Results 11 to 20 of about 3,457 (281)

Variational Principles and Methods in Theoretical Physics and Chemistry

open access: yes, 2002
This book brings together the essential ideas and methods behind applications of variational theory in theoretical physics and chemistry. The emphasis is on understanding physical and computational applications of variational methodology rather than on ...
Robert K. Nesbet
core   +2 more sources

Variational Principles of Physics and the Infinite Ramsey Theory

open access: yesPhysica Scripta
Application of the Ramsey Infinite Theorem to the variational principles of physics is discussed. According to the Ramsey Infinite Theorem,there exists the infinite, monochromatic chain of the pathways (clique), which are completely built from actual or ...
Bormashenko, Edward
core   +2 more sources

OpenOpticalFlow: An Open Source Program for Extraction of Velocity Fields from Flow Visualization Images

open access: yesJournal of Open Research Software, 2017
This paper describes OpenOpticalFlow, an open source optical flow program in Matlab for extraction of high-resolution velocity fields from various flow visualization images.
Tianshu Liu
doaj   +1 more source

Thermomechanical Variational Principles for Dissipative Materials with Application to Strain Localization in Bulk Metallic Glasses [PDF]

open access: yes, 2004
This thesis is concerned with variational principles for general coupled thermomechanical problems in dissipative materials including finite elastic and plastic deformation, non-Newtonian viscosity, rate sensitivity, arbitrary flow and hardening rule, as
Yang, Qiang
core   +1 more source

Convexity and the Euclidean Metric of Space-Time

open access: yesUniverse, 2017
We address the reasons why the “Wick-rotated”, positive-definite, space-time metric obeys the Pythagorean theorem. An answer is proposed based on the convexity and smoothness properties of the functional spaces purporting to provide the kinematic ...
Nikolaos Kalogeropoulos
doaj   +1 more source

Variational Methods for Nonsmooth Mechanics [PDF]

open access: yes, 2003
In this thesis we investigate nonsmooth classical and continuum mechanics and its discretizations by means of variational numerical and geometric methods.
Fetecau, Razvan Constantin
core   +1 more source

SPACE–TIME VARIATION OF PHYSICAL CONSTANTS AND THE EQUIVALENCE PRINCIPLE [PDF]

open access: yesInternational Journal of Modern Physics A, 2002
Location-dependence of physical parameters such as the electromagnetic fine structure constant and Newton's G produce body accelerations which violate universality of free fall rates testable with laboratory and space experiments. Theoretically related cosmological time variation of these same parameters are also constrained by experiments such as ...
openaire   +3 more sources

Variational principles for parabolic equations [PDF]

open access: yes, 1969
summary:New types of variational principles, each of them equivalent to the linear mixed problem for parabolic equation with initial and combined boundary conditions having been suggested by physicists, are discussed.
Korotov, Sergey   +4 more
core   +1 more source

Variational Principles and Nonequilibrium Thermodynamics [PDF]

open access: yes, 2020
Variational principles play a fundamental role in deriving the evolution equations of physics. They work well in the case of non-dissipative evolution, but for dissipative systems, the variational principles are not unique and not constructive.
Kovács, R.   +3 more
core   +1 more source

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