中国沥青、燃料油及润滑油市场月度分析

2009年8月，全国大部分地区进入施工高峰期，沥青终端需求总量较上月出现明显上升。分区域来看，华东和华南地区在项目需求的支撑下，终端需求大量释放，炼厂出货顺畅；西南地区随着灾后重建项目工程的逐步增多，市场交投气氛也日益活跃；北方市场除河北和山西需求相对较好外，其他市场如西北、东北和山东等，需求均小于预期，市场供需基本平衡。     

Market penetration by entry-exit dynamics

A generic characterization of the dynamics of market penetration by technological artifacts is here formulated on the basis of entry rate and exit rate considerations. It is shown that low-order reductions lead to the biologically based logistic dynamic, which—by empirical fit—has been found to be in very good agreement with numerous specific cases. In addition to the derivational justification of the logistic for artifact market penetration, we find that but a small number of parameters are involved in these autonomous characterizations suggesting therefore that market penetration may well be reduced to a similarly small number of dominant operative processes. Some nonautonomous extensions are also discussed.     

岩溶山地土地整理模式研究

西南岩溶山地是典型的脆弱生态环境,与经济发达地区相比,有其自身的土地资源特点、生态特点和社会特点。文章以此为基础,提出岩溶山地土地整理的原则、思路,认为岩溶山地的土地整理应从高标准基本农田建设、阶梯式还林退耕和辐射式生态重建、实行土地双轨制、直接对农户投资着手等,提出不同空间尺度如县市、乡镇、村组、农户土地整理的具体模式。非耕地资源开发是岩溶山地土地整理的重点。     

拜泉县农业持续发展的生态经济系统分析

通过对黑龙江拜泉县农业生态经济系统进行以能流分析、物流分析和价值流分析为主要内容的系统诊断,提出该县通过生态经济综合建设,实现农业持续发展的方向与对策,并证明它是促进农村经济持续发展的一种有效方法。     

永康市副中心城镇绿色空间系统规划探索

城市绿色空间系统规划是城市规划的重要方面,也与城市形象息息相关。文章以浙江省永康市副中心城镇为例,探讨城镇密集地区绿色空间系统规划的内容及方法,主要包括城镇污染综合防治、总体布局及景观规划三个方面的内容。     

Urbanization: the challenge for the next century

This article summarizes a new 1996-97 report from the World Resources Institute, the UN Environmental Program, the UN Development Program, and the World Bank, which describes a future with increased levels of urbanization that were reshaping the physical and social environment. Urbanization increased economic growth and environmental degradation. By the year 2000, 50% of the world population will live in urban areas. Cities are the center of economic activity. Consumption is the highest in cities. Cities produce the most pollution and waste. Three issues are particularly crucial to survival: the water supply, sanitation, and water resource management. Neglect of these and other environmental issues is likely to have important consequences in both developing and developed countries. The greatest growth in urban areas is occurring in developing countries. Cities in developing countries have huge populations living in poverty. The poor in either rural or urban areas are confronted with lack of access to clean water, to sanitation, and to housing. There is overcrowding and exposure to industrial wastes and air pollution. There is a need for policy reform, stronger institutions, and enlightened political leadership. Cities need to improve their environment and to strengthen local government and implement poverty reduction programs. Reform of urban policies must be accompanied by effective urban governance. Community-based approaches are essential. Broad-based support is needed for changes in strategies and practices and for attainment of a more sustainable environment.     

The evolution of the monetary transmission channels in Turkey: evidence from a TVP-VAR model

This article investigates the evolution of the monetary transmission mechanisms in Turkey for the period from January 1986 to December 2016. To this aim, the impacts of monetary variables on the prices and economic activity are investigated with a time-varying vector autoregressive model based on. The evidences from the time-varying responses indicate that the adoption of inflation targeting policy has markedly affected the functioning of transmission channels. The results also suggest that local and global financial crises may magnify the impact of monetary policy shocks on the overall economy.     

《天然气利用政策(2012)》解读

2012年10月31日,国家发改委发布了《天然气利用政策(2012)》,对《天然气利用政策(2007)》进行了修订。《天然气利用政策(2012)》反映了国家对天然气发展的政策导向,主要体现在:1)鼓励天然气发展,明确提出了"提高天然气在一次能源消费结构中的比重";2)绝大部分天然气发电项目由允许类、限制类调整为优先类、允许类;3)放宽工业燃料中天然气的置换领域,以改善环境、促进节能减排。建议国家应落实好天然气发电等配套政策,加快并鼓励天然气管网、地下储气库等基础设施建设,并尽快出台新的天然气价格形成机制。     

两种自适应杂波抑制技术的比较：AMTI及ADPCA技术性能的分析和比较

本文在讨论机载雷达地面杂波回波的基础上，分析了ＡＭＴＩ和ＡＤＰＣＡ系统的性能。对这两个系统从原理上，并利用计算机模拟结果及实验结果进行了比较。本文将有助于工程实现。     

国有企业惩防体系在经营管理中的应用

把惩防体系植于企业内部控制和风险管理制度之内,融入企业经营管理体系之中是新时期、新形势下国有企业惩防体系建设的方向。文章对国有企业惩防体系的内涵、实施途径,以及取得的成效进行初步探讨。