深部软岩巷道交叉点耦合注浆加固机理及应用

针对韩咀煤业2煤西翼辅运大巷与新掘巷道交叉点位置巷道围岩破碎、底鼓严重的现象,提出了"深浅孔、高低压"耦合注浆加固方法,阐述了耦合注浆加固机理,改善了传统注浆加固方法,从根本上提高了巷道围岩的整体性,改善围岩受力状态,提高了其承载力。现场实践表明:采用"深浅孔、高低压"耦合注浆加固方法对巷道进行加固,极大的改善了围岩受力状态,有效的控制了巷道变形及底鼓,实现了对巷道的长期稳定控制。     

大断面、联合支护技术在软岩巷道中的应用

平煤股份六矿二水平-440大巷为软岩巷道,围岩松散破碎,围岩主要以泥岩、沙质泥岩为主,为满足矿井发展需要对-440大巷进行大断面扩修。在分析了巷道岩性的基础上,提出了锚、网、索+喷浆+注浆+注浆锚索联合支护的施工方案,并进行了工业性试验。试验表明,该技术支护效果良好,并取得可观的经济效益。     

综采面切眼锚网、锚索支护技术及施工工艺

针对平煤股份六矿丁6-22170综采面切眼围岩特点及对巷道的要求,依据锚杆支护的悬吊、组合梁及楔固等共同作用机理,通过理论计算设计结果,提出了该切眼锚网支护主要技术参数及施工工艺,为在类似条件下综采面切眼进行锚网、锚索支护提供技术参数。     

半煤岩掘进光爆管理的几点做法

半煤岩巷道实行光爆对巷道围岩破坏小,巷道成型规整,提高巷道稳定性,保证了施工安全,加快施工速度。减少了巷道维修量和巷道通风阻力,节省了费用。     

深部巷道支护技术研究

煤矿深部开采巷道与浅部巷道的主要差别是围岩存在破裂区,也是深部巷道支护的重点之一。由于破裂区的存在,巷道支护应以护为主,防止围岩破裂范围扩大,巷道失效。理论与实践证明巷道底角采用弧形,加强断面底角与肩部等关键部位的支护强度,使巷道整体收缩变形,可有效防止深部巷道的破坏。     

深部巷道支护技术研究

煤矿深部开采巷道与浅部巷道的主要差别是围岩存在破裂区,也是深部巷道支护的重点之一。由于破裂区的存在,巷道支护应以护为主,防止围岩破裂范围扩大,巷道失效。理论与实践证明巷道底角采用弧形,加强断面底角与肩部等关键部位的支护强度,使巷道整体收缩变形,可有效防止深部巷道的破坏。     

岩巷布置层位与安全质量研究

布置在二1煤底板以下不同岩性的巷道,普遍存在不同程度的变形及底鼓;建立了岩移观测站,确定巷道的岩移变形速度,确定巷道围岩的松动圈,分析影响巷道安全质量的因素,评价巷道层位与安全质量,建议设计部门合理布置巷道层位,提高巷道安全质量,保证矿井安全生产。     

急倾斜煤层回采巷道破坏机理与支护技术探究

针对急倾斜煤层回采巷道变形破坏独特性以及巷道难支护问题,文章探讨了急倾斜煤层回采巷道的破坏机理以及有效的巷道控制措施,并结合工程实际,分析了锚梁网联合支护在急倾斜煤层回采巷道支护中的应用;结果表明:通过巷道断面优化与支护参数的改变,巷道围岩变形量与变形速度得到了有效控制,满足了巷道的使用要求。     

在高应力软岩巷道一次成巷修护工艺研究

根据-800m西-采区石门高应力软岩巷道变形特点,巷道修护采用风搞、长把手稿破岩保持巷道的围岩的完整性不被破坏,老锚杆锚固端留在巷道内加固巷道围岩,采取锚、网、梁、喷、索、注浆联合支护,明显地改善了巷道围岩受力状态,增强了巷道整体的承载能力,提高了巷道支护的稳定性,支护效果很明显,确保一次成巷.     

不同巷道断面形状对围岩稳定性的数值模拟研究

巷道断面形状是影响围岩稳定性的关键因素.为研究断面形状对巷道稳定性的影响,对矩形、梯形和直墙圆拱形三种巷道断面形状进行了数值模拟研究,并分析了不同断面形状巷道围岩的应力特征、变形特征和塑性区域.结果表明:直墙圆拱形巷道围岩稳定性最好,梯形巷道次之,矩形巷道稳定性最差.     

Choice in Currency in Iceland

An Icelandic post-graduate student at Oxford outlines a method of preventing inflation that could be applied in other countries.     

关于高职院校数学教学中开放题的有关问题初探

本文着重于讲解在高职院校数学教学中常出现的几种开放题,对它们的解法加以研究,归纳其一般思路、解法及其解答技巧,希望能有助于今后高职院校数学教学研究活动,供参考之用。     

Developments in human resource management in manufacturing in modern Britain

In this paper, developments in human resource management in manufacturing in modern Britain based on a national sample are examined. The organization and role of human resource management, employee involvement, training and development, work practices and rewards are all targeted for an assessment of current practices. This is a prelude for a contrast between manufacturing and non-manufacturing. The conclusion is that the similarities between manufacturing and non-manufacturing substantially outweigh the differences. By inference, too, developments in human resource management practices are likely to reflect changes in the broader environment of businesses (and differences between companies) rather than being specific to the main industrial sectors.     

Explaining Inter-Provincial Inequality in Productivity Growth in Crop Production in Pakistan

Abstract

Data on crop production are assembled for four provinces—Punjab, Sindh, North-West Frontier Province and Balochistan—for the period from 1980/81 to 2005/06 to examine inter-provincial differences in productivity growth rates. Propositions are put forward and examined to explain the superior productivity performance of Punjabi crop producers over those in Sindh and North-West Frontier Province, and the unusual productivity trends in Balochistan. The major factors relate to economic infrastructure and human capital. The impact of agricultural research is difficult to discern, and further work is required to assess the lagged effects of research expenditures on TFP growth.

Explication des déséquilibres interprovinciaux dans l'augmentation de la productivité dans la production de cultures au Pakistan

RÉSUMÉ On a rassemblé des données pour les quatre provinces suivantes: Penjab, Sindh, Khyber-Pakhtunkhwa, et Baloutchistan, pour la période 1980/81 à 2005/06, afin d'examiner les différences interprovinciales dans les taux d'expansion de la productivité. On présente et on examine des hypothèses pour expliquer le rendement supérieur des producteurs du Penjab par rapport à ceux du Sindh et du Khyber-Pakhtunkhwa, ainsi que les tendances de productivité inhabituelles du Baloutchistan. Les principaux facteurs se rapportent à l'infrastructure économique et au capital humain. L'impact de la recherche sur l'agriculture est difficile à établir, et des travaux supplémentaires seront nécessaires pour évaluer les effets décalés des frais de recherche sur l'expansion du TFP.

Explicación de la desigualdad inter-provincial en el crecimiento de la productividad de la producción de cultivos en Pakistán

EXTRACTO Se recopilan datos sobre la producción de cultivos de cuatro provincias: Punjab, Sindh, Provincia de la Frontera Norte-Oeste y Balochistan, durante el período de 1980/81 a 2005/06, para examinar las diferencias inter-provinciales en los índices de crecimiento de la productividad. Se plantean y examinan propuestas para explicar el mayor rendimiento de la productividad de los productores de cultivos Punjabi con respecto a los de Sindh y la Provincia de la Frontera Norte-Oeste, y las inusuales tendencias de la productividad de Balochistan. Los factores principales se relacionan con la infraestructura económica y el capital humano. El impacto de la investigación agrícola es difícil de discernir, y se requiere más trabajo para evaluar los efectos retrasados de los gastos de investigación en el crecimiento TFP.      

西部外贸中小企业发展的战略选择

中小企业是西部地区外贸进出口的重要力量。据统计，2005年，西部地区中小企业的进出口额达156．03亿美元，占西部地区进出口总额的34．6％，同比增长37．5％，表现出强劲的发展势头，成为推动西部地区对外贸易发展的一支最具活力的力量。然而，与东部地区同类企业发展相比，由于受区域经济发展水平、思想观念、经营环境以及政策等多种因素的影响和制约，西部外贸中小企业的发展还明显滞后。     

Trends in multiculturalism in health care

Materiel managers are faced with a shrinking world and changing work environment. The needs and expectations of the customer have shifted because of the increasing number of multicultural groups. These groups will continue to assert their right to culturally sensitive care. Materiel managers also need to learn to support and enhance the skills of a multicultural work force. One important tool for change will be technology. However, technology that brings the world closer together also creates new challenges for managers, who will have to deal with multicultural colleagues, buyers, sellers, and manufacturers of goods and services.     

Errors in variables in panel data

Panel data based studies in econometrics use the analysis of covariance approach to control for various ‘individual effects’ by estimating coefficients from the ‘within’ dimension of the data. Often, however, the results are unsatisfactory, with ‘too low’ and insignificant coefficients. Errors of measurement in the independent variables whose relative importance gets magnified in the within dimension are then blamed for this outcome.Errors-in-variables models have not been used widely, in part because they seem to require extraneous information to be identified. We show how a variety of errors-in-variables models may be identifiable and estimable in panel data without the use of external instruments and apply it to a relatively simple but not uninteresting case: the estimation of ‘labor demand’ relationships, also known as the ‘short-run increasing returns to scale’ puzzle.     

Mediation in industrial disputes in Britain

This article presents an overview of mediation in industrial disputes, and examines the British experience of using this form of third-party intervention since the establishment of the Advisory, Conciliation and Arbitration Service in 1974. The Author concludes that there is scope for the development of mediation in dealing with particular types of industrial disputes.     

我国审计的未来展望

我国审计未来的格局将会由现行的国家审计、内部审计和社会审计"三足鼎立"的局面转变为社会审计"一支独大"、其他两种审计模式趋弱的局面;审计的重心将是舞弊审计、绩效审计、环境审计和财务审计;国家审计、内部审计和社会审计的行为主体模式将分别是立法型、审计委员会负责型和民间型.