共查询到20条相似文献,搜索用时 62 毫秒
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李庆钢 《安全.健康和环境》2004,4(12):44
每天的17:30分,我们乘坐的班车在下班号响后会准时驶出厂门,出了厂门的右侧有个站,这儿是机关干部的上车点. 由于班车从我们车间始发,近水楼台先得月,我便有了固定的座位,一个位于车尾,靠窗的单座.而每天经过厂门口停站时,总会上来一个人,站在我边上,伸出一只毛茸茸的手抓住扶手.从那一身将校呢的制服上,我了解到他是厂武装部长,姓王,今年初刚转业到我们厂工作. 相似文献
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马亚伟 《辽宁城乡环境科技》2014,(1):27-27
正春天不远了,浓浓的年味中,温馨和喜庆的气息弥漫着,让人觉得暖意融融。春,就在前方招手。时光飞逝,又一季春回。岁岁年年,不变的是起点与终点之间的距离;年年岁岁,改变的是沿途的风光和我们已不再青春的容颜。不经意间,走过了山一程,水一程。等待我们的是旧年帷幕的悄然降落,是新年旅程的响亮鸣笛。 相似文献
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一、认清形势,增强做好环境保护工作的紧迫性和责任感 过去的一年,在各级党委、政府的正确领导和大力支持下,通过各级环保部门的积极努力,我区环境质量总体保持稳定,重点城市、重点区域和流域的环境质量有所好转,生态环境恶化的趋势初步得到遏制,环境保护工作取得明显进展.这些成绩是在自治区经济快速发展当中,资源、能源消耗较大的情况下取得的,困难多、难度大,成绩来之不易.借此机会,我代表自治区人民政府向辛勤工作在全区环保战线上的广大干部职工表示衷心的感谢和亲切的问候. 相似文献
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近些年来,随着工企业的不断增多和经济的迅猛发展,环境的污染问题越来越受到人们的重视和关注,在这种情况下,导致了各种洁净性型煤的应运而生.那么,通过型煤与原煤燃烧的对比试验,对它的燃烧特性进行了测试,证明燃烧型煤可降低烟尘和SO2的排放,并提高炉膛的温度. 相似文献
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在二十世纪里,对于美国而言,最有影响力的发明莫过于汽车了,汽车载着美国人民的幢憬,使整个国家的发展日新月异,助其驶向世界,成就霸业。时至今日,汽车在美国仍然扮演着超级发动机的作用,不断加快其前进的速度,不仅提升生产和生活效率,还解决就业,贡献产值。 相似文献
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干旱季节水库水质pH值增高原因探析 总被引:3,自引:0,他引:3
随着水库蓄水量的减少,水生生物快速大量生长,破坏了水体中碳酸氢盐的水解平衡,伴随生物利用水中二氧化碳进行光合作用的过程,水中氢氧根离子含量增加,氢氧根离子又使碳酸氢根的电离平衡向生成碳酸根离子方向移动,导致水中碳酸根离子浓度增大,总碱度增加,同时湖库底质盐碱土和草甸土的碳酸氢盐以及碳酸盐的平衡释放也使水体的碳酸氢盐得到外源补充.周而复始使水体的碳酸盐碱度和总碱度不断增加,pH也逐步增高.在相对往年引入嫩江水容量较少的情况下,干旱、高温、少雨、水体表面的物理蒸发和生物蒸腾作用,水库水容量急剧减少,上述情况进一步加剧.并通过对水库出口的碱度进行修正,推算出水体的生物量,和理论生物量计算值相符合. 相似文献
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中国和印度几乎同时出现在世界舞台表明国际事务的架构发生了史无前例的变化.这两个占世界人口40%的巨人,其人口相当于位居其后的20个人口最多国家的人口总和.在十九和二十世纪,这两个巨人长期在主宰国际事务的欧洲、日本和美国的阴影之下沉睡. 相似文献
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HOCKETT CF 《American scientist》1948,36(4):558-572
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<正>位于利马气候大会会场F区附近的一片草坪上,人们常常能看到很多中国人的面孔。每天中午1点多的时候,中国代表团的团员们会陆陆续续来到这里领取盒饭,稀里哗啦地吃完之后,坐在塑料椅子上稍微休息一会儿。12月的利马炎热异常,草坪上的树荫下稍微凉快一点,比帐篷和板房搭起来的办公室要好多了。所以,大会没开始几天,中国角的媒体吹风会就改到了这片草坪上,几张拼起来的折叠桌和一圈塑料椅子就 相似文献
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This paper applies several well-known decision criteria to the climate change problem. The policy process is represented by a simple game against nature with two possible choices: abate or no action. The outcome is considered a compound lottery, with one representing emissions and another representing damages. Assuming that costs exceed benefits of abatement for the participant, the paper analyzes how different decision criteria affect the decision to abate. The role of expert opinion and quality of information in climate change decisions are also considered. The complexity of global warming makes it impossible to completely overlook the consequences of alternative choices. The paper discusses the question of whether the use of less information demanding alternatives to expected utility theory is indicated. It concludes that the choice of criterion is a political question, and that those in favor of abatement policies might be using one of the alternatives as basis for their advice, and suggests that if the possibility of making irreversible mistakes is of great concern, then the minimax regret criterion might have increased relevance. 相似文献
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Investigation on Fe, Mn, Zn, Cu, Pb and Cd fractions in the natural surface coating samples and surficial sediments in the Songhua River, China 总被引:3,自引:0,他引:3
Natural surface coating samples (NSCSs) from the surface of shingles and surficial sediments (SSs) in the Songhua River, China were employed to investigate the relationship between NSCSs and SSs in fractions of heavy metals (Fe, Mn, Zn, Cu, Pb, and Cd) using the modified sequential extraction procedure (MSEP). The results show that the differences between NSCSs and SSs in Fe fi'actions were insignificant and Fe was dominantly present as residual phase (76.22% for NSCSs and 80.88% for SSs) and Fe-oxides phase (20.33% for NSCSs and 16.15% for SSs). Significant variation of Mn distribution patterns between NSCSs and SSs was observed with Mn in NSCSs mainly present in Mn-oxides phase (48.27%) and that in SSs present as residual phase (45.44%). Zn, Cu, Pb and Cd were found dominantly in residual fractions (〉48%), and next in solid oxides/hydroxides for Zn, Pb and Cd and in easily oxidizable solids/compounds form for Cu, respectively. The heavy metal distribution patterns implied that Fe/Mn oxides both in NSCSs and SSs were more important sinks for binding and adsorption of Zn, Pb and Cd than organic matter (OM), and inversely, higher affinity of Cu to OM than Fe/Mn oxides in NSCSs and SSs was obtained. Meanwhile, it was found that the distributions of heavy metals in NSCSs and SSs were similar to each other and the pseudo-total concentrations of Zn, Cu, Pb and Cd in NSCSs were greater than those in SSs, highlighting the more importance for NSCSs than SSs in controlling behaviours of heavy metals in aquatic environments. 相似文献
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在旱季,亚马孙河巨龟(Podocnemis
expansa)将巢穴修筑在河槽边缘和内部的广阔沙洲上.这些巢穴在某些沙滩上的某些具体地点的大量聚集表明巢穴位置的选择不是随机的,而是与一些地质状况有关,如沙洲边缘的倾斜度和砂质高台的存在.通向高台顶端的通道或斜坡结构的存在是巢穴位置选择的决定性因素.被侵蚀的以及陡峭的沙滩边缘阻碍了亚马孙河龟到达最理想的筑巢位置.随着时间的推移,沙滩形态的变化会改变巢穴的分布. 相似文献