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A computational simulation study for techno-economic comparison of conventional and stripping gas methods for natural gas dehydration

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Chinese Journal of Chemical Engineering 2020年第9期28卷 2285-2293页

作者： Muhammad Salman Liangliang Zhang jianfeng chen Research Centerof the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical TechnologyBeijing 100029China StateKey Laboratory of Organic-Inorganic Composites Beijing University of Chemical TechnologyBeijing 100029China

In the present work,the conventional natural gas dehydration method(CDM)and stripping gas method(SGM)are technically and economically analyzed,utilizing Aspen HYSYS and Aspen Process Economic Analyzer(APEA),*** optimize the CDM and SGM,the sensitivities of the water content of dry gas,reboiler duty and raw material loss are analyzed against solvent rate and stripping gas *** optimized processes are set to achieve a targeted value of water content in dry gas and analyzed at optimized *** analysis shows that SGM gives 46%lower TEG feed rate,42%lower reboiler duty and 99.97%pure regenerated ***,economic analysis reveals that SGM has 38%lower annual operating cost compared to *** to results,from both technical and economic point of view,SGM is more feasible for natural gas dehydration compared to CDM.

关键词： Natural gas dehydration Technical analysis Parametric optimization Economic study Aspen HYSYS

Preparation of mesoporous silica microspheres with multi-hollow cores and their application in sustained drug release

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Particuology 2010年第5期8卷 447-452页

作者： chen Zhang Tian Hou jianfeng chen Lixiong Wen Key Lab for Nanomaterials Ministry of Education Beijing University of Chemical Technology Beijing 100029 China Research Center of the Ministry of Education for High Gravity Engineering & Technology Beijing University of Chemical Technology Beijing 100029 China

Mesoporous silica microspheres with multi-hollow cores （MSMMCs） were prepared by an O1/W/O2 double emulsion technique. When tetraethyl orthosilicate （TEOS） was hydrolyzed in the O1/W/O2 double emulsion with P123 （a triblock copolymer with a formula of HO（CH2CH20）20（CH2CH（CH3）O）70（CH2CH2O）20H） dissolved in the aqueous phase, the internal oil droplets would serve as templates for the empty hollow cores, P123 function as templates for the mesopores in the shell, and the aqueous phase act as space-limiting micro-reactors for the hydrolysis process, thus forming MSMMCs with controllable size and hollow cores. After further modification by a high-temperature aging process, the prepared MSMMCs had a diameter of 2-10 μm, with macromulti-hollow cores with a size of 100-1000 nm, mesopores in the shell with a size of 3.8-4.4 nm, and a surface area of 383-735 m2/g. In addition, MSMMCs were used as carriers to load avermectin through an immersing and evaporating process, and the loaded avermectin showed a well sustained release behavior from the MSMMCs matrix. This study demonstrated a promising and simple method for preparing silica micro-particles with porous multi-hollow core structure for sustained release applications.

关键词： SilicaPreparationHollow structureSustained release

Synthesis of nano-CaCO_3 composite particles and their application

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Journal of University of Science and Technology Beijing 2008年第1期15卷 67-73页

作者： Wei Wu Xueqin Zhang jianfeng chen Shuling Shen Key Lab of the Ministry of Education of China for Nanomaterials Beijing University of Chemical Technology Beijing 100029 China Research Center of the Ministry of Education of China for High Gravity Engineering and Technology Beijing University of Chemical Technology Beijing 100029 China

Nano-calcium carbonate composite particles were synthesized by the soapless emulsion polymerization technique of double monomers. The composite particles formation mechanism was investigated. The effects of composite particles on the mechanical properties of nano-CaCO3-ABS （acrylonitrile-butadiene-styrene copolymer） composite material were studied. It was validated that the composite particles are made up of the nano-calcium carbonate cores and the shells of alternating copolymers of butyl acrylate （BA） and styrene （St）. The shells are chemically grafted and physically wrapped on the surface of nano-calcium carbonate particles. When the composite particles were filled in ABS matrix, the CaCO3 particles are homogeneously dispersed in the composite material as nanoscales. The impact strength of the composite material is obviously enhanced after filling appropriate amounts of composite particles. It can be concluded that the soapless emulsion polymerization of double monomers is an effective method for nano-CaCO3 surface treatment. 2008 University of Science and Technology Beijing. All rights reserved.

关键词： nano-calcium carbonate composite particles soapless emulsion polymerization composite material mechanical properties mechanism

Database application research in real-time data access of accelerator control system

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Nuclear Science and Techniques 2012年第5期23卷 267-271页

作者： chen Guanghua chen jianfeng WAN Tianmin Shanghai Institute of Applied Physics Chinese Academy of Sciences Zhangffiang Campus Shanghai 210200 China

The control system of Shanghai Synchrotron Radiation Facility (SSRF) is a large-scale distributed real-time control system. It involves many types and large amounts of real-time data access during the operating. Database system has wide application prospects in the large-scale accelerator control system. It is the future development direction of the accelerator control system, to replace the differently dedicated data structures with the mature standardized database system. This article discusses the application feasibility of database system in accelerators based on the database interface technology, real-time data access testing, and system optimization research and to establish the foundation of the wide scale application of database system in the SSRF accelerator control system. Based on the database interface technology, real-time data access testing and system optimization research, this article will introduce the application feasibility of database system in accelerators, and lay the foundation of database system application in the SSRF accelerator control system.

关键词：分布式实时控制系统加速器控制系统数据库系统应用可行性数据访问上海同步辐射装置油门控制系统接口技术

Kirigami/origami:unfolding the new regime of advanced 3D microfabrication/nanofabrication with“folding”

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Light(Science & Applications) 2020年第1期9卷 1309-1327页

作者： Shanshan chen jianfeng chen Xiangdong Zhang Zhi-Yuan Li Jiafang Li Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement(Ministry of Education) Beijing Key Lab of Nanophotonics&Ultrafine Optoelectronic Systemsand School of PhysicsBeijing Institute of Technology100081 BeijingChina College of Physics and Optoelectronics South China University of Technology510640 GuangzhouChina

Advanced kirigami/origami provides an automated technique for modulating the mechanical,electrical,magnetic and optical properties of existing materials,with remarkable flexibility,diversity,functionality,generality,and *** this paper,we review the latest progress in kirigami/origami on the microscale/nanoscale as a new platform for advanced 3D microfabrication/*** stimuli of kirigami/origami,including capillary forces,residual stress,mechanical stress,responsive forces,and focussed-ion-beam irradiation-induced stress,are introduced in the microscale/nanoscale *** stimuli enable direct 2D-to-3D transformations through folding,bending,and twisting of microstructures/nanostructures,with which the occupied spatial volume can vary by several orders of magnitude compared to the 2D *** an instant and direct method,ion-beam irradiation-based tree-type and close-loop nano-kirigami is highlighted in *** progress in microscale/nanoscale kirigami/origami for reshaping the emerging 2D materials,as well as the potential for biological,optical and reconfigurable applications,is briefly *** the unprecedented physical characteristics and applicable functionalities generated by kirigami/origami,a wide range of applications in the fields of optics,physics,biology,chemistry and engineering can be envisioned.

关键词： regime folding enable

Topological photonic states in gyromagnetic photonic crystals:Physics,properties,and applications

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Chinese Physics B 2022年第11期31卷 1-11页

作者： jianfeng chen Zhi-Yuan Li School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China

Topological photonic states(TPSs)as a new type of waveguide state with one-way transport property can resist backscattering and are impervious to defects,disorders and metallic *** photonic crystal(GPC)is the first artificial microstructure to implement TPSs,and it is also one of the most important platforms for generating truly one-way TPSs and exploring their novel physical properties,transport phenomena,and advanced ***,we present a brief review of the fundamental physics,novel properties,and practical applications of TPSs based on *** first examine chiral one-way edge states existing in uniformly magnetized GPCs of ordered and disordered lattices,antichiral one-way edge states in cross magnetized GPCs,and robust one-way bulk states in heterogeneously magnetized ***,we discuss the strongly coupling effect between two co-propagating(or counter-propagating)TPSs and the resulting physical phenomena and device ***,we analyze the key issues and prospect the future development trends for TPSs in *** purpose of this brief review is to provide an overview of the main features of TPSs in GPC systems and offer a useful guidance and motivation for interested scientists and engineers working in related scientific and technological areas.

关键词： topological photonic states gyromagnetic photonic crystal one-way edge states

Preparation of ultrafine chitosan particles by reverse microemulsion

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China Particuology 2007年第6期5卷 384-390页

作者： Guogen Liu Lei Shao Fei Ge jianfeng chen Key Lab for Nanomaterials Ministry of Education Beijing University of Chemical Technology Beijing 100029 China Research Center of Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical Technology Beijing 100029 China

Ultrafine chitosan particles were prepared by reverse microemulsion consisting of water, Triton X-100, octanol and cyclohexane. Two methods of preparing ultrafine chitosan particles were adopted and compared using TEM and IR, and possible mechanisms for the formation of ultrafine chitosan particles were proposed. Experimental results show that the method which combined ionic gelation and cross-linking gave uniformly sized chitosan nanoparticles with an average diameter of 92 nm, while the cross-linking without ionic gelation produced spindly chitosan particles with an average length of 943 nm and width of 188 nm.

关键词： Chitosan Ultrafine particles Microemulsion

High Selectivity Cascaded Quadruplet Bandpass Filter with Three Pairs of Transmission Zeros

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Chinese Journal of Electronics 2017年第5期26卷 1101-1104页

作者： chen jianfeng chen Fuchang LI Runshuo XIE Zeming CHU Qingxin School of Electronic and Information Engineering South China University of Technology

A novel microstrip Cascaded quadruplet(CQ) bandpass filter using quarter wavelength resonators and three-quarter wavelength resonators is *** on cross coupling and source-load coupling,three pairs of finite transmission zeros are generated at the *** a result,the out-of-band rejection can be enhanced and high selectivity is *** on the proposed structure,a cascaded quadruplet filter centering at 3.0GHz is designed and *** agreement between the measured and simulated data is obtained.

关键词： Cascaded quadruplet(CQ) Bandpass filter Cross coupling Transmission zeros Microstrip

Synthesis and Photoconductivity of Nanosized Phthalocyanine

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Journal of Materials Science & Technology 2006年第4期22卷 533-535页

作者： Shuguang BIAN Xianggao LI Lei SHAO jianfeng chen Key Lab for Nanomaterials Ministry of Education Beijing University of Chemical Technology Beijing 100029 China College of Chemical Engineering Tianjin University Tianjin 300072 China Research Center of the Ministry of Education for High Gravity Engineering and Technology Beijing University of Chemical Technology. Beijing 100029. China

Functional phthalocyanine （Pc） compounds of H2Pc, TiOPc, FePc and CIAIPc were synthesized with a yield of 46.7%, 91.2%, 37.4% and 34.0%, respectively. Nanosized TiOPc was synthesized via a one-step sol-gel method and effects of surfactant doses, nucleation temperature on TiOPc particle size and photoconductivity were investigated. When re（PEG）： m（TiOPc） was 0.1 and nucleation temperature was 0℃, the as-obtained TiOPc had the smallest particle size and largest specific surface area, which were 60 nm and 83m^2/g, respectively. TiOPc synthesized under these conditions also exhibits excellent photoconductivity with charging potential V0, dark decay speed Rd and energy for half-discharging of potential E1/2 being 1160 V, 30 V/s and 0.6 1x.s, respectively.

关键词： Phthalocyanine Nanosize Synthesis Photoconductivity