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Classification of rational holomorphic maps from B^2 into B^N with degree 2

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Science China Mathematics 2009年第12期52卷 2647-2667页

作者： JI ShanYu 1 & ZHANG Yuan 2 1 Department of Mathematics, University of Houston, Houston, TX 77204, USA 2 Department of Mathematics, University of california at San Diego, La Jolla, ca 92093, USA Department of Mathematics University of Houston Houston USA Department of Mathematics Rutgers University New Brunswick USA

Rational proper holomorphic maps from the unit ball in C 2 into the unit ball C N with degree 2 are classified, up to automorphisms of balls.

关键词： rational holomorphic maps between balls classification maps with degree 2

Virtual screening of flavonoids from Jatropha gossypiifolia *** potential drugs for diabetic complications

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Traditional Medicine Research 2022年第2期7卷 34-42页

作者： Yudith cañizares-carmenate Roberto Díaz-Amador Mirtha Mayra Gonzalez-Bedia Tan Tran Quang Nhat Francisco Torrens Juan Alberto castillo-Garit Unit of Computer-Aided Molecular“Biosilico”Discovery and Bioinformatic Research Departamento de FarmaciaFacultad de Química-FarmaciaUniversidad Central“Marta Abreu”de Las VillasSanta Clara 54830Villa ClaraCuba Departamento de Ciencias de la Computación Facultad de MatemáticaFísica y ComputaciónUniversidad CelaraCuntral“Marta Abreu”de Las VillasSanta Clara 54830Villa ClaraCuba Institut Universitari de Ciència Molecular Universitat de ValènciaEdifici d’Instituts de PaternaP.O.Box 22085ValènciaSpain. Unidad de Toxicología Experimental Universidad de Ciencias Médicas de Villa ClaraSanta Clara 50200Villa ClaraCuba.

Background:Diabetes mellitus is a chronic metabolic disease that is a risk factor for epidemic *** hyperglycemic conditions,the enzyme aldose reductase catalyzes the formation of sorbitol in the metabolism of glucose via polyols,leading to the development of diabetic ***,inhibitors of this enzyme are therapeutic targets for the prophylaxis and treatment of these ***:In this study,a generalized linear regression model was developed to analyze flavonoids-obtained from a database-that have been tested as inhibitors of aldose *** this sense,the molecular descriptors implemented in DRAGON and MATLAB software were used to determine the correlation between the chemical structure of the inhibitors and their pharmacological *** model was validated according to the Organisation for Economic Co-operation and Development Standards and subsequently used for the virtual screening of the flavonoids identified in Jatropha gossypiifolia ***:The proposed model showed a good fit for its statistical parameters(R2=0.95).In addition,it showed good predictive power(R2 ext=0.94)and robustness(Q2 LOO=0.92).The experimental chemical space wherein the predictions were reliable(domain of application)was also ***,the model was used to identify 10 flavonoids from Jatropha gossypiifolia *** candidates for natural *** with a low probability of oral absorption were identified,among which the elagic acid biflavonoid showed the greatest promise(pIC50 predicted=9.75).Conclusion:The Jatropha gossypiifolia *** harbors flavonoids with high potential as inhibitors of the aldose reductase enzyme,in which the biflavonoid ellagic acid was shown to be the most promising inhibitor of the aldose reductase enzyme,suggesting its possible use in the treatment of the late complications of diabetes mellitus.

关键词： Jatropha gossypiifolia L. aldose reductase generalized linear regression model diabetic complications

On characterizations of isometries on function spaces

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Science China Mathematics 2008年第4期51卷 620-631页

作者： LI SongYing~(1+) RUAN YingBin~2 1 Department of Mathematics University of california Irvine ca 92697 USA 2 School of Mathematics and Computer Science Fujian Normal University Fuzhou 350007 China Department of Mathematics University of California Irvine USA School of Mathematics and Computer Science Fujian Normal University Fuzhou China

The paper gives characterization for an isometric isomorphism on little Bloch space, VMOA and holomorphic Besov space over the unit ball B n in ? n .

关键词： ismometry Besov spaces 32A17 47A15

Approximation to functions of several variables by superpositions of functions of fewer variables

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Chinese Science Bulletin 1997年第4期42卷 351-352页

作者： CHEN Tianping and CHEN Hong1. Department of Mathematics, Fudan University, Shanghai 200433, China 2. Sun Microsystems, Sunnyvill, ca95050. US Depamnent of Mathematics Fudan University Shanghai China Sun Microsystems Sunnyvill USA

RECENTLY, the approximation to continuous functions by the superposition of a fixed function attracts some mathematicians and engineers, because it is a basic problem in neural networks and wavelets analysis. In a series of papers, we discussed the approximation to continuous functions of several variables by the superposition of a fixed continuous function of one variable. In this letter, we announce several theorems concerned with the approximation to func-

关键词：化石感知脚气主场袭人角山公行五金跳时心场

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正常受试者的小剂量铁耐受试验和机体铁含量

国外医学（医学地理分册） 1992年第3期13卷 119-120页

作者： Libe.,ca 姚海英

FRACTURE TOUGHNESS OF ORDERED INTERMETALLIC COMPOUNDS FROM SMALL DISKSHAPED SPECIMENS

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中国有色金属学会会刊：英文版 1999年第S1期9卷 106-116页

作者： Alan J.Ardell Department of Materials Science and Engineering, University of california, Los Angeles, ca 90095 1595, U.S.A.

The miniaturized disk bend test(MDBT) can be used to measure the fracture toughness at “infinite" crack length, K ∞, of ordered intermetallic compounds. The specimens tested are disks 3 mm in diameter and typically range in thickness from 250 to 400 μm. A Vickers indentation is impressed within ±10 μm of the center of a metallographically polished disk under a known load, F . The specimen is then subjected to biaxial loading, with the indented side in tension, and tested to failure. In completely brittle intermetallics the fracture stress, σ f, is calculated using a standard formula and measured experimentally as a function of F . When plasticity intervenes prior to fracture it is necessary to calculate the stress using finite element modeling (FEM), the FEM program NIKE2D has been used. Whether or not the specimens deform plastically, the resulting data on σ f vs F are analyzed using established equations of fracture mechanics in conjunction with an empirical rising R curve equation that characterizes the increase in fracture resistance, K R( c ), with crack length, c . Results are presented on several ordered intermetallic compounds. These include Ni 3Ge and Ti 5Si 3, which exhibit no ductility prior to fracture, and NiAl and a complex TiAl alloy, which both exhibit limited ductility before fracturing. The values of K ∞ determined with the MDBT are in very good agreement with values of K IC measured using conventional methods.

关键词： ordered intermetallics Ni 3Ge Ti 5Si 3 TiAl fracture toughness miniature disk bend test

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高分辨力超声波诊断在皮肤科的应用

国外医学（皮肤性病学分册） 1994年第1期20卷 22-24页

作者： Gropper ca 顾恒

近20年来,超声诊断已在皮肤科推广应用,它提供了一个无创伤性多部位皮肤检查的手段。该文重点复习有关适用于皮肤科的超声技术,叙述有关超声在皮肤科的特殊应用,并讨论了皮肤科超声应用的前景。

关键词：皮肤病超声波诊断

High sensitivity conductivity-temperature-depth sensing based on an optical microfiber coupler combined fiber loop

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Chinese Optics Letters 2020年第1期18卷 34-39页

作者： Liang ca Yang Yu Min Xiao Junbo Yang Xueliang Zhang Zhou Meng College of Meteorology and Oceanology National University of Defense TechnologyChangsha 410073China Unit 45 No.91388 Troops of PLAZhanjiang 524022China College of Liberal Arts and Sciences National University of Defense TechnologyChangsha 410073China Hunan Aerospace Institute of Electromechanical Devices and Special Material Changsha 410073China

In order to meet the practical needs of all-fiber conductivity-temperature-depth sensors with high sensitivity,compact structure,and easy packaging,this Letter uses a microfiber coupler combined with fiber loop(MCFL)reflective photonic device to conduct salinity,temperature,and deep sensing *** MCFLs’dynamic range and resolution of salinity,temperature,and depth can meet the requirements of actual marine environment *** structure opens up a new design idea for the practical research of microfiber coupler-based marine environmental parameter sensors.

关键词： microfiber coupler(MC) fiber loop salinity temperature and depth sensing cross sensitivity conductivity-temperature-depth measurement system

ASPECTS OF FATIGUE CRACK GROWTH IN INTERMET ALLIcaLLOYS

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中国有色金属学会会刊：英文版 1999年第S1期9卷 214-227页

作者： R.O.Ritchie Department of Materials Science and Mineral Engineering, University of california, Berkeley, ca 94720 1760, U.S.A.

The mechanisms of fatigue crack propagation in intermetallics alloys, specifically γ TiAl, Nb 3Al and MoSi 2, were compared with corresponding behavior in brittle ceramics and ductile metals. This was achieved by considering the process of fatigue crack growth as a mutual competition between intrinsic mechanisms of crack advance ahead of the crack tip (e.g., alternating crack tip blunting and resharpening), which promote crack growth, and extrinsic mechanisms of crack tip shielding behind the tip (crack closure and bridging), which impede it. The differing nature of these mechanisms in brittle and ductile materials and their specific dependence upon the alternating and maximum driving forces (e.g., Δ K and K max ) provided a useful distinction of the process of fatigue crack propagation in these different classes of materials.

关键词： TiAl Nb 3Al MoSi 2 fatigue crack propagation growth