西部大开发中“西气东输”的储量保证与可持续发展

在西部大开发中 ,能源占有举足轻重的作用。我国西部的塔里木、准噶尔、吐 -哈、柴达木、鄂尔多斯、四川等六大含油气盆地含有丰富的天然气资源 ,储量大于 5 0 0× 10 8m3的 9个大气田中 ,西部就占 7个。中国天然气预测资源总量为 38× 10 12 m3,其中西部天然气预测资源量为 2 2 .4× 10 12 m3,占天然气预测资源总量的 5 8.9%。仅就西部的塔里木盆地而言 ,剩余可采储量为 3397× 10 8m3,按年产 12 0× 10 8m3计算 ,储采比为 2 8,塔里木盆地天然气有动态稳产 30年的储量保证 ,这对于“西气东输”工程的实施、西部经济的腾飞和可持续发展具有重要意义     

TOXIC METALS IN SURFACE WATERS FROM COAL ASH1

ABSTRACT: The concentration of 10 [titanium (Ti), manganese (Mn), copper (Cu), chromium (CR), zinc (Zn), arsenic (As), selenium (Se), cobalt (Co), cadmium (Cd), and mercury (Hg)] toxic elements were measured in the water, benthic sediment, plants, invertebrates, and vertebrates of an ash basin and its drainage system at a coal-fired power plant of the Savannah River Project, Aiken, S.C., over a period of two years. During 12 months of this period the basin was essentially filled and little settling of ash occurred. In the remaining 12 months, dredging had been completed, adequate settling occurred and most of the effluent turbidity was removed. All elements were more concentrated in sediment and biota than in water, and five (Mn, Cu, As, Zn, and Se) were biomagnified by at least one biotic component as compared to concentration in benthic sediment. Plants had high accumulations of Ti, Mn, As, and Hg; invertebrates had high accumulations of Co, Hg, Cu, Cr, Cd, and As; and vertebrates greatly biomagnified Se and Zn. The streamlined biotic community of the system accomplished major removal of Mn, Zn, As, Se, and Cd from the effluent. The magnitude of bioaccumulation of Ti, Mn, Zn, As, Se, Cd, and Hg was increased during the period of adequate settling in the basin.     

山脊防火林带有效结构的研究

防火林带的防火性能与阻风性能密切相关。本实验采用风洞模拟方法,对通风结构、疏透结构和紧密结构3种防火林带附近的风速进行测定,绘制了3种结构防火林带迎风面的风廊线。结果表明：紧密结构与疏透结构防火林带附近的阻风性能比较好,而通风结构阻风性能最差;但紧密结构防火林带上方的相对风速高达130％,为飞火的产生创造了条件;疏透结构林带上方的最大相对风速只有110％,不具备飞火产生的条件。所以,山脊防火林带的有效结构为疏透结构。     

Questionable accountability: MSF and Sphere in 2003

This article examines the relationship between Médecins Sans Frontières (MSF) and the Sphere Project. Prior to revisiting the concerns MSF had with the project, it looks at factors that give rise to differences between NGOs and cites some reasons for why an organisation such as MSF would not embrace such a project and clarifies some key elements of MSF-style humanitarianism. The author revisits the original concerns and arguments presented by MSF when it decided not to participate beyond assisting with the establishment of technical standards and key indicators for the handbook. This is followed by a critical discussion examining these concerns and counter-criticism with reference to experiences a few years after the inception of Sphere. It concludes with MSF's perceptions and stance regarding Sphere and accountability in 2003.     

谈"动态对等"的缺陷

美国著名翻译理论家Nida提出的"动态对等"原则是对翻译理论界的一大贡献.笔者在承认这个原则的同时,从它概念的几个关键词入手,指出这个概念中几个值得商榷的地方,认为它的理论基础不牢靠,并分析了它所忽视的翻译所涉及的几个要素,由此表明,翻译这种涉及到许多因素的复杂活动不能依靠一种理论来指导.     

云南宣威群地层路堑边坡滑带土蠕变特性研究

为研究云南宣威群地层路堑边坡滑带土的蠕变特性,采用GDS非饱和反压直剪仪,对边坡滑带土进行直剪蠕变试验,研究该路堑边坡滑带土在不同法向应力下的蠕变特性和长期强度.试验结果表明:该路堑边坡滑带土的绝对蠕变量随水平剪切应力的增加而增加,当水平剪切应力一定时,滑带土的绝对蠕变量与法向应力呈负相关性,而滑带土的瞬时蠕变量随水平...     

立足实际 抓住要害《大气污染防治法》作重要修订

介绍修改《大气污染防治法》的重要意义及修改内容。     

干旱区油田采油污水的处理及综合利用

我国西部干旱地区的塔里木盆地,有许多深居欧亚大陆腹地的大型油田,都地处水资源极其匮乏的地区,在油田的开发过程中的用水量和产水量都比较大,本文就采油过程中产生的采油污水的处理和综合利用问题作了探讨。     

Soil Fertility Quality and Agricultural Sustainable Development in the Black Soil Region of Northeast China

The black soil in northeast China is considered one of the most fertile soils in China. Consequently, the black soil region has become one of the most important regions for cereal grain production in China. Agriculture has developed rapidly since the early part of the nineteenth century. To date, approximately 70 percent of total land in the area is cultivated. Even though the agricultural production in this region is increasing continuously, some soil fertility quality problems have become serious. This is hampering agricultural development and sustainability in the region. A brief history of population growth and agricultural development in the region is presented. Major soil quality problems, particularly soil degradation and soil erosion, are analyzed. Based on studies, suggestions for improving soil quality and for promoting sustainable agricultural development in the region are presented. These suggestions include improving agricultural landscape patterns, developing conservation cultivation, promoting combinations of crop production with combinations of forestry and animal husbandry, and implementing integrated management for soil and water conservation.     

Ecophysiological Responses of Larix sibiricaLedeb. and Pinus sibiricaDu Tour Undergrowth to Climate Change

The effects of probable climate change—an increase in atmospheric CO₂(by two times), air temperature, precipitation—on CO₂exchange and temperature dependence of net photosynthesis in the larch and Siberian stone pine undergrowth formed in the light larch forests of West Siberia were studied in chambers with an artificial climate. The change of the aforementioned ecological factors caused an increase in the temperature optima of photosynthesis and the range of optimum temperatures (in the case of Siberian stone pine, to a slightly greater degree). Therefore, the ranges of both species may broaden, and the Siberian stone pine can expand to the north, displacing larch tree stands.