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Synthesis of Tin Oxide Through Thermal Decomposition of Sn_2(NH_4)_2(C_2O_4)_3 and Its Gas Sensing Property

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Chemical Research in Chinese Universities 2005年第6期21卷 641-645页

作者： shi Juan WU shi-hua WANG Shu-rong School of Materials Science and Chemical Engineering Tianjin Polytechnic University Tianjin 300160 P. R. China Department of Chemistry Nankai University Tianjin 300071 P. R. China

Nanocrystalline tin oxide samples were prepared by using Sn2 （NH4 ）2 （C2O4）3 as the precursor. The thermal decompositions were respectively conducted at 250,450 and 650 ℃. TG-DTA, XRD, TEM, FTIR were used to characterize the samples. The indirect heating sensors by using these materials as sensitive bodies were fabricated on an alumina tube with Au electrodes and platinum wires. Sensing properties of these sensors were investigated. It was found that the tin oxide sample obtained by thermal decomposition at 450 ℃ has a higher sensitivity to C2H5OH and a higher selectivity to hexane and ammonia than those obtained via the conventional precipitate method and the working temperatures needed were greatly decreased.

关键词： Tin dioxide Thermal decomposition Gas sensing property Selectivity

Promoting nitric oxide electroreduction to ammonia over electron-rich Cu modulated by Ru doping

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Science China Chemistry 2021年第9期64卷 1493-1497页

作者： Jiangwei shi Changhong Wang rong Yang Fanpeng chen Nannan Meng Yifu Yu Bin Zhang Department of Catalysis Science and Engineering School of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China Institute of Molecular Plus School of ScienceTianjin UniversityTianjin300072China

Electrocatalytic nitric oxide(NO)reduction is a promising strategy to produce *** a facile approach to synthesize efficient catalysts with enhanced NO electroreduction performance is highly ***,a series of Ru-doped Cu materials are constructed through in situ electroreduction of corresponding metal *** optimized Ru_(0.05)Cu_(0.95)exhibits superior electrocatalytic performance for ammonia synthesis by using NO/Ar(1/4,n/n)as the feedstocks(Faradaic efficiency:64.9%,yield rate:17.68μmol cm^(-2)h^(-1)),obviously outperforming Cu counterpart(Faradaic efficiency:33.0%,yield rate:5.73μmol cm^(-2)h^(-1)).Electrochemical in situ Fourier transform infrared(FTIR)spectroscopy and online differential electrochemical mass spectrometry(DEMS)are adopted to detect intermediates and unveil the possible reaction *** downshift of the Cu d-band center induced by Ru doping facilitates the rate-limiting hydrogenation step and decreases the desorption energy of NH_(3),leading to high Faradaic efficiency and yield of ammonia.

关键词： Electrocatalysis NO ammonia synthesis in situ characterizations Ru-doped Cu

Disruption of key GTPase regulators of endocytic recycling compartment does not interfere with soluble antigen crosspresentation in dendritic cells

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Cellular & Molecular Immunology 2016年第4期13卷 554-556页

作者： Hua rong Yan shi Department of Basic Medical Sciences School of Medicine Tsinghua-Peking Center for Life Sciences Tsinghua University Beijing China Department of Microbiology Immunology & Infectious Diseases and Snyder Institute University of Calgary Calgary Alberta Canada

Crosspresentation is of vital significance to immune surveillance. External antigens, soluble or solid, enter cells via endo-phagocytic vesicles and are eventually delivered to MHC class I molecules on the cell surface. After antigen uptake, there are three proposed pathways leading to surface MHC class I/peptide complex presentation. Direct translocation into the cytosol to use the conventional proteasome/TAP-dependent ER peptide loading; phagosome autonomous presentation following fusion with selected ER components; and endocytic recycling whereby antigens are processed within the endosome and form a complex with internalized MHC class I, for redelivery back to cell surface. Endocytic recycling compartment (ERC), a major perinuclear tubular network considered critical for slow endosomal recycling, has been suggested to be one route for crosspresentation. This pathway is particularly relevant for soluble antigen presentation, as the former two routes are mostly used to describe particulate antigen processing, involving phagosomes. Here we report the unexpected finding that disruption of key regulatory factors of ERC, small GTPase proteins ARF6,Rabl la, and Rab22a, had no effect on soluble ovalbumin (OVA) crosspresentation in a model dendritic cell system.

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A Study on the Influence of Social Media Use on Psychological Anxiety among Young Women

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International Journal of Mental Health Promotion 2024年第3期26卷 199-209页

作者： Tao Liu Huiyin shi chen chen rong Fu Department of Sociology Hangzhou Dianzi UniversityHangzhou310018China College of Economics Hangzhou Dianzi UniversityHangzhou310018China

To explore the relationship between social influence,social comparison,clarity of self-concept,and psychological anxiety among young women during their usage of social networking sites,our study selected 338 young women aged 14-34 from the social site platforms of Little Red Book and Weibo for questionnaire *** Passive Social Network Utilization Scale,Social Comparison Scale(SCS),Social Influence Questionnaire,Self-Concept Clarity Scale(SCCS),and Generalized Anxiety Disorder Scale(GAD-7)were employed to measure the *** results show that the frequency of passive social media use is positively related to the level of psychological *** comparison,social influence,and unclear self-concepts under social media use are negatively predictive of psychological *** chain mediation effects indicate that social comparison and social influence under social media use negatively predict the clarity of self-concept,thus having a negative impact on the psychological health of young ***,young women should strengthen their self-concepts,control their frequency of social media usage,avoid addiction,and pay special attention to their frequency of passive use,in order to protect their psychological *** study provides some practical implications and insights regarding the relationship between young women’s social media use and psychological health.

关键词： Social media young women mental health social comparison and influence clear self-concept

Mixed Hierarchical Networks for Deep Entity Matching

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Journal of Computer Science & Technology 2021年第4期36卷 822-838页

作者： chen-chen Sun De-rong Shen Engineering Research Center of Learning-Based Intelligent System(Ministry of Education)Tianjin University of Technology Tianjin 300384China School of Computer Science and Engineering Tianjin University of TechnologyTianjin 300384China School of Computer Science and Engineering Northeastern UniversityShenyang 110819China

Entity matching is a fundamental problem of data *** groups records according to underlying real-world *** is a growing trend of entity matching via deep learning *** design mixed hierarchical deep neural networks(MHN)for entity matching,exploiting semantics from different abstract levels in the record internal hierarchy.A family of attention mechanisms is utilized in different periods of entity ***-attention focuses on internal dependency,inter-attention targets at alignments,and multi-perspective weight attention is devoted to importance ***,hybrid soft token alignment is proposed to address corrupted *** order is for the first time considered in deep entity ***,to reduce utilization of labeled training data,we propose an adversarial domain adaption approach(DA-MHN)to transfer matching knowledge between different entity matching tasks by maximizing classifier ***,we conduct comprehensive experimental evaluations on 10 datasets(seven for MHN and three for DA-MHN),which illustrate our two proposed approaches1 *** apparently outperforms previous studies in accuracy,and also each component of MHN is ***-MHN greatly surpasses existing studies in transferability.

关键词： entity matching attention mechanism mixed hierarchical neural network(MHN) domain adaption data integration

CFD Simulation of a container ship in random waves using a coupled level-set and volume of fluid method

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Journal of Hydrodynamics 2023年第2期35卷 222-231页

作者： Hamn-Ching chen Chia-rong chen Zachry Department of Civil and Environmental Engineering Texas A&M UniversityCollege StationTexasUSA

The coupled level-set and volume of fluid(CLSVOF)method is an advanced interface-capturing method that has been extended to handle overset grid ***,artificial uneven interface may be observed across block boundaries of different sizes and *** present an improved inter-grid VOF interpolation and mass correction scheme to address the *** demonstrate the capability of the improved CLSVOF method,it is applied to the simulation of a container ship in pitch and heave motions under both head sea and following sea irregular wave *** simulation proves that the improved CLSVOF method is capable of revealing detailed physics difficult to see with other *** phenomena simulated in our work include the extensive greenwater propagation on the ship deck,the breakup of overtopping waves into small droplets,and the formation and collapse of air pockets in sudden bow and stern slamming which cause strong and highly localized impacts on the ship bow,stern,and rudder.

关键词： Computational fluid dynamics(CFD) couple level-set and volume of fluid(CLSVOF)method random waves overset grid system violent free surface flow bow and stern slamming

In situ polymerization of 1,3-dioxolane infiltrating 3D garnet framework with high ionic conductivity and excellent interfacial stability for integrated solid-state Li metal battery

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Rare Metals 2022年第11期41卷 3694-3705页

作者： Lin-Hui chen Ze-Ya Huang shi-Le chen rong-Ao Tong Hai-Long Wang Gang Shao Chang-An Wang State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China College of Materials Science and Technology Nanjing University of Aeronautics and AstronauticsNanjing210016China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China

The polymer-ceramic composite electrolyte is considered as one of promising electrolytes for solid-state ***,in previous research,ceramic particles are usually dispersed in polymer matrix and could not form continuous Li+conductive *** agglomeration of ceramic particles could also lead to low ionic conductivity and poor interfacial electrode/electrolyte *** this paper,self-supported porous Li_(6.4)La_(3) Zr_(1.4)Ta_(0.6)O_(12)(LLZTO) electrolyte is synthesized by gelcasting process,which possesses three-dimensional(3D) interconnected pore channels and relatively high *** 1,3-dioxolane(DOL) could penetrate into the porous LLZTO framework for its excellent *** subsequent in situ polymerization process by thermal treatment could completely fill the internal pores and improve the interfacial contact with *** resulting 3D composite electrolyte with dual continuous Li+transport channels in ceramic and polymer components exhibits high ionic conductivity of 2.8 × 10^(-4) S·cm^(-1) at room temperature and low Li/electrolyte interfacial resistance of 94 Ω·cm^(2) at 40 ℃.The corresponding Li/Li symmetric cell delivers stable voltage profiles for over 600 h under 0.1 and 0.2 mA·cm^(-2).The solid-state Li/LiFePO_(4) battery shows superior rate and cycling performance under 0.1 C and 0.2 *** work guides the preparation of composite electrolyte with dual continuous Li+conductive paths as well as high ceramic ratio and interface modification strategy for solid-state Li metal battery.

关键词： Garnet electrolyte 1,3-dioxolane(DOL) In situ polymerization Three-dimensional(3D)composite electrolyte Continuous Li^(+)conductive channel

Grain dehydration rate is related to post-silking thermal time and ear characters in different maize hybrids

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Journal of Integrative Agriculture 2022年第4期21卷 964-976页

作者： shi Wen-jun SHAO Hui SHA Ye shi rong shi Dong-feng chen Ya-chao BAN Xiang-ben MI Guo-hua The Key Lab of Plant–Soil Interaction Ministry of Education/National Academy of Agriculture Green Development/College of Resources and Environmental ScienceChina Agricultural UniversityBeijing 100193P.R.China

Mechanized grain harvest of maize becomes increasingly important with growing land plot size in Northeast China. Grain moisture is an important factor affecting the performance of mechanized grain harvest. However, it remains unclear what influences grain dehydration rate. In this study, maize grain dehydrating process was investigated in a two-year field experiment with five hybrids under two planting densities in 2017 and 2018. It was found that damaged-grain ratio was the main factor affecting mechanized harvest quality, and this ratio was positively correlated with grain moisture content at harvest(R^(2)=0.6372, Pship between GDDs and grain moisture still existed, but the correlation coefficient became smaller(r=-0.8267, P<0.01). At this stage, grain dehydrating process was greatly affected by genotypes. Grain dehydrated faster when a hybrid has a smaller husk area(r=0.6591, P<0.05), larger ear angle(r=-0.7582, P<0.05), longer ear peduncle(r=-0.9356, P<0.01) and finer ear(r=0.9369, P<0.01). These parameters can be used for breeders and farmers to select hybrids suitable for mechanized grain harvest.

关键词： maize grain moisture grain dehydrating grain damage mechanized harvest ear traits genotype

Ammonium Ion Motion and Phase Transitions in(ND_(4))_(2)TeCl_(6) Studied by Raman Scattering

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Chinese Physics Letters 1996年第1期13卷 58-61页

作者： shi Jin-rong MULLER S ARNSCHEIDT B PELZL J XU Yong-chen WU Xiang Pohl Institute of Solid State Physics Tongji UniversityShanghai 200092 Institute fur ExperimentalphysikⅢ AG Festkorperspektroskopiej Ruhr-UniversiBochum44780 BochumF.R.G.P.O.Box 102148 International Center for Materials Physics Academia SinicaShenyang 110015

The interna.1 vibrations of the ammonium ion in(ND_(4))_(2) TeCl_(6) have been studied by Raman scattering in the temperature range 4.2-300 *** tings of A_(1)-,E-,and T_(2)-modes have been o bserved at T_(c2)=48K and T_(c3)=28 *** split tings were well interpreted by group theoretical correlation *** reason for the transitions at T_(c2) and T_(c3) may be the decrease of the force constant in the deuterated ammonium ion.

关键词： Transition ammonium (4)