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A New and Effective Synthesis of Terminal Alkylselenylacetylenes

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Chinese Chemical Letters 1996年第12期7卷 1085-1086页

作者： De Yu YANG Xian HUANG Ping LI(department of Chemistry, Hangzhou University, Hangzhou 3 10028) department of Chemistry Hangzhou University Hangzhou 310028

The terminal alkylselenylacetylenes (RSe-C = C-H) 3a-h were prepared by the reaction of ethynylmagnesium bromide at -20 degrees C in THF with alkylselenyl bromides derived from dialkyl diselenides and bromide.

关键词： A New and Effective Synthesis of Terminal Alkylselenylacetylenes

Construction of tissue-engineered cartilage using human placenta-derived stem cells

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Science China(Life Sciences) 2010年第2期53卷 207-214页

作者： LIU DaShun1,2,HUI HuangFu3,CHAI XiangBin3,WANG BinQuan3 & QIU JianHua1 1 department of ENT,Xijing Hospital,the Foruth Military Medical University of PLA,Xi’an 710032,China 2 department of ENT,264 Hospital of PLA,Taiyuan 030001,China 3 department of ENT,the First Hospital of Shanxi Medical University,Taiyuan 030001,China department of ENT Xijing Hospital the Foruth Military Medical University of PLA department of ENT 264 Hospital of PLA department of ENT the First Hospital of Shanxi Medical University

Human placenta-derived stem cells (hPDSCs) were isolated by trypsinization and further induced into cartilage cells in *** engineered cartilage was constructed by combining hPDSCs with collagen sponge and the cartilage formation was observed by implantation into nude *** showed that hPDSCs featured mesenchymal stem cells and maintained proliferation in vitro for over 30 passages while remaining *** results indicated that hPDSCs have the potential to differentiate into functional cartilage cells in vitro when combined with collagen sponge,which provided experimental evidence for prospective clinical application.

关键词： human placenta-derived stem cells collagen sponge cartilage tissue engineering

Global existence and blow-up of solutions to a parabolic system with nonlocal sources and boundaries

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Science China mathematics 2007年第9期50卷 1251-1266页

作者： Ling-hua KONG~(1+) Ming-xin WANG~(2,3) 1 department of Applied mathematics,Dalian University of Technology,Dalian 116024,China 2 department of mathematics,Southeast University,Nanjing 210018,China 3 department of mathematics,Xuzhou Normal University,Xuzhou 221116,China department of Applied mathematics Dalian University of Technology Dalian China department of mathematics Southeast University Nanjing China department of mathematics Xuzhou Normal University Xuzhou China

This paper deals with a semi-linear parabolic system with nonlinear nonlocal sources and nonlocal boundaries. By using super-and sub-solution techniques, we first give the sufficient conditions that the classical solution exists globally and blows up in a finite time respectively, and then give the necessary and sufficient conditions that two components u and ν blow up simultaneously. Finally, the uniform blow-up profiles in the interior are presented.

关键词： parabolic system nonlocal sources nonlocal boundary conditions blow-up set simultaneous blow-up uniform blow-up profile 35K15 35K65

ω-Gorenstein injective modules and dimensions

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Science China mathematics 2011年第3期54卷 421-436页

作者： ZHU HaiYan1,2 & DING NanQing3 1department of mathematics, Zhejiang University, Zhejiang 310027, China 2department of mathematics, Zhejiang University of Technology, Zhejiang 310023, China 3department of mathematics, Nanjing University, Nanjing 210093, China department of mathematics Zhejiang University Zhejiang China department of mathematics Zhejiang University of Technology Zhejiang China department of mathematics Nanjing University Nanjing China

Gorenstein injective modules and dimensions have been studied extensively by many authors. In this paper, we investigate Gorenstein injective modules and dimensions relative to a Wakamatsu tilting module.

关键词： Wakamatsu tilting module ω-Gorenstein injective module ω-Gorenstein injective dimension cotilting module

Global existence of smooth solutions to two-dimensional compressible isentropic Euler equations for Chaplygin gases

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Science China mathematics 2010年第3期53卷 719-738页

作者： KONG DeXing 1 , LIU KeFeng 2 & WANG YuZhu 3, 1 department of mathematics, Zhejiang University, Hangzhou 310027, China 2 department of mathematics, University of California at Los Angeles, CA 90095, USA 3 department of mathematics, Shanghai Jiao Tong University, Shanghai 200248, China department of mathematics Zhejiang University department of mathematics University of California at Los Angeles department of mathematics Shanghai Jiao Tong University

In this paper we investigate the two-dimensional compressible isentropic Euler equations for Chaplygin gases. Under the assumption that the initial data is close to a constant state and the vorticity of the initial velocity vanishes, we prove the global existence of the smooth solution to the Cauchy problem for twodimensional flow of Chaplygin gases.

关键词： Chaplygin gases compressible Euler equations irrotational flow null condition Cauchy problem smooth solution

The maximal super-singular integral operators on product spaces

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Science China mathematics 2011年第12期54卷 2615-2626页

作者： WANG Hui1 & CHEN JieCheng2,3, 1department of mathematics, Xidian University, Xi’an 710071, China 2department of mathematics, Zhejiang Normal University, Jinhua 321004, China 3department of mathematics, Zhejiang University, Hangzhou 310027, China department of mathematics Xidian University department of mathematics Zhejiang Normal University department of mathematics Zhejiang University

We study the maximal super-singular integral operator T＊Ω,α,β（f）（x,y）=sup ∈1〉0,∈2〉0｜∫｜u｜〉ε1,｜v｜〉ε2 b1（｜u｜）b2（｜u｜）Ω（u＇,u＇）/｜u｜^n＋α｜u｜^m＋β-f（x-u,y-u）dudu｜defined on all f ∈ S（R^n ×R^m）, where 0 ≤ α,β〈∞, b1 b2 ∈ L∞（R＋1 ）,Ω satisfies certain cancellation conditions and Ω∈L1（S^n-1×S^m-1）in the case α,β〉0;Ω∈L（log＋L）（S^n-1×S^m-1）in the case αβ=0 and α＋β 〉0. It is proved that, for 1〈p〈∞.T＊Ω,α,βis a bounded operator from the homogeneous Sobolev space Lα,β^p（R^n×R^m）to the Lebesgue space L^p（R^n×R^m）.

关键词： super-singular integral maximal operator product spaces

Analysis on cohesive crack opening displacement considering the strain softening effect

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Science China(Physics,Mechanics & Astronomy) 2006年第1期49卷 88-101页

作者： WANG Limin1, XU Shilang2 & ZHAO Xiqiang3 1. Mechanics department, Shandong University of Technology, Zibo 255049, China 2. Civil Engineering department, Dalian University of Technology, Dalian 116024, China 3. mathematics department, Ocean University of China, Qingdao 266071, China Mechanics department Shandong University of Technology Zibo China Civil Engineering department Dalian University of Technology Dalian China mathematics department Ocean University of China Qingdao China

In order to investigate the crack propagation in quasi-brittle materials like rock, ceramic and concrete, Hillerborg and his co-researchers abstracted the fracture process zone in front of a stress free crack in terms of a “fictitious crack zone”. On the fictitious crack zone, cohesive stresses distribute following a given softening relationship of stress vs. crack opening. Based on the polynomial or power series expression of cohesive crack opening displacement, the relationship of the cohesive stress vs. the crack opening displacement is established using elastic theory and integral equation, and some unknown physics variables are obtained using variation approach. The calculation results gained in this paper are close to the experimentally test ones.

关键词： cohesive crack, softening, dissipation work, variation approach.

A local spin evaluation into the active site models of [2Fe2S] ferrodoxin [Fe_2S_2(SR)_4]^(2-) (R=-H, -CH_3)

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Science China Chemistry 2007年第3期50卷 327-334页

作者： WEI JiChong1,2, WANG Yan3 & JU GuanZhi2,3 1 department of Chemistry, Hainan Normal University, Haikou 571158, China 2 State Key Laboratory of Theoretical and Computational Chemistry, Jilin University, Changchun 130023, China 3 department of Chemistry, Nanjing University, Nanjing 210093, China department of Chemistry Hainan Normal UniversityHaikou 571158China State Key Laboratory of Theoretical and Computational Chemistry Jilin UniversityChangchun 130023China department of Chemistry Nanjing UniversityNanjing 210093China

To test the feasibility of local spin theory of Davidson and Clark for ferrodoxin clusters, the models [Fe2S2(SR)4]2- (R=-H, -CH3) are chosen for evaluation. This purpose is realized by calculating the local spin expectation values , , and mA and discussing the connection between these expected values and the Heisenberg spin model (HSM) and the Noodleman broken-symmetry approach. In practical calculation, the spin-unrestricted Hartree-Fock (UHF) and spin-polarized density functional theory (DFT) are used and the calculational qualities of these two methods are also discussed. In addition, the theoretical magnetic coupling constants JAB of these models are calculated by various computational schemes for comparison with both theoretical and experimental results previously reported.

关键词： local spin iron-sulfur protein model density function theory magnetic coupling constant

践行“征信为民”理念助力龙江经济发展——访中国人民银行黑龙江省分行党委委员、副行长赵庆德

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征信 2024年第1期42卷 13-18页

作者：本刊编辑部韩丹焦恒不详

近年来,中国人民银行黑龙江省分行深入践行“征信为民”服务理念,助力龙江经济发展。一是不断优化征信服务工作管理流程,多渠道满足群众征信服务需求;二是持续探索征信助农模式和路径,促进金融更好服务“三农”经济发展;三是推动动产融... 详细信息

近年来,中国人民银行黑龙江省分行深入践行“征信为民”服务理念,助力龙江经济发展。一是不断优化征信服务工作管理流程,多渠道满足群众征信服务需求;二是持续探索征信助农模式和路径,促进金融更好服务“三农”经济发展;三是推动动产融资统一登记公示系统和中征应收账款融资服务平台的应用,助力黑龙江省动产融资业务取得积极进展;四是全力推动黑龙江省征信体系建设,积极推动筹建黑龙江省级地方征信平台;五是不断强化对辖内金融信用信息基础数据库接入机构征信业务行为的监督管理,从严履行监管职责;六是积极推进央行内部(企业)评级工作,拓宽金融机构再贷款渠道;七是持续加大征信宣传力度,不断拓展征信宣传的广度和深度。

关键词：征信需求动产融资征信体系地方征信平台征信监管央行内部(企业)评级征信宣传

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