Results 21 to 30 of about 1,367,655 (261)

Hole dynamics in a photovoltaic donor-acceptor couple revealed by simulated time-resolved X-ray absorption spectroscopy

open access: yesStructural Dynamics, 2019
Theoretical and experimental methodologies that can characterize electronic and nuclear dynamics, and the coupling between the two, are needed to understand photoinduced charge transfer in molecular building blocks used in organic photovoltaics.
Khadijeh Khalili   +5 more
doaj   +1 more source

Thermodynamic Integration in 3n Dimensions Without Biases or Alchemy for Protein Interactions

open access: yesFrontiers in Physics, 2020
Thermodynamic integration (TI), a powerful formalism for computing Gibbs free energy, has been implemented for many biophysical processes with alchemical schemes that require delicate human efforts to choose/design biasing potentials for sampling the ...
Liao Y. Chen
doaj   +1 more source

Free-energy calculations [PDF]

open access: yes, 2002
The techniques that can be used to study phase diagrams numerically depend on the character of the phase transitions. In particular, there is quite a difference among the tools used to study first-order phase transitions and those applied to analyze critical phenomena near continuous phase transitions.
Daan Frenkel, Berend Smit
openaire   +1 more source

Free-energy and the brain

open access: yesSynthese, 2007
If one formulates Helmholtz's ideas about perception in terms of modern-day theories one arrives at a model of perceptual inference and learning that can explain a remarkable range of neurobiological facts. Using constructs from statistical physics it can be shown that the problems of inferring what cause our sensory input and learning causal ...
Karl J. Friston, Klaas E. Stephan
openaire   +4 more sources

Rényi Entropy and Free Energy

open access: yesEntropy, 2022
The Rényi entropy is a generalization of the usual concept of entropy which depends on a parameter q. In fact, Rényi entropy is closely related to free energy. Suppose we start with a system in thermal equilibrium and then suddenly divide the temperature by q.
openaire   +5 more sources

Molecular simulation of rapid translocation of cholesterol, diacylglycerol, and ceramide in model raft and nonraft membranes

open access: yesJournal of Lipid Research, 2012
The translocation of lipids across membranes (flip-flop) is an important biological process. Slow exchange on a physiological timescale allows the creation of asymmetric distributions of lipids across cellular membranes.
W. F. Drew Bennett, D. Peter Tieleman
doaj   +1 more source

Harnessing the Bethe free energy

open access: yesRandom Structures & Algorithms, 2016
ABSTRACTA wide class of problems in combinatorics, computer science and physics can be described along the following lines. There are a large number of variables ranging over a finite domain that interact through constraints that each bind a few variables and either encourage or discourage certain value combinations.
Bapst, Victor, Coja-Oghlan, Amin
openaire   +6 more sources

Cluster expansion for the description of condensed state: crystalline cell approach

open access: yesCondensed Matter Physics, 2018
A well-known cluster expansion, which leads to virial expansion for the free energy of low density systems, is modified in such a way that it becomes applicable to the description of condensed state of matter.
G.S. Bokun, M.F. Holovko
doaj   +1 more source

Free Energy, Value, and Attractors

open access: yesComputational and Mathematical Methods in Medicine, 2012
It has been suggested recently that action and perception can be understood as minimising the free energy of sensory samples. This ensures that agents sample the environment to maximise the evidence for their model of the world, such that exchanges with the environment are predictable and adaptive.
Karl J. Friston, Ping Ao
openaire   +2 more sources

Construction and Numerical Realization of a Magnetization Model for a Magnetostrictive Actuator Based on a Free Energy Hysteresis Model

open access: yesApplied Sciences, 2019
Giant magnetostrictive actuators (GMA) driven by giant magnetostrictive material (GMM) has some advantages such as a large strain, high precision, large driving force, fast response, high reliability, and so on, and it has become the research hotspot in ...
Zhen Yu   +4 more
doaj   +1 more source

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