首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 15 毫秒
1.
2.
Considering a series representation of a coherent system using a shift transform of the components lifetime Ti, at its critical level Yi, we study two problems. First, under such a shift transform, we analyse the preservation properties of the non-parametric distribution classes and secondly the association preserving property of the components lifetime under such transformations.  相似文献   

3.
The converse comparison theorem has received much attention in the theory of backward stochastic differential equations (BSDEs). However, no such theorem has been proved for anticipated BSDEs. In this paper, we derive a converse comparison theorem by first giving an existence and uniqueness theorem for adapted solutions of anticipated BSDEs with a stopping time and then related to (f,δ)(f,δ)-expectations induced by anticipated BSDEs.  相似文献   

4.
For a Tychonoff space X  , we denote by Cp(X)Cp(X) and Cc(X)Cc(X) the space of continuous real-valued functions on X equipped with the topology of pointwise convergence and the compact-open topology respectively. Providing a characterization of the Lindelöf Σ-property of X   in terms of Cp(X)Cp(X), we extend Okunev?s results by showing that if there exists a surjection from Cp(X)Cp(X) onto Cp(Y)Cp(Y) (resp. from Lp(X)Lp(X) onto Lp(Y)Lp(Y)) that takes bounded sequences to bounded sequences, then υY is a Lindelöf Σ-space (respectively K-analytic) if υX has this property. In the second part, applying Christensen?s theorem, we extend Pelant?s result by proving that if X is a separable completely metrizable space and Y   is first countable, and there is a quotient linear map from Cc(X)Cc(X) onto Cc(Y)Cc(Y), then Y   is a separable completely metrizable space. We study also a non-separable case, and consider a different approach to the result of J. Baars, J. de Groot, J. Pelant and V. Valov, which is based on the combination of two facts: Complete metrizability is preserved by ?p?p-equivalence in the class of metric spaces (J. Baars, J. de Groot, J. Pelant). If X   is completely metrizable and ?p?p-equivalent to a first-countable Y, then Y is metrizable (V. Valov). Some additional results are presented.  相似文献   

5.
6.
For ΩΩ, an open bounded subset of RNRN with smooth boundary and 1<p<∞1<p<, we establish W1,p(Ω)W1,p(Ω)a priori bounds and prove the compactness of solution sets to differential inequalities of the form
|divA(x,∇u)|≤F(x,u,∇u),|divA(x,u)|F(x,u,u),
which are bounded in L(Ω)L(Ω). The main point in this work is that the nonlinear term FF may depend on ∇uu and may grow as fast as a power of order pp in this variable. Such growth conditions have been used extensively in the study of boundary value problems for nonlinear ordinary differential equations and are known as Bernstein–Nagumo growth conditions. In addition, we use these results to establish a sub-supersolution theorem.  相似文献   

7.
This paper is concerned with Riemann–Liouville abstract fractional Cauchy Problems with damping. The notion of Riemann–Liouville fractional (α,β,c)(α,β,c) resolvent is developed, where 0<β<α≤10<β<α1. Some of its properties are obtained. By combining such properties with the properties of general Mittag-Leffler functions, existence and uniqueness results of the strong solution of Riemann–Liouville abstract fractional Cauchy Problems with damping are established. As an application, a fractional diffusion equation with damping is presented.  相似文献   

8.
We characterize the Banach spaces Y   for which certain subspaces of operators from L1(μ)L1(μ) into Y have the Bishop–Phelps–Bollobás property in terms of a geometric property of Y, namely AHSP. This characterization applies to the spaces of compact and weakly compact operators. New examples of Banach spaces Y with AHSP are provided. We also obtain that certain ideals of Asplund operators satisfy the Bishop–Phelps–Bollobás property.  相似文献   

9.
An application of the “generalized Zernike or disc polynomials”, recently introduced in the literature, is shown, resorting to the Lie algebra based investigation of the dynamics of quantum systems driven by two-mode interaction Hamiltonians. Further properties of the associated “disc functions” are deduced. Also, a generalization of the disc polynomials towards the Hahn polynomials is suggested.  相似文献   

10.
In this paper we study the edge-magicness of graphs with equal size and order, and we use such graphs and digraph products in order to construct labelings of different classes and of different graphs. We also study super edge-magic labelings of 22-regular graphs with exactly two components and their implications to other labelings.  相似文献   

11.
12.
In this paper we introduce a new family of measures of divergence for the analysis of the degree of departure from a model with a constant hazard function and also for comparing if two models have proportional hazard rates. Our family of measures is based on the family of divergences introduced by Burbea and Rao (see [J. Burbea, C.R. Rao, On the convexity of higher order Jensen differences based on entropy functions, IEEE Transactions on Information Theory 28 (1982) 961–963]). Some well-known sets of data are reanalyzed using the new families of test statistics and confidence intervals introduced in this paper.  相似文献   

13.
14.
We utilize the classical hypercircle method and the lowest-order Raviart–Thomas H(div)H(div) element to obtain a posteriori error estimates of the P1P1 finite element solutions for 2D Poisson's equation. A few other estimation methods are also discussed for comparison. We give some theoretical and numerical results to see the effectiveness of the methods.  相似文献   

15.
In this work, we study the existence and regularity of solutions for some partial functional integrodifferential equations in Banach spaces. We suppose that the undelayed part admits a resolvent operator in the sense given by Grimmer in [R. Grimmer, Resolvent operators for integral equations in a Banach space, Transaction of American Mathematical Society 273 (1982) 333–349]. The delayed part is assumed to be locally Lipschitz. Firstly, we show the existence of the mild solutions. Secondly, we give sufficient conditions ensuring the existence of the strict solutions.  相似文献   

16.
This paper studies the coincidence of the τωτω and τδτδ topologies on the space of holomorphic functions defined on an open subset U   of a Banach space. Dineen and Mujica proved that τω=τδτω=τδ when U   is a balanced open subset of a separable Banach space with the bounded approximation property. Here, we study the τω=τδτω=τδ problem for several types of non-balanced domains U.  相似文献   

17.
In the 1980s, Motorola, Inc. introduced its Six Sigma quality program to the world. Some quality practitioners questioned why the Six Sigma advocates claim it is necessary to add a 1.5σ shift to the process mean when estimating process capability. Bothe [Bothe, D.R., 2002. Statistical reason for the 1.5σ shift. Quality Engineering 14 (3), 479–487] provided a statistical reason for considering such a shift in the process mean for normal processes. In this paper, we consider gamma processes which cover a wide class of applications. For fixed sample size n, the detection power of the control chart can be computed. For small process mean shifts, it is beyond the control chart detection power, which results in overestimating process capability. To resolve the problem, we first examine Bothe’s approach and find the detection power is less than 0.5 when data comes from gamma distribution, showing that Bothe’s adjustments are inadequate when we have gamma processes. We then calculate adjustments under various sample sizes n and gamma parameter N, with power fixed to 0.5. At the end, we adjust the formula of process capability to accommodate those shifts which can not be detected. Consequently, our adjustments provide much more accurate capability calculation for gamma processes. For illustration purpose, an application example is presented.  相似文献   

18.
In this paper, the approximation characteristic of a diagonal matrix in probabilistic and average case settings is investigated. And the asymptotic degree of the probabilistic linear (n,δ)(n,δ)-width and pp-average linear nn-width of diagonal matrix MM are determined.  相似文献   

19.
20.
We give a constructive proof that any σ  -porous subset of a Hilbert space has Lebesgue measure zero on typical C1C1 curves. Further, we discover that this result does not extend to all forms of porosity; we find that even power-p   porous sets may meet many C1C1 curves in positive measure.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号