Structural Adjustment of Oasis Agriculture in Xinjiang

As a special basic economic region in China, Xinjiang is situated in the arid area in the Northwest China. Oasis agriculture is the basis of the national economy. The development of oasis agriculture helps to accelerate the development of economy, social and environment. After 50 years of practice, from 1949 to 2002, oasis agriculture in Xinjiang enhanced rapidly the scale of agricultural industry and had great changes in its structure. The amount of cultivated area rose from 120.97*102 ha t…     

Study on the characteristics of air particulate from a petrochem ical com plex industrial site in the Southwestern Beijing

At petrochemical complex industrial sites in the southwestern suburb of Beijmg，oil has been the major energy source．The air particulate samples were collected separate!y for 3-4 consecutive days every month．The results showed that there are apparent correlations among monthly changes of weight of extracts，their mutagenicities and concentrations of PAHs．The weights for the day-time samples were higher than those for the night-time．Wights of extracts．revertant numbers．BαP concentration etc．were all lower for the petrochemical complex industrial site(PCIS)than for iron-steel complex site(ISCS)．However，mutagenicities per unit weight of extracts were higher for PCIS than for ISCS．     

矿井水中天然总α放射性的混凝处理技术研究

本文研究了混凝沉淀工艺处理矿井水中天然总α放射性核素铀、镭的技术和条件,通过选择适当的混凝剂、加药量、pH值等条件可将铀的去除率提高到80％左右,使用铀专用混凝剂MHU则可使铀的去除率达到87％。对于镭的去除不能单纯依靠铀混凝剂MHU,尚需添加镭的吸附助剂MHR,则可使镭的去除率提高到80％以上。该工艺的最大优点在于充分利用了煤矿现存的大量矿井水悬浮物处理设施,大大节省了新建工程的投资费用,而且新增加的药剂费用不足0.1元/t水,可在煤矿推广应用。     

生态立市 利在千秋——江苏省常熟市环境优美镇创建纪实

江苏省常熟市是一座具有3000多年历史的文化名城，同时也是一座新兴的港口工业城市。常熟市总面积1142平方公里．户籍人口104万人。在2004年．全市实现地区生产总值565亿元，综合实力位居全国同等城市前列。     

环境也是资源

环境也是资源,这已逐渐被人们所认识。绝大多数环境问题,可以说是资源、能源的浪费。许多排放到环境中的有毒有害物质,如汞、镉、铬、镍、铅、硫化物、石油类等,都是由于在生产过程中没有得到充分合理的利用,因而成了污染物。所谓“用之为宝,弃之是害”就是这个道理。环境保护的任务之一就是要变废为宝,化害为利,使资源、能源合理充分地得到利用,为人类提供尽可能多的物质基     

The effects of land use and its patterns on soil properties in a small catchment of the Loess Plateau

Due to relatively strong human activities in the hilly area of Loess Plateau,the natural vegetation has been destroyed,and landscape pattern based on agricultural land matrix was land use mosaic composing of shrub land,grassland,woolland and orchard.This pattern has an important effect on soil moisture and soil nutrients.The Danangou catchment,a typical small catchment,was selected to study the effects of land use and its patterns on soil moisture and nutrients in this paper.The results are as follows:The comparisons of soil moisture among seven land uses for wet year and dry year were performed:(1)the average of soil moisture content for whole catchment was 12.11% in wet year,while it was 9.37% in dry year;(2)soil moisture among seven land uses was significantly different in dry year,but not in wet year;(3) form wet year to dry year,the profile type of soil moisture changed from decreasing type to fluctuation-type and from fluctuant type to increasing type;(4)the increasing trend in soil moisture from the top to foot of hillslope occurred in simple land use along slope,while complicated distribution of soil moisture was observed in multiple land uses along slope.The relationships between soil nutrients and land uses and landscape positions were analysed:(1)five nutrient contents of soil organic matter(SOM),total N(TN),available N(AN),total P(TP) and available P(AP) in hilly area were lower than that in other areas.SOM content was less than 1%,TN content less than 0.07%,and TP fallow land and cropland,and higher level in soil fertility was found in crop-fruit intercropping land among croplands;(3)soil nutrient distribution and responses to landscape positions were variable depending on slope and the location of land use types.     

工程投标风险控制的技巧

工程投标时，需要根据发包方提供的招标文件来编制标价，严格地说，标价并不是报价，标价只是考虑一般情况所作的内部价格，而缺乏竞争因素。而报价是在标价的基础上，分析了竞争对手状态和发包方愿望后提出的价格。所以，从标价到报价的过程是一个复杂的决策过程。其中除进行必要的盈亏分析和获胜概率分析外，更重要的是制定报价策略，以巧妙的策略战胜对手而夺标，并获得满意的收益。本文将分析这方面的技巧及应用实例。技巧之一：修改设计严格地说，承包方是无权单独修改设计的，这里提出修改设计是指先按原设计作出报价后，再根据本单位…     

Internal circulating fluidized bed incineration system and design algorithm

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实施绿色GDP核算的理论实践及面临的挑战

今年将在北京市、天津市、河北省、辽宁省、浙江省、安徽省、广东省、海南省、重庆市和四川省10个省市启动以环境核算和污染经济损失为调查内容的绿色GDP试点工作。主要包括三方面内容。