关于平面斜劈运动问题的研究

平面斜劈运动是典型的动力学问题,解决这类问题,应利用运动和相对运动等规律,进行受力分析和运动分析,建立牛顿运动定律方程求解,并进行必要的讨论。     

手臂摆动在跳高起跳中的生物力学意义

用模型研究法对跳高起跳中的手臂摆动进行了研究．分析了起跳前手臂和身体其余部分的受力情况．探讨了起跳时加速力的产生过程,比较了手臂不同的加速摆动方式对身体重心最后速度的影响。由此指出,手臂摆动对身体起跳加速力的贡献率很大,并且,手臂加速摆动的距离越长,身体重心速度的增加越明显。     

平面几何命题组合浅谈

平面几何命题组合应用在教学中可以方便记忆,锻炼和提高解题速度和能力,文中通过“九义”《几何》教材中三个例题说明命题组合的方法。     

确定航片同名核线的新方法

如何在倾斜的航空影像上确定同名核线是数字摄影测量研究的重要问题。本文受“铅垂线轨迹法(VLL)”启发提出了“斜线轨迹法（SLL）”;在“斜线轨迹法”和核点坐标的特殊几何关系的基础上,提出了基于SLL确定同名核线和基于核点坐标确定同名核线的新方法,阐明了两种方法的原理、具体步骤,两种方法都提供了新的思路来确定同名核线,具有原理简单、几何关系明晰的特点。     

毫米波焦平面成像系统

主动式毫米波焦平面成像系统,是近几年来在东南大学毫米波国家重点实验室对毫米波焦平面成像理论和成像关键技术深入研究的基础上,开发的一套自动成像实验系统,由PC机自动完成接收天线阵列的焦平面扫描、各像点单频94GHz毫米波数据采集、自动成像以及图像优化处理的功能。     

平面应力状态分析中的两个问题刍议

给出了在不求主应力的情况下判定二向应力状态的简易公式以及用主应力表示的关于主平面方向角的方程式.     

亚像素级激光光条提取及其激光平面标定应用(英文)

为了标定激光平面以实现三维形貌测量,提出一种亚像素级精度激光光条提取算法.该算法包括两侧边检测和中心线提取2个部分.首先,利用基于主成分角的渐进概率霍夫变换检测2条侧边并依赖该两侧边的距离获取光条宽度;然后,应用二维泰勒展式提取具有亚像素级精度的光条中心线并依据重建的三维坐标标定激光平面.实验结果表明,所提算法光条中心提取速度较快,平均约为78 ms/帧,光条平面共面误差较低,限制在0.3 mm以内.因而所提算法能够满足提取光条的两侧边和中心线的需要,且快速可靠、精度高和抗干扰能力强.     

Application of compactness detection to complicated concrete-filled steel tube by ultrasonic method

An example of using ultrasonic method to detect the compactness of complicated concrete-filled steel tube in certain high-rise building was discussed in this study. Because of the particularity of the complicated concrete-filled steel tubular column, the plane detection method and embedded sounding pipe method were adopted in the process of effectively detecting the column. According to the results of the plane detection method and embedded sounding pipe method, the cementing status of steel tube and concrete can be concluded, which cannot be judged by the hammering method in the rectangular steel tube-reinforced concrete.     

基于 BSP 树的三维场景渲染方法研究

BSP树在计算机图形学中应用于视点运动三维场景显示的计算。一般BSP树以递归的方式对平面进行分割,但实际应用的三维场景复杂度较高,也就使得树的复杂度非常高,预处理时间长。文章针对三维场景模型渲染速度慢的问题,基于空间BSP树的理论基础,通过引入包围体的方法使场景中的物体能够快速实现空间二分树划分,进而提高渲染速度。通过实验比较直接渲染和包围体渲染的速度,验证了引入包围体能够缩小预处理时间,提高场景的渲染速度。     

What’s Wrong with a Little Swinging? Indian Clubs as a Tool of Suppression and Rebellion in Post-Rebellion India

Though the practice of swinging weighted clubs for gymnastic exercise has a centuries long history in India, the latter half of the nineteenth century witnessed the exercise practice grow in political significance. In the years following the 1857 Indian Rebellion, both Hindu nationalists and British army officials undertook the practice with differing intent. Within the martial context, a differentiated style of British club swinging was used to reform supposedly weak and effeminate Hindus, a practice the Hindu physical culture movement sought to render useless through the promotion of heavy club swinging. In first examining the clubs’ origins and British appropriation, the paper explores how two club swinging traditions existed in India in post-1857. Following this, the paper demonstrates how the British army sought to control Hindu bodies through club swinging and how the Hindu physical culture movement concurrently sought to rebuild Hindu bodies capable of defeating British athletes through heavy club swinging. Regarding the latter, focus is given to the wrestling tours of Buttan Singh and Ghulam Muhammad in early twentieth-century Britain. Such tours were used to prove Hindu manliness as constructed through the club exercise.