QUANTITATIVE METHODS IN BUSINESS & MANAGEMENT Coursework - 1

QUANTITATIVE METHODS IN BUSINESS & MANAGEMENT - Coursework Example Wales had a small representation in the study with only 5 percent. The pie chart below further illustrates the representation by state. The age of the respondents is shown in the table above. The age ranges from 18 years to 97 years. There were those who also did not know their age were grouped as DK/Ref/NA/. The highest number of respondents was of the age 65-97 years. The age between 18-24 had 12.1 percent representation. The pie charts before shows the age representation of the respondents. The above table shows the marital status where most of the respondents are married or living as married with 62.3 percent. There were also another 21.2 percent of those who said they never been married. Widowed were 6.8 percent while those who were separated or divorced had 9.7 percent. The table above shows the views of the respondents on issues of Censorship of films and magazines is necessary to uphold moral standards. 17.8 percent and 43.2 percent of that respondents said they agree and strongly agree respectively. There were only 12.6 percent of the respondents who disagreed while 3.7 who strongly disagreed. There were 21.4 percent remained neutral while 1.3 percent did not answer. This question was about readership of the newspaper in UK, from the statically data above, most of the people in UK stay with paper with those with no paper being 60.4 percent. Tabloid has a readership of 25.9 percent; broadsheet had 13.1 percent while those who read other paper had 0.5 percent. This means that most of the people do not read newspapers. However, among those who read it go for tabloid compared to broadsheet. The above question wanted to know the opinion of people of UK what the government should do between spending and tax. Most of the people wanted the government to keep spending and taxes to be at the same level with 54.5 percent which is more than half of the respondents. There another group of people who felt that taxes and spending

Stereotype Essay Example | Topics and Well Written Essays - 500 words

Stereotype - Essay Example Women on the other hand can now be seen to be getting involved with the kind of work that gender wise, was left for man. The main concepts that have been presented in the articles are stereotypes that are experienced among the Stay At Home Dad. From the story, it can be learnt that SAHD faces several stereotypical arguments such as being unmanly enough. According to the Glen Sack, it is believed that men should always be out there fending for the family and should not be preoccupied with the household duties. Sometimes they are also accused of living at the mercies of their stronger wives who have to go out there and fend for the family. In the case of the Hispanic women, the authors Jeffery Shelter and Michael have identified the connotations like, Hispanic women being hot female or sexual firebrands. These stereotypes are fueled by the media, which just pick the generalization and relay it without establishing facts around it. Jeffery and Michael also suggest that this stereotype is something that is transferred from the parents specifically the mothers who at the tender age of their children begin to teach children about the images and what to regard as a good image and what is bad. They also do this through color separation, where male children are associated with the blue colors while female children are The change in the gender roles has been one of the achievements that have been made in the society to ensure that gender equality and equity are observed. This however also comes with its own challenges. First and foremost, when gender roles change, new responsibilities are realized. With increase in rights, comes responsibility. What has been elaborated carefully in the articles particularly by Glen Sack on SAHD. Men now got to adjust to new role of taking care of the children in the house. He now must admit that women must also now contribute in the house just like the man would do in order to sustain

My Immigration Research Paper Essay Example for Free

My Immigration Research Paper Essay In this paper I will use the ethical theories of utilitarianism and deontology, as well as the perspective of ethical egoism, as they pertain to the issue of immigration. Living in a state bordering Mexico [New Mexico], this is indeed becoming a pressing issue as tens of thousands of illegal immigrants flood my state and neighboring states. This issue brings up many questions such as: 1 – What is our moral obligation to these immigrants? 2- What is our moral obligation to U. S. citizens that are affected by this influx? 3- Is it morally right for smugglers to profit from the pain of those seeking safety, security, and a better life? 4- Is it morally/ethically right for parents to subject their children to the long, lonely, dangerous journey to the United States. By applying the theories and perspective noted above, I will show that if this issue is not handled immediately, the consequences will be detrimental to both U.S. citizens and the immigrants as well. The desire of the immigrants to obtain a better life does not preclude them from following current laws and processes. While they act from a position of self -interest, their actions impact many others in the process. From October 2012 through September 2013, the Border Patrol has apprehended about 24,000 unaccompanied children at the border. Between October 2013 and the end of June 2014, the number rose to 57,000. It is estimated this number could reach 90,000 by the end of September 2014. Most are coming from El Salvador, Honduras, and Guatemala. Once the immigrants arrive in the United States, what is our moral obligation to them? Under current law, these children are placed under the custody of the Department of Health and Human Services which works to place them with family members in the U.S. while awaiting a court date. The influx has created the largest backlog in immigration courts. â€Å"In the first half of the year there were 366,724 pending cases. As of March the average wait time for  a case was 578 days, according to the Justice Department records.† Experience has shown many immigrants never show up to these hearings.† Deontology claims an act is to be evaluated in terms of its accordance with a set of rules. Consequently, it is clear that these immigrants have broken the immigration laws of the U.S. both in the way they entered the country and in their refusal to attend court hearings. Their flight to this country clearly is done for the person’s self- interest. They hope to flee the dangers and poverty of their home countries to seek a better life in the United States. However, does the actions of the immigrant outweigh the effect of this influx on the population of the United States? Once here, national, state, local and charitable organizations are being used to house, feed, provide medical care, and other assistance to these immigrants. Meanwhile, United States veterans, homeless, mentally ill, and the elderly go without needed services. Should our own citizens not be our main focus? In my state of New Mexico, one of the poorest in the nation, we are currently housing and processing hundreds, if not thousands of these immigrants. My town of Las Cruces has opened its churches to house and care for the immigrants, even though many of the children here do not have enough to eat or a proper living environment themselves. Once the immigrants arrive at our local shelter, they are given a cot, clean clothes, a shower, hot meals and health checks. After eating, they file into rooms to collect hygiene supplies, diapers, clothes, and suitcases. Children can choose one toy from a large box of donated stuffed animals. Down the hall, volunteers assist the immigrants to call their families across the country and book train, bus, and plane tickets, depending on how much the families can spare. With the system the church shelter has developed, most immigrants will be on their way to relatives within 2 days. President Obama is seeking billions of dollars to increase the number of facilities for these immigrants, to tighten border security, and expand the number of U.S. immigration judges. Should huge amounts of U.S. money be expended to deal with illegal activity or more properly used to alleviate problems of legal U.S. citizens? Governor Rick Perry of Texas has ordered the National Guard to help protect the border because of Congress’s inability to act on this issue. Again, this is taking resources that might be needed elsewhere. While most Americans understand and empathize with the reasons for this influx,  the cost to the American public is substantial. One of the less publicized sides of this immigration issue is the smuggler’s profiting from the distress/fear of others. The smugglers are referred to as ‘coyote’ smugglers. One smuggler described â€Å"shipments of thousands of dollars in human cargo from slums of Honduras and highlands of Guatemala to cities across the United States. It is business; sometimes business is very good.† The vast majority of immigrants who enter the U.S. illegally do so with the help of a network of smugglers. It is a high risk, high yield business estimated to generate $6.6 billion a year. The immigrants pay $4,000 to $10,000 each for this illegal journey. The smugglers in turn pay off government officials, gangs operating on trains, and drug cartels. The experts estimate a profit of $3,500- $4,000 per person if the journey goes as planned. The smugglers are profiting from the rising violence in gang-ridden cities of Central America. Many of the immigrants travel to the U.S. because they believe they will be allowed to stay. The U.S. generally releases children to parents, relatives, or family friends. Their cases take years to go through the immigration courts. This gives rise to rumors of a new law or amnesty for children. The coyote smugglers spread those rumors to drum up business. In a July 23, 2014 issue of the Las Cruces Sun-News it was reported that the Homeland Security Department arrested 192 people along the Mexico border in South Texas on immigration smuggling charges and seized more than $625,000. A crackdown called â€Å"Operation Coyote† took place over the last month, part of the 90 day effort to target smuggling groups. The White House stated that smugglers are exploiting U.S. policies and the crackdown was a message to the smugglers that â€Å"our borders are not open to illegal immigration.† Analyzing this issue from the perspective of ethical egoism, the immigrants and the smugglers are both looking out for themselves, one to seek freedom and a better life, the other to procure as much money as possible. From a deontology perspective, clearly both the immigrants and smugglers are not following the law. The immigrants are entering the U.S. illegally while the smugglers are giving payoffs to drug cartels, gangs, and government leaders. Finally from a utilitarian standpoint the course of action of both the illegal immigrants and the smugglers certainly does not maximize the greatest good for the greatest amount of people. The illegal immigrants may benefit in the short run, but  if eventually returned to their countries may indeed be subject to even greater hardship. The corruption supported/used by the smugglers does nothing to create a better life for the majority of people. And once again the financial and emotional effect on the U.S. is wide spread. Another question/ concern raised by this influx of mostly unaccompanied children is related to their safety, both in their home countries and related to their long journey to the United States. Homicide, extortion, rape, and gang recruitment have risen to epidemic levels in Guatemala, Honduras, and El Salvador. â€Å"Immigrants’ rights advocates in the U.S. say they are seeing more children from Central America who are not only fleeing gang recruitment and random violence, but who have been targeted themselves.† This violence is seen as the key reason for driving immigrants north. But let’s look at the very imminent danger of death these immigrants face by not only placing themselves in the hands of smugglers [whose only concern is money] and the desert journey they face. The smugglers receive money from the immigrants and their families [both in their home country and in the U.S.] This in turn places more of a financial burden on these families, while a successful outcome is not assured. Along the journey, these immigrants are still subjected to the threats of gangs, drug cartels, and corrupt government officials. They are subjected to the extreme heat of the desert with little food or water and often just the clothes on their backs. Recent news reports put a face to this crisis when Texas authorities identified a decomposed body found recently near the border with Mexico as that of an 11 year old Guatemalan boy, Gilberto Francisco Ramos Juarez. He was identified by calling a phone number etched into his belt buckle and by family members describing the clothes he was wearing when he left home. A recent interview of a rancher in Brownsville Texas reported him also finding a body on his ranch. He reports having to keep a constant vigil all day and night as illegal immigrants enter his land, approach his house and car, and seek aid. Hector Espinal, the Honduras spokesman for UNICEF, stated â€Å"The message is that governments should do what they need to do to stop the violent conditions that are making these children leave.† How to stop violence in Honduras is a subject of much debate. Two major gangs- The Mara Salvatrucha and Barrio 18, have grown into transnational criminal organizations. Drug cartels use Honduras as a point to move cocaine into the United States.  First Lady Garcia of Honduras says her country needs its own U.S. funded anticrime program similar to Plan Colombia or Mexico’s Merida Initiative to fight the gangs and cartels. Vice President Joe Biden recently visited Guatemala. To coincide with that trip, President Obama has pledged $93 million in new programs to reduce violence in Central America. This includes $40 million to reduce gang membership in Guatemala, $25 million to build 77 youth outreach centers in El Salvador and $18.5 million to build 77 outreach centers in Honduras. The White House is currently requesting approximately $3.7 billion in emergency funding with $300 million for international programs to aid Central America. However, the House Republicans recently passed legislation to address the crisis. The new $694 million version would send migrant youths back home without hearings, and contained a companion bill that could lead to deporting more than a half a million immigrants to whom the Obama administration granted temporary work permits. This companion bill could prevent more than 700,000 people who’ve already gotten work permits, from renewing them. Lawmakers objected to sending any more money to President Obama without a strong stance against the two-year-old deportation relief program that they blame for causing the current border crisis by creating the perception that once here, young migrants would be allowed to stay. The new GOP border bill adds $35 million more for the National Guard, reimbursing states for guard deployment. It would increase spending for overwhelmed border agencies, add more immigration judges and detention centers, and alter a 2008 anti-trafficking law. We can apply the theories of utilitarianism and deontology and the perspective of ethical egoism to the above question much in the same way as we did before. Once again the immigrants, but also the smugglers, are acting in their own self-interest. One wants freedom, the other seeks money. Both the illegal immigrants and the smugglers are breaking the law, both in their home countries as well as the United States. By focusing on their own interests, the illegal immigrants forget the bigger picture. Would it not benefit the greater number of people to focus on the root problems in Central America? No one doubts the dangerous conditions in these countries. However, other dangerous conditions face the immigrants on the journey to the United States. Is one danger greater than the other? If these immigrants indeed make it to the United States, most will be returned to their home countries  to be placed in the same conditions, disillusioned from the loss of their hopes and dreams. Only by a concerted effort to improve conditions in their home countries, can the greatest benefit result for the greatest number of people. The issue of immigration is perhaps one of the hottest issues facing our country today. As tens of thousands of illegal immigrants make their way into the U nited States, many moral and ethical issues arise. Do the individual rights of the immigrant to seek a better life, outweigh the negative effect their actions place on their own families as well as the citizens of the United States? Do the immigrants have a right to break laws, both in their home countries, as well as the United States, in order to obtain their dream? Is it the ethical/moral responsibility of the United States to care for the illegal immigrants once they arrive? And lastly, is it morally /ethically correct to send children from one dangerous situation into another one, rather than trying to fix the core issues precipitating their illegal journey to the United States? By applying the theories of utilitarianism and deontology, as well as the perspective of ethical egoism, I have attempted to answer these questions. Utilitarianism stresses the greatest good for the greatest amount of people. In the case of illegal immigration that would seem to be that more effort should be aimed at correcting the core issues in Central America. Deontology stresses evaluating an issue in terms of its accordance with a specified set of rules. Obviously, in the case of illegal immigration, the laws are not being followed. And lastly, ethical egoism argues that acts should be done out of a person’s own self –interest. Clearly, this is what drives the immigrants. But the impact in the long run, both to the immigrants, their families, and the citizens of the United States, may be too big a price to pay. References 1 Exporting Mayhem across the Border. [2014]. Bloomberg Businessweek, [4379], 10. [Permalink]:http://search.ebscohost.com.prox-library.ashford.edu/login.aspx?direct=truedb=bshAN=96077008site=eds-live 2 Grillo, Ioan [2014]. Honduran Children Deported From U.S. Back to World’s ‘Most Violent City. Time.Com, p1-1. 1p. [Permalink]:http://search.ebscohost.com.proxy-library.ashford.edu/login.aspx?direct=truedb=bshAN=97074587site=eds.-live. 3 LaFranchi, H. [2014July]. Border crisis: Kerry asks Central America to help combat ‘false information’. Christian Science Monitor. P.1. [Permalink]: http:// search.ebscohost.com.proxy-library.ashford.edu/login.aspx?direct=truedb=crhAN=96897036site=eds-live 4 Preston, Julia. The New York Times. U.S. looks to tide illegal border crossings-Biden goes to Central America to discourage illegal immigration- deportations of central americans will be accelerated. Accelerated by the Lexington- Herald [Ky.] [June 2014]. [Permalink]: http:// search.ebscohost.com.proxy-library.ashford.edu/login.aspx?direct=truedb=edsnbkAn=14E97D7C018E48F0site=eds-live 5 Schearer, M. [2014]. Obama in Political Bind over Unaccompanied Immigrant Minors. Time. Com, 1.[Permalink]: http:// search.ebscohost.com.proxy-library.ashford.edu/login.aspx?direct=truedb=bshAN=97059415site=eds-li ve 6 Micheal,Shear, W.[2014 July 10]. Obama seeks $4 b for border crisis- United States- Immigration- 150,000 children projected to flee Central America. The Sydney Morning Herald [Australia]. P 17. [Permalink]: http:// search.ebscohost.com.proxy-library.ashford.edu/login.aspx?direct=truedb=edsnbAN=14EF984EBA4C6788site=eds-live 7 E. Edurado Castillo and Christopher Sherman of the Associated Press. Migration spotlights Mexican ‘coyote’ smugglers retrieved from The Las Cruces Sun – News [2014 July 22]. 8 Christopher Sherman and Will Weissert of the Associated Press. Gov. Rick Perry will send National Guard to border. Retrieved from The Las Cruces Sun –News [2014 July 22]. 9 Kuhnman, Jim The Associated Press. How a flood of kids upended immigration debate. Retrieved from The Las Cruces Sun –News [2014 July 21]. 10 Anderson, Lindsey The Las Cruces Sun News. Cots, Clothes and Compassion [2014 July21]. 11 The Associated Press. Gov’t arrests 192 for smu ggling. Retrieved from The Las Cruces Sun –News [2014 July 23]. 12 Werner, Erica The Associated Press. Hose Oks border crisis bill. Retrieved from The Las Cruces Sun-News [2014 August 2].

Importance of chemical reactor

Importance of chemical reactor INTRODUCTION The most important unit operation in a chemical process is generally a chemical reactor. Chemical reactions are either exothermic (release energy) or endothermic (require energy input) and therefore require that energy either be removed or added to the reactor for a constant temperature to be maintained. Exothermic reactions are the most interesting systems to study because of potential safety problems (rapid increases in temperature, sometimes called ignition behavior) and the possibility of exotic behavior such as multiple steady-states (for the same value of the input variable there may be several possible values of the output variable). In this module we consider a perfectly mixed, continuously stirred tank reactor (CSTR), shown in Figure 1. The case of a single, first-order exothermic irreversible reaction, A > B. We will show that very interesting behavior that can arise in such a simple system. In Figure 1 we see that a fluid stream is continuously fed to the reactor and another fluid stream is continuously removed from the reactor. Since the reactor is perfectly mixed, the exit stream has the same concentration and temperature as the reactor fluid. Notice that a jacket surrounding the reactor also has feed and exit streams. The jacket is assumed to be perfectly mixed and at a lower temperature than the reactor. Energy then passes through the reactor walls into the jacket, removed the heat generated by reaction. There are many examples of reactors in industry similar to this one. Examples include various types of polymerization reactors, which produce polymers that are used in plastic products such as polystyrene coolers or plastic bottles. The industrial reactors typically have more complicated kinetics than we study in this module, but the characteristic behavior is similar. The Modeling Equations For simplicity we assume that the cooling jacket temperature can be directly manipulated, so that an energy balance around the jacket is not required. We also make the following assumptions Perfect mixing (product stream values are the same as the bulk reactor fluid) Constant volume Constant parameter values The constant volume and parameter value assumptions can easily be relaxed by the reader, for further study. Parameters and Variables A Area for heat exchange CA Concentration of A in reactor CAf Concentration of A in feed stream cp Heat capacity (energy/mass*temperature) F Volumetric flowrate (volume/time) k0 Pre-exponential factor (time-1) R Ideal gas constant (energy/mol*temperature) r Rate of reaction per unit volume (mol/volume*time) t Time T Reactor temperature Tf Feed temperature Tj Jacket temperature Tref Reference temperature U Overall heat transfer coefficient (energy/(time*area*temperature)) V Reactor volume DE Activation energy (energy/mol) (-DH) Heat of reaction (energy/mol) r Density (mass/volume) The parameters and variables that will appear in the modeling equations are listed Overall material balance The rate of accumulation of material in the reactor is equal to the rate of material in by flow-the material out by flow. Balance on Component A The balance on component A is where r is the rate of reaction per unit volume. Energy Balance The energy balance is where Tref represents an arbitrary reference temperature for enthalpy. State Variable form of Dynamic Equations We can write (1) and (2) in the following state variable form (since dV/dt = 0) where we have assumed that the volume is constant. The reaction rate per unit volume (Arrhenius expression) is where we have assumed that the reaction is first-order. Steady-State Solution The steady-state solution is obtained when dCA/dt = 0 and dT/dt = 0, that is To solve these two equations, all parameters and variables except for two (CA and T) must be specified. Given numerical values for all of the parameters and variables we can use Newtons method (chapter 3) to solve for the steady-state values of CA and T. For convenience, we use an à «sà ­ subscript to denote a steady-state value (so we solve for CAs and Ts). Dynamic Behavior We noted in the previous section that were three different steady-state solutions to the case 2 parameter set. Here we wish to study the dynamic behavior under this same parameter set. Recall that numerical integration techniques were presented in chapter 4. The m-file to integrate the modeling equations iscstr_dyn.m, shown in Appendix 2. The command to integrate the equations is [t,x] = ode45(cstr_dyn,t0,tf,x0); wheret0is the initial time (usually 0),tfis the final time,x0is the initial condition vector.tis the time vector andxis the state variable solution vector. Before performing the integration it is necessary to define the global parameter vectorCSTR_PAR. To plot only concentration or temperature as a function of time, useplot(t,x(:,1))andplot(t,x(:,2)), respectively. Initial condition 1 Here we use initial conditions that are close to the low temperature steady-state. The initial condition vector is [ conc , temp] = [9,300]. The curves plotted in Figure 2 show that the state variables converge to the low temperature steady-state. Initial condition 2 Here we use initial conditions that are close to the intermediate temperature steady-state. The initial condition vector for the solid curve in Figure 3 is [conc, temp] = [5,350], which converges to the high temperature steady-state. The initial condition vector for the dotted curve in Figure 3 is [conc, temp] = [5,325], which converges to the low temperature steady-state. If we perform many simulations with initial conditions close to the intermediate temperature steady-state, we find that the temperature always converges to either the low temperature or high temperature steady-states, but not the intermediate temperature steady-state. This indicates to us that the intermediate temperature steady-state isunstable. This will be shown clearly by the stability analysis in section 5. Initial condition 3 Here we use initial conditions that are close to the high temperature steady-state. The initial condition vector is [conc, temp] = [1,400]. The curves plotted in Figure 4 show that the state variables converge to the high temperature steady-state. In this section we have performed several simulations and presented several plots. In section 6 we will show how these solutions can be compared on the same à ¬phase planeà ® plot. Linearization of Dynamic Equations The stability of the nonlinear equations can be determined by finding the following state-space form and determining the eigenvalues of theA(state-space) matrix. The nonlinear dynamic state equations (1a) and (2a) are let the state, and input variables be defined in deviation variable form Stability Analysis Performing the linearization, we obtain the following elements forA where we define the following parameters for more compact representation From the analysis presented above, the state-space A matrix is The stability characteristics are determined by the eigenvalues ofA, which are obtained by solving det (lI-A) = 0. det (lI-A)=(l-A11)(l-A22)-A12A21 =l2-(A11+A22)l+A11A22-A12A21 =l2-(trA)l+det (A) the Eigen values are the solution to the second-order polynomial l2-(trA)l+det (A) =0(13) The stability of a particular operating point is determined by finding theAmatrix for that particular operating point, and finding the Eigen values of the A matrix. Here we show the Eigen values for each of the three case 2 steady-state operating points. Input / Output Transfer Function Analysis The input-output transfer functions can be found from G(s)=C(sI-A)-1B(14) where the elements of theBmatrix corresponding to the first input (u1 = Tj-Tjs) are the reader should find the elements of the B matrix that correspond to the second and third input variables (see exercise 8) Here we show only the transfer functions for the low temperature steady-state for case 2. The input/output transfer function relating jacket temperature to reactor concentration (state 1) is and the input/output transfer function relating jacket temperature to reactor temperature (state 2) is Notice that the transfer function for concentration is a pure second-order system (no numerator polynomial) while the transfer function for temperature has a first-order numerator and second-order denominator. This indicates that there is a greater à ¬lagà ® between jacket temperature and concentration than between jacket temperature and reactor temperature. This makes physical sense, because a change in jacket temperature must first affect the reactor temperature before affecting the reactor concentration. Phase-plane Analysis In section 4 we provided the results of a few dynamic simulations, noting that different initial conditions caused the system to converge to different steady-state operating points. In this section we construct a phase-plane plot by performing simulations for a large number of initial conditions. The phase-plane plot shown in Figure 6 was generated usingcstr_run.mandcstr.mfrom the appendix. Three steady-state values are clearly shown; 2 are stable (the high and low temperature steady-states, shown as à «oà ­), while one is unstable (the intermediate temperature steady-state, shown as à «+à ­). Notice that initial conditions of low concentration (0.5 kgmol/m3) and relatively low-to-intermediate temperatures (300 to 365 K) all converge to the low temperature steady-state. When the initial temperature is increased above 365 K, convergence to the high temperature steady-state is achieved. Now, consider initial conditions with a high concentration (9.5 kgmol/m3) and low temperature (300 to 325 K); these converge to the low temperature steady-state. Once the initial temperature is increased to above 325 K, convergence to the high temperature steady-state is achieved. Also notice that, once the initial temperature is increased to around 340 K, a very high overshoot to above 425 K occurs, before the system settles down to the high temperature steady-state. Although not shown on this phase-plane plot, higher initial temperatures can have overshoot to over 500 K before settling to the high temperature steady-state. This could cause potential safety problems if, for example, secondary decomposition reactions occur at high temperatures. The phase plane analysis then, is able to à ¬point-outà ® problem initial conditions. Also notice that no initial conditions have converged to the intermediate temperature steady-state, since it is unstable. The reader should perform an eigenvalue/eigenvector analysis for theAmatrix at each steady-state (low, intermediate and high temperature) (see exercise 3). You will find that the low, intermediate and high temperature steady-states have stable node, saddle point (unstable) and stable focus behavior (see chapter 13), respectively. It should be noted that feedback control can be used to operate at the unstable intermediate temperature steady-state. The feedback controller would measure the reactor temperature and manipulate the cooling jacket temperature (or flowrate) to maintain the intermediate temperature steady-state. Also, a feedback controller could be used to make certain that the large overshoot to high temperatures does not occur from certain initial conditions. Understanding Multiple Steady-state Behavior In previous sections we found that there were three steady-state solutions for case 2 parameters. The objective of this section is to determine how multiple steady-states might arise. Also, we show how to generate steady-state input-output curves that show, for example, how the steady-state reactor temperature varies as a function of the steady-state jacket temperature. Heat generation and heat removal curves In section 3 we used numerical methods to solve for the steady-states, by solving 2 equations with 2 unknowns. In this section we show that it is easy to reduce the 2 equations in 2 unknowns to a single equation with one unknown. This will give us physical insight about the possible occurance of multiple steady-states. Solving for Concentration of A as a function of Temperature The steady-state concentration solution (dCA/dt) = 0) for concentration is We can rearrange this equation to find the steady-state concentration for any given steady-state reactor temperature, Ts Solving for Temperature The steady-state temperature solution (dT/dt = 0) is The terms in (17) are related to the energy removed and generated. If we multiply (17) by VrCp we find that Qrem=Qgen Energy Removed by flow and heat exchange Heat Generated by reaction Note the form of Qrem Notice that this is an equation for a line, where the independent variable is reactor temperature (Ts). The slope of the line is and the intercept is. Changes in jacket or feed temperature shift the intercept, but not the slope. Changes in UA or F effect both the slope and intercept. Now, consider the Q gen term Substituting (16) into (20), we find that Equation (21) has a characteristic S shape for Q gen as a function of reactor temperature. From equation (18) we see that a steady-state solution exists when there is an intersection of the Q rem and Q gen curves. Effect of Design Parameters In Figure 6 we show different possible intersections of the heat removal and heat generation curves. If the slope of the heat removal curve is greater than the maximum slope of the heat generation curve, there is only one possible intersection (see Figure 6a). As the jacket or feed temperature is changed, the heat removal lines shifts to the left or right, so the intersection can be at a high or low temperature depending on the value of jacket or feed temperature. Notice that as long as the slope of the heat removal curve is less than the maximum slope of the heat generation curve, there will always be the possibility of three intersections (see Figure 6b) with proper adjustment of the jacket or feed temperature (intercept). If the jacket or feed temperature is changed, the removal line shifts to the right or left, where only one intersection occurs (either low or high temperature). This case is analyzed in more detail in section 7.3. Multiple Steady-State Behavior In Figure 7 we superimpose several possible linear heat removal curves with the S-shaped heat generation curve. Curve A intersects the heat generation curve at a low temperature; curve B intersects at a low temperature and is tangent at a high temperature; curve C intersects at low, intermediate and high temperatures; curve D is tangent to a low temperature and intersects at a high temperature; curve E has only a high temperature intersection. Curves A, B, C, D and E are all based on the same system parameters, except that the jacket temperature increases as we move from curve A to E (from equation (7) we see that changing the jacket temperature changes the intercept but not the slope of the heat removal curve). We can use Figure 7 to construct the steady-state input-ouput diagram shown in Figure 8, where jacket temperature is the input and reactor temperature is the output. Note that Figure 8 exhibits hysteresis behavior, which was first discussed in chapter 15. The term hysteresis is used to indicate that the behavior is different depending on the direction that the inputs are moved. For example, if we start at a low jacket temperature the reactor operates at a low temperature (point 1). As the jacket temperature is increased, the reactor temperature increases (points 2 and 3) until the low temperature limit point(point 4) is reached. If the jacket temperature is slightly increased further, the reactor temperature jumps (ignites) to a high temperature (point 8); further jacket temperature increases result in slight reactor temperature increases. Contrast the input-output behavior discussed in the previous paragraph (starting at a low jacket temperature) with that of the case of starting at a high jacket temperture. If one starts at a high jacket temperature (point 9) there is a single high reactor temperature, which decreases as the jacket temperature is decreased (points 8 and 7). As we move slighly lower than the high temperature limit point (point 6), the reactor temperature drops (also known asextinction) to a low temperature (point 2). Further decreases in jacket temperature lead to small decreases in reactor temperature. The hysteresis behavior discussed above is also known asignition-extinctionbehavior, for obvious reasons. Notice that region between points 4 and 6 appears to be unstable, because the reactor does not appear to operate in this region (at least in a steady-state sense). Physical reasoning for stability is discussed in the following section. Conclusion and future work Finally the conclusion is that a small study on the continuous stirred tank reactor and its model equation after going through we come to know its importance in the chemical engineering field and also its significance as a chemical reactor The future work is that we have to calculate and prove the equation of the continuous stirred tank reactor using Laplace transformation and check it using the MATLAB he equation of the continuous stirred tank reactor using Laplace transformation and check it using the MATLAB

Crisis in Software Patents and Copyrights Essay -- Intellectual Proper

Crisis in Software Patents and Copyrights Introduction Gaining the knowledge and skills to provide computer technology products, services and software requires a significant amount investment of both time and money. The individuals who do such a work should receive financial rewards for their efforts. These rewards create an atmosphere of creativity and competitiveness that becomes a driving force of the economy of the world. The products of this creativity must therefore be protected and we call it intellectual property. Simply, intellectual property is a product of human intellect that has a commercial value. There are three major mechanisms that US law offers to protect software intellectual properties. These are trade secrets, copyrights and patents. Trade secrets have broad applicability to various subjects that can range from microprocessors to sorting algorithms. Trade secrets are valuable because they are separate from patents and copyrights, and even can be available when copyright or patent rights are not. The basic premises of trade secrets are satisfied when knowledge is kept in secret and not commonly known. Copyrights protect all types of original creative expressions that are produced by programmers. Copyright law does not protect the ideas and concepts underlying an expressive work. It only protects the literal form that the expressive work takes. Patent law gives the inventor of a new and non-obvious invention the exclusive right to use that invention for a limited term. Patent protection offers the broadest protection for technological industry. A software patent protects against unauthorized use or sale of software that is defined as an invention. In order to obtain a patent, the inventor is ... ...pers haunted by Patent madness† 5 The British philosopher who developed a duty-based ethical (deontological) theory 6 Arnold W.Bragg. Software Patents 7 National Research Council. The Digital Dilemma. References: Deborah G.Johnson and Helen Nissenbaum. Computers Ethical & Social Values Prentice-Hall, NJ, 1995 Kallman & Grillo. Ethical Decision Making and Information Technology, Mitchell McGraw-Hill, CA, 1993 National Research Council. The Digital Dilemma, National Academy Press, DC, 2000 Richard W.Severson. The principle of Information Ethics, M.E.Sharpe,Inc, 1997 IEEE Software. Karl Dakin, What if there is no software piracy? January 1997 IEEE Software. Gregory Ahoronian. Does the Patent Office respect the software community? July/August. 1999 IEEE IT Professional. Arnold W.Bragg. Software Patents. July/August 2001

Elephant Man :: essays papers

Elephant Man The Elephant Man, written by Bernard Pomerance, is a play about identity. It is a play about a man who is deformed, but constantly trying to live life as an ordinary person. The play begins with John Merrick, also known as the Elephant Man, performing in a carnival freak show in order to make a minute amount of money for living expenses. In Scene VI, Even on the Niger and Ceylon, Not This, Treves brings in Miss Sandwich to become Merricks nurse. He explains to her that he has been let down so far by the other nurses he has introduced to Merrick. He prepares her for the sight of Merrick so that she will not react harshly when she sees him. Ironically she says, â€Å"Appearances do not daunt me.† Treves then offers her the opportunity to see Merrick for the first time and bring him his lunch. When laying eyes on Merrick, she becomes frazzled and bolts from the room, throwing the lunch tray into Treves arms. When Treves goes to speak to Miss Sandwich she states that no one will do the job. This scene contributes to the other scenes of the play because it is a prime example of how people react when meeting Merrick. Merrick struggles with trying to fit in mostly because of his low self-esteem as a result of the cruel reactions of people. People do not give him a chance and get to know him well enough to see the kind and gentle personality traits of John Merrick, all they see is his physical deformities and that alone scares them away. As the play goes on, people begin to look past his deformities and see that he is a true genuine person who has feelings like themselves. Merrick is given the chance to raise his self-esteem when he meets Mrs. Kendal. She is an actress who walks in with a smile on her face and is capable of sustaining the smile. She talks to him as if he is a human being and not a freak. She introduces many members of the elite class to John Merrick and they all react just as she did, looking beyond physical characteristics to the person he is inside.

The Grand Illusion and Social Identity

War leads to the massive loss of life, the non-recognition of human rights and dignity. But then, amidst its horrors, great acts of humanity are committed by people of various social backgrounds. Violence and conditions of uncertainty transform social identities with regards to ethnicity and class, enabling men to aid others for the very reason that they are fellow humans. This paper expounds on this idea through insights from a film classic, a sociological theory as well as common knowledge history.Background of the FilmThe 1937 film â€Å"The Grand Illusion† was one of the masterpieces of French director Jean Renoir. Having served in the First World War himself, Renoir witnessed first hand the gruesome experiences of being powerless in the face of an oppressive situation. He sought to express his anti-war sentiments through film. Although he used World War I as the setting, the film came at a time when the world was once again at the brink of another.The film underscores the theme that war is not the answer to society’s problems but rather exacerbates them. It shows how the elite or the aristocracy resorted to war in order to sustain and expand economic and political interests. Prior to World War II, the Jews began to dominate Germany’s economy with the superb entrepreneurial skills peculiar to their culture that enhanced their social mobility.The success of the war depended on the support of the citizenry whose bulk was composed of the middle and working classes. For Germany, the single greatest binding force that united them together was in the ethnocentric conception of the superiority of the German race. This was compounded in the narrow nationalist promotion of â€Å"Germany for Germans†. Both ideas worked to entrench a strong Anti-Semitist sentiment in the country.This shifting of social identities towards the ultimate expression of humanity in war is effectively captured in â€Å"The Grand Illusion†. Here, social iden tity stems from the recognition of one’s membership in a social group united through similar roles and viewpoints (Stets and Burke, 2000, p.225). Renoir’s intention was to portray the transcendence over ethnicity and social class as illusions, aptly because they are the glaring opposite of social reality.Social Identity and TranscendenceSocial Class across NationalitiesFrench-German AristocratsThe film portrayed the universality of social class and the common group identities of similar social classes across borders. The German Captain von Rauffenstein is seen inviting his prisoner, the French Captain de Boeldieu, to lunch just because the latter was an officer, and so, a fellow aristocrat. Their identification with one another stems from their common fulfillment of the roles and expectations associated with their class.The scenes that followed showed them enjoying each others’ company thus forming an in-group, highlighting their difference (in-group favoritism) from the commoners, the out-group. They talk animatedly about experiences privileged to the elite – cuisine, women and familiar people. Their use of German, French and English further emphasizes their ability to overcome the German-French and prisoner-captor divide.Stets and Burke (2000) stated that â€Å"in-group homogeneity is especially strong when no motivational forces exist to distinguish the self from others within the group†(p.226). In the final scenes, Captain de Boeldieu distracts the German guards to enable his two companions to escape. German Captain von Rauffenstein tried to talk him into submission first but was forced to shoot him. De Boeldieu was a fellow aristrocrat (part of an in-group) but more than this, he was also a French officer, an enemy (motivational force).The scenes depicting the dying de Boeldieu talking to von Rauffenstein saw how identity roles take center stage over group identity. Though both of them see their identity as aristocrats, in the process of the war, they came to see their roles differently. Von Rauffenstein believed in the purpose of the war while de Boeldieu believed that their class was dysfunctional and welcomed the possibility of society being led by the lower class.Similarly, identity roles taking precedence was illustrated in de Boeldieu allowing Lieutenant Marechal, his fellow aviator who was a mechanic before the war, to escape. Group identity would dictate that de Boeldieu, in order to perform his duty, would take advantage of the situation for himself. But because he saw his identity role differently, he died allowing a commoner to regain his freedom.French-German CommonersThe transcendence over social class across nationalities was also demonstrated during the escape of Marechal together with another prisoner named Rosenthal who was a Jew. Traveling on foot over unfamiliar and hostile territory presented difficulties and was further exacerbated when Rosenthal sustained injuries. As such, th ey were forced to ask for help at the farm that they came across with.The resident was a German woman, Elsa, whose husband tragically died fighting in the war. She shared a similar identity with Marechal who also came from a working class background. The common realization that there is much to lose in the war but none to gain (similarities), led both Elsa and Marechal to overcome differences in nationality and language barriers for the woman to help the fugitives.Ethnicity and Social IdentityOne of the characters in the film was a Jew named Rosenthal. He belonged to the upper class but was originally a commoner. The film dispels the exaggerated dissimilarities that led to prejudicial or Anti-Semitic sentiments when Rosenthal’s character was portrayed as compassionate. Although he was upper class, he gave parts of his meals to his fellow prisoners without exception. Thus, he maintained favorable relationships with all captives in the camp.This suggests that Rosenthal as a Jew and the non-Jew prisoners overcame ethnic differences because their identity was primarily based on all of them being prisoners (social group). Thus they performed a common role and viewpoint – to dig a tunnel and escape in order to return to their respective territories and continue performing their duty to fight against the common enemy. Here, the German guards are the out-group.ConclusionThe transcendence over social identity is easily accomplished under circumstances of chaos and instability that are not conventional during times of peace. This is because as social experiments have proven, divisions between groups are minimized when there are common goals that can only be achieved through collective efforts (SIT lecture). In the film, prisoners from different classes and ethnicities worked together to dig a tunnel as a common means of escape. The sharing of food for equal sustenance to all was also depicted, albeit through Rosenthal as an individual, increasing everyoneà ¢â‚¬â„¢s chances of survival.Transcendence on an individual level can also be accomplished when one’s perception of identity role deviates from the traditional group identity boundaries, i.e. de Boeldeiu’s self-sacrifice for a commoner as a way out of the aristocrat failure as a class in contrast to von Rauffenstein’s steadfast conformity to aristocratic duties. The latter’s conformity is due to his commitment of a role that is salient to him (Stets and Burke, 2000, p.232).As social identity results from comparison of one’s self from others and recognizing the similarities in experience can also lead one to transcend socially defined divisions. This was exemplified in the relationship of the French Lieutenant Marechal and the German peasant, Elsa.Non-transcendence on the part of the German guards and their officers, who represented the German state under Hitler in history, was due to their segregation of themselves as a superior race and their dete rmined attempts to compete over economic and political superiority as well.In general, the film has been rich in examples showing how social identification leads to social conflict and also to conflict resolution. The lessons borne out of this classic film are invaluable as we face a world today where war seems to be the solution to contradictions among nations, races, ethnic groups and social classes.List of ReferencesStets, J.E. and Burke, P.J. (2000). Identity Theory and Social Identity Theory. SocialPsychology Quarterly, 63(3), p.224-237.Social Identity Theory Powerpoint (Lecture).