点、线、面在现代城市街道设施设计中的应用

点、线、面是现代城市街道设施最基本的设计元素.点、线、面有各自独立的品质,在街道设施设计中除应承认其几何学的一般意义外,更重要的是在街道环境中给予人们的感情作用和艺术形态对于视觉审美的意义.巧妙地对各类街道设施造型按点、线、面视觉形态分类进行有目的的设计,不仅可以表现出许多不同的情感和视觉效果,而且可以获得交通疏导、人文景观、功能空间区分等多重效益.     

论《画法几何与机械制图》课程教学中的读图方法之一——线面分析法

在《画法几何与机械制图》中读图方法一般有两种:形体分析法和线面分析法,前者一般用以分析以叠加式为主的组合体结构,而在看比较复杂的视图时,尤其是看一些切割式组合体,主要采用线面分析法。用线面分析法分析视图时要根据所学习的平面投影知识和原理,掌握一定的方法和步骤,才能迅速而准确地判断出物体的形状结构。     

复平面上超越方程的数值解法及其应用

基于幅角原理和闭合曲线积分,结合MATLAB,提出了复平面上超越方程的两种数值解法,并编制了相应的程序。这两种方法都能将指定区域内的所有解求出,且无需选定初值。数值结果显示了这两种方法的优越性。     

凸多面体欧拉定理的证明

文章给出凸多面体欧拉定理的四种证法。     

射影平面上二阶曲线渐近线的几种求法

本文介绍一般教课书里不曾介绍的常态二阶曲线渐近线方程的三种求法 :利用两直径共轭求法、利用对合对应求法及利用过中心的切线求法     

一类4——可着色的极大平面图

定义了极大平面图的分离圈和分离带,并讨论了一些简单的平面图的着色问题,又给出了一类４－可着色的极大平面图．     

The hip control test is a valid and reliable measure of hip neuromuscular control

Abstract

Insufficient hip neuromuscular control may contribute to non-contact sport injuries. However, the current evaluative test of hip neuromuscular control, the single-leg squat, requires hip abductor muscle strength to complete. The purpose of this study was to develop the hip control test (HCT) and determine the test’s reliability and construct validity. Nineteen healthy adults visited the laboratory twice. The HCT is a 10-s test of reciprocal toe-tapping accuracy. Both automated and manual HCT ratings were recorded simultaneously during each visit. Additionally, eccentric hip abductor torque was measured. HCT reliability was assessed with intra-class correlation coefficients (ICC). Agreement between automated and manual ratings was determined with Bland–Altman plots. Construct validity was established if HCT performance significantly decreased with a secondary cognitive task (p < 0.05). Bivariate regression determined the relationship between HCT performance and eccentric hip abductor torque. Automated and manual HCT ratings both had moderate reliability (ICC = 0.72) and yielded similar results (limits of agreement = ?1 to 2 taps). The HCT had construct validity (p = 0.001), and no correlation with hip abductor muscle strength (r = 0.213). Thus, the HCT is a reliable and valid test. The HCT is simple to administer and measures hip neuromuscular control separately from strength.     

提高教学软件开发质量与开发进程的策略

针对目前教学软件开发存在的重复性、低效率的现象,从三个角度讨论了提高教学软件开发质量与开发进程的策略。     

论复元素(α βi,γ δi)的KM表示法

本文经过分析论证,给出复元(α βi,γ δi)的KM表示法,据此就可将实平面拓广到复平面,在复平面上就可分别作出所有函数y=f(x)的完整的几何图象,并举例阐述其具体应用。     

在n阶仿射平面中构造多种类型的BIB设计

在n阶仿射平面中,利用点作处理,线与线之间的位置关系作区组,构造出多种类型的BIB设计。