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Hermitian Adjacency Spectrum of Cayley Digraphs over Dihedral Group

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Algebra Colloquium 2020年第1期27卷 121-130页

作者： Honghai li Teng yu College of Mathematics and Information Science Jiangxi Normal University Nanchang 330022China

We first study the spectrum of Hermitian adjacency matrix(H-spectrum)of Cayley digraphs X(D 2n,S)on dihedral group D2n with|S|=*** we show that all Cayley digraphs X(D2P,S)with|S|=3 and p odd prime are Cay-DS,namely,f... 详细信息

关键词： digraph dihedral group Hermitian adjacency matrix Cay-DS 3-DCI property

Biomechanical energy harvesting technologies for wearable electronics:Theories and devices

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Friction 2024年第8期12卷 1655-1679页

作者： xiaowen li Xu ZENG Junwei li Boyuan li yu CHEN xiaosheng ZHANG University of Electronic Science and Technology of China Chengdu 611731China

Wearable biomechanical energy harvesting devices have received a lot of attention recently,benefiting from the rapid advancement of theories and devices in the field of the micro electromechanical system(MEMS).They not only fulfil the requirements for powering wearable electronic devices but also provide an attractive prospect for powering self-powered flexible electronic devices when *** this article,we provide a review of the theories and devices of biomechanical energy harvesting technology for wearable *** different forms of biomechanical energy harvesting mechanisms,including the piezoelectric effect,electromagnetic effect,and electrostatic effect,are investigated in *** fundamental principle of converting other types of energy from the biomechanical environment into electrical energy,as well as the most commonly-used analytical theoretical models,are outlined for each ***,the features,properties,and applications of energy harvesting devices are *** addition,the coupled multi-effect hybrid energy harvesting devices are listed,showing the various possibilities of biomechanical energy harvesting devices for serving as sources,sensors,and ***,we present perspectives on the future trends of biomechanical energy harvesting devices for wearable electronics applications.

关键词： micro electromechanical system(MEMS) nanogenerators biomechanical energy harvesters wearable electronics

A comparison of core–shell Si/C and embedded structure Si/C composites as negative materials for lithium-ion batteries

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Rare Metals 2021年第9期40卷 2440-2446页

作者： Shuai-Jin Wu Zhao-Hui Wu Sheng Fang xiao-Peng Qi Bing yu Juan-yu Yang Grinm Group Co. Ltd.Beijing 100088China General Research Institute for Nonferrous Metals Beijing 100088China China Automotive Battery Research Institute Co. Ltd.Beijing 101407China

Silicon materials have attracted wide attention as negative materials due to exceptional gravimetric capacity and abundance. The strategy of using nano-silicon materials as structural units to construct nano/micro-structured silicon-based negative materials for lithium-ion batteries has come into sight in recent years. In order to provide guidance for the material structure design of micro-sized silicon-based negative materials in practical application, in this work, two commercialized nano/micro-structured silicon-based negative materials with a specific capacity of about 650 mAh·g^(-1) were investigated and compared in the aspects of material microstructure, electrochemical performance of half cells, and electrode morphological evolution during cycling. The cycling performance(with capacity retention ratio of about 17% higher after 100 cycles) and electrode structure maintenance of the embedded structure Si/C material are superior to those of core–shell Si/C material. This research can provide guidance on design and application of nano/micro-structured silicon-based negative materials.

关键词： lithium-ion battery Negative materials Silicon-based materials Material structure

Interleukin-17A facilitates tumor progression via upregulating programmed death ligand-1 expression in hepatocellular carcinoma

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World Journal of Gastrointestinal Oncology 2025年第1期17卷 176-198页

作者： Zhong-Xia Yang li-Ting Zhang xiao-Jun liu Xue-Bin Peng xiao-Rong Mao The First School of Clinical Medicine Lanzhou UniversityLanzhou 730000Gansu ProvinceChina Department of Infectious Diseases The First Hospital of Lanzhou UniversityLanzhou 730000Gansu ProvinceChina Department of Radiotherapy Gansu Provincial HospitalLanzhou 730000Gansu ProvinceChina

BACKGROUND Hepatocellular carcinoma(HCC)is an inflammation-associated tumor with a dismal *** has become an important treatment strategy for HCC,as immunity is closely related to inflammation in the tumor *** regulates the expression of programmed death ligand-1(PD-L1)in the immunosuppressive tumor microenvironment and affects im-munotherapy ***-17A(IL-17A)is involved in the remodeling of the tumor microenvironment and plays a protumor or antitumor role in different *** hypothesized that IL-17A participates in tumor progression by affe-cting the level of immune checkpoint molecules in *** upregulation of PD-L1 expression in HCC cells by IL-17A was assessed by reverse transcription PCR,western blotting,and flow *** studies were conducted with gene knockout models and pathway *** function of IL-17A in immune evasion was explored through coculture of T cells and HCC *** effects of IL-17A on the malignant biological behaviors of HCC cells were evaluated in vitro,and the antitumor effects of an IL-17A inhibitor and its synergistic effects with a PD-L1 inhibitor were studied in *** IL-17A upregulated PD-L1 expression in HCC cells in a dose-dependent manner,whereas IL-17A receptor knockout or treatment with a small mothers against decapentaplegic 2 inhibitor diminished the PD-L1 expression induced by ***-17A enhanced the survival of HCC cells in the coculture ***-17A increased the viability,G2/M ratio,and migration of HCC cells and decreased the apoptotic *** D1,VEGF,MMP9,and Bcl-1 expression increased after IL-17A treatment,whereas BAX expression *** combination of IL-17A and PD-L1 inhibitors showed synergistic antitumor efficacy and increased cluster of differentiation 8+T lymphocyte infiltration in an HCC mouse *** IL-17A upregulates PD-L1 expression via the IL-17A receptor/phosphorylation-small mothers against

关键词： Interleukin-17A Programmed death ligand-1 Interleukin-17A receptor Small mothers against decapentaplegic 2 Hepatocellular carcinoma Immunotherapy

Investigation of shale gas microflow with the Lattice Boltzmann method

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Petroleum Science 2015年第1期12卷 96-103页

作者： xiao-ling Zhang li-Zhi xiao Long Guo Qing-Ming Xie State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Key Laboratory of Shale Gas Exploration Ministry of Land and Resources Chongqing Institute of Geology and Mineral Resources

In contrast to conventional gas-bearing rocks, gas shale has extremely low permeability due to its nano- scale pore networks. Organic matter which is dispersed in the shale matrix makes gas flow characteristics more complex. The traditional Darcy＇s law is unable to estimate matrix permeability due to the particular flow mechanisms of shale gas. Transport mechanisms and influence factors are studied to describe gas transport in extremely tight shale. Then Lattice Boltzmann simulation is used to establish a way to estimate the matrix permeability numerically. The results show that net desorption, diffu- sion, and slip flow are very sensitive to the pore scale. Pore pressure also plays an important role in mass fluxes of gas. Temperature variations only cause small changes in mass fluxes. The Lattice Boltzmann method can be used to study the flow field in the micropore spaces and then provides numerical solutions even in complex pore structure models. Understanding the transport characteristics and establishing a way to estimate potential gas flow is very important to guide shale gas t＇eserve estimation and recovery schemes.

关键词： Shale gas Permeability Adsorption Desorption Diffusion Slip effect

Recovery of scandium from bauxite residue——red mud:a review

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Rare Metals 2016年第12期35卷 887-900页

作者： Na Zhang Hong-Xu li xiao-Ming liu School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing Key Laboratory of Rare and Precious Metals Green Recycling and Extraction University of Science and Technology Beijing

Red mud is a slimy caustic residue generated from alumina production. Taking into account the rela- tively considerable content and availability of scandium, red mud can be viewed as an important and promising scandium resource rather than a solid waste. This paper is primarily to review the investigations of scandium recov- ery from red mud based on the most widely used hydrometallurgical processes including acid leaching, sol- vent extraction and ion exchange adsorption. It is thought that recovery of scandium from red mud should be con- sidered as a direct objective rather than a by-product in the development of overall flowsheet. In order to achieve environmentally-friendly processes with high scandium recovery and low cost, more attention is required to be paid to optimizing the selective leaching of scandium to decrease mineral acid consumption and alleviate pollution, and developing new solvent extraction systems and novel ion exchange adsorption materials with high selectivity and recognition for scandium.

关键词： Red mud Scandium Acid leaching Solvent extraction Ion exchange Selectivity

Active Profiling and Polishing Model and Validation Based on Rotor Spiral Groove

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Chinese Journal of Mechanical Engineering 2018年第2期31卷 198-207页

作者： Guo yu Feng li Yong-Min yu Shou-Xiang Zai School of Earth Sciences and Resources China University of Geosciences Department of Mechanical Engineering College of Information & Business Zhongyuan University of Technology Electrical and Mechanical College Zhongyuan University of Technology Automotive Institute Henan Mechanical Electrical Secondary School

When a spiral groove is formed using superplastic molding, precision casting, additive manufacturing, or other non?mechanical processing technology, it is diffcult to meet the molding precision required for direct use, and the surface quality and accuracy of the shape need to be improved through a finishing process. In view of the poor reachability of the current tool?based polishing process, a tool?less polishing method using free?abrasive grains for complex spiral grooves is proposed. With this method, by controlling the movement of the workpiece, the design basis and relative motion of the abrasive particles along a helical path remain consistent, resulting in a better polishing profile. A spiral groove of a revolving body is taken as the research object; the influence of the installation method and the position of the parts, as well as the effect of the rotational speed of the abrasive ball on its relative motion along a helical trajectory, are studied, and the polishing cutting process of an abrasive ball is reasonably simplified. A consistent math?ematical model of the trajectory of an abrasive ball relative to the design helix is constructed. The grooved drum parts are verified through a polishing experiment. The spiral groove of the revolving body is modified and polished. Experiments show that the process not only corrects the shape a spiral groove error, but also reduces the surface roughness of a spiral groove. This study provides a theoretical basis for achieving free?abrasive, tool?free polishing.

关键词： Revolving body Spiral groove Abrasive ball Active profiling Modified and polished Model verification

High-performance aqueous asymmetric supercapacitors based on the cathode of one-step electrodeposited cracked bark-shaped nickel manganese sulfides on activated carbon cloth

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Science China(Technological Sciences) 2022年第2期65卷 293-301页

作者： ADIL Emin XIE WenLu LONG xiao WANG xiao SONG xiaoQiang CHEN yue FU yuJun li JunShuai li Yali HE DeYan Key Laboratory of Special Function Materials&Structure Design of the Ministry of Education and School of Materials&EnergyLanzhou UniversityLanzhou 730000China

In this work,we report a high-performance self-standing supercapacitor electrode of mixed nickel manganese sulfides (NMSs)with a cracked-bark shape grown by one-step electrochemical deposition on activated carbon cloth (ACC).The electrode possesses outstanding electrochemical properties,including a high specific capacitance of up to 3142.8 F g^(-1)at 1.0 A g^(-1),the high-rate performance (~1206.8 F g^(-1)at 60.0 A g^(-1)),and cycle stability (~92.3%capacitance retention after 8000 cycles at8 A g^(-1)).An asymmetric supercapacitor assembled using NMSs on ACC as the cathode,activated carbon on carbon cloth as the anode and 1.0 mol L;KOH as the electrolyte delivers a high energy density of 111.2 W h kg^(-1)at 800.0 W kg^(-1)and the prominent cycling performance of~93.2%capacitance retention after 10000 cycles at 5 A g^(-1)with the Columbic efficiency of around 100%during these 10000 *** high performance and facile preparation indicate that the NMSs on ACC hold a huge potential as the electrode for supercapacitors.

关键词： aqueous asymmetric supercapacitors nickel manganese sulphides high specific capacitance high energy density long cycle stability

A numerical study for WENO scheme-based on different lattice Boltzmann flux solver for compressible flows

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Acta Mechanica Sinica 2018年第6期34卷 995-1014页

作者： You li xiao-Dong Niu Hai-Zhuan yuan Adnan Khan Xiang li College of Engineering Shantou UniversityShantou 515063China School of Mathematics and Computational Science Xiangtan UniversityXiangtan 411105China

In this paper,the finite difference weighted essentially non-oscillatory (WENO) scheme is incorporated into the recently developed four kinds of lattice Boltzmann flux solver (LBFS) to simulate compressible flows,including inviscid LBFS Ⅰ,viscous LBFS Ⅱ,hybrid LBFS Ⅲ and hybrid LBFS Ⅳ.Hybrid LBFS can automatically realize the switch between inviscid LBFS Ⅰ and viscous LBFS Ⅱ through introducing a switch *** resultant hybrid WENO-LBFS scheme absorbs the advantages of WENO scheme and hybrid *** investigate the performance of WENO scheme based on four kinds of LBFS *** results indicate that the devopled hybrid WENO-LBFS scheme has high accuracy,high resolution and no *** can not only accurately calculate smooth solutions,but also can effectively capture contact discontinuities and strong shock waves.

关键词： WENO scheme Hybrid Lattice Boltzmann flux solver Compressible inviscid flows Contact discontinuities Shock waves