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工程机械在冬季使用时,因气候寒冷,易导致内燃机起动困难,冷却水和电解液冻结,零部件磨损加剧,燃油消耗量显著增加,因此,在入冬之前必须采取相应的保护措施,加强维护,确保设备的安全正常使用. 相似文献
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世界文化遗产、流传千古的凝固音乐—布达拉宫,建筑在西藏拉萨市中心的布达拉山上。布达拉,是观音胜地普陀洛迦的梵语译音,意思是持航或航行解脱海岛之舟,表示观音持航以普救众生。布达拉山最早叫红山,有着坎坷的经历,辉煌的历史,公元6世纪,雅砻部落第27代赞普拉脱脱日年赞“居拉萨红山之顶”。公元7世纪之初,松赞干布迁都拉萨,“筑王宫于红山顶居之”。之后,大兴土木,建造偌大的城堡,“高达30围墙,既高且阔,每边一里余”,“城的四面有四道门,各有门楼,每门设岗”,“红宫900,合顶之王宫,共1000间,一切宫檐,以宝为饰,走廊台阁,铃铎泠然。”(… 相似文献
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浙江省嘉兴市余南村位于嘉兴市南部,距嘉兴市区9公里,地处余新镇区之南,北靠余新镇余贤大街,中心村距余新镇区仅6公里,属镇郊村.余南村西临海盐塘,东部设有乍嘉苏高速公路余新出口,水陆交通十分便利.全村区域面积5856平方公里,有耕地3209亩.到2005年底,全村有36个自然村,18个村民小组,860户,总人口2525人.有劳动力1580人,男劳动力760人,女劳动力820人,其中在本村企业就业的有460人,占全村劳动力总数的29.11%,70%的劳动力在村内和镇内就业.全村外来人口2806人,主要在村内企业就业.村内有个体私营企业129家,主要生产五金、塑料,有个体种养大户7户.2005年工农业总产值38973万元,其中,农业产值2695万元,工业产值36103万元,第三产业产值176万元. 相似文献
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本文对动、静态下混凝土坍落度损失的规律进行了研究,并从流变学的角度分析了外加剂对动、静态下混凝土坍落度损失的影响坍落度损失存在差别的原因. 相似文献
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Roles of snow and various forms of ice in the phosphorus cycle of a lake are discussed. It is pointed out that precipitation falling directly onto a lake ice sheet during the winter has a disproportionately large impact on the lake system in the spring. Phosphorus derived from snow incorporated into the ice sheet must be included if accurate estimates of spring phosphorus loading are to be made. Data from Coon Lake, Ontario, Canada are used to illustrate points made. 相似文献
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材料——作为一种终端元素并直接影响着建筑的建造——是建筑师将他的建筑构思付诸实现的关键手段,也是建筑师一直以来所致力研究的对象。本文将通过介绍笔者在哥伦比亚大学就学期间、于Steven Holl所领导的教学组内进行的设计,探讨将材料延伸至设计初期的构思阶段的可能-使材料作为建筑构思形成的催化剂。利用材料在空间、光影和形式等方面给建筑师带来的启示,使建筑设计朝着出乎意料、最终突破常规的方向前进。 相似文献
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过去40年新加坡城市发展的总体特征可以概括为人口,服务和娱东的逐步疏散,以及后期根据概率2性规划修编的要求进行的就业岗位疏散。中心城区作炎城市商业中心和就业中心的地位和作用日益重要从而给交通运输体系带来巨大压力;为了缓解中心城区的交通拥挤状况,规划建设覆盖全岛的交通运输网络,实施严格但不乏创新的交通管制措施成为新加坡政府的必然选择。 相似文献
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随着民主化进程的加速.政府建筑逐渐走向亲民、开放,在柳东新区政府及企业总部办公楼设计中,我们深入思考建筑VS.场地,政府vs.市民vs.企业,行政vs.商业,地上VS.地下的关系,通过建筑化的转译,描绘出全新的开放亲民的政府形象及企业形象。 相似文献
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This study was conducted to examine the effects of chlorine dioxide on dehydrogenase enzymes, protein synthesis, and deoxyribonucleic acid of bacteria in order to elucidate the mode of action of chlorine dioxide. Experiments were carried out in a specially designed unit which permitted sampling for bacterial survivals at time intervals from 5 to 1800 s after the addition of the disinfectant. Bacterial numbers were determined by the pour plate technique. The total dehydrogenase activity of Escherichia coli was determined by the colorimetric estimation of triphenyl formazan, and cell extracts were assayed for their ability to incorporate radioactive phenylalanine into protein. DNA extracted from chlorine dioxide-treated Haemophilus influenzae was tested for its ability to transform competent cells. Partially purified DNA was also exposed to chlorine dioxide and tested for transformability.Experimental results show that total dehydrogenase enzymes were completely inhibited within the first 5 s of reaction even while considerable numbers of bacteria remained viable. Protein synthesis was partially inhibited by chlorine dioxide and the extent of inhibition was found to be proportional to the initial chlorine dioxide dosage. Glutathione did not reverse the effect of chlorine dioxide on bacterial viability, total dehydrogenase activity or protein synthesis. When whole cells of H. influenzae were exposed to chlorine dioxide, the DNA transforming activity was not affected. Similarly, when a partially purified extract of H. influenzae DNA was treated with chlorine dioxide, no inhibition of DNA transformation occurred within the first minute of reaction. Moreover, after a contact time of 5 min or more, a very high chlorine dioxide dose of 20 mg l−1 produced only a slight inhibition of DNA transforming function. Thus, the primary site of action of chlorine dioxide on bacteria must lie elsewhere in the cell other than in the dehydrogenase enzymes, the protein synthesizing complex or DNA, although inhibition of protein synthesis may have a contributory lethal effect. 相似文献
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The analytical procedures for measuring arsenical compounds in water and the toxicological properties of arsenic and its compounds are critically reviewed. Despite recent advances in instrumental procedures, there is a need to improve preparatory methods. It is postulated that many recently published arsenic concentrations are low because organic-bound arsenic was not released. A need has been identified for expanded information regarding arsenic concentrations in water supplies and potable waters. This need is predicated on the fact that many current water-treatment practices do not remove arsenic. 相似文献