大断面煤巷掘进机的研制

本文介绍了采掘装备的发展现状,阐述了大断面煤巷掘进机的主要组成部分及结构特点,对主要元部件截割头、装载机构、回转机构、履带行走机构进行了设计。并对整机进行了地面试验,表明该机截割能力强、稳定性好、性能可靠,对改善我国特厚煤层综放开采采掘比例失调,促进我国综掘机械化发展具有极其重要的作用。     

关于大量程超声波料位计的算法修正讨论

随着现代科学技术的不断提升,煤矿、铁矿、造纸、稀土等行业的自动化水平取得飞速发展,能否稳定、准确、智能地测量料位决定着这些行业是否能够向现代化、智能化发展。测量料位的方法有很多,其中超声波料位计采用非接触方式,能够有效避免光线、粉尘、烟雾和电磁干扰的影响。研究和设计精度高、稳定性好、性价比高的超声波料位计是充满挑战性和具有现实意义的课题。考虑到超声波的传播速度受温度的影响较大,推导出带有温度补偿的速度修正计算公式,并应用在软件算法中;为了进一步提高测量精度,本文还详细分析了超声波传播的实际路径并给出了计算公式。     

Economic Effect of Zoning Regulations on Korea's Small and Medium‐Sized Retailers*

In this paper, we investigated the economic effects of zoning regulations on the retail industry in Korea. We estimated the changes in the number of sales for retail stores using a panel regression analysis for stores in traditional markets. This analysis was conducted to examine the benefit of zoning regulations on retail stores. Our results show that the zoning regulations (called Traditional Commercial Activity Protection Zones) have contributed to an improvement in the actual business performance of small independent retailers. We found that the amount of sales for each store clearly increased on average in the areas designated as Traditional Commercial Activity Protection Zones where there was no market entry of mega supermarket chains (called SSM in Korea). We also present evidence that the effects of this policy differ geographically: the effects were stronger for small and medium cities than for large metropolitan cities. These results suggest that zoning regulations enacted by the government to protect traditional markets and small retailers should also consider regional differences when assessing policy effectiveness.     

石油化工施工中大型设备吊装的管理分析

在石油化工项目的建设过程中,必须要加强大型设备吊装管理。本文首先阐述了吊装工艺,而后提出了几点管理措施,以供借鉴和参考。     

浅谈中大型企业信息化监理的必要性

从中大型企业信息化建设的角度,结合信息化建设项目的特点,研究了信息化监理在中大型中大型信息化建设过程的重要作用及意义。     

大型互联网平台扼杀式并购规制的完善与变革

互联网平台发展壮大的同时垄断问题也引起全世界反垄断执法机构的关注。尽管《反垄断法》的修订回应了公众对数字领域垄断问题的部分关切,但传统事先申报标准无法满足互联网平台反垄断执法需求,且实质性审查制度在新业态下陷入失灵,大量大型平台企业并购初创企业案件长期逃脱反垄断审查。为此,可以通过修正申报标准、完善相关市场界定、重塑反竞争评估、优先适用行为性限制条件以及构建长效监管机制来规制扼杀式并购行为。     

西北大温差地区钢管混凝土构件温度场及脱粘分析

为研究西北大温差条件下钢管混凝土构件截面温度场变化规律及钢管与核心混凝土界面脱粘情况,选取新疆乌鲁木齐市和青海西宁市典型日平均大气温度,通过温度冲击循环环境模拟试验方法分为12个时间段在大气模拟箱分别进行素混凝土、钢管混凝土构件温度场和钢管混凝土构件脱粘测试试验,分析西北大温差环境钢管混凝土温度场变化和界面结合状态。结果表明：钢管混凝土构件在大温差反复作用下,因材料差异产生的不同步热胀会使钢管与核心混凝土发生界面脱粘现象,温差越大越明显;同一个系列上径向温度变化中,随直径缩小,温度变化越滞后;当大气温度骤降时,钢管对核心混凝土会产生套箍作用,且温度越低,钢管的套箍作用越强。     

Consumer satisfaction in retail stores: theory and implications

The substitution of small retail stores by the large stores has been a topic of debate among academics, practitioners, retailers and general public, especially in the context of foreign firms entering emerging markets such as China and India. The purpose of this research is to find out the determinants of consumer satisfaction in small and large retail stores in an emerging market, with a sample from India. Data were collected using a 39‐item structured questionnaire developed by the authors. The sample consists of 225 consumers who shop at retail outlets (Convenience sample of 125 consumers from small and 100 consumers from large stores respectively). Exploratory factor analysis grouped the 39 variables into 14 factors. Further, regression analysis revealed that six of the factors (Social desirability, staff friendliness, shopping economy, shopping ambience, family shopping and deal proneness) were major predictors of consumer satisfaction as they were found to be significant at 5% level. The significance of factors such as social desirability and staff friendliness imply that many consumers prefer those typical features of small stores, which in turn results in the likely coexistence of small retail formats in spite of the entry and proliferation of large retail stores from different countries. We posit three theoretical propositions to stimulate further research in this area.     

Government Policies and Private Enterprise Development in China： 2003-2006

The relationship between government policy and economic development has been a long- standing topic of academic research andpolicy debate. The government of a transitional economy plays an important role in the process of economic development. Over the past three decades, the Chinese economy has been growing very rapidly, in particular because of the rapid development of the private sector. However, the performance of private enterprises is still affected by government policies. In the present paper, we examine the changes in large Chinese private enterprises performance during 2003-2006 and test the determinants of such changes. We conclude that the Chinese Government＇s discriminating policies against private enterprises are the main cause of the private sector＇s downturn.     

大型外资超市滥用市场优势地位的法律规制

针对大型外资超市滥用市场优势地位越来越严重的情况,近年来我国采取了积极的规制措施,并主要集中于法律规制、行政规制,而地方政府的规制以及行业规制起到了补充作用。但是,大型外资超市依然以各种方式滥用市场优势地位,零供矛盾没有得到彻底解决。为了增强规制效果,建议增强《反垄断法》的可操作性,完善《反不正当竞争法》,制定统一的《零售商供应商公平交易法》,发挥行业协会等非政府组织的积极作用。