whittle软件境界优化设计的理念与技术方法

介绍了国外设计咨询公司处理矿石损失贫化及构建采矿模型的理念与方法,并对whittle软件优化境界的概念及技术进行了详细论证。     

Self‐employment and local economic performance: Evidence from US counties*

This study explores the relationship between self‐employment and income growth, employment growth, and change in poverty in metro and non‐metro areas in the United States using county‐level panel data. We investigate the impact of the relative size of the self‐employment sector measured by the share of non‐farm proprietorships (NFPs) in total full and part‐time employment on three key economic performance indicators. We first estimate an income growth model to analyse the effects of self‐employment on income growth. Then we investigate the independent effects of self‐employment on employment growth and changes in family poverty rates. Our results indicate that higher self‐employment rates are associated with statistically significant increases over time in income and employment growth, and reductions in poverty rates in non‐metro counties. We find similar effects on metro county income and employment, but not on poverty dynamics.     

Polluting facilities and environmental justice – a study

The environmental justice movement attempts to examine the disproportionate exposure of environmental pollution on minority and low‐income people, understand the patterns of such disproportionate exposures and develop strategies to reduce and eliminate such exposures. Unlike several environmental justice studies that include all fifty states of the United States, this study examines the locations of manufacturing facilities that pollute in states with predominantly high African‐American populations. Our analysis indicates that polluting facilities tend to choose counties with higher proportion of nonwhite populations. Per capita incomes of people living within 5‐miles of the facilities are lower than per capita incomes of people living in the host counties Contrary to the conventional wisdom, population density per square mile both within 1 mile and 5 miles of the facility are much higher than the state population densities.     

Area-specific subsidies and population dynamics: Evidence from the Australian zone tax offset

This paper studies the effect of the zone tax offset (ZTO), a place based income subsidy implemented in rural Australia since 1945. The policy was intended to improve the welfare of inhabitants and provide an incentive for settlement. Our empirical approach exploits the geographical discontinuity in the eligibility for the subsidy to identify its causal effect on population growth. Using data on population by locality from the historical censuses we find that the ZTO had a positive but only temporary effect on population growth in the targeted areas.     

税务筹划及其运用

介绍筹划的概念及其特点．并就企业在组建及以后的投资、筹资、经营活动中，如何应用税务筹划，减轻税负，合法实现纳税利益提出方法和途径。     

矿井提升机闸盘变形修复新工艺

矿井提升机盘式制动系统闸盘偏摆超限,是提升机在使用过程中普遍存在的问题。在实际生产中针对变形严重的提升机闸盘采用"氧-乙炔焰"加热矫正的原理和先进的工艺程序,并制定科学的修复措施,取得了可观的经济效益。     

液压挺柱沉降测试台实时测量

针对液压挺柱配合要求高、间隙检测困难问题,提出一种实时测量方法。采用光栅尺测量沉降位移,PLC采集光栅尺输出脉冲;上位机通过串行通信与PLC进行数据交换,对采集数据进行处理;对上位机实时采集软件进行进程优先级设置。结果表明,该方法能保证测量实时性,可对间隙等间接测量提供参考。     

机房管理的关键

由于学生的好奇和恶作剧,使得机房管理工作非常繁琐,严重影响了机房教学。本文阐述了要管理好一间机房,使其在计算机教学工作中发挥应有的作用,所应该采取的措施。     

论科研单位改制后的管理创新问题

文章介绍了科研单位由事业单位改制为企业后,关键是要从事业单位的运作方式转变为企业运作方式,在观念转变、成果转化、收入分配、人心凝聚方面都必须进行不断改革创新,使科研单位的科技优势、人才优势尽快转化为效益优势、经济优势,从而进一步吸引人才,推动科研事业的发展.     

华北平原地面沉降机理与特点及防治措施

华北平原是世界上超采地下水最严重的地区,也是地面沉降面积最大的地区。通过分析人为因素对华北平原地面沉降的影响,认为目前防治命题的着眼点在于优化开采方案和减少沉降灾害。在全面分析华北平原地面沉降机理与特点的基础上,对华北平原地面沉降防治提出了一套工作思路,并认为开源节流是解决地面沉降的最终措施。