一种三维数值方法及其应用分析

为了提高包含有交界面的三维复杂流动问题的求解精度，将二维坐标系中的Youngs算法公式推广到三维坐标系应用，根据流体体积分数的定义，在二维直角坐标系Youngs算法的基础上，把介质分界面近似为平面，通过引入修正系数，实现了Youngs算法在三维坐标系中的应用，给出计算方法，并编写程序进行算例验证，数值模拟了具有复杂边界的空中爆炸形成冲击波的形成和传播过程，通过数值试验，证明了Youngs算法在三维坐标系中成功的应用．     

CILT2000: Visualization and Modeling

CILT2000 helped VisMod evolve from a collection of local and distinct research and development efforts into a solid field of education. Previous intellectual efforts focused around a) modeling and simulation tools, b) visual explanation tools, c) visual data analysis tools, d) exploring student needs in the context of VisMod, and e) exploring instructional frameworks for VisMod. These focus areas have evolved in two main trajectories, representing the evolution of the field, the generalization trend, which seeks to identify general principles and guidelines for designing learning environments, and the equitable application trend, seeking to use knowledge gained in the field to leverage education in general.     

论高中教师继续教育的实践与创新

高中教师继续教育在整个基础教育事业中处于重要地位,它涉及到基础教育的核心之一教师素质的培养。通过对高中教师继续教育中存在问题的分析,尤其是在今年新课程实施的背景下,如何推进高中教师继续教育,如何构建新型的教育体系进行积极的探索。     

秦巴高寒山区玉米抗灾高产栽培试验研究

在秦巴高寒山区，玉米地膜覆盖栽培可早播避春寒，早熟防秋涝，增产显著，技术经济效益高，产量8080.4kg/hm^2，较拱膜覆盖营养钵育苗移栽增产19．6％，较露地直播增产49．6％，拱膜覆盖营养钵育苗移栽采用坑道地膜育苗，育苗期增温防寒效果好，产量6756.4kg/hm^2，较露地直播提早成熟4.3d，增产25．08％，早熟品种中夏2号生育期较短，产量较丹玉13号提高3．23％，生产上可扩大示范中夏2号玉米新品种。     

口腔仿真模拟系统及其在临床前教学中的应用

介绍口腔仿真模拟系统的主要构成以及功能特点。在口腔临床前教学中应用此系统不但能够增强学生的学习积极性、巩固基础理论知识,而且能够提高临床操作技能,值得进一步在口腔教学中推广应用。     

高职高专人才培养中图书馆评估指标探析

作者在对高职高专人才培养工作水平评估标体系进行分析的基础上,就如何科学、合理地评价一所图书馆提出了一些粗浅的建议和看法,以期抓住各类型评估的良好机遇,推动图书馆事业的发展.     

解读《普通高等学校图书馆规程(修订)》的意义

《普通高等学校图书馆规程(修订)》的意义表现为突出了图书馆信息服务的地位，充实了献资源建设的意义，强调了读服务体系的建立，明确了科学化管理的要求，提高了专业人员素质结构标准，加大了图书馆经费保障力度等六个方面。     

谈中学数学教学中求异思维能力的培养

结合教学实践谈如何培养学生的求异思维品质,提高学生的求异思维能力。     

对跳远两种技术的初步探讨

以世界优秀跳远选手刘易斯和埃米扬的典型两跳为参照,分析了我国优秀跳远运动员在助跑速度、绝对速度、速度利用率、腾起角度与两选手之间的差异,提出了近期内练就刘易斯一样以速度见长的技术特点（低跳跃型）可能性不大的情况下,适度调整垂直速度和水平速度的比例,降低助跑速度利用率,增大腾起角,走埃米扬力量见长（高跳跃型）技术之路,是我国优秀跳远运动员提高成绩的有效途径。     

Numerical investigation of cavitating flow behind the cone of a poppet valve in water hydraulic system

Computational Fluid Dynamics (CFD) simulations of cavitating flow through water hydraulic poppet valves were performed using advanced RNGk-epsilon turbulence model. The flow was turbulent, incompressible and unsteady, for Reynolds numbers greater than 43000. The working fluid was water, and the structure of the valve was simplified as a two dimensional axisymmetric geometrical model. Flow field visualization was numerically achieved. The effects of inlet velocity, outlet pressure, opening size as well as poppet angle on cavitation intensity in the poppet valve were numerically investigated. Experimental flow visualization was conducted to capture cavitation images near the orifice in the poppet valve with 30° poppet angle using high speed video camera. The binary cavitating flow field distribution obtained from digital processing of the original cavitation image showed a good agreement with the numerical result. Project supported by the National Natural Science Foundation of China (No. 59835160) and Scientific Research Foundation for Returned Overseas Chinese Scholars, State Education Ministry of China (No. 50175097)