浮动支承式驱动装置的设计

介绍了浮动支承式驱动装置的结构及优点，采用传统力学方法对浮动支撑装置的销轴进行受力分析，为该类型产品的结构强度理论计算和设计提供了参考。     

QX-4隧道清洗车水罐等效力学模型分析

文章通过理论计算分析,可得出隧道清洗车水罐内部液态水晃动的固有频率及振型;通过ANSYS分析软件对水罐及内部液态水进行有限元仿真分析,得到水罐内部液态水晃动的固有频率及振型;对比两者结果,误差在有效范围内,理论计算结果正确;结合理论计算与有限元仿真分析结果建立水罐的等效力学模型,用于隧道清洗车的动力学仿真分析。     

正交胶合木的销槽承压强度研究总结与建议

文章总结国内外对正交胶合木（CLT）的销槽承压理论研究和试验研究进展，分析对比正交胶合木销槽承压的影响因子及测试方法的研究成果，总结现有的销槽承压强度计算方法，提出采用有限元方法对螺纹、层数和层厚、钢销刚度、拼缝等研究相对薄弱的影响因子进行全面分析，进而确定主要影响因子，研究成果可为今后建立适用于各种工况下的正交胶合木销槽承压强度计算公式奠定一定基础。     

1500m~3/h双履带斗轮挖掘机行走计算浅析

本文分析了斗轮挖掘机双履带装置的主要特点及工作原理,对其平地直行,坡道直行及平地转弯三种工况时的行走阻力进行了分别的计算分析,针对影响履带行走的因素提供了分析。对三种工况下的驱动力矩和功率进行了计算。     

隧道复合式路面结构的力学响应分析

运用有限元软件ABAQUS建立隧道复合式路面力学计算模型,选取沥青层内的剪应力和水平拉应变、水泥混凝土层内的水平拉应力及层间剪应力作为关键指标,全面分析竖向荷载、水平荷载及层间接触状态对复合式路面力学响应的影响。在力学计算结果分析的基础上,提出隧道复合式路面结构设计的合理建议。     

隧道衬砌结构内力有限元分析

文章运用荷载—结构计算方法,把隧道衬砌简化成合理的计算力学模型,并运用有限元方法进行数值内力计算,对其进行了结构分析。该计算方法计算精度可靠,过程简单明了,避免了结构力学计算法中内力集中的缺点。     

巷道开挖过程的三维有限元分析

利用Hoek-Brown岩体破坏准则,根据岩石试件的力学参数整合出岩体的力学参数,并建立三维有限元模型,以整合出的参数为依据进行数值计算.计算模型首先根据海姆假说设定原岩应力,而后利用"单元生死"技术较为真实得再现了巷道开挖过程.文章重点分析了无支护条件下,开挖引起的巷道围岩应力场、位移场重新分布的规律,为合理确定巷道支护参数提供了初步的有限元分析依据.     

裂后预应力混凝土梁力学性能分析

为了研究预应力混凝凝土梁开裂后的力学行为,本文以我国桥梁建设中30m预应力混凝土T梁为研究原型,采用ANSYS中三维弹塑性实体solid65单元建立了预应力T梁从开始受荷至结构破坏全过程进行非线性有限元模型,获取了预应力T梁加载全过程的变形、应变、裂缝等结构响应规律,分析了开裂后预应力T梁的力学特性。计算结果表明:有限元模拟结果和试验结果符合较好,同时也探索了适合实桥有限元仿真计算的方法。     

巷道开挖过程的三维有限元分析

利用Hoek—Brown岩体破坏准则，根据岩石试件的力学参数整合出岩体的力学参数，并建立三维有限元模型，以整合出的参数为依据进行数值计算。计算模型首先根据海姆假说设定原岩应力，而后利用“单元生死”技术较为真实得再现了巷道开挖过程。文章重点分析了无支护条件下，开挖引起的巷道围岩应力场、位移场重新分布的规律，为合理确定巷道支护参数提供了初步的有限元分析依据。     

行业动态

《杏》、《石榴》、《拖拉机履带销》、《拖拉机履带板》四项地方标准发布实施 这四项地方标准的制定和发布,对规范我区特色果品的生产和贸易,完善农产品质量标准体系,提高产品质量及出口竞争力和规范履带式拖拉机的配套零件生产和销售市场,减少和遏制安全事故的发生,保证农业生产的正常进行具有十分重要的意义。     

Value at Risk in the Suburbs: Eminent Domain and the Geographical Politics of the US Foreclosure Crisis

Several US counties and local governments have recently considered a novel solution to the foreclosure crisis. They plan to use eminent domain to compel the owners of mortgage debt—and specifically of private‐label mortgage‐backed securities—to sell the debt to the government at a price reflecting the loan's market value. The government would then restructure the debt and resell it to new investors. The plans are striking because—in contrast to both development‐driven eminent domain and the federal subprime bank bailout—they would force investors to assume asset devaluation and increased long‐term risk. Notably, the plans have emerged as an instance of financialization‐focused politics in suburbs and suburban cities of color, specifically majority‐black and ‐Latino/a suburbs. Local support for the plans, we argue, is rooted in the long‐term disinvestment of these ‘suburbs of exception', which became targets of subprime lending and eventually sites where the ‘financial exception' has been localized. But these demographic shifts, fragmentation and fiscal pressures have at the same time created a suburban political terrain in which the plans have gained their strongest political support.     

Towards a Theory of Serendipity: A Systematic Review and Conceptualization

Serendipity – the notion of making surprising and valuable discoveries – plays a major role in the success of individuals and organizations alike. Previous research has established the importance of serendipity and identified important individual- and organizational-level antecedents. However, the literature has been dispersed and the boundaries of the concept have been blurry, leading to a lack of conceptual clarity and structure, and thus limiting validity and managerial actionability. Based on a systematic literature review, I synthesize existing management-related research on serendipity and explicate the emergence and composition of serendipity in the organizational context. I first identify three necessary conditions that differentiate serendipity from related concepts such as luck or targeted innovation: agency, surprise, and value. Then, I draw from the literature on sensemaking, event-based theorizing, and quantum-based approaches to management to conceptualize the process of cultivating serendipity in the organizational context as a process of enabling potentiality and materialization, and develop a multi-level theory of (cultivating) serendipity. This conceptualization contributes to our collective understanding of how, why, and when (i.e., under what conditions) organizations can leverage the value in the unexpected, which opens up fruitful avenues for further research.     

Accountability of NGOs in Bangladesh A critical overview

NGOs in Bangladesh have been recognized as effective change agents in the socio-economic arena throughout the world. Their contributions in micro credit, non-formal education and primary health care are widely known. NGOs play a significant role in society. NGO accountability, as a result, has become a critical issue. NGO accountability in Bangladesh has been examined here in relation to patrons, clients and themselves. Of the three relationships only accountability to patrons is in a near satisfactory state. Accountability to clients is handicapped by lack of opportunities of beneficiaries to participate meaningfully in NGO policy making. Accountability to themselves is adversely affected due to the adherence to a strictly hierarchical system and the influence of founding and charismatic NGO leaders.     

Towards an Asian model of human resource management? A comparative analysis of China,Japan and South Korea

There has been much discussion regarding the possible decline and weakening of national systems of human resource management (HRM). Yet, culture and institutions are often cited as the major stumbling blocks to this outcome. Such constraints may dissipate in the analysis, particularly if ‘regional clusters’ are considered where geographic and cultural closeness and ‘openness’ to similar economic pressures exist. In such cases, it might be postulated that convergence in HRM will occur. We argue that China, Japan and South Korea represent such a cluster. This article examines these countries, to see if a degree of convergence is taking place and if it is towards an identifiable ‘Asian’ model of HRM. A model of change is presented that distinguishes between levels of occurrence and acceptance. Details of the development and practice of HRM in each country are then set out. The article ends with a discussion and implications section and a brief conclusion.     

The Creation of the Office for National Statistics

A new Office for National Statistics was created in the United Kingdom in 1996 following a series of developments designed to strengthen the relevance and integrity of statistics. This paper describes these fundamental changes and sets out a blueprint for future progress. It also sets current developments in the United Kingdom in an historical and international context.     

What helps? Women engineers' accounts of staying on

We have considerable understanding of the obstacles that women engineers encounter and the reasons that they leave the field, but we know less about what enables them to remain. Adopting an interpretivist approach, this article examines how a group of British women engineers in two FTSE 100 companies account for “staying on” in their male‐dominated work settings. We delineate four specific forms of help that facilitate women's retention in the field. We argue that exposure to help leads to women developing a habitus that enables them to continue working in engineering. To conclude, we draw on our findings to outline HR practices that will facilitate supportive relationships in the workplace and pave the way towards developing more positive organisational climates.     

论现代物流企业的发展观

物流业经过诸多年的发展目前已经成为最热门的行业之一,物流企业的注册数量也与日俱增,达到前所未有的规模。毋庸置疑,任何企业都希望自己迅速做强做大,并成为真正现代物流企业的典型代表,要实现这一目标一个首要问题就是要解决现代物流企业的发展观问题。     

浅谈大体积混凝土裂缝的控制

大体积混凝土的裂缝问题是实际工程中长期困扰工程技术人员的问题,其控制技术的研究是混凝土结构研究的热点问题,具有重大的学术价值和潜伏的工程背景。     

Supply Chain Strategies in the UK Fashion Industry—The Rhetoric of Partnership and Realities of Power

This paper focuses on the fashion industry, one characterised by issues such as dramatic shifts in the scale and power of major retail buyers in the market, the advent of retailer own brands, and the nature of sourcing and supply chain decisions, issues that are increasingly global in nature. The aim of this research is to explore the nature of relationships between UK high street multiple fashion retailers and their contracted suppliers, many of whom are entrepreneurial firms by most definitions of the term. Four core themes emerge from the literature and provide a framework for the research, namely, power, process, partnership, and people. The research approach was qualitative, and conducted over a period of twelve months. The paper ends with an agenda for future research.