A reflection of Being and Nothingness and Woman as the Other Free Essay Example, 2000 words

Even in the modern world, a woman is immensely weak, though feminist movements have in the recent past attempted to reverse the trend. Though society is conscious of the imperative role played by women, men tend to look away from their achievements. Beauvoir implies that the sex that wields more authority, usually the subject and the absolute males, have access to better opportunities, and resources to support their endeavors. However, for women, they are grappling with the adverse effects of being in nothingness. I consider this as driven by the notion that men have historically been identified as the absolute human, the most influential, the best in skill and intellect, most important, and usually successful in the world. Although women have such abilities as well, the society has discriminated against them and pushed them to the lower social pedestal. Females are just the weaker human persons that came to be after the absolute man. Owing to the infringement on women s liber ties, they suffer more in society due to lack of or inadequate education, and harsher economic opportunities. In that literature, Jean-Paul Sartre tries to elucidate an issue which many philosophers overlooked. We will write a custom essay sample on A reflection of Being and Nothingness and Woman as the Other or any topic specifically for you Only $17.96 $11.86/page Nonetheless, Kant did not perceive a processing of a variety and the planning event.

Bullying Teenagers are more Likely to Commit Suicide...

What would you do if you were constantly being made fun of every time you walked into school? What if you found out that your parents were keeping a big secret from you, and when they told you, it made you want to kill yourself? If you had a chance to stop all the lies and secrets and bullying, would you take it. Many teenagers die every year because of suicides. For every death, there is always a reason why. Why would innocent teenagers just suddenly decide to kill themselves? The reason is this: they deal with so many issues at home, that it just got too far and they couldn’t handle it anymore. Family issues is one of the big reasons why teens commit suicide. Many students can’t handle being bullied.There are tons of reports of students†¦show more content†¦When a teenager is picked on and bullied, it makes them feel worthless and that everything would be better if they were gone. When you bully someone, you’re making them weaker and weaker, and pretty soon it could be so bad that they can’t take it anymore. That’s when they start thinking of options to make it end. Suicide! Teenagers are more likely to commit suicide than kids. Suicide is the third leading cause of teenage deaths every year. Every single day of every single year, a teenager commits or attempts suicide. Imagine how many teens that would be! Suicide also have some effects. They can have an impact on at least six other people. It could be their family or friends. At www.dosomething.org, it says that nearly 30,000 teenagers commit suicide every year. That’s a lot! There are things you can do to prevent your teenager from committing suicide. Make them feel like they’re important to everyone, and that they mean a lot to them. Try and convince them that suicide doesn’t solve any problems. Think of some ways why suicide is the worst way to die. They need to feel like you care about them. Make a big deal out of them trying to commit suicide. Do something that will make them rethink about their decisions. Never leave them alone in a room with dangerous objects that they can harm themselves with. Reassure them that everything is going to be okay and that they can get the help they need. Tell their friends and other family memberShow MoreRelatedInformative speech outline Essay1391 Words   |  6 Pagesï » ¿Title: Suicide Among Teenagers Specific purpose: To inform my audience on some of the causes on teen suicides.    I. Introduction A. Attention Material: It has been verified on April 19th, 2013 by the Center for Disease Control that for youths between the ages of 10-24, suicide is the third leading cause for death in the United States. (Center for Disease Control: Teen Suicide Statistics, Chart number 1) B. Tie to the audience: Teenagers taking their own life has always been an idea hardRead MoreEffects Of Bullying On Kids : Do Actions Speak Louder Than Words? How Much Harm?1620 Words   |  7 PagesEffects of Bullying on Kids Do actions speak louder than words? How much harm can a word produce? Loser. Fatty. Nerd. Nobody. Worthless. Bullying has always been an issue in childhood and high school, but it isn t until this decade that the spotlight has really focused on the damage it produces in a child s life. In the past, adults just thought bullying was an innocent way kids expressed their feelings but now we have seen the true darkness in this problem. In 2007, almost a third of kids in middleRead MoreBullying and Teen Suicide Essay779 Words   |  4 Pages Lives are slowly being lost due to suicide and not only is it affecting themselves but also the people who are around them. Suicide is defined as taking of one’s own life and it is an issue that should be given all attention to. Teen suicide has been talked about in every source of media and it still continues to have a harmful effect in todays generation. In the United States the eighth leading cause of death is suicide, within developing teens, suicide is the third leading cause of their deathsRead MoreTeen Suicide, Depressing Isn t It? If You Only Knew?1158 Words   |  5 PagesTeen Suicide, Depressing Isn’t It? If You Only Knew †¦ According to Merriam-Webster online dictionary, suicide is a noun defined as the act of taking your own life because you do not want to continue living. Teenage is a noun defined as relating to people who are between thirteen and nineteen years old (Merriam-Webster). Several factors can lead to a teenager making the decision to commit suicide. When it does happen or an attempt is made, it can be very difficult to pinpoint the reason(s). TeensRead MoreCorrelation Between Suicide Rates And Cyberbullying1292 Words   |  6 PagesEmily Gray Cervelloni Eng 121, Section 3 26 September 2016 Correlation Between Suicide Rates and Cyberbullying The 21st Century is roaring, and the use of technology sweeps across the nation like a pandemic. The American lifestyle is being consumed by electronics. Due to the increase of technology, childhood is rapidly transforming and evolving. No longer do children only thrive in fresh air and on playdates, but also with tech savvy gadgets and computers. Children are currently part of a digitalRead MoreCorrelation Between Suicide Rates And Cyberbullying1332 Words   |  6 PagesCorrelation Between Suicide Rates and Cyberbullying The twenty first century is roaring, and the use of technology sweeps across the nation like a pandemic. The American lifestyle is being consumed by electronics. Due to the increase of technology, childhood is rapidly transforming and evolving. No longer do children only thrive in fresh air and on playdates, but also with tech savvy gadgets and computers. Children are currently part of a digital generation that has sprouted in a world immersedRead MoreBullying And Its Effects On American Schools1209 Words   |  5 PagesBullying in American schools has become an underrated topic to converse about. It is a worldwide problem that can have negative consequences for the general school climate and for the right of students to learn in a safe environment without fear. Throughout Elementary schools, students are taught about bullying more than any other grade school. 282,000 students are physically attacked in secondary schools each month. As generations have evolved, kids in all schoo ls get bullied rapidly and are afraidRead MoreBreaking News : Teen Commits Suicide1222 Words   |  5 Pages â€Å"BREAKING NEWS: TEEN COMMITS SUICIDE† is not an unusual headline to read. Time and time again teens are making the choice to end their lives much like Richard Kirchoff’s son, Ryan Kirchoff, who took his life at the young age of 18. Kirchoff’s son was a normal kid who had many friends, a loving family, and dreamt that he would become a successful doctor, but all was taken away after he made the decision to take his life. Ryan had depression and refused to seek help from the people he trusted resultingRead MoreThe Effect Of Teen Bullying Essay1618 Words   |  7 PagesEffects of Teen Bullying Bullying is defined as a superior strength or influence to intimidate someone, typically to force him or her to do what they want. Teenage bullying is a serious problem in school and it is not always physical. There are several types of bullying including physical, verbal ,emotional, covert and cyberbullying. Physical bullying can include fighting, hitting, kicking, etc. while emotional bullying can include gossiping or leaving someone else out on purpose(Bullying Info and FactsRead MoreCyber Bullying : Bullying And Bullying1290 Words   |  6 PagesModern Literature 5 May 2014 Bullying Bullying is like a disease, it stays within the schools, and community and people are trying to stop it. It destroys the victims that get bullied. Bullying has always been around and there are people trying to prevent it from happening. Bullying is being prevented by clubs and by people taking action. Bullying damages the victims and the computers can cause cyber-bullying also the victims have problems after being bullied. Cyber bullying and it keeps people hooked

The Disclosure Of Private Search Dat Aol Inc. ( An...

Many researchers are facing the challenges of producing and publishing data with the help of technologies without breaching of the privacy and confidentiality. In this report, a case study of the disclosure of private search data in AOL Inc. (an American web search media) is presented to reveal the consequences of privacy violation and highlight the importance of ethical awareness and privacy protection in research projects. Modern researchers are using technologies to collect, analyse, publish and store data electronically to improve productivity. While the deployment of the software, hardware and networks has proven to be efficient and effective, many ethical dilemmas may have encountered along with the data handling process. Lynch (2000) suggests that information is a powerful source and user accessibility is the key to its prosperity. Given the open access, duplication convenience and fast dissemination features of the online data, it is important to make ethical and legal judgments in what and how information should be collected and utilised in order to protect people’s rights and privacy. Since legal control normally fall behind technical improvements, ethics steps forward to bridge the gap and guide people in making moral decisions when handling sensitive information. Ethics refer to the rules and guidelines for differentiating between right and wrong behavior. Individuals may reach common understandings on some ethical norms but interpret them differentlyShow MoreRelatedMonsanto: Better Living Through Genetic Engineering96204 Words   |  385 Pagescommercial and social objectives C A S E N I N E From greenï ¬ eld to graduates: University of the Sunshine Coast C A S E T E N Whole Foods Market, 2005: Will there be enough organic food to satisfy the C A S E E L E V E N growing demand? Wal-Mart Stores Inc.: Dominating global retailing C A S E T W E L V E 14_Hanson_3ed_SB_3869_TXT.indd 441 8/29/07 1:09:33 PM 442 INTRODUCTION A SUMMARY OF THE CASE ANALYSIS PROCESS Case analysis is an essential part of a strategic management course

Analysis of Modern Management Thought - 1310 Words

Modern management thought can be analyzed by examining the evolution of society. Upto1700s, large organizations were mainly military, political or religious and not industrial. Gradually, members of the society began to question the existing social order which eventually gave way to new authority, structures and beliefs. During the 1800s, the technological improvements minimized the dependency on agricultural labour and created the basis for a continuous system of manufacturing which led to Industrial Revolution. Due to industrialization, Classical school of management came into existence, according to which, human beings were characterized as rational and economic being, and who would act to maximize their self-interest. Further, Scientific Approach to Management concerned with the development of one single way of performing the task and the main focus was on the measurement and structure of an organizational work. The birth of Scientific Management was attributed to Frederick Taylo r. He was in favor of the best way of doing work which resulted in optimal production. Another name attached to Scientific Management was that of Henry Gantt(1816-1919) whose main focus was on rate(amount) and to provide bonus if production exceeds. In spite of its effectiveness, Scientific Management was criticized on the ground that workers are motivated merely by money. On the other hand, worker’s motivation involves job related psychological factors which were ignored in ScientificShow MoreRelatedThe Galaxy Toys Case Study1394 Words   |  6 Pagescase study is an in-depth analysis of the management theory within the shipping department. The case study revolves around two people, Bart Aldrin and Joyce Barnhart. Bart became the manager of the shipping department in 1969 and held a 20th century management style until he was forced to change. Joyce is Bart’s replacement and is proud of her 21st century management style. This analysis will discuss the different manag ement methods that Bart and Joyce use and the management theories that they incorporatedRead MoreDecision Making Process And Companys Performance Aspect1407 Words   |  6 Pages Every modern company benefit from business intelligence. It has to be realized that almost every tool which is being used for supporting data spread across the company is simultaneously somehow connected with business intelligence solutions. Whilst business intelligence might be – as a whole – boiled down to supporting the process of transforming data into information and, then, information into knowledge usable for the company, in point of fact almost all tasks connected with data belong to BIRead MoreAnalysis Of The Experiment Management And The Worker 1485 Words   |  6 Pagesof the experiment report â€Å"management and the worker† in 1939(Gillespie, 1991) the Hawthorne studies have been playing an important role in management, psychology and sociology. Hawthorne studies were the foundation for the modern day management thinking. Hawthorne studies have been subject to many criticisms but it produced the fundamental changes in the development of management thoughts. The great contribution Hawthorne studies made to the development of modern management these experiments are identifiedRead MoreProcess Of Decision Making For A Solution Essay1576 Words   |  7 Pagesthought processes. There are many kinds of factors which can destroy promising innovation processes, and only by understanding the reasons for their existence and their nature change management can respond to them. Many kinds of factors ki ll promising change processes, and only by understanding the reasons for their existence and their nature, and innovation management can respond to them. Brainstorming and case method are the primary technique used which favours combining in the process of decisionRead MoreThe Development Of Management Theory1641 Words   |  7 PagesThe main focus behind the development of management theory is the quest for good ways to make use of managerial means. Management theory evolves constantly with the continuous stream of new ideas that come from the attempts to transform theory into practice, and vice versa (Aguinaldo Powell, 2002). Progression in management theory normal happen as key personnel discover great methods to accomplish the most important management responsibilities: planning, organiz-ing, leading, and controllingRead MoreExplain how the managerial ideas of Taylor and Fayol differ from Mayo. Assess the relevance of Classical Management theorists to the management of contemporary organisations1292 Words   |  6 PagesClassical Management comprises three different approaches: - Scientific Management (associated with the work of F W Taylor); - Bureaucratic Management (hierarchical structure associated with the work of M Weber); - Administrative Management (associated with the work of H Fayol). The Human Relations approach is associated with the work of E Mayo and F Roethlisberger. Immediately, we can see a difference between the ideas of Taylor and Fayol and those of Mayo as they are even classified differentlyRead MoreThe Development Of Management Theory1643 Words   |  7 PagesThe main focus behind the development of management theory is the quest for good ways to make use of managerial means. Management theory evolves constantly with the continuous stream of new ideas that come from the attempts to transform theory into practice, and vice versa (Aguinaldo Powell, 2002). Progression in management theory normal happen as key personnel discover great methods to accomplish the most important management responsibilities: planning, organiz-ing, leading, and controllingRead MoreApplied Research Methods in the Business Environment1786 Words   |  7 Pagesobjectives of the research are to examine how it is that management views methods of management in the organization. Towards this end, the study will examine management theory including both historical and traditional theories in management and how each of the theories is relative to specific paradigms or mindsets. Brief Critical Review of Key Academic Sources and Main Issues The work of Hartman (nd) states that the evolution of modern management thinking started first in the nineteenth century andRead MoreA Complete Risk Mitigation Strategy997 Words   |  4 Pagesoutlines your plans to mitigate risks associated with operating in the 21st century workplace. This task will be completed using the Risk Management Process this process has the following headings which will be elaborated on during the final project. Background Planning, Asset Analysis, Threat Analysis, vulnerability Analysis, Risk Identification, Risk Analysis, Risk Treatment, Monitoring Risk. Select an accrediting body to ensure IA is not only a process but a part of organizational culture goingRead MoreThe History of Management Essay1267 Words   |  6 PagesIntroduction Management in business is the coordination of people to accomplish set goals efficiently and effectively. It comprises of planning, organising, staffing, leading, and controlling an organisation. Management itself is also an academic discipline, a social science whose object of study is social organisation in order to accomplish a mutual goal. Since the dawning of civilisation, the value of the collaboration of people has been identified as a powerful method of advancement in all areas

Material Balances for Carbon Free Essays

Many of the earth’s natural processes are cyclic. The circulation of water between oceans, atmosphere and continents is a familiar example. Another is the transformation and movement of carbon-containing compounds for which the immediately obvious elements are the photosynthetic generation by plants of carbohydrates from carbon dioxide and the consumption of carbohydrates by herbivores who regenerate carbon dioxide through respiration. We will write a custom essay sample on Material Balances for Carbon or any similar topic only for you Order Now (As we shall see shortly, the complete carbon cycle involves a number of additional processes.) Such cycles are termed â€Å"biogeochemical cycles. † The term is most commonly used to refer to global cycles of the â€Å"life elements† C, O, N, S, and P, but its use is extended as well to regional cycles and to other elements or components. The study of biogeochemical cycles then is the study of the transformation and transport of substances in the Earth’s systems. In most cases the cycles link biotic (living) subsystems to abiotic (non-living) ones. Of particular current interest is the effect of human-caused disturbances on the natural cycles. A major disturbance in the carbon cycle, for example, is the continuous injection of carbon (mainly as carbon dioxide) into the atmosphere by the burning of fossil fuels. How much of this injected carbon ends up in the atmosphere? How much in the oceans? . . . in the land vegetation? What effect does the increase in carbon dioxide in the atmosphere have on the global climate? Insights to the answers to these and related questions can be gained through the use of mathematical models constructed by applying material and energy balance principles. Here the carbon cycle serves as an illustrative example, though much of the discussion is couched in terms that apply generally. The objective is to develop a simple mathematical model that will demonstrate the use of material and energy balances for studying the Earth’s natural processes. A schematic representation The transport of substances in biogeochemical systems is commonly depicted graphically by means of flowsheets or flowcharts, which are composed of boxes (or compartments, or reservoirs) connected by arrow-directed lines. As such, the depiction resembles the flowsheet for a chemical plant or process where boxes represent various 1  units (reactors, heat exchangers, etc. ) and the lines represent material flows. Indeed the analogy extends to methods of analysis, as we shall see in later sections, based on material and/or energy balances. Flowcharts for biogeochemical systems differ from those generally used for chemical processes in that a single chart for the former usually is used to track the flow of just one substance (ordinarily an element such as carbon) — but it need not be so. The number of boxes in a schematic representation is indicative of the level of detail to which an analysis will be subjected or for which information (data) is available. The least detailed for global carbon, for example, consists of only three compartments — for land, oceans and atmosphere — of the type shown in Figure 1. Commonly in such representations, the amounts, or inventory, of the substance of interest (represented by M’s in Figure 1) in each compartment have units of mass or moles. The exchange rates or flows (usually termed â€Å"fluxes† in the ecosystem literature, represented by F’s in Figure 1) have units of mass or moles per unit of time. Figure 1. Three-compartment representation of a biogeochemical cycle. M’s  represent the inventory (mass or moles), and F’s are flows or fluxes (mass or moles per unit time). atmosphere, Ma Foa Fao oceans, Mo Fta Fat land, Mt (terrestrial system) A quantitative description would give numerical values of the inventories and fluxes — or better yet, would give expressions for the F’s in terms of the M’s. Figure 2 presents a similar flowchart with a slightly higher level of detail. This representation recognizes that there may be a significant difference between concentrations near the ocean surface and those in the deeper ocean layers. We will use this representation later for studying a model of the carbon cycle. 2 atmosphere, Ma Fsa Figure 2. Four-compartment representation of a biogeochemical cycle. Fas surface ocean layer, Ms Fds Fta Fat land, Mt (terrestrial system) Fsd deep ocean layers, Md A further level of detail might add boxes to represent land and ocean biota, but we will not add that complexity for our purposes here. Mathematical models Mathematical models of biogeochemical cycles can take on various forms depending on the level of detail sought or necessary and/or on the type of supporting or verifying information or data available. In general, models attempt to relate the rates of transport, transformation and input of substances to their masses and changes by way of equations based on material and/or energy conservation principles. The description in the preceding section suggests so-called â€Å"lumped† models; that is, models in which the spatial position is not a continuous variable. Indeed it may not even appear in the model equations. It is, in fact, considered to be piecewise constant. Thus the vertical position in the ocean was separated into two parts, surface layer and deep layers. For such lumped models, the mathematical description is in the form of ordinary differential equations for the unsteady states and of algebraic or transcendental equations for the steady state. So-called â€Å"distributed† models, which consider the spatial position to be a continuous variable, lead to partial differential equations for the unsteady and ordinary differential equations for the steady state. By far the most common models employed for biogeochemical cycles are of the lumped variety, and the remainder of this module will be devoted to them. One should think of lumped models as representing overall (perhaps 3 global) averages. With sufficient detail (large number of boxes) they may be useful for accurate quantitative purposes; with little detail, they may be used to obtain rough estimates, to study qualitative trends, and to gain insights into the effects of changes. Lumped models are sometimes referred to as â€Å"black box† models — so called because they consider only the inputs and outputs of the boxes and their interior masses. They do not explore the interior details of the boxes — such as the predator-prey interactions that influence the population dynamics within the biota, or the complex ocean chemistry that affects the air-ocean exchange of material. In the same way, most flowsheet representations and calculations for chemical plants treat process units as black boxes. Material and energy balances relate known and unknown stream quantities. The detail within a box, such as the tray-to-tray compositions and temperatures of a distillation column are not directly involved in the usual flowsheet calculation, but obviously are involved in determining the output streams, or in relating them to other streams, at a finer level of detail Calculations for a model of the carbon cycle Here we will use a schematic diagram similar to that in Figure 2 to construct a mathematical model for the carbon cycle. Our purpose is to estimate the effect of fossil fuel burning on the level of carbon in the atmosphere — important information for the assessment of the greenhouse effect. Figure 2 is reconstructed below to include the input of carbon from fossil fuels. atmosphere, Ma Fsa Figure 3. A simplified representation of the carbon cycle, including an input from fossil fuel burning. Fas surface ocean layer, Ms Fds Fat land, Mt (terrestrial system) Fsd deep ocean layers, Md  4 Fta Ff fossil fuels The following equations relate the flow rates (fluxes) in the diagram to the masses of carbon in the boxes in the form employed in references [1] and [2]. The numerical values of the coefficients were derived from data presented in those references. Ffa is an input disturbance, yet to be specified. In these equations, the masses (the M’s) are in units of petagrams, and the fluxes (the F’s) are in units of petagrams per year. (One petagram is 15 10 grams. ) Fas = (0. 143) Ma (1) Fsa = (10 ( 2) ?25 )M 9. 0 s Fat = (16. 2) Ma0. 2 (3) Fta = (0. 0200 ) Mt ( 4)  Fds = (0. 00129) Md (5) Fsd = ( 0. 450) Ms ( 6) Notice that Equations 2 and 3 are nonlinear relationships between fluxes and masses. To appreciate the reason for this, say in Equation 2, bear in mind that the fluxes and masses are measures of the element C, which actually exists in various compound forms, with equilibrium likely established among them, in the ocean waters. Yet it is only carbon dioxide that enters the atmosphere from the ocean layers in any appreciable quantity. Therefore, the relationship between carbon dioxide and the total carbon in the ocean layers is complicated. The nonlinear relationship in Equation 3 is explained by the fact that this rate of transfer, nearly all in the form of carbon dioxide, is governed mainly by the rate of photosynthesis by plants — a rate usually not limited by carbon dioxide supply from the air but rather by the photochemical and biochemical reactions at play. Material balances Material balances on carbon (i. e. , atomic balances) may be written for each of the boxes in Figure 3. As an example, with the information in Equations 1-6 incorporated, the unsteady balance on the â€Å"atmosphere† box is given by 5 dMa 0. 2  = (10 ?25 ) Ms9. 0 + (0. 0200) Mt ? (0. 143) Ma ? (16. 2 ) Ma + Ff dt ( 7) Similar balances must be added for the other three compartments, and initial values for the four M’s must be given to complete the mathematical model. The input from fossil fuel consumption, the disturbance function Ff, may be a constant or a function of time. Its current value is about 5 petagrams of carbon per year. Over some periods of time its value increased at the rate of about 4% per year. Inasmuch as the Earth’s total reservoir of fossil fuels is estimated to be 10,000 petagrams, of which only half may be  recoverable for use, the current use rate, much less any significant increase, is not sustainable indefinitely. However, in the much shorter run, the concern is not about the availability of fossil fuels, but about how their use may be affecting the global climate. Steady states . The steady-state model is derived simply by setting the time derivatives in the transient equations to zero. Further, we can deduce from physical considerations that no steady state is possible unless Ff is zero. (Notice that the steadystate equations are nonlinear in the M’s owing to the exponents on Ms and Ma. Consequently, a numerical search procedure must be used to obtain solutions to Problem 1 below. ) Problem 1 Incorporating the information in Equations 1-6, write the steady-state carbon balance for each of the four â€Å"boxes† in Figure 3, taking Ff to be zero. Can you solve these equations for the numerical values of the four M’s? (Note that the equations are not linearly independent; one is redundant. ) (a) Take the total M (i. e. , the sum of the four M’s) to be 39,700 petagrams (the actual current estimate of the total carbon in the four compartments) and solve for the M’s. Note that your solution would be the ultimate steady-state distribution of carbon if the usage of fossil fuels were discontinued now — that is if Ff were immediately decreased from 5 petagrams per year to zero. (b) Instead of assuming an immediate reduction in Ff to zero, suppose that the usage of fossil fuels is reduced gradually in such manner that the carbon entering the atmosphere from this source decreases linearly with 6 time from 5 petagrams per year to zero over the next 100 years. Calculate the total amount (in petagrams) of carbon released by fossil fuel use over that 100-year period, and determine the new set of M’s at steady state. What fraction of the added carbon will ultimately (steadily) reside in the atmosphere? Unsteady (Transient) States. While information about steady states is of interest and importance, the more relevant questions can only be answered by examining the transient or unsteady state. How long does it take to approach a steady state? What levels of carbon are reached in the atmosphere along the way to an eventual steady state? What is the effect of increasing or decreasing the rate of consumption of fossil fuels? Consider the first question. According to the numerical values given above for fluxes and reservoir levels of carbon, the effective time constants for the reservoirs vary from a few years for the atmosphere to hundreds or thousands of years for the deep ocean layers. Therefore, a large input into the atmosphere may eventually decay to only a modest permanent (steady-state) increase owing to the fact that the large capacity of the oceans will eventually absorb most of it — but the effects on the atmosphere may be felt for a century or more. The point was made above that the steady-state equations, being nonlinear, cannot be solved analytically. The same is true for the unsteady state. Therefore, the following problem requires a numerical procedure for solving the system of nonlinear ordinary differential equations. Problem 2 . Equation 7 gives the material balance for carbon in the atmosphere. Complete the mathematical description of the unsteady state by writing similar balances on the remaining three compartments shown in Figure 3. Take the initial (current) levels of carbon in the four reservoirs to be 700, 3000, 1000, 35000 for the atmosphere, terrestrial, surface ocean, and deep ocean reservoirs, respectively — all in petagrams. (a) Assuming that the carbon input from fossil fuel use remains constant at its present level of 5 petagrams per year, generate a numerical solution giving the amount of carbon in each reservoir versus time over a 100-year period. (Show your results in graphical form. ) (b) As in part (b) of Problem 1, let Ff decrease linearly with time from 5 petagrams per year to zero over 100 years. Again generate solutions and present curves showing the 7 reservoir levels of carbon versus time up to 100 years. What fraction of the total carbon entering the atmosphere from fossil fuel use is present in the atmosphere at the end of the 100-year period? Compare that fraction to your answer for part (b) of Problem 1. Comments? A Glance at the Global Warming Problem You might ask why should we be concerned about changes in atmospheric carbon levels. After all, the levels are very low. Further, we should expect some natural level of CO2 in the atmosphere owing simply to that generated by the respiration of plants and animals. In fact, that natural level is estimated to be about 280 ppmv — a pre-industrial level that probably existed steadily for centuries before the industrial revolution. The answer to such questions is not simple, but the major concern nowadays is the possible upsetting of the Earth’s energy balance leading to an increase in the average global temperature. We will not attempt an exhaustive treatment of this subject here, but since it connects directly to the preceding discussion of the carbon cycle, it warrants a quick glance at least. The following equation gives the simplest form of the Earth’s energy balance. S(1 ? f ) r = 2 4 2 T (4 r ) (8) where S is the solar constant — i. e. , the amount of incident solar radiation per unit projected area of the Earth, f is the albedo or reflectivity of the Earth, r is the Earth’s radius ? is the effective emissivity of the Earth for infrared radiation to outer space, ? is the Stefan-Boltzmann constant T is the absolute temperature — indicative of the global average temperature. The radius, r, cancels from Equation 8. The following list gives values for the other quantities in Equation 8. 2 S = 1367 watts/m f = 0. 31 ? = 0. 615 -8 2 4 ? = 5.5597 x 10 watts/(m oK ) 8 Equation 8 is a steady-state balance equating the solar energy reaching the Earth’s surface (on the left side) to the energy lost by infrared radiation to outer space (on the right side). Atmospheric gases affect the reflectivity, f, and the effective emissivity, ?. In particular, so-called greenhouse gases decrease ? by absorbing, or â€Å"trapping†, some of the infrared radiation, thereby reducing the amount of energy that can escape from the Earth. If all other factors are constant, a lower value of ? will result in a higher value of T from Equation 8. Other factors come into the picture, however, and lead to uncertainty about the extent of global warming that may occur due to increases in CO2 and other greenhouse gases. For example, an increase in the average temperature would probably lead to an increase in aerosols and cloudiness, which will act to increase f and offset the effect of a decrease in ?. We probably error on the pessimistic side (i. e. , predicting a temperature change that is too large) if we assume, as we shall here, that an increasing CO2 level works only to decrease ?. The following equation gives a reasonable estimate for that variation. = 0. 642- (8.  45 x 10-5) pco 2 (9) where pCO2 is the concentration of carbon dioxide in the atmosphere in parts per million by volume (ppmv). Problem 3 For this problem you will need to calculate the concentration of CO2 in ppmv from the total mass of atmospheric carbon. For that calculation, take 18 the total mass of the atmosphere to be 5. 25 x 10 kg. In all cases use the initial values for the M’s given in Problem 2. (a) Using your result from Problem 1(b) along with Equations 8 and 9, calculate the predicted eventual increase in the global temperature attributable to the carbon added to the atmosphere over a 100-year period. (b) Repeat Problems 2(a) and 2(b), this time including a graph of the global temperature change versus years as predicted from Equations 8 and 9. Comment about the resulting temperature following from Problem 2(b) vis-a`-vis that following from Problem 1(b). 9 Problem solutions Solutions to the three problems presented in these notes are available to course instructors as Mathcad (Macintosh) files or as copies of those files in pdf format. Copies may be obtained by e-mail request to schmitz. 1@nd. edu. How to cite Material Balances for Carbon, Papers

Country vs City Life free essay sample

Where is the most ideal living? if you have two choices: living in city or in country, which one will you choose? I think the most important decision to a happy life is where you choose to spend the rest of your life and how you want to live. In the country, you can have as many pets as you want, and you can play your music as loud as you want without the neighbors complaining. The country life is quiet and peace, country living look like a nice dream: hearing natural music, seeing sights, and planting trees.. However, big city life is more appealing for the younger generation. Many young people would be bored to tears if they had to live in a country setting. The big city is full of exciting activities for the younger crowd, such as a variety of clubs, pubs, concerts, football games, and hanging out with their friends at the local mall. We will write a custom essay sample on Country vs City Life or any similar topic specifically for you Do Not WasteYour Time HIRE WRITER Only 13.90 / page A big city exudes more energy, sparkle and glamour for those who seek living in metropolis surroundings. I also think country life is more healthy. There are less pollution, fewer factories and less noise in the country. Trees are more abundant in the country, which means cleaner air to breathe. You can sleep better at night without all the noises of the city. There is far less crime in the country, making it a safer place to live. country people look younger than their ages and longer life because they enjoy relax living, fresh food and fresh air, In contrast, people in city are able to look like young by doctors, and have longer from taking care healthy systems and hospitals, Hospitals in the big cities are abreast of the times, have more new technologies and innovations, and just at five minutes from your house. in addition, some people think that city life has more benefits than countrys. City life is bustling with people, traffic, noise and pollution. Yet more people prefer to live in the city. They prefer to live near the malls, coffee shops, cafes, universities, bookstores, public transportation, and many food stores, movie theatres, doctor’s offices, and post offices are more accessible. Your neighborhood grocer is right down the street, and so is your dry cleaners, your favorite fast food place, and most of all, you have a department store, for instance your neighborhood Wal-Mart is always nearby. Talk about work may be more difficult if you live in the country. The job market in the country is smaller than the job markets that could be found in the cities. In the country people have their farm and even their own stores but in the cities people are mostly working for companies operated or even owned by a bigger company. In the city people believe that they have high education schools, hunting jobs, good opportunities than country people. In summary, there are many different reasons to choose a living place. Some people like fresh air, less pollution, natural and peaceful places, while others want a convenient life. in my mind, I always think that it is the city rather than the country.

Packet Scheduling In An Energy Harvesting â€Myassignmenthelp.Com

Question: Discuss About The Packet Scheduling In An Energy Harvesting? Answer: Introducation DES: Data Encryption Standard or DES is considered to be a symmetric key algorithm. The block cipher here is of 64 bits. It has the ability to encrypt exactly 64 bits of data at a single time. Presently it is known as AES. The DES differs from stream cipher because it does not encrypt single bit at one time. This is a symmetric cryptography (ISLAM AZAD, 2014). A cipher block called Fiestal block forms the basis of DES. The size of key in this encryption standard is 56 bits but the actual key input is of 8 byte. It is known to be the main standard or form of symmetric algorithm. Triple DES: Triple DES is a variation of the Data Encryption Standard. It is also known as EDE which means to encrypt then decrypt and again encrypt. Three DES applications are used in triple DES (Barker Barker, 2012). There are two DES keys that are independent in nature. An effective key length is generated that is 168 bits long. The three keys are of size 168, 112 and 56 bits. The 56 bits key is used for first encryption, and then the 112 bits key is used for decryption. At the end the 168 bits key is used for encryption again (Bhanot Hans, 2015). This is much more secured than the DES. RC2: RC2 is considered to be a symmetric key block cipher that is of 64 bits. The keys used vary in length. The block cipher is iterated and its computation is a function of plaintext. There are two types of rounds present in RC2 (Alam Khan, 2013). RC2 is the optimized version of the DES. The cipher here is fast. The decryption and encryption operations are not equal. The keys are public. And it is a symmetric algorithm unlike the symmetric block cipher of DES and triple DES. It is vulnerable to security threats. There are sixteen mixing round and two mashing rounds. Security Challenges of two examples of WPAN technologies The example of WPAN technologies considered here is Bluetooth and ZigBee. Security Issues in Bluetooth: The Bluetooth network is vulnerable to several security risks and threats. A process by which hacker attacks or hacks a Bluetooth network is known as Bluesnarfing. This type of hacking accesses the detailed information present in the cell phones and wireless devices like photographs, contacts and other sensitive data (Minar Tarique, 2012). This occurs in a silent manner and the user is unable to understand. There are threats of another hacking technique called backdoor hacking. Here a non trusted device can still access the information present in another mobile device. Bluejacking is a major threat in the Bluetooth technology and networks (Padgette, 2017). Here the attacker renames their own device and during the process of pairing with another device it influences the victims device to pair it with them. Suppose the name of the attacker device is Click accept for winning $500. Then in this case the victim can click access. This allows the hacker to get access to the victims device. There are also other risks like virus and worms attack. Malware can harm the mobile device. Security Issues in ZigBee: ZigBee is considered to be a standard that is used for wireless networking. There are various kinds of attacks associated with ZigBee. Consider a device containing ZigBee radio in it and if an attacker who has huge knowledge about it is able to access the device physically then it is known as the physical attack. Here the attacker targets the encryption key of the device (Zillner Strobl, 2015). Another category of threat is called key attacks. Here the attacker tries to gain access to a device from a remote location. It also tries to obtain the encryption key. This attack can take place by imitating a node on the network of ZigBee (Wang, Jiang Zhang, 2014). There is another type of attack or threat where the attack is on the key but it also uses the packet replay attack or injection attacks. It attempts to trick the device in order to perform an unauthorized activity or action. These types of security issues are present because of the protocols that are l ight weight in design. Critical Reflection on Energy Harvest Harvesting of energy can be done from the natural resources like thermal energy, solar energy as well as kinetic energy. After deriving the energy it is stored for the purpose of small and wireless devices like the sensor networks that are wireless. This energy harvesting concept helps to conserve energy and it utilizes or consumes small range of power for those electronics that need low energy. If the wireless devices are incorporated with the capability to harvest energy then it will enable every node in the wireless networks to acquire energy in a continuous manner. This energy harvesting concept will be responsible for a great future of wireless networks. A wireless network that will harvest energy will introduce numerous changes in the concept and operation of wireless networking (Ulukus et al., 2015). There are several benefits that are expected because of the energy harvesting concept. The consumption of conventional energy will become less. Wireless networks will be able to get deployed in remote locations like the rural and village areas. The energy harvesting technologies are solar and indoor lighting along with electromagnetic and thermal energies. Energy harvesting can be done from human made sources where the energy transfer takes place among various nodes over wireless medium. This can be done in a controlled procedure. Every technology involved has a different level of capability along with different level of efficiency. The concept of engineering has been used in order to improve the mechanism of energy harvesting in a continuous manner. It also improves the process of communication in a wireless network. New dimensions are added to the problems of wireless communications. There is intermittency as well as randomness in the availability of energy. There is also intermittency as well as randomness in the energy sharing possibility that can take place in the nodes present in the wireless network. All these present a new dimension to the protocols that are applied in the several layers like medium access, physical as well as networking layer. The information theoretic concept of harvesting energy uses AWGN channel and the concept of Guassian noise. The output of this concept is the addition of input X and noise N. The problems of communication using energy harvesting can be solved by certain communication theories as well as networking app roaches. The single channel optimization faces a constraint called energy casualty. The solution provided here aims at keeping the power periods at the longest stretch in a continuous manner. In case of multiple access channel, directional as well as generalized water-filling along with iterative water-filling techniques are used in a combined manner in order to get a management scheme that is optimum. Devices that have the capability to harvest energy can send packets of data based on the policy of transmission (Yang Ulukus, 2012). There are issues relating to code designs as well. There are certain challenges in harvesting energy in wireless networks. There are chances of improvements in the process of transferring energy. There are challenges regarding the understanding of the interdisciplinary nature associated with wireless networks and energy harvesting concept. It mainly focuses on the integration of devices and circuits that harvest as well as transfer energy. Wireless Sensor Networks are gaining importance with time. The major drawback of this technology is that only limited amount of energy is associated with it. This limitation is trying to be resolved by designing and developing high performance and energy efficient systems that are used for the purpose of energy harvesting. There are two main sources of energy called the external and ambient sources (Shaikh Zeadally, 2016). Ambient sources are available in the nature very easily and with least cost. Explicit sources are explicitly deployed for the purpose harvesting energy. In the method of radio frequency harvesting, radio waves get transformed into DC power (Lu et al., 2015). In the process of thermal harvesting technique, the heat energy is transformed into electric energy. Other forms of ambient sources include solar, wind and hydro energy. The use of solar energy would be very effective in case of solving the WSN issues and problems. The moving water generates energy and it is a n effective method of harvesting energy. Wind energy is also very important for the purpose of resolving the issues in WSN. External sources of energy consider certain methods like mechanical harvesting and human based harvesting. The mechanical harvesting technique uses the electrostatic, piezoelectric as well as the electromagnetic mechanisms for harvesting energy. The variations in the pressure are converted into energy. To monitor the physiological nature of a human certain sensor nodes are put inside or on the body of the human. These harvest energy from the locomotive movement of the humans. Energy harvesting models can be designed by taking into consideration two main factors like rate and amount of energy harvested. The characteristics of the models will differ based on the sources of energy. There are certain challenges like energy generation from several sources, prediction as well as designing reliable systems that are energy efficient. The storage of energy is also another challenge. Energy harvesting is extreme ly important for the future development and deployment of WSN. Every energy source is associated with a different capability. Based on the capabilities, the harvesting models are designed. There are still many challenges that are not identified. References Alam, M. I., Khan, M. R. (2013). Performance and efficiency analysis of different block cipher algorithms of symmetric key cryptography.International Journal of Advanced Research in Computer Science and Software Engineering,3(10). Barker, W. C., Barker, E. B. (2012). SP 800-67 Rev. 1. Recommendation for the Triple Data Encryption Algorithm (TDEA) Block Cipher. Bhanot, R., Hans, R. (2015). A review and comparative analysis of various encryption algorithms.International Journal of Security and Its Applications,9(4), 289-306. ISLAM, E., AZAD, S. (2014). data encryption standard.Practical Cryptography: Algorithms and Implementations Using C++, 57. Lu, X., Wang, P., Niyato, D., Kim, D. I., Han, Z. (2015). Wireless networks with RF energy harvesting: A contemporary survey.IEEE Communications Surveys Tutorials,17(2), 757-789. Minar, N. B. N. I., Tarique, M. (2012). Bluetooth security threats and solutions: a survey.International Journal of Distributed and Parallel Systems,3(1), 127. Padgette, J. (2017). Guide to bluetooth security.NIST Special Publication,800, 121. Shaikh, F. K., Zeadally, S. (2016). Energy harvesting in wireless sensor networks: A comprehensive review.Renewable and Sustainable Energy Reviews,55, 1041-1054. Ulukus, S., Yener, A., Erkip, E., Simeone, O., Zorzi, M., Grover, P., Huang, K. (2015). Energy harvesting wireless communications: A review of recent advances.IEEE Journal on Selected Areas in Communications,33(3), 360-381. Wang, C., Jiang, T., Zhang, Q. (Eds.). (2014).ZigBee network protocols and applications. CRC Press. Yang, J., Ulukus, S. (2012). Optimal packet scheduling in an energy harvesting communication system.IEEE Transactions on Communications,60(1), 220-230. Zillner, T., Strobl, S. (2015). ZigBee exploited: The good the bad and the ugly.