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Rare Metals 2024年第9期43卷 4612-4619页

作者： Feng Wu Shi-Qi Wang Sebastian Kunze Xiao-Ping Gao pei-qun yin Yu-En Wu Division of Life Sciences and Medicine Department of EndocrinologySchool of Chemistry and Materials ScienceThe First Affiliated Hospital of USTCUniversity of Science and Technology of ChinaHefei 230026China Department of Chemistry Seoul National UniversitySeoul 08826South Korea School of Biomedical Engineering Anhui Medical UniversityHefei 230032China

The electroreduction of carbon dioxide to generate multicarbon products is significant for achieving a carbon-neutral ***,the selectivity for multi-carbon products faces several challenges,such as the intricate nature of the multistep hydrogenation processes,slow reaction kinetics and the bicarbonate precipitate issue caused by alkaline *** factors hinder the extensive utilization of this ***,we successfully developed and implemented a tandem electrolyzer cascade to separate and optimize the complex elementary reactions involved in the process of multi-carbon production.

关键词： reaction. synthesis catalyst

Classifications of Isoparametric Hypersurfaces in Randers Space Forms

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Acta Mathematica Sinica,English Series 2020年第9期36卷 1049-1060页

作者： qun HE pei Long DONG Song Ting yin School of Mathematical Sciences Tongji UniversityShanghai 200092P.R.China Department of Mathematics and Computer Science Tongling UniversityTongling 244000P.R.China Key Laboratory of Applied Mathematics(Putian University) Fujian Province University

In this paper,we give the complete classifications of isoparametric hypersurfaces in Randers space *** studying the principal curvatures of anisotropic submanifolds in a Randers space(N,F)with the navigation data(h,W),we find that a Randers space form(N,F,dμBH)and the corresponding Riemannian space(N,h)have the same isoparametric hypersurfaces,but in general,their isoparametric functions are *** give a necessary and sufficient condition for an isoparametric function of(N,h)to be isoparametric on(N,F,dμBH),from which we get some examples of isoparametric functions.

关键词： Isoparametric hypersurface Randers space form principal curvature anisotropic sub-manifold

Predicting the shrinkage of thermal insulation mortar by probabilistic neural networks

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第3期11卷 212-222页

作者： Yi-qun DENG pei-ming WANG Key Laboratory of Advanced Civil Engineering Materials Ministry of EducationTongji UniversityShanghai 200092China

This study explored the potential of using probabilistic neural networks (PNN) to predict shrinkage of thermal insulation *** results were obtained from the PNN model with the aid of Parzen non-parametric estimator of the probability density functions (PDF).Five variables,water-cementitious materials ratio,content of cement,fly ash,aggregate and plasticizer,were employed for input variables,while a category of 56-d shrinkage of mortar was used for the output variable.A total of 192 groups of experimental data from 64 mixtures designed using JMP7.0 software were collected,of which 120 groups of data were used for training the model and the other 72 groups of data for *** simulation results showed that the PNN model with an optimal smoothing parameter determined by the curves of the mean square error (MSE) and the number of unrecognized probability densities (UPDs) exhibited a promising capability of predicting shrinkage of mortar.

关键词： Mortar Shrinkage Probabilistic neural networks (PNN) Thermal insulation

A PARALLEL NONOVERLAPPING DOMAIN DECOMPOSITION METHOD FOR STOKES PROBLEMS

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Journal of Computational Mathematics 2006年第2期24卷 209-224页

作者： Mei-qun Jiang pei-liang Dai Department of Mathematics Suzhou university Suzhou 215006 China Department of Mathematics Changshu Institute of Technology Changshu 215500 China

A nonoverlapping domain decomposition iterative procedure is developed and analyzed for generalized Stokes problems and their finite element approximate problems in R^N（N=2,3）. The method is based on a mixed-type consistency condition with two parameters as a transmission condition together with a derivative-free transmission data updating technique on the artificial interfaces. The method can be applied to a general multi-subdomain decomposition and implemented on parallel machines with local simple communications naturally.

关键词： Generalized Stokes problem Nonoverlapping Domain decomposition Mixedfinite element Crouzeix-Raviart element.

Eigenvalue Comparison Theorems on Finsler Manifolds

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Chinese Annals of Mathematics,Series B 2015年第1期36卷 31-44页

作者： Songting yin qun HE Department of Mathematics Tongji University Department of Mathematics and Computer Science Tongling University

Cheng-type inequality, Cheeger-type inequality and Faber-Krahn-type inequality are generalized to Finsler manifolds. For a compact Finsler manifold with the weighted Ricci curvature bounded from below by a negative co... 详细信息

关键词： The first eigenvalue Finsler-Laplacian Ricci curvature S-Curvature

The first eigenfunctions and eigenvalue of the p-Laplacian on Finsler manifolds

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Science China Mathematics 2016年第9期59卷 1769-1794页

作者： yin SongTing HE qun Department of Mathematics and Computer Science Tongling University School of Mathematical Sciences Tongji University

This paper proves that the first eigenfunctions of the Finsler p-Lapalcian are C^(1,α). Using a gradient comparison theorem and one-dimensional model, we obtain the sharp lower bound of the first Neumann and closed eigenvalue of the p-Laplacian on a compact Finsler manifold with nonnegative weighted Ricci curvature,on which a lower bound of the first Dirichlet eigenvalue of the p-Laplacian is also obtained.

关键词： the first eigenvalue p-Laplacian Ricci curvature S curvature

A MySQL-Based Software System of Urban Land Planning Database of Shanghai in China

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Computer Modeling in Engineering & Sciences 2023年第6期135卷 2387-2405页

作者： pei yin Jing Cheng Department of Civil Engineering School of Mechanics and Engineering ScienceShanghai UniversityShanghai200444China College of Civil and Transportation Engineering Shenzhen UniversityShenzhen518057China

With the development of the digital city,data and data analysis have become more and more *** database is the foundation of data *** this paper,the software system of the urban land planning database of Shanghai in China is developed based on *** conceptual model of the urban land planning database is proposed,and the entities,attributes and connections of this model are *** the E-R conceptual model is transformed into a logical structure,which is supported by the relational databasemanagement system(DBMS).Based on the conceptual and logical structures,by using Spring Boot as the back-end framework and using MySQL and Java API as the development tools,a platformwith datamanagement,information sharing,map assistance and other functions is *** functionalmodules in this platformare *** results of J Meter test show that the DBMS can add,store and retrieve information data stably,and it has the advantages of fast response and low error *** software system of the urban land planning database developed in this paper can improve the efficiency of storing and managing land data,eliminating redundant data and sharing data.

关键词： Software database database management system urban land planning MySQL

Self-Detection of Leaking Pipes by One-Dimensional Photonic Crystals

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Chinese Physics Letters 2012年第6期29卷 172-174页

作者： ZHOU Yan yin Li-qun Department of Physics Yanshan UniversityQinhuangdao 066004 Educational Administration Hebei Normal University of Science and TechnologyQinhuangdao 066004

We report a new self-detection control system for leaking pipes by making use of the surface defects of 1D photonic crystals,where the key concept is analog to the Bragg fiber *** current low costs and coating techniques of SiO2 are beneficial to the applications,and its error is below the standard *** problem of leaking pipes can be resolved by devising a remote pipeline control system which combines a long-distance pipeline and a signal transmission system.

关键词： fiber Crystal pipes

Polyelectrolytes of Inorganic Polyoxometalates:Prospecting New Charged Polymers for Advanced Applications

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Chinese Journal of Polymer Science 2024年第9期42卷 1254-1269,I0005页

作者： De-yin Wang Zhuo-qun Lu Wei Wang College of Medical Linyi UniversityLinyi276000China Center for Synthetic Soft Materials Key Laboratory of Functional Polymer Materials of the Ministry of EducationInstitute of Polymer ChemistryNankai UniversityTianjin300071China

Polyelectrolytes are charged polymers comprising macromolecules in which substantial portions of the constituent units contain cationic(e.g.,pyridinium,ammonium)or anionic(e.g.,sulfonate,carboxylate)groups,which possess special functions from the features of counterions,such as dissociation to charged species,mechanical stability,phase behavior,***,functional polyelectrolytes have been widely applied in many *** this perspective,we present some progresses in the studies of poly(polyoxometalate)s,denoted as poly(POM)s,as a kind of new charged polymers/polyelectrolytes,by covalent bonding between the inorganic polyoxometalate(POM)clusters and the organic polymer *** to the distinct positions of POMs in polymer chain and functions of poly(POM)s,they are divided into the following four categories:crosslinked poly(POM);side-chain poly(POM);backbone poly(POM),including poly(POM)-conjugated polymer hybrid and block poly(POM)-polymer;and POM-based covalent organic framework(PCOF).This perspective introduces the synthesis methods of poly(POM)polyelectrolytes and their macromolecular and aggregate structural characteristics,while also focusing on their properties and *** application areas include catalysis,thermal resistance,optical functions,fuel cells and batteries,etc.

关键词： Charged polymer Polyelectrolyte Polyoxometalate Poly(polyoxometalate) Covalent organic framework

Preparation of crystalline rare earth carbonates with large particle size from the lixivium of weathered crust elution-deposited rare earth ores

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International Journal of Minerals,Metallurgy and Materials 2020年第11期27卷 1482-1488页

作者： Jing-qun yin Zhi-qiang Zou Jun Tian Institute of Applied Chemistry Jiangxi Academy of SciencesNanchang 330029China School of Resource and Environmental Engineering Jiangxi University of Science and TechnologyGanzhou 341000China

Crystalline rare-earth(RE)carbonates having large particle size were prepared from the lixivium of weathered crust elution-deposited rare-earth ores using the precipitation method with ammonium bicarbonate as the *** chemical composition was studied using elemental and thermogravimetric analyses(TGA),and their structure and morphology were characterized using Fourier transform infrared(FTIR)spectroscopy,X-ray diffraction(XRD),and scanning electron microscopy(SEM).The results demonstrate that the crystalline rareearth carbonate is a hydrated basic carbonate or oxycarbonate and not astable intermediate carbonate in the process of thermal *** particle size of crystalline rare-earth carbonates with large particle size is in the range of 50–200μ*** an RE2O3 content of up to 95wt%,the quality of crystalline rare-earth carbonates is higher compared to the Chinese National Standard(GB/T 28882–2012).The quality of the product is superior to the Chinese National Standard.

关键词： rare-earth ores precipitation crystalline rare-earth carbonate large particle size