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电子银行是传统银行与互联网技术结合的产物,拓宽了传统银行的经营方式,成为向客户提供金融服务的重要渠道。基于层次分析法(AHP)对电子银行项目主要风险指标进行量化,并利用综合评价方法评价风险对项目的影响程度和概率,得出风险发生的可能性,在此基础上提出防范和治理风险的政策建议。 相似文献
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N,O-羧甲基壳聚糖/聚砜复合纳滤膜的制备及性能研究 总被引:1,自引:0,他引:1
以聚砜(PsF)超滤膜为基膜、N,O-羧甲基壳聚糖(NOCC)水溶液为活性层铸膜液、戊二醛(GA)为交联剂,采用涂敷和交联的方法制备了复合纳滤膜.测试了膜表面的流动电势(E)随操作压力(△P)的变化,实验结果表明在电解质溶液中,NOCC/PSF复合NF膜表面荷负电.对其结构和形貌进行了表征,并研究了有机小分子添加剂对复合膜截留性能的影响.NOCC/PSF复合NF膜对几种无机盐的截留顺序为Na2S04>NaCl>MgSOa>MgCl2,呈现出荷负电纳滤膜的截留特征. 相似文献
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天津市南水北调中线滨海新区供水一期工程是天津市内输配水工程的重要组成部分,建设目标和任务是向天津市滨海新区输送引江原水.海河穿越是工程建设的重点和难点,穿越方案的选择不仅要安全可靠,还要经济,便于实施,经分析论证推荐采用分期导流明挖方案. 相似文献
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采用湿相转化法制备了以活性艳蓝KN-R为印迹分子的醋酸纤维素(CA)-聚偏二氟乙烯(PVDF)分子印迹膜(MIM).实验结果表明在一定的制备条件下可制得具有较大吸附结合率的MIM,此时的铸膜液组成为:活性艳蓝KN-R质量浓度硼ω1为0.1%,共混组成比ω(CA):ω(PVDF)=9.5:0.5,聚合物质量浓度ωp,为14%,添加剂LiCl质量浓度ωa为7.5%.所制得的MIM是一种特异分子吸附膜,对印迹分子具有亲和性,其分离机理属于延迟渗透机理.在一定范围(0~0.1%)内,随着印迹分子活性艳蓝KN-R质量浓度增大,MIM的吸附选择性提高.由吸附焓△H0及MIM与印迹分子间结合力强弱的测定结果可知,MIM与印迹分子之间的结合作用力以疏水/范德华力与氢键作用为主. 相似文献
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N, O-carboxymethyl chitosan (NOCC) composite nanofiltration (NF) membranes were prepared by coating and cross-linking. The fermentation effluent from a wine factory was treated with the resulting NOCC/polysulfone (PSF) composite NF membranes. The permeate flux and the removal efficiencies of the resulting NF membranes for the color, chemical oxygen demand (CODcr), total organic carbon (TOC), and conductivity of the fermentation effluent were investigated in relation to the driving pressure, the feed flow, and the operation time. The permeate flux and the removal efficiencies were found to increase with the increase of the driving pressure or the feed flow. At 0.40 MPa and ambient temperature the removal efficiencies were 95.5%, 70.7%, 72.6%, and 31.6% for color, CODcr, TOC, and conductivity, respectively. The membrane was found to be stable over a 10-h ooeration for the fermentation effluent treatment. 相似文献