Results 91 to 100 of about 11,401 (255)

Inverse conductivity problem on Riemann surfaces [PDF]

, 2008
An electrical potential U on a bordered Riemann surface X with conductivity function sigma>0 satisfies equation d(sigma d^cU)=0. The problem of effective reconstruction of sigma is studied.
Henkin, Gennadi, Michel, Vincent
core   +1 more source

Two-Dimensional Riemann Problem for Scalar Conservation Laws [PDF]

, 2002
Using the generalized characteristic analysis method, we study the two-dimensional Riemann problem for scalar conservation laws, which is nonconvex along the y direction, and interactions of its elementary waves, give the classification of initial ...
Sheng, Wancheng
core   +1 more source

Sleep hygiene and sleep control mediate the relationship between cognitive fusion and insomnia severity

British Journal of Clinical Psychology, EarlyView.
Abstract Objectives Insomnia is associated with mental ill health, worry and rumination—the two latter contribute to pre‐sleep cognitive arousal. These variables also associate with psychological inflexibility, including cognitive fusion (CF), a literal attachment to unhelpful thoughts, patterns and rules.
Amanda L. Richdale, Francesco R. De Maria, Eric M. J. Morris   +2 more
wiley   +1 more source

Solving the solution of Goursat problem using the Riemann method for a system of fourth order hyperbolic differential equations

Вестник Самарского университета: Естественнонаучная серия
Boundary value problems for certain systems of hyperbolic-type differential equations can be effectively solved using the Riemann method. In this paper, we consider an approach for constructing the Riemann matrix for a system of fourth order hyperbolic ...
Ju. O. Yakovleva
doaj   +1 more source

Точные формулы и оценки для экстремальных длин семейств канонических петель на компактных римановых поверхностях [PDF]

Проблемы анализа, 2001
Рассматривается задача вычисления экстремальных длин гомотопических классов замкнутых кривых на компактных римановых поверхностях. Приводятся выражения и оценки для экстремальных длин семейств кривых на торе, а также на компактных римановых поверхностях ...
Граф С. Ю.
doaj  

Refining effect size measures and classification for differential item functioning: Toward unified guidelines across methods

British Journal of Mathematical and Statistical Psychology, EarlyView.
Abstract Differential Item Functioning (DIF) analysis is used to identify potentially biased items in multi‐item measurements. In addition to testing the statistical significance, it is essential to evaluate the practical significance of DIF through effect size measures.
Michaela Cichrová, Adéla Hladká, Patrícia Martinková   +2 more
wiley   +1 more source

On Riemann method for solving a mixed problem

Vestnik Samarskogo Gosudarstvennogo Tehničeskogo Universiteta. Seriâ: Fiziko-Matematičeskie Nauki, 2007
The formula for solution of a problem for an equation with the higher partial derivative of the general type is constructed using Riemann method. In this problem the solution is found in the characteristic parallelepiped with separated by the non ...
A. N. Mironov
doaj   +1 more source

Real‐Time Conformal Maps and Parameterizations

Computer Graphics Forum, EarlyView.
Abstract We present a simple algorithm to conformally map between two simple and bounded planar domains based on the concept of harmonic measure, which is a conformal invariant. With suitable preprocessing, the algorithm is fast enough to compute all possible conformal maps (having three real degrees of freedom) between the two domains in real time in
Q. Chang, C. Gotsman, K. Hormann
wiley   +1 more source

Difference and the Liberation of Sufficient Reason

European Journal of Philosophy, EarlyView.
Abstract The Principle of Sufficient Reason (PSR) holds that every event and entity can be explained by a sufficient reason or cause. Philosophers have long struggled with the question of the PSR's compatibility with freedom, for if what occurs or exists follows necessarily from its sufficient reason then it seems it could not have been otherwise ...
Louis Matheou
wiley   +1 more source

Analytical and numerical methods for the Riemann problem [PDF]

, 2003
In this survey we consider the classical and new methods for computing the analytical and numerical solutions to the Riemann problem, a class of boundary value problems for analytic functions, in a simply connected region Ω+ with smooth boundary Π...
Murid, Ali Hassan Mohamed, S. Nasser, Mohamed M., Mohamed Murid, Ali Hassan, Nasser, Mohamed M. S.   +3 more
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