A NEW ALGORITHM FOR FAST HIDDEN SURFACE REMOVAL OF COMPLEX OBJECTS

ＡＮＥＷＡＬＧＯＲＩＴＨＭＦＯＲＦＡＳＴＨＩＤＤＥＮＳＵＲＦＡＣＥＲＥＭＯＶＡＬＯＦＣＯＭＰＬＥＸＯＢＪＥＣＴＳＦｕＹｕｑｉｎｇ（富煜清）；ＨｕａｎｇＪｉｎｆａ（黄金法）；ＬｉｎＦｅｎｇ（林峰）（ＤｅｐａｒｔｎｉｅｎｔｏｆＲａｄｉｏＥｎｓｉｎｅｅｒｉ...     

揭开神秘的面纱--评《神话与现实-〈一千零一夜〉论》

郅溥浩所著《神话与现实-<一千零一夜>论》是我国第一部以多层次、多视角研究阿拉伯民间文学《一千零一夜》的专著。作者首先追本溯源,解析《一千零一夜》的成书之谜;其次在国际民间故事研究的宏大视野下,考察其故事母题和故事类型的特点;再用微观求证的方法,以文化参与的开阔视点深入挖掘文本的丰富文化内涵并探究其双重价值取向;最后在宏观的视野下考察其世界地位。     

折线型坡面时土压力的近似计算

针对折线形坡面，通过经典库仑土压力理论，对挡土墙的土压力作出近似的计算。     

布儒斯特角显微镜和单分子膜表面形貌研究技术

用布儒斯特角显微镜研究了花生酸分子成膜过程中单分子膜表面形貌的动态变化，发现在气／液界面上花生酸分子首先形成岛状分布，随着表面压的增加形成完整的单分子膜，而当表面压达到崩溃压后薄膜出现裂纹，分子膜重叠，形成多层膜。分析了花生酸单分子膜的形成机理。     

自组装膜的表面反应及自组膜的构筑

界面反应已成为界面自组装构筑的一个重要反应方面.从自组装膜的形成及自组装膜的气相、液相、膜上分子交联反应以及膜表面大分子寡聚体的设计组装等几个方面的表面反应对近年来自组装膜构筑方面的进展予以分析和综述.引用文献23篇.     

西北干旱区地表水与地下水资源转换的几个问题探讨

从山区至平原，地表水与地下水之间在不同地质地貌单元相互转换，是我国西北干旱区山前平原水资源的主要特点，直接影响到水资源开发利用模式的变化。随着和水利用率不断提高，减少了地下水补给来源，引起地下水位下降，泉水量削减，甚至枯竭，迫使泉灌区边城井灌。这在水资源西藏高原、森林资源、持续发展     

Application of response surface methodology in medium optimization for pyruvic acid production of <Emphasis Type="Italic">Torulopsis glabrata</Emphasis> TP19 in batch fermentation

Response surface methodology （RSM） was used to optimize the fermentation medium for enhancing pyruvic acid production by Torulopsis glabrata TP19. In the first step of optimization, with Plackett-Burman design, ammonium sulfate, glucose and nicotinic acid were found to be the important factors affecting pyruvic acid production significantly. In the second step, a 23 full factorial central composite design and RSM were applied to determine the optimal concentration of each significant variable. A second-order polynomial was determined by the multiple regression analysis of the experimental data. The optimum values for the critical components were obtained as follows： ammonium sulfate 0.7498 （10.75 g/L）, glucose 0.9383 （109.38 g/L） and nicotinic acid 0.3633 （7.86 mg/L） with a predicted value of maximum pyruvic acid production of 42.2 g/L. Under the optimal conditions, the practical pyruvic acid production was 42.4 g/L. The determination coefficient （R^2） was 0.9483, which ensures adequate credibility of the model. By scaling up fermentation from flask to jar fermentor, we obtained promising results.     

从焦点角度看古汉语数量结构

数量结构是句中陈述人强调的焦点,无论其位于什么位置。本文从焦点敏感的外在形式和内在语义两方面进行阐述,指出古汉语的数量结构是语义焦点。     

Development of integrated precision vibration-assisted micro-engraving system

A novel precision vibration-assisted micro-engraving system was developed by the integration of fast tool servo and ultrasonic elliptical vibration system, in which the flexure hinge was designed to avoid backlash and PID control algorithm was established to guarantee specific precision. Apart from experimental validation of the performance of the system, various micro-V-grooves cutting experiments on aluminum alloy, ferrous material and hard cutting material were performed, in which Kistler force sensor was used to measure cutting force. Through experiments, it was clear that the vibration-assisted micro-engraving system can ensure good quality of micro-V-grooves and reduce cutting force by about 60% compared with traditional removal process without ultrasonic vibration.     

基于MATLAB的结构可靠度分析方法研究

基于结构可靠度分析方法—JC法、蒙特卡罗法和响应面法的基本原理,利用MATLAB软件对算例编制了相应计算程序,并对计算结果进行了比较.计算结果表明,利用MATLAB可以编制结构可靠度分析程序,计算结果较快,数据合理,并为复杂结构的可靠性分析提供参考.