Title Ill-Posed Problems for Integrodifferential Equations in Mechanics and Electromagnetic Theory


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The contracting-mapping principle , the Schauder method , as well as other methods of non-linear functional analysis, are applied in investigations of this equation. Questions of stability of solutions, eigen-function expansions, asymptotic expansions in a small parameter, etc. Partial integro-differential and integro-differential equations with multiple integrals are often encountered in practice.

The Boltzmann and Kolmogorov—Feller equations are examples of these. Ordinary integro-differential equations are of interest e. Also, partial integro-differential equations, i. Log in. Namespaces Page Discussion. Views View View source History.


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Jump to: navigation , search. How to Cite This Entry: Integro-differential equation. Trenogin originator , Encyclopedia of Mathematics.

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This page was last modified on 7 February , at Volterra, "Una teoria matematica sulla lotta per l'esistenza" Scienta , 41 pp. It is proven that one scattering experiment is sufficient for the unique determination of the complex wavenumbers of the objects. The mapping from the scattered fields Direct and inverse problems of infrared tomography.

The problems of infrared tomography-direct the modeling of measured functions and inverse the reconstruction of gaseous medium parameters -are considered with a laboratory burner flame as an example of an application. The two measurement modes are used: active ON with an external IR source Modeling of uncertainties in statistical inverse problems.

In all real world problems , the models that tie the measurements to the unknowns of interest, are at best only approximations for reality. While moderate modeling and approximation errors can be tolerated with stable problems , inverse problems are a notorious exception.

Category: Electricity And Magnetism

Typical modeling errors include inaccurate geometry, unknown boundary and initial data, properties of noise and other disturbances, and simply the numerical approximations of the physical models. In principle, the Bayesian approach to inverse problems , in which all uncertainties are modeled as random variables, is capable of handling these uncertainties. Depending on the type of uncertainties, however, different strategies may be adopted. In this paper we give an overview of typical modeling errors and related strategies within the Bayesian framework. Bayesian probability theory and inverse problems.

Bayesian probability theory is applied to approximate solving of the inverse problems. In order to solve the moment problem with the noisy data, the entropic prior is used. The expressions for the solution and its error bounds are presented. When the noise level tends to zero, the Bayesian solution tends to the classic maximum entropy solution in the L 2 norm. The way of using spline prior is also shown. Inverse and Ill-posed Problems Theory and Applications.

The text demonstrates the methods for proving the existence if et all and finding of inverse and ill-posed problems solutions in linear algebra, integral and operator equations, integral geometry, spectral inverse problems , and inverse scattering problems.

Freddy Bloom

It is given comprehensive background material for linear ill-posed problems and for coefficient inverse problems for hyperbolic, parabolic, and elliptic equations. A lot of examples for inverse problems from physics, geophysics, biology, medicine, and other areas of application of mathematics are included. Analog fault diagnosis by inverse problem technique.

A novel algorithm for detecting soft faults in linear analog circuits based on the inverse problem concept is proposed. The proposed approach utilizes optimization techniques with the aid of sensitivity analysis. The main contribution of this work is to apply the inverse problem technique to estimate the actual parameter values of the tested circuit and so, to detect and diagnose single fault in analog circuits.

This technique can be applied to any other linear circuit and it also can be extended to be applied to non-linear circuits. Moebius inverse problem for distorted black holes. Hawking ''thermal'' radiation could be a means to detect black holes of micron sizes, which may be hovering through the universe. We consider these micro-black holes to be distorted by the presence of some distribution of matter representing a convolution factor for their Hawking radiation. One may hope to determine from their Hawking signals the temperature distribution of their material shells by the inverse black body problem.

In , Nan-xian Chen has used a so-called modified Moebius transform to solve the inverse black body problem. We discuss and apply this technique to Hawking radiation. Some comments on supersymmetric applications of Moebius function and transform are also added. Formal solutions of inverse scattering problems. The formal solutions of certain three-dimensional inverse scattering problems presented in papers I and II of this series [J. When the scattering data are sufficiently restricted, this mapping is shown to be a contraction, thereby establishing the existence, uniqueness, and continuous dependence on the data of these formal solutions.

Inverse problem of radiofrequency sounding of ionosphere. An algorithm for the solution of the inverse problem of vertical ionosphere sounding and a mathematical model of noise filtering are presented. An automated system for processing and analysis of spectrograms of vertical ionosphere sounding based on our algorithm is described. It is shown that the algorithm we suggest has a rather high efficiency.

An inverse problem in a parabolic equation. Full Text Available In this paper, an inverse problem in a parabolic equation is studied. An unknown function in the equation is related to two integral equations in terms of heat kernel. One of the integral equations is well-posed while another is ill-posed.

Matti Lassas, Scattering Problems and the Inverse Problems for Non-linear Wave Equations

A regularization approach for constructing an approximate solution to the ill-posed integral equation is proposed. Theoretical analysis and numerical experiment are provided to support the method. Differential equations inverse and direct problems. Inverse problems in classical and quantum physics. The subject of this thesis is in the area of Applied Mathematics known as Inverse Problems.

Inverse problems are those where a set of measured data is analysed in order to get as much information as possible on a model which is assumed to represent a system in the real world. We study two inverse problems in the fields of classical and quantum physics: QCD condensates from tau-decay data and the inverse conductivity problem. Despite a concentrated effort by physicists extending over many years, an understanding of QCD from first principles continues to be elusive. Fortunately, data continues to appear which provide a rather direct probe of the inner workings of the strong interactions.

We use a functional method which allows us to extract within rather general assumptions phenomenological parameters of QCD the condensates from a comparison of the time-like experimental data with asymptotic space-like results from theory.

Journal of Integral Equations and Applications

The price to be paid for the generality of assumptions is relatively large errors in the values of the extracted parameters. Although we do not claim that our method is superior to other approaches, we hope that our results lend additional confidence to the numerical results obtained with the help of methods based on QCD sum rules. EIT is a technology developed to image the electrical conductivity distribution of a conductive medium.

The technique works by performing simultaneous measurements of direct or alternating electric currents and voltages on the boundary of an object. These are the data used by an image reconstruction algorithm to determine the electrical conductivity distribution within the object. In this thesis, two approaches of EIT image reconstruction are proposed. The first is based on reformulating the inverse problem in terms of integral equations. This method uses only a single set of measurements for the reconstruction. The second approach is an algorithm based on linearisation which uses more then one set of measurements.

Full Text Available In this paper we examine an Information-Theoretic method for solving noisy linear inverse estimation problems which encompasses under a single framework a whole class of estimation methods. Under this framework, the prior information about the unknown parameters when such information exists, and constraints on the parameters can be incorporated in the statement of the problem. The method builds on the basics of the maximum entropy principle and consists of transforming the original problem into an estimation of a probability density on an appropriate space naturally associated with the statement of the problem.

This estimation method is generic in the sense that it provides a framework for analyzing non-normal models, it is easy to implement and is suitable for all types of inverse problems such as small and or ill-conditioned, noisy data. First order approximation, large sample properties and convergence in distribution are developed as well. Analytical examples, statistics for model comparisons and evaluations, that are inherent to this method, are discussed and complemented with explicit examples.

Eigenvectors phase correction in inverse modal problem. The solution of the inverse modal problem for the spatial parameters of mechanical and structural systems is heavily dependent on the quality of the modal parameters obtained from the experiments.

Analysis Of Numerical Methods

While experimental and environmental noises will always exist during modal testing, the resulting modal parameters are expected to be corrupted with different levels of noise. A novel methodology is presented in this work to mitigate the errors in the eigenvectors when solving the inverse modal problem for the spatial parameters.


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The phases of the eigenvector component were utilized as design variables within an optimization problem that minimizes the difference between the calculated and experimental transfer functions. The equation of motion in terms of the modal and spatial parameters was used as a constraint in the optimization problem. Constraints that reserve the positive and semi-positive definiteness and the inter-connectivity of the spatial matrices were implemented using semi-definite programming.

cpanel.builttospill.reclaim.hosting/jesus-personality-theory-exploring-the.php The results showed that the proposed method is superior when compared with a known method in the literature. Inverse scattering problem in turbulent magnetic fluctuations. Full Text Available We apply a particular form of the inverse scattering theory to turbulent magnetic fluctuations in a plasma.

Title Ill-Posed Problems for Integrodifferential Equations in Mechanics and Electromagnetic Theory Title Ill-Posed Problems for Integrodifferential Equations in Mechanics and Electromagnetic Theory
Title Ill-Posed Problems for Integrodifferential Equations in Mechanics and Electromagnetic Theory Title Ill-Posed Problems for Integrodifferential Equations in Mechanics and Electromagnetic Theory
Title Ill-Posed Problems for Integrodifferential Equations in Mechanics and Electromagnetic Theory Title Ill-Posed Problems for Integrodifferential Equations in Mechanics and Electromagnetic Theory
Title Ill-Posed Problems for Integrodifferential Equations in Mechanics and Electromagnetic Theory Title Ill-Posed Problems for Integrodifferential Equations in Mechanics and Electromagnetic Theory
Title Ill-Posed Problems for Integrodifferential Equations in Mechanics and Electromagnetic Theory Title Ill-Posed Problems for Integrodifferential Equations in Mechanics and Electromagnetic Theory
Title Ill-Posed Problems for Integrodifferential Equations in Mechanics and Electromagnetic Theory Title Ill-Posed Problems for Integrodifferential Equations in Mechanics and Electromagnetic Theory

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