Differential Capillary Effect Model of Fabric and Its Application

The concept of the differential capillary effect was presented by foreign scholars several years ago, and the principle was used to design sportswear fabrics with good wet permeability and good drying functions for famous sports teams. Because the differential capillary effect model was not established in theory, it was impossible to fulfill the best functions. In this paper, by setting up the differential capillary effect of fabric, the factors to influence wet permeability and drying functions of the model is discussed in theory, and the means to optimize the design of the fabric is presented and proven practically by the experiment. The optimum fabric with good permeability and good drying functions can be designed using the model at last.     

具有抗噪性能的运动检测的硬件实现

设计了用硬件实现的两种检测算法的原理框图．可实时对２５６×２５６的图像进行运动目标检测处理．用硬件实现了噪声的实时检测与计算，为门限值的确定提供了依据．按照所提出的算法建立的实时系统具有较强的抗噪能力和一定的自适应能力，它具有简单、实时的特点．其结构可以扩展到处理５１２×５１２的图像，适合于ＶＬＳＩ的实施．     

含有一个重粒子的三体系统的内部运动模式

本文选择含有一稍重粒子的三体系统,对其诸O~ 束缚态的结构和内部运动进行了研究。与以往对三全同玻色子体系和含一轻粒子的三体系统的研究比较,没有发现新的内部运动模式,但重粒子的质量效应却很明显。     

中世纪自然哲学关于运动本性的争论

以中世纪关于运动本性的争论为主要线索,介绍了亚里士多德的范畴学说和关于运动本体论地位的看法,阿维洛伊关于运动的两种区分,大阿尔伯特用"流动的形式"和"形式的流动"这两个术语对问题的重新表述,奥卡姆的极端唯名论看法,以及布里丹对奥卡姆观点的反驳。此外还讨论了理解运动本性的意义。     

关于二维布朗运动在锥形区域的占有时

考虑标准二维布朗运动在正象限锥形区域的占有时,得到其一阶矩和二阶矩的表达式.并指出这种形式的占有时不可能服从广义反正弦律.     

采用光流场运动估计的双树复小波域视频水印算法

提出一种基于光流场的双树复小波变换(DT-CWT)的数字水印算法.首先利用光流信息检测出视频序列的关键帧,然后利用光流场技术对选取的关键帧进行局部区域的运动估计.最后,根据人眼对快速流动物体敏感性弱的特点,将水印信号分块嵌入关键帧内快速运动区域.测试结果表明:该算法具有很好的不可见特性,在面对噪声、缩放等恶意攻击时也具有很好的稳定性,同时也具有很好的实时性.     

虚拟投篮系统中的篮球运动仿真

提出了一套虚拟投篮系统设计架构,建立一个虚拟现实场景,其中包括球场、运动员和篮球,并为篮球添加运动和弹性形变两种物理模型. 文中设计的系统模拟了篮球从出手后到落地静止的整个运动过程,描述了篮球出手后在空中的飞行轨迹以及篮球与篮板、地板碰撞时发生的弹性形变. 实验结果表明,文中所采用的算法模拟投篮过程,效果逼真,能满足系统实时性的要求,在具体应用中可以提高运动员的训练效率.     

Elucidation of the relationship between enzyme activity and internal motion using a lysozyme stabilized by cavity-filling mutations

We investigated the activity and the internal motions of a stabilized mutant hen lysozyme (HEL) in which the residues M12 and L56 were mutated to L and F, respectively (LF mutant HEL). The result of the activity measurements against glycol chitin at various temperatures suggested that the temperature dependence of the activity of LF mutant HEL shifted to the high-temperature side compared with that of wild-type HEL. The detailed internal motions of LF mutant HEL in the absence and presence of a substrate analogue, (NAG)₃, were examined by model-free analysis at 35°C. The results showed that the internal motions of LF mutant HEL in the presence of (NAG)₃ were drastically restricted compared with those in wild-type HEL. Our findings thus suggested that the mutation to the stabilized lysozyme restricted internal motions required for the enzymatic reaction.Received 8 February 2005; accepted 10 March 2005Y. Yoshida and T. Ohkuri contributed equally to this work.     

质点直线运动与刚体定轴转动的对比学习

大学物理中的刚体定轴转动知识相对较难,通过对比质点直线运动与刚体定轴转动的定义概念、公式形式和规律性质,以及分析和解决问题的方法步骤等方面,为更有效地降低学生学习难度,提高学生对知识的掌握度,提供有力的帮助.