生态型RPC材料在静态和动态荷载下的力学行为研究

以50%～60%的超细工业废渣取代水泥,用天然黄砂取代磨细石英砂,采用超细工业废渣多元复合技术,制备出生态型活性粉末混凝土(ECO-RPC).研究了不同纤维掺量和不同养护龄期对ECO-RPC静态力学性能的影响.采用霍普金森杆方法研究了高速冲击下应变速率对ECO-RPC动态力学性能的影响.结果表明,随着纤维掺量和养护龄期的增加,ECO-RPC各项静态力学性能不断提高.通过超细粉煤灰(25%)、超细矿粉(25%)和硅灰(10%)三掺制备的ECO-RPC性能最佳,其抗压强度、抗折强度和断裂能分别达到200 MPa,60 MPa 和 30 kJ/m2以上.ECO-RPC具有明显的应变率强化效应,随着应变率的提高,峰值应力及峰值应变显著增长,应力应变曲线所包围的面积不断增大,破坏特征从脆性转变为韧性.     

A new extension algorithm for cubic B-splines based on minimal strain energy

INTRODUCTION B-spline curves and surfaces have been widely used in Computer Graphics (CG) and Computer Aided Design (CAD) (Hoschek and Lasser, 1993; Piegl and Tiller, 1997). Many practical algorithms, such as those for position and derivatives evaluation, knot insertion, knot deletion and degree elevation, are usually implemented in a CAD system that uses B-spline as a shape design tool. In curve and surface design, a given B-spline curve or surface usually needs to be extended in …     

金属动态应变时效现象中的"锯齿屈服"

动态应变时效是在金属和合金中，移动着的溶质原子和运动中的位错发生交互作用时所出现的一种强化现象。它对于常用的工业金属和合金的使用性能的影响是不容忽视的，因而也引起材料学界许多人的关注。章着重介绍了动态应变时效现象中最突出的宏观表现之一——锯齿屈服——的两个主要特征：临界应变量和不同的锯齿波形，并进行了一些分析，以期加深对动态应变时效现象的认识和理解。     

静、动态螺栓变形协调实验测试系统

螺栓变形协调实验是机械类专业的一项重要实验。该文论述了最新研发的测试系统，并成功应用于教学实践，取得了较好的效果。新的测试系统是基于高性能微处理器开发设计的，相对于传统的实验方式，具有功能强大、使用方便、成本低等诸多优点。     

3K形钢管节点静力工作性能的试验研究

分析了节点各杆最不利受力状况试验结果，测试了各杆在最不利荷栽作用下的应力状况，揭示了节点的受力性能，为3K形钢管节点的应用提供准确的试验数据。     

鱼塘水电站溢洪道闸室三维有限元分析

通过建立三维模型，应用ANSYS分析软件，对鱼塘水电站溢洪道闸室进行三维有限元计算，重点分析了预应力锚固端和牛腿部位的应力和应变，为鱼塘水电站溢洪道闸室的设计提供了依据，也为今后的实际工程提供了有意义的参考。     

规范不变性与电荷守恒关系的再讨论

进一步讨论了规范不变性与电荷守恒的关系及一切可观测物理量的规范不变性是电荷守恒定律的体现。     

考虑应力集中效应的散体材料桩复合地基固结解析分析

提出了考虑应力集中效应的散体材料桩复合地基固结数学模型，给出了相应的解析解，并探讨了此类复合地基固结的一般规律，沿用已有理论进行了计算得到的平均固结度较本文理论的计算结果偏小。     

Assessing the links between punitive parenting,peer deviance,social isolation and bullying perpetration and victimization in South Korean adolescents

Children who are abused at home are at an increased risk of bullying perpetration and bullying victimization. Within that context, the purpose of the present study was to test Agnew’s general strain theory and the peer deviancy training hypothesis by utilizing structural equation modeling to empirically examine pathways linking punitive parenting to bullying perpetration and bullying victimization. This study adds to the literature in two important ways. First, potential mediating linkages between punitive parenting and bullying perpetration and bullying victimization were examined, including socially withdrawn behavior and deviant peer affiliation. Second, these relationships were considered in a longitudinal sample of South Korean adolescents, which is a novel examination given that parenting in South Korea is guided largely by Confucianism which reinforces parental control, restrictiveness, and a punitive nature. Results indicate that: (1) punitive parenting is directly related to bullying perpetration but not bullying victimization; (2) punitive parenting was found to have indirect effects only on bullying perpetration; (3) deviant peer affiliation increased the likelihood of bullying perpetration and victimization; and (4) socially withdrawn behavior only affected bullying perpetration via its effect on deviant peer affiliation.     

压力容器电测法应力测量实验探讨

压力容器在石油、化工及其它许多行业都占有重要位置。压力容器实验对保证压力容器安全可靠地运行不仅非常重要,而且非常有实用价值。该论文介绍了当电阻应变法用于压力容器应力测量时具有的一些明显的特点及注意事项和可能遇到的一些技术问题。