浅谈深基坑支护的合理选择和应用

双排桩支护与排桩锚索支护和是深基坑支护的两种常见支护形式。通过深圳某小区深基坑支护工程,介绍了桩锚支护和双排桩支护设计方案,通过对两种设计方案的计算分析和监测结果对比,表明桩锚支护和双排桩支护体系较适于本基坑支护工程,合理选择支护形式对基坑工程安全性与经济性有很大的影响。     

矿井巷道支护中的支架支护技术

在煤矿生产中巷道支护可以稳定围岩状况、控制围岩运动的发展速度,维护工作空间安全。巷道支护分为分临时支护和巷道永久支护。巷道永久支护可分为锚杆(索)网喷支护、混凝土(料石)砌碹支护和支架支护。本文主要阐述了矿井巷道支护中,刚性支架支护工程验收标准、可缩性支架支护工程验收标准等问题。     

深基坑土钉支护研究综述

土钉支护成为了现代深基坑支护措施中强有力的手段,在国内基坑支护中己经成为继支撑式支护、板式支护后又一成熟技术.本文介绍了土钉支护的概念及其发展过程指出了土钉支护的优点及其局限性,总结当下土钉支护技术的研究现状及其发展前景.     

采空区下方煤巷锚梁支护技术探索与应用

采空区下方巷道支护一直是棘手的问题，传统支护方式为架棚支护，该方式不仅劳动强度大、支护成本高，且支护效果较差。为解决采空区下方支护难题，该矿充分借鉴肥城局雷庄矿桁架梁支护经验，结合现场实际，推广应用锚梁支护，取得了较好效果。     

试析煤矿巷道锚杆支护的作用和改进

煤矿特有的巷道支护涵盖了偏多的类别。巷道衔接着的支护,与附近架构下的围岩,有着互通的关联。巷道支护这样的可用技术涵盖了成套特性的支护技术。地质力学搭配着的测试、预设的锚杆支护、选取出来的支护原料、建造支护必备的机械、质量查验的可用路径,都可划归成如上的支护办法。锚杆支护这样的路径带有安全特性及实效特性,能促动支护成效的升高,助推了工作面的延展,增添了原有的煤炭产能。     

深井软岩高应力区大型硐室支护探索

针对深井软岩高应力区的特殊地质采矿条件,探索大型硐室的有效支护方式,提出了高强高预应力耦合让压支护理念,在支护设计上实现了锚杆、锚索及围岩间的耦合,在支护理念上突破传统的锚杆支护方法,设计合理的支护系统及注浆加固方法,使支护体形成巨大的预应力混凝土体强力支护围岩,很好地解决了类似条件下的硐室及车场、巷道的软岩支护难题。     

回采工作面支护参数的确定

回采工作面支护方式因工作面的支护地点不同分为一般支护和特殊支护,根据煤层赋存条件和矿压观测结果,确定工作面支护强度之后,合理支护密度的确定对于回采工作面的顶板管理起着常重要的作用。     

陈家山煤矿综放工作面全煤巷道锚网索支护技术

锚网索支护目前是煤矿井巷工程的一种主要支护形式,本文针对陈家山煤矿锚网索支护形式具体分析了全煤巷道支护机理,针对陈家山煤矿全煤巷道的特点,结合综放工作面全煤巷道锚网索支护经验,为陈家山煤矿4-2煤的支护提供了切实可行的支护方式。该支护方式可以降低支护成本,解决煤炭自然发火的隐患,进而减轻工人的劳动强度,具有显著的经济效益和社会效益。     

近距离煤层采空区下回采巷道的支护力学过程浅析

通过分析回采巷道的支护力学过程,提出合理的支护工况,确定相应的支护参数,研究其支护的可靠性和支护效果,更有效地促进巷道掘进期间的安全生产。     

深基坑支护工程的设计与施工优化

本文从深基坑支护方案的设计以及施工两个方面阐述了基坑支护优化的过程，并指出了深基坑支护工程是一个连续的过程，深基坑支护优化设计必须密切结合基坑周边环境特点，采用灵活多样的支护方式，辅以优化的施工工艺和信息化施工，才能达到安全、合理、经济的支护目的。     

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.     

企业专业化、标准化、集约化与信息化统筹建设方略

在国内外,很多优秀企业从愿景和价值观出发,通过工作流程对其进行分解并实现公司标准管理体系,通过管理信息化建设将工作流程加以实施,最终实现企业专业化、标准化、集约化工作流程固化和与之匹配的管理信息化平台。文章从专业化、标准化、集约化与信息化实现之间的关联分析出发,以实现专业化、标准化、集约化统筹规划运作与公司管理信息化系统软件实现为思路,以解决长期提升公司管理运作效率为宗旨,对统筹企业专业化、标准化、集约化与信息化建设进行探讨。     

The Geography of Innovation in China and India

The BRICS countries in general, and China and India in particular, are now widely regarded as the areas of the world likely to challenge the economic leadership of the United States (US) and the European Union (EU). A large part of this challenge will come from rapid technological catch‐up by China and India. Yet, despite a recent rise in interest, there is limited knowledge about how and where innovation takes place in these two leading emerging countries and to what extent the Chinese and Indian territorial systems of innovation differ from those in the EU or the US. In this article we explore the geography of innovation in China and India, concentrating on understanding key territorial‐level innovation trends by country, region and technology field, using the US and the EU as benchmarks. We find significant contrasts between the geography of innovation in China and India and that of the US and the EU. First, the degree of concentration of innovative activities in both countries is extremely high. Levels of agglomeration of innovation in the coastal provinces of China, as well as in Delhi and the South of India, significantly exceed the levels of agglomeration found in the USA and the EU. Secondly, China has witnessed a more rapid increase in the degree of concentration of innovation than India. We posit that the differences in the geography of innovation between, on the one hand, China and India and, on the other hand, between these countries and the developed world are rooted in different institutional settings, different systems of innovation and different national innovation strategies.     

Analysis of high dimensional multivariate stochastic volatility models

This paper is concerned with the Bayesian estimation and comparison of flexible, high dimensional multivariate time series models with time varying correlations. The model proposed and considered here combines features of the classical factor model with that of the heavy tailed univariate stochastic volatility model. A unified analysis of the model, and its special cases, is developed that encompasses estimation, filtering and model choice. The centerpieces of the estimation algorithm (which relies on MCMC methods) are: (1) a reduced blocking scheme for sampling the free elements of the loading matrix and the factors and (2) a special method for sampling the parameters of the univariate SV process. The resulting algorithm is scalable in terms of series and factors and simulation-efficient. Methods for estimating the log-likelihood function and the filtered values of the time-varying volatilities and correlations are also provided. The performance and effectiveness of the inferential methods are extensively tested using simulated data where models up to 50 dimensions and 688 parameters are fit and studied. The performance of our model, in relation to various multivariate GARCH models, is also evaluated using a real data set of weekly returns on a set of 10 international stock indices. We consider the performance along two dimensions: the ability to correctly estimate the conditional covariance matrix of future returns and the unconditional and conditional coverage of the 5% and 1% value-at-risk (VaR) measures of four pre-defined portfolios.     

武汉光电子产业标准与专利现状及推进策略研究

在全球市场竞争中,技术标准已成为企业抢占国际分工的关键环节及重要手段。在信息产业领域,专利借助技术标准这一载体与平台,逐渐成为国际贸易的游戏规则及非关税壁垒,谁控制了专利,谁就可以控制国际市场和国际贸易,技术标准与专利的结合是发展的必然趋势。文章在调研的基础上,对武汉光电子产业的的标准与专利现状进行了分析,并结合实际问题,站在企业的视角,对企业最为关注的专利进入标准的问题,提出了在实际操作过程中应注意的一些问题及对策建议。     

论年鉴编纂与志书编修的关系

年鉴编纂与志书编修是地方志事业的主要任务。文章分别概述了年鉴与志书的定义和特点,并从资料性、性质和功能、结构形式、语言风格及体裁方面分析了两者的相似之处,最后从时间期限、资料取舍、内容侧重点和体裁写法方面论述了两者的差异,论证了两者存在相互影响与相互衔接的关系。     

开放的网络环境下高校教育管理的研究

以大学生在开放网路环境下的思想行为和文化学习为研究对象,首先通过问卷调查和访谈的方式,在前期搜集数据分析的基础上,结合实际,比较大学生在网络上受到的影响与高校传统思想文化教育的同一性与差异性,并探讨目前大学传统思想文化教育与现实脱节的现象及原因分析,形成一套适用于大学结合现代网络环境对大学生实施教育管理的方法和方案。     

现代教学评价发展的路径探析

现代工业发展使教学评价的价值追求与意义追问成为关注的焦点,多元文化使评价标准的合理性遭到质疑,理念与实践的空白地带使操作面临两难困境。科学的评价体系和教学管理机制需要教学管理者具备开放的思维和支持的态度,重视多元评价主体间的合作,探索科学的方法和技术。     

论医院固定资产管理存在的问题及对策

就目前的社会经济而言,国家拨给医院的资金是很有限的,而正是因为这样,医院更应该在面对经费不足的时候,计划好开源节流,管理好现有的固定资产,并优化资源,努力提高社会效益以及经济效益。本文简单地探讨目前医院固定资产管理中存在的问题以及对策。     

建设工程项目索赔与反索赔技巧的研究

结合当前建筑市场发展趋势,对建设工程中常遇的索赔和反索赔技巧及要点展开了研究和总结,提出项目的索赔和反索赔对于培养和发展市场、促进建筑业的发展起着非常重要的作用。