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The local balance equations for the density, momentum, and energy of a dilute gas of elastic or inelastic hard spheres, strongly confined between two parallel hard plates are obtained. The starting point is a Boltzmann-like kinetic…

统计力学 · 物理学 2020-04-22 J. Javier Brey , P. Maynar , M. I. García de Soria

Recently, we have demonstrated a method to record the longitudinal phase-space distribution of a pulsed cryogenic buffer gas cooled beam of barium fluoride molecules. In this paper, we use this method to determine the influence of various…

Previous kinetic models had assumed that the reaction medium was reacting at random and without a turnover associated to thermodynamics exchanges, with a rigid active site on the enzyme. The experimental studies show that coupling factor 1…

生物大分子 · 定量生物学 2016-11-03 Alfred Bennun

A colloidal suspension of active Brownian particles (ABPs) driven by controllable forces into directed or persistent motions can serve as a model for understanding the biological systems. Experiments and numerical simulations are…

软凝聚态物质 · 物理学 2019-08-27 Chong Shen , Lanfang Li , Zhiyu Jiang , H. Daneil Ou-Yang

Our goal is to improve the theoretical modelling of stochastic excitation of p modes by turbulent convection. With the help of the closure model with plume (CMP) developed in a companion paper, we refine the theoretical description of the…

天体物理学 · 物理学 2009-11-11 K. Belkacem , R. Samadi , M. -J. Goupil , F. Kupka , F. Baudin

Recent research has shown that each apnea episode results in a significant rise in the beat-to-beat blood pressure and by a drop to the pre-episode levels when patient resumes normal breathing. While the physiological implications of these…

信号处理 · 电气工程与系统科学 2018-11-19 Armin Soltan Zadi , Raichel M. Alex , Rong Zhang , Donald E. Watenpaugh , Khosrow Behbehani

We evaluate entropy production in a photovoltaic cell that is modeled by four electronic levels resonantly coupled to thermally populated field modes at different temperatures. We use a formalism recently proposed, the so-called multiple…

介观与纳米尺度物理 · 物理学 2017-05-22 Mohammad H. Ansari

This paper provides a comparison between the vibrational-specific state-to-state (StS) model for nitrogen plasma elaborated in Part I of this work and conventional two-temperature (2-T) models for simulating inductively coupled plasma (ICP)…

等离子体物理 · 物理学 2024-10-21 Sanjeev Kumar , Alessandro Munafo , Sung Min Jo , Marco Panesi

The concept of entropy has been pivotal in the formulation of thermodynamics. For systems driven away from thermal equilibrium, a comparable role is played by entropy production and dissipation. Here we provide a comprehensive picture how…

软凝聚态物质 · 物理学 2025-05-15 Robin Bebon , Joshua F. Robinson , Thomas Speck

The first-passage time (FPT), i.e., the moment when a stochastic process reaches a given threshold value for the first time, is a fundamental mathematical concept with immediate applications. In particular, it quantifies the statistics of…

亚细胞过程 · 定量生物学 2018-12-05 Denis S. Grebenkov , Ralf Metzler , Gleb Oshanin

Active biological systems reside far from equilibrium, dissipating heat even in their steady state, thus requiring an extension of conventional equilibrium thermodynamics and statistical mechanics. In this Letter, we have extended the…

软凝聚态物质 · 物理学 2017-12-22 Dibyendu Mandal , Katherine Klymko , Michael R. DeWeese

Inferring the parameters of models describing biological systems is an important problem in the reverse engineering of the mechanisms underlying these systems. Much work has focused on parameter inference of stochastic and ordinary…

定量方法 · 定量生物学 2021-11-09 Thomas Thorne , Paul D. W. Kirk , Heather A. Harrington

Entropy production of an active particle in an external potential is identified through a thermodynamically consistent minimal lattice model that includes the chemical reaction providing the propulsion and ordinary translational noise. In…

统计力学 · 物理学 2017-12-01 Patrick Pietzonka , Udo Seifert

The computer-assisted modeling of re-entrant production lines, and, in particular, simulation scalability, is attracting a lot of attention due to the importance of such lines in semiconductor manufacturing. Re-entrant flows lead to…

动力系统 · 数学 2009-11-11 Y. Zou , I. G. Kevrekidis , D. Armbruster

Parkinsonism leads to various electrophysiological changes in the basal ganglia-thalamocortical system (BGTCS), often including elevated discharge rates of the subthalamic nucleus (STN) and the output nuclei, and reduced activity of the…

神经元与认知 · 定量生物学 2018-01-08 Sacha Jennifer van Albada , Peter A. Robinson

The physical chemistry of liquid-liquid phase separation (LLPS) of polymer solutions bears directly on the assembly of biologically functional droplet-like bodies from proteins and nucleic acids. These biomolecular condensates include…

生物大分子 · 定量生物学 2020-01-31 Yi-Hsuan Lin , Jacob P. Brady , Hue Sun Chan , Kingshuk Ghosh

We study the local entropy production rate and the local entropy flow in active systems composed of non-interacting run-and-tumble particles in a thermal bath. After providing generic time-dependend expressions, we focus on the stationary…

统计力学 · 物理学 2025-11-10 Matteo Paoluzzi , Andrea Puglisi , Luca Angelani

Atomic displacement parameters (ADPs) are crystallographic information that describe the statistical distribution of atoms around an atom site. Anisotropic ADPs by atom were directly derived from classical molecular dynamics (MD)…

材料科学 · 物理学 2025-05-26 Yoyo Hinuma

The electrophysiology of betacells is at the origin of insulin secretion. Betacells exhibit a complex behaviour upon stimulation with glucose including repeated and uninterrupted bursting. Mathematical modelling is most suitable to improve…

细胞行为 · 定量生物学 2007-05-23 Michael Meyer-Hermann

Warm-blooded vertebrates accumulate approximately $\Nstar \approx 10^9$ cardiac cycles over a natural lifetime, a striking empirical regularity first quantified by Lindstedt and Calder yet lacking a physical interpretation. We propose that…

统计力学 · 物理学 2026-04-28 Mesfin Taye