刮板输送机机尾自动张紧系统研究

刮板输送机是综采工作面运煤系统的主要输送设备,它承担着将工作面煤碳的输送工作,利用刮板链的循环运动输送煤炭。为了保证刮板输送机的正常使用,保证刮板链合理的张紧状态显得格外重要,研究一种刮板链自动张紧系统,通过在刮板输送机伸缩机尾设置张紧自动监测装置,实时监测与反馈刮板链的张紧,再利用液压油缸控制伸缩机尾的伸出量,实现刮板链张紧的自动控制,结果表明:此液压张紧系统基本满足煤矿井下刮板输送机机尾的自动张紧控制要求。     

大粒度埋刮板输送机探讨

本文通过对埋刮板输送机的刮板、物料粒度及刮板速度三因素试验分析．导出刮板与机槽间隙的确定原则，确定了板式刮板和圆钢刮板适用范围。     

关于刮板输送机中间机身段的创新使用——梅花井煤矿原煤仓分仓刮板输送机

本文以梅花井煤矿原煤仓上SGB1400/220D型双边链刮板输送机使用中,减小刮板输送机刮板链、刮板及耐磨板磨损量,增加其寿命的可行性方案进行论证。     

面向维护的刮板机可靠度建模与预测

本文主要的工作思路为:首先对刮板机零件失效的主要影响因素进行分裂研究,分组确定刮板机的可靠度,进而综合对刮板机结构应力规律的分析,面向维护形成刮板机可靠度的仿真模型,最终进行可靠度预测。     

刮板运输机机尾伸缩油缸压力在线监测系统研究

为使刮板输送机链条和链轮始终处于一个良好的啮合状态,在现场对刮板输送机刮板链张紧力状况进行实际监测与控制,为刮板输送机的检修、维护、紧链、掐链工作提供了一套工作可靠性的理论依据。     

刮板板输送机的磨损及对策分析

煤矿生产运行中,刮板输送机是较为常用的设备,也是综采工作面机械设备中的重要部分。由于刮板输送机的工作环境较为恶劣,且受到煤矿所在地质条件的影响,加之其余各个机械设备之间配合使用,就会导致刮板输送机遭到严重磨损而缩短使用寿命。降低刮板输送机的磨损率成为了目前重点研究的问题。本论文针对刮板板输送机的磨损及对策。     

刮板输送机刮板链预紧力分析

刮板输送机在负载工作前需要对刮板链施加一定预紧力，以保证在负载条件下运行正常。预紧力是否合适对刮板链工作性能有直接影响。以双机驱动刮板输送机为例对刮板链预紧力进行分析计算，为合理选择预紧力提供一定参考。     

谈谈刮板输送机的维修

本文从刮板输送机的维修内容、刮板输送机正常运转时维修质量标准、试运转,检查维修效果、维修时需要注意的安全问题四个方面谈了刮板输送机的维修问题。     

刮板输送机可靠性评价方法探讨

本文首先介绍了选煤厂用刮板输送机的结构以及可靠性方面的相关理论,在此基础之上,介绍了刮板输送机可靠性的相关指标,从而对刮板输送机可靠性评价方法进行了分析,这一分析过程有助于掌握刮板输送机的可靠性状态,确保选煤厂生产过程的安全与可靠,具有一定的工程应用价值。     

矿用刮板输送机传动系统可靠性刍议

文章对矿用刮板机及其传动系统的可靠性进行了简要介绍,阐述了刮板机传动系统部件的常见故障和问题,并结合笔者自身的工作实践,对刮板机传动系统可靠性的改进和提升提出了见解。     

Alternative Capitalism and Creative Economy: the Case of Christiania

The Free Town of Christiania is an autonomous community of about 1,000 inhabitants in the centre of Copenhagen. Built as a squat for a hippy community in the 1970s, it is today a central node in the geography of activism, anarchism and alternative social life. This article analyses Christiania from the specific perspective of creativity and within the context of the ‘creative city’ debate. The Free Town is a lively innovative milieu, nurturing the arts, social experimentation, ideas and original architectural solutions. As such, it is becoming a more and more relevant space from the point of view of the market economy and in the promotion of the idea of a ‘creative Copenhagen’. But I argue that much of its creative potential is connected to place‐specific socioeconomic factors. In this sense, the Christiania experience troubles mainstream conceptions of creativity by revealing that creativity is both fluid and situated.     

岩溶地区桩基设计施工及监控措施探讨

随着桩基施工技术与设计方法研究的不断深入,岩溶地区桥梁桩基的设计理论、施工技术及处理方法的研究也变得日益重要。文章结合某桥桩基的施工技术,研究岩溶地区桩基设计、施工应该考虑的一些因素,从监理的角度对监控措施进行了简要的分析。     

Swedish tribalism and Tanzanian entrepreneurship: preconditions for trust formation

The aim of this paper is to explore the relationship between entrepreneurship and the structure of the periphery. The objective is to reach an understanding of the entrepreneurial process within the context of the periphery, which is traditionally seen as a poor environment. The paper considers the concept of peripherality and identifies a process of gravitation that drains higher order services towards the core. However, this deterministic model does not correspond with the realities of the Scottish Highlands. The paradox is that new businesses are being created that appear to use old redundant peripheral values such as tradition. It is argued that it is the social construction of the periphery that produces this post-modern change. The qualitative methodology indicates the emergence of a new spatial paradigm of aesthetic consumption. Two indicative case studies are presented which show that entrepreneurship is the creation and extraction of value from the environment. Their businesses are the commodification of non-material and aesthetic values. Further analysis of these data demonstrates that entrepreneurs interpret their own version of the environment, rather than merely reacting to it. In turn, they enact this interpretation which forms the basis of their businesses.     

Urban Informality and the State: Geographical Translations and Conceptual Alliances

Understandings of informality commonly derive from research undertaken in states perceived as lacking the capacity to regulate the practices of their populations. This Interventions forum aims to expand the geographical parameters of empirical research on urban informality. A more global approach, we argue, also necessitates questioning assumptions that undergird this concept—in particular the underlying conception of the state. In this vein, this collection of papers aims to rethink theories of the state through the lens of informality, and vice versa, to inform and refine the concept of informality through a more thorough understanding of states. In so doing, the contributions engage with concepts that have been central both to theories of the state and to the study of informality, namely governance, agency, legitimacy, sovereignty and legality. Following this introduction setting out our theoretical approach, the Interventions forum unites five empirical studies that discuss the nexus of informality and states in contexts that have been researched less extensively from this perspective, each tackling one of the above‐mentioned concepts. Based on these different entry points, the papers provide novel angles on a state‐theoretical understanding of informality. A concluding essay brings these approaches together, reflecting on the possibilities of translating concepts to different sites.     

试论加强煤炭企业财务管理的有效途径

加强煤炭企业的财务管理,要在科学发展观的指导下,更新观念,抓好财务自身建设;要通过多种教育途径,提高财务人员素质;要建立和优化机制,抓好资金管理,降低生产成本,实行多元财务监控,获取最大利润;要抓好信息系统建设,利用现代网络技术手段,提高财务管理效率.     

Experiencing a New Place as an Atmosphere: A Focus on Tours of Collaborative Spaces

In this article, we ethnographically explore how tour guides convey different embodied experiences of space and place during tours of collaborative spaces. These tours draw on participants’ embodied experience and emotions in order to reveal the invisible dimensions of everyday activities of collaborative spaces, in particular their different organizational atmospheres. By systematically coding 110 tours of such spaces, we identify four emotional registers – “initiation,” “commodification,” “selection,” and “gamification,” which are used by tour guides to produce a particular atmosphere. We feel that the concept of “atmosphere” is a powerful means of exploring the unbounded and fluid spatiality, the quasi-materiality, and the temporality of the work practices that individuals are likely to experience if they become members of these collaborative spaces. We conclude our analyses by considering the implications of this study for the management of collaborative spaces and new work practices more generally.     

TRIZ理论在价值优化中的应用

文章将TRIZ理论引入到价值优化中,通过对机械产品的价值分析,确定出价值优化对象,这时可运用TRIZ方法,把实际的问题转换为TRIZ问题,并通过相应途径增加价值优化对象的价值,提出创新方案,从而解决需要价值优化的实际问题,达到较好地完成产品价值优化的目的。     

Urbanization and the City Image in Lowry at Tate Britain: Towards a Critique of Cultural Cityism

This article explores cultural cityism at a time when a more expansive, ‘planetary’ urbanization is argued to have superseded ‘the city’ as the dominant urban form. It takes an essentially Lefebvrian problematic and works this through an examination of one aspect of contemporary metropolitan culture, the L.S. Lowry exhibition at Tate Britain, held in the summer of 2013. The article scrutinizes the juxtaposition of Lowry's images of the industrial city with the image of ‘global’, corporate London provided by Tate Britain itself. The exhibition is presented as evidence of Lefebvre's argument that although the urban core has imploded and exploded, through images the city ‘can perpetuate itself, survive its conditions’. Taking stock also of the preponderance of city images in culture more widely, it is argued such images make a fetish of the city, producing also an ‘urban pastoral’ that obscures the defining characteristics of urban life today. Finally, Benjamin's concept of the ‘dialectical image’ and Rancière's notion of the ‘sentence image’ are invoked to capture the flashing together of past and present city images and the opportunities for critical reflection this constellation presents.     

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.