疲劳裂纹扩展试验裂纹图像采集系统

针对目前金属疲劳裂纹扩展检测方法存在效率低、操作繁琐、精度不高，不能实现实时性等缺点，文章提出了基 于机器视觉的裂纹检测方法。根据金属疲劳裂纹扩展试验过程中裂纹图像的采集要求，设计了摄像头位置可自动调整 的疲劳裂纹图像采集系统，包括摄像头安装运动装置，裂纹图像采集装置以及摄像头运动控制系统。图像采集装置由高 分辨率黑白面阵CCD摄像头、光学镜头，光源照明装置和图像采集卡组成，前3者安装在摄像头支架上，与摄像头运动 装置相连。摄像头运动装置中的X，Y，，Z轴运动机构由步进电机带动滚珠导轨机构。在基于ARM技术的运动控制系统 的控制下摄像头可沿X，Y，，Z轴作高精度直线运动，实现和试件之间精确位置的调整。实验结果表明，所设计的系统可 采集到疲劳裂纹扩展试验过程中高清晰度、高分辨率的试件裂纹图像，满足下一步裂绞尺寸计算的要求；摄像头运动定 位精度可达到0. 02 mm，满足精确的系统聚焦、位置调整、跟踪采集的要求。     

Identity and integration: The roles of relationship and retention in nonprofit mergers

Prior research suggests that nonprofits are flexible and possess multiple identities, although we know less about how transformative changes, such as mergers, shape nonprofit identity. This qualitative study draws upon in‐depth interviews from 13 nonprofit merger cases to explore factors that influence postmerger identity and integration. In particular, we focus on the roles of organizational similarity and relationships, program and personnel retention, and rebranding. Ultimately, we derive a typology of postmerger integration in nonprofits and suggest that postmerger identity may be classified in terms of absorption, preservation, or creation. Implications for nonprofit leaders are discussed.     

When Working Hard Is Not Enough for Female and Racial/Ethnic Minority Apprentices in the Highway Trades

Drawing on employment records, qualitative interviews, and a survey, we explore the experiences of apprentices in the highway trades in Oregon. We demonstrate that female and racial/ethnic minority apprentices have lower rates of recruitment and retention and disproportionately face challenges with interpersonal interactions, hiring practices, and supervisory practices. Yet, we find a pervasive narrative that attributes apprentices' success to “hard work,” which contributes to the legitimacy of these inequalities. Consistent with the conceptualization of work organizations as inequality regimes, we argue that the apprenticeship system has policies, practices, and ideologies that are on the surface gender and race/ethnicity neutral, yet lead to the perpetuation of inequalities.     

Decision‐making under uncertainty in child protection: Creating a just and learning culture

The argument is made for having a positive error culture in child protection to improve decision‐making and risk management. This requires organizations to accept that mistakes are likely and to treat them as opportunities for learning and improving. In contrast, in many organizations, a punitive reaction to errors leads to workers hiding them and developing a defensive approach to their practice with children and families. The safety management literature has shown how human error is generally not simply due to a “bad apple” but made more or less likely by the work context that helps or hinders good performance. Improving safety requires learning about the weaknesses in the organization that contribute to poor performance. To create a learning culture, people need to feel that when they talk about mistakes or weak practice, there will be a constructive response from their organization. One aspect of reducing the blame culture is to develop a shared understanding of how practice will be judged and how those appraising practice will avoid the hindsight bias. To facilitate a positive error culture, a set of risk principles are presented that offer a set of criteria by which practice should be appraised.     

发展市场中介组织促进中小企业人力资源开发

针对市场中介组织的发展现状及存在的问题 ,着重从组织形式和服务内容两个方面 ,研究了发展为中小企业提供人力资源开发服务市场中介组织的目标模式 ,并提出了发展该类中介组织的对策措施     

运动元记忆训练对元记忆水平和动作记忆的影响

通过2个月的运动元记忆训练,检验其对非体育专业学生元记忆水平和动作记忆成绩的影响.结果显示运动元记忆训练能显著提高大学生运动记忆策略和记忆监控水平;结果还表明训练能明显提高大学生的艺术体操和健美操动作记忆成绩(表现在动作数量上),而且艺术体操动作记忆的训练效应大于健美操.     

三维运动混合机的性能及其影响因素

通过混合试验对三维运动混合机的混合性能及其影响因素作了分析与研究．     

女性主义文学批评综述

女性主义文学批评是妇女解放运动在文学批评界的分支,具有相当的社会价值.本文试图通过梳理女性主义文学批评的发展脉络、分析评述其重要的理论观点,进而把握女性主义批评的精髓要义,廓清其在后现代文化背景下的前景 和走向.     

日本政府"内向型"战争追悼理念及其成因

战后日德两国政府的战争追悼理念明显呈现"内向型"与"外向型"之差异。只向本国的战争罹难者特别是战死"皇军"将士和被处决战犯表示哀悼而拒绝向被侵略国家为数更多的死难者致哀,是日本政府"内向型"战争追悼理念的主要特征。其成因主要有四:"自卫战争史观"、"解放战争史观"、"靖国史观"等错误的历史观,是其形成的思想根源;日本政要的右派构成和日本政权的保守性质,是其形成的政治基础;战后秉持错误历史观的日本国民的大量存在,是其形成的社会土壤;战后宽松的国际地缘政治环境,是其形成的外部条件。     

晚清小说家眼中的立宪运动

晚清小说涉及宪政运动的大致可分为两类:一类是由立宪派所写,用来宣传立宪的内视角小说;另一类是小说家旁观品评的外视角小说.从晚清小说提供的视角中,我们可以看到立宪思想的传播和立宪的舆论准备,看到当时的普通人对立宪运动的看法,同时可以看到一个主义是否得到群众拥护,不在于其是否符合"历史规律",而在于其是否取得当时人的信任.