井田工程地质特征及开采技术条件分析

文章针对井田资源勘查与开发,结合贵州省威宁县格目底煤矿区新寨井田实际情况,首先,对井田工程地质特征进行分析,提出相应的开采技术条件,然后,对松散层、瓦斯、煤尘与地温4个井田开采影响因素进行评价,最后,得出井田总体开采技术条件优越,但瓦斯含量较高,为高沼气井田,需重视瓦斯治理的结论,旨在为井田资源的大规模开采提供可靠的理论依据。     

对黑龙江省嫩江县一四七区煤矿井田可采煤层的技术探讨

通过对一四七煤矿井田资料的综合分析，认为该井田的煤层单一、稳定、标志明显，煤质为低熔点的长焰煤；煤的挥发份产率较高，有害杂质较多等的特点，本井田煤适用于动力和民用煤。开采技术条件也可达到生产需要，只要对井田进行科学规划、合理开发、综合利用，将来对该井田的开发经济效果会越来越好。     

河南省新密煤田翟沟井田地质特征

本文以新密煤田翟沟井田勘探资料为基础,对井田区域构造特征、二1煤层煤质特征、二1煤层水文地质特征、含煤地层沉积特征及沉积环境等进行分析,研究翟沟井田地质特征,为新密煤田二1煤的开发利用提供了方向。     

西固井田断层发育规律探讨

通过对西固井田内的地质资料的收集与研究，分析了西固井田地质构造的成因及牲征，找到了中小型断层预测的方法及途径，为采掘工作面设计、施工提供依据。     

带压开采技术在曙光煤矿的应用

针对曙光煤矿井田的水文地质特征,对井田内主要可采煤层进行了带压开采可行性分析,然后制定了一系列带压开采防治水技术。实践表明,这些技术是可行的,带压开采取得了成功。     

龙永煤田田坑矿区找煤前景初探

文章根据田坑矿区周边的龙潭东井田、北山井田、长塔井田的开采见煤情况,结合地表踏勘,对该矿区的成煤情况进行探讨,为下一步找煤工作打下坚实的基础。     

GPS技术在郑煤集团裴沟矿区控制测量中的应用

介绍裴沟矿D级GPS控制网的建立过程,以级精度评定、误差分析、基线和平差处理、高程拟合,对杨河井田、樊寨井田开发规划及三一、四二风井地面近井点测量、井下贯通测量提供了基础技术保障。     

重复开采地表变形规律的分析与研究

根据山东老矿区某井田开采情况，通过对矿井地表观测资料和巡查记录的整理与分析，求取出了不同区域开采地表移动变形参数，对重复开采后断层、褶曲影响规律进行了对比分析，完善了井田变形规律，不仅丰富了矿井矿岩移成果，又为今后工作面开采提供了宝贵的经验。     

城梁井田可采煤层的测井结果研究

本文对城梁井田的测井过程及使用的工作方法进行了论述,对部分可采煤层进行了对比分析。     

二道岭矿区天荣井田煤层气地面抽采利用可行性探讨

文章论述了天荣井田内的煤层气赋存条件、赋存特征及我国煤层气利用现状,结合国内煤层气利用典型企业的先进技术特点,分析了天荣井田煤层气地面抽采技术和综合利用的可行性。     

Workfare,welfare, agency,and well-being

Workfare programs are state-instituted programs that require able-bodied persons with children of school age who wish to claim welfare payments to participate in job training programs, and, eventually, to enter the work force. The philosophy of workfare is based on the value of work and the goal of self-determination. However, as a mandatory program for welfare recipients, workfare requires of those recipients certain duties which, according to those who challenge workfare, interfere with the freedom to choose what one will do with one's life. Whether some form of workfare will be adopted as part of our national welfare system remains to be seen. What the debate about such a program suggests is that welfare, in itself, by ignoring the necessity of security and education for full human agency, neither satisfies basic needs nor prepares its recipients for any life other than that of dependency. With all its difficulties workfare nevertheless presents an alternative to welfare that, at least in theory, more closely identifies its purpose with the values of our society.     

Externalities, Indivisibility, Nonreplicability, and Agglomeration

In this paper we argue that the impact of external scale economies and diseconomies on city size is not nearly as clear-cut as it is tacitly believed in urban economics. Similarly, city-size distortions are not caused by externalities alone. Indivisibility and nonreplicability, which prevent establishing the “right” number of cities, may represent a source for city-size distortions which can be stronger than the standard resource misallocation resulting from external scale economies and diseconomies. It follows that a direct population dispersion policy is not just an inferior substitute to Pigouvian taxes and subsidies but rather a useful complement.     

企业·产品·人

企业是人,产品也是人,把企业和产品当做人来看,办企业就简单了。人有成长过程,企业也有,产品也有。怎样定位一个企业是好企业产品是好产品,跟怎么定位一个人是好人是一样的。要有思想,有文化,有道德,符合社会进步的需求,企业产品也都是如此。     

Mean, median, mode

Summary This note is an attempt to avoid doing the same search for the third time. It happened twice in my life that I wished to prove that the median is located between mean and mode for certain B -distributions: first in 1953, next in 1976. For arbitrary distributions the result is sometimes referred to as F echner's theorem. Of course it does not hold in general. In order to prove the result for particular distributions one can often use an elegant theorem of T imerding . There is a nice relationship with the standardized third central moment.