scholarly journals Quasidifferential equation controllability

2009 ◽  
pp. 90-100
Author(s):  
V.A. Zaitsev ◽  
Keyword(s):  
Quasidifferential Equation

scholarly journals Geometric aspects of high-order eigenvalue problems I. Structures on spaces of boundary conditions

2004 ◽  
Vol 2004 (13) ◽  
pp. 647-678 ◽  
Author(s):  
Xifang Cao ◽  
Hongyou Wu
Keyword(s):  
Boundary Condition ◽  
Boundary Conditions ◽  
Complex Number ◽  
Geometric Structure ◽  
Eigenvalue Problems ◽  
Arbitrary Order ◽  
High Order ◽  
Manifold Structure ◽  
Complex Boundary ◽  
Quasidifferential Equation

We consider some geometric aspects of regular eigenvalue problems of an arbitrary order. First, we clarify a natural geometric structure on the space of boundary conditions. This structure is the base for studying the dependence of eigenvalues on the boundary condition involved, and reveals new properties of these eigenvalues. Then, we solve the selfadjointness condition explicitly and obtain a manifold structure on the space of selfadjoint boundary conditions and several other consequences. Moreover, we give complete characterizations of several subsets of boundary conditions such as the set of all complex boundary conditions having a given complex number as an eigenvalue, and describe some of them topologically. The shapes of some of these subsets are shown to be independent of the quasidifferential equation in question.

scholarly journals Boundary problem for the singular heat equation

2017 ◽  
Vol 9 (1) ◽  
pp. 86-91 ◽  
Author(s):  
O.V. Makhnei
Keyword(s):  
Boundary Value Problem ◽  
Boundary Conditions ◽  
Heat Equation ◽  
Boundary Problem ◽  
Mixed Problem ◽  
Boundary Value ◽  
Fourier Method ◽  
Inhomogeneous Equation ◽  
Quasidifferential Equation ◽  
Investigation Process

The scheme for solving of a mixed problem with general boundary conditions is proposed for a heat equation \[a(x)\frac{\partial T}{\partial \tau}= \frac{\partial}{\partial x} \left(\lambda(x)\frac{\partial T}{\partial x}\right)\] with coefficient $a(x)$ that is thegeneralized derivative of a function of bounded variation, $\lambda(x)>0$, $\lambda^{-1}(x)$ is a bounded and measurable function. The boundary conditions have the form $$\left\{ \begin{array}{l}p_{11}T(0,\tau)+p_{12}T^{[1]}_x (0,\tau)+ q_{11}T(l,\tau)+q_{12}T^{[1]}_x (l,\tau)= \psi_1(\tau),\\p_{21}T(0,\tau)+p_{22}T^{[1]}_x (0,\tau)+ q_{21}T(l,\tau)+q_{22}T^{[1]}_x (l,\tau)= \psi_2(\tau),\end{array}\right.$$ where by $T^{[1]}_x (x,\tau)$ we denote the quasiderivative $\lambda(x)\frac{\partial T}{\partial x}$. A solution of this problem seek by thereduction method in the form of sum of two functions $T(x,\tau)=u(x,\tau)+v(x,\tau)$. This method allows to reduce solving of proposed problem to solving oftwo problems: a quasistationary boundary problem with initialand boundary conditions for the search of the function $u(x,\tau)$ and a mixed problem with zero boundaryconditions for some inhomogeneous equation with an unknown function $v(x,\tau)$. The first of these problems is solved through the introduction of the quasiderivative. Fourier method andexpansions in eigenfunctions of some boundary value problem forthe second-order quasidifferential equation $(\lambda(x)X'(x))'+ \omega a(x)X(x)=0$ are used for solving of the second problem. The function $v(x,\tau)$ is represented as a series in eigenfunctions of this boundary value problem. The results can be used in the investigation process of heat transfer in a multilayer plate.

scholarly journals Asymptotics of a fundamental solution system for a quasidifferential equation with measures on the semiaxis

2014 ◽  
Vol 6 (1) ◽  
pp. 113-122
Author(s):  
O.V. Makhnei
Keyword(s):  
Fundamental Solution ◽  
Boundary Value Problem ◽  
Boundary Value ◽  
Asymptotic Formulas ◽  
Solution System ◽  
Asymptotics Of Eigenvalues ◽  
Eigenvalues And Eigenfunctions ◽  
Quasidifferential Equation

With the help of a conception of quasiderivatives asymptotic formulas for a fundamental solution system of a quasidifferential equation with measures on the semiaxis $[0,\infty)$ are constructed. The obtained asymptotic formulas allow to investigate asymptotics of eigenvalues and eigenfunctions of the corresponding boundary value problem.

Q-compensated reverse time migration in viscoacoustic media including surface topography

Geophysics ◽  
2019 ◽  
Vol 84 (4) ◽  
pp. S201-S217 ◽  
Author(s):  
Yingming Qu ◽  
Jinli Li
Keyword(s):  
Seismic Wave ◽  
Seismic Wave Propagation ◽  
Frequency Noise ◽  
Reverse Time ◽  
Reverse Time Migration ◽  
High Quality ◽  
Data Set ◽  
Time Migration ◽  
Quasidifferential Equation ◽  
Strong Scattering

Conventional reverse time migration (RTM) may not produce high-quality images in areas with attenuation and severe topography because severe topographic surfaces have a great impact on seismic wave simulation, resulting in strong scattering and diffraction waves, and anelastic properties of the earth affect the kinematics and dynamics of seismic wave propagation. To overcome these problems, we have developed a [Formula: see text]-compensated topographic RTM method. In this method, a new viscoacoustic quasidifferential equation is introduced to simulate forward- and backward-propagated wavefields. The viscoacoustic equation has a lossy term and a dispersion term without memory variables, and it is solved by a hybrid spatial partial derivative scheme. A new stabilization operator is derived and substituted into the [Formula: see text]-compensated viscoacoustic quasidifferential equation to suppress high-frequency noise during the attenuated wavefield compensation. Numerical tests on a sag attenuating topographic model and an attenuating topographic Marmousi2 model demonstrate that our [Formula: see text]-compensated topographic RTM can produce accurate and high-quality images by correcting the anelastic amplitude loss and phase-dispersion effects. Finally, our method is tested on a field data set.

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