Results 41 to 50 of about 66,560 (316)

Different Groups of Variational Principles for Whitham-Broer-‎Kaup Equations in Shallow Water [PDF]

Journal of Applied and Computational Mechanics, 2020
Because the variational theory is the theoretical basis for many kinds of analytical or numerical methods, it is an essential but difficult task to seek explicit functional formulations whose extrema are sought by the nonlinear and complex models. By the
Xiao-Qun Cao, Ya-Nan Guo, Cheng-Zhuo Zhang, Shi-Cheng Hou, Ke-Cheng Peng   +4 more
doaj   +1 more source

On analysis error covariances in variational data assimilation [PDF]

, 2008
The problem of variational data assimilation for a nonlinear evolution model is formulated as an optimal control problem to find the initial condition function (analysis).
Shutyaev, V., Gejadze, Igor, Gejadze, I.Y., Shutyaev, Victor P., Le Dimet, François-Xavier, Le-Dimet, F.   +5 more
core   +1 more source

Performance comparison between maximum likelihood estimation and variational method for estimating simple linear regression parameter [PDF]

ITM Web of Conferences
Variational estimation method is a deterministic approximation technique which involves Bayesian framework while giving a point estimate instead of the usual Bayesian interval estimation. The linear regression model, which has always been a popular model,
Widyaningsih Yekti, Rizka Hakiim Nur, Siswantining Titin   +2 more
doaj   +1 more source

Crystalline variational methods [PDF]

Proceedings of the National Academy of Sciences, 2002
A surface free energy function is defined to be crystalline if its Wulff shape (the equilibrium crystal shape) is a polyhedron. All the questions that one considers for the area functional, where the surface free energy per unit area is 1 for all normal directions, can be considered for crystalline surface free energies.
openaire   +2 more sources

Variational Methods for Normal Integration [PDF]

Journal of Mathematical Imaging and Vision, 2017
The need for an efficient method of integration of a dense normal field is inspired by several computer vision tasks, such as shape-from-shading, photometric stereo, deflectometry, etc. Inspired by edge-preserving methods from image processing, we study in this paper several variational approaches for normal integration, with a focus on non-rectangular
Yvain Quéau, Jean-Denis Durou, Jean-François Aujol   +2 more
openaire   +4 more sources

On optimal solution error covariances in variational data assimilation problems [PDF]

, 2010
The problem of variational data assimilation for a nonlinear evolution model is formulated as an optimal control problem to find unknown parameters such as distributed model coefficients or boundary conditions. The equation for the optimal solution error
Le Dimet, F.X., Shutyaev, V., Gejadze, Igor, Gejadze, I.Y., Shutyaev, Victor P., Le Dimet, François-Xavier, (Funder), Scottish Founding Council via GRPE   +6 more
core   +1 more source

Optimal solution error covariance in highly nonlinear problems of variational data assimilation [PDF]

, 2012
The problem of variational data assimilation for a nonlinear evolution model is formulated as an optimal control problem (see, e.g.[1]) to find the initial condition, boundary conditions or model parameters.
Le Dimet, F.X., G. J. M. Copeland, Shutyaev, V., Gejadze, Igor, F.-X. Le Dimet, V. Shutyaev, I. Gejadze, Shutyaev, Victor P., Copeland, G., Le Dimet, François-Xavier, Gejadze, I, Copeland, G.J.M   +11 more
core   +1 more source

Variational Homotopy Perturbation Method for Solving Fractional Initial Boundary Value Problems

Abstract and Applied Analysis, 2012
A variational homotopy perturbation method (VHPM) which is based on variational iteration method and homotopy perturbation method is applied to solve the approximate solution of the fractional initial boundary value problems.
Yanqin Liu
doaj   +1 more source

On the convergence of adaptive nonconforming finite element methods for a class of convex variational problems [PDF]

, 2011
We formulate and analyze an adaptive nonconforming finite element method for the solution of convex variational problems. The class of minimization problems we admit includes highly singular problems for which no Euler–Lagrange equation (or inequality ...
Christoph Ortner, Ortner, Christoph, Praetorius, Dirk, Dirk Praetorius   +3 more
core   +1 more source

Association Between Dinutuximab Beta Exposure and Post‐End‐of‐Treatment Survival in Neuroblastoma: A Weighted Patient‐Level Analysis of Three Clinical Studies

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Objectives The association between exposure to dinutuximab beta (DB) and event‐free survival (EFS) or overall survival (OS) of neuroblastoma patients was assessed using data collected during three clinical trials (five cohorts). Methods A systematic review (March 2026) was conducted to identify relevant studies (prospective; registered DB ...
Przemysław Holko, Holger N. Lode, Alberto Garaventa, Carla Manzitti, Roberto Luksch, Dominique Valteau‐Couanet, Marion Gambart, John Anderson, Juliet Gray, Adela Canete, Lucas Moreno, Aleksandra Wieczorek, Cormac Owens, Shifra Ash, Isaac Yaniv, Genevieve Laureys, Hans Loibner, Katarzyna Śladowska, Ruth Ladenstein, Paweł Kawalec   +19 more
wiley   +1 more source