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An algorithm for solving initial value problems using Laplace Adomian decomposition method
Laplace Adomian decomposition method Initial value problems Symbolic computation
2010/9/14
In this paper, we present a symbolic algorithm for solving a class of nth order linear or nonlinear ordinary differential equations with initial conditions. This algorithm is based on Laplace Adomian ...
Spline collocation approach for the numerical solution of a generalized system of second-order boundary-value problems
Spline method Finite element
2010/9/15
In this paper, a spline finite element approach is manipulated for the numerical solution of an extended system of second-order boundaryvalue problems. The efficiency of the proposed method is examine...
Existencer result and numerical method for nonlinear third-order two-point boundary value problems
Existence Two-point boundary value conditions
2010/9/17
In this study, we present the existence of solution for nonlinear thirdorder differential equation with two-point boundary value conditions under more easily verified conditions than the conditions fo...
Geodesic boundary value problems with symmetry
Optimal control variational principles geodesic fows boundary value problems
2010/4/8
This paper shows how left and right actions of Lie groups on a manifold may be used to complement one another in a variational reformulation of optimal control problems equivalently as geodesic bounda...
Boundary value problems for the stationary axisymmetric Einstein equations: a rotating disk
Einsteins equations boundary-value problem integrable system rotating disk
2010/4/7
The stationary, axisymmetric reduction of the vacuum Einstein equations, the so-called Ernst equation, is an integrable nonlinear PDE in two dimensions. There now exists a general method for analyzing...
Weather regime dependence of extreme value statistics for summer temperature and precipitation
Weather regime dependence extreme value statistics summer temperature
2009/10/30
Extreme Value Theory (EVT) is a useful tool to describe the statistical properties of extreme events. Its underlying assumptions include some form of temporal stationarity in the data. Previous studie...
By means of the Bayesian decision approach the economicvalue of low flow data is
considered with special reference to the design of treatment plants for typical Danish
conditions. For a specific cas...
A Bivariate Extreme Value Distribution Applied to Flood Frequency Analysis
Bivariate Extreme Value Distribution Flood Frequency Analysis
2009/10/23
This article presents a procedure for use of the Gumbel logistic model to represent
the joint distribution of two correlated extreme events. Parameters of the
distribution are estimated using the me...
Pollen morphology of some Gypsophila L. (Caryophyllaceae) species and its taxonomic value
Caryophyllaceae Gypsophila pollen LM SEM TEM
2010/3/17
Pollen morphology of 12 taxa (6 of them endemic) that belong to the genus Gypsophila L. were investigated using light microscopy (LM), scanning electron microscopy (SEM), and transmission electron mic...
基于经验似然的Value-at-Risk模型的评价方法
Value-at-Risk 波动率 经验似然 设定检验 非嵌套检验
2009/8/31
Value-at-Risk (VaR)是度量市场风险的一个基本工具. 自从VaR概念提出以来, 涌现出大量方法用于VaR估计, 因此在统计意义下, 如何检验这些方法的有效性, 以及如何比较不同VaR模型从而选择出最好的方法, 就成为人们非常关注的问题. 本文提出了利用经验似然法来评估和比较不同的Value-at-Risk 模型. 模拟和实证分析表明经验似然方法比已有的方法有效和稳健.
S. K. Ntouyas, Boundary Value Problems for First Order Impulsive Differential Inclusions
Boundary value problem impulsive periodic antiperiodic differential inclusions fixed point
2009/6/16
In this paper, we investigate the existence of solutions for a class of first order boundary
value problems for impulsive differential inclusions. By using suitable fixed point
theorems, we study ...
Prediction of the Geomagnetic K Index Based on its Previous Value
geomagnetic forecasting geomagnetic variations K index
2009/6/9
The statistical behaviour of the geomagnetic K index is studied at two observatories in Finland:Nurmijärvi in the subauroral region and Sodankylä near the auroral region. Using data of 1953–...
Skill and relative economic value of medium-range hydrological ensemble predictions
relative economic value medium-range hydrological ensemble predictions
2009/5/7
A hydrological ensemble prediction system, integrating a water balance model with ensemble precipitation forecasts from the European Centre for Medium-Range Weather Forecasts (ECMWF) Ensemble Predicti...
Value of river discharge data for global-scale hydrological modeling
WaterGAP Global Hydrology Model river discharge data
2009/5/4
This paper investigates the value of observed river discharge data for global-scale hydrological modeling of a number of flow characteristics that are e.g. required for assessing water resources, floo...
Positive solutions for Second-Order Boundary Value Problem with Integral Boundary Conditions at Resonance on a Half-Line
Boundary value problem Resonance Cone Positive solution Coincidence
2010/1/22
This paper deals with the second order boundary value problem with integral boundary conditions on a half-line: a.e. in A new result on the existence of positive solutions is obta...