外翅片管加工时飞边的形成机理

建立了挤压犁削加工外翅片管过程中的飞边的生成模型，给出了产生飞边的判定准则，并对影响飞边产生的因素进行了研究，理论分析及实验结果表明，当刀具挤压挤起的金属边脊的体积大于顶刃切出的翅片体积时，会形成飞边而失稳，反之，则挤压犁削过程稳定，无飞边产生。     

高校开设体育教学基础班浅议

本文针对我院教学改革，二年级体育教学进行分项授课，通过实践，教学效果良好，但对“三差”生在教学中也存在一定困难，放建议开设基础班的教学.     

水泥中Mg含量准确测定的探讨

本文就水泥中Mg含量的EDTA满定法测定进行探讨．改进后的方法与原子吸收光谱分析法比较，结果令人满意．     

稀土—对磺胺偶氮溴膦β型显色反应研究

在ClCH2 COOH-CH3 COONa介质中，稀土和对磺胺偶氮溴膦（BPA－pSN)可以形成β型同核及异核络合物，β型同核络合物的组成为RE：BPA－pSN＝1：2，β型异核络合物的组成为RE1（重稀土）：BPA－pSN：RE2（轻稀土）＝1：3：1，对形成β型络合物的可能机理进行了探计：形成β型异核络合物的可能机理是当轻、重稀土同时存在时，重稀土和对磺胺偶氮溴膦形成的β型络合物诱导了轻稀土和对磺胺偶氮溴膦形成的α型络合物向β型络合物的转化。     

自控八方向逐点比较法差补程序设计

采用差值原理，刀架进给由四方向变为八方向，扩大了加工范围；采用微观逼近法解决了曲线加工问题；采用平移原理解决加工切线不过圆心的问题；另外，采用坐标判别法解决曲线加工中的顺时针、逆时针加工问题．     

Photoluminescence from Ge-SiO2 thin films and its mechanism

Ge-SiO₂ thin films were deposited on p-type Si substrates using the radio frequency (rf) magnetron sputtering technique with a Ge-SiO₂ composite target. Films were annealed in N₂ ambience for 30 min at 300℃—1000℃ with an interval of 100℃. Through the X-ray diffraction, the average size of Ge nanocrystals (nc-Ge) was determined. They increased from 3.9 to 6.1 nm with increasing annealing temperature in the range of 600℃—1000℃. Under ultraviolet excitation, all samples emit a strong violet band centered at 396 nm. With the formation of nc-Ge, the samples exhibit another emission of orange band with the peak at 580 nm and its intensity increases with the increasing size of nc-Ge. The peak positions of two bands do not shift obviously. Experimental data indicate that the violet band comes from GeO defect and the orange band originates mainly from the luminescence centers at the interface between the nc-Ge and SiO₂ matrix.     

Evaluation of genetic diversity and relationships within and between two breeds of duck based on microsatellite markers

The genetic diversity of two natural populations (M, N) of Beijing duck (Anas platyrhynchos) and 11 artificially selected lines of Beijing duck (A, B, E-L, O) from China Gold Star Duck Production Ltd., along with two Cherry Valley duck lines (C and D) from the British Cherry Valley Livestock Division, was evaluated using 18 microsatellite markers covering 16 linkage groups. A phylogenetic tree of the 15 populations of duck, formed of four main branches, was constructed from Nei’s D_A genetic distance. The mean genetic differentiation index (F_ST) in all loci, Nei’s standard genetic distance (Ds), and the genetic distance D_A between the Beijing duck and the Cherry Valley duck were 0.075, 0.143 and 0.142, respectively. These results demonstrated a high degree of genetic similarity between the two breeds and supported the hypothesis that the Cherry Valley duck was derived from the Beijing duck. The F_ST matrix of seven clusters of Beijing duck suggested that the efficiency of selection was not significant to some extent and should be supplemented by marker-assisted selection.     

111名高校田径运动员两年来的运动损伤分析

对韶关学院及其他院校参加广东省第七届大学生运动会田径代表队111名运动员近两年来在训练和比赛过程中受伤的情况进行统计分析与研究.发现运动损伤情况比较普遍,70.3%的运动员在这两年内的训练过程中有不同程度的运动损伤发生,受伤人数是78人,累计受伤例次更是高达195例,人均受伤次数为1.76次,跳类和十项全能受伤比例最高,损伤率达到100%.总体上各部位受损率最高的是腰,其次为肩、腕、肘、膝、踝、脚背等部位.技术动作不规范是大学生田径训练创伤的主要原因,其次是过度疲劳、运动量过大.通过分析大学生田径训练运动损伤原因,提出了预防措施.     

简论哲学现代化

马克思主义哲学现代化问题是近年来哲学界普遍关心的问题，但始终未能达成共识。本文认为，哲学现代化的实质是哲学的时代化。其具体内容应当包括：对象现代化、体系现代化、内容现代化、功能现代化、哲学应用化、哲学通俗化     

设备租赁中的期权与租金计算模型

利用布莱克—斯科尔斯期权定价模型 ,对后付等额年金的计算模型进行了修正 ,使租金计算具有较强的实用性和科学性 ,对三峡工程设备租赁具有一定的参考价值