不能妄称“一篇成功申请XXX牛校的PS”，只是希望这篇PS能起到一个借鉴的作用，在 [b]整体结构、行文思路、材料筛选方面。因为许多同学在最初写PS的时候都会犯相似的错 [b]误，如喜欢把一些自认为很了不起（比如作家教啦、当班上的生活委员啦）这类事情花 [b]大量笔墨来写，而把真正重要的东西省略了。 [b][b]这篇文章可以与我的前面一篇《写PS的几点个人体会》结合起来看。 [b]再次提请注意，这篇PS并不就是“适合每个人的PS”，每个人的经历不同、申请的专 [b]业不同，因此写出的好的PS应该是有各种风格的。本文仅在于对大家刚动笔写PS时起一 [b]个参考作用。 [b]－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－－ [b]－ [b]Statement of Purpose [b][b]I am writing to apply for graduate study in the Department of Mechanical [b]Engineering at UC-Berkeley. My intense interest is in heat transfer related [b]to the emerging areas of MEMS and materials processing, as well as fluid [b]mechanics and combustion. I want to become a world-class researcher in [b]these areas. [b][b]A top student from the University of Science and Technology of China [b](USTC), which is one of the most prestigious universities in China, I am [b]proud of my very strong background in my chosen field and great potential [b]for study and research, which are both key factors to a successful [b]graduate study as well as a successful research career. [b][b]The best proof of my potential for study is the fast rise of my academic [b]rank in my first year in USTC. The first semester in USTC was a depression [b]period for me and I did poorly in most subjects. However, after finding out [b]the problems with my study as well as personal affairs, I spent the second [b]semester in diligent and highly effective study, and my rank in the class [b]soared from the second half of the class to No. 2, this became a story in [b]my class at the time. Since then, I have always kept being one of the top [b]students. My excellent performance in study brought me many awards and my [b]overall rank of the four years is No.3 out of 67 students. [b][b]During the study, I always try to make in-depth exploration of regular [b]courses, rather than just earn A’s or B’s in the final exams. For [b]example, in Numerical Heat Transfer, we were required to compare several [b]schemes through solving a transient two-dimensional heat conduction [b]problem. Through careful programming and many numerical tests, I made new [b]observations concerning the effects of relaxation factors and a phenomenon [b]which I named as “false convergence”. In addition to regular schemes, I [b]also employed the Low-Storage Runge-Kutta schemes proposed by [b]J.H.Williamson, hoping to improve the accuracy of temporal discretization. [b]However, they showed no superiority to other schemes. After carefully [b]analyzing the results, I came to realize that the inherent discontinuity of [b]boundary conditions in this problem limited the accuracy, and a specific [b]scheme has its specific range of application. [b][b]In addition to regular studies, I have been involved in research projects [b]at an early stage of my undergraduate study. These research projects [b]spanned such diverse subjects as energy conversion, heat transfer, and [b]fluid mechanics. [b][b]My early research was mainly related to energy systems. As a sophomore, I [b]assisted Dr. Guoquan Qiu in the construction of a kind of novel solar [b]energy collector, and I experimented with it. This first involvement in [b]research gave me preliminary knowledge about “what engineering really is”. [b][b]Later, in Dr. Hong Ye’s lab, I took part in the design of a heat pump [b]system which had promising applications in food industry to efficiently [b]desiccate vegetables. I did a large portion of the work in design, [b]construction, experimentation, system analysis and improvement. And the [b]final results were very good. [b][b]Later, my interest shifted to biomedical engineering, whose [b]interdisciplinary nature attracted me very much. I joined in Professor [b]Shuxia Cheng’s group, whose research focused on the preservation of cells [b]and tissues, measurements of physical properties of organisms, and other [b]research projects directed at immediate medical applications. I attended [b]the group meetings frequently, and offered my ideas toward many problems. [b]Later, I was assigned the task to calculate the fluid flow and mass [b]transfer in a dialyses system. This was the first project on which I worked [b]independently. It required dealing with two coupling boundary conditions in [b]calculation. I devised a SIMPLE-like method and successfully overcame the [b]difficulties. My work was finally summarized in a technical report and [b]became a part of the Ph.D. thesis of a member in the lab. It should be [b]mentioned that this work was completed when I haven’t finished the courses [b]of Numerical Heat Transfer and Viscous Fluid Mechanics. And now, with [b]added knowledge in these fields, I have renewed interest in biomedical [b]engineering. [b][b]Experiences in Professor Cheng’s group made me well aware of the [b]importance of fluid mechanics in engineering systems, so later I devoted [b]great efforts to that field. Through extensive reading, I have kept abreast [b]with the latest developments in fluid mechanics such as Lattice-Boltzmann [b]Methods, ENO & WENO schemes, high-order compact schemes, etc. Currently, I [b]am attending graduate courses in Advanced Fluid Dynamics and Applied [b]Mathematics, participating in Professor Yiliang Chen’s seminar on PDF [b]methods, and attending an elective on fluid flows in MEMS. I believe a [b]sound understanding of fluid mechanics can greatly benefit the research of [b]other disciplines such as heat transfer. [b][b]My interest in microscale heat transfer came from Professors Bu-Xuan Wang [b]and Xiao-Feng Peng’s work in boiling heat transfer in microchannels. Their [b]description of boiling systems using statistical methods really fascinated [b]me. Professor Chang-Lin Tien’s seminal work in the basic mechanism of [b]microscale heat transfer further motivated me to go into this field. This [b]field is full of exciting opportunities and challenges, and is constantly [b]drawing ideas from physics, materials science, electrical and mechanical [b]engineering. A sound understanding of transport phenomena in micro scales [b]can greatly push forward the progress of heat transfer as well as related [b]engineering applications. [b][b]Therefore, I choose Berkeley, the Mecca of heat transfer researchers in the [b]world, to further my studies and research. With my broad background, solid [b]foundations, and above all, keen interest in this field, I am confident [b]that I can succeed in my graduate studies. [b][b]After obtaining the Ph.D. degree, I will come back to China and continue [b]my research in this area. I believe that coming into this prosperous field [b]will be one of the most significant decisions in my life and a graduate [b]experience in Berkeley will greatly benefit both my own career and my [b]country. [b][b][b]