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Mechanical Properties and Microstructure of Al_(2)O_(3)/SiC Composite Ceramics for Solar Heat Absorber

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Journal of Wuhan University of Technology(Materials Science) 2021年第5期36卷 615-623页

作者： WU Jianfeng ZHOU Yang SUN Mengke XU Xiaohong TIAN Kezhong yu jiaqi State Key Laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan 430070China

Al_(2)O_(3)/SiC composite ceramics were prepared fromα-Al_(2)O_(3) and SiC by a pressureless sinter method in this *** effect of SiC contents on the mechanic properties,phase compositions and microstructure is *** results show that the vickers hardness,wear resistance and thermal conductivity of the samples increase with the increase in the SiC content,and the hardness of the sample reaches 16.22 GPa,and thermal conductivity of the sample reaches 25.41 W/(m.K)at room temperature when the SiC content is 20 wt%(B5)and the sintering temperature is at 1640℃.Higher hardness means higher scour resistance,and it indicates that the B5 material is expected to be used for the solar heat absorber of third generation solar thermal *** results indicate the mechanism of improving mechanical properties of Al_(2)O_(3)/SiC composite ceramics:SiC plays a role in grain refinement that the grain of SiC inhibits the grain growth of Al_(2)O_(3),while the addition of SiC changes the fracture mode from the intergranular to the intergranular-transgranular.

关键词： Al_(2)O_(3)/SiC composite ceramics hardness thermal conductivity solar heat absorption material

Linear Electron-Phonon Interaction in Organic Spectral Hole-Burning Materials

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Chinese Physics Letters 1993年第10期10卷 634-637页

作者： TIAN Mingzhen LUO Baozhu LI Wenlian HUANG Shihua yu jiaqi YANG Kaihai Cliangchun Institu te of Physics AcademiaSinicaChangchun 130021 Rese&rch Center Liaoning Normal UniversityDalian 116022

The linear electron-phonon interaction in polymethylmethacrylate(PMMA)doped with electron donor zinc-tetraphenylbenzoporphyrin(ZnTPBP)and acceptor p-hydroxybenzsAdhyde(PHBA)t or p-aininoacetophenone(PAAP)was investigated by photon-gated spectral hole-burning(PHB),The aim is to study the factors that&ffed the linear elec iron-ph on on coupling and the thermal stability of spectral holes in the organic film samples.

关键词： spectral Electron donor

Passivity-based Active Stabilization for DC Microgrid Applications

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CSEE Journal of Power and Energy Systems 2018年第1期4卷 29-38页

作者： jiaqi yu Jingrong yu yue Wang Yijia Cao Xiaonan Lu Dongbo Zhao College of Electrical and Information Engineering Hunan UniversityChangsha 410082China School of Information Science and Engineering Central South UniversityChangsha 410083China Energy Systems Division Argonne National LaboratoryLemontIL 60439USA Eaton Corporation Eden PrairieMNUSA

In this paper,an improved active stabilization strategy of the interface converters in microgrid applications is proposed on the basis of the passivity-based stability criterion(PBSC).As a critical part of AC and DC hybrid microgrids,the DC microgrid is taken as an *** particular,a stabilization method with a proportional-integral(PI)controller and firstorder high-pass filter(HPF)is proposed to meet the passivity requirements of the overall control diagram with respect to the output ***,an output current feedback control loop is introduced to ensure the output impedance ***,a small-signal model of the parallel interface converter system is established to comprehensively study the influence of control parameters on the passivity of the *** on the active stabilization method proposed in this study,by manipulating the control diagram of each interface converter,the passivity and stability of the DC microgrids with variable configuration can be ***,a generic and simplified design approach is realized.A simulation model with three interface converters is implemented in MATLAB/Simulink,and the effectiveness of the proposed passivity-based active stabilization algorithm is verified by using this simulation model.

关键词： Microgrids PBSC small-signal model stabilization

Multi-objective Model Predictive Control of Grid-connected Three-level Inverter Based on Hierarchical Optimization

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Chinese Journal of Electrical Engineering 2021年第1期7卷 63-72页

作者： Ting Liu Yong Li Li Jiang Jianghu Wan jiaqi yu Chao Ding Yijia Cao College of Electrical and Information Engineering Hunan UniversityChangsha 410082China School of Automation Central South UniversityChangsha 410083China College of Electronic Information and Electrical Engineering Changsha UniversityChangsha 410022China

In order to solve the problem of weighting factors selection in the conventional finite-control-set model predictive control for a grid-connected three-level inverter,an improved multi-objective model predictive control without weighting factors based on hierarchical optimization is *** control objectives are considered in this *** grid current and neutral-point voltage of the DC-link are taken as the objectives in the first optimization hierarchy,and by using fuzzy satisfaction decision,several feasible candidates of voltage vectors are ***,the average switching frequency and common-mode voltage are optimized in the second *** average ranking criterion is introduced to sort the objective functions,and the best voltage vector is obtained to realize the coordinated control of multiple *** last,the effectiveness of the proposed strategy is verified by simulation results.

关键词： Multi-objective model predictive control grid-connected three-level inverter hierarchical optimization fuzzy satisfaction decision average ranking criterion

Transcriptome Analysis of Female and Male Henosepilachna vigintioctopunctata(Coleoptera:Coccinellidae)Identifies Sex-related Genes

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Horticultural Plant Journal 2021年第2期7卷 142-148页

作者： Wei Guo Zhuoqi Liu jiaqi yu Jing Lü Xiaoguo Jiao Lan Kong Chunxiao Yang Huipeng Pan Key Laboratory of Bio-Pesticide Innovation and Application of Guangdong Province Engineering Technology Research Center of Agricultural Pest Biocontrol of Guangdong ProvinceSouth China Agricultural UniversityGuangzhou 510642China State Key Laboratory of Biocatalysis and Enzyme Engineering Center for Behavioral Ecology&EvolutionSchool of Life SciencesHubei UniversityWuhan 430062China Department of Computer Science Eastern Kentucky UniversityRichmond KY 40475USA State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources South China Agricultural UniversityGuangzhou 510642China

Henosepilachna vigintioctopunctata is an emerging horticultural pest of Solanaceae plants in ***,we employed transcriptome sequencing of three female and three male *** libraries to identify sex-related *** recorded 281599294 bp of clean reads,and de novo assembly generated 85206 unigenes,with N_(50) of 1311 bp and average length of 763 *** found 5002 genes highly expressed in males and 2179 genes highly expressed in *** profiles of six unigenes specific to females,six unigenes specific to males,and ten unigenes common to both sexes were verified using semi-quantitive RT-PCR;results showed expression levels of these 22 unigenes were relatively consistent with the transcriptome *** all unigenes as references,we identified 6657 putative simple sequence *** transcriptome sequences and gene expression profiles of female and male *** help explore genetic mechanisms of sexual dimorphism.

关键词： Henosepilachna vigintioctopunctata sex RNA-seq transcriptome annotation differential expression

Cordycepin promotes browning of white adipose tissue through an AMP-activated protein kinase(AMPK)-dependent pathway

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Acta Pharmaceutica Sinica B 2019年第1期9卷 135-143页

作者： Guihong Qi yue Zhou Xiaopo Zhang jiaqi yu Xin Li Xiaoxue Cao Chongming Wu Peng Guo Pharmacology and Toxicology Research Center Institute of Medicinal Plant Development Chinese Academy of Medical Sciences &Peking Union Medical College School of Pharmaceutical Science Hainan Medical University

Obesity is a worldwide epidemic. Promoting browning of white adipose tissue(WAT)contributes to increased energy expenditure and hence counteracts obesity. Here we show that cordycepin(Cpn), a natural derivative of adenosine, increases energy expenditure, inhibits weight gain, improves metabolic profile and glucose tolerance, decreases WAT mass and adipocyte size, and enhances cold tolerance in normal and high-fat diet-fed mice. Cpn markedly increases the surface temperature around the inguinal WAT and turns the inguinal fat browner. Further investigations show that Cpn induces the development of brown-like adipocytes in inguinal and, to a less degree, epididymal WAT depots. Cpn also increases the expression of uncoupling protein 1(UCP1) and other thermogenic genes in WAT and3T3-L1 differentiated adipocytes, in which AMP-activated protein kinase(AMPK) plays an important role. Our results provide novel insights into the function of Cpn in regulating energy balance, and suggest a potential utility of Cpn in the treatment of obesity.

关键词： Cordycepin Browning of white adi pose tissue(WAT) Thermogenesis AMP-activated protein kinase(AMPK) Obesity

Effect of annealing on the electrical performance of N-polarity GaN Schottky barrier diodes

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Journal of Semiconductors 2024年第4期45卷 48-55页

作者： Nuo Xu Gaoqiang Deng Haotian Ma Shixu Yang yunfei Niu jiaqi yu yusen Wang Jingkai Zhao yuantao Zhang State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China

A nitrogen-polarity(N-polarity)GaN-based high electron mobility transistor(HEMT)shows great potential for high-fre-quency solid-state power amplifier applications because its two-dimensional electron gas(2DEG)density and mobility are mini-mally affected by device ***,the Schottky barrier height(SBH)of N-polarity GaN is *** leads to a large gate leakage in N-polarity GaN-based *** this work,we investigate the effect of annealing on the electrical characteristics of N-polarity GaN-based Schottky barrier diodes(SBDs)with Ni/Au *** results show that the annealing time and tem-perature have a large influence on the electrical properties of N-polarity GaN *** to the N-polarity SBD without annealing,the SBH and rectification ratio at±5 V of the SBD are increased from 0.51 eV and 30 to 0.77 eV and 7700,respec-tively,and the ideal factor of the SBD is decreased from 1.66 to 1.54 after an optimized annealing *** analysis results suggest that the improvement of the electrical properties of SBDs after annealing is mainly due to the reduction of the inter-face state density between Schottky contact metals and N-polarity GaN and the increase of barrier height for the electron emis-sion from the trap state at low reverse bias.

关键词： nitrogen polarity GaN Schottky barrier diodes annealing interface state

Cooperative interactions among CTA^＋, Br^-and Ag^＋ during seeded growth of gold nanorods

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Nano Research 2017年第6期10卷 2146-2155页

作者： Yong Xu Lei Chen Xingchen Ye Xuchun Wang jiaqi yu Yang Zhao Muhan Cao Zhouhui Xia Baoquan Sun Qiao Zhang Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Institute of Functional Nano and Soft Materials (FUNSOM) Soochow University Suzhou 215123 China Department of Chemistry University of California Berkeley Berkeley CA 94720 USA

We have carried out a comprehensive study on the formation mechanism of Au nanorods （AuNRs） in binary surfactant mixtures composed of quaternary ammonium halide and sodium oleate （NaOL）. We identify the cetyltrimethyl ammonium （CTA）-Br-Ag^＋ complex as the key ingredient in directing the anisotropic growth of AuNRs. Based on the improved understanding of the cooperative interactions among CTA^＋, Br^- and Ag^＋, we further demonstrate that AgBr, which is readily solubilized by the cetyltrimethyl ammonium bromide （CTAB） or cetyltrimethyl ammonium chloride （CTAC） micelles, can be employed as the combined source of Ag^＋ and Br^- for the preparation of AuNRs. The growth of high-quality AuNRs can be completed within 15 min under extremely low bromide content （0.1 mM）.

关键词： gold nanorods anisotropic nanostructure surface plasmon resonance seeded growth cetyltrimethyl ammoniumbromide (CTAB)

A novel copper metabolism-related signature model for predicting the prognosis,target drugs,and immunotherapy in stomach adenocarcinoma

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Genes & Diseases 2024年第5期11卷 21-24页

作者： Kai Zhuang Siqi Tang Haixin Feng Jinying Zhang Ying Liu Yong Liu Yongjian Su jiaqi yu Zunnan Huang Key Laboratory of Computer-Aided Drug Design of Dongguan City The First Dongguan Affiliated HospitalGuangdong Medical UniversityDongguanGuangdong 523710China Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University Key Laboratory for Research and Development of Natural Drugs of Guangdong ProvinceSchool of PharmacyGuangdong Medical UniversityDongguanGuangdong 523808China School of Public Health Guangdong Medical UniversityDongguanGuangdong 523808China Marine Biomedical Research Institute of Guangdong Zhanjiang ZhanjiangGuangdong 524203China

Stomach adenocarcinoma(STAD)is one of the most common gastric neoplasms with a high death ***,there is an urgent need to propose an efficient therapy for *** plays key roles in regulating the distribution of immune cells and affecting the tumor immune escape,and may be a novel indicator of immunotherapy in ***,the specific impact of copper metabolism-related genes(CMRGs)on the patient’s prognosis,tumor microenvironment,and immunotherapeutic response remains unelucidated.

关键词： metabolism stomach adenocarcinoma