超细全尾砂连续充填工艺技术的研究与开发

冬瓜山铜矿采用阶段空场嗣后充填采矿法,设计生产能力13000t/d,充填能力3850m3/d,年需充填量120万立方。矿块分二步骤回采,即先采矿房,后采矿柱,为控制地压活动,采用隔三采一和隔一采一的采矿顺序。在矿石中有25%的难选矿石,为提高选矿回收率因此矿石粒级细且尾砂含硫较高,若用分级尾砂充填矿山充填材料缺口很大,同时在充填料浆中含有一定的有害气体。因此采用全尾砂高浓度连续充填和选择适宜的高强度充填胶结材料是冬瓜山铜矿实现安全文明生产,保证矿山生产能力的前提。     

直读式粉尘浓度测量仪示值误差的测量不确定度评定

通过粉尘测量仪表检定装置对直读式粉尘浓度测量仪示值误差进行不确度评定。     

Industry concentration in common value auctions: theory and evidence

We examine theoretically and experimentally two countervailing effects of industry concentration in common value auctions. Greater concentration of information among fewer bidders reduces competition but increases the precision of private estimates. We demonstrate that this generally leads to more aggressive bidding. However, the reduction in competition dominates the informational effects, resulting in lower prices. We examine these hypothesized effects experimentally by conducting a series of auctions with constant informational content but distributed among a varying number of bidders. The experimental results are consistent with our theoretical predictions. The authors would like to thank Octavian Carare, Eric Friedman, Luke Froeb, Ron Harstad, Toshi Iizuka, Mike Rothkopf, Charles Thomas, and two anonymous referees, for many useful comments and suggestions.     

上市公司供应链集成度聚类分析

主要客户和主要供应商交易比例这两项年度报告指标分别反映了上市公司销售供应链和采购供应链的集成度,通过聚类法可分析上市公司供应链集成度的高低。聚类结果和相关案例表明,少数上市公司有较高供应链集成度并达到较高的供应链管理水平,但多数上市公司供应链集成度仍然较低。     

Ownership concentration and corporate governance practices: substitution or expropriation effects?

The objective of this study is to analyze the relation between ownership concentration and corporate governance practices of a group of Canadian companies listed on the Toronto Stock Exchange. We rely on the corporate governance index developed by the Report on Business (ROB) in 2002. Our empirical results are consistent with the expropriation effect argument that predicts a negative relation between deviation from the one share‐one vote rule and corporate governance best practices. In this context, the dominant shareholder has incentives to maintain weak internal controls in order to facilitate expropriation. In addition, consistent with prior research, our results give partial support to the substitution effect argument by showing a negative impact of ownership concentration on the board composition subindex. Copyright © 2007 ASAC. Published by John Wiley & Sons, Ltd.     

Industry concentration,excess returns and innovation in Australia

This paper examines market concentration and stock returns on the Australian Securities Exchange. We find that dominant companies operating in concentrated industries in Australia are able to generate significant risk‐adjusted excess stock returns. Our results for Australian data are opposite to that found by Hou and Robinson (2006) for United States market data. Hou and Robinson reason that United States firms which operate in concentrated industries are insulated from competitive pressures, have lower levels of innovation (Arrow, 1962) and therefore experience lower profitability and stock returns. By contrast, the Australian data show a significant and positive relationship between concentration and innovation expenditure. Therefore, the excess stock returns of dominant companies in Australia are consistent with previous research linking innovation expenditure with excess stock returns. We hypothesize that the apparent contradiction of our results compared with Hou and Robinson (2006) for the United States market is resolved by an examination of the differences in size and competition in United States and Australian industries and the consequent differential ability of dominant companies in the two countries to generate monopoly rents and invest in ‘Schumpeterian’ (Schumpeter, 1942) innovation.     

Price Rigidity and Industrial Concentration: Evidence from the Indonesian Food and Beverages Industry

This paper investigates the relationship between industrial concentration and price rigidity in the Indonesian food and beverages industry. A Cournot model of firm behavior is used in which prices adjust according to a partial adjustment mechanism. The model is applied to panel data of the Indonesian food and beverages industry over the period 1995–2006. The results suggest that industrial concentration has a positive effect on percentage price changes. Furthermore, the speed of price adjustment is higher when the per unit cost of production rises.     

流通垄断的福利经济学分析及其测度

本文主要考察流通垄断的特殊性及其福利经济学测度。流通垄断与生产垄断相比，其垄断行为和垄断结构具有很多特殊性和复杂性。在目前阶段，流通市场的低集中度是制约我国流通产业发展的一个重要原因，大型流通企业之间的合并和重组一方面可以实现流通的规模经济，另一方面又有可能导致垄断程度的提高，本文通过一个简单的流通企业合并模型，从福利经济学的视角探讨了这种合并的两难效应，并进一步分析了此种情形下的反垄断措施。     

Invariances and Diversities in the Patterns of Industrial Evolution: Some Evidence from Italian Manufacturing Industries

This work explores and compares some basic properties of corporate growth process at both aggregate manufacturing level and disaggregated sectoral levels. Using an extensive dataset on Italian manufacturing firms, we investigate which properties of firm growth dynamics are robust under disaggregation. We compare the results obtained with three different definitions of firm size, namely total sales, number of employees and value added. Our analysis suggests that while different sectors are characterized by significant differences in firm size distributions, in the degrees of concentration and in the autoregressive structure of the growth processes, there are also regularities which hold across all of them, such as the approximate unit root nature of the growth process and the power exponential shape of the growth rates density. Together, these “stylized facts” suggest challenging puzzles on the drivers of corporate growth and the resulting industrial structures.     

From reviving tradition to fostering innovation and changing marketing: the evolution of micro-brewing in the UK and US, 1980–2012

Abstract

The purpose of this article is to explore and examine the impressive growth of small and micro-breweries registered in the UK and US from the early 1980s. While the majority of British and American breweries continue to operate in spatially restricted areas and niche markets, a few businesses expanded significantly in terms of production and turnover, gradually acquiring larger shares of the market and competing with multinational producers at home as well as abroad. The cases of BrewDog and Sierra Nevada, used as case study examples in this article, provide an original account on how once-upon-a-time micro-breweries grew into well established companies by pursuing aggressive strategies in terms of marketing and innovation respectively.