铜模浇铸阳极铜脱模剂的应用

介绍了阳极铜浇铸工艺中硫酸钡脱模剂的使用现状,在此基础上研究了粒度、添加物以及水分对脱模剂使用的影响,通过生产实验得到了脱模剂的优化条件:添加10%B2O3、40%Si O2、5%Al2O3、5%Ca O,添加物粒度150-200在目的范围,铜模预热温度200℃-220℃;提出了一种改善脱模剂使用效果的研究路线。     

基于土地伦理的南京市土地资源价值测算

我国处于经济快速发展时期,对土地资源的利用,呈现出以追求经济效益为唯一目标的趋势。只有基于土地伦理观,重视土地资源生态价值,才能改变当前土地污染严重,土地利用结构不合理的现象。本文采用成果参照法、市场价值法、分解求和法对南京市土地资源生态、经济、社会价值进行测算,得到南京市土地资源综合价值。     

运用代理技术共享校园网络信息资源

学校每年都会投入大量的财力提供教学、科研相关的信息服务。但基于一些资源和信息的保密性,以及版权等问题,学校无法直接免费对外网用户提供服务。通过运用代理技术,可以为外网用户共享校园网络信息资源。     

隆化县水土保持宣传实践与探索

本文首先介绍了隆化县水土保持法制宣传取得的成效,分析了隆化县水土保持宣传工作中存在的问题,最后针对隆化县水土保持宣传教育工作提出了一些思考。     

水文水资源环境管理与防洪减灾

水文水资源的调查在我国已经有了长远的发展,但是由于技术和管理水平有限,我国水文水资源环境管理和防洪减灾依然存在较大的问题,本文重点对此类问题进行了详细的分析,供相关人员参考。     

珠三角潮感区排涝泵站规模选取

随着珠三角地区经济的高速发展,涝区越来越淹不得,迫切需要提高排涝标准,而设置排涝泵站是主要措施之一。在实践中,业界主要通过平均排除法、洪峰流量法以及河道调蓄法来确定泵站规模。笔者通过对里水涝区的分析研究,初步提出考虑闸站联排模式的计算方法,继而结合雨峰与洪峰遭遇分析最终确定以河道调蓄方法计算珠三角潮感区排涝泵站的规模,通过实践验证,这种方法是合理可行的。     

武汉二七长江大桥跨武九铁路立交桥施工技术与安全控制

武汉二七长江大桥武昌岸引桥上跨武九铁路,桥式布置为(45+60+45)m三跨变高度预应力混凝土连续梁桥,连续梁S2号主墩毗邻既有线,挂篮需跨越既有线上空施工,安全风险高、施工控制难度大。针对重大安全风险,采取施工天窗封锁要点计划,制定钻孔桩塌孔、挂篮坠落、物体打击、0号块支架拆除应对措施,保证了该桥安全、优质、按期完成,确保了施工过程既有线安全运营。     

ECONOMIC IMPLICATIONS OF POLICY RESTRICTIONS ON WATER WITHDRAWALS FROM SURFACE AND UNDERGROUND SOURCES

The appropriation of water for economic activities is limited by regional surface and underground endowments, and symptoms of environmentally unsustainable withdrawals are already visible in many regions of the world. In this paper we investigate the economic implications of water policy imposing source- and region-specific restrictions on water withdrawals taking the Mexican economy as a case study. We use an inter-regional input–output model of Mexico's hydro-economic regions to allocate production subject to the availability of water and other factors of production. Water sustainability requires a reduction of 7.5?km³/yr of groundwater withdrawals, which is compensated by an increase of 3.4?km³/yr of surface water, an expansion onto an additional 1.4 million hectares of rainfed land, and modifications in subnational patterns of food trade. This framework for evaluating scenarios describing sustainability-oriented water policies is readily applicable to other regions.     

The relationship between agricultural commodity prices,crude oil prices and US dollar exchange rates: a panel VAR approach and causality analysis

This study examines the relationship between crude oil prices, US dollar exchange rates and 30 selected international agricultural prices and five international fertilizer prices in a panel framework. The study uses panel VAR methods and Granger causality tests on panel data sets of agricultural commodity prices (as well as specific agricultural commodity sub-groups) and fertilizer prices with monthly observations of the period from June 1983 to June 2013. The empirical results of the present study indicate that crude oil prices as well as US dollar exchange rates affect international agricultural commodity and fertilizer prices. Furthermore, contrary to the findings of several studies in the literature, the present study supports bidirectional panel causality effects between crude oil prices and international agricultural prices as well as between US exchange rates and international agricultural prices.     

基于广义DEA方法的矿产资源开发利用效率研究

为了矿产资源开发利用效率的提高,应该针对不同区域的特点采取有针对性的政策.借鉴广义DEA方法使用样本单元为参照标准对决策单元的效率进行评价的手段,对河北省各地市矿业开发利用效率进行分析.并在此基础上进行效率排序,为有针对性的矿业开发政策提供参考.