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Effects of a novel bimetallic catalytic biofilter-based pretreatment technique on the form of ultrafiltration membrane fouling

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Chinese Journal of Chemical Engineering 2020年第10期28卷 2513-2522页

作者： Songze Hao Xuehui Zhao Hongwei Zhang Yun Wu Cheng Fang xujia wang State Key Laboratory of Separation Membrane and Membrane Process Tiangong UniversityTianjin 300387China School of Materials Science and Engineering Tiangong UniversityTianjin 300387China School of Environmental Science and Engineering Tiangong UniversityTianjin 300387China

Pretreatments of influents using bimetallic catalytic biofilter(BC-biofilter)can help reduce transmembrane *** ultrafiltration membranes coupled with a conventional biofilter pretreatment,the cake layer resistance accounts for 25.0%of the total ***,for those coupled with BC-biofilter pretreatment,the cake layer resistance accounts only for 12.5%of the total *** laser scanning microscopy is employed to determine the porosity of cake *** is found that ultrafiltration membranes with BC-biofilter pretreatment show a cake layer porosity of up to 0.56 or greater,whereas those with a conventional biofilter pretreatment exhibit a cake layer porosity of only *** is because micro-flocculation occurs in the effluents of *** flocs generated through flocculation deposit on membrane surfaces to create highly porous cake ***,catalytic reduction can increase the zeta potentials of the biofilter *** makes the deposition of colloidal particles and flocs on membrane surfaces difficult under electrostatic ***,micro-flocculation after BC-biofilter pretreatment can remove colloidal particles with particle sizes of200–350 nm in *** can effectively prevent the blockage of ultrafiltration membrane ***,compared to conventional biofilter,BC-biofilter pretreatment can more effectively reduce the number of colloidal particles and the van der Waals forces of ultrafiltration *** can also change the action directions of electric double layers and thereby mitigate ultrafiltration membrane fouling.

关键词： Catalytic reduction Micro-flocculation Cake layer Membrane pore Membrane fouling

The General Design and Technology Innovations of CAP1400

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Engineering 2016年第1期2卷 97-102页

作者： Mingguang Zheng Jinquan Yan Jun Shenttu Lin Tian xujia wang Zhongming Qiu Shanghai Nuclear Engineering Research and Design Institute Shanghai 200233 China

The pressurized water reactor CAP1400 is one of the sixteen National Science and Technology Major Projects. Developed from China＇s nuclear R＆D system and manufacturing capability, as well as APIO00 technology introduction and assimilation, CAP1400 is an advanced large passive nuclear power plant with independent intellectual property rights. By discussing the top design principle, main performance objectives, general parameters, safety design, and important improvements in safety, economy, and oth- er advanced features, this paper reveals the technology innovation and competitiveness of CAP1400 as an internationally promising Gen-IIl PWR model. Moreover, the R＆D of CAP1400 has greatly promoted China＇s domestic nuclear power industry from the Gen-II to the Gen-III level.

关键词： CAPI400 Advanced passive technology General designLocalizationTechnology innovation

A NOTE ON THE YAMABE PROBLEM

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维普期刊数据库

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Journal of Partial Differential Equations 2005年第4期18卷 322-326页

作者： wang xujia Centre for Mathematics and its Applications Australian National University Canberra ACT 0200 Australia Nankai Institute of Mathematics Nankai University Tianjin 300071 China

In this note we verify the key inequality Y1（M）〈Y1 （S^n） for the Yamabe constant Y1（M） for manifolds M not conformal to the unit sphere, by using asolution to an associated equation as a test function.

关键词： Convex hypersurface Weingarten curvature.

Fuzzy comprehensive evaluation on the government purchase pension service quality management

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Fuzzy comprehensive evaluation on the government purchase pe...

2013年教育技术与管理科学国际会议

作者： wang xujia Lai Yu School of Management Xi’an University of Architecture and Technology

This paper is combined with successful cases of the Chinese typical city governments purchase pension service, and on this basis, analyzing the present situations、advantages and disadvantages of social organizations provide pension service quality supervision and evaluation in actual operation. The developed countries mature management experience for reference, using the theory of system engineering to construct suitable for Chinese government purchase pension service quality management effectiveness index system from four aspects, which is the life care services, physical and mental health services, leisure and recreation services and safety and hygiene services, and to evaluate each factor priority of the index system’s criterion layer and the index layer with quantitative fuzzy comprehensive method. Evaluation result for guarantee elderly pension life quality, improve allocation efficiency of the public service resource, and perfect the pension service management processes, thus promoting the development of social organizations, expanding public management theory and research method has a very important practical and theoretical significance.

关键词： Government purchase Pension service Quality management NSFDSS Comprehensive evaluation

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压水堆MSLB叠加SGTR事故分析

清华大学学报（自然科学版） 2007年第3期47卷 373-376页

作者：王煦嘉臧希年清华大学工程物理系北京100084

为了更好地分析压水堆发生主蒸汽管道断裂(main steam line break,MSLB)叠加一根蒸汽发生器传热管破裂(steam generator tube repture,SGTR)叠加事故的热工水力过程,用Relap5/mod3.2程序对事故进程进行模拟。比较计算结果与参考电站结果... 详细信息

为了更好地分析压水堆发生主蒸汽管道断裂(main steam line break,MSLB)叠加一根蒸汽发生器传热管破裂(steam generator tube repture,SGTR)叠加事故的热工水力过程,用Relap5/mod3.2程序对事故进程进行模拟。比较计算结果与参考电站结果,一回路压力、一次侧向二次侧泄漏流量等主要参数变化趋势一致,安注投入等安全响应的情况基本相同,证明了本次计算的可信性。分析主要参数的变化趋势并解释其变化原因,总结出完整的事件序列和操作员干预的措施。对堆芯水位的计算结果表明:操作员在10min内对事故进行干预情况下堆芯不裸露,反应堆是安全的。

关键词：反应堆事故及其分析 RELAP 5 主蒸汽管道断裂蒸汽发生器传热管破裂

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球面上的一类最优运输问题

中国科学：数学 2018年第1期48卷 181-200页

作者：李奇睿汪徐家 Mathematical Sciences Institute The Australian National University Canberra ACT 2601 Australia

本文考虑球面S^n上成本函数为c(x,y)=F(d(x,y))的最优运输问题,其中d(x,y)表示S^n上两点x与y之间的球面距离.重点是说明,即使F仅定义于原点的一个邻域内,在适当条件下仍然可以证明最优映射的存在性和唯一性.特别是当F(d)=log(κcos d-1)... 详细信息

本文考虑球面S^n上成本函数为c(x,y)=F(d(x,y))的最优运输问题,其中d(x,y)表示S^n上两点x与y之间的球面距离.重点是说明,即使F仅定义于原点的一个邻域内,在适当条件下仍然可以证明最优映射的存在性和唯一性.特别是当F(d)=log(κcos d-1)(κ>1)和F(d)=log cos d时,相应的最优运输问题分别等价于几何光学中的光线折射问题和凸体几何中的Aleksandrov问题.

关键词：最优运输无界成本函数凸分析变分问题

EXISTENCE　OF　NONTRIVIAL　SOLUTIONS　FOR　CRITICAL　SEMILINEAR　BIHARMONIC　EQUATIONS

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Systems Science and Mathematical Sciences 1994年第2期7卷 140-152页

作者： GU Yonggeng(Institute of Systems Science, Academia Sinica, Beijing 100080, China)DENG Yinbin(Department of Mathematics, Huazhong Normal University ,Wuhan 430070, China)wang xujia(Department of Mathematics, Zhejiang University, Hangzhou 310027, China)

ＥＸＩＳＴＥＮＣＥＯＦＮＯＮＴＲＩＶＩＡＬＳＯＬＵＴＩＯＮＳＦＯＲＣＲＩＴＩＣＡＬＳＥＭＩＬＩＮＥＡＲＢＩＨＡＲＭＯＮＩＣＥＱＵＡＴＩＯＮＳ￥ＧＵＹｏｎｇｇｅｎｇ（ＩｎｓｔｉｔｕｔｅｏｆＳｙｓｔｅｍｓＳｃｉｅｎｃｅ，... 详细信息

ＥＸＩＳＴＥＮＣＥＯＦＮＯＮＴＲＩＶＩＡＬＳＯＬＵＴＩＯＮＳＦＯＲＣＲＩＴＩＣＡＬＳＥＭＩＬＩＮＥＡＲＢＩＨＡＲＭＯＮＩＣＥＱＵＡＴＩＯＮＳ￥ＧＵＹｏｎｇｇｅｎｇ（ＩｎｓｔｉｔｕｔｅｏｆＳｙｓｔｅｍｓＳｃｉｅｎｃｅ，ＡｃａｄｅｍｉａＳｉｎｉｃａ，Ｂｅ...

关键词： Nontrivial solution biharmonic equations critical Sobolev exponent.

NEUMANN　PROBLEM　OF　ELLIPTIC　EQUATIONS　WITH　LIMIT　NONLINIEARITY　IN　BOUNDARY　CONDITION

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Chinese Annals of Mathematics,Series B 1994年第3期15卷 299-310页

作者： DENGYINBING wangxujia WUSHAOPING DepartmentofMathematics HuazhongNormalUniversityWuhan430070China DepartmentofMathematics ZhejiangUniversityHangzhou310027China

This paper deals with a problem proposed by H. Brezis on the existence of positive solutionsto the equation An + u(rt+2)/(n--2) + f(x,u) = 0 under the Neumann boundaly collditionD.u = un/(rt--z), where f(x, u) is a lo... 详细信息

关键词： Neumann problem Semilinear elliptic equation Positive solution.

基于BCC_CPSv2模式的淮河流域月参考作物蒸散概率订正预报

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农业工程学报 2022年第23期38卷 61-69,F0003页

作者：曹雯段春锋徐祥程智汪栩加安徽省农业气象中心/安徽省农业生态大数据工程实验室合肥230031 安徽省气候中心合肥230031 安徽省气象科学研究所安徽省大气科学与卫星遥感重点实验室合肥230031

参考作物蒸散(Reference Crop Evapotranspiration,ET0)预报在农业水资源配置、区域干湿演变评估方面有着重要作用。该研究基于国家气候中心第二代气候预测系统(Beijing Climate Center Second-Generation Climate Prediction System,BCC_CPSv2)模式预报数据和1991-2020年淮河流域地面气象观测数据,利用分位数映射法对模式预报的气象要素进行概率订正,采用Penman-Monteith公式计算ET0,并评估了订正前后BCC_CPSv2模式对淮河流域月ET0和气象要素的预报性能。结果表明:1)模式对平均气温、净辐射和相对湿度的预报值较观测值偏小,风速预报值在3-6月偏小,其他月份偏大,4个气象要素预报的均方根误差(Root Mean Square Error,RMSE)分别为1.84℃、1.70 MJ/m2d、15.79%和1.39 m/s;气象要素预报偏差导致2-6月ET0预报值较计算值偏小,1月和7-12月偏大,区域平均RMSE为0.59 mm/d,绝对百分比误差(Mean Absolute Percentage Error,MAPE)为21.9%。2)概率订正有效降低了气象要素和ET0的预报误差。气温、净辐射、相对湿度和风速预报订正值的RMSE均小于订正前;80%月份ET0预报订正值的RMSE小于订正前,区域平均RMSE减小了0.23 mm/d,MAPE减小了11.2%。3)夏半年和冬半年ET0预报误差的首要来源分别是净辐射和相对湿度,主要是由于模式对这2个要素的预报精度较低且ET0对其敏感,误差容易传递。可见,基于模式概率订正的月尺度ET0预报方法精度较高,可以为水资源优化管理、灌溉制度制定和农业中长期需水决策提供参考。

关键词：蒸散气候模式预报概率订正淮河流域