检索结果-南通市图书馆

Chen Jiayong:Pioneer in hydrometallurgy and chemical engineering disciplines

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第1期35卷 2-5页

作者： zai-sha mao Huizhou Liu Chao Yang Institue of Process Engineering Chinese Academy of SciencesBeijing 100190China

*** Jiayong(Chia-Yung)was born on Feb.17,1922 in a prestigous intellectual clan at Jintang County,Sichuan Province,*** receiving early education at the Chengdu County Middle School(now Chengdu 7th School),he was admitted as an undergraduate student to the Department of Chemical Engineering,the National Central University at the city of Chongqing from 1939 through 1943 during the Anti-Japanese *** graduation,he continued to work as a teaching assistant for both the inorganic and organic chemistry courses.

关键词： Chongqing Pioneer admitted

Effect of impeller type and scale-up on spatial distribution of shear rate in a stirred tank

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第2期35卷 351-363页

作者： Huina Wang Xiaoxia Duan Xin Feng zai-sha mao Chao Yang CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

The main spatial distribution features of shear rate in a stirred tank operated with five different radial and axial flow impellers were presented with particle image velocimetry(PIV)*** only the average shear rate in the whole tank but also the local value in the vicinity of impeller increases linearly with impeller ***,the shear coefficient(Ks,imp)at the impeller outlet is linearly related to the impeller flow number(Nq)and decreases with the increase of Nq in general at the constant power consumption per unit volume(Pv).During scale-up based on the constant Pv and geometric similarity,CFD results show that the volume-averaged shear rate(cavg)for RDT decreases faster than that of other impellers with the impeller tip velocity(Utip).The novel multi-blade combined(MBC)impeller with the increased height-to-diameter ratio of the stirred tank is able to more effectively improve the distribution uniformity of shear rate at the same Pv after *** studies provide a data basis for selecting the impeller types and improving the shear rate environment in the large-scale stirred tank.

关键词： Particle image velocimetry Shear rate distribution Constant power consumption per unit volume Computational fluid dynamics Scale-up

Process Intensification in Pneumatically Agitated Slurry Reactors

在线全文

学校读者我要写书评

暂无评论

Engineering 2021年第3期7卷 304-325页

作者： Shujun Geng zai-sha mao Qingshan Huang Chao Yang Key Llaboratory of Biofues Qingdao Institute of Eioenergy and Bioprocess TednologyChinese ALcadermy of SsciencesQingdao 266101China Dalian Narional Labor atary or dlean Energy Dalian lustitue of chemical PhysitsChinese Academy of SciancesDalian 11623China Key Laboratary of areen Proces and Engireering Iistitue of Poess Eingireeringhinese Academy of SdercesBeijing 100190Ohina

Pneumatically agitated slurry reactors,including bubble column reactors and airlift loop reactors(ALRs),are important gas-liquid-solid multiphase *** reactors have been widely applied in many processes,especially in the biological fermentation and energy chemical industry,due to their low shear stress,good mixing,perfect mass-/heat-transfer properties,and relatively low *** further improve the performance of slurry reactors(i.e.,mixing and mass/heat transfer)and to satisfy industrial require-ments(e.g.,temperature control,reduction of back-mixing,and product separation),the process intensi-fication of slurry reactors is *** article starts by reviewing the latest advancements in the intensification of mixing and mass/heat transfer in these two types of *** then summarizes process-intensification methods for mixing and separation that allow continuous production in these slurry ***-intensification technology that integrates directional flow in an ALR with simple solid-liquid separation in a hydrocyclone is recommended for its high efficiency and low *** arti-cle also systematically addresses vital considerations and challenges,including flow regime discrimina-tion,gas spargers,solid particle effects,and other concerns in slurry *** introduces the progress of numerical simulation using computational fluid dynamics(CFD)for the rational design of slurry reactors and discusses difficulties in ***,it presents conclusions and perspectives on the design of industrial slurry reactors.

关键词： Slurry reactors Pneumatic agitation Bubble column Airlift loop reactor Process intensification Solid particles

CFD simulation of flow and mixing characteristics in a stirred tank agitated by improved disc turbines

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2022年第10期50卷 95-107页

作者： Zhuotai Jia Lele Xu Xiaoxia Duan zai-sha mao Qinghua Zhang Chao Yang CAS Key Laboratory of Green Process and Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China School of Chemical Engineering Nanjing Tech UniversityNanjing 211816China

To reduce the power consumption and improve the mixing performance in stirred tanks,two improved disc turbines namely swept-back parabolic disc turbine(SPDT)and staggered fan-shaped parabolic disc turbine(SFPDT)are *** validation of computational fluid dynamics(CFD)model with experimental results,CFD simulations are carried out to study the flow pattern,mean velocity,power consumption,pumping capacity and mixing efficiency of the improved and traditional impellers in a dished-bottom tank under turbulent flow conditions,The results indicate that compared with the commonly used parabolic disc turbine(PDT),the power number of proposed SPDT and SFPDT impellers is reduced by 43%and 12%,and the pumping efficiency is increased by 68%and 13%,***,under the same power consumption(0-700 W·m^(-3)),the mixing performance of both SPDT and SFPDT is also superior to that of Rushton turbine and PDT.

关键词： Flow regime Mixing time Stirred vessel Computational fluiddynamics Improved discturbine

Numerical investigation of the influence of kinetics and shape factor on barium sulfate precipitation in a continuous stirred tank

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2009年第3期3卷 272-281页

作者： Zheng WANG zai-sha mao Chao YANG Qinghua ZHANG Jingcai CHENG National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China State Key Laboratory of Chemical Safety and Control SINOPEC Qingdao Research Institute of Safety EngineeringQingdao 266071China

The effect of kinetics and shape factor on barium sulfate precipitation in a continuous stirred tank has been investigated numerically through solving the standard momentum and mass transport equations in combination with the moment equations for crystal population *** numerical method was validated with the literature *** simulated results include the distribution of the local supersaturation ratio in the reactor,the mean crystal size,and the coefficient of *** simulation results show that the value of shape factor used in the model affected greatly the mean crystal size and the moments of the crystal size *** influence of the kinetic expressions on the simulation is also *** is important to investigate the relationship of the shape factor with the precipitator type and other operation conditions to obtain reliable simulation results and suitable kinetic equations of crystal nucleation and growth rates.

关键词： stirred tank numerical simulation precipita-tion shape factor crystal kinetics

MXene Hybridized Polymer with Enhanced Electromagnetic Energy Harvest for Sensitized Microwave Actuation and Self‑Powered Motion Sensing

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第3期17卷 265-279页

作者： Yu‑Ze Wang Yu‑Chang Wang Ting‑Ting Liu Quan‑Liang Zhao Chen‑sha Li mao‑Sheng Cao School of Materials Science and Engineering Beijing Institute of TechnologyBeijing 100081People’s Republic of China School of Materials Science and Engineering Peking UniversityBeijing 100871People’s Republic of China School of Mechanical and Material Engineering North China University of TechnologyBeijing 100144People’s Republic of China Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education of the People’s Republic of ChinaHeilongjiang UniversityHarbin 150080People’s Republic of China

Polymeric microwave actuators combining tissue-like softness with programmablemicrowave-responsive deformation hold great promise for mobile intelligentdevices and bionic soft robots. However, their application is challenged by restricted electromagneticsensitivity and intricate sensing coupling. In this study, a sensitized polymericmicrowave actuator is fabricated by hybridizing a liquid crystal polymer with Ti3C2Tx(MXene). Compared to the initial counterpart, the hybrid polymer exhibits unique spacechargepolarization and interfacial polarization, resulting in significant improvements of230% in the dielectric loss factor and 830% in the apparent efficiency of electromagneticenergy harvest. The sensitized microwave actuation demonstrates as the shortenedresponse time of nearly 10 s, which is merely 13% of that for the initial shape memory polymer. Moreover, the ultra-low content of MXene (upto 0.15 wt%) benefits for maintaining the actuation potential of the hybrid polymer. An innovative self-powered sensing prototype that combinesdriving and piezoelectric polymers is developed, which generates real-time electric potential feedback (open-circuit potential of ~ 3 mV) duringactuation. The polarization-dominant energy conversion mechanism observed in the MXene-polymer hybrid structure furnishes a new approachfor developing efficient electromagnetic dissipative structures and shows potential for advancing polymeric electromagnetic intelligent devices.

关键词： Microwave absorption Electromagnetic response Energy harvest Self-sensing Soft actuator

First Passage Density of Brownian Motion with Two-sided Piecewise Linear Boundaries

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2024年第6期40卷 1505-1520页

作者： Zhen YU mao zai TIAN Center for Applied Statistics School of StatisticsRenmin University of ChinaBeijing 100872P.R.China School of Mathematics and Data Science Changji UniversityChangji 831100P.R.China

The first passage time has many applications in fields like finance,econometrics,statistics,and ***,explicit formulas for the first passage density have only been obtained for a few *** paper derives an explicit formula for the first passage density of Brownian motion with twosided piecewise continuous boundaries which may have some points of *** are used to obtain a simplified formula for estimating the first passage ***,the results are also generalized to the case of two-sided general nonlinear *** can be easily carried out with Monte Carlo method and it is demonstrated for several typical two-sided boundaries that the proposed approximation method offers a highly accurate approximation of first passage density.

关键词： Boundary non-crossing probability first density passage density two-sided piecewise continuous boundaries Brownian motion

Polarization-space joint mainlobe jamming countermeasure technique based on divided dimensions

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2022年第3期33卷 594-599页

作者： sha Minghui mao Erke ZHANG Kang School of Information and Electronics Beijing Institute of TechnologyBeijing 100081China Beijing Institute of Radio Measurement Beijing 100854China

In order to solve the problem that the traditional space jamming countermeasure cannot deal with the mainlobe self-protecting jammings,a polarization-space joint mainlobe jamming countermeasure technique based on divided dimensions is ***,the digital beam of each row and column is firstly formed by using dual polarization digital receiving in ***,the polarization-space joint cancellation in both azimuth and elevation dimensions is carried out based on the polarization-space joint difference between the target echo and the jamming,as well as the divided dimension feature of the row and column ***,the sum and difference beams of the full array in the elevation or azimuth dimension are formed by the beams after jamming cancelling,and the monopulse angle measurement is further employed to obtain target *** effectiveness of the proposed technique is verified by simulations,indicating that the self-protecting jamming and multiple mainlobe following jammings can be both cancelled simultaneously with the angle measurement unchanged.

关键词： mainlobe jamming countermeasure self-protecting jamming following jamming polarization-space joint cancelling dimension-divided angle measurement

在线全文

学校读者我要写书评

暂无评论

颗粒群研究:多相流多尺度数值模拟的基础

过程工程学报 2008年第4期8卷 645-659页

作者：毛在砂中国科学院过程工程研究所绿色过程与工程重点实验室北京100190

用两流体模型及颗粒轨道模型数值模拟过程工程设备中的多相流,都需要表达浓度较高的分散相和连续相间的作用力的本构方程.本工作综述了多相流中颗粒受力研究的现状和尚待解决的问题.对单个颗粒(包括流体颗粒)在静止和运动流体中的受力... 详细信息

用两流体模型及颗粒轨道模型数值模拟过程工程设备中的多相流,都需要表达浓度较高的分散相和连续相间的作用力的本构方程.本工作综述了多相流中颗粒受力研究的现状和尚待解决的问题.对单个颗粒(包括流体颗粒)在静止和运动流体中的受力情况的研究结果比较丰富,但对颗粒群的研究则很不充分.对颗粒受的曳力研究较多,但还缺乏可信的计算升力、非稳态力等的公式.因此颗粒群的研究成为多相流准确多尺度数值模拟的关键.开发能处理整体和局部均存在非均匀性的多相流的高效算法也是有待克服的困难.

关键词：颗粒液滴气泡颗粒群相问作用力多相流数值模拟颗粒聚团