Migration Impact on the UK's Economy between 2005 and 2015 Dissertation

Migration Impact on the UK's Economy between 2005 and 2015 - Dissertation Example Interpretation of the findings will help the researcher to draw inference to the research questions or the main agenda of the research and accordingly arrive at the conclusion. Chapter 2: Literature Review World migration and economic growth is considered to be an ever-researched subject in the contemporary economics. S. P. Kerr and W. R. Kerr have defined net migration in an economy during a particular period of time as the difference between total number of immigrants and emigrants within the economy within that specified time period. In this context, immigrants are defined as the individuals who migrate or shift to another country whereas emigrants of an economy are those who shift from other economies to a particular economy within the specified time period. In this chapter, global migration and the tendency behind this, the effect of migration on a particular economy and finally, the consequences faced by the economy of United Kingdom will be analysed in the light of theoretical framework and economic models. 2.1. Economic Factors Influencing Migration According to the economists, economic migration occurs mostly due to the influence of two discrete factors. These are as follows: 2.1.1. Push Factors Many economists such as Boyle, Halfacree and Robinson have identified that lack of economic opportunities, scope for higher education, quality jobs in both technical and non-technical sectors act as push factors and drives individuals to migrate in other part of the world.

Magnetic Resonance Instrumentation Essay Example | Topics and Well Written Essays - 750 words

Magnetic Resonance Instrumentation - Essay Example This is achieved by increasing using multiple turns of the coil to increase its sensitivity, to allow high duty of pulsing. At the same time, the design will consider the inductance of the coil gradient, which will have to be minimized. The components of the MR system that are important in this regard include the gradient amplifier, voltage across the inductive, and the resistance across the gradient coil. Q3. The effects of gradient G(r) on Larmor processional frequency at a position r is to change the processional frequency at this position r. Q4. The optimal separation of two current carrying loops to produce as linear a magnetic field gradient as is possible at the centre of the two loops is when 2Z1 =, where a refers to the coil radius. The reason as to why this separation is different from the necessary one to produce a homogenous field is because separating the field in that manner help in generating relatively pure fields. Q5. Slew rate refers to the maximum gradient strength as a factor of the rise time (Vmax/L). The slew rate needs to be as large as possible because it helps in stimulating the peripheral nerves of the human body, thereby creating a â€Å"crawling† type sensation on the skin. Q6. Reason why it is necessary to shield gradient coils: This is done mainly to reduce the net inductance of the system Q7. Type of effect caused by gradient coil shielding to reduce combat the effects of eddy-current induced magnetic fields. Q8. The causes of undesirable sounds produced by magnetic resonance imaging at runtime are due to gradient coil experiencing magnetic forces and torques when being pulsed. The reason is that as the coils get physically restrained, the energy associated with the magnetic forces is released acoustically as loused sound. The undesirable sound can be reduced by: Designing a gradient coil that are torque and force balanced; Shaping the gradient pulses to reduce sound produced; Using acoustically absorbent formers for the co ils; Encasing the gradient coils in an evacuated chamber so that waves of the sound are not compatible. Q9. The main cause of nerve stimulation due to magnetic resonance imaging is the slew rate push and the maximum gradient strengths that induce field in the patient, thereby stimulating the nerves. This is mainly observed by experiencing a â€Å"crawling† type sensation on the skin. It can also be observed through twitching of muscles as the nerves get stimulated. Q10. The causes of impurities in the static magnetic field (BO) include: The patient and radiofrequency coils in the DSV, which may alter the magnetic field due to their magnetic properties; Imperfection in the magnetic manufacturing process; Installation site where ferrous installations done near the magnet may end up altering the homogeneity of the magnetic field over the DSV. Q11. The two types of image quality reduction caused by zonal impurities in the static magnetic field are: Artifacts; Homogeneity. Part B The three topics in my order of preference are: 1) Interventional MR system; 2) MR gradient coils: action and performance; 3) RF resonators for MR applications. The main reason as to why I have chosen the three topics is due to my desire to learn more about them so that I can acquire more knowledge