轴类工件平键槽划线工具

本文介绍的轴类工件平键槽划线工具简化了轴类工件平键槽的划线工序，避免了工件在加工机床与钳工划线平台间的搬运，方便了键槽加工时的找正工作，提高了工效     

浅谈B3—35／10汽轮机主轴靠背轮键槽的修复工艺

简述了无锥形端的汽轮机转子靠背轮键槽损伤后，用简易的手工方法修复的工艺，及在修复过程中保证双键槽的各项精度的措施。     

三峡电站转子支臂键槽板装焊工艺研究

本文分析了键槽板结构特点及焊接难点，介绍了装焊工艺方案以及生产制造的情况.     

谈轴伸清根槽和铁心台斜键槽

取消电机轴伸清根槽，增加轴肩圆角，消除清根槽引起应力集中的弊端。轴的铁心台平斜键槽以键长中点为中心两头扭斜，改善了槽形、减轻配合零件的啃伤、减轻装压吨位，提高了产品质量。     

SWZ型万向接轴螺栓断裂原因分析

介绍了SWZ型万向接轴的结构及特点，通过分析螺栓结构和受力情况，认为接手键槽磨损、接轴运动特性影响螺栓寿命是造成螺栓断裂的主要原因，提出修复磨损键槽、定期更换螺栓、改进加工工艺等解决措施。     

轴类零件键槽对称度快速检测专用量具

测量轴类零件键槽对称度时,在游标卡尺的游标外测量爪内侧加装一把测量尺,使外测量爪一长一短,在不破坏原游标卡尺精度的情况下组装出的结构简单、精度高、拆装方便、测量快速的这种测量工具,解决了轴键槽对称度无法直接测量的难题,提高了工效。     

初轧主电机转子轴键槽及结合面修复

本文阐述了采用专用组合机床现场修复西门子主电机转子轴键槽、结合平面的设计及工艺实施过程,对机构运动的可靠性进行了分析.     

无键槽辊环轴向定位孔型加工工艺设计

传统的辊环孔型加工利用心轴整体定位,依靠键联结传递动力,文章设计采用轴向定位的装夹方式,成功地进行了无键槽辊环的孔型加工,满足了生产需要。     

汽车变速箱同步器齿毂(异形键槽)模具的设计

随着我国的汽车制造业的快速发展,对作为汽车"心脏"的变速器要求也越来越高,对变速器内的同步器齿毂形状和精度要求也相应提高。本文对汽车变速箱同步器齿毂(具有异形键槽)模具进行设计,综合了在实际生产过程中遇到的各种问题,最终采用增大压制上外模冲、下外模冲与阴模局部配合面之间的配合间隙,同时在阴模键子上开个凹台,即逃粉槽的模具设计方式,避免了阴模键开裂,使具有异形键槽的同步器齿毂能大批量的生产,降低成本,提高生产效率。     

减速机齿轮轴断裂分析

针对减速机齿轮轴发生断裂现象,采用化学成分分析、断口分析、金相检验和力学性能测试对其原因进行了分析。结果表明,裂纹起源于键槽棱边应力集中处,向内疲劳扩展至断裂;棱边形状尖锐,弯曲应力集中较为严重,齿轮轴旋转时出现一定的弯矩载荷,棱边即能萌生裂纹源,引发疲劳断裂。分析结果为避免同类轴再次发生断裂提供了参考。     

Introduction to the special section on cognitive processes and psychotherapy.

Theoretical models featuring cognitive processes have played a fundamental role in advancing knowledge of psychopathology and its treatment and have emphasized the importance of cognition in psychotherapy. Recognition of the importance of cognition in psychotherapy has led to a number of questions that are addressed by the articles in this special section of the Journal of Consulting and Clinical Psychology. Cognitive therapy is well represented in the articles in this special section, but therapeutic procedures that do not represent typical cognitive therapy are also examined. The articles in this special section focus on homework in the modification of cognition, cognition in the treatment of anxiety in adults and in children, change in depressive cognitions in children, cognition and rapid change in the treatment of depression, and the role of cognition in the treatment and prevention of depression that is recurrent. Examination of these types of questions holds the possibility of advances in existing treatments and the possibility of innovations in new treatments. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

某铀矿区水稻土—地表水铀含量对稻米铀含量的影响

以水稻土—地表水铀含量为视角,从水稻土剖面铀含量分布规律、水稻土与下伏岩体稀土元素特征、不同河流不同河段水稻土—地表水—稻米铀含量特征、水稻土与稻米铀含量关系4个方面研究721铀矿区稻米铀含量成因。结果表明,水稻土剖面铀含量从表层至半风化花岗质基岩层呈明显降低的特征,说明水稻土铀含量高的原因不是土壤母质铀含量高;岩石与水稻土稀土元素标准化模式均表现为向右倾斜型,均属轻稀土富集型,轻稀土分馏明显,表明水稻土为还原环境,吸附作用较强;不同河流不同河段水稻土—地表水—稻米铀含量平均值的特性均为上游最低、中游最高、下游次之。铀矿区地表水环境符合铀元素在水稻土中被平衡吸附的动力学条件,有利于铀元素在矿区内河流中游地区的水稻土中沉淀富集;正在采矿区水稻土与稻米铀含量具有高度的空间耦合性,呈指数正相关关系,相关系数0.749。矿区内河流沿岸稻米铀含量的分布特征是由铀元素的迁移途径决定的"采矿活动(铀尾矿露天堆放)→地表水→水稻土"。     

球团链箅机回转窑工艺中氯和硫元素迁移规律

摘要：对链箅机回转窑工艺中各段球团样品进行实验分析,研究了氯元素和硫元素在链箅机回转窑工艺中的迁移规律,明晰了烟气中HCl的生成机制。结果表明,球团原料中的氯元素主要是以NaCl的形式存在,氯元素有一部分在链箅机抽风干燥段会转变成HCl气体并进入烟气,一部分在链箅机预热Ⅱ段之后以NaCl的形式汽化进入烟气,剩余的氯元素仍以NaCl的形式存在于成品球团矿中。烟气中的HCl气体是在抽风干燥段,由富含SO2的烟气与含水球团料层中的NaCl发生反应生成的,烟气中SO2转变成Na2SO4重新固定于料层中。在预热Ⅰ段和预热Ⅱ段,烟气中的SO2与原料中碳酸钙分解生成的游离CaO反应生成CaSO4,也会重新固定烟气中的SO2。     

NF-κB regulates prenatal stress-induced cognitive impairment in offspring rats.

The study was designed to investigate whether nuclear factor of kappa B (NF-κB) plays regulating role in prenatal stress-induced cognitive impairment and oxidative damage in offspring rats. The authors used a rat model to study plasma levels of corticosterone and oxidative DNA damage (8-OH-dG), protein expression of P65/p50 NF-κB, and cognitive function in female and male offspring rats in middle pregnant stage and later pregnant stage. Prenatal stress affected the capability of learning and memory in the offspring, especially in later stage stressed female offspring. The levels of corticosterone and 8-OH-dG were enhanced in response to stress. Both middle and later stage stresses induced a significant decrease in P65 expression and a significant increase in P50 expression in female offspring. In addition, later stage stress induced a significant decrease in P50 expression in male offspring. These results suggest that NF-κB complex may be acting in a positive regulatory fashion in prenatal stress-induced cognitive impairment and that oxidative DNA damage may exacerbate the activation of NF-κB. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于风险管控的矿区污染修复技术与模式综述

矿区环境的污染防治与生态修复是促进我国“十四五”生态文明建设的重要内容之一，促进风险管控与修复技术集成是治理矿山污染的必然趋势。回顾了近年来我国矿区污染的主要修复类与管控类技术，总结了风险管控模式下矿区污染场地一般修复思路，并在此基础上归纳概括了4种我国矿区的修复管控模式与实施案例，包括基于污染物时空分布、迁移转化规律、场地利用方式及风险等级的矿区修复管控模式。以期为未来我国建立涵盖风险标准体系与技术体系的场地治理模式提供参考与支撑。     

Integrating motivational, social, and contextual work design features: A meta-analytic summary and theoretical extension of the work design literature.

The authors developed and meta-analytically examined hypotheses designed to test and extend work design theory by integrating motivational, social, and work context characteristics. Results from a summary of 259 studies and 219,625 participants showed that 14 work characteristics explained, on average, 43% of the variance in the 19 worker attitudes and behaviors examined. For example, motivational characteristics explained 25% of the variance in subjective performance, 2% in turnover perceptions, 34% in job satisfaction, 24% in organizational commitment, and 26% in role perception outcomes. Beyond motivational characteristics, social characteristics explained incremental variances of 9% of the variance in subjective performance, 24% in turnover intentions, 17% in job satisfaction, 40% in organizational commitment, and 18% in role perception outcomes. Finally, beyond both motivational and social characteristics, work context characteristics explained incremental variances of 4% in job satisfaction and 16% in stress. The results of this study suggest numerous opportunities for the continued development of work design theory and practice. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

O. Chanute, C.E.

Octave Chanute was one of the leading civil engineers in the United States in the period between 1850 and 1890. His work on eastern and western railroads was unsurpassed. He began his bridge building career in 1856 and designed his last major bridge in 1888. Starting in 1890, he began his study in the work that others conducted in the area of manned flight and designed and tested many of his own gliders. He later assisted the Wright Brothers in their experiments in Dayton and at Kitty Hawk.     

冷却速率对KR脱硫渣中硫析出行为的影响

KR脱硫渣中主要成分(CaO)为转炉冶炼的优质造渣原料,通过氧化性气氛将渣中硫脱除后可将其用于转炉冶炼.但由于炉渣冷却制度不同,渣中硫的析出行为和赋存状态会发生变化,对炉渣氧化脱硫效果产生影响.基于此,以合成渣的形式探究冷速对KR脱硫渣中硫析出行为的影响,旨在明确KR脱硫渣中硫赋存状态及析出行为与冷却速率的关系,为后续...     

Tension and Compression Stability and Second-Order Analyses of Three-Dimensional Multicolumn Systems: Effects of Shear Deformations

The stability and second-order analyses of three-dimensional (3D) multicolumn systems including the effects of shear deformations along the span of each column are presented in a condensed manner. This formulation is an extension to an algorithm presented recently by the writer in 2002 and 2003 by which the critical load of each column, the total critical load, and the second-order response of a 3D multicolumn system with semirigid connections can be determined directly. The proposed solution includes not only the combined effects of flexural deformations and shear distortions along the columns in their two principal transverse axes, but also the effect of the shear forces along each member induced by the applied end axial force as the columns deform and deflect (as suggested by Haringx in 1947 and explained by Timoshenko and Gere in 1961) in their two principal transverse axes. The extended characteristic transcendental equations (corresponding to multicolumn systems with sidesway and twist uninhibited, partially inhibited, and totally inhibited) that are derived and discussed in this publication find great applications in the stability and second-order analyses of 3D multicolumn systems made of materials with relatively low shear stiffness such as orthotropic composite materials (fiber reinforced plastic) and multilayer elastomeric bearings used for seismic isolation of buildings. The phenomenon of buckling under axial tension in members with relatively low shear stiffness (observed by Kelly in 2003 in multilayer elastomeric bearings, and recently discussed by the writer in 2005) is captured by the proposed method. Tension buckling must not be ignored in the stability analysis of multicolumn systems made of columns in which the shear stiffness GAs is of the same order of magnitude as π2EI/h2.