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101.
一类描述混沌映射的符号动力系统 总被引:11,自引:0,他引:11
本文定义了符号空间上的拟移位映射,并用该类映射描述了Cantor集及平面Cantor集上的混沌映射,本文结果可看作Smale马蹄模型的简化。 相似文献
102.
梯度折射率棒透镜的色差模型 总被引:1,自引:0,他引:1
本文提出一个梯度折射率棒透镜(GRIN-RodLens)的色差模型,并运用本模型合理地解释了在色差测量过程发现的各类色差现象. 相似文献
103.
综合国力的数学建模 总被引:2,自引:0,他引:2
王树禾 《高校应用数学学报(A辑)》1997,(1):29-36
本文考虑社会文明与社会导恶现象的制约机制,建立一个综合国力的非线性数学模型,从数学上讨论了相应的二次微分系统的Hopf分叉,中心与细焦点的判定,极限环的存在唯一性等问题,并对数学结论予以合理解释,把社会相平面划成社发展区域,社会动荡区域和社会崩溃区域,研讨社会走向,确定纳入社会发展区域的途径。 相似文献
104.
A finite element model to tackle the moving boundary problem of wave run-up on moderately steep slopes is developed. The special aspects considered in this study are (1) the modification of shallow water equations to accommodate the effect of vertical accelerations and (2) the use of Lagrangian acceleration coupled with an element that adapts itself to the moving boundary closely. The pressure term in the one-dimensional momentum equation is derived using the Eulerian equation in the vertical direction. This takes care of the vertical accelerations which are significant during the motion of a wave on moderately steep slopes. The element near the boundary is allowed to change its dimension so that the fluid boundary is closely followed. Such a flexible element precludes the need for approximation of the variables with regard to the indefinite position of the boundary. This element is split into two when its dimension becomes unduly large compared to the unchanging elements. The need for such a splitting is shown by an examination of the entries in the global matrix. Results of water profile as a wave runs up a structure are given. A brief history of the work on similar problems is outlined. 相似文献
105.
106.
Small bimetallic Pd-Fe particles supported on a well ordered alumina film grown on NiAl (1 1 0) were studied focusing on the geometric, electronic, adsorption, as well as magnetic properties. The morphology, growth mode and surface composition were investigated by combining scanning tunneling microscopy (STM), temperature-programmed desorption (TPD) and infrared spectroscopy (IRAS) using CO as a probe molecule. Information on the electronic properties of the bimetallic systems was obtained by means of X-ray photoelectron spectroscopy (XPS). These measurements were amended by in situ ferromagnetic resonance spectroscopy to address the magnetic properties of the bimetallic particles. The subsequent deposition of the metals at 300 K varying the order of metal deposition resulted in two distinct bimetallic systems. Pd deposited on existing Fe particles forms a shell, however, FMR and XPS suggest that intermixing of Pd and Fe occurs to some extent. For the reverse order, a larger amount of Fe is required to coat Pd particles, due to the strong tendency of Pd to segregate to the surface of the particles. 相似文献
107.
A lot of importance has been attached to the testing phase of the Software Development Life Cycle (SDLC). It is during this phase it is checked whether the software product meets user requirements or not. Any discrepancies that are identified are removed. But testing needs to be monitored to increase its effectiveness. Software Reliability Growth Models (SRGMs) that specify mathematical relationships between the failure phenomenon and time have proved useful. SRGMs that include factors that affect failure process are more realistic and useful. Software fault detection and removal during the testing phase of SDLC depend on how testing resources (test cases, manpower and time) are used and also on previously identified faults. With this motivation a Non-Homogeneous Poisson Process (NHPP) based SRGM is proposed in this paper which is flexible enough to describe various software failure/reliability curves. Both testing efforts and time dependent fault detection rate (FDR) are considered for software reliability modeling. The time lag between fault identification and removal has also been depicted. The applicability of our model is shown by validating it on software failure data sets obtained from different real software development projects. The comparisons with established models in terms of goodness of fit, the Akaike Information Criterion (AIC), Mean of Squared Errors (MSE), etc. have been presented. 相似文献
108.
D. Michael Heinekey 《Journal of organometallic chemistry》2009,694(17):2671-1091
Recent developments in active site structure determination of the three types of hydrogenase enzymes are described. Aspects of recent studies using model complexes relevant to the structure and function of the enzymes are reviewed. 相似文献
109.
Shear banding occurs in the flow of complex fluids: various types of shear thinning and shear thickening micelle solutions
and liquid crystals. In order to cope with the strongly inhomogeneous interface between the bands, constitutive models used
in standard rheology must be supplemented by non-local terms. This leads rather generally to non-linear partial differential
equations of the reaction-diffusion type. We use this formalism in order to explain some observed experimental features and
as a guide for future research in this field.
Received: 17 May 1999/Accepted: 3 August 1999 相似文献
110.
The problem of estimating the number of hidden states in a hidden Markov model is considered. Emphasis is placed on cross-validated
likelihood criteria. Using cross-validation to assess the number of hidden states allows to circumvent the well-documented
technical difficulties of the order identification problem in mixture models. Moreover, in a predictive perspective, it does
not require that the sampling distribution belongs to one of the models in competition. However, computing cross-validated
likelihood for hidden Markov models for which only one training sample is available, involves difficulties since the data
are not independent. Two approaches are proposed to compute cross-validated likelihood for a hidden Markov model. The first
one consists of using a deterministic half-sampling procedure, and the second one consists of an adaptation of the EM algorithm
for hidden Markov models, to take into account randomly missing values induced by cross-validation. Numerical experiments
on both simulated and real data sets compare different versions of cross-validated likelihood criterion and penalised likelihood
criteria, including BIC and a penalised marginal likelihood criterion. Those numerical experiments highlight a promising behaviour
of the deterministic half-sampling criterion. 相似文献