检索结果-南通市图书馆

Inverse limits of hereditarily almost expandable class

在线全文

学校读者我要写书评

暂无评论

Applied math.matics(A Journal of Chinese Universities) 2009年第2期24卷 237-244页

作者： ZHAO Bin dept. of math. Kashgar Teacher＇s College Kashgar 844007 China dept. of math. ＆ Informatics Faculty of Science Chiba Univ. Chiba 263 - 8522 Japan

In this paper, the hereditarily almost expandability of inverse limits is investigated, with two results obtained. Let X be the inverse limit space of an inverse system （Xα, π^αβ, ∧}. （1） Suppose X is hereditarily κ-metacompact, if each Xα is hereditarily pointwise collectionwise normal （almost θ-expandable, almost discrete θ-expandable）, then so is X; （2） Suppose X is hereditarily κ-σ-metacompact, if each Xα is hereditarily almost σ-expandable （almost discrete σ-expandable = σ-pointwise collectionwise normal）, then so is X.

关键词： inverse limit space κ-metacompactness κ-σ-metacompactness hereditarily pointwise collection- wise normal hereditarily almost θ-expandable hereditarily almost σ-expandable

THE C^k INSTABILITY OF NAVIER-STOKES EQUATION APPEND-ING POLYNOMIALS OF UNKNOWN FUNCTIONS

在线全文

学校读者我要写书评

暂无评论

Applied math.matics and Mechanics(English Edition) 2000年第12期21卷 1440-1449页

作者：何幼桦施惟慧 dept. of math. Shanghai Univ. Shanghai 210800 China

Applying the theory of stratification, the solution space structure about a class of deformed Navier-Stokes equation is determined. It is proved that such kind of equation has no C-k( k greater than or equal to2) stab... 详细信息

关键词： Navier-Stokes equation unstable equation strate transversale

在线全文

学校读者我要写书评

暂无评论

Acta math.matica Scientia 1996年第3期16卷 248-256页

作者：钟怀杰 dept. of math. Fujian Normal University Fuzhou 350007 China

The problem whether every infinite dimensional Banach space has an infinite dimensional separable quotient space has remained unsolved for a long time. In this paper we prove: the Banach space X has an infinite dimensional separable quotient if and only if X has an infinite dimensional separable quasicomplemented subspace, also if and only if there exists a Banach space Y and a bounded linear operator T is an element of B(Y,X such that the range of T is nonclosed and dense in X. Besides, the other relevant questions for such spaces e.g. the question on operator ideals that on H.I.(hereditarily indecomposable) spaces, that on invariant subspaces of operators, etc, are also discussed.

关键词： Banach space separable space quotient space bounded linear operator

STRONG　CODING　THEOREM　AND　ASYMPTOTIC　ERROR　EXPONENT　OF　ARBITRARILY　VARYING　SOURCE

在线全文

学校读者我要写书评

暂无评论

Acta math.matica Scientia 1996年第1期16卷 23-30页

作者：符方伟沈世镒 dept. of math. Nankai Univ. Tianjin 300071 China

Csiszar's strong coding theorem for discrete memoryless scarce is generalized to arbitrarily varying *** also determine the asymptotic error exponent for arbitrarily wrying source.

关键词： arbitrarily varying source,coding theorem,error exponent information quantity,types.

LIPSCHITZ-ERGODIC TRANSFORMATION

在线全文

学校读者我要写书评

暂无评论

Acta math.matica Scientia 1988年第1期8卷 113-120页

作者：邹应 dept. of math. Wuhan University

In 1977 Easton introduced the notion of Lipschitz-ergodic transformation on a compact space. In this paper we consider the Lipschitz-ergodic transformation on a measure space.

关键词： Th LIPSCHITZ-ERGODIC TRANSFORMATION De 一夕

High thermoelectric performance sheds new light on low-grade waste heat recovery

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

National Science Open 2024年第5期3卷 84-87页

作者： Wenjing Zhao Yang Wu College of math.and physics Beijing University of Chemical TechnologyBeijing 100029China

Recovering waste heat from fuel energy supply is a haunting challenge for greatly reducing the emissions of greenhouse gas CO_(2),and achieving sustainable ***,a significant amount of energy is dissipated to environment as low-grade heat(below 250~oC),largely produced in transportation and chemical engineering *** accounts for~30%of the total global energy products but is much more difficult to recycle than high-grade heat(Figure 1 A)[1].So the reuse of low-grade heat is of great importance for the future energy demands and the issue of climate change[2,3].So far,several technologies have been developed to recover low-grade waste heat,such as organic Rankine cycle,water desalination,piezoelectric,and thermoelectric conversion[4].

关键词： heat performance Rankine

THE ANALYSIS OF HOPF BIFURCATION FOR THE PREY-PREDATOR SYSTEM WITH DIFFUSION AND DELAY

在线全文

学校读者我要写书评

暂无评论

Acta math.matica Scientia 1991年第2期11卷 142-163页

作者：周笠宋开泰 dept. of math. Huazhong Univ. of Sci. & Tech. Wuhan China dept. of math. Wuhan University Wuhan China

In this paper the influence of diffusion for stability of the prey-predator system with delay is studied. We analysed the conditions which raise the Hopf bifurcation. The problem is reduced by centralmanifold, and the... 详细信息

关键词： Hopf分支时滞食饵-捕食系统稳定周期解

A LAW OF THE ITERATED LOGARITHM FOR NEAREST NEIGHBOR ESTIMATION OF MULTIVARIATE DENSITY FUNCTION

在线全文

学校读者我要写书评

暂无评论

Acta math.matica Scientia 1992年第4期12卷 472-478页

作者：洪圣岩陈规景孔繁超高集体 dept. of math. Anhui Univ Hefei 230039 China dept. of math. Univ. of Sci. & Tech. Hefei 230026 China

Let X be a d-dimensional random vector with unknown density function f(z) = f (z1, ..., z(d)), and let f(n) be teh nearest neighbor estimator of f proposed by Loftsgaarden and Quesenberry (1965). In this paper, we established the law of the iterated logarithm of f(n) for general case of d greater-than-or-equal-to 1, which gives the exact pointwise strong convergence rate of f(n).

关键词： A LAW OF THE ITERATED LOGARITHM FOR NEAREST NEIGHBOR ESTIMATION OF MULTIVARIATE DENSITY FUNCTION exp

INTERACTION OF STRONG AND WEAK SINGULARITIES FOR HYPERBOLIC SYSTEM OF CONSERVATION LAWS IN MULTIDIMENSIONAL SPACE

在线全文

学校读者我要写书评

暂无评论

Acta math.matica Scientia 1990年第3期10卷 298-302页

作者：陈恕行 dept. of math. Fudan University Shanghai China

In this paper we study the interaction of strong and weak singularities for hyperbolic system of conservation laws in multidimensional space. Under the assumption of transversal intersect of the shock front with the b... 详细信息

关键词： INTERACTION OF STRONG AND WEAK SINGULARITIES FOR HYPERBOLIC SYSTEM OF CONSERVATION LAWS IN MULTIDIMENSIONAL SPACE