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71.
Alan J. Potok Frank H. Quinn 《Journal of the American Water Resources Association》1979,15(6):1538-1555
ABSTRACT: A one-dimensional hydraulic transient model has been designed for water resource studies of Lake Ontario and the Upper St. Lawrence River. The model simulates water surface profiles and flows in the St. Lawrence River between Lake Ontario and the Moses-Saunders Power Dam under both open water and ice-covered conditions. Errors in water surface elevations were found to be less than 0.2 feet during quasi-steady conditions on the river. Comparable errors occurred during the ice-covered conditions. A sensitivity analysis found the model to be most sensitive to the roughness coefficients and the flow through the power dam. 相似文献
72.
悬挑结构是建筑物中常见的结构型式,应用较为广泛.由于设计、施工和使用的原因,致使悬挑结构产生严重的缺陷,造成人员伤亡或结构损坏.分析了悬挑结构产生缺陷的原因,根据其不同的型式提出了加固处理方案. 相似文献
73.
74.
锂离子电池用新型复合聚合物电解质膜的性能研究 总被引:2,自引:0,他引:2
聚合物电解质膜是影响锂离子电池性能的重要因素,通过对聚合物的改性,能够改善聚合物电解质膜综合性能.本文以偏氟乙烯-六氟丙烯共聚物[P(VDF-HFP)]为基,以N甲基吡咯烷酮(NMP)作溶剂,γ-丁内酯(γ-BL)作添加剂,用倒相湿法制备出复合聚合物电解质膜,并对其离子传递、膜结构和电化学性能进行了研究.用限制扩散方法测定了该电解质膜的锂离子扩散系数为5.68×10-10 cm2·s-1;用稳态极化法测定了该电解质膜的迁移数为0.61;用交流阻抗法测得该电解质膜的室温最高电导率可达1.73×10-3S·cm-1.测试结果表明,该聚合物电解质膜具有较好的离子传输性质和电化学性能. 相似文献
75.
Elham Abaie Limeimei Xu Yue-xiao Shen 《Frontiers of Environmental Science & Engineering》2021,15(6):124
76.
Besides its effects of the genetic material and function, chromate also immediately affects the structure and function of cell membranes. With human erythrocytes, chromate produces alterations in cell size and shape, it impairs the anion transport function, and it causes modifications in membrane constituents. The proteins have been analysed by one‐ and two‐dimensional gel electrophoresis and by fast protein liquid chromatography (FPLC). The main chromate effects are the crosslinking of proteins including the membrane protein bands 1 and 2 (spectrin) and haemoglobin. Furthermore, a 40.000 D membrane protein fraction is modified. Chromate may react directly with membrane constituents but evidence also points to the formation of reactive oxygen compounds which in turn may react with proteins and lipids of the cell membrane. 相似文献
77.
This paper presents pilot‐scale membrane treatment results performed on biologically treated effluents from fermentation industry and ozone oxidation on concentrates from the same membrane treatment system. The results obtained from the ultrafiltration (UF) and/or the reverse osmosis (RO) systems indicate that membrane treatment are very effective for COD, Color, NH3‐N and conductivity removal. Ozone oxidation of the membrane concentrates was tested to increase biodegradability of the wastes. The initial ratios of Biochemical oxygen demand (BOD5) to Chemical oxygen demand (COD) were increased significantly by applying chemicaloxidation with O3 and O3 + H2O2. 相似文献
78.
The effects of lithium (Li) supplementation on lipid profile and fluidity of cerebrum and cerebellum membranes in aluminum (Al)-treated rats were investigated. A significant decrease in the levels of total lipids and cholesterol was observed in both the regions following Al exposure, which however were significantly increased following Li supplementation. Further, glycolipids and gangliosides contents were significantly decreased in cerebrum, but increased in cerebellum following Al treatment. Interestingly, Li supplementation reversed the trends and regulated the levels of glycolipids and gangliosides. Al treatment also elevated conjugated diene formation and phospholipid levels in both cerebrum and cerebellum membranes, which however were decreased upon Li supplementation. The cholesterol/phospholipid ratio however was decreased after Al treatment and Li supplementation was able to enhance the ratio in both cerebrum and cerebellum. Further, Al treatment significantly increased the fluorescence polarization, anisotropy and order parameter, which however were normalized following Li supplementation. The levels of Al were also found to be significantly elevated in cerebrum and cerebellum after Al treatment and normalized in cerebellum following Li treatment. Therefore, the present study shows the potential of Li in regulating the changes produced by Al on membrane composition and fluidity in rat brain. 相似文献
79.