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Abundance Analysis of HD131023

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Chinese Physics Letters 2001年第3期18卷 461-462页

作者： ZHANG hua-wei ZHAO Gang Beijing Astronomical Observatory Chinese Academy of SciencesBeijing 100012 Chinese Academy of Sciences-Peking University Joint Beijing Astrophysical Center Beijing 100871 Department of Astronomy Peking UniversityBeijing 100871

Based on high resolution and high signal-to-noise ratio spectra,we determine the chemical abundances of nearby star HD131023 by using the differential *** of total 24 elements are *** heavy elements,such as Sr,Y,Ba,La... 详细信息

关键词： analysis. Abu abundant

A numerical approach to the interaction between airflow and a high-speed train subjected to crosswind

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2013年第7期14卷 482-493页

作者： Tian LI Ji-ye ZHANG wei-hua ZHANG State Key Laboratory of Traction Power Southwest Jiaotong University

Aerodynamic forces and dynamic performances of railway vehicles are coupled and affected by each other. On the one hand, aerodynamic forces change the displacements of a train. On the other hand, displacements affect aerodynamic forces. Based on vehicle-track coupling dynamics and aerodynamics, a numerical approach to the interaction between airflow and a high-speed train is presented in this paper. Aerodynamic forces and dynamic performances of a high-speed train subjected to crosswind were numerically simulated. Results showed that the interaction between airflow and a high-speed train has a significant influence on displacements and aerodynamic forces of the head coach. Therefore, it is necessary to consider the interaction between airflow and a high-speed train subjected to crosswind.

关键词： High-speed train Crosswind Aerodynamics Co-simulation Interaction

Formation of macroporous gel morphology by phase separation in the silica sol-gel system containing nonionic surfactant

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Journal of University of Science and Technology Beijing 2005年第6期12卷 564-571页

作者： Junsheng Wu Xiaogang Li wei Du hua Chen Materials Science and Engineering School University of Science and Technology Beijing Beijing 100083 China

The phase separation and gel formation behavior in an alkoxy-derived silica sol-gel system containing C16EO15 has been investigated. Various gel morphologies similar to other sol-gel systems containing organic additives were obtained by changing the preparation conditions. Micrometer-range interconnected porous gels were obtained by freezing transitional structures of phase separation in the sol-gel process. The dependence of the resulting gel morphology on several important reaction parameters such as the starting composition, reaction temperature and acid catalyst concentration was studied in detail. The experimental results indicate that the gel morphology is mainly determined by the time relation between the onset of phase separation and gel formation.

关键词： silica sol-gel phase separation macroporous gel morphology nonionic surfactant

Intelligent Fault Diagnosis in Lead-zinc Smelting Process

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International Journal of Automation and computing 2007年第2期4卷 135-140页

作者： wei-hua Gui Chun-hua Yang Jing Teng School of Information Science ＆ Engineering Central South University Changsha 410083 PRC

According to the fault characteristic of the imperial smelting process （ISP）, a novel intelligent integrated fault diagnostic system is developed. In the system fuzzy neural networks are utilized to extract fault symptom and expert system is employed for effective fault diagnosis of the process. Furthermore, fuzzy abductive inference is introduced to diagnose multiple faults. Feasibility of the proposed system is demonstrated through a pilot plant case study.

关键词： Fault diagnosis fuzzy logic expert system neural network inference.

Coulomb blockade and hopping transport behaviors of donor-induced quantum dots in junctionless transistors

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Chinese Physics B 2020年第3期29卷 436-441页

作者： Liu-Hong Ma wei-hua Han Fu-hua Yang School of Physics and Microelectronics Zhengzhou UniversityZhengzhou 450001China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Engineering Research Center for Semiconductor Integrated Technology Beijing Engineering Center of Semiconductor Micro-Nano Integrated TechnologyInstitute of SemiconductorsChinese Academy of SciencesBeijing 100083China State Key Laboratory for Superlattices and Microstructures Institute of SemiconductorsChinese Academy of SciencesBeijing 100083China

The ionized dopants, working as quantum dots in silicon nanowires, exhibit potential advantages for the development of atomic-scale transistors. We investigate single electron tunneling through a phosphorus dopant induced quantum dots array in heavily n-doped junctionless nanowire transistors. Several subpeaks splittings in current oscillations are clearly observed due to the coupling of the quantum dots at the temperature of 6 K. The transport behaviors change from resonance tunneling to hoping conduction with increased temperature. The charging energy of the phosphorus donors is approximately 12.8 meV. This work helps clear the basic mechanism of electron transport through donor-induced quantum dots and electron transport properties in the heavily doped nanowire through dopant engineering.

关键词： junctionless nanowire transistor quantum transport hopping transport quantum dot

Epstein-Barr virus infection mimicking acute appendicitis: a case report

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World Journal of Emergency Medicine 2023年第2期14卷 148-151页

作者： Li Wang wei-hua Gong Department of Emergency Medicine the Second Affiliated Hospital of Zhejiang University School of MedicineHangzhou 310009China Department of Surgery the Second Affiliated Hospital of Zhejiang University School of MedicineHangzhou 310052China

Dear editor,Epstein-Barr virus (EBV) infection is common, and more than 90%of adults develop serum EBV antibodies over the course of life.[1]After the first EBV infection, a longterm latent infection develops, which i... 详细信息

关键词： infection acute editor

Predictive model using four ferroptosis-related genes accurately predicts gastric cancer prognosis

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World Journal of Gastrointestinal Oncology 2024年第5期16卷 2018-2037页

作者： Li Wang wei-hua Gong Department of Emergency The Second Affiliated Hospital of Zhejiang University School of MedicineHangzhou 310000Zhejiang ProvinceChina Department of Surgery The Second Affiliated Hospital Zhejiang University School of MedicineHangzhou 310052Zhejiang ProvinceChina

BACKGROUND Gastric cancer(GC)is a common malignancy of the digestive *** to global 2018 cancer data,GC has the fifth-highest incidence and the thirdhighest fatality rate among malignant *** than 60%of GC are linked to infection with Helicobacter pylori(***),a gram-negative,active,microaerophilic,and helical *** parasite induces GC by producing toxic factors,such as cytotoxin-related gene A,vacuolar cytotoxin A,and outer membrane ***,or iron-dependent programmed cell death,has been linked to GC,although there has been little research on the link between *** infection-related GC and *** To identify coregulated differentially expressed genes among ferroptosis-related genes(FRGs)in GC patients and develop a ferroptosis-related prognostic model with discrimination *** Gene expression profiles of GC patients and those with ***-associated GC were obtained from The Cancer Genome Atlas and Gene Expression Omnibus(GEO)*** FRGs were acquired from the FerrDb database.A ferroptosis-related gene prognostic index(FRGPI)was created using least absolute shrinkage and selection operator–Cox *** predictive ability of the FRGPI was validated in the GEO ***,we verified the expression of the hub genes and the activity of the ferroptosis inducer FIN56 in GC cell lines and *** Four hub genes were identified(NOX4,MTCH1,GABARAPL2,and SLC2A3)and shown to accurately predict GC and ***-associated *** FRGPI based on the hub genes could independently predict GC patient survival;GC patients in the high-risk group had considerably worse overall survival than did those in the low-risk *** FRGPI was a significant predictor of GC prognosis and was strongly correlated with disease ***,the gene expression levels of common immune checkpoint proteins dramatically increased in the highrisk subgroup of the FRGPI *** hub genes were also conf

关键词： Ferroptosis Gastric cancer Helicobacter pylori infection Immune checkpoint protein Prognostic model Ferroptosis-related gene prognostic index

Up/down-conversion luminescence of monoclinic Gd_(2)O_(3):Er^(3+)nanoparticles prepared by laser ablation in liquid

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Chinese Physics B 2022年第7期31卷 49-55页

作者： hua-wei Deng Di-Hu Chen State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-Sen UniversityGuangzhou 510275China

Multifunctional luminescent materials are attracting attention *** this work,monoclinic Gd_(2)O_(3):Er^(3+)nanoparticles,which possess up-conversion luminescence and down-conversion luminescence properties,were successfully synthesized by laser ablation in liquid(LAL)***-conversion luminescence and down-conversion luminescence of monoclinic Gd_(2)O_(3):Er^(3+)nanoparticles were got under the excitation of 980 nm and 379 nm,*** addition,tunable luminescence was ***,the cytotoxicity of the nanoparticles is low and the fluorescence of the nanoparticles in cell is also strong *** results indicate that the Gd_(2)O_(3):Er^(3+)nanoparticles synthesized by LAL technique are promising candidates for bio-imaging or other fields that require controllable fluorescence.

关键词： Gd_(2)O_(3) nanoparticles luminescence laser ablation in liquid

Riddled Basin of Laser Cooled-Ions in a Paul Trap

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Chinese Physics Letters 1996年第2期13卷 81-84页

作者： SHEN Jing-ling YIN hua-wei DAI Jian-hua ZHANG Hong-jun Optical Physics Laboratory Institute of PhysicsAcademia SinicaBeijing 100080

Recently it has been found that the entire basin of a given attractor is riddled with"lioles^leading to another *** we present the first physical system-the laser cooled ions in a Paul trap that exhibits riddled basin... 详细信息

关键词： attractor. Paul laser