可门电厂烟气脱硫吸收塔结构计算分析

通过有限元方法,对可门电厂烟气脱硫吸收塔进行结构计算分析。首先得到了塔体的振型、周期等自振特性,然后分析了塔体以及主要构件在各种荷载作用下的应力和变形,最后讨论了吸收塔塔体、构件及设计构造等。文中方法与结果可为类似工程借鉴。     

甘肃敦煌雅丹国家地质公园总体规划

总体规划充分尊重地质演化的自然特征和属性,综合科普教育和旅游观光的要求,进行合理布局.对于未来公园建设中可能出现的不利因素也进行了分析,并提出对策.对于如何发展敦煌的区域旅游提出了合理的建议.     

燃气快速热水器有害物排放及其对厨房环境污染的试验研究

利用燃气快速热水器在不同使用工况下，烟气中有害气体含量及厨房环境测试数据，分析了热水器排放及其对厨房环境的污染情况。通过分析得出结论，提醒人们在使用热水器时应注意的问题。模拟工况有以下几种：厨房空气流通情况下热水器正常使用；厨房空气不流通情况下使用热水器；厨房空气流通情况下，热水器烟道部分堵塞；厨房空气不流通情况下，热水器烟道部分堵塞。     

大学图书馆迷人的砖墙立面

位于东田纳西州州立大学校园中的Charies C.Sherrod图书馆，可供约12000名学生使用。这座占地面积约为54万m^3的建筑物共有四层，如此广阔的空间容纳了超过800000册的藏书，以及私人自习室、计算机室，教师办公室等许多其他的附属设施，在图书馆的这些办公室和附属设施中，     

Role of phosphorus in eutrophication and diffuse source control

Many lakes and some streams and estuaries are showing signs of excessive fertilization due to the input of aquatic plant nutrients from man-associated sources. The key element often found limiting aquatic plant populations is phosphorus. The attempt to control phosphorus input to natural waters as the overall approach for controlling excessive fertilization is technically sound and economically feasible for many natural waters. However, a much better understanding of the relationship between the phosphorus input to a lake and the excessive growths of aquatic plants within the lake must be developed. This development will require a combined biological and chemical approach toward assessing the role of phosphorus in eutrophication for a specific water body. The biological approach will use tissue content, enzymatic and kinetic uptake analysis of phosphorus limitations as well as bioassays of phosphorus availability in order to determine the limiting nutrient for a body of water. The chemical aaproach will utilize amounts of each of the forms of phosphorus present in the lake and the rates of interchange of phosphorus between these various forms.There will be some waters where control of phosphorus from treatment of domestic waste water input and removal of phosphorus from detergents will not result in significant improvement in water quality. This is because these waters derive their phosphorus from diffuse sources, such as urban and rural stormwater drainage, the atmosphere, and ground waters. In these instances, it may be necessary to initiate in-lake control of phosphorus by the addition of alum or iron salts.     

俄罗斯修女院防火

在俄罗斯古城雅罗斯拉夫尔城外数公里处托尔加,在流经该处的伏尔加河左岸,座落着俄罗斯东正教一座历史悠久、别具风格的修道院——圣维京托尔加女子修道院。这座修道院始建于1314年。据史料记载,该院于15世纪初曾经发生一起大火,许多教堂用品、装饰品、圣像、书籍、生活用品等被付之一炬,但圣母玛丽亚的圣象却被修士们在修道院内的小树林中找到,幸而完整无损。若干年后,又多次历经各种劫难,托尔加修道院几经改建、扩建,成为俄罗斯国内最宏伟的修道院之一。1918年十月革命后,该修道院被取缔,在该处设有一所少年劳动教养院,1987年被归还给俄罗…     

浅析防水混凝土基础漏水问题

对造成混凝土蜂窝、孔洞、麻面渗漏水、施工缝漏水、裂缝渗漏水、预埋件部位渗漏水的原因进行了分析,提出相应的预防措施,并对低混凝土的入模温度、浇灌速度、保温保湿养护措施等方面进行了阐述,以保证工程质量。     

表面活性剂存在下金属置换回收硫脲金研究

研究了表面活性剂——金属还原剂体系 ,在硫酸硫脲金 (Au(Tu) +2 )溶液中还原置换金的性质和条件 .实验结果表明 ,表面活性剂对金还原过程有明显的促进作用 ,可使金的置换回收率显著提高 .实验筛选出了 SLS- Al粉还原体系 ,获得了金回收率达 99%满意结果 ,提出了一种在低含量硫脲金溶液中 ,深度置换回收金的方法     

220kV丽江变电所注浆加固地基失败原因探讨

由于注浆加固软土层是挤密、劈裂、渗透的复合过程,因而采用传统、单一的渗透注浆理论来计算与实际情况有较大的偏差.把软土体看作遵循Tresca屈服准则的理想弹塑体,同时结合浆液的柱状扩散情况,利用圆筒形扩张理论来计算浆液扩散半径和注浆压力.并以220kV丽江变电所注浆加固地基为例,分析其注浆失败的原因.     

A Microcomputer Model for Flood Prediction with Applications

Abstract: A generally applicable mathematical model, tailored for use on a Personal Computer, as the design tool to simulate unsteady flood flow in a network of interconnected rivers has been developed and applied to the Sham Chun River along the border between Hong Kong and the People's Republic of China. The effect on the improved Sham Chun River due to the proposed river training in the River Indus, one of its tributaries, is evaluated. The one-dimensional unsteady flow model itself is broadly applicable to a wide range of hydrologic conditions and varying field situations. It incorporates real hydraulic features including branched channels and 'tidal flats' flooding and drying. The time history of water stages and discharges are computed at any desired location throughout the connected essentially one-dimensional channel network subject to initial and boundary conditions. Details are given of techniques adapted in using the computational scheme to quantify the unsteady flow condition and the means to assure an efficient numerical solution as well as to verify the accuracy of the computed outputs by subjection to carefully selected schematic simplified test cases and real prototype cases with numerical solution method is a useful predictive engineering tool in river design.