Results 101 to 110 of about 3,263,025 (375)
Journal of Applied Clinical Medical Physics, EarlyView.Abstract Purpose Due to the tight curvature in their design, ring applicators are usually associated with large positioning errors. The standard practice to correct for these deviations based on global offsets may not be sufficient to comply with the recommended tolerance.
Leon G. Aldrovandi +3 more
wiley +1 more source
Observability for initial value problems with sparse initial data
Applied and Computational Harmonic Analysis, 2011 In this work we introduce the concept of $s$-sparse observability for large systems of ordinary differential equations. Let $\dot x=f(t,x)$ be such a system. At time $T>0$, suppose we make a set of observations $b=Ax(T)$ of the solution of the system with initial data $x(0)=x^0$, where $A$ is a matrix satisfying the restricted isometry property. The
openaire +3 more sources
Initial-Boundary Value Problem and Stability of Solutions for String Baryon Model "Triangle" [PDF]
arXiv, 1999 For the string baryon model "triangle" the initial-boundary value problem is stated and solved in general. This problem implies defining a classical motion of the system on the base of given initial position and initial velocities of string points. The presented solution reduces the initial-boundary value problem for the considered model to the system ...
arxiv
, 2012 In this paper, some modifications of Adomian decomposition method are presented for solving initial value problems in ordinary differential equations. Also, the restarted and two-step methods are applied to the problem.
M. Almazmumy +3 more
semanticscholar +1 more source
Comprehensive clinical evaluation of novel 4DCT‐based lung function imaging methods
Journal of Applied Clinical Medical Physics, EarlyView.Abstract Purpose Methods have been developed that apply image processing to 4DCTs to generate 4DCT‐ventilation/perfusion lung imaging. Traditional methods for 4DCT‐ventilation rely on Hounsfield‐Unit (HU) density‐change methods and suffer from poor numerical robustness while not providing 4DCT‐perfusion data.
Ehsan Golkar +6 more
wiley +1 more source
A class of related Dirichlet and initial value problems [PDF]
, 1969 L. R. Bragg, John W. Dettman
openalex +2 more sources
Convolutions with probability densities and applications to PDEs
Electronic Journal of Differential Equations, 2017 In this article we introduce several new convolution operators, generated by some known probability densities. By using the inverse Fourier transform and taking inverse steps (in the analogues of the classical procedures used for example in the heat ...
Sorin G. Gal
doaj
Initial-boundary value problem to 2D Boussinesq equations for MHD convection with stratification effects [PDF]
arXiv, 2017 This paper is concerned with the initial-boundary value problem to 2D magnetohydrodynamics-Boussinesq system with the temperature-dependent viscosity, thermal diffusivity and electrical conductivity. First, we establish the global weak solutions under the minimal initial assumption.
arxiv
Positive Solutions of an Initial Value Problem for Nonlinear Fractional Differential Equations
, 2012 We investigate the existence and multiplicity of positive solutions for the nonlinear fractional differential equation initial value problem , where is the standard Riemann-Liouville differentiation and is continuous. By using some fixed-point results on
D. Baleanu, H. Mohammadi, S. Rezapour
semanticscholar +1 more source
Design and validation of a novel dosimetry phantom for motion management audits
Journal of Applied Clinical Medical Physics, EarlyView.Abstract Background We present a novel phantom design for conducting end‐to‐end dosimetry audits for respiratory motion management of two anatomical treatment sites. The design enables radiochromic film measurements of the dose administered to the target throughout the respiratory cycle (motion‐included) and the dose delivered to the time‐averaged ...
Alex Burton +5 more
wiley +1 more source