检索结果-南通市图书馆

A Formula for the Non-integer Powers of the Laplacian

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 1999年第1期15卷 21-24页

作者： Zhengxu HeDepartment of Mathematics,university of California,San Diego,La Jolla,CA 92093-0112,usa Department of Mathematics University of California San Diego La Jolla USA

We provide an elementary formula for the non-integer powers of the Laplace operator in the Euclidean *** formulas are helpful in establishing the elliptic nature of some pseudo- differential operators arising from the... 详细信息

关键词： Laplacian Power of Laplacian

Thermal Diversities of Two Na^+/H^+ Exchanges in Guinea Pig Red Cells

在线全文

学校读者我要写书评

暂无评论

Biomedical and Environmental Sciences 2001年第3期14卷 171-179页

作者： JI HONG-LONG 1Department of Cellular Biology, university of Georgia, Athens, Georgia 30602, usa Department of Cellular Biology University of Georgia Athens Georgia 30602 USA. ji@physiology.uab.edu

Objective\ To test the effect of hypothermia on Na+/H+ exchange, activated by shrinkage and cytoplasmic acidosis. Method\ Amiloride-sensitive Na+ influx in guinea pig red cells was traced with isotope 22Na and intracellular Na+ concentration was measured by emission flame photometry. Result\ Amiloride-sensitive Na+ influx decreased linearly as a function of temperatures (about 37℃) in shrunken cells, but increased in acidified cells. The up-regulation of acid-induced Na+/H+ exchange by elevated temperature was enhanced by hypo-osmolarity. Less sensitivity of intracellular H+ site at 41℃ may be the mechanism for the inhibition of shrinkage-induced Na+/H+ exchange by elevated temperature. Heating-mediated explosive increase in the activity of acid-induced Na+/H+ exchange may be due to enhanced extracellular Na+ sensitivity and lower intracellular pH caused by acidic metabolites. Acid-induced Na+/H+ ewxchange contributes to cytoplasmic Na+ accumulation. Conclusion\ These two modes of Na+/H+ exchange with different response to elevated temperature may play different roles in the cellular pathogenesis of heatstroke.

关键词： Animals Cell Culture Techniques Erythrocytes Guinea Pigs Heat Stroke Hydrogen Ion Exchange Research Support, U.S. Gov't, Non-P.H.S. Sodium Temperature

On hypothesis testing with a partitioned random alternative

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2010年第4期53卷 927-938页

作者： WANG WeiZhen Department of Mathematics and Statistics,Wright State university,Dayton,OH 45435,usa 1. Department of Mathematics and Statistics Wright State University Dayton OH 45435 USA

It is common in statistical practice that one needs to make a choice among m + 1 mutually exclusive claims on *** m=1,it is done by the (traditional) hypothesis *** this paper,a generalization to the case m > 1 is *** fundamental difference with the case m=1 is that the new alternative hypothesis is a partition of m multiple claims and is *** is used to decide which claim in the partition is to be tested as the ***,a random alternative is *** conditional and overall type I errors of the proposed test are controlled at a given level,and this test can be used as a new solution for the general multiple test *** classical problems,including the one-sample problem,model selection in multiple linear regression,and multi-factor analysis,are revisited,and new tests are provided ***,the famous two-sided t-test should be replaced by the proposed.

关键词： analysis of variance conditional probability multiple linear regression one-sample problem

Arithmetic of Shimura curves

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2010年第3期53卷 573-592页

作者： ZHANG Shou-Wu Department of Mathematics, Columbia university, New York, NY 10027, usa 1. Department of Mathematics Columbia University New York NY 10027 USA

This is the note for a series of lectures that the author gave at the Centre de Recerca Matemtica (CRM), Bellaterra, Barcelona, Spain on October 19–24, 2009. The aim is to give a comprehensive description of some recent work of the author and his students on generalisations of the Gross-Zagier formula, Euler systems on Shimura curves, and rational points on elliptic curves.

关键词： Shimura curves CM-points L-series

A spectral interpretation for the explicit formula in the theory of prime numbers

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2010年第3期53卷 791-812页

作者： LI Xian-Jin Department of Mathematics, Brigham Young university, Provo, Utah 84602, usa 1. Department of Mathematics Brigham Young University Provo Utah 84602 USA

A spectral interpretation for the poles and zeros of the L-function of algebraic number fields is given by Meyer. As Meyer works with Schwartz spaces which are not Hilbert spaces, the information on the location of zeros of the L-function is lost. In 1999, A. Connes gave a spectral interpretation for the critical zeros the Riemann zeta function. He works with Hilbert spaces. In this paper, we show that a variant of Connes’ trace formula is essentially equal to the explicit formula of A. Weil.

关键词： explicit formula fourier analysis Riemann hypothesis trace formula

SEDIMENT MANAGEMENTAT HYDROPOWER RESSERVOIRS

在线全文

学校读者我要写书评

暂无评论

International Journal of Sediment Research 1999年第2期14卷 391-397页

作者： Shou-shan FAN (university of Wisconsin at Milwaukee, WI53211, usa)

In the United States. most of the non-Federal hydropower (N-FHP) reservoirs licensed by the Federal Energy Regulatory Commission (FERC) were constructed only within the past 100 years. At NFUP reservoirs sedimentation issues can be characterized as either generic or special. The generic sedimentation issues are often similar to those of other agencies. The special sedimentation issues are those believed to be distinct from that of other federal agencies, i.e. Corps of Engineers, Bureau of Reclamation. etc. Since the generic issues have been discussed elsewhere (Fan, 1989 & 1990), this paper will only address selected major investigations of special sedimentation issues at some hydro reservoirs. This paper is based on the author’s experience in managing NFHP projects at the FERC. We discuss the major sedimentation issues at some hydropower reservoirs and the manner in which problems were cost effectively mitigated and managed.

关键词： Sediment Contamination Sediment management Hydro development

On interpolation for Hormander’s algebras

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China Mathematics 2010年第3期53卷 763-770页

作者： LI Bao Qin Department of Mathematics, Florida International university, Miami, FL 33199, usa 1. Department of Mathematics Florida International University Miami FL 33199 USA

We discuss some recent results on interpolation problems for weighted Hrmander’s algebras of holomorphic functions in several complex variables, and also give a sharp estimate on counting functions of interpolating... 详细信息

关键词： weight pseudoconvex set Hrmander’s algebra interpolating variety plurisubharmonic function holomorphic function entire function

ECOLOGICAL CONSEQUENCES OFSOIL EROSION AND SEDIMENTATION

在线全文

学校读者我要写书评

暂无评论

International Journal of Sediment Research 1999年第2期14卷 355-361页

作者： Grace S. BRUSH (Johns Hopkins university , Baltimore, Maryland, usa)

Sediment erosion and siltation in waterways can have ecological consequences as disastrous economically as those related to transport and flooding of adjacent lands. The impact of sediment erosion and deposition on human societies is recorded in many historical documents. The paleoecological record also provides evidence of the long-term effects of siltation. Sedimentation rates in the Chesapeake Bay estuary, in mid-Atlantic usa, have doubled and quadrupled over the last 200 to 300 years with the initiation and intensification of agriculture. The result has been filling in of many estuarine tributaries and the transformation of the estuary from a benthic to a planktonic ecosystem. This change took place as light became limiting in the water column and benthic plants could no longer photosynthesize, resulting in a proliferation of planktonic algae. Planktonic algal growth was also fueled by fertilizers attached to eroded soil particles. leading ultimately to eutrophication within the water column and anoxia of the bottom waters.

关键词： Sedimentation Civilizations Land use Sediment cores

OPTIMAL COARSE GRID SIZE IN DOMAIN DECOMPOSITION

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 1994年第4期12卷 291-297页

作者： Tony Chan Jian-Ping Shao(Department of Mathematics, university of Califoruia, Los Angeles, usa) UNIV CALIF LOS ANGELES DEPT MATHLOS ANGELESCA 90024

In most domain decomposition (DD) methods, a coarse grid solve is employed to provide the global coupling required to produce an optimal method. The total cost of a method can depend sensitively on the choice of the coaxse grid size H. In this paper, we give a simple analysis of this phenomenon for a model elliptic problem and a variant of Smith's vertex space domain decomposition method [11, 3]. We derive the optimal value Hopt which asymptotically minimises the total cost of method (number of floating point operations in the sequential case and execution time in the parallel case), for subdomain solvers with different complekities. Using the value of Hopt, we derive the overall complexity of the DD method, which can be significantly lower than that of the subdomain solver

关键词： UCLA OPTIMAL COARSE GRID SIZE IN DOMAIN DECOMPOSITION CAM