检索结果-南通市图书馆

Atomically precise metal chalcogenide supertetrahedral clusters:frameworks to molecules,and structure to function

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

National Science Review 2022年第1期9卷 128-143页

作者： jiaxu zhang Pingyun Feng Xianhui Bu Tao Wu College of Chemistry Chemical Engineering and Material Science Soochow University Department of Chemistry University of California College of Chemistry and Materials Science Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications Jinan University Department of Chemistry and Biochemistry California State University

Metal chalcogenide supertetrahedral clusters(MCSCs) are of significance for developing crystalline porous framework materials and atomically precise cluster *** research interest focused on the synthetic and structural chemistry of MCSC-based porous semiconductor materials with different cluster sizes/compositions and their applications in adsorption-based separation and *** recently,focus has shifted to the cluster chemistry of MCSCs to establish atomically precise structure-composition-property relationships,which are critical for regulating the properties and expanding the applications of ***,MCSCs are similar to Ⅱ-Ⅵ or Ⅰ-Ⅲ-Ⅵ semiconductor nanocrystals(also called quantum dots,QDs) but avoid their inherent size polydispersity and structural ***,discrete MCSCs,especially those that are solution-processable,could provide models for understanding various issues that cannot be easily clarified using *** review covers three decades of efforts on MCSCs,including advancements in MCSC-based open frameworks(reticular chemistry),the precise structure-property relationships of MCSCs(cluster chemistry),and the functionalization and applications of MCSC-based micro *** outlook on remaining problems to be solved and future trends is also presented.

关键词： metal chalcogenide nanocluster open framework semiconductor reticular chemistry atomically precise nanochemistry

Slippery Surface with Petal-like Structure for Protecting Al Alloy: Anti-corrosion, Anti-fouling and Anti-icing

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2022年第1期19卷 83-91页

作者： Junfei Huang Jiajie Kang jiaxu zhang Jinxia Huang Zhiguang Guo School of Engineering and Technology China University of GeosciencesBeijing100083China Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials Hubei UniversityWuhan430062China State Key Laboratory of Solid Lubrication Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China Zhengzhou Institute China University of Geosciences(Beijing)Zhengzhou451283China

The harsh working environment affects the performance and usage life of Al and its alloys,thus limiting their *** recent years,Slippery Liquid-infused Porous Surface(SLIPS)has attracted much attention due to excellent anti-corrosion,anti-fouling and anti-icing *** may be an effective way to improve the properties of Al and its ***,the SLIPS with petal-like structure was constructed on the Al alloy via simple hydrothermal reaction,Stearic Acid(STA)modification and lubricant injection.A variety of droplets(including oil-in-water emulsions)can slide on the SLIPS at a low angle,even the Sliding Angle(SA)of the water droplet is only 3°.Furthermore,the SLIPS exhibits outstanding mechanical and chemical *** can maintain fine oil-locking ability under high shearing force and keep slippery stability after immersion in acid/alkaline *** addition,the SLIPS possesses excellent anti-corrosion,anti-fouling and anti-icing properties,which provides a new way to promote the application of Al and its ***,the SLIPS is expected to be an effective way to improve the properties of Al and its alloys,as well as play a role in anti-fouling and self-cleaning in construction,shipbuilding and automotive manufacturing industries,thereby expanding the practical application of Al and its alloys.

关键词： Slippery surface Al alloy Anti-corrosion Anti-fouling Anti-icing

Permeable and robust polymer-silica hybrid armor on cell catalyst for sustainable biomanufacturing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Particuology 2024年第9期92卷 106-112页

作者： Yiran Cheng Zhenhua Wu Boyu zhang jiaxu zhang Jiafu Shi Zhongyi Jiang School of Environmental Science and Engineering Tianjin UniversityTianjin300072China Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin300072China

Inactivated cell catalysis is one of several central techniques in green biomanufacturing ***,the instability and leakage of enzymes in inactivated cell severely restrict the practical applications of inactivated cell *** armor on the surface of inactivated cells affords a feasible and effective strategy to enhance the stability of cells while commonly lowering the ***,polymer-silica hybrid armor(PSHA)is directly generated on the surface of enzyme-containing *** branched structure of PEI enables higher porosity of cell@PSHA,exhibiting 1.52-fold enhancement in substrate permeability by contrast with cell@silica armor(SA).The electrostatic interactions(NH_(3)^(+)with O^(−))and hydrogen bonding(N⋯H or O⋯H)interactions between structural units enables higher stability of cell@PSHA,showing 3.13-fold elevation in Young's modulus compared with cell@*** a result,the cell@PSHA can catalyze continuous conversion of starch to tagatose for 15 batches over 969 h,with an average yield of 77.76 g L^(−1).

关键词： Biomanufacturing Wholecell catalysis Polymer-silica hybrid armor Tagatose production Starch conversion

LSTM based prediction algorithm and abnormal change detection for temperature in aerospace gyroscope shell

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Intelligent Computing and Cybernetics 2019年第2期12卷 274-291页

作者： Haoqiang Shi Shaolin Hu jiaxu zhang School of Automation and Information Engineering Xi’an University of TechnologyXi’anChina Automation School Guangdong University of Petrochemical TechnologyMaomingChina

Purpose–Abnormal changes in temperature directly affect the stability and reliability of a *** the temperature and detecting the abnormal change is great value for timely understanding of the working state of the *** that the actual collected gyroscope shell temperature data have strong non-linearity and are accompanied by random noise pollution,the prediction accuracy and convergence speed of the traditional method need to be *** purpose of this paper is to use a predictive model with strong nonlinear mapping ability to predict the temperature of the gyroscope to improve the prediction accuracy and detect the abnormal ***/methodology/approach–In this paper,an double hiddenlayer long-shortterm memory(LSTM)is presentedto predicttemperature data for the gyroscope(including singlepoint andperiod prediction),and the evaluation index of the prediction effect is also proposed,and the prediction effects of shell temperature data are compared by BP network,support vector machine(SVM)and LSTM *** the estimated value detects the abnormal change of the ***–By combined simulation calculation with the gyroscope measured data,the effect of different network hyperparameters on shell temperature prediction of the gyroscope is analyzed,and the LSTM networkcan beusedto predictthe temperature(timeseriesdata).Bycomparingthe performance indicatorsof different prediction methods,the accuracy of the shell temperature estimation by LSTM is better,which can meet the requirements of abnormal change *** and accurate diagnosis of different types of gyroscopefaults(stepsanddrifts)can ***–The LSTMmodelisa deepneuralnetworkmodelwithmultiplenon-linearmapping levels,and can abstract the input signal layer by layer and extract features to discover deeper underlying *** improved method has been used to solve the problem of strong

关键词： Gyroscope LSTM Temperature prediction Recurrent neural network Abnormal change detection

Chemical Dynamics Simulations of the Hydroxyl Radical Reaction with Ethene

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 Physics 2013年第6期26卷 765-773,I0005页

作者： jiaxu zhang Li Yang Diego Troya Beijing National Laboratory for Molecular Sciences Institute of Chemistry Chinese Academy ofSciences Beifing 100190 China Technical Institute of Physics and Chemistry Chinese Academy of Sciences Beijing 100190 China Department of Chemistry Virginia Tech Blacksburg VA 24051 USA

We present a theoretical study of the reaction of the hydroxyl radical with ethene using electronic structure calculations and direct-dynamics simulations. High-accuracy electronic structure calculations at the CCSD（T）/aug-cc-pVTZ//MP2/aug-ce-pVDZ level have been carried out to characterize the representative regions of the potential energy surface of various reaction pathways, including OH-addition and H-abstraction. These ab initio calculations have been employed to derive an improved set of parameters for the MSINDO semiempirieal Hamiltonian specific to the OH＋C2H4 reaction. The specific-reaction-parameter Hamilto- nian captures the ab initio data accurately, and has been used to perform direct quasiclassica] trajectory simulations of the OH＋C2H4 reaction at collision energies in the range of 2-10 kcal/mol. The calculated cross sections reveal that the OH-addition reaction domi- nates at all energies over H-abstraction. In addition, the excitation function of addition is reminiscent of a barrierless capture process, while that for abstraction corresponds to an activated one, and these trends can be connected to the transition-state energies of both reactions. We note that the development of an accurate semiempirical Hamiltonian for the OH＋C2H4 reaction in this work required the inclusion of empirical dispersion corrections, which will be important in future applications for which long-range intermoleeular attraction becomes significant.

关键词： QCT SRP Hamiltonian MSIND0 Hydroxyl Ethene

Transformation of Undesired Li_(2)CO_(3)into Lithiophilic Layer Via Double Replacement Reaction for Garnet Electrolyte Engineering

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Energy & Environmental Materials 2022年第3期5卷 962-968页

作者： jiaxu zhang Ruohan Yu Jun Li Huiyu Zhai Gangjian Tan Xinfeng Tang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China International School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

Garnet-type solid-state electrolytes(SSEs)are a remarkable Li-ion electrolyte for the realization of next-generation all-solid-state lithium batteries due to their excellent stability against Li metal as well as high ionic conductivities at room ***,garnet electrolytes always contain undesired and hardly removable Li_(2)CO_(3) contaminations that have persistently large resistance and unstable interface contact with Li *** is a critical bottleneck for the practical application of garnet ***,we design a novel strategy to completely root out Li_(2)CO_(3) both inside and on the surface of *** is achieved by a so-called double replacement reaction between Li_(2)CO_(3) and SiO_(2) during one-step hot press process for garnet electrolyte *** leads to in-situ transformation of LixSiOy(LSO)mostly locating around the grain boundaries of *** to the higher ion conductivity and better electrochemistry stability of LSO than Li_(2)CO_(3),the modified garnet electrolyte shows much improved electrochemical ***,the wettability between modified garnet electrolyte and lithium metals was significantly enhanced in the absence of surface Li_(2)CO_(3).As a proof of concept,an assembled Li symmetric cell with modified garnet electrolyte displays a high critical current density(CCD)of 0.7 mA cm^(-2)and a low interfacial impedance(5Ωcm^(2))at 25℃.These results indicate that the upcycling of Li_(2)CO_(3)is a promising strategy to well-address the degradation and interfacial issue associated with garnet electrolytes.

关键词： double replacement reaction garnet electrolytes lithiophilic layer solid-state lithium batteries

Energy Transfer of Peptide Ions Colliding with a Self-Assembled Monolayer Surface. The Influence of Peptide Ion Size

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 2019年第3期37卷 237-243页

作者： Meng Gu Li Yang William L Hase Jianmin Sun jiaxu zhang MlIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbinHeilongjiang 150001China Department of Chemistry and Biochemistry Texas Tech UniversityLubbockTX79401USA

Summary of main observation and conclusion Atomistic dynamics of protonated polyglycine, glyn-H^+(n = 3, 5, and 7), colliding with a fluorinated octanethiol self-assembled monolayer (F-SAM) surface has been studied by trajectory calculations. The effects of peptide size on the collision processes and energy transfer efficiencies are emphasized and discussed in detail. The simulations show that the fraction of trapping, which is related to the soft-landing process, dramatically drops with the in crease in collisi on energy, but gently increases with the peptide size. The average energy transfer to the peptide ion's internal degrees of freedom, AEint, is compared with previous experiments. The limiting probability Po of energy transfer to the surface is given by fitting a function of Poexp(—b/&). Our results suggest that the efficiencies of energy transfer are less dependent on the masses, even the categories of the peptide ions, and are determined by the character of the surfaces.

关键词： Energy Transfer Peptide Ions Colliding

Dendrimer-induced synthesis of porous organosilica capsules for enzyme encapsulation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2024年第4期18卷 41-48页

作者： Ziyi Chu Boyu zhang Zhenhua Wu jiaxu zhang Yiran Cheng Xueying Wang Jiafu Shi Zhongyi Jiang School of Environmental Science&Engineering Tianjin UniversityTianjin 300072China Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300072China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Key Laboratory for Green Chemical Technology of Ministry of Education School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300072China

Organic matter-induced mineralization is a green and versatile method for synthesizing hybrid nanostructured materials,where the material properties are mainly influenced by the species of natural biomolecules,linear synthetic polymer,or small molecules,limiting their ***,we adopted dendrimer poly(amidoamine)(PAMAM)as the inducer to synthesize organosilica-PAMAM network(OSPN)capsules for mannose isomerase(MIase)encapsulation based on a hard-templating *** structure of OSPN capsules can be precisely regulated by adjusting the molecular weight and concentration of PAMAM,thereby demonstrating a substantial impact on the kinetic behavior of the MIase@OSPN *** MIase@OSPN system was used for catalytic production of mannose from Dfructose.A mannose yield of 22.24% was obtained,which is higher than that of MIase in organosilica network capsules and similar to that of the free *** overall catalytic efficiency(kcat/Km)of the MIase@OSPN system for the substrate D-fructose was up to 0.556 s^(-1)·mmol^(-1)·***,the MIase@OSPN system showed excellent stability and recyclability,maintaining more than 50% of the yield even after 12 cycles.

关键词： enzyme immobilization enzyme catalysis organosilica networks capsules sugar biosynthesis

A spatial attentive and temporal dilated(SATD)GCN for skeleton-based action recognition

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CAAI Transactions on Intelligence Technology 2022年第1期7卷 46-55页

作者： jiaxu zhang Gaoxiang Ye Zhigang Tu Yongtao Qin Qianqing Qin Jinlu zhang Jun Liu State Key Laboratory of Information Engineering in Surveying Mapping and Remote SensingWuhan UniversityWuhanChina State Grid Wuhan Power Supply Company WuhanChina Shenzhen Infinova Ltd.Company ShenzhenChina Information Systems Technology and Design Pillar Singapore University of Technology and DesignSingapore

Current studies have shown that the spatial-temporal graph convolutional network(STGCN)is effective for skeleton-based action ***,for the existing STGCN-based methods,their temporal kernel size is usually fixed over all layers,which makes them cannot fully exploit the temporal dependency between discontinuous frames and different sequence ***,most of these methods use average pooling to obtain global graph feature from vertex features,resulting in losing much fine-grained information for action *** address these issues,in this work,the authors propose a novel spatial attentive and temporal dilated graph convolutional network(SATD-GCN).It contains two important components,that is,a spatial attention pooling module(SAP)and a temporal dilated graph convolution module(TDGC).Specifically,the SAP module can select the human body joints which are beneficial for action recognition by a self-attention mechanism and alleviates the influence of data redundancy and *** TDGC module can effectively extract the temporal features at different time scales,which is useful to improve the temporal perception field and enhance the robustness of the model to different motion speed and sequence ***,both the SAP module and the TDGC module can be easily integrated into the ST-GCN-based models,and significantly improve their *** experiments on two large-scale benchmark datasets,that is,NTU-RGB+D and Kinetics-Skeleton,demonstrate that the authors’method achieves the state-of-the-art performance for skeleton-based action recognition.

关键词： classification. skeleton action