有机光导体鼓机理及寿命研究

介绍了有机光导体材料的简单机理，描述作为现代主要光电成像设备的重要部件有机光导体鼓的功能，并对其使用情况与寿命进行了分析，并总结了几条OPC鼓维护和维修的经验。     

应变疲劳对钢材延性断裂韧度JIC的影响

应用应变疲劳能量损耗的理论和弹塑性断裂力学的J积分理论,初步探讨了钢材的应变循环加载对延性断裂韧度JIC的影响。通过对20G钢和16Mn热轧钢板两种钢材的应变循环加载前、后两种状态的延性断裂韧度JIC测试数据的比较,考察了这种影响的存在。测试结果表明,±0.3%全应变控制的循环加载,经历500周次后可使两种钢材的JIC数值产生15%以上的改变量。对于20G钢,这种变化与Rice给出的循环加载变形功与J积分之间的函数关系相对应;而对于16Mn钢则有较大的差异,其原因有待于进一步的研究。     

浅析运动性疲劳

疲劳是一种正常生理现象,运动到一定阶段必然出现的一种生理功能变化现象。本文对运动性疲劳的概念及其分类、产生机制与学说、测定与判断、以及消除等方面做了全面的概述。     

AN IMPROVED CALIBRATION METHOD FORDYNAMIC CHARACTERISTICSOF STRAIN GAUGE

ＡＮＩＭＰＲＯＶＥＤＣＡＬＩＢＲＡＴＩＯＮＭＥＴＨＯＤＦＯＲＤＹＮＡＭＩＣＣＨＡＲＡＣＴＥＲＩＳＴＩＣＳＯＦＳＴＲＡＩＮＧＡＵＧＥＨｅＸｉａｏｙｕａｎ（何小元）ＹａｎｇＨａｎｇｕｏ（杨汉国）ＷｕＪｉｎｇｓｏｎｇ（吴劲松）（ＤｅｐａｒｔｍｅｎｔｏｆＭａ...     

LZ50车轴钢疲劳裂纹扩展试验研究

完成了连铸和模铸LZ50车轴钢疲劳裂纹扩展试验,得到了两类LZ50车轴钢的疲劳裂纹扩展曲线。采用Paris公式和另一种全范围表达式研究了两种铸造工艺下LZ50车轴钢的疲劳裂纹扩展规律。研究结果表明:Paris公式仅能描述LZ50车轴钢疲劳裂纹稳定扩展阶段的规律;全范围表达式对LZ50车轴钢的全范围疲劳裂纹扩展规律描述较好,且得到的疲劳裂纹扩展门槛值与试验曲线得到的门槛值接近,相对误差小于3%;连铸LZ50车轴钢的疲劳裂纹扩展速率门槛值低于模铸LZ50车轴钢,其疲劳裂纹扩展性能不如模铸LZ50车轴钢。     

Review:Advances in research of stress-assisted corrosion fatigue problem

INTRODUCTION People find that when many glasses and ceramic materials are subject to static loading as well as a chemically reactive environment, they often experi-ence delayed failure due most likely to stress-assisted chemical reactions at the cracks: pre-existing surface flaws grow to a critical length, at which point unstable rapid crack propagation ensues, leading to catastro-phic failure. For a given material and ambient envi-ronment, the lesser the applied stress, the longer the ti…     

少儿训练营养特点初探

少儿训练是运动员一生的启蒙阶段，基础建立得是否扎实、牢固，不仅取决于科学训练，而且还取决于训练中的营养供应。实践已经证明，在少儿时期，营养是发育的基础，也是训练的基础，科学的营养是其成材的关键。     

混凝土三轴等幅拉-压疲劳性能试验研究

Fatigue tests were conducted on tapered plain concrete prism specimens under triaxial constant-amplitude tension-compression cyclic loading. The low stress of the cyclic loading was taken as 0.2fc and the upper stress ranged from 0.20ft to 0.65ft. Three constant lateral pressures were 0.1fc, 0.2fc and 0.3fc respectively. Based on the results, the three-stage evolution nile of the fatigue stiffness, maximttm(minimum) longitudinal strain and damage were analyzed, and a unified S-N curve to calculate fatigue strength factors was worked out. The results show that the fatigue strength and fatigue life under triaxial constant-amplitude tension-compression cyclic loading are smaller than those under uniaxial fatigue condition. Moreover, the secondary strain creep rate is related to the fatigue life, a formula for describing their relation was derived. The investigation of this paper can provide information for the fatigue design of concrete structures.     

革兰氏染色方法的改进

在不改变实验结果的前提下,改进革兰氏染色法,将四步操作简化为三步操作.     

Isolation and characteristics of Arthrobacter sp. strain CW-1 for biodegradation of PAEs

Isolation of new bacterial strains and recognition of their metabolic activities are highly desirable for sustainability of natural ecosystems. Biodegradation of dimethyl phthalate (DMP) under anoxic conditions has been shown to occur as a series of sequential steps using strain CW-1 isolated from digested sludge of Sibao Wastewater Treatment Plant in Hangzhou,China. The microbial colony on LB medium was yellowish,3～5 mm in diameter,convex in the center,and embedded in mucous externally. The individual cells of strain CW-1 are irregular rods,measuring (0.6～0.7)×(0.9～1.0) μm,V-shaped,with clubbed ends,Gram positive and without any filaments. 16S rDNA (1438 bp) sequence analysis showed that the strain was related to Arthrobacter sp. CW-1 and can degrade PAEs utilizing nitrate as electron acceptor,but cannot mineralize DMP completely. The degradation pathway was recommended as: dimethyl phthalate (DMP)→monomethyl phthalate (MMP)→phthalic acid (PA). DMP biodeg-radation was a first order reaction with degradation rate constant of 0.3033 d-1 and half-life 2.25 d. The DMP conversion to PA by CW-1 could be described by using sequential kinetic model.