A study of airfoil parameterization,modeling, and optimization based on the computational fluid dynamics method

An excellent airfoil with a high lift-to-drag ratio may decrease oil consumption and enhance the voyage. Based on NACA 0012, an improved airfoil is explored in this paper. The class/shape function transformation has been proved to be a good method for airfoil parameterization, and in this paper it is modified to improve imitation accuracy. The computational fluid dynamics method is applied to obtain numerically the aerodynamic parameters of the parameterized airfoil, and the result is proved credible by comparison with available experimental data in the open literature. A polynomial-based response surface model and the uniform Latin hypercube sampling method are employed to decrease computational cost. Finally, the nonlinear programming by quadratic Lagrangian method is utilized to modify the multi-island genetic algorithm, which has an improved optimization effect than the method used on its own. The obtained result shows that the modified class/shape function transformation method produces a better imitation of an airfoil in the nose and tail regions than the original method, and that it will satisfy the tolerance zone of the model in a wind tunnel. The response surface model based on the uniform Latin hypercube sampling method gives an accurate prediction of the lift-to-drag ratio with changes in the design variables. The numerical result of the flow around the airfoil shows reasonable agreement with the experimental data graphically and quantitatively. Ultimately, an airfoil with better capacity than the original one is acquired using the multi-island genetic algorithm based nonlinear programming by quadratic Lagrangian optimization method. The pressure contours and lift-to-drag ratio along with the attack angle have been compared with those of the original airfoil, and the results demonstrate the strength of the optimized airfoil. The process for exploring an improved airfoil through parameterization to optimization is worth referencing in future work.     

注重实效,全面推进现代教育技术应用

该文概述了电子科技大学教育信息化与教育现代化所开展的工作和已经取得的成绩,同时也讨论了传统教育手段与现代教育手段相互关系和互补,以及今后的发展方向等问题。     

旅游对民族旅游地文化影响探析

跨学科研究是旅游研究中一种重要的手段,文章从社会学、传播学和旅游学三角度出发,主要就跨民族文化传播、文化冲突和文化控制三方面,分析了民族旅游目的地因旅游产生的正、负影响,进而提出了加强法制建设、加强教育、加强舆论导向和发挥群体作用等具体措施,以图促进民族旅游的健康发展和民族旅游目的地文化的进步.     

西方教育选择理论述评

文章根据研究者对个人教育选择范围的不同认识,将西方教育选择研究分为三个派别:教育公共选择学派、教育市场选择学派和主张教育市场化、私营化的激进学派。同时分别介绍了他们在教育选择问题上的核心主张。在此基础上,对西方教育选择理论的现状进行了评析,认为已有的研究为我们提供丰富理论资源的同时,也存在缺陷。一方面对于个人教育选择的价值缺乏全面认识,另一方面对教育选择的制度设计拘泥于政府或者市场的思路。     

Chinese middle school teachers’ preferences regarding performance evaluation measures

Teacher performance evaluation currently is receiving unprecedented attention from policy makers, scholars, and practitioners worldwide. This study is one of the few studies of teacher perceptions regarding teacher performance measures that focus on China. We employed a quantitative dominant mixed research design to investigate Chinese teachers’ preferences for teacher performance measures and the possible reasons for their preferences. Considering the quantitative results, the surveyed Chinese teachers identified fulfillment of additional roles, collaboration with faculty and staff, and students’ test scores as the most important measures for performance evaluation. Qualitatively, the most important measures that the surveyed teachers reported were the teacher’s morality, workload, and students’ test scores.     

在《综合英语》课教学中培养学生的思维能力

陈述培养思维能力的意义，分析目前我国外语教学思维能力培养存在问题的原因，讨论思维能力的内涵及其和英语教学的关系，结合《综合英语》课教学提出了训练思维能力的9种方法。     

建立和完善农村卫生医疗保障体系——对福建省部分农村的调查分析

农村卫生医疗事业属为农村社会生产和人民生活创造共同条件的社会性基础结构的一部分.本文以福建省农村卫生医疗保障体系的建设现状为基础,通过对部分农村及相关部门、机构的调查取证,分析了福建省农村卫生医疗保障体系建设中存在问题,并就健全和完善福建省农村卫生医疗保障体系进行了粗浅的探索.     

Coordination pattern of baseball pitching among young pitchers of various ages and velocity levels

This study compared the whole-body movement coordination of pitching among 72 baseball players of various ages and velocity levels. Participants were classified as senior, junior, and little according to their age, with each group comprising 24 players. The velocity levels of the high-velocity (the top eight) and low-velocity (the lowest eight) groups were classified according to their pitching velocity. During pitching, the coordinates of 15 markers attached to the major joints of the whole-body movement system were collected for analysis. Sixteen kinematic parameters were calculated to compare the groups and velocity levels. Principal component analysis (PCA) was conducted to quantify the coordination pattern of pitching movement. The results were as follows: (1) five position and two velocity parameters significantly differed among the age groups, and two position and one velocity parameters significantly differed between the high- and low-velocity groups. (2) The coordination patterns of pitching movement could be described using three components, of which the eigenvalues and contents varied according to age and velocity level. In conclusion, the senior and junior players showed greater elbow angular velocity, whereas the little players exhibited a wider shoulder angle only at the beginning of pitching. The players with high velocity exhibited higher trunk and shoulder rotation velocity. The variations among groups found using PCA and kinematics parameter analyses were consistent.     

The Development of Social Media and its Impact on the Intercultural Exchange of the Olympic Movement, 2004–2012

Abstract

The development of social media, in the form of Internet and mobile platforms, has rapidly flourished in the early twenty-first century. The changes in broadcasting forms of the first three Olympic Games of the twenty-first century, Athens 2004, Beijing 2008 and London 2012, have corresponded and reflected the speedy expansion of this social media. This phenomenon invites not only attention to the historical transformation of the roles of media for the Olympic Games but also reflection on the concept of culture and intercultural exchange based on this phenomenon. This paper studies the relationships between social media, cultural exchange and the Olympic Games in the context of globalization. It argues that the characteristics of social media as ‘participation; openness; conversation; communities; connectedness’ will meet up with the goal of the Olympic Movement and aid the realization of the Olympic Ideal.     

道德教育榜样观的反思与重构

“]榜样的力量是无穷的”。然而德育中榜样教育的现实却表明,榜样教育的作用毕竟有限,在很多时候甚至会起负作用,其原因就在于传统德育的典型化榜样观有其致命的缺陷。因此,有必要对传统德育榜样观进行批判和反思,并建构与回归生活世界的德育相应的新榜样观。