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A compressing and saving method for structured grid data based on block construction

Chinese Journal of Aeronautics 2022年第6期35卷 146-155页

作者： Yan SUN Ying ZHAO Dehong meng meng jiang State Key Laboratory of Aerodynamics China Aerodynamics Research and Development CenterMianyang 621000China Computational Aerodynamics Institute China Aerodynamics Research and Development CenterMianyang 621000China

The increasing grid data in CFD simulation has brought some new difficulties and challenges,such as high storage cost,low transmission *** order to overcome these problems,a novel method for compressing and saving the structured grid are *** the present method,the geometric coordinates of the six logical domains of one grid block is saved instead of all grid vertex coordinates to reduce the size of the structured grid file when the grid is *** all grid vertex coordinates are recovered from the compressed data with the use of the transfinite interpolation algorithm when the grid is ***,single-block grid cases with different edge vertexes are tested to investigate the compression *** test results show that a higher compression ratio will be obtained on a larger ***,further theoretical analysis is carried out to investigate the effects of parameters on grid *** analysis on single-block grid compression shows that the compression ratio is proportionate to the cubic root of the number of total *** highest compression ratio of single-block grid is obtained when the numbers of vertexes in three logical directions are *** analysis on multi-block grid compression shows that a higher compression ratio will be obtained when a larger difference of total vertexes number exists among the grid ***,multi-blockgrids of two industrial aircraft configurations are compressed to validate the *** compression results demonstrate that the present method has an excellent ability on structured grid *** a million-vertex structured grid,more than 80 percent disk space can be saved after compression.

关键词： CFD Compression Compression ratio Structured grid Transfinite interpolation

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Output Feedback Stabilization of High-Order Nonlinear Time-Delay Systems With Low-Order and High-Order Nonlinearities

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IEEE/CAA Journal of Automatica Sinica 2024年第5期11卷 1304-1306页

作者： meng-meng jiang Kemei Zhang Xue-Jun Xie School of Mathematics Science Liaocheng UniversityLiaocheng 252059China School of Mathematics Science Qufu Normal UniversityQufu 273165China Institute of Automation Qufu Normal UniversityQufu 273165China

Dear Editor,to This letter deals with the output feedback stabilization of a class of high-order nonlinear time-delay systems with more general low-order and high-order *** constructing reduced-order observer,based on homogeneous domination theory together with the adding a power integrator method,an output feedback controller is developed guarantee the equilibrium of the closed system globally uniformly asymptotically stable.

关键词： Nonlinear stabilization guarantee

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Superior printed parts using history and augmented machine learning

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npj Computational Materials 2022年第1期8卷 1736-1745页

作者： meng jiang Tuhin Mukherjee Yang Du Tarasankar DebRoy State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin150001China Department of Materials Science and Engineering The Pennsylvania State UniversityUniversity ParkPA16802USA

Machine learning algorithms are a natural fit for printing fully dense superior metallic parts since 3D printing embodies digital technology like no other manufacturing *** traditional machine learning needs a large volume of reliable historical data to optimize many printing variables,the algorithm is augmented with human intelligence derived from the rich knowledge base of metallurgy and physics-based *** augmentation improves the computational efficiency and makes the problem tractable by enabling the algorithm to use a small set of *** provide a verifiable quantitative index for achieving fully dense superior parts,facilitate material selection,uncover the hierarchy of important variables that affect the density,and present easy-to-use visual process *** findings can improve the quality consistency of 3D printed parts that now limit their greater industrial *** approach used here can be applied to solve other problems of 3D printing and beyond.

关键词： printing augmented consistency

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Mechanical anisotropy and electronic properties of X2N2(XH2):first-principles calculations

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Communications in Theoretical Physics 2020年第11期72卷 109-120页

作者： Xiao-Zhen Li meng-jiang Xing Department of Information and Technology Kunming UniversityKunming650214China State Key Laboratory of Electronic Thin Films and Integrated Devices University of Electronic Science and Technology of ChinaChengdu610054China

The mechanical anisotropy,structural properties,electronic band structures and thermal properties of C2N2(CH2),Si2N2(SiH2)and Ge2N2(GeH2)are detailed and investigated in this *** novel silicon nitride phase Si2N2(SiH2)and germanium nitride phase Ge2N2(GeH2)in the Cmc21 structure are proposed in this *** novel proposed Si2N2(SiH2)and Ge2N2(GeH2)are both mechanically and dynamically *** electronic band calculation of the HSE06 hybrid functional shows that C2N2(CH2),Si2N2(SiH2)and Ge2N2(GeH2)are all wide band gap semiconductor materials,and C2N2(CH2)and Si2N2(SiH2)are direct band gap semiconductor materials,while Ge2N2(GeH2)is a quasi-direct band gap semiconductor material,the band gap of C2N2(CH2),Si2N2(SiH2)and Ge2N2(GeH2)are 5.634 eV,3.013 eV,and2.377 eV,*** three-dimensional and plane distributions of Young’s modulus,shear modulus and Poisson’s ratio of C2N2(CH2),Si2N2(SiH2)and Ge2N2(GeH2)show that these materials have different degrees of mechanical *** order of Young’s modulus of Si2N2(SiH2)and Ge2N2(GeH2)in different directions is different from that of C2N2(CH2).When the tensile axis is in a particular direction,the order of the Young’s modulus of Si2N2(SiH2):E[110]

关键词： X2N2(XH2) mechanical anisotropy wide band gap semiconductor Young’s modulus

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TICKET attracts pollen tubes and mediates reproductive isolation between relative species in Brassicaceae

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Science China(Life Sciences) 2019年第11期62卷 1413-1419页

作者： jiang-Guo meng meng-Xia Zhang Wei-Cai Yang Hong-Ju Li State Key Laboratory of Molecular Developmental Biology Institute of Genetics and Developmental BiologyChinese Academy of SciencesBeijing 100101China Collage of Advanced Agricultural Sciences University of Chinese Academy of SciencesBeijing 100049China

In flowering plants,pollen tubes are attracted to the ovule by secreted peptides to release the sperm cells for double *** process is species-specific and acts as an important stage of reproductive isolation between *** we identified a cysteine-rich peptide TICKET2 in Arabidopsis thaliana and its orthologs in Arabidopsis lyrata and Capsella rebella that can attract the conspecific pollen tubes,but not the pollen tubes of relative species in *** knockout of the AtTICKET subclade compromised the pollen tube attraction *** study identified a new pollen tube attracting signal and shed light on the molecular basis of reproductive isolation.

关键词： pollen tube attraction peptide attractant reproductive isolation

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In-situ growth of carbon nanotubes on ZnO to enhance thermoelectric and mechanical properties

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Journal of Advanced Ceramics 2022年第12期11卷 1932-1943页

作者： Shengjie FAN Tingting SUN meng jiang Shijia GU Lianjun WANG Haixue YAN Wan jiang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China Engineering Research Center of Advanced Glasses Manufacturing Technology Ministry of EducationDonghua UniversityShanghai 201620China Institute of Functional Materials Donghua UniversityShanghai 201620China School of Engineering and Materials Science Queen Mary University of LondonLondon E14NSUK

As a high-temperature thermoelectric(TE)material,ZnO offers advantages of non-toxicity,chemical stability,and oxidation resistance,and shows considerable promise as a true ready-to-use module under air ***,poor electrical conductivity and high thermal conductivity severely hinder its *** nanotubes(CNTs)are often used as a reinforcing phase in composites,but it is difficult to achieve uniform dispersion of CNTs due to van der Waals ***,we developed an effective in-situ growth strategy of homogeneous CNTs on ZnO nanoparticles by exploiting the chemical vapor deposition(CVD)technology,in order to improve their electrical conductivity and mechanical properties,as well as reducing the thermal ***,magnetic nickel(Ni)nanoparticles are introduced as catalysts for promoting the formation of CNTs,which can also enhance the electrical and thermal transportation of ZnO ***,the electrical conductivity of ZnO is significantly boosted from 26 to 79 S·cm^(−1) due to the formation of dense and uniform conductive CNT *** lattice thermal conductivity(κ_(L))is obviously declined by the intensification of phonon scattering,resulting from the abundant grain boundaries and interfaces in ZnO-CNT ***,the maximum dimensionless figure of merit(zT)of 0.04 at 800 K is obtained in 2.0%Ni-CNTs/ZnO,which is three times larger than that of CNTs/ZnO prepared by traditional ultrasonic *** addition,the mechanical properties of composites including Vickers hardness(HV)and fracture toughness(K_(IC))are also *** work provides a valuable reference for dispersing nano-phases in TE materials to enhance both TE and mechanical properties.

关键词： ZnO carbon nanotubes(CNTs) in-situ grown thermoelectric(TE) mechanical properties

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Collision tumor of primary malignant lymphoma and adenocarcinoma in the colon diagnosed by molecular pathology:A case report and literature review

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World Journal of Clinical Cases 2023年第26期11卷 6289-6297页

作者： meng jiang Xiao-Ping Yuan School of Medicine Sun Yat-sen UniversityShenzhen 518107Guangdong ProvinceChina Department of Radiology Sun Yat-sen Memorial HospitalSun Yat-sen UniversityGuangzhou 510120Guangdong ProvinceChina

BACKGROUND Collision tumors of primary malignant lymphoma and adenocarcinoma in the colon are *** diffuse large B-cell lymphoma(DLBCL)–adenocarcinoma collision tumors are especially *** SUMMARY A 74-year-old woman presented with abdominal pain of 1 mo *** under colonoscopy revealed adenocarcinoma of the ascending ***,the patient underwent laparoscopic radical resection of right colon cancer with lymph node dissection.A collision tumor was found incidentally through postoperative pathological *** analysis showed a collision tumor of DLBCL with germinal center B-cell subtype and TP53 mutation,and adenocarcinoma arising in a tubulovillous adenoma in the colon,with BRAF mutation and mutL homolog 1 promoter *** patient died 3 mo after *** our knowledge,this is the 23rd reported case of collision tumor of colorectal adenocarcinoma and *** mean age of the 23 patients was 73 *** most common site was the *** were 15 cases with followup data including 11 living and four dead with a 3-year overall survival rate of 71.5%.CONCLUSION Based on pathological and genetic analysis,surgery combined with chemotherapy or chemoradiotherapy may have good therapeutic effects for collision tumor.

关键词： Collision tumor Colorectal adenocarcinoma Primary colonic lymphoma Molecular pathological analysis Case report

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High-efficiency and reliable same-parent thermoelectric modules using Mg3Sb2-based compounds

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National Science Review 2023年第6期10卷 75-85页

作者： meng jiang Yuntian Fu Qihao Zhang Zhongliang Hu Aibin Huang Shuling Wang Lianjun Wang Wan jiang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials & College of Materials Science and Engineering Donghua University Institute for Metallic Materials Leibniz Institute for Solid State and Materials Research Dresden (IFW Dresden) State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences Institute of Functional Materials Donghua University

Thermoelectric modules can convert waste heat directly into useful electricity,providing a clean and sustainable way to use fossil energy more ***3Sb2-based alloys have recently attracted considerable interest from the thermoelectric community due to their nontoxic nature,abundance of constituent elements and excellent mechanical and thermoelectric ***,robust modules based on Mg3Sb2have progressed less ***,we develop multiple-pair thermoelectric modules consisting of both n-type and p-type Mg3Sb2-based *** legs based on the same parent fit into each other in terms of thermomechanical properties,facilitating module fabrication and ensuring low thermal *** adopting a suitable diffusion barrier layer and developing a new joining technique,an integrated all-Mg3Sb2-based module demonstrates a high efficiency of 7.5% at a temperature difference of380 K, exceeding the state-of-the-art same-parent thermoelectric ***,the efficiency remains stable during 150 thermal cycling shocks(～225 h),demonstrating excellent module reliability.

关键词： Mg3Sb2 same-parent thermoelectric modules low-temperature joining and high-temperature service power generation efficiency module reliability

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A new two-part test based on density ratio model for zero-inflated continuous distributions

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Applied Mathematics(A Journal of Chinese Universities) 2020年第2期35卷 203-219页

作者： LU Ya-hui LIU Ai-yi jiang meng-jie jiang Tao School of Statistics and Mathematics Zhejiang Gongshang UniversityHangzhou 310018China Biostatistics and Bioinformatics Branch Eunice Kennedy Shriver National Institute of China Health and Human DevelopmentBethesdaMD 20817USA Hangzhou Commercial College Zhejiang Gongshang UniversityHangzhou 311508China

In this paper,we consider testing the hypothesis concerning the means of two independent semicontinuous distributions whose observations are zero-inflated,characterized by a sizable number of zeros and positive observations from a continuous *** continuous parts of the two semicontinuous distributions are assumed to follow a density ratio model.A new two-part test is developed for this kind of *** proposed test takes the sum of one test for equality of proportions of zero values and one conditional test for the continuous *** test is proved to follow a2 distribution with two degrees of *** studies show that the proposed test controls the type I error rates at the desired level,and is competitive to,and most of the time more powerful than two popular tests.A real data example from a dietary intervention study is used to illustrate the usefulness of the proposed test.

关键词： two-part test zero-in ated continuous distributions density ratio model

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Output feedback stabilization of stochastic nonlinear systems with unknown output function 36

Output feedback stabilization of stochastic nonlinear system...

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第36届中国控制会议

作者： meng-meng jiang Xue-Jun Xie Institute of Automation Qufu Normal University

ISBN: (纸本)9781538629185

This paper studies the problem of output feedback stabilization for a class of stochastic nonlinear systems with the unknown output function. For stochastic nonlinear systems, the maximal open sector Δ of output function is given. As long as output function belongs to any closed sector included in Δ, by constructing a reduced-order observer and C Lyapunov function and using the homogeneous domination method, an output feedback controller is constructed to render the closed-loop system globally stable in probability and all states can be regulated to the origin almost surely.

关键词： Stochastic nonlinear systems output feedback stabilization output function

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