陶瓷刀具材料的研究进展

陶瓷刀具材料是一种先进的刀具材料.文章介绍了陶瓷刀具材料的特点和种类,指出了陶瓷刀具材料发展方向,并展望了其发展前景.     

新型刀具材料的研究现状

文章分别介绍了涂层刀具和陶瓷刀具使用材料及使用过程中的注意事项,并对两种超硬刀具材料进行了简单描述,总结了我国刀具材料的发展方向.     

电磁强化处理对硬质合金涂层刀具组织及性能的影响研究

研究了电磁强化处理对硬质合金涂层刀具物理性能、微观组织、残余应力及切削性能的影响。结果表明,电磁强化对硬质合金磁性能及力学性能均无明显影响,却使刀具寿命提升了18.9%,相同切削时间的后刀面磨损量减小了27%。通过XRD测试刀具残余应力,结果表明电磁强化降低了刀具刃边的残余应力。通过SEM表征刀具微观组织,发现电磁强化提高了材料致密性,减少了微裂纹数量,从而可提高刀具的抗崩损能力。此外,电磁强化刀具切削表面吸附的球形纳米氧化物颗粒起到了减少摩擦、提升刀具抗磨损能力的作用。     

西德克虏伯.维迪阿生产的新型刀具

西德克虏伯·维迪阿推出了各种新型切削刀具和切削刀具材料。这些包括采用两种新型金属陶瓷牌号制成的非涂层刀具,在新型碳化钨基上使用新一代涂层的涂层刀具,并还推出了金属成型刀具的新型牌号。     

浅谈加工模具中刀具材料的选用

分析了焊接切削用刀具在切削性能和加工精度方面的不足,比较了新型模具材料的优缺点,认为氮化硅系陶瓷刀具和碳化钛基硬质合金刀具。适合加工小型模具,而大型模具使用涂层硬质合金刀具较为合适。     

宝钢特殊螺纹接头螺纹加工刀具的设计

刀具研制是宝钢特殊螺纹油管接头开发工作的重要环节之一，基于与现有刀具系统通知,主研制了新型结构的螺纹切削加工刀具；同时探讨了刀具的齿形设计、内冷却嘴技术。     

超细晶硬质合金刀具Co含量对其耐磨损性的影响

用不同Co含量的超细晶硬质合金刀具对高温合金GH2132进行了高速连续切削试验,根据最小二乘法对试验结果进行了线性回归,建立了刀具寿命与切削速度之间的关系即T-υc经验公式;随后进行了高速断续切削刀具磨损试验,用连续变倍体视显微镜及显微摄影系统观察了刀具刃口和后刀面的磨损形貌,并对达到磨钝标准时的刀具后刀面磨损微区成分进行了电子探针能谱分析,探讨了粘结相Co含量对刀具磨损性能的影响机理。结果表明:粘结相Co含量过高或过低,均会降低刀具的耐磨损和破损性能。     

高速钢大型刀具热处理裂纹的预防

针对高速钢热处理过程中容易出现裂纹的问题,分析了高速钢大型刀具热处理的难点和工艺的复杂性,介绍了防止刀具热处理裂纹的主要措施、刀具在磨削过程中产生裂纹后的处理方法,从而减少刀具的热处理裂纹倾向。     

用于加工渐开线曲面的刀具设计

文章通过对渐开线的性质和渐开线齿轮齿条啮合原理的分析，详细地阐述了加工渐开线曲面刀具的设计方法，主要是从刀具角度、刀具有效长度和刀具的定位这三个方面来设计刨削刀具。     

硬质合金刀具新技术研究进展

随着硬质合金研究的进展,硬质合金刀具已在越来越多的领域代替常规刀具材料。笔者从硬质合金刀具的性能和应用、烧结技术、及表面加工等方面,综合评述了近年来国内外硬质合金刀具新技术的研究成果。     

Impact of Federal Environmental Requirements on Proposed Highway or Bridge Project

Prior to construction of a bridge or highway, the National Environmental Protection Act (NEPA) requires an evaluation of the effect of the project on the human environment. The purpose of NEPA is to require the head of the federal agency that is committing funds to the project to consider its actions before deciding to proceed with the project. This paper will analyze the general provisions of NEPA to remove some of the mystery related to the environmental concerns raised by bridge or highway projects and to emphasize to transportation planners that these concerns must be addressed prior to beginning a major bridge or highway project. The intent of this paper is to provide some guidance to transportation planners in light of these statutes as they begin the planning stages for highway and bridge projects.     

固定式精炼炉的改进

江西铜业集团公司贵溪冶炼厂(简称贵冶)固定式精炼炉,因其在设计上存在缺陷及生产工艺的改变,不能满足生产的需要。在生产实践中积累经验后,将其进行技术改造。将改造前后的不同状况列出进行比较,从而阐述改造后取得的效果,最后列举出贵冶固定式精炼炉目前还存在的不合理因素,并设计出解决的方案,做到工作持续推进。     

Report of the Treasurer: 1980: Onward, financially and morally.

APA is in very good shape financially as a result of procedures and attitudes within the Council of Representatives and elsewhere in the Association's governance. We are able to maintain a balanced budget and to enjoy surpluses--though we can be certain that this will not continue forever--and at the same time to be reasonably solicitous of personal and social needs of the disadvantaged in our midst. At a time when the federal government finds it necessary to abandon or drastically cut programs to help the voiceless and other victims of our society, it is heartening to note that in our small way we psychologists are able to walk both sides of the street, that is, to help those who need our help, but to do so without imperiling our financial solvency. Despite spiraling inflation, the Association continues to produce a surplus from operations, as mandated by the Council of Representatives, while being responsive to the needs of the membership in a swiftly changing environment. In addition to the goal of building our reserves, we are dedicated to the continuation of all existing APA programs in our constant attempts to advance psychology as a science and profession and as a means of promoting human welfare. Financial statements for 1979-1981 are provided. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Modeling Residual Displacements of Concrete Bridge Columns under Earthquake Loads Using Fiber Elements

Nonlinear dynamic analysis with fiber-element models is now widely used to assess the seismic response of bridge structures. The ability of such models to accurately simulate response parameters for characterizing the postearthquake condition of bridges, namely residual displacements, is assessed by comparison of analyses of dynamically loaded reinforced concrete bridge columns to experimental data. The models are unable to capture residual displacements, and the cause of the inability to capture residual displacements is investigated through dynamic analysis of fiber-element and single-degree-of-freedom (SDOF) models. A certain type of pinching present in the numerical hysteretic response shape is found to lead to poor residual displacement simulation both in the SDOF models and in fiber-element models. When eliminating this pinching, improvements to residual displacement simulation are found. A modified concrete constitutive model representing damage accumulation from cyclic loading is implemented for the fiber-element analysis that incorporates changes to reloading behavior when moving from high tensile strain back to compression. Analysis using the modified concrete constitutive model leads to improvements in the ability of the fiber-element model to capture residual displacements.     

论我国会计委派制度试行中存在的问题及对策

会计委派制度有利于防止国有资产流失,保证会计信息的真实可靠性,强化会计核算和监督的力度,但在实施过程中存在委派会计人员不能充分发挥其职能作用,委派会计制度流于形式,委派会计人员的后续管理不完善等问题,必须加强对会计委派制度的重视程度,明确委派会计的任职条件和具体职责,建立委派人员的业绩考评制度和后续教育制度。     

Psychotherapy and Magic.

Discusses the extent to which the practice of psychotherapy places stress upon its practitioners similar to those experienced by the native fisherman of the Trobriand society, and the extent to which such stresses give rise to magical thinking. The observations in this article are based on a study of Trobriad society by Malinowski (in J. Needham's Science, Religion, and Reality). The author concludes that the ideal temperament for the psychotherapist if he is to behave rationally in his work involves the ability to reject the magic which the uncertainties of his task and the demands of his patients throw upon him; to be flexible enough to change his views when the need is clearly indicated, but not to be a weathervane; and to be happy enough in his personal, extratherapeutic life to accept failures as part of the day's work. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Rapid Bridge Replacement under Emergency Situation: Case Study

The terrorist attack on September 11, 2001, and subsequent potential threats to the United States transportation systems have presented an urgent need to elevate the security of the transportation infrastructure and to develop emergency response plans to quickly react to the possible consequences of an extreme event. Highway bridges, as critical components of the nation’s transportation network, have been brought to closer attention by government agencies. A research project was conducted to identify strategies and technologies to restore the use of a damaged bridge quickly. One of the tasks associated with the research was to perform several case studies of previous bridge replacements following extreme events. These events include explosion and fire caused by vehicle impact, vessel collision with a bridge, and damage caused by flood and earthquake. By studying the cases, the research team seeks to identify and expand on lessons learned and address which actions did and did not work well given the circumstances of the incident. These lessons have great value to the people who need to develop and implement an emergency response plan.     

ZD80减速器的设计

在ＺＤ８０减速器的设计中，对减速器箱盖采用了焊接结构，大齿轮采用组合结构；轴承采用刮油润滑方式，对于单向运转的减速器，装配型式可改为双端输入输出；在确定减速器配置方式时，应使承受最大作用力的轴承座上盖螺栓不承受拉力。     

La relation père-enfant, la nature et l’organisation des relations d’attachement.

Faithfully following the tradition of Bowlby’s theoretical framework, until recently research in developmental psychology has more often confirmed the importance of attachment to mother than to father in their children’s development. Based on this statement, Paquette (2004) proposed a different theoretical model to account for the father’s specific role in children’s development. The purpose of this review of the literature is to examine results of studies including measures of attachment to mother and to father and to answer the questions raised by different theoretical models accounting for the organization of children’s attachment relationships, that is to say hierarchy in children’s attachment to mother and to father, correspondence between the quality of these two relationships and their influence on children’s development. Whether the attachment theoretical framework seems to partially account for the specificity and the complementarity of parental roles, results of the studies reviewed in this article underline the necessity to operationalize the activation dimension of attachment relationships (Paquette, 2004) in order to better understand how children’s attachment relationships to parents do develop and how they do organize themselves to influence children’s development. (PsycINFO Database Record (c) 2010 APA, all rights reserved)