检索结果-南通市图书馆

Parabolic equation of the m-Laplacian with nonlinear boundary condition

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第11期43卷 905-908页

作者： WANG Shu+ 1, 2. WANG Mingxin 3, XIE Chunhong 1 1. department of mathematics, Nanjing {2., Nanjing 2.0093, china 2. department of mathematics, henan university, kaifeng 475001, china 3. department of Applied mathematics, Southeast {2., department of Mathernntics Nanjing University Nanjing China department of mathematics Henan University Kaifeng China department of Applied mathematics Southeast University Nanjing China

The existence and nonexistence of global positive weak solutions of parabolic equation of the m-Laplician with nonlinear boundary condition are dealt with. The necessary and sufficient conditions on the existence of a... 详细信息

关键词： nonlinear boundary condition parabolic equation of m-Laplacian global solution blow-up.

On the Exceptional Set for the Equation n=p+k^2

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 1995年第2期11卷 156-167页

作者： Wang Tianze department of mathematics{2. kaifeng, 475001 china lay.psych.mun.ca

Denote by E（X） the number of integers n≤X which are not a sum of a prime and a square. Set θ=1-0.99442.b, where b≤min（0.9365/c3, 0.02.78/c4）, c3, c4 being given in Lemma 8. The result E（x） xθ is proved in th... 详细信息

关键词： Lemma Square Denote Prime sums Integer Equation

Surface-induced interaction of colloidal particles in isotropic liquid crystals

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第7期76卷 114-122页

作者： Hualing Zhang kaifeng Weng Rui Ma department of Physics College of Physical Science and TechnologyXiamen UniversityXiamen 361005China Fujian Provincial Key Laboratory for Soft Functional Materials Research Research Institute for Biomimetics and Soft MatterXiamen UniversityXiamen 361005China

In this work,we study the interaction between two colloidal particles in a liquid crystal that is in the isotropic *** interaction is caused by surface-induced polarization of the liquid crystal molecules in the vicinity of the *** find that the interaction is short-ranged in both 2. and 3D *** symmetric homeotropic anchoring conditions,the interaction is *** under anti-symmetric homeotropic anchoring conditions,the interaction is repulsive at short distances but attractive at intermediate *** particle size has a strong impact on the effective interaction force.

关键词： surface-induced interaction colloidal particles liquid crystals

Pointwise estimates for the maximal multilinear singular integral operators

在线全文

学校读者我要写书评

暂无评论

Science china mathematics 2005年第12期48卷 1696-1706页

作者： HU Guo’en, LI Dengfeng & LU Shanzhen department of Applied mathematics, {2. of Information Engineering, P. O. Box 1001 -747, Zhengzhou 450002. china College of Mathematical and Information Sciences, henan university, kaifeng 475001, china department of mathematics, Beijing Normal {2., Beijing 100875, china 1. department of Applied mathematics University of Information Engineering P.O.Box 1001-747 450002 Zhengzhou China 2. College of Mathematical and Information Sciences Henan University 475001 Kaifeng China 3. department of mathematics Beijing Normal University 100875 Beijing China

Two pointwise estimates relating the maximal multilinear singular integral operators and some classical maximal operators are established. These pointwise estimates imply the rearrangement estimate and the BLO(Rn) est... 详细信息

关键词： multilinear singular integral,maximal operator,BMO (Rn),BLO (Rn).

Doxepin protects cultured neurons against oxidative stress-induced injury

在线全文

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 2004年第3期25卷 43-46页

作者： Bian-sheng JI,He JI1,Guo-qing LIU2.department of Pharmacology,china Pharmaceutical {2.,Nanjing 2.0009 1department of Medicine,henan {2.,kaifeng 475001,china department of Pharmacology China Pharmaceutical University department of Medicine Henan University

AIM: To investigate protective effects of doxepin (Dox) on cultured neuronal injury induced by oxidative stress. METHODS: Cytotoxicities of glutamate (Glu 0.5 mmol/L, 15 min), sodium dithionite (0.5 mmol/L, 2. h) or hemo- globin (Hb100 mg/L,2. h)and the protective effects of Dox were observed. RESULTS: Exposure of cultured neurons to Glu, sodium dithionite and Hb developed a neurotoxicity expressed in the thiazol blue tetrazolium bro- mide (MTT) assay, the increase of lactate dehydrogenase (LDH) leakage, malondialdehyde (MDA) content and intracellular [Ca2.]i accumulation, as well as the decrease of superoxide dismutase (SOD) activity. DOX 1-100 nmol/L significantly inhibited all above changes. CONCLUSION: Dox protects cultured neurons against oxidative stress-induced injury by suppressing intracellular [Ca2.]iaccumulation, decreasing lipid peroxide generation and stimulating antioxidant enzyme.

关键词： doxepin ischemia glutamic acid hemoglobins neurons

HONG　KONG　DIRECT　INVESTMENT　IN　china＇S　MAINLAND：　A　SPATIAL　STUDY　WITH　SPECIAL　REFERENCE　TO　THE　LOCATIONAL　BEHAVIOUR　OF　INVESTORS

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Geographical Science 1996年第4期6卷 289-303页

作者： Li Xiaojian(department of Geography, henan university,{2., PRC) department of Geography Henan University Kaifeng PRC

The study shows that the regional differentiation of Hong Kong direct investement(HKDI) in china was enlarged in the 1980s and has has reducing since 1991. The concentration of HKDI in the southern china and the coast has has replace by the trend of moving northwards and iulandwards after 1989. But in terms of tnanofacturing sectors this trend has not clearly appeared until now. Those changing Patterns are dearly related to the behaviour of Hong Kong industrial *** survey results suggest that 'enjoying lower production cost' is the most important motive for thed investment in china. In consequece, 'close to Hong Kong','cheqper labour' and 'favourable policy' are major factors for determining the investment locations. This behaviour, together with the lack of comparison study in location selection among most investors, explains that Guangdong absorbed most Hong Kong investment in the 1980s. As the production costs have been increasing in Guangdong, are companies have started to invest in non-Guangdong locations since the end of the 1980s. From the mental map of Hong Kong investors, however, only some of the non-Guangdong locations are practically attractive.

关键词： investment location spatial behaviour of firms china Hong Kong

Population-size-dependent branching processes in Markovian random environments

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第8期43卷 635-638页

作者： WANG Hanxing 1 and DAI Yonglong 2.1. department of mathematics, Shanghai {2., Shanghai 2.1800, china 2. department of mathematics, Zhongshan {2., Guangzhou 5102.5, china department of mathematics Shanghai University Shanghai China department of mathematics Zhongshan University Gunngzhou China

A branching model {Z n} n≥0is considered where the offspring distribution of the population’s evolution is not only dependent on the population size, but also controlled by a Markovian environmental process {ξ n} n≥0. For this model, asymptotic behaviour is studied such as limn→∞Z n and limn→∞Z n/m n in the case that the mean m k, θof the offspring distribution converges to m>1 as the population size k grows to ∞. In the case that {ξ n} n≥0is an irreducible positive recurrent Markov chain, certain extinction (i.e. P(Z n=0 for some n)=1) and noncertain extinction (i.e. P(Z n=0 for some n)<1) are studied.

关键词： Markov chains in random environments stochastic population models branching processes.

Perturbations of the radical of nest algebras

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第7期43卷 556-560页

作者： LU Fangyan 1 and LU Shijie 2.1. department of mathematics, Suzhou {2., Suzhou 2.5006, china 2. department of mathematics, Zhejiang {2., Hangzhou 31002., china department of mathematics Suzhou University Suzhou China department of mathematics Zhejiang University Hangzhou China

Let R N and K-N be the radical ideal and the compact operator ideal of nest algebra T(N) respectively. It is proved thatR-N+K-N=span{T∈T(N)∶TT(N)NCT}=span{T∈T(N): #σ′(ST)≤1, S∈T(N)}.

关键词： nest algebras radical perturbation.

The Ternary Goldbach Problem with Primes in Arithmetic Progressions

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2001年第4期17卷 679-696页

作者： Zhen Feng ZHANG Tian Ze WANG State Key Laboratory of Information Security, Graduate School, Chinese Academy of Sciences, Beijing 100039, P. R. china Depariment of mathematics,{2., kaifeng 475001, P. R. china department of mathematics,{2., kaifeng 475001, P. R. china State Key Laboratory of Information Security Graduate School Chinese Acacemy of Sciences Beijing 100039 P. R. China department of mathematics Henan University Kaifeng 475001 P. R. China

In this paper, we give an explicit numerical upper bound for the moduli of arithmetic progressions, in which the ternary Goldbach problem is solvable. Our result implies a quantitative upper bound for the Linnik const... 详细信息

关键词： Ternary Goldbach problem Prime Arithmetic progression Circle method