应用锚杆支护值得重视的一个问题

锚杆支护是煤巷采准巷道支护的发展方向，顶板条件对支护质量影响重大，本文通过对一次顶板事故的分析，定性、定量的探讨这一问题。     

足部反射区按摩治疗41例腰肌劳损临床报告

腰肌劳损是运动训练和比赛中常见的运动性创伤。本文阐述了其产生的原因、症状及其诊断治疗方法。     

篮球运动中的髌骨劳损及处理

阐述篮球运动中髌骨劳损的机制、检查、预防及处理方法,针对髌骨劳损具有患病率高,不易察觉,逐渐积累且又无特别有效治疗方法的持点,提出预防髌骨劳损应以预防为主,合理安排负荷和正确的训练方法,     

发酵液有效磷含量测定方法研究

通过对钼锑抗比色法测定有效磷含量测定值影响因素的对比分析,以便获取快捷准确地评价磷细菌的解磷能力的方法,进行有效地筛选。实验证明反应液最大吸收波长在720 nm左右;发酵体积、加入活性碳与否、反应液的pH值等对测定结果影响不大,这样在筛选时就可以大大提高效率;超声波处理20 min效果明显;在用50 mL容量瓶进行定容时,取样体积以2.5 mL为宜。对发酵液进行离心效果更好些,但在必要的情况下,可以静置后取上清测定。     

Ni51.6Mn23.4Ga25单晶磁场增强的双向形状记忆效应

测量了Ni51.6Mn23.4Ga25单晶的交流磁化率、电阻、有无磁场下的相变应变.结果表明该材料的马氏体相变温度为252K,相变热滞后仅为6K,自发相变应变量高达-1.15%.沿应变测量方向和垂直应变测量方向施加960KA/m的磁场,双向形状记忆的应变量分别增强到-2.35%和0.56%.分析表明该单晶的大自发相变应变量起源于内应力诱导的变体择优取向,而磁增强的相变应变量归功于外加磁场通过孪晶界移动的方式诱导的变体择优取向.     

熔体处理易拉罐用铝材的中间退火组织与性能

探讨了经高效熔体处理的易拉罐用铝材中间退火后的再结晶组织、力学性能及制耳倾向的变化规律。结果表明 :经 430℃保温 1h后空冷 ,铝板材的再结晶晶粒组织细小均匀 ,平面塑性各向异性△γ>0且达到最低值 ,断口中的韧窝无明显的大块夹杂与缩气孔存在 ,断裂方式以穿晶微孔聚集型为主 ,综合力学性能较好。     

Growth of a Void in a Rubber Rectangular Plate under uniaxial Extension

The finite deformation and stress analyses for a rectangular plate with a center void and center void and made of rubber with the Yeoh elastic strain energy function under uniaxial extension were studied in this paper.An approximation solution was botained from the minimum potential energy principle.The num,erical results for the growth of the cavitation and stresses along the edge of the cavitation were discussed.In addition,the stress concentration phenomenon was considered.     

电阻应变片直流电桥测量电路的研究

传感器测量电路通常采用电桥电路，电阻应变片是测量微小应变的常用传感元件。论述电阻应变片直流电桥测量电路的工作原理，介绍可变增益放大器AD8221在应变测量中的应用，并对其提高共模抑制比以及对ESD的防护措施进行阐述。     

Rate-sensitive numerical analysis of dynamic responses of arched blast doors subjected to blast loading

Current practice in analysis and design of blast doors subjected to blast loading considers only simple boundary conditions and material properties. The boundary conditions and material properties, in fact, have considerable influence on the response of blast doors subjected to blast loading. In this paper, the dynamic responses of a reinforced concrete arched blast door under blast loading were analyzed by the finite element program ABAQUS, combined with a previously developed elasto-viscoplastic rate-sensitive material model. And the effect of the surrounding rock mass and contact effect of the doorframe were also taken into account in the simulation. It is demonstrated that the strain-rate effect has considerable influence on the response of reinforced concrete blast door subjected to blast loading and must be taken into account in the analysis.     

应变式电子计价称的弹性体设计

在应变武传感器设计中,弹性体的设计是一个重要环节.通过对悬臂单梁和平行梁形状的弹性体的力学分析,说明经改造后的平行梁弹性体能满足电子计价称的设计要求.