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Phase-modulated mechanical and thermoelectric properties of Ag_(2)S_(1-x)Te_(x)ductile semiconductors

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Journal of Materiomics 2022年第3期8卷 656-661页

作者： Liming Peng Shiqi Yang Tian-Ran Wei Pengfei qiu Jiong Yang zhen Zhang Xun Shi Lidong chen State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai200050China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing100049China State Key Laboratory of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai200240China School of Chemistry and Materials Science Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou310024China Materials Genome Institute Shanghai UniversityShanghai200444China Division of Solid-State Electronics Department of Electrical EngineeringUppsala University75237UppsalaSweden

By virtue of the excellent plasticity and tunable transport properties,Ag_(2)S-based materials demonstrate an intriguing prospect for flexible or hetero-shaped thermoelectric *** them,Ag_(2)S_(1-x)Te_(x)exhibits rich and interesting variations in crystal structure,mechanical and thermoelectric transport ***,Te alloying obviously introduces extremely large order-disorder distributions of cations and anions,leading to quite complicated crystal structures and thermoelectric *** composition-structure-performance correlation of Ag_(2)S_(1-x)Te_(x)still remains to be *** this work,we designed and prepared a series of Ag_(2)S_(1-x)Te_(x)(x=0-0.3)materials with low Te *** discovered that the monoclinic-to-cubic phase transition occurs around x=0.16 at room *** alloying plays a similar role as heating in facilitating this monoclinic-to-cubic phase transition,which is analyzed based on the thermodynamic *** with the monoclinic counterparts,the cubic-structured phases are more ductile and softer in mechanical *** addition,the cubic phases show a degenerately semiconducting behavior with higher thermoelectric performance.A maximum zT=0.8 at 600 K and bending strain larger than 20% at room temperature were obtained in Ag_(2)S_(0.7)Te_(0.3).This work provides a useful guidance for designing Ag_(2)S-based alloys with enhanced plasticity and high thermoelectric performance.

关键词： Thermoelectric materials Ag_(2)S-Ag_(2)Te ductile semiconductors Phase transition Mechanical properties Transport properties

Adjuvant Chemotherapy May Not Be Necessary for Women with Stage IC1 Epithelial Ovarian Cancer

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Current Medical Science 2022年第1期42卷 192-200页

作者： Dong-mei DENG qiu-yue LIAO Jie YANG Jing chen Ge chen Hua-lin BAI Bo ZHANG Ke-zhen LI Department of Gynecology and Obstetrics Tongji HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430030China

Objective:To determine whether adjuvant chemotherapy improves the prognoses in women with stage IC1 epithelial ovarian cancer(EOC).Methods:All eligible women diagnosed with stage IC1 EOC from 2003 to 2019 in Tongji Hospital were *** characteristics,tumor features,surgical types,and chemotherapeutic treatments were ***-Meier analysis and Cox regression analysis were performed to evaluate progression-free survival(PFS)and overall survival(OS).

关键词： adjuvant chemotherapy epithelial ovarian cancer intraoperative rupture overall survival progression-free survival

Permian–Triassic Climatic and Environmental Extremes and Biotic Response (IGCP 630:2014–2018):Goals and Achievements

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Acta Geologica Sinica(English Edition) 2019年第3期93卷 780-782页

作者： chen Zhongqiang GUO zhen State Key Laboratory of Biogeology & Environmental Geology China University of Geosciences

IGCP 630,with its full title of"Permian-Triassic(P-Tr)climatic and environmental extremes and biotic response",is an International Geoscience Program project sponsored by the United Nation Educational,Scientific&Cultural Organization(UNESCO)and International Union of Geological Sciences(IUGS).This project was approved in 2014 and ended in 2018,and has applied for one-year extension in *** 630 consists of 150 geoscientists across multidisciplinary geosciences from 27 countries around the world.

关键词： Permian-Triassic Climatic Environmental Extremes Biotic Response

Review:Research progress on Fabry-Perot resonator antenna

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第4期10卷 583-588页

作者： zhen-guo LIU Zhi-chen GE Xi-yuan chen State Key Lab of Millimeter Waves Southeast University Nanjing 210096 China zhenjiang Entry-Exit Inspection and Quarantine Bureau Zhenjiang 212003 China Department of lnstrument Science and Engineering Southeast University Nanjing 210096 China

The Fabry-Perot resonator (FPR) antenna has found wide applications in microwave and millimeter waves and recently attracted considerable interest. In this paper, a summary of planar and cylindrical structures, analytic models and research development is presented, and a comparison between these structures and analytic models is made, showing that such analytic models as the FP cavity mode, electromagnetic band gap (EBG) defect mode, transmission line mode, and leaky-wave mode are consistent when applied to analyze this type of resonator antenna. Some interesting topics under recent research, including dual or multi-band, improvement of gain bandwidth, low profile and beam control, are surveyed.

关键词： Fabry-Perot resonator (FPR) antenna Electromagnetic band gap (EBG) resonator antenna Leaky-wave antenna Defect mode Artificial magnetic conductor (AMC) Frequency selective surface (FSS)

Free-Space Optical communication using visible light

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第2期8卷 186-191页

作者： HU Guo-yong chen Chang-ying chen zhen-qiang Institute of Optoelectronic Engineering Jinan University Guangzhou 510632 China Department of Optoelectronic Engineering Jinan University Guangzhou 510632 China

The possibility of visible red light laser being used as signal light source for Free-Space Optical (FSO) communication is proposed. Based on analysis of transmission in atmospheric channel concerning 650 nm laser beam, performance of wireless laser communication link utilizing a low power red laser diode was evaluated. The proposed system can achieve a maximum range of 300 m at data rate 100 Mb/s theoretically. An experimental short-range link at data rate 10 Mb/s covering 300 m has been implemented in our university. It is feasible to enhance the system performance such as link range and data rate by increasing transmitting power and decreasing laser beam divergence angle or through other approaches.

关键词： Visible light communication Red light laser Free-Space Optical communication Wireless laser communication

Muscle Fiber Type Changes in Lumbrical Muscles at Early Stages of Chronic Nerve Compression

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Current Medical Science 2019年第1期39卷 59-66页

作者： zhen-yu LIU Jiang-hai chen zhen-bing chen Department of Hand Surgery Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022China

Chronic nerve compression(CNC)neuropathy is a common disease in the clinic and provokes paraesthesia,or numbness at early *** changes in muscle fiber composition and motor nerve terminal morphology in distal muscles were studied in this study.A well-established CNC model was used to assess the changes in the *** were measured by von Frey filament test The myosin heavy chain isoforms and neuromuscular junctions(NMJs)were stained by immunofluorescence to show the muscle fiber types composition and motor nerve terminals morphologic changes in the flexor digitorum longus(FDL)and lumbrical *** fiber cross-sectional areas of different muscle fiber types were *** small-fiber degeneration of cutaneous nerve fibers was examined by detecting the protein gene product 9.5(PGP9.5)with *** 2nd month after compression,the proportion of type I and type IIB fibers was markedly decreased,and that of type n A fibers was increased in the lumbrical *** was no significant change in composition of muscle fiber types in FDL and NMJ morphology of FDL and lumbrical ***-epidermal nerve fibre density(IENFD)declined at 2nd month after the *** study reveals the morphological changes of the FDL and lumbrical muscle at an early stage of *** findings may be helpful to understand muscle damage and pathophysiological development of the nerve compression,and provide new evidence for early treatment of CNC.

关键词： chronic nerve compression neuropathy carpal tunnel syndrome lumbrical muscles intra-epidermal nerve fiber density neuromuscular junctions

Regulation of intestinal stem cell fate specification

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Science China(Life Sciences) 2015年第6期58卷 570-578页

作者： QI zhen chen Ye-Guang State Key Laboratory of Biomembrane and Membrane Biotechnology Tsinghua-Peking Center for Life Sciences School of Life SciencesTsinghua University

The remarkable ability of rapid self-renewal makes the intestinal epithelium an ideal model for the study of adult stem cells. The intestinal epithelium is organized into villus and crypt, and a group of intestinal stem cells located at the base of crypt are responsible for this constant self-renewal throughout the life. Identification of the intestinal stem cell marker Lgr5, isolation and in vitro culture of Lgr5+ intestinal stem cells and the use of transgenic mouse models have significantly facilitated the studies of intestinal stem cell homeostasis and differentiation, therefore greatly expanding our knowledge of the regulatory mechanisms underlying the intestinal stem cell fate determination. In this review, we summarize the current understanding of how signals of Wnt, BMP, Notch and EGF in the stem cell niche modulate the intestinal stem cell fate.

关键词： intestinal stem cells Wnt BMP Notch EGF fate specification

One-dimensional heat equation with discontinuous conductance

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Science China Mathematics 2015年第1期58卷 97-108页

作者： chen zhen-Qing ZILI Mounir Department of Mathematics University of Washington Department of Mathematics Faculty of Sciences of MonastirAvenue de l'environnement

We study a second-order parabolic equation with divergence form elliptic operator,having a piecewise constant diffusion coefficient with two points of *** partial differential equations appear in the modelization of diffusion phenomena in medium consisting of three kinds of *** probabilistic methods,we present an explicit expression of the fundamental solution under certain *** also derive small-time asymptotic expansion of the PDE’s solutions in the general *** obtained results are directly usable in applications.

关键词： stochastic differential equation semimartingale local time strong solution skew Brownian mo-tion heat kernel asymptotic expansion

Hitting Probabilities and the Hausdorff Dimension of the Inverse Images of a Class of Anisotropic Random Fields

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Acta Mathematica Sinica,English Series 2015年第12期31卷 1895-1922页

作者： zhen Long chen Quan ZHOU School of Statistics and Mathematics Zhejiang Gongshang University

Let X = {X（t）：t ∈ R^N} be an anisotropic random field with values in R^*** certain conditions on X,we establish upper and lower bounds on the hitting probabilities of X in terms of respectively Hausdorff measure and Bessel-Riesz *** also obtain the Hausdorff dimension of its inverse image,and the Hausdorff and packing dimensions of its level *** results are applicable to non-linear solutions of stochastic heat equations driven by a white in time and spatially homogeneous Gaussian noise and anisotropic Guassian random fields.

关键词： Anisotropic random field non-linear stochastic heat equations spatially homogeneous Gaussian noise hitting probabilities Hausdorff dimension inverse image