人体上下肢长预测方法的研究与应用

人体生长发育过程中，具有非等比性和向心律的特点，在生长发育结束以前测评出的形态比例关系，不能直接说明成熟后的情况。通过对7～18岁儿童少年发育状况的调研，提出了人体上下肢长与身高比例关系的预测方法。     

含裂纹细长压杆临界力分析

研究含裂纹的矩形截面压杆的屈曲问题.通过一计及裂纹对压杆局部柔度的影响的无质量扭簧模拟裂纹所在截面,建立与含裂纹细长压杆等效的力学模型;基于完整压杆挠曲线微分方程的基本解,推导出含裂纹压杆的传递矩阵;以两端铰支和一端固定、一端自由的含裂纹压杆为例,结合其具体的边界条件,导出相应的特征方程.该方法能够简便地计算含裂纹细长压杆的临界压力.     

单向S-粗模糊集

结合模糊集理论和单向S-粗集理论,基于动态系统提出了单向S-粗模糊集的概念、结构及其性质,对此进行了讨论并给出应用实例。     

Assessment of three-dimensional joint kinematics of the upper limb during simulated swimming using wearable inertial-magnetic measurement units

The analysis of the joint kinematics during swimming plays a fundamental role both in sports conditioning and in clinical contexts. Contrary to the traditional video analysis, wearable inertial-magnetic measurements units (IMMUs) allow to analyse both the underwater and aerial phases of the swimming stroke over the whole length of the swimming pool. Furthermore, the rapid calibration and short data processing required by IMMUs provide coaches and athletes with an immediate feedback on swimming kinematics during training. This study aimed to develop a protocol to assess the three-dimensional kinematics of the upper limbs during swimming using IMMUs. Kinematics were evaluated during simulated dry-land swimming trials performed in the laboratory by eight swimmers. A stereo-photogrammetric system was used as the gold standard. The results showed high coefficient of multiple correlation (CMC) values, with median (first–third quartile) of 0.97 (0.93–0.95) and 0.99 (0.97–0.99) for simulated front-crawl and breaststroke, respectively. Furthermore, the joint angles were estimated with an accuracy increasing from distal to proximal joints, with wrist indices showing median CMC values always higher than 0.90. The present findings represent an important step towards the practical use of technology based on IMMUs for the kinematic analysis of swimming in applied contexts.     

"螺旋法"制做大规格榫槽型法兰石棉垫及应用

给出了“螺旋法”制做大规格榫槽型法兰石棉垫片的方法，以及该垫片在榫槽型法兰密封面上的安装办法，从而解决了生产中存在的问题。     

单调有界数列一定收敛的新证法

单调有界数列一定有极限 ,采用对区间进行平分再平分 (用二进制表示 )的方法巧妙地给出了有效的证明。用这种方法也可以来证明其它的几个基本定理。     

单层球面网壳屋盖屈曲有限元分析

以单层球面网壳屋盖为研究对象,对50m、30m跨单层球面网壳进行了屈曲有限元分析研究,考虑了不同支座、跨度对结构屈曲特征值的影响,得到了一些重要结论,为单层球面网壳的设计、研究和应用提供了一定的参考和借鉴.     

唐代上层社会妇女婚姻地位探析

唐代上层社会妇女的婚姻生活仍然局限在择偶不自主、生育无节制的传统樊篱内,且忍受着一夫一妻多妾制给女性心灵带来的深刻痛苦,并未如人们想象的那样开放、自由,而且由于从一而终的封建伦理道德对心灵的禁锢,虽然政府对离婚和再嫁有了宽松规定,也并未有多少人身体力行。     

关于粘性导数的几个性质的探讨

M .G .Crandall等人在文 [1]中给出了函数的粘性导数的概念。在这个概念的基础上我们讨论了函数的粘性导数的上 (下 )导集的几个性质 :在函数可微点处的性质、闭凸性质、与C1类函数的和的性质、与C2 类函数的差在严格局部极大 (小 )值点的性质。     

几个重要积分不等式

从简单的代数不等式ab~≤a+b/2出发,通过变形,观察,猜想,用极限思想得出并证明了一些新的积分不等式。