节点半刚性钢桁架受压腹杆计算长度分析

现行设计规范对桁架腹杆计算长度的规定未考虑节点的非刚性效应,但在某些情况下该效应不能被忽略。在经典的刚架弹性稳定理论基础上推导了考虑节点刚度的四弯矩方程和构件群稳定方程,并将其应用于桁架结构。结果表明影响半刚性钢桁架腹杆计算长度的主要因素是腹杆与弦杆线刚度比和腹杆线刚度与节点局部刚度比。通过编制计算程序求取的计算长度数值解,制成了可供设计使用的计算用表和简化计算公式。以等节间Warren型钢管桁架为例证明了在腹杆计算长度分析中考虑节点刚度的意义。     

Family routines and rituals--The importance of family functioning: Comment on the special section.

This diverse collection of papers highlights routines and rituals in family life. Just as individual family members bring unique styles and perspectives to the family table, to be incorporated into a family framework, so do each of these papers present rich and varied research questions, designs, and measurement strategies that enrich our understanding of family routine behavior patterns and ritual meanings. This series adds to our conceptualization of family routines and rituals within a systems perspective highlighting: 1) families are comprised of multiple levels that operate individually; interact with each other; and as a whole, reveal properties distinct from separate parts; 2) families tend toward stability in meaningful patterns of functioning; and 3) family functioning has meaning for individual outcomes. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Randomized trial of a gatekeeper program for suicide prevention: 1-year impact on secondary school staff.

Gatekeeper-training programs, designed to increase identification and referral of suicidal individuals, are widespread but largely untested. A group-based randomized trial with 32 schools examined impact of Question, Persuade, Refer (QPR) training on a stratified random sample of 249 staff with 1-year average follow-up. To test QPR impact, the authors introduced and contrasted 2 models of gatekeeper-training effects in a population: gatekeeper surveillance and gatekeeper communication. Intent-to-treat analyses showed that training increased self-reported knowledge (effect size [ES] = 0.41), appraisals of efficacy (ES = 1.22), and service access (ES = 1.07). Training effects varied dramatically. Appraisals increased most for staff with lowest baseline appraisals, and suicide identification behaviors increased most for staff already communicating with students about suicide and distress. Consistent with the communication model, increased knowledge and appraisals were not sufficient to increase suicide identification behaviors. Also consistent with the communication model were results from 2,059 8th and 10th graders surveyed showing that fewer students with prior suicide attempts endorsed talking to adults about distress. Skill training for staff serving as natural gatekeepers plus interventions that modify students' help-seeking behaviors are recommended to supplement universal gatekeeper training. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Welcoming them home: Supporting service members and their families in navigating the tasks of reintegration.

To date, more than 1.3 million service members have served in the Global War on Terrorism. These men and women and their families face a range of stressful situations and must navigate many important tasks after a deployment. This article outlines four of the tasks of reintegration: redefining roles, expectations, and division of labor; managing strong emotions; abandoning emotional constriction and creating intimacy in relationships; and creating shared meaning. For each task, potential challenges are discussed and suggestions for how psychologists can support families are described. In addition, potential red flags and indicators that more intensive services may be warranted are reviewed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

升温下钢构件的强度设计标准

通过与非线性有限元模拟比较,对结构钢构件在升温下的设计公式进行了评估。比较美国钢协与欧洲标准委员会对温度在800℃侧向无支撑的Ⅰ型柱、梁、柱-梁的设计规定。欧洲规范3的规定与有限元模拟的结果相差10%～20%。另一方面,美国钢协的规范预测的强度与模拟结果相差高达2倍。对于温度超过300℃的中细构件,相差最大。提出了对美国钢协规范计算公式的修正建议,修正后的精度与模拟的结果误差在20%～30%。最后讨论了结构防火工程基于构件评估的局限性、未来的研究以及发展方向。     

对共产党员个人欲望与行为的自我约束的思考

根据孔子对古之君子如何规范、约束自身的欲望、行为提出的准则,以及老一辈革命家的相关论述,论证在新的历史时期,共产党员应不断加强自身修养、严格要求、有效约束个人的欲望与行为,从而成为一个高尚的、有利于社会、有利于人民的人.     

G550高强钢构件的受压稳定

应力等级为G550(屈服强度和抗拉强度都是550MPa)的钢材是一种典型的厚度不到1mm的高强冷轧钢板,许多年来这种钢材一直被用作护墙板或盖板,但是现在被用作结构构件,例如屋面桁架和钢框架房屋中的墙架。这种钢材应变硬化低,抗拉强度和屈服应力的比值是1.0。本文概述了悉尼大学有关这种钢材稳定的一个主要研究项目。进行了短柱和长柱受压构件的试验并和设计规范以及有限元分析进行了对比。     

钢筋混凝土构件正截面内力改进的条带法计算

在钢筋混凝土构件非线性分析，以及不规则形状截面和任意加载方向的梁柱正截面承载力计算中，由截面曲率、中和轴位置求解正截面内力，一般采用网格法和条带法。对这两种方法进行了分析，提出了改进的条带法，将二重积分化为定积分，使之能够使用各种成熟的定积分数值求积公式计算，从而在保证一定的计算精度的前提下提高了计算效率。     

Contaminative Behavior of Plutonium Chloride on Protein Film

This paper deals with the contaminative behavior of plutonium chloride on a protein film, which was studied in order to contribute to the knowledge of actual skin contamination. The experiments were carried out by changing such factors as soiling time, radioactive concentration, the concentration of coexisting electrolyte, acidity of the soiling solution and washing time.

It was found that the contamination of plutonium varied with soiling time and with the acidity of the soiling solution. Maximum contamination was observed at pH 0.9.

The mechanism of contamination is discussed, and it is concluded that contamination would appear be promoted by the formation of aggregated plutonium produced by the interaction with the surface of the protein film.     

薄壁构件横截面不对称参数的通用求和公式

薄壁构件横截面不对称参数是计算弯扭屈曲临界弯矩的重要几何参数之一。该文推导了非形心主轴坐标系下不对称参数的积分公式,由不对称参数的积分公式推导了不对称参数的通用求和公式,进而化简得到单轴对称截面不对称参数的求和公式。采用不对称参数的通用求和公式推导了部分常用截面的β_x和（或）β_y的精确计算式或近似计算式,并对我国现行国标GB 50017-2003和GB 50018-2002、美国2013版AISI设计手册和SSRC协会的稳定设计指导、澳大利亚标准AS/NZS 4600： 2005等现有文献中β_x和（或）β_y计算式的精度进行了判定。研究表明,不对称参数通用求和公式的形式简单、计算可靠、便于应用。