三牙轮钻头滑动轴承失效分析

三牙轮钻头轴承的使用寿命直接决定了钻头的寿命。为了弄清三牙轮钻头轴承的失效形式、原因及机理，进一步提高三牙轮钻头轴承的寿命，分别对现场失效的三牙轮钻头轴承进行宏观和微观分析。结果表明，密封系统失效是轴承失效的主要原因之一。同时，轴承所受载荷过大且分布不均，温度过高导致材料表面金属强度和耐磨性降低，以及轴承与牙轮之间配合间隙过大，工作时晃动导致受力不均等原因也是造成牙轮钻头轴承的快速失效的主要原因。     

The Influence of Race/Ethnicity and Gender on Psychological and Social Well-Being

Abstract

Psychological and social well-being was investigated, using a sample of non-disadvantaged African American men and women, and White men and women. Three standardized scales, the Generalized Contentment Scale, the Kansas Marital Satisfaction Scale, and the Cohesion subscale of the Family Adaptability and Cohesion Evaluation Scale were used to measure well-being. The data were analyzed through t-test, ANOVA, and regression statistical procedures.

An association between race, gender and well-being was supported. More importantly, race was found to be the most important single variable in predicting levels of well-being. These results may support the continuing significance of race in the lives of African American individuals and families.     

神经网络的滚动轴承故障诊断

文章通过旋转机械故障实验平台,采集旋转机械故障实验台轴承的3种工作状态分别是轴承正常、轴承内圈裂缝、轴承外圈裂缝的振动加速度信号.对信号进行零均值化处理后,选择频率成分幅值较大的频率进行信号重组,提取其时域量纲特征值,利用神经网络进行故障类型的识别；通过实验,取得了很好的诊断结果.     

The Politics of Pain and the End of Empire

This article is a discussion of the role of feeling and emotion, and particularly the experience of pain, in contemporary global political events. In placing pain at the center of an analysis of a lived experience of global politics, the aim is to forge strategies to resist neoliberal imperialism and to create emotionally literate political communities. Drawing on the work of Elaine Scarry, Sara Ahmed and Frantz Fanon, the article situates the concept of emotions in a modern colonial landscape that is both racialized and gendered, complicated by neoliberalism as a subjectivity that contains the scope for emotions. As a case study, the article considers the emotions of viewing the deliberate infliction of pain through the circulation of the ‘Abu Ghraib photos’, particularly in the form of recent museum exhibitions in the USA.     

世界遗产:人类共同继承的遗产

申遗越来越火热,世界遗产及其保护主体的问题也得到越来越多的关注,这一问题的厘清,关系到遗产保护工作中的权责、动员和参与性等问题。通过对1972年《保护世界文化与自然遗产公约》背后的理念根源进行梳理,从比较宏观、中观的层面来分析世界遗产地及其保护的主体。     

电磁-温度耦合条件下推力磁轴承涡流损耗分析

针对一类以实心推力盘为主要热源的电磁轴承转子系统，研究了电磁-温度耦合条件下从线圈加电到稳定运行整个过程中的电磁场，给出了电磁场涡流损耗的解析计算方法．通过将实例的计算结果与有限元方法及实验结果对比表明，采用该解析计算方法可简单、快捷及准确地解决系统初步设计时的参数选定问题．     

Relative Spousal Earnings and Marital Happiness Among African American and White Women

The distinctive economic histories of African American and White wives suggest that involvement in household income production holds contextually situated unique meanings for these groups. Yet research has not addressed racial differences in the effects of relative earnings on marital well‐being. Surveying 431 employed wives in 21 U.S. cities, we found that wife‐to‐husband income ratio and marital happiness were negatively associated when women held traditional values, but in racially distinct ways. Among White women only, a negative association between income ratio and marital happiness was reversed when financial need was reported. Findings are discussed in terms of variability in the meaning of wives’ earnings as a function of situational, historical, and sociocultural dynamics.     

水润滑艉轴承负载能力的分析

以具有弹性的塑料轴承为例，分析相应的流体动力润滑机理以及水槽结构形式对其运行特性的影响．结果表明，一个连续的不开槽的轴承表面比一个开槽的轴承表面允许水力膜形成更高的动压力；长径比大的轴承，其负载能力亦相对较大。     

社会学的族群关系研究

文章介绍了族群社会学研究领域在社会学学科中的位置,说明目前中国开展这一领域研究的必要性和紧迫性,阐述了西方社会学在这个研究领域的主要研究内容与方法论的特点,讨论了从西方社会学的研究成果中我们所能够借鉴的知识,并对我国的"族群社会学"这个研究方向应当包含哪些方面的内容以及今后可能开展的研究工作提出了设想和建议.     

铁路机车轴承CAD——载荷分布计算

根据铁路机车轴承的结构特点,综合考虑滚动轴承座及内外套囤的弯曲变形,本文建立了轴承载荷分布计算模型。通过有限元分析计算,给出了轴承实际载荷分布值,并为轴承支座的刚性设计提出了设计要求和建议,为滚动轴承的CAD优化设计提供了切实可行的计算方法。