Relevant bibliographies by topics / Multiple relaxation times

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers
  5. Reports

Academic literature on the topic 'Multiple relaxation times'

Author: Grafiati
Published: 3 June 2025
Last updated: 31 July 2025

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Journal articles on the topic "Multiple relaxation times"

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Furman, G. B., S. D. Goren, A. M. Panich, and A. I. Shames. "Spin Diffusion in Pure Multiple-Pulse NQR." Zeitschrift für Naturforschung A 55, no. 1-2 (2000): 54–60. http://dx.doi.org/10.1515/zna-2000-1-211.

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We present a detailed theoretical and experimental NQR multiple-pulse spin-locking study of spin-lattice relaxation and spin diffusion processes in the presence of paramagnetic impurities in solids. The obtained diffusion equation was obtained allows to find the time dependence of the magnetization in the effective field. The spin lattice relaxation times were calculated, both for direct and diffusion regimes, as functions of the correlation time and multiple-pulse parameters. Measurements of relaxation times in rotating frame allow to determine the diffusion coefficient and the radius of the
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Rumbach, Lucien, Jean-Paul Armspach, Daniel Gounot, et al. "Nuclear magnetic resonance T2 relaxation times in multiple sclerosis." Journal of the Neurological Sciences 104, no. 2 (1991): 176–81. http://dx.doi.org/10.1016/0022-510x(91)90307-s.

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Dinariev, O. Yu. "Pressure attenuation curve in the relaxation theory of filtration. Case of multiple relaxation times." Journal of Applied Mechanics and Technical Physics 36, no. 2 (1995): 252–57. http://dx.doi.org/10.1007/bf02369657.

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Dellar, Paul J. "Incompressible limits of lattice Boltzmann equations using multiple relaxation times." Journal of Computational Physics 190, no. 2 (2003): 351–70. http://dx.doi.org/10.1016/s0021-9991(03)00279-1.

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PARKS, C., N. S. SULLIVAN, and P. STACHOWIAK. "INVESTIGATION OF MULTIPLE-SPIN EXCHANGE IN 2D FILMS OF 3He: NMR STUDIES." International Journal of Modern Physics B 16, no. 20n22 (2002): 3123–26. http://dx.doi.org/10.1142/s0217979202013717.

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Results of NMR studies of the nuclear spin-spin relaxation times at low temperatures are reported for commensurate monolayers of 3 He physisorbed on hexagonal boron nitride. Temperature independent relaxation rates are observed for 0.11< T <0.56 K, and are interpreted in terms of the quantum exchange motions of the 3 He atoms. The relaxation times and the inferred effective exchange rates were observed to change significantly on replacing the 3 He atoms with relatively immobile Ne atoms. This result is understood in terms of a large 3-spin exchange in addition to 2-spin exchange.
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Farrow, Lutul, John Elias, MEI LI, Mingrui Yang, Carl Winalski та Xiaojuan Li. "Paper 05: Patellar Dislocation in Adolescent Patients: Influence on Patellofemoral and Tibiofemoral Cartilage based on T1ρ Relaxation Times". Orthopaedic Journal of Sports Medicine 11, № 3_suppl2 (2023): 2325967123S0000. http://dx.doi.org/10.1177/2325967123s00005.

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Objectives: Patellar dislocations are associated with a high risk of patellofemoral osteoarthritis (OA). The risk is further elevated for adolescent patients and patients who experience multiple dislocations. Quantitative MRI using T1ρ relaxation time mapping characterizes cartilage properties based on concentration of proteoglycans. Elevated T1ρ values identify cartilage degradation that could develop into post-traumatic OA. The current study compares T1ρ relaxation times throughout the knee between adolescents being treated for a single dislocation, multiple dislocations, and healthy control
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GEERDINK, JOOST B. W., and ALFONS G. HOEKSTRA. "COMPARING ENTROPIC AND MULTIPLE RELAXATION TIMES LATTICE BOLTZMANN METHODS FOR BLOOD FLOW SIMULATIONS." International Journal of Modern Physics C 20, no. 05 (2009): 721–33. http://dx.doi.org/10.1142/s0129183109013947.

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We compare the Lattice BGK, the Multiple Relaxation Times and the Entropic Lattice Boltzmann Methods for time harmonic flows. We measure the stability, speed and accuracy of the three models for Reynolds and Womersley numbers that are representative for human arteries. The Lattice BGK shows predictable stability and is the fastest method in terms of lattice node updates per second. The Multiple Relaxation Times LBM shows erratic stability which depends strongly on the relaxation times set chosen and is slightly slower. The Entropic LBM gives the best stability at the price of fewer lattice nod
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Melis, Ward, and Giovanni Samaey. "Telescopic Projective Integration for Linear Kinetic Equations with Multiple Relaxation Times." Journal of Scientific Computing 76, no. 2 (2018): 697–726. http://dx.doi.org/10.1007/s10915-017-0635-0.

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Dubois, François, Tony Fevrier, and Benjamin Graille. "Lattice Boltzmann Schemes with Relative Velocities." Communications in Computational Physics 17, no. 4 (2015): 1088–112. http://dx.doi.org/10.4208/cicp.2014.m394.

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AbstractIn this contribution, a new class of lattice Boltzmann schemes is introduced and studied. These schemes are presented in a framework that generalizes the multiple relaxation times method of d’Humières. They extend also the Geier’s cascaded method. The relaxation phase takes place in a moving frame involving a set of moments depending on a given relative velocity field. We establish with the Taylor expansion method that the equivalent partial differential equations are identical to the ones obtained with the multiple relaxation times method up to the second order accuracy. The method is
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Kazin, Pavel E., Mikhail A. Zykin, Lev A. Trusov, et al. "Multiple slow relaxation of magnetization in Dy3+ confined in the crystal matrix of rare-earth-calcium silicates with the apatite structure." Dalton Transactions 49, no. 6 (2020): 2014–23. http://dx.doi.org/10.1039/c9dt04248b.

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Dissertations / Theses on the topic "Multiple relaxation times"

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Hernandez, Florent. "Méthodes de résolution exactes pour le problème de routage de véhicules avec fenêtres de temps et routes multiples." Thesis, Montpellier 2, 2010. http://www.theses.fr/2010MON20215.

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Le problème de routage de véhicules avec fenêtres de temps et routes multiples (MTVRPTW) est une généralisation du problème de routage de véhicules avec fenêtres de temps (VRPTW). Dans le MTVRPTW, on autorise un véhicule à effectuer plusieurs routes durant une période de planification, ce qui permet d'optimiser les transports lorsque le nombre de véhicules est limité et peu élevé. Nous proposons dans cette thèse la première méthode exacte permettant de résoudre ce problème. Notre modélisation prend la forme d'un problème de couverture des clients dont les variables sont des routes. Des contrai
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Huang, Bo-Yao, and 黃柏堯. "A Three-Dimensional Semiclassical Lattice Boltzmann Method Using Multiple Relaxation Times For Quantum Hydrodynamic Flow Simulations." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/82252957605659343556.

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碩士<br>國立臺灣大學<br>應用力學研究所<br>101<br>According to two dimensional multiple-relaxation-time semiclassical lattice Boltzmann method, a three dimensional multiple-relaxation-time semiclassical lattice Boltzmann based on the Uehling-Uhlenbeck Boltzmann-BGK equation has been successfully developed by using D3Q19 lattice model. The method is derived by expanding the equilibrium distribution function in term of Hermite polynomials. Then, we combine the concept of multiple-relaxation-time with lattice Boltzmann method to obtain the moment matrix and various physical quantities. Simulations with SRT and M
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Chang, Li-Jen, and 張力仁. "Semiclassical Multiple Relaxation Time Lattice Boltzmann-Ellipsoidal Statistical Method for Flow Simulation." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/64256266209196284800.

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碩士<br>國立臺灣大學<br>應用力學研究所<br>102<br>A Semiclassical Multiple Relaxation Time Lattice Boltzmann Ellipsoidal Statistical Method based on the Uehling-Uhlenbeck Boltzmann-BGK equation, Ellipsoidal Statistical BGK equation (ES-BGK) and Multiple Relaxation Time Lattice Boltzmann Method (MRT-LBM) is presented. The method is derived by expanding the Semiclassical equilibrium distribution function for Ellipsoidal Statistical method in term of Hermite polynomials, and the relationship between relaxation time and viscosity can be obtained by using Chapman-Enskog expansion. Simulations of the lid driven cav
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Lin, Li-Song, and 林立松. "Predictions of flow instability in deep lid driven cavity flows using multiple relaxation time lattice Boltzmann method." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/45564528596322131040.

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博士<br>國立清華大學<br>動力機械工程學系<br>103<br>The present study employs the multi relaxation time (MRT) lattice Boltzmann equation (LBE) to study the flow instability within lid driven cavity at different depth-width aspect ratios. The focuses are to examine the correlation between the depth-width aspect ratio and the transition Reynolds number, and to identify the oscillatory instability mechanism. Simulations were applied to two and three dimensional cavity flows at different depth aspect rations. For square and cubic cavity flows, the predicted results were validated with available benchmark solutions
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Huang, Xiao-Ying, and 黃孝穎. "Simulations of turbulent flow over periodic hills with multiple-relaxation-time Lattice Boltzmann method on multi-GPU cluster." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/354d9d.

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Liu, Shih-Huang, and 劉士煌. "Analysis of Turbulent Flow in Square Duct by using Multiple-Relaxation Time Lattice Boltzmann Method and Large Eddy Simulation." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/87338585389336215008.

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AMARU', Fabio. "Multimodal techniques for biomedical image processing." Doctoral thesis, 2014. http://hdl.handle.net/11562/693559.

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Il lavoro di dottorato ha coinvolto tre principali aree di ricerca biomedica. Nella prima area, abbiamo mirato a valutare se le misure del tempo di rilassamento T1 in Risonanza Magnetica possono contribuire ad individuare dei predittori strutturali di lievi disturbi cognitivi in pazienti con forma Recidivante-Remittente di Sclerosi Multipla(RRMS). Ventinove controlli sani (HC) e quarantanove RRMS pazienti sono stati sottoposti a Risonanza magnetica a 3T per acquisire in maniera ottimale per la zona corticale e per la sostanza bianca (WML), i tempi di rilassamento T1 (rt), la conta delle lesion
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Book chapters on the topic "Multiple relaxation times"

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Li, Jingfa, Bo Yu, Shuyu Sun, and Dongliang Sun. "Study on an N-Parallel FENE-P Constitutive Model Based on Multiple Relaxation Times for Viscoelastic Fluid." In Lecture Notes in Computer Science. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-93713-7_57.

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Li, Jingfa, Bo Yu, Xinyu Zhang, Shuyu Sun, Dongliang Sun, and Tao Zhang. "LES Study on High Reynolds Turbulent Drag-Reducing Flow of Viscoelastic Fluids Based on Multiple Relaxation Times Constitutive Model and Mixed Subgrid-Scale Model." In Lecture Notes in Computer Science. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-93713-7_14.

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Berne, B. J. "Multiple Time Scales in Molecular Dynamics: Applications to Vibrational Relaxation." In Reaction Dynamics in Clusters and Condensed Phases. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0786-0_32.

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Monaco, Ernesto, Kai H. Luo, and Gunther Brenner. "Multiple Relaxation Time Lattice Boltzmann simulation of binary droplet collisions." In Lecture Notes in Computational Science and Engineering. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-14438-7_27.

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Parry, A. M., S. Clare, and P. M. Matthews. "Rapid, Whole-Brain T1 Relaxation Time Measurements for the Quantitative Definition of Pathological Changes in Multiple Sclerosis." In Normal-appearing White and Grey Matter Damage in Multiple Sclerosis. Springer Milan, 2004. http://dx.doi.org/10.1007/978-88-470-2127-3_6.

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Schmieschek, Sebastian, Ariel Narváez, and Jens Harting. "Multi Relaxation Time Lattice Boltzmann Simulations of Multiple Component Fluid Flows in Porous Media." In High Performance Computing in Science and Engineering ‘12. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33374-3_5.

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Filahi, I., M. Hasnaoui, A. Amahmid, A. El Mansouri, M. Alouah, and Y. Dahani. "Numerical Simulation of Direct Carbon Fuel Cell Using Multiple-Relaxation-Time Lattice Boltzmann Method." In Lecture Notes in Electrical Engineering. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6259-4_27.

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Boraey, Mohammed A. "Frequency Scaling in a Sweeping-Jet Fluidic Oscillator Working at Low Reynolds Numbers: A Multiple-Relaxation Time LBM Model." In Recent Advances in Engineering Mathematics and Physics. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-39847-7_26.

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Admi, Youssef, Abdelilah Makaoui, El Bachir Lahmer, Mohammed Amine Moussaoui, and Ahmed Mezrhab. "Numerical Study of the Drag Reduction and Forced Convection Around Rectangular Block by Using the LBM Method." In Advances in Environmental Engineering and Green Technologies. IGI Global, 2025. https://doi.org/10.4018/979-8-3693-9924-8.ch018.

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This research aims to study flow control for reducing aerodynamic drag and cooling a rectangular electronic component using an inclined partition. Unlike existing studies focusing on horizontal or vertical plates, this work numerically investigates the impact of an inclined partition on flow and temperature fields using the lattice Boltzmann method with multiple relaxation times. Results show that increasing the Reynolds number enhances heat exchange and reduces the drag coefficient, with a maximum Cd reduction of 125.41% at Re = 250. Additionally, at Re = 150, positioning the partition at g =
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Tiwari, Sandip. "Scattering-constrained dynamics." In Semiconductor Physics. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198759867.003.0009.

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This chapter discusses the statics and dynamics of particle ensemble evolution under multiple stimuli—electrical, magnetic and thermal, particularly (thermoelectromagnetic interaction)—by developing the evolution of the distribution function in a generalized form from its thermal equilibrium form. In the presence of electrical and magnetic fields, this shows the Hall effect, magnetoresistance, et cetera. Add thermal gradients, and one can elaborate additional consequences that can be calculated in terms of momentum relaxation times and the nature of impulse interaction, since momentum and ener
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Conference papers on the topic "Multiple relaxation times"

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K�ksal, Ece S., Erdal Aydin, and Metin T�rkay. "An Efficient Convex Training Algorithm for Artificial Neural Networks by Utilizing Piecewise Linear Approximations and Semi-Continuous Formulations." In The 35th European Symposium on Computer Aided Process Engineering. PSE Press, 2025. https://doi.org/10.69997/sct.125995.

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Artificial neural networks are widely used as data-driven models for capturing complex, nonlinear systems. However, suboptimal training remains a significant challenge due to the nonlinearity of activation functions and the reliance on local solvers, which makes achieving global solutions difficult. One solution involves reformulating activation functions as piecewise linear approximations to convexify the problem, though this approach often requires substantial CPU time. This study demonstrates that a tailored branch-and-bound algorithm can effectively address these challenges by efficiently
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Hurley, Michael F., Arvin Cunningham, Drew Lysne, Sanjeev Acharya, Brian J. Jaques, and Darryl P. Butt. "A Condition Monitor for Atmospheric Induced Stress Corrosion Cracking." In CORROSION 2018. NACE International, 2018. https://doi.org/10.5006/c2018-11634.

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Abstract A sacrificial sensor has been designed to detect the occurrence and rate of atmospheric corrosion and stress corrosion cracking. The sensor fixture was constructed using additive manufacturing and can be customized for use with small size wires or ribbons of any metallic material as a sensor electrode. Resistance change was used to monitor the degradation of arrays of small samples subjected to various stress and environmental conditions. Typical passive atmospheric corrosion sensors do not account for applied stress, or if they do, use statically loaded electrodes and stress relaxati
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Funk, James, Michael Myers, and Lori Hathon. "Correlated Inversion of Complex Dielectric Dispersion and NMR Measurements in Conventional Carbonates." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/210006-ms.

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Abstract Combinations of dielectric and NMR measurements are frequently used to improve saturation modeling in complex situations, often incorporating the concept of wettability. Due to the two methods' distinct tools and physical mechanisms, the interplay of the electrical and magnetic fields and their constitutive equations are generally not addressed. This is directly counter to the situation with the medical imaging modalities, magnetic resonance electrical properties tomography (MREPT) and magnetic resonance electrical impedance tomography (MREIT), where field-specific polarizations and r
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Mishina, Tomobumi, Fumio Sasaki, and Yasuaki Masumoto. "Degenerate Four Wave Mixing in Staggered Type-II AlxGa1-xAs/AlAs Multiple Quantum Well Structures." In International Conference on Ultrafast Phenomena. Optica Publishing Group, 1990. http://dx.doi.org/10.1364/up.1990.thc20.

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Recently much attention has been payed to carrier dynamics in staggered type-II multiple quantum well structures. In this system, photoexcited electrons in well layer Γ state are rapidly scattered into X state in barrier layer. We and several authors have measued these interlayer scattering times with femtosecond pump-and-probe technique using white light continuum1-3). In order to understand the detail of carrier relaxation in staggered type-II multiple quantum well structures, we have explored the degenerate four wave mixing experiment.
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Webb, M. D., S. T. Cundiff, and D. G. Steel. "Stimulated Photon Echoes and Free Polarization Decay in GaAs Multiple Quantum Well Structures: Evidence for Localized and Delocalized Excitons." In International Conference on Ultrafast Phenomena. Optica Publishing Group, 1990. http://dx.doi.org/10.1364/up.1990.me4.

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Recent experimental and theoretical work suggests that excitons in GaAs/AlGaAs multiple quantum wells may be localized by disorder, or delocalized with Bloch-type wavefunctions1. At low temperature, localized excitons are expected to be characterized by spectral diffusion and by long optical coherence times, while delocalized excitons have short coherence times and exhibit spatial mobility2. The short optical coherence time associated with delocalized excitons results in a linear absorption profile that is primarily homogeneously broadened, while the disorder associated with localized excitons
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Kim, J. W., J. H. Kyoung, A. Sablok, and K. Lambrakos. "A Nonlinear Viscoelastic Model for Polyester Mooring Line Analysis." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-50280.

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A viscoelastic model considering multiple relaxation times and nonlinearity in dynamic stiffness has been developed. The model is based on the Maxwell-Wiechert model, which is an extension of an earlier model based on the standard linear solid (SLS) model. The time-dependent elastic modulus of polyester rope is represented by a 4-term Prony series (MW4 model). Relaxation times and coefficients of the Prony series have been determined from test data of dynamic stiffness at different loading periods. Nonlinearity in dynamic stiffness is considered by iteratively adjusting the dynamic stiffness o
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Rezaei, A., M. Salimi Jazi, G. Karami, and M. Ziejewski. "The Effects of Retesting on the Mechanical Properties of Brain Tissue." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-65149.

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Traumatic brain injury (TBI) is one of the most important problems in biomechanical engineering, and there have been many experiments conducted in order to characterize the mechanical properties of brain tissue. However, obtaining fresh human brain tissue is difficult, if not impossible. Also, the sample preparation and testing protocols must be carried out with great delicacy because brain tissue is very soft and vulnerable to being deformed under a very small amount of load. Most importantly, according to several researchers, each sample must be tested only one time as the tissue may be dama
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Snow, P. A., I. E. Day, R. V. Penty, et al. "Low power all-optical switch in a passive InGaAsP multiple quantum well waveguide." In The European Conference on Lasers and Electro-Optics. Optica Publishing Group, 1994. http://dx.doi.org/10.1364/cleo_europe.1994.cfg2.

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In recent years there has been much interest in all-optical switching in nonlinear semi-conductor waveguides, because of their potential for high-speed switching. To date much of the published work on all optical switching at wavelengths around 1.55 μm has concentrated on utilising the nonresonant Kerr nonlinearity in GaAs/AlGaAs structures.1 Whilst these devices exhibit switching times of approximately 100 fs, they require peak optical powers of the order of a hundred watts to operate. This makes them unattractive for telecommunications applications due to the high powers required. We demonst
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Marepalli, Prabhakar, Bo Qiu, Xiulin Ruan, and Jayathi Y. Murthy. "Quantifying Uncertainty in Multiscale Heat Conduction Calculations." In ASME 2012 Heat Transfer Summer Conference collocated with the ASME 2012 Fluids Engineering Division Summer Meeting and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ht2012-58523.

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In recent years, there has been interest in employing atomistic computations to inform macroscale thermal transport analyses. In heat conduction simulations in semiconductors and dielectrics, for example, classical molecular dynamics (MD) is used to compute phonon relaxation times, from which material thermal conductivity may be inferred and used at the macroscale. A drawback of this method is the noise associated with MD simulation, which is generated due to the possibility of multiple initial configurations corresponding to the same system temperature; for phonon relaxation times, the spread
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Harten, P. A., A. Knorr, J. P. Sokoloff, et al. "Observation and theoretical verification of coherent pulse break-up in gallium arsenide quantum well waveguides." In International Conference on Ultrafast Phenomena. Optica Publishing Group, 1992. http://dx.doi.org/10.1364/up.1992.thc26.

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Coherent pulse propagation and pulse break-up in atomic media1 have been extensively studied. The long dephasing time in atomic media facilitates observation of these phenomena using relatively long pulses. However, such coherent processes have not yet been observed in semiconductors where the phase relaxation times are very rapid. Here we report on our experimental and theoretical investigations showing coherent pulse break-up in a semiconductor waveguide with photon energies that are off-resonance with respect to the exciton. The transmitted pulses through a multiple quantum well waveguide e
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Reports on the topic "Multiple relaxation times"

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Carrera-Arce, Maria, Raphael Baumler, Bikram Singh Bhatia, and Lei Du. Shore leave: rare, brief and in danger of extinction. World Maritime University, 2025. https://doi.org/10.21677/250326.

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Shore leave for seafarers is generally accepted as a custom, if not a right, essential for well-being and pressure relief from the responsibilities of life on board. However, it is clear that the ability of seafarers to take shore leave has been seriously eroded and may even be facing extinction. The combination of workload on board and limited time in port make it virtually impossible for seafarers to make time for shore leave. Commercial pressures have increased, and there is a serious risk that facilities available for seafarers will decline due to a lack of demand. The culprits are multipl
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