A new selection criterion for APA papers?

Comments on an incident which appears to involve the application of criteria other than scientific merit to a research contribution. The author includes a letter explaining why his paper with Porter, Conrad, and Mason, "Chronic avoidance behavior, gastrointestinal pathology, and death in the Rhesus monkey," was rejected from inclusion at the opening meeting of an APA convention. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

MODE II STABLE CRACK GROWTH

Abstract Mode II stable crack extension has been examined for an aircraft grade aluminium alloy D16AT. Both theoretical and experimental results are presented. The experimental observations include load displacement diagrams, plastic wake, crack front tunnelling and scanning electron micrographs of the fracture surfaces. The crack shows a tendency for in-plane extension, and the fracture surface is very flat, smooth and free of any dimples. The crack front advances with neghgible tunnelling at all stages of extension. The span of mode II stable crack growth (SCG) is longer than in the case of mode I SCG reported earlier for the same material and there is also more extensive plastic deformation. In the presence of a slight mode I load, the crack grows out-of-plane and the fractured surface facets resemble that of a mode I or mixed-mode dimpled fracture. The theoretical study is based on a finite element analysis using small deformation theory and incremental plasticity. Some of the experimental results have been theoretically predicted using the COA criterion as the governing criterion. The theoretical results include load-displacement diagrams, crack edge displacement curves, plastic zones and the J resistance curves. There is good agreement between the load-displacement diagrams. The initiation and maximum loads differ by less than 15%. The J resistance curve has a constant slope over the whole span of stable crack growth.     

Geomechanical characterisation of cataclastic rocks: experience from the Cleuson–Dixence project

The mechanical behaviour of cataclastic rocks is hard to characterise because of many difficulties arising in getting undisturbed samples during field investigations, in specimen preparation, and in performing appropriate laboratory testing. To acquire a better understanding of such kind of very poor rocks, the EPFL's Rock Mechanics Laboratory has carried out an extensive laboratory testing programme on cataclastic rocks from the Cleuson–Dixence project (Switzerland). After some reflections on the quantification of the intensity of tectonic degradation process by means of the Geological Strength Index, the paper describes briefly the sampling and testing techniques. Then it focuses on the failure criterion and the stress–strain relationship of two types of cataclastic rocks: quartzitic sandstones and phyllitic schists. A new failure criterion is suggested: it consists in an extension of the Hoek and Brown failure criterion that takes into account the progressive damage undergone by cataclastic rocks during the tectonic degradation process. Its parameters are bounded by an upper limit corresponding to the original rock and a lower limit corresponding to a soil-like extremely tectonised material. Finally, the stress–strain behaviour of the tested cataclastic rocks is found to depend on the confining stress and the tectonisation degree and is adequately approached by the hyperbolic law of Duncan and Chang.     

双面研磨抛光中工件表面“塌边现象”的研究

随着信息产业的迅速发展,对半导体器件、光学器件等的表面平整度提出了越来越高的要求。双面研磨/抛光技术是能使工件得到较高形状精度和表面精度的超精密加工主要方法。但是在双面研磨抛光加工中工件存在"塌边现象",这导致工件的表面平整度变差。本文对双面研磨抛光中工件"塌边"这一问题进行研究,分析造成工件表面"塌边"的各种因素,以及相应解决方法,对进一步提高双面研磨抛光加工质量具有重大意义。     

一种新型小电流接地系统单相接地故障检测装置的设计

本文针对小电流接地系统存在的选线问题,在深入分析小电流接地系统发生单相接地故障时的暂态和稳态过程电气量特征的基础上,设计了一套基于综合判据的小电流接地选线装置。利用DSP芯片的优越的数字信号处理功能和快速的运算速度,很好的解决了传统的MCU的运算速度低的问题,实现了包括注入信号法在内的小电流接地综合智能选线算法。其软件判据为综合暂态和稳态判据的综合判据,提高了选线速度和性能。实践结果表明,该装置运算速度快,抗干扰能力强,运行稳定,具有良好的性价比,是小电流接地电网中一种实用的选线平台。     

崩塌落石对不同埋深输气管道的冲击影响

管道埋深是管道设计时需考虑的重要因素之一,不同地域有不同的要求,在崩塌落石地区,由于落石对管道的冲击作用,管道容易发生破坏。文章利用ANSYS／LS—DYNA有限元软件,通过对参数的合理设置,选取适当的材料模型,对埋地输气管道不同埋深时落石对它的动力响应进行了三维数值模拟,得出管道在不同埋深下的响应规律,其计算结果为地质灾害多发地段埋地输气管道的设计施工提供了参考依据。     

对处理管道中低合金钢材质错用事件的思考

在某大型石油化工工程项目施工中,对进场的一批中低合金钢管道组成件进行了材质核查,按施工质量验收规范要求仅实施5％的核查比例,就发现部分合金钢材质错用为碳钢,为了保证工程质量,最后不得不实施100％的在线合金成分复查。笔者认为对合金钢管道组成件的核查比例应当与对合金钢管的一致（即100％）,才能确保管道工程的整体安全性。建议在以后修订验收规范时能给出更加合理的规定。     

海洋结构检测时间间隔确定准则

海洋工程结构检测时间间隔是结构检测维修规划和动态可靠性控制的重要参数。给出了等检测时间间隔准则、确定性裂纹扩展检测准则、等可靠度准则、等风险准则、最低成本准则5种确定检测时间间隔准则,并对5种准则进行了比较分析。该分析有较强的实用性,可供工程设计人员在进行海洋工程结构检测维修规划和动态可靠性控制时参考。     

一种新的关于两电子纠缠的判据

在海森堡绘景下研究外磁场作用下自旋为1/2的耦合二粒子系统纠缠态问题.用数字方法求解该系统极化矢量随时间变化的微分方程组,得到极化矢量随时间的变化规律.计算结果表明,在合适的外磁场条件下,耦合二粒子可以由自旋平行、总的极化矢量z分量为-2的非纠缠态变为纠缠态;得到由非纠缠态变为纠缠态的最佳外磁场条件;提出根据电子的极化矢量随时间的变化来判断耦合二粒子系统是否达到纠缠态的新方法.本方法不需要采用绝热近似,也适用于更复杂的情况,如存在弛豫的体系.