Cambridge Engineering Selector Essay Example for Free

Cambridge Engineering Selector Essay Apparatus Computer Cambridge Engineering Selector database program Theory The Problem Below is a brief description of the theory regarding this lab: Oars are light, stiff beams. They must also have reasonable fracture toughness (KIC) and acceptable price per unit mass (Cm). The performance index for a light, stiff beam is: M1 = E1/2/? Where E is the Youngs modulus and ? is the density. To select the best materials, perform two selection stages: (i) In stage 1, select materials with M1 7 (GPa) /(Mg/m) (ii) In stage 2, select materials with KIC 1 MPa. m and Cm 100 GBP/kg. CES Selector Materials for Oars: The solution The performance index for a light, stiff beam (M1) is plotted in stage 1. Density is plotted on the x-axis and Youngs Modulus on the y-axis. A selection line of gradient 2, through the point (1.0, 49) is plotted. The constraints on adequate fracture toughness and price are plotted in stage 2. Fracture Toughness is plotted on the x axis and Density on the y axis. A selection box whose upper left corner is at (1.0, 100) is defined. In stage 1, the line representing the performance index is moved up until only a small subset of records remains in the selection. Magnified views of the two selection charts are shown in figures M5.3.1 and M5.3.2 (results intersection and hide failed records on), and the materials passing both stages are shown in figure M5.3.3. Oars for competitive rowing are made from Spruce, or (better) Carbon Fibre Reinforced Polymer (CFRP). Low Tech oars have been made for centuries out of bamboo. Boron Carbide might be acceptable, but it would be too brittle, despite its moderate fracture toughness. Selection Stages The selection methodology behind CES Selector is described in section 1 of the online book CES In Depth Background on Selection Systems. The application of this selection methodology to a specific area (e.g. the selection of the optimum material for an engineering component) is dealt with in the section of CES In Depth for the relevant data module. Before any selection can be performed, the user must specify which of the data tables will be the Selection Table (e.g. Materials, Process etc). This is done in the Project Settings dialog box (or on the Welcome screen when CES is first opened). Only one table can be used for selection in a given project. The filter and form for each data table must also be specified. The recommended filter and form combination for each type of selection is listed below. Selecting records with Selector involves performing a series of independent selection stages. On each stage, the user selects a subset of records. Every record in the current filter for the Selection Table is considered during each stage, and the program automatically keeps track of all the results. One way to perform a selection is to use a Selection Chart. The two axes of a selection chart specify record attributes. The user selects the area of the chart that fulfils the selection criteria. One selection chart is used for each selection stage. A second way to perform a selection is to use a Limit stage, in which numerical limits for one or more attributes are entered in a table. Limit stages can be combined with graphical stages (using selection charts). A single functional requirement (e.g. the strength/density ratio of a material) can be represented by one stage in Selector. In many design situations it is necessary to identify records that satisfy several functional requirements simultaneously, for example high strength/density, high stiffness and low cost/kg for a material. In these cases Selector can perform several selection stages and the program will store the results of each stage automatically. The selection stages can be modified at any time if necessary. At the end of the selection (or at any other time), the user can find out which records passed all, or some of the selection stages. It is important to realise that in this strategy, all records contained in the selection table with applicable data entries are considered in every selection stage (and are plotted on the charts). Therefore each stage is independent of the others. This means that records are never discarded from the selection process, even though they may fail a particular selection stage. So it is possible to find out how every entity performed on each of the stages. The ones that pass all stages will probably be the best choices. Selector can also generate plots of user-defined attributes, which are mathematical combinations of the attributes in the database. Examples are the specific strength el / (el is the elastic limit and is the density), and the performance index for a light stiff beam E / (E is the Youngs Modulus). This facility greatly expands the versatility of the selection process and enables two complex performance requirements to be compared on one selection chart. CALCULATION OF THE GRADIENT FOR BOTH GRAPHS The gradient of the lines in both graphs were calculated using the performance index for the bending of rods, the formula used was: E/P = Youngs Modulus / Density In order to get the above equation into the correct term for a gradient or a curve (y=m x + c) both sides of the equation had to be logged: LOG E LOG ? = LOG C Transpose for LOG E LOG E = LOG ? + LOG C The equation for a straight line is y = mx + c From the above it is fair to mention that: Y = LOG E X = LOG ? M = 1 The performance used in this lab was E 1/2 / P = C If you take log on both sides of the equation above: 1/2 LOG E LOG ? = LOG C Transpose for 1/2 LOG E: LOG C + LOG ? = 1/2 LOG E Multiply both sides by 2 to get LOG E LOG E = 2 LOG ? + 2 LOG C From the above it can be assumed that: Y = LOG E M = 2 X = LOG ? C = 2 LOG C M (The gradient) = 2 The gradient in the first graph of Density Vs. Youngs Modulus is 2. If another performance index is used: K IC / p = c The log of both sides of the equation gives: 2/3 LOG K ic = LOG ? + LOG C Multiply both sides 3/2 gives: LOG K ic = 3/2 log ? + 3/2 log c Y = LOG K ic M = 3/2 X = LOG ? C = 3/2 LOG C M = 3/2 = 1.5 The gradient of the line in the second graph of Fracture Toughness Vs. Density is 1.5 Method The Cambridge engineering selector was the program that was used in order to get the desired materials. The main two properties that the chosen material requires are strength and toughness. In order to get the right material two graphs had to be plotted. The first graph was Youngs Modulus vs. Density and the second graph was Fracture toughness vs. Density. The first thing that had to be done was to select the right units, which are SI units. This was done by going onto Tools, selecting options and then the correct units and currency which was GB Pounds. Select New Project from the File menu Choose the New Graphical Stage command from the Project menu. The Graph Stage Wizard will appear, ready to define the x and y axis of your chart. The procedure for selecting attributes for plotting on the selection chart axes is the same for both axes (and whichever selection table). The steps are as follows: The X-Axis page is presented first. To specify a single attribute, click once on the down arrow to display the drop down list box. Select one attribute, Density. (The Advanced function could be used to create a combination of attributes for one axis.) The title can be changed by the user by typing in the Title field if desired. Let the settings for the axis Scale remain as the default, Logarithmic and Autoscale. You can change the scales to linear and back again, by clicking one of the radio buttons marked Logarithmic and Linear. To switch to the Y-Axis page click once on the other tab. Select the attribute Youngs Modulus from the drop down list box and let the scale be Logarithmic and Autoscale. Click once on OK to exit the dialog. The graph will then be created. Follow the same steps to create the other graph except this time, the y-axis is going to be Fracture toughness. Once both graphs are created, the gradient, which was worked out earlier, has to be put in. In the graph showing Youngs Modulus vs. Density the gradient is 2 and for the graph showing Fracture toughness vs. Density it is 1.5. To put in a gradient line, simply click on the icon on the toolbar which has a picture of a gradient on it. Then a box will appear asking you to enter a value for the gradient. Once the value of the gradient is entered, the gradient will appear on the graph. The line can be moved up and down the graph depending on what kinds of materials are needed. In order to narrow down the number of materials to a few, the line has to be moved carefully upwards until only a few materials are shown in the box. This has to be done for both graphs until only 4 or 5 materials appear in the box showing both stages. Results Engineering Materials Lab All Stages Name Identity Epoxy/HS Carbon Fibre, UD Composite, 0à ¯Ã‚ ¿Ã‚ ½ Lamina MXP_CFTSEPHCUD001 Low Density Wood (Longitudinal) (0.22-0.45) MNW_L_LD Medium Density Wood (Longitudinal) (0.45-0.85) MNW_L_MD PEEK/IM Carbon Fibre, UD Composite, 0à ¯Ã‚ ¿Ã‚ ½ Lamina MXP_CFTPPEICUD001 Conclusion After looking and analysing the results taken from the two graphs, the materials chosen were Epoxy SMC (carbon fibre), low density wood, and medium density wood. ). But in the economical end of manufacturing rowing boat oars, both the wood materials would be selected, as they are reasonably cheap to buy, whereas carbon fibre is more expensive. Costs of materials are not the only concern, as the usage of each material is just as important. Questions could be asked; such as, how often is the boat going to be used? Is it going to be used on a regular basis? All of these questions should be taken into consideration before a decision is made. If an average person who is not a professional rower was going to consume a rowing boat ore, he/she would be better off opting for the one made from low density wood as the wooden ore is a great deal cheaper. On the other hand if the same question was asked to a professional rower, then the rower would pick the ore made of carbon fibre since the price does not come at the top of the list of concern and winning the race is the major objective. Basically, there is a good point and a bad point on each material. This largely depends on the object of buying the ore. If it is to win a race then money is not an option and the consumer would be better off buying the one made from carbon fibre but if the object is to just go rowing for a weekend then the best option would be to go for the oar made from wood simply because there is no likely consistent further use for the ore.

The Slavery of the Millennium Essay -- Ethical Issues, Sex Traffickin

It is common ideology that slavery is a thing of the past. This is far from true; sex trafficking is prominent all across the world on a massive scale and is the new form of slavery. According to the U.S. Department of State estimates that 560,000 women are trafficked each year across international borders and forced into the sex industry. {{34 Holman,M. 2008; }} Other non-government programs such a UNICEF have these numbers in the millions. {{34 Holman,M. 2008; }} The real numbers of sex trafficking are unknown, but the problem is evident. The general public is unaware of the sex trafficking epidemic because the forced labor business is not only inhumane: it is well hidden. The business is kept underground due to the stigma associated with prostitution. Because of this most of workers of the business are from â€Å"forced recruitment†. {{25 Samarasinghe,Vidyamali 2007; }} Sex trafficking is not only an issue over seas, it is also a problem in the United States a culture tha t â€Å"glamorizes pimping and prostitution."{{31 Kotrla,K. 2010; }} This culture of tolerance, fueled by the glamorization of pimping, is embodied in multiple venues of daily life, including clothing, songs, television, video games, and other forms of entertainment. Traffickers easily control victim of their trade by using techniques such as â€Å"force, fraud, or coercion, including techniques such as confinement, beatings, rape, confiscation of documents, debt bondage, false owners of employment, and threats of harm to the victim or the victim's family.†{{30 Potocky,M. 2010; }}Once in the business, it is almost impossible for a victim to escape, and if they do they are not likely to come forward to authorities. There are four main ways out of sex trafficking enslavemen... ...ggling are often confused as activities, and the police and immigration officials are ill-equipped to recognize and respond to the problem as one involving victims as well as offenders.† (28) [add to this] If these simple changes are implemented to the standing sex trafficking legislation, mainly the Victims of Trafficking and Violence Protection Act implemented in 2000 failing in its attempt to prevent trafficking, protect victims, and prosecute traffickers. The TVPA will be up for reauthorization in November 2011. As this quickly approaching, it is imperative the public is educated on the human exploitation that is often ignored. Sex trafficking is a global problem that can only be taken down by the help of a government that recognizes the weakness in its current policy. The victims and the public deserve better than the U.S. government has done thus far.

At universities and colleges Essay

In today’s society, a large number of the students in universities and colleges have less physical exercise than ever before and hardly go out of the campus to have some social activities. Many people argue that students pay more attention to the study than their health which may because they[SQQ1] do not get enough financial support. As to this problem, I hold the opinion that sports and social activities are just the same significant as classes and libraries and receiving equal financial support can have many benefits though it still has some shortages[SQQ2]. In what follows, I will illustrate my point of view. First of all, today’s students need to face more challenges which means they specially should have a better body[SQQ3] to fight for their future. Enough sports and social activities can help them become healthy not only physically but also mentally. As we can see, some of the students in universities choose to end their own lives because of their pressure on scores or other things and we can easily find most of these students hardly do exercise and even never go out to do social activities such as volunteer work. If this part of the students can regard sports and social activities quite important, they may have a healthier psychology and may not end their own life[SQQ4]. Secondly, if the universities can give sports and activities equal financial support as classes and libraries and build up enough gyms and exercise areas, it can be more convenient for students to keep fit. Because of the schools’ support, the students do not need to go out of the school to do social activities and they can find more chances in school campus like joining the school’s Red Cross to visit the local welfare center for children. Also, the increasing sports place can even bring students the convenience to do any sports any time they like. However, it can still have several disadvantages. For example, the schools  may have less money than before to support students’ study which means the school may invite less famous professors from all over the world to make speech for students. In conclusion, I hold the view that sports and social activities should be regarded as important as classes and libraries and should also get the same large amount of financial support which can help the students have a healthy body physically and mentally. These two facto

1984 Is A Love Story. George Orwell’S 1984 I Believe Is

1984 IS A LOVE STORY George Orwell’s 1984 I believe is a love story. A nation where everything you do is under a surveillance, is hard to do anything. In Oceania love was one thing that the party did not like any one to have. As a matter of fact, it did work, because it ended Winston’s first marriage with Katharine in separation which was a painful situation for Winston. The party did not want anything to do with love. They wanted to get rid of everything except big brother, and anyone who tries gets tortured. The party was a love destroyer throughout the novel, and was very successful with it. Winston and Julia had to hide their love life throughout the novel. He knew if they get caught, it will not end well for the both. Winton still†¦show more content†¦Winston never saw his mother after that, whether she was alive or dead. The love between Winston and Julia at first was abomination. Winston did not love Julia to start with. He thought Julia was a spy from t he party spying on him. Winston was very curious to know what it is that Julia was staring at him most of the time. Once he received the note from Julia which read I love you, that changed his whole mind and wanted to talk to her even more. They could not talk in public because of the telescreen and the helicopter hovering around. There was no privacy for love under Big Brother. Winston followed Julia’s direction to the country side where they had their first privacy without the telescreen. To me that was love, because even though she said I love you first with the note, it could had been a set up, but because he loved her too he decided to meet with her. Once Julia told Winston she was not with the party and if fact she hated the party members, Winston got more attracted to her because he had found someone who hated the party as much as he does. Winston and Julia sneaked around, and finally Winston rented the room above the store. 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