RAIL TRACK DESIGN FOR LINE SPEED IMPROVEMENT Essay

RAIL TRACK DESIGN FOR LINE SPEED IMPROVEMENT - Essay Example The design issue under consideration includes route surveying, track component identification, designing the rail curve and other design aspects that help in improving rail transport. Suggestion indicated can be implemented by any train organization seeking to improve or optimize there services (Mundrey, 1993). Rail tracks are used for the guidance of trains, and consist of two steel rails laid in parallel. The rails guide the train in motion without the need for steering. The rails are laid on sleepers. The sleeper are also referred to as the cross ties. The sleepers are embedded in the ballast and form the rail road track. The rails are fastened to the sleeper by the use of spikes, lag screws, bolts clips and pandrol clips. The type of fastening sleepers depends on the type of sleepers. For the concrete sleepers clips are used, for the wooden sleepers' spikes are used and for steel sleepers, bolts are commonly used. Convectional rail design involved route surveying and finding the most economical route for the rail line. The engineer worked on ways of designing the rail so as to surpass the geographical obstacles (Engineering Policy Group (EPG). 2009). Currently rail design encompasses many design aspects. These design aspect results from the need for greater speeds and heavy loads. Due to these factors, the most important consideration for the rail design are: Route surveying. This involves planning the rail routes so that it passes through the most economical route (Hickerson, 1967). Long term traffic levels; if the projection shows that in the long run the traffic will increase. Design consideration for expansion of the rail as well as incorporating trains with high speed and heavy should be taken into consideration. Environmental concern: the design should focus on an environmental friendly rail that does not damage the environment. Politics: Government influences and funding greatly affect the quality of the rail and also its long term benefits. Land issues; when designing for increased speed, huge curves are required; the constraining factor to this is the limitation of land. Economic factors: this determines the type of rail constructed. Well funded projects can archive most of the design requirements. Design of The track bed The rails are laid on a bed of stones, ballast is commonly used. The bed is comprised of the following major layers; The subsoil: this is the natural ground in which the rail is to be laid. The sub grade: this comprises of compacted soil. The compaction and removal of clay from this layer prevents the expansion and compression preventing the sinking of the rail which damages this track. The soils used in this layer must not expand or compress due to water absorption. Compression of the soil also helps is preventing the infiltration of water and clay. Blanket: this is a layer of stone dust or sand, it is mixed with impervious plastic. The layer prevents the upward infiltration of clay and water which may destroy the rails. Ballast: This is a layer of stone. The type of stone used and the grade of the ballast determine its load bearing

Mutual Advantages For Trade Between Usa And Mexico Research Paper

Mutual Advantages For Trade Between Usa And Mexico - Research Paper Example Goods were sold at high profit by the Americans. The minimum price of a good was 5 cents and 10 cents was considered to be an eighth of a dollar. This shows the devaluation of other currencies in comparison of the US Dollar was prevalent even then. 2 Benefits from Trade in the 18th Century â€Å"The Santa Fe Trail developed into a complex web of international business, social ties, tariffs and laws†.3 The Americans exchanged merchandise, horses and oxen in return for silver bullions from the Mexicans initially. With deepening of friendly relations and growth of trade between the Americans and Mexicans, the variety and volume of trade grew, too. The shrewd Americans identified the need for cotton prints, factory products, latest gun and ammunitions and whiskey of the Mexicans, which they supplied profitably. On their return back home, they purchased wool, buffaloes, hides and horses, mules, gold coins, gold dust and silver from the Mexicans which earned them great revenues, in turn. Thus, what followed was symbiotic relation between the two countries through a series of trade transactions.4 Apart from the material aspect to these transactions, there were other benefits as well. Due to the long period of trade between these two countries relations formed between the white men and the native women of Mexico and many of them married these native women Dr. Eugene Leitensdorfer from Missouri, married a Mexican women named Soledad Abreu, who was the daughter of a former governor of Mexico.. This proved to be advantageous for the Americans as these women worked as labor in their fur and skin trade. They also served as mediators between the Mexican men and their business partners.5 Americans who maintained good... However, after trade relations had lasted for a considerable period of time, the Mexicans began to wonder if the price for this growth was outweighing its benefits. It was evident that the Americans were gaining far more from the trade than the Mexicans. The net result was a transfer of wealth to the west and by the time the Mexicans realized this, it was too late. The indigenous traders had been completely uprooted by the foreigners and the Americans exercised abundant power over the native markets.The congenial trade relations between the two countries have remained unchanged till this century. Mexico is the second largest exporter of US exports and around 11% of its exports are from the US. It is also the third largest trading partner of US forming 10% of US imports and these figures are still rapidly increasing. Around 82% of Mexico's exports go to the US and the trade between them has grown in the last ten years. However, even today the US maintains trade advantages over Mexico as Mexico can never match the US in terms of efficiency and productivity. Thus, the exploitation of Mexico by the US to remains unchanged and the US is the ultimate gainer. It can be concluded that the trade relations between US and Mexico have remained strong from the 18th century along the Santa Fe Trail till present day. The trade between them is highly disproportionate with the US reaping the maximum rewards. This scenario may be altered by the adoption of adequate policy measures by the Mexican government.

Media Use in Identity Construction Essay Example for Free

Media Use in Identity Construction Essay In society today the construction of a personal identity can be seen to be somewhat problematic and difficult. Young people are surrounded by influential imagery, especially that of popular media. It is no longer possible for an identity to be constructed merely in a small community and only be influenced by family. Nowadays, arguably everything concerning out lives is seen to be ‘media-saturated’. Therefore, it is obvious that in constructing an identity young people would make use of imagery derived from the popular media. For example, it is becoming increasingly common for young children to have their own television and music systems in their bedrooms whilst also having easy and frequent access to magazines especially aimed at the ‘developing’ child and/or teenager. Such young people would also have a way of accessing the Internet be it at school or sometimes at home. However, it is fair to say that in some instances the freedom of exploring the web could be limited depending on the choice of the parents or teachers. So, if young people have such frequent access and an interest in the media, it is fair to say that their behaviour and their sense of ‘self’ will be influenced to some degree by what they see, read, hear or discover for themselves. Such an influence may include a particular way of behaving or dressing to the kind of music a person chooses to listen to. These are all aspects which go towards constructing a person’s own personal identity. By close investigation into the popular media, and by using two specific examples of a popular teen magazine and a recent ‘teenage’ hit single that got to number 2 in the British charts, I intend to illustrate the various ways in which young people make use of imagery derived from popular media in the construction of their identities.

Wellbore Instability and Borehole Breakout

Wellbore Instability and Borehole Breakout Introduction: Despite the development of oil and gas industry technology, Wellbore instability remains one of non productive time that cost industry billions every year. wellbore instability has been one of the well planning stage and been studied widely (Bradley,1979; Bell, 2003; Zhang et al., 2003; Gentzis et al., 2009; Zhang et al., 2009; Ding, 2011). Drilling through a formation led to stress changing a round the borehole due to rock removal. In this analysis, mud weight pressure is the controllable parameter during the drilling. The mud weight pressure effects can cause two failure mechanisms which are shear failure (breakout) and tensile failure (fracturing), these problems consider as the main wellbore failure. Borehole breakout happens when the mud weight is lower than expected. in other word, the breakout failure occurs when the stress imposed by drilling mud lower than compressive strength. On the other hand, higher mud weight can lead to tensile failure due to invade of mud into the fo rmation. The consequences behind these problems are stuck pipe, reaming operation, lost circulation, and sidetracking. To eliminate these problems many parameters should be considered such us rock strength, pore pressure, in-situ stress, and stress orientation. Furthermore, breakout and fracturing can be diminishing or eliminate by choosing the suitable mud weight for drilling. By using a constitutive model to predict the stresses around the wellbore connected with a failure criteria, Strength of reservoir rocks can be calculated. Hence, selection of the suitable failure criteria will consider as the main part of wellbore stability analysis. Borehole breakout is an enlargement and elongation of wellbore in a particular direction and it considers as the important indicators to predict the orientation of min. horizontal stress. This enlargement can be predicted by using 4-6 arm caliper tool, Optical imaging log, resistive image log, and acoustic image log (Jaeger et al.,2009; Bell and Gough, 1979; Zoback et al.,1985).   Figure (1) shows wellbore enlargement pattern via 4 arm caliper. The 4 arms caliper has 4 pads in two calipers (pad 1 and 3) represent Caliper 1 (C1) and (pad 2 and 4) represent caliper 2 (C2). The diameter of the hole can be identified from those two calipers. Fig 1a represents an in-gauge hole cause C1 and C2 have same reading of bit size. In contrast 1C shows a severe washout in hole size and caliper reading show this enlargement. Stand on well logs data and empirical equations, the rock strength and mechanical properties can be obtained (Rahimi, 2014). (Westergarrd. 1940) in-situ stress can be obtained by elastic characteristic equations. Also, from elastoplastic characteristic equation in-situ stress can be calculated (chang et al., 2006). As well , (LOT) and mini frac. test can help us to determine in-situ stresses (Bardley 1979b). Many models have been built to determine the induced stress in a circular well and predict the suitable mud pressure by using Failure criteria. In this analysis, three failure criteria have been used to predict the proper mud weight in the Nahr Umr formation in southern Iraq. The three failure criteria are Mohr-coulomb, Mogi-coulomb, and modified lade. Fig (1) Caliper log responses due to wellbore enlargement (Tingay ) Geological properties of the field and the target reservoir. The H oil filed is a land-based field located in southeastern Iraq between the city of  Basra and the Kuwait border (Figure 2). The field is an anticline that runs roughly north-west to south-southeast approximately 60 km long and 10-15 km wide. The anticline of H field has four domes divided by saddles, from the northwest to southeast these are: Al-Hamar Shuaiba Rafidyah Safwan Fig (3) The four domes in H filed The discovered reserves are contained in five reservoirs: Mishrif, Nahr Umr, Zubair 3rd Pay, Zubair 4th Pay and Yamama. (Figure 3) represents well stratigraphic. Nahr Umr Formation is an interesting potential water source zone due to the abundance of log data through the unit, water salinity that is compatible with the Mishrif and Zubair Formation waters, and the reported extent and strength of the aquifer. It is composed mainly of Sandstone interbedded with streaks of (Shale, Siltstone Limestone). Average thickness of Nahr Umr formation is +/- 260 m and the porosity exceed 25% with an average of 20% permeability ranges from 1000 md to 9000 md. Depends on information from more than fifteen wells, shear failure has been noticed in Nahr Umr formation specially at the shale layers. This breakout has been shown on shale shaker and by caliper log. Fig (4) stratigraphic of H field

City on a hill: A new nation is born :: essays papers

City on a hill: A new nation is born The city on a hill idea was first taught by the puritans that came from Europe, that wanted America to be a shining example to all the world. It was to be a place built on new rules and new ideas. Overall, it was supposed to be a nation that rose above all the others so that it could be marveled at and copied. In this paper it will be proven that the federalist approach to how the â€Å"City on a Hill† idea should be put into action was superior to the ways of the anti-federalists because of three things that they did:1. Protected the people from tyranny, 2. Provided opportunity, 3. Insured liberty, 4. Protected individual rights and liberty, and 5. Had a more lasting effect on the methods used for ruling our country. The federalists definantly protected the people of their country from tyranny. Before the federalists, the anti-federalists ruled the states, and they were very tyrannous. For example, they wanted all of the states to each take up a portion of the debt from the revolutionary war. This was easily payable by the larger states that had much industry, but for the smaller or less industrially developed states, this was a debt that they were just not able to handle. The federalists finally decided when they had the power that they would assume the debt as a part of a deal to move the capitol to Washington, D.C. This is just one example of how the anti-federalists tried to control the citizens while the federalists wanted to free the people and give them a chance to lead a free life. The federalist party definantly gave the people of the United States opportunity. The anti-federalists, however, did not. They not only jailed those in debt, but also they never set up a national bank to make loans so that people could cope with their debt. From setting up a national bank to helping people in debt, the federalists were able to lend money and keep people from being imprisoned for owing money. This allowed for the opportunity to grow and to expand to many of the peoples of the U.S. The federalists insured liberty by putting an end to being jailed for debt. While the anti-federalists put the law into effect that allowed people to be jailed for their debts, until the people were so tired that they staged a rebellion, the federalists got rid of this and set up the bank and took over state debts from the war.

The History of the Criminal Justice System in America Essay -- essays

The History of the Criminal Justice System in America The criminal justice system has been evolving since the first colonists came to America. At first, the colonists used a criminal justice system that mirrored those in England, France, and Holland. Slowly the French and Dutch influences faded away leaving what was considered the English common law system. The common law system was nothing more than a set of rules used to solve problems within the communities. This system was not based on laws or codes, but simply that of previous decisions handed down by judges. Although rudimentary, this common law system did make the distinction between misdemeanors and the more serious crimes known as felonies. As the colonies grew so did the criminal justice system. The colonists expa...

Dyslexia

I have had many challenges in school because I have dyslexia with my reading and my writing and my teachers that have made it very difficult to handle school work and make the good grades that I have. I found out had dyslexia at the end of my first grad year. When I got home my mom told me I had dyslexia. I was very confused what it was and what it meant for me to get rid of it. My mom told me it was a learning disability I would have to work harder than ever one else to reach my goals and dreams of going to college.I had a harder time with my reading and writing witch maid it wear I had to ask help a lot more than the other kids all them stated to make jokes but I just rose to the challenge. As got older better at the things was not good at but the teachers just tried to keep me lower then what could do. The teachers would treat me different like was not smart as the other kids. They all was gave me less work sent out to the hall because the teacher dint like the way I spelled stuff or write. Let like was stupid like I could never be eke ever one else could never be as smart in school as them. Then my mom notice was starting to do relay bad in school so my mom and dad got me a tutored. She taught me how to dill with my dyslexia and the pain it brought me. With her help did better in school work started to do all the work that was assigned to me and making better grads then ever one else in the class. Started to get my convince up and made me fill smart know that can do en thing that I won't to do just have to work a little harder on it.I can go to college and do the job want to do just like en one else. I know would not be who am without my hard work and the supporters that helped me on the way. Am, most grateful for my parents and my tutored Mrs.. Hansen. My dyslexia thought me how to be a hard worker witch have to be in order to finish college and exceed in life. Will be read for en thing that life throes at me because of my dyslexia.