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Scale-up and thermal stability analysis of fluidized bed reactors for ethylene polymerization

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Chinese Journal of Chemical Engineering 2023年第10期62卷 281-290页

作者： Xiaoqiang Fan Jingyuan Sun Jingdai Wang Zhengliang Huang Zuwei Liao Guodong Han Yongrong Yang ningbo Research Institute Zhejiang UniversityNingbo 315100China State Key Laboratory of Chemical Engineering College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology Hangzhou 310027China Sinopec Tianjin Company Tianjin 300271China

A set of hydrodynamic similarity laws is applied to the scale-up of ethylene polymerization fluidized bed reactors(FBRs)under the condensed mode *** thermal stability of open-loop controlled FBRs is investigated by the homotopy continuation *** the Hopf bifurcation point is selected as an index of the thermal stability *** simulation results show the similarity in state variables,operation parameters,the space-time yield(STY),and the thermal stability of FBRs with different ***,the thermal stability behaviors and similarity of the closed-loop controlled FBRs with different scales are *** observed similar trend of Hopf bifurcation curves reveals the similarity in the thermal stability of closed-loop controlled FBRs with different scaling *** general,the results of the thermal stability similarity confirm that the hydrodynamics scaling laws proposed in the work are applicable to the scale-up of FBRs under the condensed mode operation.

关键词： Stability Scale-up Polymerization Bifurcation theory Fluidized bed

Macroporous Hydrogels Prepared by Ice Templating: Developments and Challenges

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Chinese Journal of Chemistry 2023年第22期41卷 3082-3096页

作者： Di Chen Biru Yang Chen Yang Jingjun Wu Qian Zhao ningbo Research Institute Zhejiang UniversityNingboZhejiang 315100China State Key Laboratory of Chemical Engineering College of Chemical and Biological EngineeringZhejiang UniversityHangzhouZhejiang 310027China

Macroporous hydrogels are water-swollen polymer networks with porous structures beyond the mesh *** provide high specific surface areas and hieratical mass transfer channels which are desired for emerging applications including cell culturing,bio-separation,and drug delivery.A variety of approaches have been developed to fabricate macroporous hydrogels,including gas foaming,porogen templating,phase separation,3D printing,***,ice templating utilizes the crystallization of water as the porogenation mechanism which doesn't need the leaching of porogens.

关键词： Macroporous hydrogels Porogenation approaches Ice templating Cryogels Network transformation Gels Stimuli-responsivepolymers Crosslinking

Characteristics and source attribution of PM2.5 during 2016 G20 Summit in Hangzhou: Efficacy of radical measures to reduce source emissions

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Journal of Environmental Sciences 2021年第8期33卷 47-65页

作者： Ke Chen Sarah E.Metcalfe Huan Yu Jingsha Xu Honghui Xu Dongsheng Ji Chengjun Wang Hang Xiao Jun He Department of Chemical and Environmental Engineering University of Nottingham Ningbo ChinaNingbo315100China School of Geography University of NottinghamNottinghamNG72RDUK Department of Atmospheric Science School of Environmental StudiesChina University of GeosciencesWuhan430074China School of Geography Earth and Environmental SciencesUniversity of BirminghamEdgbastonBirminghamB152TTUnited Kingdom Zhejiang Institute of Metrological Sciences Hangzhou310008China State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing100029China College of Resources and Environmental Science South-Central University for NationalitiesWuhan430074China Centre for Excellence in Regional Atmos.Environ.Institute of Urban Environment Chinese Academy SciencesXiamen361021China Key Laboratory of Carbonaceous Wastes Processing and Process Intensification Research of Zhejiang Province University of Nottingham Ningbo ChinaNingbo315100China

A field campaign was conducted to study the PM2.5 and atmospheric gases and aerosol’s components to evaluate the efficacy of radical measures implemented by the Chinese government to improve air quality during the 2016 G20 Summit in Hangzhou *** lower level of PM2.5(32.48±11.03μg/m3)observed during the control period compared to precontrol and post-control periods showed that PM2.5 was alleviated by control *** on the mass concentrations of particulate components,the emissions of PM2.5 from local sources including fossil fuel,coal combustion,industry and construction were effectively reduced,but non-exhaust emission was not reduced as effectively as *** accumulation of SNA(SO42-,NO3-,NH4+)was observed during the control period,due to the favourable synoptic weather conditions for photochemical reactions and heterogeneous *** of transboundary transport during the control period,air masses from remote areas contributed significantly to local ***,secondary organic carbon(OCsec)exhibited more sensitivity than primary organic carbon(OCpri)to control measures,and the increased nitrogen oxidation ratio(NOR)implied the regional transport of aged sec-ondary aerosols to the study ***,the results from various approaches revealed that local pollution sources were kept under control,indicating that the implementation of mitigation measures were helpful in improving the air quality of Hangzhou during G20 *** reduce ambient levels of PM2.5 further in Hangzhou,regional control policies may have to be taken so as to reduce the impact of long-range transport of air masses from inland China.

关键词： G20 Summit PM2.5 Long-range transport CMB model

High performance of hot-carrier generation,transport and injection in TiN/TiO_(2)junction

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Frontiers of physics 2022年第5期17卷 35-45页

作者： Tingting Liu Qianjun Wang Cheng Zhang Xiaofeng Li Jun Hu School of Optoelectronic Science and Engineering&Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow UniversitySuzhou 215006China Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province&Key Lab of Modern Optical Technologies of Education Ministry of China Soochow UniversitySuzhou 215006China School of Physical Science and Technology Soochow UniversitySuzhou 215006China School of Physical Science and Technology Ningbo UniversityNingbo 315211China

Improving the performance of generation,transport and injection of hot carriers within metal/semiconductor junctions is critical for promoting the hot-carrier ***,the conversion efficiency of hot carriers in the commonly used noble metals(e.g.,Au)is extremely ***,through a systematic study by first-principles calculation and Monte Carlo simulation,we show that TiN might be a promising plasmonic material for high-efficiency hot-carrier *** with Au,TiN shows obvious advantages in the generation(high density of low-energy hot electrons)and transport(long lifetime and mean free path)of hot *** further performed a device-oriented study,which reveals that high hotcarrier injection efficiency can be achieved in core/shell cylindrical TiN/TiO_(2)*** findings provide a deep insight into the intrinsic processes of hot-carrier generation,transport and injection,which is helpful for the development of hot-carrier devices and applications.

关键词： metal/semiconductor junction plasmonic material hotcarrier generation lifetime and mean free path injection efficiency

One-Dimensional(NH=CINH_(3))_(3)PbI_(5)Perovskite for Ultralow Power Consumption Resistive Memory

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Research 2021年第1期2021卷 704-712页

作者： Xuefen Song Hao Yin Qing Chang Yuchi Qian Chongguang Lyu Huihua Min Xinrong Zong Chao Liu Yinyu Fang Zhengchun Cheng Tianshi Qin Wei Huang Lin Wang Key Laboratory of Flexible Electronics(KLOFE)&Institute of Advanced Materials(IAM) Nanjing Tech University(Nanjing Tech)30 South Puzhu RoadNanjing 211816China Electron Microscope Laboratory Nanjing Forestry UniversityNanjing 210037China MIIT Key Laboratory of Flexible Electronics(KLoFE) Shaanxi Key Laboratory of Flexible Electronics(KLoFE)Xi’an Key Laboratory of Flexible Electronics(KLoFE)Xi’an Key Laboratory of Biomedical Materials&EngineeringXi’an Institute of Flexible ElectronicsInstitute of Flexible Electronics(IFE)Northwestern Polytechnical UniversityXi’an710072 ShaanxiChina

Organic-inorganic hybrid perovskites(OIHPs)have proven to be promising active layers for nonvolatile memories because of their rich abundance in earth,mobile ions,and adjustable ***,there is a lack of investigation on controllable fabrication and storage properties of one-dimensional(1D)***,the growth of 1D(NH=CINH_(3))_(3)PbI_(5)((IFA)_(3)PbI_(5))perovskite and related resistive memory properties are *** solution-processed 1D(IFA)_(3)PbI_(5)crystals are of welldefined monoclinic crystal phase and needle-like shape with the length of about 6 *** exhibit a wide bandgap of 3 eV and a high decomposition temperature of 206℃.Moreover,the(IFA)_(3)PbI_(5)films with good uniformity and crystallization were obtained using a dual solvent of N,N-dimethylformamide(DMF)and dimethyl sulfoxide(DMSO).To study the intrinsic electric properties of this anisotropic material,we constructed the simplest memory cell composed of only Au/(IFA)_(3)PbI_(5)/ITO,contributing to a high-compacted device with a crossbar array device *** resistive random access memory(ReRAM)devices exhibit bipolar current-voltage(I-V)hysteresis characteristics,showing a record-low power consumption of~0.2 mW among all OIHP-based ***,our devices own the lowest power consumption and“set”voltage(0.2 V)among the simplest perovskite-based memory devices(inorganic ones are also included),which are no need to require double metal electrodes or any additional insulating *** also demonstrate repeatable resistance switching behaviour and excellent retention *** envision that 1D OIHPs can enrich the low-dimensional hybrid perovskite library and bring new functions to low-power information devices in the fields of memory and other electronics applications.

关键词： perovskite inorganic crystallization

γ-石墨炔及其衍生物的热电性质:第一性原理计算（英文）

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Chinese Journal of Chemical Physics 2023年第2期 193-198页

作者：孙子娟胡军苏州大学物理科学与技术学院宁波大学物理科学与技术学院

本文基于第一性原理计算研究了两种半导体性的碳同素异形体-γ-石墨炔及其衍生物的电子结构和热电性质.两种材料具有较小的带隙和较长的载流子弛豫时间,有利于热传导.结果表明两种材料中的热电转换效率都相对大,且当载流子浓度为1021cm-... 详细信息

本文基于第一性原理计算研究了两种半导体性的碳同素异形体-γ-石墨炔及其衍生物的电子结构和热电性质.两种材料具有较小的带隙和较长的载流子弛豫时间,有利于热传导.结果表明两种材料中的热电转换效率都相对大,且当载流子浓度为1021cm-3时,在900 K附近达到最大值.研究预示着两种材料有潜力作为热电材料得到应用.

关键词：热电效应碳同素异形体玻尔兹曼输运热电导

γ-石墨炔及其衍生物的热电性质:第一性原理计算

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Chinese Journal of Chemical Physics 2023年第2期36卷 193-198,I0055页

作者：孙子娟胡军苏州大学物理科学与技术学院苏州215006 宁波大学物理科学与技术学院苏州215006

本文基于第一性原理计算研究了两种半导体性的碳同素异形体-个-石墨炔及其衍生物的电子结构和热电性质.两种材料具有较小的带隙和较长的载流子弛豫时间,有利于热传导.结果表明两种材料中的热电转换效率都相对大,且当载流子浓度为1021cm-... 详细信息

本文基于第一性原理计算研究了两种半导体性的碳同素异形体-个-石墨炔及其衍生物的电子结构和热电性质.两种材料具有较小的带隙和较长的载流子弛豫时间,有利于热传导.结果表明两种材料中的热电转换效率都相对大,且当载流子浓度为1021cm-3时,在900K附近达到最大值.研究预示着两种材料有潜力作为热电材料得到应用.

关键词：热电效应碳同素异形体玻尔兹曼输运热电导

Quantum deleting and cloning in a pseudo-unitary system

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Frontiers of physics 2021年第5期16卷 61-67页

作者： Yu-Cheng Chen Ming Gong Peng Xue Hai-Dong Yuan Cheng-Jie Zhang School of Physical Science and Technology Ningbo UniversityNingbo315211China Key Laboratory of Quantum Information University of Science and Technology of ChinaCASHefei230026China Beijing Computational Science Research Center Beijing100084China Department of Mechanical and Automation Engineering The Chinese University of Hong KongHong KongChina School of Physical Science and Technology Soochow UniversitySuzhou215006China

In conventional quantum mechanics,quantum no-deleting and no-cloning theorems indicate that two different and nonorthogonal states cannot be perfectly and deterministically deleted and cloned,***,we investigate the quantum deleting and cloning in a pseudo-unitary *** first present a pseudo-Hermitian Hamiltonian with real eigenvalues in a two-qubit *** using the pseudo-unitary operators generated from this pseudo-Hermitian Hamiltonian,we show that it is possible to delete and clone a class of two different and nonorthogonal states,and it can be generalized to arbitrary two different and nonorthogonal pure qubit ***,state discrimination,which is strongly related to quantum no-cloning theorem,is also *** but not least,we simulate the pseudo-unitary operators in conventional quantum mechanics with post-selection,and obtain the success probability of ***-unitary operators are implemented with a limited efficiency due to the ***,the success probabilities of deleting and cloning in the simulation by conventional quantum mechanics are less than unity,which maintain the quantum no-deleting and no-cloning theorems.

关键词： quantum deleting quantum cloning pseudo-unitary