Are the SAT Subject Tests Changing

Are the SAT Subject Tests Changing SAT / ACT Prep Online Guides and Tips The SAT was redesigned in 2016- a huge revamp that has been linked to the Common Core and attempts to re-secure market share lost to the ACT.This may leave you wondering: what about SAT Subject Tests? Are they changing? Will there be new SAT Subject Tests modeledafter the main SAT redesign? In a word, no. At least, not now. So what does this mean?Well, for starters, it means that SAT Subject Tests will now be even more different from the regular SAT than they were before the SAT redesign. In this article, I’ll go over the implications of the â€Å"mismatch† between the redesigned SAT and the SAT Subject Tests. How are the formats different, and how should you approach these differences?I’ll also go over how the SAT redesign has changed how Subject Test content overlaps (or doesn’t) with the regular SAT.Finally, I will engage in some wild speculation (okay, fine, evidence-based speculation) about where the SAT Subject Tests may be going in the future. The SAT Subject Tests Are Not Changing First things first: the SAT Subject Tests are not changing. The College Board has come right out and said it! Of course, this doesn’t mean that the SAT Subject Tests will never change or be redesigned, but, at present, nothing has been announced. So you can expect that they will be administered in the same format for at least the next few years. However, the main SAT redesign does mean that there are now some additional differences between the regular SAT and the SAT Subject Tests. The winds of change...are not blowing for the SAT Subject Tests. Formatting Differences Between the New SAT and the SAT Subject Tests There were always some differences between the SAT and the SAT Subject Tests. While Subject Tests are each one hour long in a specialized subject area, the regular SAT is a multi-section, broad-content test with variable time lengths per section. This remains the case under the redesigned SAT. But with the redesign, there are a couple of additional differences between the two test types in question format and scoring.Let’s break them down: The redesigned SAT has only four answer choices per question, but mostSAT Subject Tests will continue to have five answer choices per question.The only exception is the foreign language Subject Tests, which have four answer choices per question. All things being equal, this means your chances of randomly guessing a correct answer on most SAT Subject Tests is 5% lower than on the main SAT (20% vs. 25%). This probably won’t make any real difficulty difference between the two exams because on a five-choice test like a Subject Test, there’s generally at least one really obviously wrong answer in the bunch. A bigger change is that the redesigned SAT has no penalty for guessing while the SAT Subject Tests will continue to have a penalty for wrong answers to discourage guessing. On Subject Tests with five answer choices (again, this is most of them), you'll lose 1/4 of a point for each incorrect answer. For the foreign language Subject Tests, which have four answer choices, you'll lose 1/3 of a point for each incorrect answer. This may actually make your test-taking strategy somewhat different between SAT Subject Tests and the regular SAT. Basically, you should definitely answer every question on the regular SAT, even if you have no idea of the answer because you lose nothing by guessing. In contrast, you might want to take a slightly more conservative approach on your Subject Tests and only guess when you can eliminate some answer choices. Otherwise, you run the risk of an extra penalty for getting the answer wrong. Don't get stung by wrong answer penalties! Subject Tests That Might Line Up With the New SAT...Or Not In addition to formatting changes, the SAT redesign also involved some pretty major content changes. We’ve reviewed those changes in-depth, but here’s a quick summary: All questions for Reading are now passage-based, and not all of the passages will be literary; there will be nonfiction passages. All questions on Writing will also be passage-based, and the emphasis has shifted a little more towards questions on writing style and away from questions on arcane grammar mechanics. The new Math sectionhas less geometry, and questions are rooted more in real-world situations and skills you learned in class and less on abstract â€Å"logic† type questions. The overall test is now weighted more heavily towards the Math section. Reading and Writing together form Evidence-Based Reading and Writing for 800 points and Math stays at 800 points (so the total is 1600 points). If we compare the redesigned SAT content to Subject Test content, we’ll see a surprising cadre of similarities and differences. Subjects that have never before overlapped with the main SAT will now have some points of overlap, and some Subject Tests, like Math, that used to share lots of material withthe main SAT aren’t all that similar to the redesignedSAT. These next sections will go over what material on Subject Tests is also covered on the SAT and how you can use this to your advantage when you prepare for both the main SAT and the Subject Tests. Subject Tests: Math 1 and Math 2 Overlaps with: SAT Math Both of the Subject Tests in Math still overlap with the Math section of the revised SAT, but less than they did before.While many similar topics are covered, there are some key differences between the way questions are presented. First, the new SAT Math has a no-calculator section and free-response questions. The SAT Math Subject Tests are all multiple choice, and calculators are allowed the entire time. Second, the redesigned SAT focuses much more on â€Å"real-world† style problems, mathematical modeling, and reading and interpreting data. Given this focus, the scope of the math tested on the exam has narrowed. (For one thing, there’s much less geometry). The SAT Subject Tests are much more about testing how well you’ve learned a variety of more advanced mathematical concepts, so you can expect a broader range of topics and more problems like what you would see on a high school math test. Math II covers evenmore advanced topics than Math I. Because of this, Math II overlaps with the new SAT Math section even less than Math I does. There’s just not enough room on Math II to cover some of the more basic math concepts that Math I and SAT Math both focus on. Here are the topics that still overlap among the three tests. You should be aware, however, that shared topics are weighted completely differently on each exam! As mentioned above, the new SAT Math is much less focused on geometry of all types than either of the Math Subject Tests, and it's much more interested in â€Å"real-world† style problems and mathematical modeling. Overlapping topics on all three math exams: Basic statistics: mean, median, mode, reading graphs Coordinate geometry for lines and circles Calculating volume of 3-D solids from formulas Basic trigonometry: right triangles, identities Creating mathematical models Manipulating and solving expressions, equations, and inequalities Ratios and proportions Complex numbers Math I and SAT Math both include some Euclidean plane geometry for angles, circles, and triangles; Math II does not (Euclidean geometry concepts are assessed via coordinate and 3-D geometry).Math II and SAT Math now also both cover radians, which are not covered on Math I. So will studying for Math Subject Tests help prepare you for the SAT Math section? Certainly, reviewing math topics that are covered on both the Subject Test you are taking and the main SAT Math section will be helpful, but the questions are presented differently, and there are topic areas that don’t overlap. This is particularly truefor Math II. If you’ve just taken Math I or Math II and you are now preparing for SAT Math, make sure that you aren’t relying too much on your calculator or multiple-choice strategies. These won’t be with you for the entire SAT Math section. Will studying for the Math section help with the math-based Subject Tests? Again, it will help you somewhat in that you will be studying some overlapping topics. But you’ll need to be prepared both for the topics that don’t overlap and for the different exam formats. All these math exams! It's enough to make your head spin. Subject Test: Literature Overlaps with: SAT Reading In some ways, SAT Reading is closer to the Subject Test in Literature than it was before because all of the questions on the Reading section are now passage-based, as in the Literature Subject Test. However, while Literature has only literary and poetic passages, the Reading section will now include a number of nonfiction passages as well. This means that, while the close-reading skills you develop for Literature will help you with the passage-based questions on SAT Reading, you will be reading and answering questions about some very different types of passages. You can expect to see nonfiction and historical passages on SAT Reading that you will need to read with an eye for identifying the evidence authors use to support their claims. By contrast, the SAT Literature Subject Test will have much more of an emphasis on literary devices. So will studying for Literature help prepare you for Reading? Sort of, in that it will hone your close-reading skills. However,you need to make sure you also know how to read non-fiction and historical passages for comprehension and to identify evidence, which really does not play into the Literature test at all. Conversely, will studying for Reading help prepare you for Literature? It will help a little bit, but the passages on Literature are much more, well, literary, so you will need to make sure you have a stronger grasp of literary devices than SAT Reading requires. Also, the Literature Subject Test has poetry, which is a whole different animal; for more guidance on that, see my guide to the Literature Subject Test. Read on to learn why this might be on your SAT Reading test! Subject Tests: US History and World History Overlaps with: SAT Reading This may surprise you, but you might now find some minor overlap between your US History or World History Subject Test and SAT Reading.SAT Reading now includes, in one of its five passage sections, â€Å"One passage or a pair of passages from either a U.S. founding document or a text in the great global conversation they inspired.† (see the College Board page for Inside the SAT Reading). The College Board claims that you won’t need any outside knowledge to understand the documents they choose for the Reading test, but any contextual knowledge you have about â€Å"U.S founding documents† (i.e. the Declaration of Independence, the Gettysburg Address, etc.) and their global counterparts certainly won’t hurt you. And, if you are taking the US History or World History Subject Test, chances are you have some of that outside contextual knowledge. Additionally, both history Subject Tests include some questions on primary source analysis- a similar skill to the analysis of historical documents on Reading. So, will studying for US History or World History help prepare you for the Reading section? It will help a little bit, by giving you historical context and the skills to close-read historical passages.Will studying for SAT Reading help prepare you for US History or World History? Again, it will help a little bit, depending on what â€Å"founding documents† you are exposed to in your studying. Subject Test: Biology Overlaps with: SAT Reading and Math The new SAT involves an increased amount of reading charts and graphs in the Reading, Writing, and Math sections.The Biology Subject Test also involves questions that test your knowledge of reading graphs and charts. So, learning to read graphs and charts for one of these exams will help you with this skill for all the other exams. Basically, making sure you know how to read graphs and charts properly is a skill that will help you on a number of College-Board administered exams, and also life. If jellyfish could read charts, they probably would have taken over the world by now. As you can see, while there is overlap between certain Subject Tests and the new SAT, none of the overlap is substantial enough that prepping for one really preps for the other in any significant way.Preparing for Subject Tests, in general, certainly won’t hurt your SAT performance or vice-versa, but it definitely won’t replace or even hugely augment specific prep for the exam you are taking. What Could Be Next for the SAT Subject Tests? So is a revamp coming for the SAT Subject Tests anytime soon?Well, let’s think about what niche the Subject Tests fill compared to the main SAT. The SAT is meant to be a college entrance exam that tests a wide variety of skills and predicts performance in college (it historically hasn’t really done this, but that’s the idea).The SAT was revised for a lot of reasons, but overall the goal is to make the SAT more predictive of college success and less based on whether you could afford a tutor or even a prep book to learn strategies. (Do I think the College Board met their goal? That’s a story for another day.) The SAT Subject Tests, however, never purported to be the kind of exam that any smart person could do well on. They have always been meant to showcase a particular talent or expertise in a subject. Because of this, I don’t think it’s terribly likely that there are any major content changes for the SAT Subject Tests coming anytime soon. However, I do think it’s a little bizarre to administer two kinds of SAT tests with different scoring mechanisms and a different number of answer choices. There may well be a more minor SAT Subject Test revision just for the sake of creating consistency between the two tests. Thus, while I don’t think a major revamp in content is coming soon, I do think it’s possible that there will minor revisions to make the tests more harmonious in format. Harmonious like these creepy singing angels. Key Takeaways Are the SAT Subject Tests changing? No! There will be no newSAT Subject Testsfor 2016. This means that, unlike on the main SAT, most Subject Tests have five answer choices per question, and there’s a -0.25 point penalty for every wrong answer. The exception is foreign language Subject tests, which have four answer choices per question, and there's a 1/3 point penalty for every wrong answer. The changing format of the SAT does mean that there may be some new and different overlaps between Subject Tests and main SAT content. In terms of future revisions, I don’t think there’s going to be a major content revision any time soon, but there may be a formatting revision to bring the two tests into greater harmony. What's Next? Trying to decide which SAT Subject Tests to take? Let us help.Or maybe you want some help registering for your chosen Subject Tests. Confused about the new SAT? See our guide to the new Reading sectionand our guide to redesigned SAT math. With the redesign, you might consider if the new SAT or the ACT is going to be better for you. Need a little extra help prepping for your Subject Tests? We have the industry's leading SAT Subject Test prep programs (for all non-language Subject Tests). Built by Harvard grads and SAT Subject Test full or 99th %ile scorers, the program learns your strengths and weaknesses through advanced statistics, then customizes your prep program to you so that you get the most effective prep possible. Learn more about our Subject Test products below:

Ethical Lens Inventory Results Essay

Ethical Lens Inventory Results Essay Ethical Lens Inventory Results Essay Ethical Lens Inventory Results Odessa Whitehouse US/101 March 15, 2013 Kendra Justice My Ethical Lens Inventory tells me that my preferred lenses are the results and reputation lenses because I tend to listen to my intuition to determine the greatest good for each individual and which character traits and virtues will best serve my community. I value autonomy and equality equally while seeking interdependence with a moderate value sensibility, following my heart to make prudent choices, using rationality and reasoning to find the rules of life. In practical matters I use wisdom and foresight as I act with enlightened self-interest, managing to avoid rash actions while staying optimistic, imaginative, and courageous in the face of obstacles. Tending to assume that everyone operates from a clear sense of their own values and positive character traits required by their role, I define ethical behavior as creating the greatest good by living out role responsibilities such as making responsible choices that benefit many different individuals at the same time. People who demonstrate strong leadership and encourage others to do the same exemplify ethical behavior in my eyes. The tools I use to analyze problems are experience and tradition. I see current situations in the light of experience and use a combination of intuition and imagination to incorporate new information and solve problems. I focus on what is going on in a situation, considering options that both reflect excellence in my role and make people happy. I consider multiple perspectives and am comfortable with ambiguity. I am self-reliant and accountable, not afraid to pursue my delights and freedom for all in my community. I am able to put myself in the shoes of others and tell their story. Ensuring that all have free will lessens the risk of reducing decisions to a narrow and purely financial cost-benefit analysis. Should my compassion fail I may believe that I am entitled to perks or privileges because of my role. If I fail to exercise free will responsibly, my pursuit of good for all can devolve into an excuse for taking as much for myself as I can get away with. If I become hard-hearted, I may apply capricious and inappropriate solutions. I may be prone to sudden unpredictable changes in attitude or behavior such as impulsiveness. I must develop the practice of mindfulness and reflection or I may face failure. I may lose friends because my acquisitiveness or obsession with responsibilities can drive them away. Ethical Lens Inventory Results My ethical lens directs my academic behavior in that I am able to see other people’s points of view with an open mind. I am able to put myself in their shoes to really

Outliers Assignment Example | Topics and Well Written Essays - 1250 words

Outliers - Assignment Example He is a sports lover and has an attitude inclined towards psychology and research. In his literature psychological and sociological issues are delved deeper by the use of sports at all levels. Gladwell said; "Im not sure that the boundaries that used to exist among different recreational activities will matter as much in the future." Gladwell is the writer of four books, all successful. He described his brainwave of writing as; "I have two parallel things Im interested in. One is, Im interested in collecting interesting stories, and the other is Im interested in collecting interesting research. What Im looking for is cases where they overlap." The Tipping Point gives a new way to understand world, Blink changed the view of thinking and Outliers transformed the understanding of success. He really is a gifted man with the ability to see beyond those simplicities which others ignore. Outlier is a statistical term which is used to define points which do not follow the trend. Literally an outlier is the odd one out, the different, the status quo breaker, the one who brazen out the routine and the one who has the ability to challenge the norms. The book â€Å"Outliers† is itself an out of the box idea of Gladwell. Like his previous books, Gladwell, in Outliers has followed his tradition of challenging the status quo. The name itself has embark an extremely different and entirely new definition of the term; â€Å"Outliers†. After reading â€Å"Blink† the initial two seconds spent on looking the book comprised of the name; â€Å"Outliers†. My very first opinion influence through the name of the book was that it will be a powerful piece of literature. To me the hypothesis is successful, decisions made in mere two seconds are as good as the decisions made cautiously and deliberately. The book; â€Å"Outliers† is as powerful as the name itself suggests. Gladwell has used the term â€Å"Outlier† to represent the successful people of the world. He talks of those

Leadership and Business Improvement Research Paper

Leadership and Business Improvement - Research Paper Example Leaders form an environment where people feel free to voice dissent. Leaders do this through actions. A leader does not fire people as they goofed, and in fact support dissent. Leaders have to reward people for differing, to reward modernism, and to ensure failure. Leaders link all these with forming a trusting atmosphere but most of the trust comes not from a fastidious technique, but from the character of the leader. To create trust, Leader needs to have following things.First, the leader has to have the capability. The employees have to trust his or her ability to do the job. Secondly, people are anxious with congruity that a leader is a person of reliability. If you are an effective leader, what you say is compatible with what you do, and that is similar to what you feel, and that sequentially is similar to your vision. Third, people desire a feeling that the leader is on their side that he or she will be stable. They want to distinguish that in the heat of battle; their leader w ill support them, protect them and endure with what they require to win. Lastly, leaders, they trust need to care about the lives of the people with whom they are working, need to understand with them. Leaders also show care concerning the illusions of his or her actions and the consequences of decisions. Capability, congruity, and loyalty, and being thoughtful is the quality a leader that must symbolize in order for trust to be formed in a group. It gets a long time to generate and maintain. It takes recurring interactions. Leaders are primarily the results leaning individuals in the world, and results get consideration. Their visions or objectives are persuasive and drag people toward them. Intensity coupled with obligation is alluring. These strong personalities do not have to force people to focus on; they are so intent on what they are doing that, like a child totally fascinated with creating a sand castle in a sandbox, they depict others in. All leaders can form a persuasive vision, one that takes people to a new place, and then interprets that vision into truth. Peter Drucker said that the first mission of a leader is to describe the vision. Max DePree , CEO of Herman Miller, wrote in Leadership Is an Art, "The first responsibility of a leader is to describe reality. The last is to say thank you. In between, the leader is a servant." (Warren G. Bennis, Joan Goldsmith, 1997) Primarily Vision grabs the leader, and the capability to communicate it eventually eases

Have technological developments undermined the truthful nature of Essay

Have technological developments undermined the truthful nature of photography or have they provided new creative possibilities - Essay Example In its earliest forms, due perhaps in large part to the fact that exposure times were lengthy as the technology was in its infancy, photography was used as a narrative form, but even this early in its history, technological developments were allowing for more creative expression than simply recording the ‘truthful’ image. â€Å"At the turn of the century [1900], a small group of serious photographers tried to rescue the art form from its low estate by turning their backs on the more blatant forms of narrative photography and its continued reliance on and subservience to painting. They sought a more independent poetic vision based on the camera lens and motivated by a concern with contemporary forms† (Brown, 1971: 31). Thus, while it might be said that â€Å"The new malleability of the image may eventually lead to a profound undermining of photography’s status as an inherently truthful pictorial form† (Ritchin, 1990: 28), the new technological develop ments offered to photography are merely the latest in a long line of photographic tools that can be used to explore new creative possibilities and/or provide truthful representation, based upon the decisions made by the photographer. At no point in its history can photography be said to have been limited to merely ‘true’ forms of capturing images. To understand this, it is first necessary to understand how the development of the digital camera is similar to the early development of the traditional camera and then to take a look at how each works to produce images which can be manipulated in various ways to arrive at an idea of ‘truth’. There is no doubt that the boom of available digital cameras and their immediate integration with desktop computers and other devices has been revolutionizing the photography industry. There are many physical advantages to going digital over more traditional methods. Although

Effects of Atmospheric Aerosols on Human Health

Effects of Atmospheric Aerosols on Human Health Abstract: A highly Sensitive (LOD; 0.04-0.4 ng/ml) method is developed for detection and quantification of acidic compounds (C3 -C10) containing mono and dicarboxylic acids on GC-MS. These compounds (C3 -C10) existed in trace amount, as secondary organic aerosols i.e. important constituents of Aerosols. Membrane extraction technique was utilized for selective enrichment (1-4300 times) of target compounds. Good repeatability (RSD% ≠¤ 10%) from selective organic phase (10% TOPO in DHE) was achieved with three phase HF-LPME. Aerosols containing samples, after Ultrasonic Assisted extraction were detected and quantified Through GC-MS. Effective derivatization of each target compound was performed with BSTFA reagent. Gas Chromatography, having capillary column and interfaced with mass spectrometry was used for separation, detection and quantification of target compounds. Method Development and Application -hollow fiber Supported liquid membrane extraction of Fatty acids (C3-C10) containing mono and dicarboxylic acids and Detection of aerosols Samples after ultrasonic assisted extraction. 1. Introduction: Impact of Atmospheric aerosols on human health and effect on radioactive stability in Earth’s atmosphere is getting importance now a days and this phenomenon has been well understood. [1]. Atmospheric aerosols can harm respiratory and cardiovascular system of human. Impact of Secondary organic aerosols as biogenic and anthropogenic antecedent is identified (Adams and sinfold, 2002) [1, 17]. Low molecular dicarboxylic acids (C3-C9) are also vital tracers of SOA [2]. Short chain fatty acids are found as secondary organic aerosols which are also supposed to derive from long chain fatty acids [1]. Importance of organic aerosol has been well established now a days and carboxylic acids are of great interest for environmental studies [1]. Several studies and mechanisms were proposed to understand the production of these SOA precursors [1]. Short chain carboxylic acids are found extensively in troposphere [2]. Secondary organic aerosols (SOA) are formed in the atmosphere by gas particles conversions. Organic matter present in aerosol contains more than 90% of troposphere’s aerosols [5, 15]. Dicarboxylic acids found in nature as polymeric compounds such as suberin and cutin [3]. Short chain dicarboxylic acids are found in vegetables [Siddiqui, 1989] and in soil containing micro organisms of durum wheat [4]. Dicarboxylic acids are found in plant oils which have greater interest for cosmetic and pharmaceutical industries [6]. Short chain dicarboxylic acids having aliphatic chain possess strong cyclotoxicity and antineoplastic activities [18]. Many analytical techniques are used to determine the composition of SOA so keeping in view these techniques new method for determination of fatty acids (common in SOA) has been developed. Membrane extraction is used in this method due to its increasing importance for high selectivity and high enrichment factor [24]. Dicarboxylic acids formed of bio oxidation of fatty acids so these are considered as metabolic part of fatty acid [42]. Dicarboxylic acids and their derivatives can be used to make polymers and their condensation with diols in solution produces high molecular weight polyester [39]. Additionally these dicarboxylic acids use less temperature in the reaction for the preparation of polyesters [39]. 1.1. Analytes Description: Properties (physical, chemical, etc.) of Compounds (C3-C10) containing mono and dicarboxylic acids are discussed in section; 1.1.1-1.1.12. These compounds (C3-C10) are the target analytes in this diploma project. These target analytes are extracted through Liquid phase micro extraction and detected by GC-MS system. Fig. 1.1-1.12 represents structures of target analytes (section; 1.1.1-1.1.12). 1.1.1- Adipic Acid Adipic acid is a product of lipid per oxidation. Adipic acid does not undergo hydrolysis in the environment perhaps due to the lack of hydrolysable functional groups (Harris 1990) [5]. 1.1.2- Malonic Acid: Malonic Acid is a metabolite of plants and tissues and Malonyle-CoA [28]. Malonic Acid is an intermediate for preparation of fatty acids from plants and other tissues [7]. Malonic acid is also present in aerosols [8]. Malonic acid is an important constituent of short chain fatty acids [8]. Malonic acid present in beet rots as a Calcium salt [42]. 1.1.3- Succinic Acid: Succinic acid is found in atmosphere as water soluble compound and as a compound of Secondary organic aerosols [29]. Succinic acid is a solid exists as crystals, anciently called spirit of amber. Succinic acid is an important intermediate in citric acid cycle which is very important constituent of living organism [42]. 1.1.4- Glutaric acid: Glutaric acid is found as SOA in aerosols [8]. Glutaric acid is sparingly soluble in water [41], can be used to prepare a plasticizer for polyester [41]. 1.1.5- Pimelic Acid: Pimelic acid is a last dicarboxylic acid relative to carbon number which has IUPAC name. Derivatives of Pimelic acid are used for biosynthesis of amino acid typically lysine [41]. Pimelic acid is produced, when Nitric acid is heated with Oleic acid as a secondary sublimation product which is not crystallized [20]. 1.1.6-Suberic Acid: Suberic acid is produced from suberine [8]. Suberic acid can also be obtained by vigorous reaction condition of natural oil with nitric acid [8]. 1.1.7-Azelaic Acid: Azelaic acid is an important constituent of secondary organic aerosols because it produces short chain fatty acids upon photo oxidation and also because it can be produced during oxidation of unsaturated acid that is found in Oleic acid [11]. 1.1.8- Cis-pinonic Acid: Cis-pinonic acid is also produced in atmosphere by photo oxidation of ÃŽ ±-pinene in the existence of Ozone [30]. 1.1.9- Pinic Acid: Pinic acid is derivative of ÃŽ ±-pinene. Pinic acid can be generated by photo oxidation of ÃŽ ±-pinene with Ozone as given in this chemical reaction; (C10H16 + 5/3 O3 -> C9H14O4 + HCHO). Pinic acid is present in a crystalline form used to prepare plasticizers [30]. 1.1.10- 4-Hydroxybenzoic Acid 4-Hydroxy benzoic acid is exists as crystals. It is used to derive parabens and can be used as antioxidant [41]. 1.1.11-Phthalic Acid: Phthalic acid is an aromatic dicarboxylic acid it is found as white crystalline state in pure form [41]. Phthalic acid is found abundantly in atmosphere and it has toxic properties. Aromatic acids are generally emitted through anthropogenic sources like reminiscent of solvent evaporation and Automobile exhaust [31]. 1.1.12-Syringic Acid. Syringic acid is found as humic substance in environment [40]. 1.2. Detection of Ultrasonic Assisted Extraction samples(UAE): A detection procedure by GC-MS is established with reference standard injections and UAE samples. A theoretical description is given in section 1.2 for â€Å"Ultrasonic assisted extractions†. Unknown real Samples from Aerosols containing mono and dicarboxylic acids (C 3-C 10) are provided after Ultrasonic assisted extraction [34]. 1.2.1- Ultrasonic Assisted Extraction: ‘Ultrasonic’ is derived from ultrasound. Ultrasound refers to a sound that has a higher frequency than a normal human can hear. This technique is used in chemistry in several aspects and due to application in chemistry it is known as Sonochemistry [23]. Ultra Sound is used in sample preparation in analytical chemistry like extraction, filtration, dissolution and sample purification. When Ultrasonic technique is used for assistance in extraction, this assistance in extraction is called â€Å"Ultrasonic assisted extraction† (UAE) [23]. There are many advantages by using UAE because it require less organic solvents ,non destructive, less expensive and less time consuming comparative to other sample preparation techniques like soxhlet [21]. The normal range of ultrasound frequencies used in laboratory ranges from 20 KHz to 40 KHz. Use of UAE is simple. A sample solution inside a vessel in an appropriate solvent can be placed inside ultrasonic bath at desired temperature and sound waves stir the sample [20]. The mechanism of US is as â€Å"when a sound source produces a high frequency waves, sample molecules starts vibrating and shift this vibration to other molecules of sample in a longitudinal direction when gas and liquid is used as a sample, while in solid sample both longitudinal and transverse waves can be produced† [19]. When UAE is utilized it increases speed of mass transport by vibration of mechanical transport from the sample matrix through a process called â€Å"cavitation† [21]. 1.2.2- Theory of Ultrasonic Assisted extraction: There are two theoretical aspects of sonication i.e. physical and chemical aspects in sample preparation. Physical and chemical aspects are described in section (1.2.2.1-1.2.2.2), in order to understand its practical use in analytical chemistry. 1.2.2.1- Physical aspects of UAE: During Ultrasonic assisted extraction, a bubble in a liquid cannot take energy (due to US) and implodes. On the other hand due to Ultra sound in liquid extractions, the cavitational pressure is shifted relatively higher so formation of bubble is difficult [21]. Ultrasonic intensity produces cavitations in a liquid sample during extraction (UAE). Two types of US cavitation is produced known as â€Å"transient cavitation† (produce transient bubble) and â€Å"permanent cavitation† [21]. The life time of transient bubble is so short that no mass transport or diffusion of gas is possible with in a sample [21]. Transient bubble is believed to be produced at US intensity (10 W/cm2) and permanent bubble at intensity (1-3 Watt/cm2). Sonochemical effects are intense inside the bubble because energy (numerous amounts) is produced during bubble eruption and production [21]. 1.2.1.2 Chemical aspects of UAE: When US radiation strikes a water molecule it produces free radicals OH* and H* due to collapsing cavitations’ bubble which exhibits high temperature and pressure inside and also many other radicals can be produced in solution [21]. Radical OH* is believed to be more stable and can begin many new reactions while H* radical is not stable. Second Sonochemical effect is pyrolytic reactions that occur inside bubble and can degrade compounds under analysis [21, 23]. 1.3. Liquid Phase microExtraction(lpme): The application of membrane extractions in analytical chemistry has taken the intentions of analysts during recent time. The goal of utilizing membrane extraction is to achieve high enrichment, selective extraction and environmental friendly procedure [24]. Small quantity of solvent (usually in micro liters) is required comparative to old techniques of extractions (soxlet) [24]. Clean extracts are obtained and after extraction, recovered compounds are shifted to another analytical instrument like Gas chromatography or liquid chromatography directly for further quantitative analysis [24]. 1.3.1 Hollow fiber membrane extraction: Two types of membrane are used in LPME. One membrane is flat sheet porous and second membrane is polypropylene hollow fiber. In this project polypropylene hollow fiber is used as a membrane support in membrane extractions due to limited cost and to reduce carry over problems [24]. 1.3.1.1 HF-LPME Technique: When a hollow fiber is used in LPME, this technique (LPME) is called hollow fiber liquid phase micro extraction (HF- LPME). In HF- LPME technique, a hollow fiber is used containing a thin film of immobilized liquid membrane inside the pores while the fiber is dipped into an aqueous phase containing objective analytes. Target analytes can transport through the membrane into a liquid filled inside the lumen of the fiber, which is termed as accepter solution [22]. Extraction of target analytes (C3-C10) was carried through three phase HF- LPME during whole of the project. Donor solution was contained analytes in aqueous medium, a suitable organic solvent i.e. Dihexyl ether (TOPO mixture) was used in pores of hollow fiber as a stationary liquid membrane support (SLM). Accepter solution was in aqueous medium [22].Target analytes were recovered into accepter phase after evaporation of water. Acetonitrile solvent was added in dried GC vial along with derivatizing reagent. After derivatization these samples were injected into a Gas chromatographic system. 1.3.2 Basic Principle of LPME: Basic principle is same for all LPME techniques (two phase or three phase LPME), the variation is only from accepter region [24]. In three phase liquid phase micro extraction technique (HF- LPME) a donor aqueous solution is filled in a vial or flask containing sample analytes. A short piece of hollow fiber is used and accepter solution is injected inside fiber through a micro syringe after injecting accepter solution one end is closed and other end contains syringe needle. Fiber containing solutions is inserted in an appropriate organic solvent having less polarity (Dihexyl ether) to create a stationary liquid membrane (SLM). Donor solution pH is adjusted such that it can restrain the ionization of target analytes [22]. The process of three phase extraction [22] can be explained as follows in Eq 1.1. Where ‘A’ is a target analyte, ‘K1’, ‘K2’, ‘K3’ and ‘K4’ are first order extraction rate constants. In order to obtain combined distribution coefficient, at equilibrium recovery, Eq. 1.2 is derived [22]. D accepter/sample = C eq accepter / C eq sample = C Org sample/ C eq accepter =ÃŽ ± D .Korg/sample / ÃŽ ± a. Korg/accepter†¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.1.2 In Eq. 1.2, C eq accepter, C eq sample and C Org sample are the concentration of analytes at equilibrium, in accepter phase, in aqueous sample phase and in organic membrane phase respectively.Here Korg/sample, Korg/accepter are the partition ratio’s between Organic phase and sample phase and between accepter phase and organic phase respectively [22]. ÃŽ ± D and ÃŽ ± a are the extractable fraction of total concentration of target analyte in sample and accepter respectively. If conditions are similar between sample and accepter, other than ionization of analytes in sample phase, from Eq. 1.2, equilibrium is independent from partition ratio of stationary liquid membrane in three phase lpme i.e. it depends mainly on ionization of analytes in sample [22]. Extraction efficiency (E) can be calculated from Eq. 1.3[22]. V sample, V accepter and V mem , in Eq. 1.3, are the volume of donor sample phase, aqueous accepter phase and organic immobilized membrane liquid phase respectively. D accepter/sample and D Org/sample are individual distribution coefficients relative to accepter phase to sample phase and Organic phase (SLM) to sample phase respectively [22]. Eq. 1.3 is derived for three phase lpme. It is evident; from the interpretation of Eq. 1.3 that efficiency is mainly controlled by individual distribution coefficients. Individual distribution ratios are directly dependent on partition coefficients, so by increasing the partition ratios efficiency can be improved [22]. Partition coefficients can be improved by properly adjusting the pH of donor and accepter and by using an appropriate organic solvent. Volume of sample and organic phase should also be kept minimum, according to Eq. 1.3 in order to develop efficiency [22]. 1.3.3-Mass transfer in LPME: Enrichment factor (Ee) for three phase LPME is given in Eq. 1.4. Ee = C accepter/C initial = V sample. E / V accepter †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. 1.4 In Eq. 1.4, C accepter is the concentration of target analyte, present in final stage inside accepter solution [22]. When an acidic analyte is ionized in aqueous solution, total extractable fraction of analyte (ÃŽ ±) is given in Eq. 1.5 [24]. ÃŽ ± = [AH]/ [A-][AH] = 1/[1+10(pH-pKa)] †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. 1.5 In the context of Eq. 1.3, the overall distribution constant (D) at equilibrium can be rearranged as given in Eq. 1.5 [24]. D = 1+10 s (pH-pKa) . KD /1 + 10 s (pH-pKa). KA †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. 1.6 ‘s’ is equal to 1 for acidic analytes (Eq. 1.6). ‘pKa’ is dissociation constant and pH refers to donor or accepter solution(Eq. 1.6) [24]. à ¢Ã‹â€ Ã¢â‚¬  C = ÃŽ ±D .Cs ÃŽ ±a CA.KA/KS †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦ 1.7 Eq. 1.5-1.7 are derived from Henderson-Hasselbalch relation, in this equation ÃŽ ± represents the extractable fraction of analytes [24]. The driving force for the extraction in neutral conditions of three phase LPME is the concentration gradient (à ¢Ã‹â€ Ã¢â‚¬  C) from sample to accepter [12]. The concentration gradient between two phases, between donor and accepter, is described in Eq. 1.7. K represent partition ratio of uncharged analyte between the membrane and aqueous phase. CA and Cs are the concentrations of analytes in accepter and sample phase respectively. 1.3.4 End point for extraction: Three end points are normally considered for extraction [22]. 1. Exhaustive extraction. 2. Kinetic extraction. 3. Equilibrium extraction. 1.3.4.1 Exhaustive extraction: Exhaustive end point is the specific end point (time), when all amount of analytes are exhausted (which can be practically possible) present in donor [22]. In this practical diploma work, Exhaustive end point will be applied in (LPME) extractions. Enrichment factor will increase by growing analyte concentration in accepter by the passage of time, at certain point it reaches a stable value [12]. Mass transfer between organic phase and liquid phase is dependent on concentration gradient [12]. Enrichment factor can be improved by increasing the value of ÃŽ ±D preferably close to unity and decreasing the value of ÃŽ ±A to zero. Such conditions for the ÃŽ ±D and ÃŽ ±A values are called â€Å"infinite sink† conditions, normally required for exhaustive extractions [22]. Situation close to these values can be achieved for acids by selective tuning the pKa values. For example for acidic compound if pH of accepter is adjusted, 3.3 (pH) units above than the pKa of acidic analytes this Di fference set the value of ÃŽ ±A to 0.0005, at this point accepter can capture all analytes. At this set value (ÃŽ ±A), enrichment factor increases linearly with time [12]. Peak time of enrichment factor, when other parameters are constant, can be calculated by comparison of CA maximum. CA maximum (‘CA’ is considered as time dependent) can be obtained by careful calculation of CA maximum values at a certain time, before this value starts to decrease again [12]. 1.3.5 Rate of LPME: Two parameters, govern the rate of extraction (when extraction approaches to equilibrium conditions), are membrane controlled extractions or diffusion controlled extractions [13, 24]. The maximum concentration Ee can be obtained when concentration gradient (à ¢Ã‹â€ Ã¢â‚¬  C) is approaches to zero described in Eq. 1.8 [13, 24]. Ee (max) = (C a / C d) max = ÃŽ ±D/ÃŽ ±A †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. 1.8 In membrane controlled extractions, the rate limiting step is the diffusion of target analytes. When analytes pass through the organic phase, the mass transfer (Km) is given in Eq. 1. 9 [13, 16]. Km  µ K.D m /h m †¦Ã¢â‚¬ ¦Ã¢â‚¬ ¦.. 1.9 In Eq. 1.9; K is partition coefficient, Dm is membrane diffusion coefficient and ‘h m ‘ is the thickness of membrane [13, 16]. 1.3.6 Addition of Trioctylphosphine oxide(TOPO): Mass transfer can be improved for acidic analytes by using different concentrations (w/v) of TOPO in organic solvent typically for short chain carboxylic acids. Interaction of TOPO with polar acids in solution takes place efficiently due to hydrogen bonding [16]. 1.3.7 Trapping of Analyte in Three phase lpme[24]: Concentration enrichment of analytes in three phase LPME can be achieved by stable mass transfer through the membrane to accepter phase. Back diffusion of analytes is prevented by trapping of analytes in accepter phase. In order to achieve high enrichment of acidic analytes pH of accepter phase is fixed enough basic so that when acidic analytes reached to the accepter solution becomes charged. Analytes could not be driven back to donor. So this trapping of analytes due to pH adjustment is called ‘’direct trapping’’. For high enrichment purpose, pH of accepter is usually adjusted 3.3 pH units higher than the pKa values of acidic target analytes while extracting from acidic donor. Buffer capacity of accepter should be sufficient such that during extraction protons from acidic donor cannot be neutralized by the concentration gradient between two aqueous phases during three phase lpme [24]. 1.3.8 Selection for Organic phase: Choice of organic solvent has basic importance in method validation because this solvent directly affect partition coefficient. Organic phase solvent should have low solubility in water [22] and low volatility to prevent solvent losses during extraction process [16]. Organic phase should have high distribution coefficient, between donor to organic phase and between organic to accepter phase, to achieve high enrichment. Organic phase should have adequate affinity to the hollow fiber. Organic phase should be immobilized sufficiently to cause efficient trapping of analytes in the pores through polarity matching [22]. Mixture of organic solvents can also be used as mobile phase [16]. In this project organic solvent is either pure DHE or DHE is also mixed with different amount of TOPO (section; 1.3.6) to achieve high stability of organic phase [22, 24]. 1.3.9 Agitation of sample: Extraction kinetics can be improved by agitation. Agitation increases analyte diffusion from donor to accepter. Organic membrane solution (DHE) is very stable inside pores of the membrane. Shaking by a magnetic stirrer helps analyte transfer from donor solution to the accepter solution [17]. When Donor solution containing analytes is stirred at high speed, probability of fresh solution contact with membrane phase is enhanced [9]. In order to enhance mass transfer all membrane extractions in this project are assisted through agitation by a magnetic stirrer. A membrane extraction assembly is shown in Fig. 1.13. 1.3.10Volume of donor and acceptor solutions. Volume of donor and accepter solution is very important because sensitivity can be improved by proper volume adjustment of accepter solution. Volume of accepter solution should be minimum comparative to donor to get better sensitivity [17]. Volume of accepter solution should be enough to be injected, detected and quantified by GC or HPLC. Volume of the accepter solution should be enough to fill lumen of hollow fiber appropriately [17]. 1.3.11 Adjustment of pH. Proper adjustment of pH of donor and accepter is very important because high partition ratio can be obtained in three phase lpme by proper adjustment of donor and accepter solution [17]. According to Eq. 1.7, Efficiency can be improved by increasing concentration gradient which depends mainly on pH. In this project three phase lpme is utilized on acidic analytes (C3-C9) containing carboxylic and hydroxyl groups so in donor solution pH is adjusted slightly lower than the pKa values of analytes to suppress ionization of these analytes [17]. 1.4. Detection and quantification of Analytes: 1.4.1-GC-MS analysis: GC-MS is a powerful detection technique for environmental trace analysis due to its high sensitivity [14]. Aerosols are existed in trace level so their detection requires a sensitive device with low limit of detection. GC-MS suffers less matrix effect and is usually cost effective and highly selective [14]. Analytes are separated according to their charge to mass (m/e) ratio after passing through mass spectrometer. Scan mode is used for identification of each analyte [14]. When gaseous analytes come to mass spectrometer they are converted to their respective molecular ions. Electron ionization in mass spectrometer strikes molecules to fragments [18]. These molecular ions are specific for each analyte and sensitivity and selectivity can be improved through selected ion chromatogram (SIM) [14]. Signal to noise ratio (SNR) is improved through extracted ion chromatogram (XIC) which is selected through SIM mode [14]. SIM mode is used for qualitative and quantitative analysis [14]. Analytes (C3-C10) are polar and non volatile, so these analytes cannot be detected in pure form and separated by using Gas chromatographic column. A derivatization step is necessary to convert Analyte into volatile substances. Derivatization is made to convert carboxylic and hydroxyl functional groups to their respective ester functional group [14]. 1.5. Derivatization: Two derivatization reagents; ‘’N, O-bis(trimethylsilyl) trifluoroacetamide’’ (BSTFA) and ‘’N-(tertbutyldimethylsilyl)-N-methyltrifluoroacetamide’’ (MSTFA) are commonly used for esterification of hydroxyl and carboxylic functional groups before injecting to GC-MS system[14]. Both derivatizing reagents are applied separately and compared prior to GC-MS analysis. 1.5.1- Silylation: Analytes containing carboxylic acids (C3-C10) are introduced to GC-MS after derivatization. Carboxylic acids are converted to their respective trimethyl silyl ester (TMS derivative) by BSTFA. A nucleuphilic attack is taken place by a hetero atom to silicon atom when BSTFA reagent is used as a derivatization reagent [14]. BSTFA is found very efficient to convert hydroxyl groups to respective Silyl ester [18]. Advantage with BSTFA is that its derivative can be injected directly without purification and it can be used for very sensitive detection [18]. BSTFA is non polar and its efficiency can be improved by using BSTFA in Acetonitrile [32]. Chemical structure of BSTFA is shown in Fig [1.14] below. Due to the use of BSTFA reagent in the reaction, a common peak is appeared at m/z= 73, due to [Si(CH3)3]+ molecular ion and at m/z=145 due to [OH=Si(CH3)2]+ molecular ion . when Analytes containing dicarboxylic acids are used for MS analysis, Ion peak is appeared at m/z=147. Ion peak at m/z=147 is appeared due to the [(CH3)2Si=Si(CH3)2]+ molecular ion [18]. 2. Method: 2.1 Membrane extraction: Three phase HF- LPME method is used for extraction. Section 2.1 describes the method for three phase hollow fiber liquid phase micro extraction technique. 2.1.1 Equipment and reagents for Membrane Extraction: Hollow fiber Accurel PP polypropylene (Q3/2) is purchased from Membrana (Wuppertal, Germany). The wall thickness of membrane is 200  µm, Inner diameter 600  µm and pore size is 0.2  µm. Before extraction a 7.5 cm membrane was cut carefully with a fine cutter. After cutting membrane was washed in acetone and dried overnight. A magnetic stirrer, containing multiple stations, model (Ika-werke, Germany) was used for agitation of donor solution. Micro Syringe 50  µl (Agilent, Australia) was used to push accepter solution inside the lumen of membrane and for holding of membrane. pH meter (Mettler Toledo) was used to measure pH for donor and accepter solution. Volumetric flask (Kebo, Germany) was used for extractions (contain donor solution). Milli-Q water was obtained from Millipore gradient system (Millipore, USA). Hydrochloric acid (37%, Fluka) and Sodium hydroxide monohydrate (Fluka) were used to prepare further solutions. Dihexyl ether (97%) was purchased from Sigma Aldrich. TOPO (99%; Aldrich) was used to prepare solutions in DHE (%, w/v). 2.1.2Set up for Membrane Extraction: 2.1.2.1 Donor solution: The pH donor solution was adjusted to 2. All aqueous solutions were prepared in mill Q water and pH was adjusted by adding HCl (0.1M). All Samples were spiked in a dried 100 ml volumetric flask (Germany). This flask was then, filled up to mark with donor solution. Further 5 ml of donor solution was added in same flask in order to dip membrane inside donor solution. Total volume of donor solution was adjusted to 105 ml. A clean magnet was dropped in flask and then, this spiked solution inside the flask was allowed to stir for 30 minutes and at a fixed revolutions/min (800 rpm) of magnetic stirrer. 2.1.2.2 Accepter solution: Accepter solution was prepared in milli Q water and pH 12 was adjusted by Sodium hydroxide (0.5 M, 5 M). The accepter solution was injected inside lumen of dried membrane through a micro syringe. Specific amount of (24  µl) accepter solution was injected inside lumen of hollow fiber via a BD micro syringe. Specific volume (24  µl) of accepter solution was fixed after several adjustments, for best compatibility with a 7.5 cm hollow fiber, to achieve good repeatability and enrichment. 2.1.2.3 Membrane solvent: Membrane containing accepter solution was dipped for 15 s (Approximately) into the organic solvent (pure DHE or topo% solutions in DHE), to impregnate the fiber with organic solvent and to establish a membrane phase. The solvents, immobilized in the pores of hollow fiber were; pure DHE, 1% topo in DHE (w/v), 5% topo in DHE (w/v), 10% topo in DHE (w/v), 15% topo in DHE (w/v) and 19% topo in DHE (w/v). All solutions (topo in DHE) were prepared and mixed by manual shaking, although 15% topo in DHE and 19% topo in DHE solutions were prepared by vigorous shaking and were put inside sonicator for efficient mixing. 2.2. Sample preparations: All primary solutions were prepared in methanol. Primary solutions were prepared by transferring specific weight of analytes to a sample vial, having air tight caps. This solution was diluted with methanol to prepare a solution of concentration (100 ÃŽ ¼g/ml). Table 2.1 represents properties (physical, chemical) of analytes. A (abbreviation) name was given respective to TMS ester of each analyte, new name consists of three words only. Molecular weight (Mw), Molecular (Molec) formula, Source (chemicals were purchased from), pKa values of individual analytes (dissociates in water) and purity (as labeled on each chemical) of each analyte is listed in Table 2.1. Table. 2.1- Analytes source (purchased from)and purity. Sr. No Chemical name Abbreviation Mw Molec formula Purchased from pka. Values Purity (%) 1 Malonic Acid Mal 104.06 C3H4O4 Aldrich 2.83, 5.69 (36) 99 2 Succinic Acid Suc 118.09 C5H6O4 Fluka 4.19, 5.48 (36) 99.9 3 Glutaric Acid Glu 132.04 C5H8O4 Aldrich 4.34, 5.42 (36) 99 4 Adipic Acid Ad 146.14 C6H10O4 Fluka 4.34,5.44 (36) 99.5 5 Pimelic Acid Pim 160.17 C7H12O4 Aldrich 4.48, 5.42 (36) 98 6 Suberic Acid

Freedom and Equality in the Comparison of Political Systems Essay examp

Freedom and Equality in the Comparison of Political Systems ABSTRACT: The notions of freedom and equality in a group are precisely defined in terms of individual exertions of influence or power. Freedom is discussed in the version ‘freedom from’ influence rather than in the version ‘freedom to do’ what one wants. It is shown that at the ideal conceptual level complete freedom implies equality. Given the plausibility of the definitions this shows that political ‘folk rhetorics’ in which freedom and equality often are put in opposition are misled and misleading. Quantitative notions of ‘more freedom’ and ‘more equality’ are introduced and shown to be independent of each other. The bearing of these conceptual exercises on the comparison of political systems is discussed. During the last 5000 years the competition and contest of large, human communities or political systems, of which modern states are the pressing example, often was decided by a simple, `evolutionary' mechanism: war and force. However, the increasing destructive power of artifacts which are developed with the help of scientific knowledge seems to diminish the importance of this device—at least among communities with a somewhat rational leadership. For the mere use of modern techniques increases the risk of self-destruction even for that party which otherwise would be said to have won the `contest'. In this situation it would be desirable to have other, less violent criteria to check whether some political system is better than another one. If we could compare the quality of political systems in a purely conceptual way the practical competition among systems could be reduced to attempts at enlightening the citizens of the respective other system. Recent views... ...y remain unchanged. In particular this shows that freedom and equality—even if both are defined in terms of power—yield different criteria for the ranking of political systems. The fact that both these notions can be defined in terms of power does not imply that the comparison of political systems in these two dimensions can be `reduced' to one, more basic criterion formulated in terms of exertions of power. References W.Balzer, 1990: "A Basic Model of Social Institutions," Journal of Mathematical Sociology 16, 1-29. W.Balzer, 1993: Soziale Institutionen, Berlin: de Gruyter. W.Balzer, 1994: "Exchange versus Influence: A Case of Idealization," in B.Hamminga (ed.), Idealization VI: Idealization in Economics, Poznan Studies in the Philosophy of the Sciences and the Humanities Vol 38, Amsterdam: Rodopi, 189-203. S.Lukes, 1974: Power: A Radical View, London.

Oracle of Truth

Claim: While delivering the commencement speech at Yale University in 2000, Oracle CEO Larry Ellison said: â€Å"Graduates of Yale University, I apologize if you have endured this type of prologue before, but I want you to do something for me. Please, take a good look around you. Look at the classmate on your left. Look at the classmate on your right. Now, consider this: five years from now, 10 years from now, even 30 years from now, odds are the person on your left is going to be a loser. The person on your right, meanwhile, will also be a loser. And you, in the middle?What can you expect? Loser. Loserhood. Loser Cum Laude. † Status: False. Origins: In July 2000, an inventive story about Oracle CEO Larry Ellison bestowing an unusual commencement speech upon the graduating class of Yale University began popping up in various inboxes. Some were left wondering if this could be the real thing, given what is known of Ellison's famed ego, and because the wide circulation of the 199 7 Kurt Vonnegut commencement speech hoax had prepared the way for this piece to sound plausible. In truth, Ellison did not give a such a speech at Yale, nor anywhere else.The article was the fanciful creation of Andrew Marlatt, a writer for the satire website, SatireWire. It was reprinted (with SatireWire's express permission) on BBspot, another satirical web site. The full text of the piece: ELLISON TO GRADS: DIPLOMAS ARE FOR LOSERS Oracle CEO Urges Students to Drop out, Start up NEW HAVEN, CONN. (SatireWire. com) – In one of the more controversial commencement addresses in memory, Oracle CEO and college dropout Larry Ellison told Yale's Class of 2000 they were â€Å"losers† whose hard-won diplomas would never propel them into the ranks of the super rich.The evangelical Ellison, noting that college dropouts Bill Gates, Paul Allen, and Michael Dell were, like himself, on Forbes' recent top 10 list of billionaires, urged freshmen and sophomores at the ceremony to  "drop out and start up,† and added that the undereducated Yale security guards who ushered him off stage probably had a better shot at uber-wealth than graduating seniors. What follows is a transcript of the speech delivered by Ellison at the Yale University last month: Graduates of Yale University, I apologize if you have endured this type of prologue before, but I want you to do something for me.Please, take a ood look around you. snopes. com: Larry Ellison ‘Loser' Commencement Speech http://www. snopes. com/quotes/ellison. asp? print=y ? 1 3? 2012/9/21 10:41 Look at the classmate on your left. Look at the classmate on your right. Now, consider this: five years from now, 10 years from now, even 30 years from now, odds are the person on your left is going to be a loser. The person on your right, meanwhile, will also be a loser. And you, in the middle? What can you expect? Loser. Loserhood. Loser Cum Laude. â€Å"In fact, as I look out before me today, I don't see a th ousand hopes for a bright tomorrow.I don't see a thousand future leaders in a thousand industries. I see a thousand losers. â€Å"You're upset. That's understandable. After all, how can I, Lawrence ‘Larry' Ellison, college dropout, have the audacity to spout such heresy to the graduating class of one of the nation's most prestigious institutions? I'll tell you why. Because I, Lawrence â€Å"Larry† Ellison, second richest man on the planet, am a college dropout, and you are not. â€Å"Because Bill Gates, richest man on the planet — for now, anyway — is a college dropout, and you are not. â€Å"Because Paul Allen, the third richest man on the planet, dropped out of college, and you did not. And for good measure, because Michael Dell, No. 9 on the list and moving up fast, is a college dropout, and you, yet again, are not. â€Å"Hmm . . . you're very upset. That's understandable. So let me stroke your egos for a moment by pointing out, quite sincerely, tha t your diplomas were not attained in vain. Most of you, I imagine, have spent four to five years here, and in many ways what you've learned and endured will serve you well in the years ahead. You've established good work habits. You've established a network of people that will help you down the road. And you've established what will be lifelong relationships with the word ‘therapy. All that of is good. For in truth, you will need that network. You will need those strong work habits. You will need that therapy. â€Å"You will need them because you didn't drop out, and so you will never be among the richest people in the world. Oh sure, you may, perhaps, work your way up to No. 10 or No. 11, like Steve Ballmer. But then, I don't have to tell you who he really works for, do I? And for the record, he dropped out of grad school. Bit of a late bloomer. â€Å"Finally, I realize that many of you, and hopefully by now most of you, are wondering, ‘Is there anything I can do?Is t here any hope for me at all? ‘ Actually, no. It's too late. You've absorbed too much, think you know too much. You're not 19 anymore. You have a built-in cap, and I'm not referring to the mortar boards on your heads. â€Å"Hmm†¦ you're really very upset. That's understandable. So perhaps this would be a good time to bring up the silver lining. Not for you, Class of '00. You are a write-off, so I'll let you slink off to your pathetic $200,000-a-year jobs, where your checks will be signed by former classmates who dropped out two years ago. â€Å"Instead, I want to give hope to any underclassmen here today.I say to you, and I can't stress this enough: leave. Pack your things and your ideas and don't come back. Drop out. Start up. â€Å"For I can tell you that a cap and gown will keep you down just as surely as these security guards dragging me off this stage are keeping me down . . . † The last line of the piece should have given away the joke, if nothing else did. Larry Ellison being dragged off a stage is a satisfying mental image to contemplate and provides snopes. com: Larry Ellison ‘Loser' Commencement Speech http://www. snopes. com/quotes/ellison. asp? print=y ? 2 ? 2012/9/21 10:41 a wonderful closing for a piece that would otherwise be difficult to orchestrate an ending for, but that's all it ever could be, even if Ellison had addressed the Yale Class of 2000 and had given that speech. (Which, by the way, he hadn't). Venerable institutions of higher learning have at times chosen keynote speakers they've later had cause to regret. The price of turning the podium over to another is having to listen politely to the entirety of his address, even if it is offensive. Audiences are still expected to clap at its culmination, and hoever introduced the speaker is still on the hook for thanking him for his insights. Such are the demands of a polite society, with security guards standing poised to remove invited guests who give voice to unpo pular sentiments not figuring anywhere into the equation. Should there still be any remnant of doubt about the veracity of the article in question, Yale didn't have a guest speaker at its 299th graduation ceremony, held in May 2000. Yale seniors received a more personal address on Class Day, another part of this two-day commencement ceremony.The keynote speaker for that event was Bob Woodward, who graduated from Yale in 1965. (His investigation of the Watergate break-in helped win a Pulitzer Prize for The Washington Post in 1973. ) Larry Ellison is a prime choice for such lampooning because this thrice-married, thricedivorced multimillionaire is known for living larger than life. A 1997 unofficial biography was titled The Difference Between God and Larry Ellison: God Doesn't Think He is Larry Ellison. Barbara â€Å"leisure unsuited larry† Mikkelson Additional Information: SatireWire BBSpot Last updated:

Cellular Mobile System Capacity influenced by Handoff protection strategies The WritePass Journal

Cellular Mobile System Capacity influenced by Handoff protection strategies ABSTRACT: Cellular Mobile System Capacity influenced by Handoff protection strategies ABSTRACT:INTRODUCTION:1. BACKGROUNDS:1.1 PROBLEM DESCRIPTION:2. Current status and development of research:2.1 Literature survey:2.2 EVALUVATION:2.3 OUTLOOK:REFERENCES:Related ABSTRACT: Today, there   is a large number of mobile user groups and In that, the need of   service of mobile user group   plays a great dispute on the utilization of bandwidth. The radio frequency spectrum is an inadequate resource, to improve service quality and system capacity radio spectrum should be carefully planned. Research is carried out to improve system capacity and service quality. Admission capability is highlighted by the system capacity and the service quality relates to the connection continuity. This proposal reveals the impact of protection, which is used to improve   the strength of the   capacity of cellular mobile systems. Traffic model is established by using the mobility characteristics of the real world. The relation between admission capability and channel reservation is given by the markov’s approach. The proposed dynamic reservation scheme is proposed to provide handoff coordination between the service quality and system capacity. INTRODUCTION: The evolution of cellular mobile systems began with the first generation (1G) cellular systems introduction, and pass on through second generation (2G) and continuing third generation (3G ), featuring the development into the fourth generation (4G) systems. This generation systems are divided based upon the coding, modulation, and multiple access techniques which are used. First public mobile telephone system (MTS) began operation in 25 American cities. In this system contains an efficient transmitter on tall building with in the city and the   permanent single channel is assigned to mobile cellular phone   for sending and receiving data through the concept of push-to-talk. Late 1960s, improved MTS(IMTS) implemented and dual channels for sending and receiving the data. In the starting of   cellular mobile systems there very few number of users. In New York, 12 calls only simultaneously supported over 1000 square mile area. In 1968, Bell laboratories demonstrated the concept of   cellular system. In the cellular concept contains 2-way communication. This type of communication used hexagonal , N-cell frequency reuse pattern by using the intracellular mobile stations (MS), which are controlled by a base station (BS). The factors which improve the capacity of cellular system are handoff, frequency reuse and sectorization . By decreasing the power of BS in the cell, in another BS the particular frequency can be reused which is remotely far away. Handoff between stations intensively increases the flexibility provided to the customer. This in turn improves the capacity and user access area is also expanded. signal processing technology   and very large scale integration (VLSI) were   developed in 1980s, which paved the route for the digital era. In this generation digital signal processor are used for the 2G cellular. ASICs are used, which reduced the size of mobile phones and new signal processing   features. Second generation systems are of digital nature, which offered   elementary data services and improved voice quality compared to that of previous generation. 2G systems were designed for the improvement of communication. In 1G radio signals are analog where as in 2G systems radio signals are digital. 2G systems are mainly developed into the CDMA and TDMA systems based on the type of multiplexing is used. in less popular areas digital signals are not reaching the tower. In digital signal call completely fails to connect when the signal strength is less, where as in analog systems it used to gradually drop. 3G is the generation of mobile phones and telecommunications. In 3G different countries used different types of radio interfaces. Mainly used radio interface is W-CDMA, FDMA is also used in this generation. 3G has various application such as mobile tv, video demand, video conferencing etc. In this generation the users increased enormously, the demand for channels also increased. The main impact on the system capacity and quality of service provided by the service provider. Researches where conducted to increase the system capacity and to decrease the call failing during the handoff. The main issue of the mobile system is the design. Radio spectrum is limited, which must be shared by several users. Each is cell is allocated with the portion of the total frequency of the spectrum. Users in the particular cell can use the channel allocated to that cell. Different cells can use the same channel separated by the minimum distance between the cells because to reduce the co-channel interference. There are three types of channel allocation techniques, they are fixed channel allocation, dynamic channel allocation, hybrid channel allocation. 1. BACKGROUNDS: In cellular systems, the number of mobile systems under a base station is random and time varying. The users of mobile systems move between cells, so there will be variations in the number of users under the particular base station. So there are lots of variations which causes the traffic and handoff of mobile systems. In the third generation mobile communication systems there is lot of research work is carrying. The objective of the research is to offer personalized and integrated services for the mobile users with the service quality than that of fixed users. In the third generation there is lot of demand for the personal communication, there is explosive growth of the user community because its available for affordable price. Increase in the   mobile customers and the   need   of   diversity   will be a great challenge to utilize the bandwidth. The radio spectrum is limited it should be carefully planned for the usage. The research work on radio channel allocation mainly focuses on the admission capability and connection continuity. It gives out the compressed channel exploitation , which in turn maximizes the number of channels. If there is any special variation in requirement of the service, full admission capacity can’t   be achieved by fixed channel allocation [1]. We are considering the dynamic channel allocation (DCA)[2]due to this service request imbalance. In DCA, channels are allocated according to the service requests distribution and load sharing also improve the   user admission capacity. 1.1 PROBLEM DESCRIPTION: The initial connection requests to start new calls are considered to improve the user accommodation capability. Accommodation capacity is based upon the admission capability of new user. Since the user moves around, its needed to establish the connection many number of times with in a single call duration. The user accommodation capacity also depends upon the connection continuity. Impulsive call break takes place when a cellular mobile user transfers from its serving cell into a new one [8], but it is not sure that channel is assigned in the different cell to remain in connection. Protecting the connection continuity is studied extensively. The basic techniques which are used to establish connection continuity for mobile users include guard channel[3], predictive channel reservation and handoff queuing. The other techniques of   handoff   protection are subrating, channel sharing and channel carrying [4]. Handoff protection strategy acquire pessimistic effect on the new user admission. The intake of new users in to the system are reduced by the priority based handoff protection schemes   such as guard channel, handoff queuing, and predictive channel reservation. particular portion of the available channels are confined to only the new users by the Guard channel , so guard channel elimination on the new user admission is apparent. Smaller impact on the new user admission is the advantage of handoff queuing over the guard channel. Assume, both handoff queuing and guard channel techniques contains the equal number of   nominal channels, the over lapping cell structure infatuated by handoff queuing, which   leads to the higher   channel density than guard channel. So the minimum impact of the channel queuing can be attributed to the increase number of nominal channels. To differentiate   these   techniques, let us observe the case   which is   similar channel set is deploy ed to envelop the same service area with implementation of   the two strategies respectively. The cell Overlapping layout demands a huge amount of the reuse factor in order to continue the co-channel interference distance, compared to that of guard channel strategy   only fewer nominal channels per cell present in the handoff queuing strategy, since the other technique does not need   the cell overlapping structure. Both the number of guard channels and non-guard channels may be equal. Equal level of handoff protection can be achieved by substituting guarded channels for handoff queuing. Due to exchange problems in handoff queuing , new call admission capability and handoff protection cont be realized. though reservation channels are not properly used, new users are blocked by the predictive channel reservation. New user admission capability consists of some   disadvantages because of handoff protection. In order to over come these constrains researches investigated chances for better providing handoff protection. In [5] Oh and Tcha introduced the division of nominal channels to protect and unprotect channel sets in order to minimize the handoff failure. Therefore a predefined grade of service satisfies the expected results for the   above proposed division of nominal channels. The functioning of handoff protection and new user admission is affected due to adding or removing the guard channels. If the handoff requests are less then the new users access guard channel because of dynamic channel allocation[7]. 2. Current status and development of research: 2.1 Literature survey: If   an user being engaged in a call connection, then he said to be active. The   number of   factors influence the active time that include walking or driving, speed, impediment and delay at street intersections, traffic density around, shopping intensions and so on. For this dwelling time   negative exponential function is good approximation to the probability distribution   through the assumption of various factors. when an active mobile user   found to be approaching cell boundary, then the   Channel reservation for handoff   is conducted. The speed and position of active mobile user are monitored to calculate the remaining time left connection with the particular current cell. If the remaining time falls below threshold is known as channel reservation interval ( CRI). After confirming the the intention of transfer of the call to the new cell, target cell receives the request for the channel reservation. if there is any ideal channel in the target cell then it is reserved and it is known as locked which means temporarily it cont be used by any other. If in the target cell does not contain any free channels then the reservation request will be in a queue. After   channel is emptied   in the target cell, the request queue searches   to find any requests which are to be processed. The   request   leaves the queue by assigning it to the free channel. A released channel remains to be free until next channel requests for it when an queue is empty. After sending the reservation request the mobile user can end this current call connection. In this situation the target cell receives reservation cancellation request from the user. After receiving a cancellation request the locked channel will be released by the the target cell after processing corresponding reservation request. We assume CRI to be accurate enough that call completion is the single account for a mobile user not to show up at ending of the CRI. If channel has been reserved to take it over or blocked for mobile user, then the target cell handoff will be successful. Whereas in the previous cases the mobile user continues its call on the new channel until leaving or call completion while in the later on into termination [8], since new call is not prioritized, if a free channel exists then new user will be accepted or else it is blocked and cleared from the system. The follo wing figure describes the working process of reservation admission in the flowchart. Markov Approach   Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚  Ã‚   A markov model is implemented for analysis of the some of active channels and the number of reservation requests which are to be processed. Consider   for each cell C   number of channels are allocated   and buffer size limit for requesting queue is S. The transition rates of the neighbouring channels are obtained as follows. Before channel reduction new calls and handoff calls are entertained, consider the gross arrival rate as the transition rate.   When a handoff call reserves one channel for later use, immediately new call takes one channel for the later use. Whenever all channels have been occupied new call is rejected and reservation request is queued upto maximum length of S, which in result get a transition rate equal to the arrival rate of the channel reservation requests only. Reservation of a channel extends the channel holding time from channel utilization interval(CUI) to channel occupation interval (COI). COI is also assumed that it is exponentially distributed, the mean value of which is obtained by[8] The expected value of the inactive period of a reserved channel before the   utilization of channel is known as the dormant period, dormant period is stated dependent that longer dormancy can be expected and written as [8] The average dormant time on state n is given as [8] Let Fx(t) is considered as the cpd (Cumulative probability distribution ) of the time interval before the ( X + 1)th channel release. The Fx(t) can be written as Fx(t) [8] We   canapproximate the sojurn of a request in the queue, which has   to be exponentially distributed to give out a time independent request. The   living rate that has the value equal to 1/Tcri. The state probabilities are given by 2.2 EVALUVATION: Traffic model supports assures mobility properties and certain geometry in real-world cell plan. Where as manhattan model considers a classic city scenario which is regarded as by the   association of buildings, big structures with streets. In the manhattan model the connection distracts, when a mobile user roams in the streets, a street corner and suffers a sharp signal strength path loss. Handoff protection with prudent channel usage decreases the user accommodation capacity. In the markov approach, accommodation capacity is evaluvated by using the single over the entire system. 2.3 OUTLOOK: In this paper, we have discussed the impact of   on capacity of the cellular mobile systems by the channel reservation. A user should receive un disrupted service through out the life time   after admission which is known as capacity. By using the handoff protection, capability of new user admission increases to that of connection continuity. user accommodation capacity is weakened by handoff protection. Which indicates system capacity and service quality are conflicting objectives. So tradeoff is cont be eliminated. Our further research to be carried out on channel reservation with out degrading the system capacity REFERENCES: [1] S.Jordan and A.Khan, â€Å"A Performance bound on dynamic channel allocation in cellular systems: equal load†. [2] D.Everitt and N. MacFayden, â€Å"analysis of multicellular mobile radio telephone systems with loss.† [3] K. Yeung and T.S. Yum, â€Å"Compact pattern based dynamic channel assignment for cellular mobile systems.† [4] â€Å"channel carrying: A novel handoff scheme for mobile cellular networks.† [5] S. H. Oh and D. W. Tcha, â€Å"prioritized channel assignment in a cellular radio network.† [6] F. A. Cruz-Perez, D. Lara-Rodriguez and M. Lara â€Å" fractional channel reservation in mobile communication systems.† [7] Y. C. Kim, D. E. Lee, B. J. Lee, Y. S. Kim, and B. Mukherjee, â€Å"Dynamic channel reservation based on mobility in wireless ATM networks.† [8] Yi Xu, Quan Long Ding, Chi Chung Ko, â€Å"impact of handoff protection strategies on cellular mobile system capacity.†

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