Livestock intensification as a climate policy: Lessons from the Brazilian case

Brazil is trying to identify ways to ally economic growth with climate change mitigation. Productivity gains in livestock have been pointed out as a promising alternative to achieve that goal. Thus, this paper analyses the economic impacts of a policy of productivity gains in the Brazilian livestock. Besides, we evaluate if the policy may conciliate agricultural growth and deforestation control, bearing in mind the reduction of greenhouse gas (GHG) emissions from land-use changes. The analysis was carried out through a computable general equilibrium (CGE) model, tailored to represent land-use changes, GHG emissions and removals. Besides, it made progress modeling the heterogeneity of climate, soils, and emissions in inter-regional models with many regions. The results show that productivity gains can effectively “save” land and thus avoid deforestation, especially in the Amazon and Cerrado (savannah) biomes. The policy also may boost the economic growth, spreading it to other regions of Brazil, like Centre-West and North, and increasing income and consumption in those places. However, as a climate policy, focused on the reduction of GHG emissions, the results may be counterproductive. The net amount issued may increase, as a result of the positive stimulus of the policy on the economy, and GHG emissions are directly related to the economic growth.     

基于主成分分析的新疆石油天然气产业竞争力评价

文章从产业分析的视角,结合石油天然气产业自身的特点,构建了一套石油天然气产业竞争力评价指标体系,进而应用主成分分析法对新疆石油天然气产业竞争力进行定量分析,确定其在我国石油天然气产业中的竞争地位以及自身发展中存在的优势和不足。最后,文章对提升新疆石油天然气产业竞争力提出相应的对策：延伸产业链,推动上下游一体化发展;依托资源优势,培育和发展相关产业;增强技术创新能力,加快科研成果产业化。     

The Swedish Salt Market during the Great Northern War

Abstract

The purpose of this article is to examine the effects of the great naval blockade on the Swedish salt market during the Great Northern War (1700–1721). Whether or not salt can be perceived as a strategic good subject of wartime shortage is important in interpreting the reasons behind the famous Swedish Navigation Act of 1724. New research claims that the Navigation Act was a welfare enhancing institution, as it helped to secure salt imports. This essay shows that although Sweden was at war with most European Great Powers and the subject of sea blockades during the Great Northern War, the salt market still worked remarkably well. Neither supply nor salt movements show any signs of a great crisis. Thus, there was no need to secure salt imports during the period of peace that followed. Consequently, the Swedish Navigation Act had little to do with welfare but more with rent seeking and monopolies on the freight market.     

清镇煤矿煤炭自燃标志性气体的实验研究

通过对清镇煤矿工作面采空区煤样的氧化热解模拟实验,绘制了各氧化热解气体二氧化碳、氧气、丙烷和一氧化碳等气体浓度随温度的变化曲线,分析找出该矿煤炭自燃的标志性气体指标,为掌握工作面采空区煤炭自燃的规律和制定有效合理的煤炭自燃发火的防治措施提供依据。     

国土资源数据整理入库方案设计

提出一种基于国土资源数据入库的方式,包括它的设计技术路线,整理方式以及涉及到的格式的转换,并在此基础上,探讨国土资源数据整理入库的设计思想。期望能够实现国土资源数据得到更进一步快速有效的管理。     

天然气流量计量现状与发展

天然气流量计量是天然气生产、输送和销售的关键环节，从分析发展天然气计量技术的意义角度出发，介绍了天然气流量计量技术现状，包括：计量标准、孔板流量计、涡轮流量计、超声波流量计以及其它新型的天然气计量仪表。并结合我国天然气工业发展的需要．对天然气流量计量技术的发展趋势进行了预测。     

天然气制合成气技术进展

对目前天然气制备合成气主要的水蒸气转化法、二氧化碳转化法、催化部分氧化法、非催化部分氧化法、自热式转化法进行了综述,并对这些方法的技术特点和工艺操作进行了讨论。     

硫氰酸根的衍生气相色谱分析进展

对近２０ 年来硫氰酸根的衍生气相色谱分析方法进行了评述。介绍了４ 种衍生方法。     

多气源掺混作为城市燃气过渡气源在实际中的应用

为了解决青岛市煤气供需不平衡的矛盾,为引进天然气作好前期准备,我公司将多种气源(焦炉煤气、焦炉烟道气、空气、全水煤气、半水煤气、液化石油气、石化厂净化干气)均匀掺混,掺混后的煤气热值控制在15 675～17000 kJ/m3(适合青岛市燃具),含氧量不大于4.0%.通过实际应用,多气源掺混供气,满足了供气需要,可以作为过渡气源满足城市燃气转换成天然气的需要.     

扬子石化利用尾气提纯氢气的经济可行性分析

扬子石化公司对氢气的需求量不断增加，拟建一套利用尾气提纯氢气的装置来填补缺口，为此对扬子石化公司利用尾气提纯项目进行成本，盈利能力及不确定性分析，研究项目的经济可行性。