point , you need to make certain it is neither exhausting nor exhausted. Clearly, it doesn't show you will get a prepared arrangement for your paper. An explanatory research paper offers you an edge in your classes. As an approach to create a paper, you have to make an exploration question. Before you begin composing a solitary expression of your paper, you first should comprehend what your proposition will be. While talking about sexual orientation balance themes, it's imperative to adhere to specific principles not to mishandle a particular sort of perusers. You need to consider the related issues to flexibly the complete reaction to the article question. Without a doubt, you may have a specific point appointed to you. Not all exploration paper themes are made equivalent, and you might want to promise you pick an astonishing point before you begin composing. Along these lines, it's imperative to make them experience its various components to better their insight. Learning materials As individuals study, the right assortment of articles significantly hel ps the method. You can both use individual experience and spread new subtleties for you, contingent upon the examination of various writers and reaching your very own determinations. If it's not too much trouble recollect that individual experience is very basic in sex considers, it can give you a couple of bits of knowledge and lead you through the way of your examination, however by the by, it can't be the all around significant information. It is valuable even in the occasion the exploration is very like your own sentiments. An assessment of the impacts that fathers have on the development of their kids This investigation will help in drawing out a couple of the impacts that fathers have on the advancement of their youngsters. Inadequacy of time, nonattendance of thoughts, insufficiency of experience, and absence of inspiration are the chief explanation keeping understudies from making a particular research paper point for their humanism undertaking. PTSD and PTSS at work. One of the most troublesome errands for understudies is making up reasonable and instructive subjects. These points are intended to assist understudies with recognizing some accommodating sources. Along these lines, understudies who study industry and other related subjects might be keen on composing on some of the resulting points. General data Students that are new to the subject of social examinations should be prepared for inside and out training at their underlying exercises.

Senior Project Research Paper Writing

<h1>Senior Project Research Paper Writing</h1><p>Senior venture explore paper composing is a term that probably won't be recognizable to numerous individuals. Notwithstanding, it's a term that you will need to learn so as to be effective at the undertaking you have coming up. We should investigate what senior task explore paper composing is, the manner by which it's done, and what's in store when you experience the process.</p><p></p><p>Senior venture examine paper composing is composing a paper that will be very not the same as that of your friends. Rather than simply composing a paper on your preferred subject, you'll be composing an exploration paper and a troublesome one at that. Many individuals are imagining that senior undertaking research paper composing is a confusing expression, and that you can't compose an exploration paper on something you're not inspired by. In all actuality it isn't so hard to compose an undertaking that is ide ntified with what you're enthusiastic about, however to compose a task on something you're not is difficult.</p><p></p><p>The motivation behind why senior venture look into paper composing is so troublesome is on the grounds that there are such a large number of various points. On the off chance that you need to compose an examination paper on something you're generally intrigued by, similar to specific games, for instance, at that point you'll need to cover sports in a goal way. On the off chance that you need to compose a paper on something increasingly close to home, similar to a side interest or intrigue, you'll need to do that too. For this situation, your exploration must be as goal as could be expected under the circumstances, since the one thing that senior task look into paper composing is unquestionably not is subjective.</p><p></p><p>There are a great deal of research papers that you can compose that will require senior unde rtaking research paper composing, which is the reason you have to figure out how to do it. The most ideal approach to figure out how to do this is to take a gander at other people who are as of now doing it. Your most solid option is take a class or two about senior task examine paper composing at your college, or at home in case you're simply starting with the subject. Senior task investigate paper composing is nothing to get excessively energized about.</p><p></p><p>Take some an opportunity to compose an examination paper on your territory of premium. Try to break the point into littler subjects with the goal that you can benefit as much as possible from the constrained measure of time you have for composing. The issue with numerous individuals is that they'll compose their paper on a solitary theme. Notwithstanding, by separating it, you'll have the option to have a greater amount of an effect on the peruser, and make a surprisingly better research paper.& lt;/p><p></p><p>Even however senior undertaking research paper composing is a test, it's additionally fulfilling. You'll feel incredible about what you've done and can utilize that equivalent inclination to rouse you to keep gaining ground. It's difficult work yet exceptionally compensating when you're set. Also, when you're set, it'll furnish you with the evidence you need that you made the best choice in seeking after that pursuit.</p><p></p><p>Writing an exploration venture paper is something that anybody can do, and is something that individuals become known for when they start composing scholarly articles. It doesn't make a difference in the event that you need to be distributed or not, as long as you give it your everything. So feel free to do some examination on your zone of intrigue, at that point try to compose a senior undertaking research paper.</p>

Hong Kong and Chongqing Air Pollution

Air Pollution Observation between Hong Kong and Chongqing Part 1 General Picture of Hong Kong and Chongqing and Meaning of Comparing An entire host of similitudes between Hong Kong and Chongqing make this current proposal's intending to misuse air contamination and approaches governments take increasingly down to business and significant. Among the previously mentioned likenesses, the land ones could be treated as prowling reasons for air contamination and other relative issues. Consequently, this part is expected to exhibit a general outline of this part of things in common.The urban areas of Chongqing and Hong Kong are both situated at uneven regions that are exceptionally opulated, with structures and significant expressways found near slants and earth-holding structures. Avalanches and rockfalls are basic in the two urban communities, and huge consumptions are being acquired by the two Governments on the examination, structure and usage of relief and preventive measures to lessen the probability of the death toll and monetary misfortunes because of avalanches. Both Hong Kong and Chongqing have a sticky subtropical climate.Summer is blistering and sticky with infrequent showers and rainstorms, and warm air originating from the southwest. Summer is when storms are in all probability, here and there bringing about flooding or andslides. Winters are gentle and as a rule start radiant, getting cloudier towards February; the periodic virus front brings solid, cooling twists from the north. The most calm seasons are spring, which can be alterable, and harvest time, which is commonly radiant and dry. Hong Kong midpoints 1,948 hours of daylight for every year, while the most noteworthy and least at any point recorded temperatures at the Hong Kong Observatory are 36. oc (97. 0 OF) and 0. 0 oc (32. 0 OF), separately. Then again, known as one of the â€Å"Three Furnaces† of the Yangtze River, Chongqing has a rainstorm nfluenced moist subtropical atmosphere, and for a large portion of the year encounters muggy conditions. In addition, its summers are long and among the most sizzling and generally muggy in China, with highs of 33 to 34 oc (91 to 93 OF) in July and August in the urban territory. Winters are short and to some degree mellow, however sodden and cloudy. Since the city's area is in the Sichuan Basin, Chongqing has one of the most minimal yearly daylight nationally.The fgure is just 1,055 hours, which is a lot of lower than certain countries of Northern Europe. (Wikipedia: Chongqing) Chongqing is nearby upper east piece of Sichuan region, and the region of this city is more than 23,000 km2 with 5million populace. Chongqing is one of the most contaminated urban communities in China: from 1981 to 1996, S02 (Sulfur Dioxide) outflows were around 800,000 tons, and TSP (Total Suspended Particulates) emanations were around 200,000 tons for every year. The every day grouping of S02 came to 0. 26-0. 49mg/m3, which is 3-7 times higher than t he Class II national standard of air quality

Guidelines For Holocaust Essay Topics

Choosing Jane Eyre Essay Topics

<h1> Choosing Jane Eyre Essay Topics </h1> <h2> New Ideas Into Jane Eyre Essay Topics Never Before Revealed </h2> <p>Writing on a spot that wasn't unmistakably comprehended will most likely impact the standard of your paper. Our point is to consolidate quality with speed for the best paper understanding. At the end of the week, Jared states, I don't have whenever left for the total of research my educators are scanning for in an examination undertaking. Disregarding this fact, the desires that the general public has of both young ladies are amazingly comparable. </p> <p>We need each customer to be totally fulfilled each second. You can become familiar with the business or organization area, where this erotic badgering is normal. The perfect thing about our composing administration is you may give a whole depiction and get it composed precisely the bearing you require it. We spare you time each time you request from our administrations! </p> <p>Just investigate and see what may carry out the responsibility for you. You want a foundation to make something legitimate. Bodylanguage and signals state a decent arrangement. It's the best strategy to pick on the off chance that you might want to introduce the most grounded bit of proof at first or last. </p> <p>In the beginning of the novel you have the chance to discover more data about her adolescence. The film end up being a decent achievement. Portray the manner in which the hero creates through new periods of her life. Investigate the piece of the tutor in a standard family unit of the timeframe. </p> <h2>Jane Eyre Essay Topics - the Conspiracy </h2> <p>Moreover, Bridget's mom's key goal is to find a man for her little girl. For instance, Jane as a representative doesn't have any penny at Thornfield. The absence of family makes a blended impact in Jane. </p> <p>The one thing that is comparative among Rivers and Reeds is that they're a sibling and two sisters. Also, there's an exceptional arrangement of tension that is made by the vicious conduct of Bertha Mason. </p> <h2>Why Almost Everything You've Learned About Jane Eyre Essay Topics Is Wrong </h2> <p>Thus, by introducing numerous types of confirmations, you will be in a situation to demonstrate that ladies are more at the possibility of the erotic badgering. The inappropriate behavior can affect the casualties in different manners. For instance, the casualties can really feel the cerebral pain, strain and low confidence. Most of the casualties don't report against the crooks at the best possible second. </p> <p>This sort of paper will utilize great proof to exhibit the point that you are endeavoring to make regarding the novel. First-individual portrayal has the advantage of allowing the peruser to intently relate to the storyteller, in this o ccasion the hero. </p> <p>Even however you may not utilize all the sources you will find, read huge amounts of material so you can rapidly detail an article dependent on an amazing idea, with supporting proof. She shows the estimation of confidence. This production takes an account sort of narrating, when utilizing the absolute first individual voice. We verify that the examination is impeccable. </p> <h2> The Good, the Bad and Jane Eyre Essay Topics </h2> <p>Let's have a look at the huge subjects in a novel. An examination paper on Jane Eyre is easy to compose on the off chance that you pick a subject in an area you effectively comprehend. Be sure that you catch the realities since they show up in the book. </p> <p>When you're given explicit subject to compose on simply hold fast to the chief point and don't discuss different topics or don't start composing the review of the novel. Is anything but a subject that is simply tended to by ladies in writing, to be sure, however it's one that has all the earmarks of being used most suggestively by them. Despite the fact that the novel isn't hard to see yet its subjects and individual themes utilized make it difficult for understudies to manage Jane Eyre article. This customary novel is amazing for looking at numerous features of writing. </p>

Bevezets - Free Essay Example

1 BEVEZETS A kezdetektl rohamosan fejld szmtgpiparban folyamatosan szksg van arra, hogy az adatok s programok trolsra szolgl eszkzk (sszefoglal nven httrtrolk) is kvetni tudjk a szmtgpek tbbi elemnek (pl. processzor, memria) fejldsbl add megnvekedett ignyeket a trolkapacits nvekedse, s ezek teljestmnye (az adatokhoz val hozzfrs s az adatoknak az adathordozra trtn rsi sebessge) tern. Mindezt gy kell megvalstani, hogy a biztonsgot s a gazdasgossgot se ldozzk fel a fejlds oltrn.. Dolgozatomban a httrtrols, az ehhez szksges eszkzk ltrejttnek, s ezek fejldsnek bemutatsval klns tekintettel az elmlt 10 v fejlesztseire kvnok eljutni addig, hogy megprbljam megllaptani, hogy mi lehet a jvbeli fejlds irnya a PC-k beptett httrtrolinak s kls, hordozhat, cserlhet adathordozinak vonatkozsban. Az adattrols szksgessgnek s a digitlis adattrols mdjnak bemutatsval kezdve, az adattrolk fejldst a kezdetektl a jelen, s taln a jv trolsi technikinak bemutatsig, sorra vesszk a httrtrols fejldsi irnyait, eljutva a lyukkrtytl a holografikus trolig. Az idrendi sorrendben trtn bemutatson tl, mkdsi elvk/adathordoz anyaga szerint is osztlyozva mutatjuk be azokat az eszkzket, technolgikat, amelyek bevltottk a hozzjuk fztt remnyeket, s fejldsnek indultak, de bemutatjuk azokat is, amelyek klnfle de a legtbbszr nem technikai, technolgiai, hanem zletpolitikai okoknl fogva vakvgnynak bizonyultak. Mindekzben a manapsg legelterjedtebb mgneslemezes adattrolrl megprbljuk kiderteni, hogy technikai rtelemben van-e mg benne fejldsi lehetsg. Konkrtan arra keressk a vlaszt, hogy a teljestmnynvekedshez a technolgibl addan hozz tartoz a fordulatszm-nvekeds kvetkeztben fellp melegeds kordban tarthat-e az ismert htsi eljrsok segtsgvel, vagy esetleg ez lehet az, ami meggtolja ennek a technolginak a tovbbi fejldst. Mindezt a gyakorlatban elvgzett, mrsek segtsgvel prbljuk bizonytani (vagy cfolni). 2 A HTTRTROLK CSOPORTOSTSA A szmtgpes feldolgozs sorn elkerlhetetlen az adatok trolsa. Mivel a memria felejt trol vagyis a gp kikapcsolsakor a tartalma elvsz -, ezrt szksg van tarts trolsra alkalmas eszkzkre is. Ezt a cl szolgljk a httrtrolk. A httrtroln trolt adatokkal nem vgezhetnk mveleteket, valamint az ott trolt programok nem futtathatk. Hasznlatukhoz elbb be kell ket a memriba tlteni. A mai modern httrtrolk kialakulsa eltt az adatok beolvassa nem volt egyszer feladat. Azon kvl, hogy nem volt rm hasznlni ezeket pldul: lyukkrtya-olvas s streamer-, tbb nagyobb htrnyuk is volt. Pldul a processzor teljestmnyhez kpest a beolvassi sebessg rendkvl lass volt s a szalagok kzi cserje is nagyon idignyes. A kzponti egysg jobb kihasznlsnak rdekben merlt fel az igny nagyobb hatkonysg httrtrolra. [3] Vlemnyem szerint, ami a legnagyobb lpst jelentette az adattrols elrehaladsban az a technikai s a fizikai ismeretek bvlse, illetve az, hogy egyre tbb informcit kell trolni. Hiszen az adattrols elszr mechanikus formban jelent meg, radsul azok az adathordozk viszonylag rvid letek voltak. Mostansg pedig mr a mechanikai alkatrszek elektronikai ramkrkkel vannak sszedolgozva, amik sokkal preczebb mveleteket eredmnyeznek. Az ember viszont nem pihen. Mindig jobbra trekszik, gy az adattrolst is tkletesteni szeretn. Ennek fnyben a mai kor vvmnyaknt ltrehozta az SSD meghajtkat. Ezekben az eszkzkben mr nincs mozg alkatrsz, csakis flvezetk. Ennek ksznheten lecskken a felmerlhet hibk szma. Nincs, ami kikophatna, vagy megkarcoldhatna. Rviden sszefoglalva, amg az ember kpes lesz gondolkodni s pteni, addig az adattrolk is meg fognak julni. Egyik felfedezs sem fogja megmondani, hogy mi lesz a kvetkez generci kpviselje, csak utat mutathat fel. 3 A HTTRTROLK CSOPORTOSTSA A httrtrolkat tbb szempont szerint csoportosthatjuk. A csoportosts trtnhet pldul az adathordoz anyaga szerint. E szerint megklnbztethetnk papr, vagy manyag alap, mgneses rteggel elltott manyag vagy fm adathordozkat, illetve flvezet alap troleszkzket. De lehetsges mg a mkdsi elv szerint trtn besorols, miszerint beszlhetnk mechanikus, optikai, mgneses, vagy magneto-optikai elven mkd, illetve flash alap, vagy akr holografikus eljrst alkalmaz httrtrolkrl. Dolgozatomban a mkdsi elv s a kronolgiai sorrend szerinti csoportostst vlaszto t tam . 3.1 A papr, vagy manyag alap httrtrak A papr, vagy manyag alap httrtrak kz soroljuk a lyukkrtyt s utdt, a lyukszalagot. Ezek voltak az els adathordozk, melyeket ma mr nem alkalmaznak, hiszen feldolgozsuk lass, kezelsk krlmnyes, knnyen srlhetnek, valamint nagy tmeg s mennyisg alapanyagot ignyelnek. Egyetlen elnyk, hogy olyan krnyezetben is alkalmazhatk, ahol a mgneses adathordozk nem. 3.1.1 Lyukkrtya A lyukkrtya, vagy Hollerith-krtya olyan adathordoz, elsdlegesen adatbeviteli eszkz, ahol a digitlis informcit a kemnypaprbl kszlt krtyn adott pozciban meglev lyukakkal brzoljk. Lyukkrtykat s ehhez hasonl rendszereket mr a 18. szzad kzepn hasznltak az automatizls s az adatfeldolgozs terletn. Az egyeslt llamokbeli npszmlls adatainak feldolgozshoz az IBM alaptja, Hermann Hollerith hasznlt lyukkrtykat elszr. Tbbnyire az ismtld folyamatok vezrlse volt a cljuk. Lteztek pldul lyukkrtya-vezrls szvszkek, ahol a lyukkrtyt falapok jelentettk. 1. bra: A Jaquard-fle szvszk lyukkrtyi 2. bra: COBOL-program egyik utastst tartalmaz lyukkrtya Mkdse: A lyukkrtyk lyukasztsra egy krtyalyukaszt szolglt, de ksztettek kzi lyukasztsra szolgl egyszer krtyalyukasztkat is. Miutn a krtyalyukasztval rvittk a kdot a krtykra, a krtykat egy msodik gpen ellenriztk. A msodik gpen jbl bevittk az adatokat, s ha a msodik bevitel egyezett a krtyn mr meglv lyukasztsokkal, akkor a krtyt a gp ellenrzttknt jellte meg. A programkrtya ami a krtyalyukaszt egyik rsze a munka megknnytsre szolglt. Ennek segtsgvel pldul numerikus, vagy alfanumerikus mezket is meg lehetett hatrozni a krtyn, s ezekhez a mezkhz kzvetlenl lehetett ugrani. Az jabb kszlkek arra is alkalmasak voltak, hogy a lyukkrtya adattartalmt szvegesen is megjelentsk a krtyn. A lyukkrtynak a szmtgpek ltrejttben fontos szerepe volt. Az orszg els jelfogs szmtgpnek, MESz-1 (MEgyetemi Szmtgp) programjait lyukkrtykon troltk. A gp rendszert, architektrjt, mveletvgzsi, valamint vezrlrendszert Kozma Lszl fejlesztette ki. A gp tervezse s ptse 1955-ben kezddtt el. 1958-tl kzel 10 ven keresztl hasznltk elssorban az oktatsban, de klnfle ipari feladatok kiszmtsra is alkalmaztk. 3. bra: MESz-1 Az 1960-as vektl kezdden a mgnesszalagok bevezetsvel a lyukkrtya fokozatosan vesztett szmtstechnikai jelentsgbl. Az 1960-as vek vgn az IBM mg tervezte kisebb mret s nagyobb kapacits krtyk bevezetst, de erre mr nem kerlt sor. Az 1980-as vekre mr alkalmatlann vlt a szmtgpes adatok trolsra. 3.1.2 A lyukkrtykat azonban tovbbra is alkalmaztk ms terleteken, pldul mosgpek programjainak trolsra, illetve belptet krtyaknt. Ezekben az esetekben azonban a krtya nem kartonpaprbl, hanem vkony manyaglapbl kszlt. A chipkrtya elterjedse azonban ennek a felhasznlsi mdnak is vget vetett. Hollerith-krtykat nhny mechanikus blokkolrnl mg hasznlnak. [4] 3.1.4 Lyukszalag A lyukszalag a korai nagyszmtgpek adattrol eszkze volt. Elnye volt, hogy a trolsi hmrskletre s a krnyezetre nem volt knyes. Lasssga, s alacsony trolkpessge miatt elavult, s szerept tvettk a mgneses adattrol eszkzk. Robosztussga miatt mg sokig alkalmaztk a gpiparban, NC s CNC szerszmgpeken adatok bevitelre, mivel a poros s olajos krnyezetet viszonylag jl brta. A lyukszalag viszonylag ers paprbl, vagy manyagbl kszlt csk, amelyre az adat lyukasztssal kerl fel. 4. bra: Lyukszalag Mkdse: A lyukszalagolvas mechanikusan, vagy optikailag rzkeli a szalagon tallhat lyukakat, s azokat binris rtkknt rtelmezi. A lyukszalagon a lyukak hosszanti irny sorokban helyezkedtek el, ezek szmnak megfelelen beszlnk 5-8 csatorns lyukszalagokrl. Az informcit hordoz lyukak kztt egy aprbb lyuksor is tallhat, mely a mechanikus szalagolvask esetben a szalag tovbbtst segti. A szalagot a kisebb lyuksorba kapaszkod specilis fogaskerk vitte elre. [5] rdemes megemlteni, hogy az M-3-nl (az els magyar teljesen elektronikus szmtgp) az adatok bevitelre lyukszalagolvast mint kls memrit hasznltak. Az M3 1957 sztl 1959 vgig plt, de fejlesztse ezutn is sok feladatot adott. Az M-3 nagy hatssal volt a tudomnyos s gazdasgi letre. 1968-ban megsemmistettk, csupn nhny dob s alegysg maradt meg belle. A M-3 operatv tra elszr egy mgnesdob-memria volt, kezdetben 1 ksz kapacitssal (1 sz 31 bit), majd tovbbfejlesztettk 1,6 kszra. 1960-ban j mgnesdob vezrl egysg plt, ami ngy folyamatosan cmzett mgnesdobot tudott a gphez csatolni. Ksbb, a ferritmemria (1 ksz kapacits tr) megrkezse s illesztse utn a dobok httrmemriaknt mkdtek. 5. bra: Az M-3 mgnesdob memrija 3.2 A mgneses adathordozk A lyukkrtya s lyukszalag httrbe szorulsval eltrbe kerlt a mgneses adattrolkra trtn rgzts. Kt jellemz tpusa a szalagos s a lemezes. A szalagos trolk soros elrs trolk, ami azt jelenti, hogy egy bizonyos adat megkeresshez az sszes eltte lv adaton vgig kell haladni. A mgneslemezes tr elnye, hogy a szalaggal ellenttben nem nylik, gy biztonsgosabban lehet megkeresni a kvnt informci helyt. Kzvetlen elrs trol, teht nem kell egyszerre az sszes adatot kiolvasni, hanem egyes rszeit is el lehet rni. Jellemzik: a trolhat adatmennyisg nagysga (kapacits), a sebessge (gyorsasga), azaz mekkora az adat-hozzfrsi id, valamint az adatsrsg nagysga. Tbb fajtja ltezik, amelyek trolsi kapacitsban s biztonsgban egyarnt klnbznek egymstl. Mieltt belekezdenk a mgnesszalagos trolk ismertetetsbe, nhny mondatban szeretnm bemutatni az M-3 kapcsn mr emltett mgnesdobos trolt. Ezt a trolt digitlis szmtgpekben hasznltk. Az els mgnesdobos trolt 1949-ben ksztettk el 1024 sz kapacitssal. A mgnesdob trolban a mgneses rteg egy henger felletn helyezkedik el. Az informcit krgyr alak, vagy a henger alkotjval prhuzamos svon jegyzik fel. Az r- s olvasfejeket a henger alkotjval (a forgstengellyel) prhuzamosan rgztik. Az informci szervezse soros, vagy prhuzamos. Soros szervezs esetn az egymshoz tartoz bitek egy-egy krgyr mentn helyezkednek el s az ll r/olvasfejekhez gy egyms utn sorosan jutnak. Prhuzamos szervezsnl az egymshoz taroz bitek a henger egy alkotja mentn helyezkednek el, gy az ll r/olvas fejekhez egyszerre jutnak (prhuzamos zem). A mgnesdob trolk jelentsge a mgneslemez s mgnesszalag trolknl kisebb. 3.2.1 Mgnesszalagos trol (streamer) A mgnesszalag (magnetic tape) egy szles, mgneses fellet manyag szalag. Az egyik legrgebbi msodlagos troleszkz, amelyik kinzetben s trolsi elvben hasonl a kznsges magnszalagokhoz, de lnyeges klnbsg, hogy analg jelrgzts helyett digitlis rgztst hasznl. 6. bra: Mgnesszalag A mgnesszalagok, mint szmtgpes httrtrak mkdst brmelyik 70-es vekbeli Colombo filmen lehet ltni. Akkor ezeken a szalagokon nagyon nagy mennyisg adatot lehetett trolni. (Ez akkor kb.: 108 bit volt, ami durvn 10 MBjt). Ma mr tbb szz GBjt adatot is lehet rajtuk trolni. Mgnesszalagnl az adatok lland mret blokkokban helyezkednek el, melyeket res rszek (gap-ek) vlasztanak el egymstl. A szalag elejn s vgn adattrolsra nem hasznlt befz rszek tallhatak. A szalag vgt alumniumcsk jelzi. Mgnesszalag trat mikroszmtgpek mellet nem hasznlnak, legfeljebb egyszerbb szemlyi szmtgpeknl (PC) kazetta formjban. Mikroszmtgpes krnyezetben a mgnesszalag egyetlen alkalmazsi terlete az adatllomnyok archivlsra szolgl eszkz (streamer) adathordozjaknt funkcionl. rdekessgknt megemltenm, hogy az IBM j rekordot lltott be a mgnesszalagok kapacitsban: nem kevesebb, mint 35 TB-nyi adat rgzthet a szintn j fejleszts mgnesszalagjukkal elltott kazettra. Az j szalag egy ngyzethvelyknyi (6,45 ngyzetcentimter) felletn 29,5 millird bitet tudnak eltrolni, 39-szeresen fellmlva gy a mgnesszalagos megolds eddigi legjobb lehetsgeit. A mgnesszalagos egysgek (streamer, adatramoltat) az adatok, programok trolsra hasznlatosak a szmtstechnikban. A merevlemezeken lev fjlokat, adatokat, programokat kzvetlenl el tudjuk rni a szmtgprl, ellenttben a szalagokkal, ahonnan ltalban csak a diszkre trtn visszatlts utn hasznlhatk az informcik. A mgnesszalag kazettban van elhelyezve, a magnkazetthoz hasonl mdon. A mgnesszalagos meghajt lehet kls egysg, de bele is pthet a szmtgpbe, a szabvnyos helyre. 7. bra: Mgnesszalagos egysg A mgnesszalag-egysg (meghajt) f funkcii: * Blokk rsa, * olvassa, * trlse, * a szalag mozgatsa. * A mgnesszalagot orsk mozgatjk az r-olvas fejek eltt. A tovbbts irnytl fggen, a kilyuggatott orsk egyikre rszvjk, a msikon leveg kifjssal ltrehozott lgprnn cssztatjk. * A nagy sebessg elrshez a szalagot az orsk mellett vkuumkamrkba szvjk. * 8. bra: Mgnesszalag mkdse rdemes megemlteni a DAT[1]-meghajtkat. Ezek szintn mgnesszalagot hasznlnak a trolshoz, de kapacitsuk jelentsebb, mivel tls svfelvitelt valstanak meg. 9. bra: DAT kazetta A mgnesszalagos trols a mai napig korszernek szmt a szmtstechnikban s a szrakoztatiparban egyarnt. Igaz, nem a jl ismert analg, hanem a digitlis vltozat. Ezek a mgnesszalagos kazettk tbb Gbyte informcit is tudnak trolni. Igaz, hogy soros elrsek, teht csak a felrs sorrendjben lehet az adatokat visszaolvasni. ppen ezrt inkbb hossz tv archivlsra, illetve a srlkenyebb adattrolkon trolt informci biztonsgi msolatra hasznljk. A szrakoztatiparban elssorban a DAT-kazettkat hasznljk. Ezek digitalizljk a hanganyagot, s ezltal lehetv teszik, hogy a szoksos analg magnval ellenttben ne njn minden egyes felvtelkor, vagy msolskor a hangminsget ront zaj erssge, hanem ksbb is ugyanolyan tiszta maradjon a felvtel. Ennek legfkppen a rdimsorok ksztsekor van nagy jelentsge. Egy ilyen kazettra akr tbb rnyi msort is rgzthetnk, s ezt brmikor le is jtszhatjuk anlkl, hogy a minsg romlstl kellene tartanunk. 3.2.2 Hajlkonylemez s hHajlkonylemezes (floppy) meghajt Az IBM 1971-ben vezette be a mgneslemezes trolst. A hajlkonylemezek hajlkonylemezek (floppy disk, FD) voltak az els hordozhat, mgneses elven mkd adathordozk. Pr mondat erejig kitrnk Jnosi Marcellra, aki a 3,5-os floppy snek, a 3-os kazetts hajlkonylemeznek a feltallja. A hajlkonylemezt a Budapesti Rditechnikai Gyrban (BRG) fejlesztette ki. Akkoriban trolegysgknt elterjedt volt a 8-os paprtasakos hajlkonylemez. Jnosinak az az tlete tmadt, hogy az alkalmazott lemezeket is el lehetne helyezni a magnszalagok kazettihoz hasonl merev kazettban. A szabadalom 1974-ben kerlt bejegyzsre. A tallmny hrre a korszak legmeghatrozbb cgei s emberei jttek trgyalni, de a BRG megtiltott mindenfle trgyalst, mert a szocialista orszgok akkori egysges szmtgpes rendszerben nem lehetett az imperialista vilg rendelkezsre bocstani ily szellemi termket. A prbagyrts az risi nemzetkzi rdekldst ltva is csak jval ksbb, 1981-ben kezddtt MCD-1-es nven. A nhny ezer legyrtott pldnyt Nmetorszgban szereltk be az akkor ppen megjelen mikrogpekbe. Az MCD-1-et a feltall krse ellenre nem gyrtottk, s nem is adtk el. A szabadalmi djat nem fizettk, gy ettl kezdve Jnosi Marcell alkotst mindenki szabadon felhasznlhatta. Elsknt az amerikai IBM rdekldtt a floppy utn, s ksbb ksztettek egy, a Jnosinl nagyobbat, egy 8inch-est. A japnok is kvncsiak voltak r, majd el is ksz tettk a Jnosira leginkbb hasonlt floppyt. 10. bra: A BRG-ben gyrtott MCD-1 kazetts floppy Rgen mg a szmtgpekben nem voltak ltalnosan elterjedt merevlemezes meghajtk (winchesterek) -, ezekre a kiskapacits adathordozkra plt a szmtgpes adattrols. Mi sem bizonytja ezt jobban, mint az els szleskrben elterjedt, PC-re kszlt opercis rendszer a DOS, aminek mr a neve (Disk Operating System) is utal arra, hogy egy lemezes opercis rendszerrel van dolgunk. Lemezek tbb mretben kszltek, a legelterjedtebbek a 8, 5,25 s 3,5 collos (hvelykes) mretek voltak. 11. bra: 8, 5,25 s 3,5 floppy Mkdse: Az informcit egy mgnesezhet rteggel elltott kr alak lemezen troljuk. Az adatok a mgneslemezen koncentrikus gyrkn svokon troldnak. Ha az r-olvas fejet a kivlasztott svra lltjuk, az informci leolvashat. Ezek a krk annak ellenre, hogy befel haladva egyre kisebb a kerletk, mgis ugyanannyi bitnyi informcit trolnak. Ez gy lehetsges, hogy a kls krk mentn nincs kihasznlva teljesen a trolkpessg, azonban a lemez hasznlata szempontjbl ez az egyszerbb megolds. A lemezek formzsa, rsa s olvassa az r-olvas fejek segtsgvel trtnik. Ezek a forg lemezzel nem rintkeznek, hanem a forgs kzben kialakult lgprnn futnak. Olvasskor a fellet mgneses llapotait rzkelik, rskor pedig megvltoztatjk azokat. A csak sugrirnyban mozg r-olvas fejet lptetmotor helyezi a kivlasztott sv fl. 12. bra: A floppy felptse A lemezt manyag burkolat vdi a krnyezeti rtalmak (por, mechanikai hatsok stb.) ellen, megbontsa vagy eltvoltsa utn a lemez nem hasznlhat. A hajlkonylemez hasznlathoz szksg van egy be-, illetve kiviteli egysgre, a hajlkonylemez-meghajtra (FDD, floppy disk drive). 13. bra: Floppy-meghajt Tpusai: Az adathordoz korong kls tmrje s kapacitsa alapjn a kvetkez tpusok klnbztethetk meg: A korai, 8 inch-es meghajtk mreteik miatt mg kls egysgek voltak. A lemezek kapacitsa tpustl fggen 160-500 kB volt. 5,25 inch (1 inch = 2,54 cm) tmrj lemez, melybl kt klnbz kapacits tpus ltezik. Ezeket a kvetkez jelzsekkel klnbztetik meg: o Az SS SD (SS: egyoldalas; SD: szimpla srsg) tpusjelzs lemez kapacitsa: 128 kB. o A DS DD (DS: ktoldalas; DD: dupla rssrsg) tpusjelzs lemez kapacitsa: 360 kB. o A DS HD (DS: ktoldalas; HD: magas rssrsg) tpusjelzs lemez kapacitsa: 1,2 MB. 3,5 inch (1 inch = 2,54 cm) tmrj lemez, melybl kt klnbz kapacits tpus ltezik. Ezeket a kvetkez jelzsekkel klnbztetik meg o A DS DD (DS: ktoldalas; DD: dupla rssrsg) tpusjelzs lemez kapacitsa: 720 kB. o A DS HD (DS: ktoldalas; HD: magas rssrsg) tpusjelzs lemez kapacitsa: 1,44 MB. o A DS ED (DS: ktoldalas; HD: extra rssrsg) tpusjelzs lemez kapacitsa: 2,88 MB. [6] A hajlkony mgneslemezek veszlyei A mgneslemezek nagy hibja, hogy az r/olvas fej, amibl oldalanknt egy tallhat a meghajtban, menet kzben hozzr a lemez fellethez. Ha ez hozz is nyomdik valamilyen mechanikai hiba miatt, akkor a felletet knnyen sszekarcolhatja, eltntetve rla az adathordoz rteget, s vele persze az adatokat is. Ha por rakdik a lemezre, s gy rakjuk be a meghajtba, akkor az r/olvas fejek a port vgighurcoljk a lemez felletn, s ezzel sszekarcoljk azt. Persze a nem megfelel trols sorn is karcoldhat a fellet, hatalmas adatvesztst okozva ezzel. Ha a rendszeradatokat trol szektorok srlnek, akkor az egsz lemez hasznlhatatlann vlhat, mivel itt troldnak azok az informcik, hogy a lemez hny svra, s egy sv hny szektorra van osztva. Ennek ismerete nlkl pedig a lemez hasznlhatatlan. Amennyiben a lemez ms rsze srlt, akkor a rajta lev adatok egy rsze mg megmenthet, azonban elg kockzatos tovbb hasznlni a lemezt, ezrt inkbb el kell dobni. Elfordulhat az is, hogy a lemezhibt mgneses zavar okozza. Ez eredhet abbl is, hogy ers mgneses trben tartottuk a lemezt, s az tmgnesezte az adathordoz rteget, de magtl is megvltozhat egy elregedett lemez mgnesezettsge. Ezt a hibt ltalban egy jraformzssal meg lehet szntetni, de ha a lemez elregedse volt az oka, akkor jra jelentkezni fog a hiba. Ekkor szintn inkbb dobjuk ki a lemezt. Ezekbl jl lthat, hogy ma mr nem nevezhet biztonsgos adattrolnak a hajlkony mgneslemez. Srlkeny adathordoz, kis kapacits, lass adathozzfrs, nagyon rvid lettartam jellemzi; inkbb csak rvid tv trolsra (volt) clszer hasznlni, pldul kt, egymstl fggetlen szmtgp kztti adatcserre. 3.2.3 Zip drive A zip drive ttrst jelentett a floppys adattrolsban 1994-ben a maga 100 MB, majd 250 MB, s vgl 750 MB kapacitsval. Elterjedsnek gtja, hogy a hagyomnyos floppyval nem volt kompatibilis, s magas volt az ra. Inkbb kiscgek hasznltk adataik napi archivlsra. 14. bra: Zip drive A ZIP meghajtban az adathordoz olyan nagy sebessggel (kb. 3000 ford./perc) forog, hogy lgprna alakul ki a lemez s az r/olvas fej kztt. Megoldand viszont a lemez stabilitsa, hiszen a hajlkonylemez ilyen fordulaton berezeghet, vagy thet. Az adathordozt a ZIP kazettban mechanikusan rgztik, s a rugn nyugv fej csak egy kb. 1,2 mm szles rsen t fr a lemezhez. A fej pontos megvezetshez maga az adathordoz szolgl informcival. A hasznos svinformci kz ugyanis gyrilag szervoinformcit rgztenek. Minden fordulat sorn a meghajt 120-szor beolvassa a szervoinformcit, s ezzel vezrli az r/olvas fejet. A szervoinformcit nem szabad megvltoztatni. Ha az adathordoz ers mgneses trbe kerl, nem csak a felrt adatok vesznek el, hanem a szervoinformci is megsrl, s a lemez adattrolsra tbb nem hasznlhat. [7] 3.2.4 SuperDisk SuperDisk (LS 120, A:Drive): a 3,5-os floppyval azonos mret, 120 MB-os floppylemez az adatok trolsra. Tervezi szndka szerint ez az eszkz a PC-s vilgban is alkalmas lett volna a szoksos floppylemezek felvltsra. A tapasztalat szerint azonban fokozottan rzkeny a kls hatsokra, s viszonylag lass, ezrt szles krben nem terjedt el. [8] 15. bra: SuperDisk meghajt 16. bra: SuperDisk lemez 3.2.5 Merevlemezes egysg A technika fejldsvel egyre korltozottabbnak tntek a cserlhet mgneslemezek kapacitsai, ezrt megjelentek a szmtgpekbe fixen beptett merevlemezes egysgek, amelyeket ms nven szoks winchesternek8, vagy hard disk-nek (HDD) is nevezni. A winchester nv az IBM 1973-ban piacra dobott 3340-es tpus merevlemeznek volt a kdneve. 1988-ban a Conner gyrtotta le az els 1 magas 3,5-os merevlemezt, a mai asztali gpekben is gyakorlatilag ezeket a fizikai mret meghajtkat hasznljuk. Mieltt tovbbmennk, pr mondatban kitrnk a RAMAC-ra, a merevlemezek sre. A RAMAC-ot 1956. szeptember 13-n mutattk be az IBM kutati. Ez a kszlk akkor irtzatos mennyisg, azaz 5 megabjtnyi adatot volt kpes eltrolni a 15 darab, hatalmas 24 hvelykes tnyrjn. Az adatokat egy mechanikus karon mozg r-olvasfej kezelte, mely nem csak a lemezek sugrirnyban, hanem az egyes lemezek kztt, fgglegesen is mozoghatott. Az adatok elkeresse gyors volt, a szksges svra 1 msodpercen bell kpes volt odatallni az olvasfej, fggetlenl attl, melyik lemezen foglalt helyet. A RAMAC risi elnye volt az azonnali, vletlenszer hozzfrs, mely a lineris rendszer lyuk- s mgnesszalagok, krtyk korban elkpzelhetetlen sebessg adatelrst nyjtott. HDD 17. bra: RAMAC A merevlemezek mkdse: Itt egy, vagy tbb merev fmlemezre viszik fel a mgnesezhet rteget. A lemezek formzsa, rsa s olvassa az r-olvas fejek segtsgvel trtnik. A lemez lland fordulatszmmal forogva halad el a fej eltt, gy, hogy fizikailag nem rintkezik vele. Olvasskor a fellet mgneses llapotait rzkelik, rskor pedig megvltoztatjk azokat. A csak sugrirnyban mozg r-olvas fejeket lptetmotor helyezi a kivlasztott cilinder fl. A lemez forgsbl szrmaz lgmozgs felhajtert gyakorol a fejre, a fejet pedig torzis rug nyomja a lemez fel. A kt er kiegyenltdse kvetkeztben a fej a lemez fellettl mrt nhny tized mikromterre repl. Az adatok trolsa technikailag megegyezik a hajlkony lemezvel (svok s szektorok tallhatk a lemezen), a klnbsg a svok s szektorok szmban, valamint a bitek srsgben van. A nagyobb adatsrsget az biztostja, hogy az egsz berendezs a lemezekkel, s a kztk lev r/olvas fejekkel egytt egy pormentes, lgritka trben tallhat. [9] 18. bra: A merevlemez felptse A nagy mretnagymret optikai lemezek, a flash memrik, illetve a hordozhat, kls HDD-k megjelensig elterjedt volt a cserlhet fikokba (mobile rack) helyezhet hagyomnyos merevlemezek hasznlata. 19. bra: Mobile rack 20. bra: USB-s HDD 3.2.6 Az USB csatlakozk terjedsvel megjelentek az USB-s HDD-k is. Ezek mretkben kisebbek, viszont kapacitsuk szinte azonos a bepthetkkel. Praktikus zletembereknek, akik egsz nap laptoppal jrnak-kelnek, s a gp trhely kapacitst kinttk, vagy szemlyes informcikat nem akarnak trolni a cges eszkzn, viszont j, ha kznl vannak ezek a dokumentumok. De ajnlom brkinek, akiknek nem elg egy 32, vagy 64GB-os pendrive. Az USB-s HDD-nek nagyobb a feszltsg ignye, mint egy egyszer pendrive-nak, ezrt kt USB kbellel oldottk meg a szakemberek ezt a problmt. Az egyik kbelen az adatcsere s a feszltsg megy t, a msikon viszont csak a feszltsg. 3.2.8 A merevlemezes trak veszlyei A merevlemezes traknl egy, vagy tbb merev fmlemezre viszik fel a mgnesezhet rteget. A nagyobb adatsrsget az biztostja, hogy az egsz berendezs a lemezekkel s a kztk lev r/olvas fejekkel egytt egy pormentes, lgritka trben tallhat. A Bernoulli-trvnyt kihasznlva a gyorsan forg lemezek kztt a lgritka trben keletkez nyomsviszonyok a lemez fellete fltt pr mikronnyi tvolsgban lebegtetik a fejeket. Ebbl azonban kt veszlyhelyzet is addik. Az egyik veszly akkor addik, hogyha valamilyen ok miatt megsznik a fejek lebegse. Pldul a szmtgp kikapcsolsakor, a lemezek megllsakor kvetkezik ez be. Ha mr nem elg nagy a lemezek forgsi sebessge a fejek lebegtetshez, akkor azok resnek a lemez felletre, s sszekarcoljk azt. Ha ez olyan helyen kvetkezik be, ahol a lemezen adat tallhat, akkor azok az adatok a mgnesezhet rteggel egytt rkre elvesznek. Ennek elkerlse rdekben vagy legkvl, vagy legbell minden merevlemezen tallhat egy olyan terlet, ahol nincs mgnesezhet rteg. Kikapcsolskor a fejeknek ezen a terleten kell lennik, s itt is kell maradniuk a kvetkez bekapcsols utn mindaddig, amg a lemezek el nem rik az zemi fordulatszmot. Ezt a terletet nevezzk parkolplynak. A modern merevlemezes trolkban egy mechanika mr gondoskodik arrl, hogy h a az eszkz nem kap ramot, akkor a fejek azonnal a parkolplyra kerljenek, gy mire a lebegtet hats megsznik, a lemez mr biztonsgban lesz. A msik veszly, ha valami porszem bekerl az amgy pormentes trbe. Ha egyetlen porszem is beakad a fejek, s a lemez fellete kz, akkor az tnkreteheti az egsz lemezfelletet. [21] rdemes nhny szt ejtennk a merevlemezek adatsrsgrl (rssrsgrl), hiszen ez nagyban befolysolja a trolkapacitst, mretet, rat, s nem utols sorban a teljestmnyt is. A merevlemezek adatsrsge kt tnyeztl fgg: Svsrsg: azt mutatja meg, hogy colonknt (2,54 cm) hny sv tallhat meg a lemezen (TPI Track Per Inch), Lineris srsg: a sv adott hosszn eltrolt adatbitek szmt mutatja. Mindkt tnyez attl fgg, hogy egy adatbitet mekkora mret folt kpvisel a lemezen. Ezen foltok mrete a merevlemezek fejldsvel folyamatosan cskkent. Az adatsrsg nvelsvel egy bizonyos hatron tl az adatbiteket trol foltok mgneses llapotnak megvltoztatshoz olyan kis energia is elegend lesz, amelyet a folt a krnyezeti hbl is fel tud venni. Ekkor a foltok llapota instabill vlik, s a technolgia alkalmatlann vlik az adattrolsra. Ezt a jelensget szuperparamgneses effektusnak, illetve hatrnak nevezik, s elkpzelhet, hogy ezt a technolgiai hatrt hamarosan elrik a gyrtk. Az is lehetsges azonban, hogy mg sokig cskkenhet a foltok mrete, mire a technolgia elri ezt a hatrt, mivel nem lehet pontosan tudni, hol is van valjban. (Megjelent mr 2,5 inches, vagyis mobil eszkzkbe sznt, 2db egyenknt 320GB-os tnyrral elltott 640 GB-os meghajt is, amely 507 Gb/ngyzethvelykes adatsrsggel bszklkedhet. Ez a korbbi 394 Gb/ngyzethvelykes rtkhez kpest igen nagy elrelpsnek nevezhet.) [https://ipon.hu/hir/640_gb_os_mobil_merevlemez_a_seagate_tol/10319] 3.3 Az optikai elven mkd adathordozk A digitlis adattrols jelenleg egyik legelterjedtebb mdja az optikai trols. Az optikai lemezek manyag lapban ltrehozott bemlyedseket, lyukakat tartalmaz korongok, melyeket a srlstl val vdelem kedvrt egy msodik manyag rteggel vontak be. Az optikai adattrol rendszereket a hatvanas vekben kezdtk kifejleszteni. Clok: kpek nagy adatsrsg eszkzn trtn rgztse, amelyrl ksbb optikai ton azok leolvashatk, valamint, hogy az informcisrsg legalbb akkora legyen, mint az akkor ismert legnagyobb mgneses adattrol srsge. A 80-as vek elejn felmerlt az, hogy ltrehoznak egy olyan adathordozt, amely a korbbi, mgneses elven mkd adathordozk problmit (pldul: a szalag nylsa, s az ebbl add futs-egyenetlensg; a hre s mgnesessgre val nagymrtk rzkenysg; kevss biztos adattrolsi biztonsg; nagy trfogat; kis kapacits s viszonylagosan lass adatelrsi sebessg) kvnta kikszblni. Az optikai adattrol rendszerekre jellemz, hogy az rs s olvass lzersugrral trtnik. Mkdsi elv: Az optikai trol felletn az adatok rgztsekor kis mret mlyedseket hozunk ltre, amelyeken a leolvasskor a lzersugr sztszrdik, mg azadathordoz rteg eredeti felletrl visszaverdik. A mdium olvassakor a visszavert fnyt rzkeljk, s alaktjuk vissza adatokk. Az optikai trolkat tbb tulajdonsguk marknsan megklnbzteti a mgneses trolsi technolgitl: az optikai trolkra nagy trolsi srsg jellemz. Ennek oka, hogy a fny sokkal kisebb felletre fkuszlhat, mint a mgneses trolk elemi trol fellete. [12] Az optikai trolk alatt ltalban a CD-k s DVD-k klnbz tpusait rtjk. Ezek alkalmasak multimdis alkalmazsok, nagymret programok trolsra, valamint archivlsra is. 3.3.1 CD A CD-hanglemez az 1980-as vekben jelent meg, s igen gyorsan el is terjedt a digitlis hangtechnika vilgban. A Sony, s a Philips cg 1980-ban, kzs fejleszts utn dobta piacra. Compact Disc kompakt-lemez, vagy fnylemez; optikai elvek alapjn mkd, tetszleges hozzfrs troleszkz. Ez volt az els optikai elven mkd adattrol. Gyrilag prselssel lltjk el, tetszleges adatot tartalmazhat; archivlt dokumentumok, kpek, mdostst nem ignyl programok trolsra idelis. A CD manyag lemezen alumnium, vagy arany fnyvisszaver rteg helyezkedik el, ezen sorjznak a bitek (vilgos vagy sttebb mlyedsek, pit-ek). Az adat leolvassa lzerfnnyel trtnik, a visszaverd szrt fnyt mrik: a stt pontokrl kevesebb fny verdik vissza. Az adatok a lemez kzeptl kifel spirlszeren helyezkednek el. Az adatok leolvasshoz infravrs lzert hasznlnak. A lemez kapacitsa 640-900 MB. 21. bra: Egy CD lemez als, rott oldala A CD-ROM meghajt Az eltr forrs szabvnyos mret lemezeket fogad CD-meghajt a lemezt lland lineris, vagy lland szgsebessggel forgatja. A meghajt fkuszlt lzerfeje nagy pontossggal kveti a lemezre rt spirlis svot. A lemezt egy motorikusan mozgathat tlca hzza a hordozkereten bell tallhat optikai rendszer fl. Az optikai rendszer elsdleges feladata a CD-n trolt lyuk informci digitlis jelekk alaktsa. Legalbb ennyire fontos, hogy a fej a spirlis kanyarod felrst pontosan kvesse. Az adatok kiolvassa a polikarbont hordozrteg fell trtnik a lzerdida fkuszlt fnynek segtsgvel, bellrl kifel halad spirlvonal mentn. A digitlis adatokat a pitek s a kztk helyezked sk terletek, a landok adjk meg. A lemez letapogatsa a fnyinterferencia jelensgn alapul. A lzerdida lland hullmhosszsg fnye letapogatja a tkrz bevonattal elltott pitrendszert. A letapogat nyalb a land-rl visszaverdik, ez digitlisan 1 jelet jelent. A fnynyalb visszaverdse a pit-rl mr ellenkez fzisban trtnik, a visszavert fny intenzitsa alacsonyabb, ez lesz a digit lis 0 jel. 22. bra: A CD-ROM meghajt optikja A CD lemez fajti: A CD-k fizikai felptsk szerint kt csoportba sorolhatk. A felhasznl ltal szabadon, egyszer, vagy tbbszr rhat CD-re, illetve a felhasznl ltal csak olvashat CD-kre. CD-ROM[2]: csak olvashat. Gyrilag prselssel lltjk el, s gyrtsuk sorn rjk r fel az informcit. Maximlis kapacitsa 650 MB, vagy szabvnyos zenei CD esetn 74 perc lehet. Az informcit digitlisan modullt lzerfnnyel rgztik a rtegen. rhat CD[3] (CD-R), vagy ms nven WORM lemez[4]: Egyszer rhat, de sokszor olvashat lemez. Amikor a lemezre adatokat runk, ers (a kiolvassnl nagyobb energij) lzerfnyt bocst a CD-r, amely kigeti a fnyelnyel rteget, s gy az alatta tallhat fnyvisszaver fellet lthatv vlik. A fnyelnyel rteg nem alakthat vissza, ha mr egyszer fnyteresztv vlt, ezrt a lemezre mr felrt informci nem mdosthat, nem trlhet. Kapacitsa 650 800 MB. jrarhat CD[5] (CD-RW): Az jrarhat CD tartalma akr tbb ezerszer is jra rhat. Az adattrolsra ennl a lemezfajtnl visszafordthat technolgit alkalmaznak, amely azonban drgbb, gy ezek a lemezek drgbbak az rhat CD-knl. Ezenkvl lteznek gynevezett magneto-optikai[6] (CD-MO) lemezek is. Ezek rhat, trlhet, s jrarhat lemezek. Felvteli technolgija egyesti a mgneses jelrgzts rsi, s trlsi elnyeit a lzeroptika nagy rssrsgvel. Az MO lemezek az adattrols rdekben a fny mgneses trbeli viselkedst is kihasznljk a hagyomnyos optikai trolkkal szemben, melyeknl csak a lzerfny visszaverdsi s kioltsi tulajdonsgait hasznljk fel. A CD-MO lemez a hagyomnyos CD olvasban nem olvashat, mivel az adatok olvassakor az elektronika a visszavert fnyer polarizcis elfordulst rzkeli. [14] A CD lemez nem rklet, de tbb vtizedig kpes trolni az adatokat minsgromls nlkl persze, ha betartjk a szigor minsgi elrsokat-. 23. bra: CD-R lemezek 24. bra: CD-RW lemez 3.3.2 DVD Az egyre nagyobb adatmennyisg trolsnak ignye szksgess tette a CD kapacitsnl nagyobb adathordoz ltrejttt. gy szletett meg a DVD[7]. A DVD nagy kapacits optikai trol (digitlis sokoldal korong), amely leginkbb mozgkp, j minsg hang, valamint adat trolsra hasznlatos. A DVD-rendszer fellrl kompatibilis a CD-rendszerrel, ami azt jelenti, hogy a DVD meghajtkban olvashatk a hagyomnyos CD lemezek is. A CD kapacitsnak tbbszrsre kpes. A nagyobb kapacits elssorban annak ksznhet, hogy kisebb hullmhossz lzerfnyt hasznlnak, amely lehetv teszi a kisebb adattrolsi mret alkalmazst. gy a lemezen a bitek srbben helyezkednek el, mint a CD esetn. Ezenkvl tbb, egyms fltti rteget is lehet alkalmazni, amelyek mind egy kicsit ms hullmhossz fnyt kpesek visszaverni. 25. bra: A CD s a DVD lemez szerkezete DVD meghajt A DVD lemezeken kisebb mret lyukak s kzk tallhatak, valamint a spirlis svok tvolsga is kisebb, gy a lzerhullmhosszt cskkentve kisebb fnyfoltra trtnik a fkuszls. A DVD-CD kompatibilits jegyben a DVD meghajt egysgek kt klnbz lencserendszert hasznlnak a kt klnbz optikai trol olvasshoz. A holografikus lencsefellet kzepn tallhat bevgsok hosszabb, a lencse szle ahol nincsenek bevgsok rvidebb fkuszt eredmnyeznek. Egyes meghajtk ikerlencss megoldssal olvassk a CD-t s a DVD-t. 26. bra: A DVD-ROM meghajt optikja A DVD lemez mindkt oldaln kialakthat kt trol rteg. A ktrteg lemez, DL-lemez (Dual vagy Double Layer) a mr megszokott DVD+(-)R korongok kapacitsnak (elvi) megduplzsa mg egy rhat rteg segtsgvel. A lemez els, rhat fellett (alulrl, a lemez rhat oldaltl felfel haladva) egy manyag polikarbont rteg vdi, mg az ezt kvet rhat felletet egy, a lzer fnyt flig tereszt, fmes, tkrzd rteg kveti. Efltt szintn egy fmes, tkrz felletet tallunk, amely ezttal mr nem engedi tovbb a lzernyalbot. A polikarbont rteget a feliratot hordoz fellet kveti. DVD fajti: DVD-Video (mozgkpek trolsra); DVD-Audio (hang trolsra) DVD-ROM (adat, prselt, csak olvashat): sokoldal digitlis ROM lemez, a CD-ROM nagykapacits utdja, legalbb 4,7 GB trterlettel. Az alkalmazsok kztt els helyen szerepel digitlis vide-llomnyok (filmek) trolsa. Elre megrtak, teht hzi rsuk nem lehetsges. Vannak ktrteg lemezek, ezek kb. 8,5 GB adatot tartalmaznak. DVD-RAM (adat, kzvetlen elrs, tbbszr rhat). A DVD-RAM picit kilg a sorbl. Kln trolja van, mely miatt termszetesen mr az olvasshoz is msfajta eszkz kell, mint a tbbihez. Befogadkpessge 4,7 GB oldalanknt. 27. bra: DVD-RAM, mely felismerhet kockssgrl A DVD-R s +R lemezeket egyszer lehet csak rni, mg a -RW s +RW lemezek tbbszr rhatk. Lteztek Mini DVD+R lemezek (80 mm-esek), melyek kapacitsa 1,5 GB krl van. 28. bra: DVD-R s DVD-RW lemez A DVD lemezek kapacitsa az oldalak s rtegek szmtl fgg. A DVD lemezeknek ngy alaptpust klnbztetjk meg: DVD5: a legegyszerbb DVD lemeztpus; egyoldalas, egyrteg lemez, kapacitsa 4,7GB. DVD9: egyoldalas, ktrteg lemez; kapacitsa 8,5 GB. A ktrteg lemezek rdekes tulajdonsga, hogy mg az els rteg beolvassa a forgstengelytl kezddik, s az olvasfej kifel halad, a msodik rteg mindkt irnyban olvashat, azaz a msodik rteg kvlrl befel is tartalmazhat adatot. DVD10: ktoldalas, oldalanknt egy rteg DVD lemez, a kapacitsa 9,4 GB. Kapacitsa pontosan ktszerese a DVD5 lemez kapacitsnak. DVD18: a ktoldalas, oldalanknt ktrteg DVD lemez, a kapacitsa 17 GB. Mkdsi elve hasonl a DVD9 lemezekhez, azonban itt a lemez mindkt oldaln kialaktjk a kt-kt adathordoz rteget. [14] Egy kznsges DVD lettartama, j tartsi krlmnyek kzt 10-15 v. rdemes fnytl vdett, hvs, pramentes helyen tartani ket. Lteznek archivlsi minsg DVD-k, ezek lettartama hosszabb (100 v). ruk a norml DVD tbbszrse (5-/6X6-szorosa). 3.3.3 HD DVD s Blu-ray Tovbbi elrelps az adatsrsg nvelsben a HD DVD s a Blu-ray lemezek. HD DVD HD DVD lemez akr hrom rtegbl is llhat. Minden egyes rteg 15 GB mennyisg nagy felbonts tartalom trolsra kpes, gy a HD DVD lemezek maximlis kapacitsa 45 GB. A HD DVD lemezek karcllak. Visszamenlegesen kompatibilisek a DVD lemezekkel, gy a DVD lemezeken trolt tartalmak tovbbra is lejtszhatk a HD DVD-lejtszkkal. A DVD technolgihoz hasonlan a HD DVD az adatokat mikroszkopikus mret lyukak sorozataknt trolja, melyek egy hossz spirl formjban helyezkednek el a lemezen. A vrs lzeres technolgin alapul DVD lemezekkel ellenttben a HD DVD lemezek kk lzeres technolgit alkalmaznak a nagyobb trkapacits rdekben. Rvidebb, 405 nanomteres hullmhossznak ksznheten ellenttben a DVD lemezek 650nanomteres hullmhosszval a kk lzeres technolgival nagyobb mennyisg adat trolhat a HD DVD lemezeken. [15] Blu-ray Egy jelenlegi, egyoldalas, hagyomnyos DVD 4,7 GB adatot kpes trolni, ami elegend egy tlagos 2 rs, norml felbonts filmnek s nhny extra adatnak. De egy nagy felbonts film, aminek sokkal tisztbb kpe van (HDTV High-Definition Television), mint egy DVD filmnek, krlbell 5-szr tbb hely kell, ezrt elengedhetetlen olyan lemezek gyrtsa, amin sokkal tbb adat fr el, mint egy DVD-n, ahogy a stdik is egyre-inkbb jobb minsgben gyrtjk a filmeket. Ahhoz, hogy a HDTV-rl felvegynk egy tbb, mint 2 rs msort, Blu-ray lemezt kell hasznlnunk. A BD az adatok rshoz s olvasshoz kk lzert hasznl, ellenttben a DVD-kkel, amik vrs lzert hasznlnak. A kk lzer rvidebb hullmhosszon mkdik, mint a vrs lzer. A kisebb fnynyalbbal pontosabban lehet fkuszlni, ami lehetv teszi, hogy olyan kis gdrcskbl (pits) is ki tudjuk olvasni az adatokat, amik csak 0,15 mikromter hosszak ez tbb, mint ktszer kisebb a DVD-n tallhat kis gdrkhz kpest. Ezen fell a Blu-ray lecskkentette a svok hvelykmrett. A kisebb gdrcskk, a kisebb fnysugr, s a rvidebb sv-hvelyk egyttesen azt eredmnyezte, hogy egy egyrteg Blu-ray lemezen tbb mint 25 GB informcit tudunk trolni, egy dupla rteg Blu-ray lemezen, pedig mintegy 50 GB-nyi adatot. [24] A Blu-ray Disc sokig formtumhborban llt a HD-DVD-vel. Ezalatt mindkt formtumnak krlbell ugyanannyi tmogatt sikerlt gyjtenie. A hbort vgl a Warner dnttte el, amikor 2008 elejn a cg feladta a HD-DVD-vel kapcsolatos terveit s llst foglalt a BD mellett. Ezutn a NetFlix s a BestBuy kereskedelmi ruhzlnc is kzlte, hogy kivonja a knlatbl a HD-DVD lemezeket. A formtum gyzelmhez valsznleg a Sony j jtkkonzoljnak (Playstation3) megjelense s sikere is hozzjrult. Ez a konzol beptetten tartalmaz Blu-ray meghajtt, mg a konkurens Microsoft XBox konzolja csak DVD meghajtt. A Toshiba 2008. februr 19-n bejelentette, hogy fokozatosan lelltja a HD-DVD lejtszk, felvevk fejlesztst, s gyrtst. gy a formtumhbor gyakorlatilag vget rt a Blu-ray Disc gyzelmvel. [16] 29. bra: HD-DVD s Blu-ray Disc 3.3.4 HVD holografikus troleszkz A holografikus adattrols szinte korltlan lehetsget nyjt a kapacits s az adattviteli sebessg tern. 2004-ben a technolgia fejlesztsben rintett szakemberek konferencija hrom klnbz holografikus adattrol kifejlesztsben llapodtak meg: a 200 GB trolkapacits Holographic Versatile Disc (HVD), a 100GB-os Read-only Holographic Versatile Disc (HVD), s a 30GB-os Holographic Versatile Card (HVC). Az InPhase els mkd, prototpusnak nevezhet meghajtja a 130 mm tmrj, teht a CD/DVD-nl valamivel nagyobb lemez segtsgvel 200 gigabjtnyi adatot kpes eltrolni 20 megabjt/s-os adattviteli sebessg mellett. Egy ilyen els genercis holografikus lemezen durvn 40 darab 4,7 gigabjtos DVD-lemeznek, illetve kzel 300 darab CD-nek megfelel digitlis anyag trolhat el. A holografikus adattrol eszkzkben az adatok rsa s olvassa az eddig alkalmazott optikai meghajtkkal ellenttben nem bitrl-bitre, sorban trtnik, hanem prhuzamosan. A klnleges technolgia segtsgvel egyetlen fnyvillans alatt bitek millii vndorolhatnak a lemezre, illetve olvass esetn a meghajt tmeneti memrijba. Az j optikai eljrssal kis helyen hatalmas mennyisg adat trolhat. Postablyeg mret helyen tbb tz gigabjtnyi adatot lehet rgzteni, mg egy bankkrtya mret, tltsz plasztiklap ksbb akr 20-50 gigabjt adatot is tartalmazhat. Az amerikai inPhase Technologies tervei szerint 2010-re a 130 mm-es lemez elkpzelhetetlenl sok adatot trolhat majd, megkzeltleg 1,6 terrabjtnyi kapacitssal rendelkezhet. Az j technolgival kszlt lemezeket 10 milli alkalommal lehet hasznlni, lettartamt pedig 50 vre becslik. A holografikus adattrolsi technolgia a jv egyik nagy grete egyelre csak a nagyobb, tehetsebb vllalatok szmra rhet el kereskedelmi forgalomban. [17] A mikro-holografikus troleszkzk s lemezek elrelthatan valamikor 2011-2012-ben kerlnek bemutatsra, s valsznleg csak nagy adattrolsi igny alkalmazsok, pldul orvosi intzmnyek adatkezelsre, esetleg filmstdik anyagainak trolsra alkalmazzk majd. 30. bra: Holografikus lemez 3.4 Flash alap trolk Napjainkban egyre nagyobb teret hdtanak a flash alap adattrolk. Ebbe a kategriba tartoznak a klnbz mret, tpus pendrive-ok, memriakrtyk, valamint az SSD-k. A flash memrik kis mret ltalban manyag tokban helyet kap rhat-olvashat, nem felejt, megmarad (non-volatile) ramkrk, vagyis tartalmukat ramellts nlkl is megrzik. Ilyen, flash alap memrikat hasznlnak pldul a digitlis fnykpezshez, MP3-llomnyok trolshoz. Tovbb a flash gyors olvass hozzfrsi idt biztost (50nS) br nem olyan gyorsat, mint a volatile, vagyis kikapcsols utn felejt RAM, DRAM vagy SDRAM memria, melyet f memriaknt hasznlnak pldul a PC-kben -, valamint, mivel nem tartalmaz mozg alkatrszt, jobban ellenll a mechanikai behatsoknak (pl. a rzkdsnak), mint a merevlemez. Ezekkel a tulajdonsgokkal magyarzhat a flash npszersge. Tovbbi elnye, hogy ha ezeket memriakrtyba csomagoljk, akkor majdnem elpusztthatatlan fizikailag, mivel ellenll a nagy nyomsnak, s a forr vznek is. A flash chipek gyrtsi technolgijn folyamatosan dolgoznak a gyrtk, ennek ksznheten a flash memriachipek kapacitsa fokozatosan n. Mr bemutattk a vilg els 25 nanomteres eljrssal kszl NAND flash lapkit, amelyeket idn nyrtl kezdenek tmegtermelsben is gyrtani. A bemutatott 64 Gb-es, azaz 8MB-os lapka valamelyest kisebb terletet foglal el, mint az elz genercis 4 GB-os, vagyis nagysgrendileg ugyanakkora gyrtsi kltsggel ktszer akkora memrit lesznek kpesek gyrtani pl. az SSD-k szmra. 3.4.1 Memriakrtyk Technolgiai szemszgbl alapveten ktfle memriakrtya ltezik: * flvezets (pl.: SmartMedia, Compact Flash) * mgneses (pl.: IBM Microdrive) 31. bra: 1 GB-os memriakrtya Mkdsi elve: A memriachip valjban EEPROM tpus memria. (EEPROM[8]:elektronikusan trlhet s programozhat, csak olvashat memria. Tartalma elektromossg segtsgvel jrarhat. Tipikus felhasznlsi terlete a mai BIOS-ok, s ilyen memria mkdik a jtkkonzolokban is.) A chip rcsos felpts, ahol az adott rcspontok reprezentljk a biteket. Egy-egy bitet a megfelel oszlop s sor metszeteknt rhetnk el. A sorok s oszlopok tallkozsnak helyn mindkt oldalon egy-egy tranzisztor lapul Az egyik tranzisztort vezrlkapunak, a msikat pedig kvetnek nevezik. A kvetkaput megtestest tranzisztor csak a vezrlkapun keresztl kapcsoldik a sorokhoz. A kt tranzisztor kztt egy nagyon vkony oxidrteg hzdik. Amg a kt tranzisztor kztti oxidrteg semleges tlts (teht a kapu nyitva van), a tranzisztorok kztt sszekttets van, a krdses bit rtke 1. Ahhoz, hogy ez 0-ra vltozzon, a kvetkapu fel feszltsget kell kldeni a krdses bitet reprezentl oszlopon keresztl. A feszltsg hatsra a kvetkapu mintegy elektrongyknt kezd funkcionlni: az oxidrtegnek negatv tltsv teszi, s megszaktja a kapcsolatot a kt tranzisztor kztt. A megszakts annl hatsosabb, minl negatvabb az oxidrteg. Egy rzkel cella mri a kvetkapu s a vezrl kztt thalad tlts nagysgt. Ha ez az rtk 50% al cskken, az rzkel cella 0-t ad vissza a bit rtkeknt. A bitek visszavltoztatsa sem tl bonyolult: az egyes biteken keresztlmen ers tlts ugyanis jra teljesen kinyitja ket. A mvelet viszont elg lass a pozcionls miatt. A trls sebessgnek nvelse rdekben a flash lapkk esetben egyszerre egy blokk (esetleg az egsz adatterlet) trldik, majd a vezrlchip jrarja az elzleg trlt terletet. A flash-memrik kapui akkor is megrzik llapotukat, ha nincsenek feszltsg alatt, gy kivlan megfelelnek a cserlhet adathordozk cljainak. A memriakrtyk nagyon megbzhat krtyk, nagysgrendileg 1 milli rs mkdst garantlnak (a megbzhatatlanok persze jval kevesebbet). Ez nagyjbl 100 ves folyamatos hasznlatot jelent. [18] 3.4.2 Pendrive Amg ez meg nem jelent, semmi sem veszlyeztette a 3,5-es floppy meghajtt. Igaz egyre kevesebben hasznltk, de a gpek tbbsge mg tartalmazta. Egy levelet, kpet, kisebb fjlokat knnyen r lehetett tenni, s mentsknt eltenni, vagy tvinni egy msik gpre. Mkdsi elve megegyezik a winchestervel. Nos, gy nz ki, ennek vge. A pendrive kisebb fizikai mret, gyorsabban csatlakoztathat, csak egy USB port kell hozz, s kapacitsa is sokkal nagyobb, 64 MB-tl 128 GB-ig terjedhet, m tavaly, 2009-ben megjelent a Kingston Technology ltal a 256GB-os DataTraveler 300. lettartamuk 10 v, s ez alatt egymilli rst, s trlst brnak ki (tbb gyrt is 10 v garancit ad termkhez). tviteli sebessgk 1Mbit/sec, de USB 2.0-val 3 Mbit/secakr 20MB/s is lehet az rsi s az olvassi mveleteknl egyarnt [https://www.hardver-teszt.hu/news.php?newsID=463], de ltezik 30MB/s feletti sebessg meghajtk az olvassi mveletek tekintetben, viszont ezeknl a meghajtknl az rsi mveletek sebessge csak 15MB/s krli.. Aki mr hasznlta, az tudja, hogy gyors, knyelmes, s minden rfr. Ez a floppy kegyelemdfse. Megszletsn mig vitatkoznak, mivel kifejlesztsnek elssgt tbb cg is magnak ignyli. Mindenesetre 1999-nl nem elbb, s 2000-nl nem ksbb szletett. [19] A pendrive (USB-flash-trol) egy USB-csatlakozval egybeptett flash memria. nllan nem kpesek adatcserre, csak szemlyi szmtgpre csatlakoztatott llapotban, arrl vezrelve. nll ramforrsuk csak akkor van, ha egyb szolgltatssal is rendelkeznek, pldul MP3-zenelejtszs, diktafon funkci. A pendrive egy parnyi nyomtatott ramkrt tartalmaz, a rerstett fmcsatlakozval, ltalban egy manyag tokba tve. A tokozsa a felhasznli ignyektl fggen vltozatos: van por s cseppll kivitele, s kiemelten tsll kivitele is. Mg a krtykat jellemzen fnykpezgpben hasznljk, addig a Pendrive-ot a szmtgp USB csatlakoz portjra helyezve mindenfle adatok trolsra, s azok mozgatsra. Elnyei: kis mret, nagy kapacits, hordozhatsg, ellenllsg kls hatsokkal szemben. 32. bra: Pendrive 3.4.3 SSD gy tnik, a winchester egyeduralma is a mlt, ugyanis megjelent az SSD. Ennek kifejlesztsekor a cl a winchesterek htrnyainak kikszblse volt. Hogy mik ezek? Elg nagy mret s sly, a mechanika miatti srlkenysg, rzkenysg a rzkdsra, valamint az adatkezels lasssga. SSD: Solid State Disk vagy Drive, magyarul flvezetalap, mozg alkatrszek nlkli adattrol, amely merevlemezknt csatlakoztathat a szmtgpekhez. Azrt flvezetalap, mert belsejben nem korongok, hanem memriachipek tallhatk. Ktfajta SSD-t klnbztethetnk meg: a DRAM- s a flash-alapt. A flash-alap nem felejt, a DRAM-alap tulajdonkppen megegyezik a gp memrijval, amelyrl tudjuk, hogy csak ram alatt rzi meg az adatokat Az ilyen tpus SSD-k ezrt kln akkumultorral kszlnek. A flash technolgia miatt az adatok elrsekor nem kell szmolnunk a fizikai alkatrszek mozgatsbl add sebessgcskkenssel, azok kopsval vagy meghibsodsval, a rzkds, vagy egyb fizikai behatsok ltal okozott krokkal, nem is beszlve az energia-megtakarts s a zaj krdseirl. [26] Az SSD gyakorlatilag megegyezik a flashmemria-alap SSD-vel. Az SSD-k idvel tvehetik a vezet szerepet a htkznapi adattrolsban, hiszen csendesebbek, gyorsabbak, strapabrbbak, s kevsb energiaignyesek, mint a hagyomnyos HDD-k. Az lettartam is fontos krds az SSD-kkel kapcsolatban. Az jabb SSD-k vrhat lettartama kezdi megkzelteni a hagyomnyos merevlemezekt. rdemes megemlteni, hogy van olyan gyrt, amely egyes SSD-ire mr 5 v garancit vllal. sszefoglalva: Elnyk: * Gyorsasg. (nincs felprgs) * Mechanikailag megbzhatsg (kpes elviselni az tst, vibrcit, nyomst, hmrskletet) * A fjlok tredezettsge nem lasstja a mkdst. * Zajmentes (nincsenek mozg alkatrszek s htventilltor) * Nem Kevsb melegszik (a tesztek [] alapjn nem egyrtelm) * Kis sly, s kis mret * Kis fogyaszts (a mobil merevlemezekhez viszonytva elhanyagolhat az elny). Htrnyok: * Drgk. Egyelre az r/trolkapacits arnyuk rosszabb a HDD-knl. * Kis kapacits. * lettartam. A flash memrik lettartama egyelre gyengbb a merevlemezeknl. * Az rs lasssga. Ez is csak a flash memriknl jelentkezik, hogy lassabban rhatk, mint a HDD-k. A DRAM-os megolds gyorsabb. * Fokozottan rzkeny a hirtelen ramkimaradsra, a mgneses s elektromos mezkre. Mindezekbl lthat, hogy a winchesterek mg versenyben vannak, de ersen vesztsre llnak. A kis mret, kis sly, kis fogyaszts nagyon kvnatoss teszi az SSD-ket, fleg a hordozhat gpek szempontjbl, s biztos, hogy a nagyobb gpek is csak keveset vrnak, hogy a htrnyokat cskkentse a technika fejldse. [20] 33. bra: 64 GB-os Samsung SSD 4 A TROLKAPACITS NVEKEDSE A szmtstechnika vilgnak dinamikus fejldse a httrtrakra is jellemz. A gyrtk szinte naponta dobjk piacra a httrtrak jabb s jabb tpusait, illetve teljesen j rendszer troleszkzeiket. A httrtrak kapacitsa s sebessge egyre n, mikzben ruk folyamatosan cskken. A kvetkez tblzat a klnbz httrtrolk kapacits-nvekedst mutatja be. Az els adattrolk (lyukkrtya, lyukszalag) nagyon primitvnek szmtottak a mai technikai vvmnyokhoz kpest, igaz valahol el kellett kezdeni. Az akkori kornak ez volt elrhet kzelsgben. A fejlds ms ipargakhoz kpest nagyon gyorsan trtnt, hatalmas lpsek vannak az jabbnl jabb adattrolk kztt. Amg az autiparban 5-10 vnek is el kell telnie, hogy valami maradandt alkosson, addig a szmtstechnikban 1-2 v elegend ehhez. A tblzatbl lthat, hogy els adattrolk krtyk, illetve szalagok voltak. Idvel megjelentek a mgneses hajlkonylemezek, majd a merevlemezek, gy levltva az eddigi eszkzket. A rgi tallmnyok kzl jelenleg mg a mgnesszalagot hasznljk, mivel vllalati szinten ez a lehet legolcsbb s legpraktikusabb archivlsi, adattrolsi forma. A httrtrak kapacitsnak nvelsn folyamatosan dolgoznak a gyrtk. Az SSD-k kapacitsa pr ven bell elrheti a hagyomnyos HDD-k kapacitst, s akkor mr szinte minden tekintetben lekrzhetik ket. 1. tblzat: Trolkapacits-nvekedsi sszehasonlts a httrtrol tpusok kztt 5 A HOZZFRSI SEBESSG NVEKEDSE A merevlemezeken troljuk adataink tbbsgt, s jelenleg mg mindig ezek azok a httrtrak, amelyek a legmegbzhatbbak, legkompaktabbak, pontosabban: a kompaktsgra s megbzhatsgra es r nluk a legalacsonyabb (hiszen vehetnnk pp flash-krtyt is HDD helyett). Ugyanakkor a merevlemez vissza is foghatja egy korszerbb rendszer teljestmnyt, ha mr nem tudja megfelel sebessggel kielgteni a processzor ignyeit. Amikor valaki egy j merevlemez vsrlsn gondolkodik, a kiszemelt termk kapacitsn fell a sebessget, a megbzhatsgot s jabban egyre inkbb a zajszintet igyekszik szem eltt tartani. De mert a megbzhatsg mindig relatv, radsul mondhatni tesztelhetetlen, gy meg kell elgednnk a sebessg s a hangtnyez bemutatsval. No persze ez sem kevs. [27] A merevlemezt az egyre nagyobb kapacits, gyorsabb, s sokkal kevesebb fogyaszts flashmemrik szorthatjk ki, elszr a hordozhat szmtgpek, majd az asztali gpek terletn is. Az SSD legfbb elnye a sebessge, amely csak rszben ksznhet a mozg alkatrszek hinynak. Egy hagyomnyos merevlemeznl ktszer-hromszor is kpes gyorsabban olvasni, mg az rsi sebessge nagyjbl azonos egy jl fejlett merevlemezvel, vagy annl is gyorsabb. A NAND flash szilrdtest-meghajtk gyorsabb rendszerindtst tesznek lehetv, mint a merevlemezek, mivel nincs mozg alkatrszk, a lemeztnyroknak nem kell felprgnik, s a fejeknek sem kell bellniuk arra a pontra, ahol az adatok fizikailag elhelyezkednek a korongokon. Gyakorlatilag nincs, illetve alig van ksleltets az adatok olvassnak s rsnak a megkezdsnl, tovbb nincs jelentsge a tredezetten elhelyezked llomnyoknak sem. [28] A mgneses elven mkd merevlemezek vtizedek ta szolglnak a tarts (de nem felttlenl archv cl) adattrols elsdleges eszkzeiknt. Kialakultak a szabvnyok sebessgre, kapacitsra, csatolkra, a felhasznlk tudjk, hogy mit vrhatnak el az egyes eszkzktl. A b tvenves fejlds azonban nem tudott vlaszt adni tbb, jonnan felmerl problmra: a mretcskkensre, a hozzfrsi id lervidtsre, vagy az adattvitel sebessgnek nvelsre. Az SSD-knl nagysgrendekkel javult az adatok elrhetsge: a vletlenszer hozzfrs szzszor-ezerszer gyorsabb lehet, mint a merevlemezek. Az adattvitel sebessge is jcskn megntt: a merevlemezek 20-40 megabjt/msodperces rsi/olvassi sebessgvel szemben az SSD legalbb 200 megabjt/msodperces rsi s ennl ngyszer nagyobb olvassi sebessget knl, de elmletileg lehetsges a gigabjtos adattvitel is. 5.1 HDD s SSD sebessg tesztek 2. tblzat: SSD-k s HDD-k rsi, olvassi sebessgnek sszehasonltsa 3. tblzat: SSD tpusok maximlis rsi, olvassi sebessge 5.2 A Computer Klinika SSD tesztje A teszthez egy HP Compaq 6710b notebookot hasznltak. Intel Core 2 duo processzorral, 2GB RAM-mal s w 2k3 opercis rendszerrel: Az ssd ocz mrkj 64GB-os SSD eredmnyei: o ssd boot: 50sec o ssd hibernls: 23 sec o ssd hibernlsbl visszallts: 40 sec o msols helyben 1GB feletti llomny esetn: 20000 kilobyte/sec 45000 kilobyte/sec kztt A hdd egy hitachi 7200 fordulatszm(!) lemez: o hdd boot: 80 sec o hdd hibernls: 35 sec o hdd hibernlsbl vissza: 50 sec o msols helyben 1GB feletti llomny esetn: 7000 kilobyte/sec 17000 kilobyte/sec kztt, de inkbb az als vgn az intervallumnak. Azaz ugyan ezt az sszehasonltst egy norml 5400-as fordultaszm HDD-vel elvgezve az albbi eredmnyek vrhatak: o hdd boot: 106 sec o hdd hibernls: 47 sec o hdd hibernlsbl vissza: 67 sec o msols helyben 1GB feletti llomny esetn: 4500 kilobyte/sec 13000 kilobyte/sec Ez azrt fontos, mivel a jelenleg kaphat notebookok, netbookok tbbsgt 5400 fordulat/perc-es httrtrakkal ruljk. [29] [1] DAT: Digital Audio Tape, magyarul: Digitlis hang-kazetta [2] CD-ROM: Compact Disc Read Only Memory [3] rhat CD: CD Recordable [4] WORM: Write Once Read Many [5] jrarhat CD: CD Rewritable [6] CD-MO: Compact Disc Magneto-Optical [7] DVD: Digital Versatile Disc (digitlis sokoldal lemez), vagy Digital Video Disc [8] EEPROM: Electronically Erasable and Programmable ROM

Antisemitism essays

Discrimination against Jews expositions The Holocaust was not a carefully Jewish occasion that lone included the European Jewry as a culture. The Holocaust started with the willful extermination acts that started in 1939 when under the Nazi Party residents that were racially German who were intellectually sick, genuinely debilitated, and hopeless wiped out were gassed and murdered. Alongside European Jewry different gatherings, for example, Russian detainees of war, gay people, Jehovahs Witness, vagabonds and others were oppressed and executed. In spite of the fact that the European Jewry made up most of those slaughtered by Nazi Germany they were by all account not the only ones influenced by the Nazis rule. The first to be influenced by the Holocaust were the individuals who in 1939 had been truly and intellectually hindered. These killings were viewed as kindness killings and under this willful extermination program around eighty thousand individuals were murdered in six unique places. These were not by any means the only slaughtering that happened however they are the ones that any record of Hitler really requesting and are in this way the most significant proof for the beginning of the Holocaust. Likewise, the murdering of genuinely and intellectually hindered individuals implied that European Jewry were by all account not the only to be dependent upon the repulsions of the Nazi state. Another association between the early killing acts and the later concentration camps is that the scientific experts who played out these demonstrations were and tried different things with various toxic substances and carbon monoxide were moved toward the East to proceed with their work there. Since pe ople in general had gotten mindful of the moves being made by the Nazi government the projects were eased back down and step by step moved out of Germany all together. Another contention that functionalist use is that albeit some expectation was there to free Germany of its Jewish populace it was not centered around annihilating them totally. A similar enemy of Semitist suppositions were similarly as solid if not more grounded in the Great Britain and France. This enemy of Semitic... <! Discrimination against Jews articles At the point when God made the world,He designed the races:The Indians, the Negroes, the Chinese. And furthermore the mischievous animal called the Jew. This platitude originates from a childrens book distributed in Germany in 1936. The inquiry raised by it is how did the German individuals so promptly acknowledge this sort of detest strategy from their pioneer? The appropriate response is to be found in the social and recorded texture of the European people group and particularly in that of the German individuals. There is one string that has a significant effect to this inquiry of why, it is called discrimination against Jews. To respond to the inquiry introduced, one must follow the string as it weaves its way through the embroidered artwork of against Jewish activities. To comprehend the discrimination against Jews and the acknowledgment of it by the Nazi time frame German populace, one should initially take a gander at discrimination against Jews and its beginnings in history preceding the Nazi time frame. The string of discrimination against Jews was doubtlessly spun in the medieval period with the contention between the Christian church and the Jews. European discrimination against Jews is a characteristic consequence of the religion of Christianity. By the word religion, the possibility of convention and devout reasoning is induced, not the instructing of Jesus which is love for all humankind. From the most punctual long stretches of Christianitys becoming stronger over the Roman Empire, its pioneers lectured against Jews, utilizing enthusiastic and extremely incredible judgments. The mental and philosophical need that prompted Christians to take a gander at themselves uniquely in contrast to the Jews( who brought the religion from which their o wn had severed) was brought into the world again and again with each new age, in light of the fact that as long as the Jews dismissed the disclosure of Jesus, they tested the Christians sureness in that disclosure. The Christians imagined that if the Jews-the individuals of God-stayed away from the Messiah God had guaranteed them, at that point something wasn't right. Either the Messiah was bogus, or t... <!

Topic Ideas For College Entrance Exams

Theme Ideas For College Entrance ExamsIf you're stuck for thoughts, the best spot to discover exposition subjects is school. Schools are occupied with their work and they don't have the opportunity to spend in exploring points to assist understudies with making a decent and fascinating scholarly paper. Writing a paper for school affirmation tests is certainly not a terrible one however. School gives adequate time to an understudy to compose an intriguing article, particularly on the off chance that they're accustomed to composing essays.The composing or papers should be utilized for your coursework so you can expert them in the event that you recognize what you're doing and where to go for thoughts. There are a couple of significant territories that ought to be canvassed in any exposition and you ought to learn them before you start composing your paper. This will assist you with making a decent contention when you endeavor to handle them in your work.One of the main subjects that ou ght to be handled is the class you're taking. The educator will diagram a portion of the course material for the remainder of the class. It's significant that you investigate this material and truly study it so you comprehend the ideas unmistakably. You have to consider what you need to cover and how you will move toward the theme. When you recognize what you're going to state, you can begin conceptualizing subjects to remember for your work.Another incredible approach to win the school confirmation tests you need is to look into points that identify with the general themes you're covering. Possibly you're composing a paper on movement, so you should investigate the various types of movement. A voyager may do visits in Japan, Paris, Rome, New York or some other significant city around the world.Course material that may be allocated for classes may be valuable to remember for your article as well. These might incorporate examination aides or worksheets or how to aides and books. Thes e may be an incredible expansion to your paper on the off chance that you realize how to sort out them well and present them in a consistent manner.Finally, go see your companions and peers and approach them for counsel on composing a decent exposition for the school you're keen on or the understudy body you are contending with. They may have extraordinary understanding or you may gain proficiency with some things. By having the option to glance in others' eyes, you'll be progressively sure when you're taking a gander at your own writing.There are different spots you can discover article subjects for school placement tests. While your companions and the workforce may be happy to offer a few proposals, you should look online for subjects that intrigue you. The web gives a lot of destinations that highlight themes for you to pick from.Sports, recent developments, books, history thus considerably more would all be able to be utilized as topic for your paper. A little inventiveness goes far. On the off chance that you realize how to transform the thoughts in your mind into words, the utilization of subjects is boundless.