无底柱分段崩落法采场结构参数确定探讨

无底柱分段崩落法是我国地下矿山采矿方法的发展方向之一。通过放矿理论分析,大间距和高分段结构形式是放矿效果最优的两种形式,结合我国矿山设备现状,大间距结构形式是我国无底柱分段崩落法的发展方向。通过对无底柱分段崩落法采场结构参数影响因素的分析,指出了确定结构参数应综合考虑矿体赋存状态、矿山凿岩、出矿设备以及采场地压等因素的影响,以使结构参数最优化,确保矿山安全、高效生产。     

Ⅳ62轨道下山大倾角施工组织方案优化

针对Ⅳ62采区轨道下山大倾角、下山施工循环进度低的问题,制定合理的施工组织方案,解决了岩巷大倾角、下山施工循环进度低的难题。     

The unemployment experience of male immigrants in England

In this paper the unemployment experience of immigrant men in the English labour market is examined, using 1993–1994 data from the Quarterly Labour Force Survey of the United Kingdom. Hypotheses proposed by Chiswick (1982) are investigated, for both the claimant count and the ILO measures of unemployment, using logistic regression analysis. Our results show that recent white and nonwhite immigrant men experience much higher levels of unemployment than earlier cohorts. For whites, this effect is transitory, whereas for nonwhites unemployment rates adjust more slowly as the duration of stay increases. Immigrant unemployment rates also vary considerably with country of birth.     

大型车辆前方路况识别显示系统

随着社会的发展,大型车辆在公路交通中占的比重越来越大。由于大型车辆车身尺寸大、视线高,会大大影响后车司机的行车视线,与小型车辆相比,大型车辆造成重大交通事故的概率更大。论文提出一种大型车辆前方路况识别显示系统,对紧随的后车进行提醒,对提高道路交通安全程度、降低交通事故发生率具有重要的现实意义。     

The role of Provincial Government Spending Composition in growth and convergence in China

China’s development policy since 1978 has differed across regions. With rapid aggregate growth has come widening regional inequality. The fiscal decentralisation reforms in 1994 shifted political pressure onto provincial officials to boost local growth through local public investments. These investments affect regional convergence by counteracting regulatory frictions in factor accumulation, and can also determine steady-state growth. However, the effect of public spending allocations across physical and human capital on growth and convergence processes is empirically unexplored for Chinese provinces. We take provincial time-series data on public spending by category, finding local public spending and its components augment convergence rates differently across regions. Spending on education and health contributes significantly more to growth and convergence than capital spending, confirming that the public capital-spending bias is not a local growth-optimising strategy. We suggest a policy of aligning local government promotion incentives to human capital targets to correct local resource misallocation.     

中国大企业持续成长内在驱动因素

许多大企业发展到一定的规模,便失去了持续发展的动力,辉煌一时的诸多企业都纷纷沦为亏损、倒闭或发展停滞。如何保持持续成长已成为中国大企业普遍面临的一大问题。正是基于这样一个背景,试图探究中国大企业持续成长的内在驱动因素。首先对企业成长驱动因素理论与企业生命周期理论进行了回顾,然后在简述中国大企业特征的基础上,分析了中国大企业持续成长的五个内在驱动因素,包括创新、人员、质量、组织制度与风险控制,接着构建持续成长驱动体系,最后提出了对中国大企业的一些建议。庆立军     

Effect of consumer sentiment on hospitality expenditures and stock returns

Given the importance of consumers to the U.S. economy and especially to the hospitality industry, we explore how consumer sentiment (i.e. confidence in the economy) affects consumption expenditures and stock returns in the hospitality industry.We find that not only does consumer sentiment partly predict changes in future consumption expenditures, but changes in consumer sentiment are contemporaneously related to hospitality industry stock returns. More importantly, our results indicate that changes in consumer sentiment can partly predict changes in stock prices of hospitality firms, an indicator of firm performance. The predictive ability of consumer sentiment can thus be useful to managers in business forecasting, planning, and strategizing for profit maximization.     

跨广清高速公路特大桥钢桁梁拖拉施工技术

文章通过分析广珠铁路跨广清高速公路特大桥钢桁梁拖拉施工技术,总结了钢桁梁拖拉施工方法,为钢桁梁拖拉施工提供了有益的施工经验。     

Health care resource utilization and burden of disease in a U.S. Medicare population with a principal diagnosis of osteoarthritis of the knee

Abstract

Aims

To assess the prevalence, health care resource utilization (HCRU), and economic burden of disease among Medicare beneficiaries with a principal diagnosis of osteoarthritis (OA) of the knee.     

财政支出结构对安徽省县域经济高质量发展的影响

构建经济高质量发展评价指标，使用安徽省2011—2020年的县域相关数据，利用面板空间杜宾模型（PSDM），检验财政支出结构在各县域经济高质量发展中的作用。结果表明：教育、节能环保、文化体育和传媒、医疗卫生类财政支出能够显著推动安徽省县域经济的高质量发展；社会保障支出的增加总体上抑制了县域经济的高质量发展；不同的财政支出项目对皖北、皖中和皖南各县域经济高质量发展的影响方向和程度有一定的异质性。