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A generalized kinetic model equation which takes into account the frequency depence of the thermal conductivity is used to analyze the problem of sound propagation in dilute polyatomic gases. By comparing the theoretical results with some…

流体动力学 · 物理学 2015-06-15 Sebastian Fischer , Wilson Marques

For accurately obtaining the relationship between the carrier mobility and the applied electric field, a new multi-layer sample has been designed. Polyvinyl fluoride (PVF) films were hot pressed on both sides of linear low density…

应用物理 · 物理学 2018-03-21 Hui Zhao , Yewen Zhang , Jia Meng , Feihu Zheng , Zhenlian An

Accurate phase estimation at the edge of data segments is crucial for EEG applications such as EEG-TMS in offline and real-time data analysis. Our research evaluates the phase estimation performance of four commonly used methods…

神经元与认知 · 定量生物学 2026-04-03 Miriam Kirchhoff , Johanna Rösch , Maria Ermolova , Oskari Ahola , Sarah Harders , Juliana Hougland , Ulf Ziemann

Piezoelectric micromachined ultrasound transducers (PMUTs) have gained popularity in the past decade as acoustic transmitters and receivers. As these devices usually operate at resonance, they can deliver large output sound pressures with…

应用物理 · 物理学 2021-08-11 Bibhas Nayak , Harshvardhan Gupta , Kaustav Roy , Anuj Ashok , Vijayendra Shastri , Rudra Pratap

This work studies scattering-induced elastic wave attenuation and phase velocity variation in 3D untextured cubic polycrystals with statistically equiaxed grains using the theoretical second-order approximation (SOA) and Born approximation…

经典物理 · 物理学 2022-02-17 Ming Huang , Peter Huthwaite , Stanislav I. Rokhlin , Michael J. S. Lowe

Porous acoustic absorbers have excellent properties in the low-frequency range when positioned in room edges, therefore they are a common method for reducing low-frequency reverberation. However, standard room acoustic simulation methods…

The analysis of high spectral resolution spectroscopic and spectropolarimetric observations constitute a very powerful way of inferring the dynamical, thermodynamical, and magnetic properties of distant objects. However, these techniques…

太阳与恒星天体物理 · 物理学 2015-06-11 A. Asensio Ramos , R. Manso Sainz

Particle-in-Cell (PIC) methods have achieved widespread recognition as simple and flexible approaches to model collisionless plasma physics in fully kinetic simulations of astrophysical environments. However, in many situations the standard…

The sensitivity of gravitational-wave (GW) detectors is characterized by their noise curves, which determine the detector's reach and ability to measure the parameters of astrophysical sources accurately. The detector noise is typically…

天体物理仪器与方法 · 物理学 2025-03-21 Sumit Kumar , Alexander H. Nitz , Xisco Jiménez Forteza

Polynomial chaos expansion (PCE) is a versatile tool widely used in uncertainty quantification and machine learning, but its successful application depends strongly on the accuracy and reliability of the resulting PCE-based response…

统计计算 · 统计学 2023-06-14 Paul-Christian Bürkner , Ilja Kröker , Sergey Oladyshkin , Wolfgang Nowak

Established techniques for characterizing a layer on a substrate system via surface acoustic wave (SAW) dispersion measurement are often slow due to the need for scanning excitation or detection positions. We present a method for…

Using Gaussian integral transform techniques borrowed from functional-integral field theory and the replica trick we derive a version of the coherent-potential approximation (CPA) suited for describing ($i$) the diffusive (hopping) motion…

无序系统与神经网络 · 物理学 2015-06-15 S. Köhler , G. Ruocco , W. Schirmacher

Polynomial chaos expansions (PCE) are well-suited to quantifying uncertainty in models parameterized by independent random variables. The assumption of independence leads to simple strategies for evaluating PCE coefficients. In contrast,…

数值分析 · 数学 2021-05-04 John Jakeman , Fabian Franzelin , Akil Narayan , Michael Eldred , Dirk Plfueger

We present the particle stochastic approximation EM (PSAEM) algorithm for learning of dynamical systems. The method builds on the EM algorithm, an iterative procedure for maximum likelihood inference in latent variable models. By combining…

统计计算 · 统计学 2019-12-11 Andreas Lindholm , Fredrik Lindsten

Electron spin resonance (ESR) pulsed dipolar spectroscopy (PDS) is used effectively in measuring nano-meter range distances for protein structure prediction. The current global approach in extracting the distance distribution from time…

定量方法 · 定量生物学 2021-06-22 Aritro Sinha Roy

We study theoretically the piezoelectric interaction of a surface acoustic wave (SAW) with a two-dimensional electron gas confined to an isolated quantum dot. The electron motion in the dot is diffusive. The electron-electron interaction is…

凝聚态物理 · 物理学 2008-02-03 Andreas Knaebchen , Yehoshua Levinson , Ora Entin-Wohlman

The observing signals from pulsar are always influenced by the interstellar medium (ISM) scattering. In the lower frequency observation, the intensity profiles are broadened and the plane of polarization angle (PPA) curves are flattened by…

太阳与恒星天体物理 · 物理学 2015-06-16 Abdujappar Rusul , Ali Esamdin , Xiao-Ping Zheng , Jian-Ping Yuan

We present a semi-classical analytic model for spherical core-shell surface plasmon lasers. Within this model, we drop the widely used one-mode approximations in favor of fully electromagnetic Mie theory. This allows for incorporation of…

Molecular signals are abundant in engineering and biological contexts, and undergo stochastic propagation in fluid dynamic channels. The received signal is sensitive to a variety of input and channel parameter variations. Currently we do…

计算物理 · 物理学 2019-02-04 Mahmoud Abbaszadeh , Giannis Moutsinas , Peter J. Thomas , Weisi Guo

As a concrete setting where stochastic partial differential equations (SPDEs) are able to model real phenomena, we propose a stochastic Meinhardt model for cell repolarisation and study how parameter estimation techniques developed for…

统计理论 · 数学 2021-08-17 Randolf Altmeyer , Till Bretschneider , Josef Janák , Markus Reiß