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Bangladesh, situated on the delta of the Ganges, the Brahmaputra, and the Meghna rivers, experiences two distinct types of inundations: (a) river floods resulting from excessive runoff contributed by monsoon precipitation and (b) coastal floods induced by storm surges of tropical cyclones. The river floods are normal annual events and human settlements and agricultural practices have adapted admirably well to their regimes. Abnormal floods that occur once in every few years cause serious damage to crops and properties. To minimize flood losses, a number of modern engineering projects have been constructed within Bangladesh. However, the successful solution of the problem would probably require some international collaboration for basinwide unified systems planning, since large parts of the drainage basins of Bangladesh lie beyond its borders. In the absence of such collaboration, internal resources should be utilized for the construction of smaller public projects, such aspolders, and for encouraging and reinforcing various types of indigenous adjustments to floods. There are very few successful indigenous adjustments to coastal floods. Most of the structural solutions, such as community shelters and higher embankments, are expensive public projects that are probably beyond the means of the internal resources of the country. 相似文献
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Six biochemical parameters and four enzyme activities were determined from the serum of 76 healthy and 56 pathological human fetuses between the 20th and 38th week of pregnancy. In the normal fetuses studied within that period, creatinine, immunoglobulin M, lactate dehydrogenase, and gamma-glutamyltransferase increased; haemoglobin F and glucose progressively decreased; and alkaline phosphatase was at a peak around the 26th week; cholesterol and triglycerides were always low. The same parameters were also measured in some of the pathological fetuses and compared with their normal counterparts. 相似文献
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对普通729 滤料和疏水729 滤料的透气性、阻力特性、静态集尘特性以及在加湿和不加湿两种条件下的动态集尘清灰特性进行了全面的试验研究,通过对两种滤料各项性能的试验结果加以分析、比较,从而为疏水滤料处理含湿烟气的实际应用提供指导和依据 相似文献
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常温UASB装置设计与运行控制 总被引:1,自引:0,他引:1
五粮液集团白酒生产销售居全国同行业之首,根据白酒生产的工艺技术和水质特性选择UASB-UBF-SRB工艺处理,运行效果达到国家规定的排放标准,文章着重介绍五粮液集团某车间废水处理站厌氧处理系统四季中各种参数的协调运行控制。 相似文献
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常温上流式厌氧污泥床反应器处理V_(B12)、淀粉混合废水的研究 总被引:5,自引:0,他引:5
常温(20~25℃)条件下,采用上流式厌氧污泥床(UASB)反应器处理维生素B_(12)、淀粉混合废水,当进水COD_(cr)浓度为8200~8900mg/L时,容积负荷可达到9.6kg/m~3d;COD_(cr)去除率为83.2%;产气率为0.436m~3/kgCOD_(cr)(去除)。 相似文献
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