Relevant bibliographies by topics / Two-mass model

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Academic literature on the topic 'Two-mass model'

Author: Grafiati
Published: 4 June 2021
Last updated: 16 February 2022

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Journal articles on the topic "Two-mass model"

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Wang, Zhenyu, Ming Li, and Haoyu Wang. "Vehicle Mass Identification Based on Two-axle and Two-mass Vibration Model." IOP Conference Series: Materials Science and Engineering 787 (May 5, 2020): 012024. http://dx.doi.org/10.1088/1757-899x/787/1/012024.

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Juraitis, Sigitas. "MODEL OF TWO-MASS ELECTROMECHANICAL SYSTEM." Mokslas - Lietuvos ateitis 2, no. 1 (February 28, 2010): 85–89. http://dx.doi.org/10.3846/mla.2010.019.

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The computer model of electromechanical system with elasticity and clearance is elaborated. Model of induction motor is developed in stationary reference frame. Results of simulation are presented and discussed. Conclusions about influence of finite stiffness and clearance on the system dynamics are made.
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Wang, Jinfu, and Horst Langemann. "Unsteady two-film model for mass transfer." Chemical Engineering & Technology 17, no. 4 (August 1994): 280–84. http://dx.doi.org/10.1002/ceat.270170410.

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Furukawa, Nobuo, and Masatoshi Imada. "Charge Mass Singularity in Two-Dimensional Hubbard Model." Journal of the Physical Society of Japan 62, no. 8 (August 15, 1993): 2557–60. http://dx.doi.org/10.1143/jpsj.62.2557.

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ISHIKAWA, Satoshi, Shinya KIJIMOTO, Yosuke KOBA, Ryoma OWAKI, and Yuuki MORI. "Two-Dimensional Acoustic Analysis by Concentrated Mass Model." TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 79, no. 801 (2013): 744–48. http://dx.doi.org/10.1299/kikaib.79.744.

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Pelorson, X., A. Hirschberg, and Y. Auregan. "Modified two‐mass model for the vocal cords." Journal of the Acoustical Society of America 93, no. 4 (April 1993): 2417. http://dx.doi.org/10.1121/1.405916.

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Yang, Judy P., and Bo-How Chen. "Two-Mass Vehicle Model for Extracting Bridge Frequencies." International Journal of Structural Stability and Dynamics 18, no. 04 (March 28, 2018): 1850056. http://dx.doi.org/10.1142/s0219455418500566.

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The dynamic response of a moving vehicle has been utilized to extract the frequencies of the supporting bridge. In most previous studies, the vehicle was modeled as a single-degree-of-freedom sprung mass moving over a simple beam, which suffers from the drawback that the sprung mass may be affected by the vehicle motion. To overcome this drawback, this paper presents a two-mass vehicle model for extracting the bridge frequencies, which contains a sprung mass (vehicle body) and an unsprung mass (axle mass). By using the response of the unsprung mass, the bridge response can be more realistically extracted. The main findings of the present study are as follows: (1) the use of unsprung mass in the vehicle model can faithfully reveal the dynamic responses of both the vehicle and bridge, (2) the increase in the unsprung mass can effectively help the extraction of bridge frequencies, including the second frequency, (3) under high levels of road roughness, the proposed model can identify the bridge frequencies, while the single-mass model cannot, and (4) in the presence of vehicle damping, the proposed model can identify the bridge frequencies under high levels of road roughness without additional techniques of processing.
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Khattri, Khim B., and Shiva P. Pudasaini. "An extended quasi two-phase mass flow model." International Journal of Non-Linear Mechanics 106 (November 2018): 205–22. http://dx.doi.org/10.1016/j.ijnonlinmec.2018.07.008.

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Schneider, V., J. Maruhn, and W. Greiner. "Cranking model mass parameters for the Asymmetrie Two Center Shell Model." Zeitschrift f�r Physik A Atomic Nuclei 323, no. 1 (March 1986): 111–18. http://dx.doi.org/10.1007/bf01294562.

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Yao, Sen, Ya-Ling He, Bing-Ye Song, and Xiao-Yue Li. "A two-dimensional, two-phase mass transport model for microbial fuel cells." Electrochimica Acta 212 (September 2016): 201–11. http://dx.doi.org/10.1016/j.electacta.2016.06.167.

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Dissertations / Theses on the topic "Two-mass model"

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Burns, Michael E. "Model-independent mass and spin determination for a sequential decay with a jet and two leptons." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0024843.

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Mottet, Laetitia. "Simulations of heat and mass transfer within the capillary evaporator of a two-phase loop." Thesis, Toulouse, INPT, 2016. http://www.theses.fr/2016INPT0012/document.

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Le contrôle thermique des composants électroniques embarqués dans les engins spatiaux est souvent assuré par des boucles fluides diphasiques à pompage capillaire (Loop Heat Pipe (LHP) ou Capillary Pumped Loop (CPL)). La présente étude est centrée sur les évaporateurs des LHP. Ils sont composés principalement d’un bâti métallique, d’une mèche poreuse et de cannelures. Le milieu poreux est initialement saturé en liquide. La charge thermique à évacuer est appliquée sur le bâti entraînant la vaporisation du liquide au sein de la mèche. La vapeur est ensuite récoltée au sein des cannelures pour être évacuée. L’étude est effectuée sur une cellule unitaire de l’évaporateur. Dans le but d’étudier les transferts de masse et de chaleur, un modèle de réseau de pores 3D dit mixte a été développé. Les champs de pression et de température sont calculés à partir des équations macroscopiques tandis que la capillarité est gérée à l’aide d’une approche réseau de pore classique. L’un des avantages d’une telle formulation est de pouvoir accéder à la répartition des phases liquide et vapeur au sein de l’espace poral du milieu poreux. Il a ainsi été mis en évidence qu’une zone diphasique (zone où le liquide et la vapeur coexistent) se met en place pour une large gamme de flux lorsque la vapeur apparait dans la structure capillaire. Cette zone diphasique est localisée sous le bâti métallique et est corrélée avec les meilleures performances thermiques de l’évaporateur. Cette observation diffère fortement de l’hypothèse souvent considérée de la présence d’une zone sèche dans cette région. Trois positions différentes de cannelures ont été étudiées. Il a ainsi pu être mis en évidence que la plus large gamme de flux, pour laquelle les performances de l’évaporateur sont les meilleures, est obtenue lorsque les cannelures sont usinées à la surface extérieure de la mèche. Toujours dans le but d’améliorer les performances thermiques de l’évaporateur, une étude paramétrique a été menée pour mettre en évidence les paramètres qui influencent positivement la conductance de l’évaporateur. Finalement, l’étude de l’influence d’une mèche biporeuse/bidispersée, c’est-à-dire d’un milieu poreux caractérisé par deux tailles de pores/liens différentes, a été menée. La distribution des phases liquide et vapeur au sein de la structure capillaire bidispersée est différente de celle d’un milieu mono-poreux du fait des chemins préférentiels créés par les larges pores. Par ailleurs, l’analyse thermique a montré qu’un tel milieu poreux permet de réduire considérablement la température du bâti ainsi que d’augmenter les performances thermiques de l’évaporateur. Un deuxième modèle basé sur une approche continue a été développé. Cette méthode utilise l’algorithme IMPES (IMplicit Pressure Explicit Saturation) et est couplé à la résolution du champ de température avec changement de phase. Ce type de résolution permet d’accéder à un champ de saturation. Les résultats ainsi obtenus sont en bon accord avec ceux prédits par le modèle réseau de pores mixte. Le modèle continu, moins gourmand en temps de calcul, permet d’envisager des simulations sur une plus grande partie de l’évaporateur
The thermal control of electronic devices embedded in spacecraft is often carried out by capillary twophase loop systems (Loop Heat Pipe (LHP) or Capillary Pumped Loop (CPL)). This thesis focuses on the LHP evaporators. They mostly consist of a metallic casing, a porous wick and vapour grooves. The porous medium is initially saturated with liquid. The heat load is applied at the external surface of the casing inducing the vaporisation of the liquid within the wick. The vapour is then evacuated thanks to the vapour grooves. A unit cell of the evaporator is studied and corresponds to our computational domain. A so-called 3D mixed pore network model has been developed in order to study the heat and mass transfers. Pressure and temperature fields are computed from macroscopic equations, while the capillarity is managed using the classical pore network approach. The main advantage of such formulation is to obtain the liquid-vapour phase distribution within the porous medium pore space. The work highlights that a two-phase zone (characterized by the coexistence of the liquid and the vapour) exists for a large range of fluxes when vaporisation takes place within the capillary structure. This twophase zone is located right under the casing and is positively correlated with the best evaporator thermal performances. This result differs from the often made assumption of a dry region under the casing. Three different groove locations are tested. This investigation highlights that evaporator thermal performances are the best over a large range of fluxes for grooves manufactured at the external surface of the wick. In complement, a parametric study is performed to highlight parameters which impact positively the evaporator thermal performances. Finally, a biporous/bidispersed wick, i.e. a wick with a bimodal pore/throat size distribution, is studied. The liquidvapour phase distribution within the capillary structure is different from the one for a monoporous structure due to preferential vapour paths created by the large throats and pores-network. Moreover, the thermal analysis shows that such a porous medium permits to reduce considerably the evaporator wall temperature and to increase the evaporator thermal performances. A second model is developed based on a continuum approach. This method uses the IMPES (IMplicit Pressure Explicit Saturation) algorithm coupled with the heat transfer with phase change. Results are in good agreement with those predicted by the mixed pore network model. The continuum model, requiring less computing time, should allow considering larger sub domains of the evaporator
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Beranek, Sarah [Verfasser], Stefan [Akademischer Betreuer] Schael, and Thomas [Akademischer Betreuer] Hebbeker. "Model independent search for new particles in two-dimensional mass space using events with missing energy, two jets and two leptons with the CMS detector / Sarah Beranek ; Stefan Schael, Thomas Hebbeker." Aachen : Universitätsbibliothek der RWTH Aachen, 2017. http://d-nb.info/116141200X/34.

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Skoglund, Emil. "A NUMERICAL MODEL OF HEAT- AND MASS TRANSFER IN POLYMER ELECTROLYTE FUEL CELLS : A two-dimensional 1+1D approach to solve the steady-state temperature- and mass- distributions." Thesis, Mälardalens högskola, Framtidens energi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-55223.

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Methods of solving the steady state characteristics of a node matrix equation system over a polymer electrolyte fuel cell (PEFC) were evaluated. The most suitable method, referred to as the semi-implicit method, was set up in a MATLAB program. The model covers heat transfer due to thermal diffusion throughout the layers and due to thermal advection+diffusion in the gas channels. Included mass transport processes cover only transport of water vapor and consist of the same diffusion/advection schematics as the heat transfer processes. The mass transport processes are hence Fickian diffusion throughout all the layers and diffusion+advection in the gas channels. Data regarding all the relevant properties of the layer materials were gathered to simulate these heat- and mass transfer processes.Comparing the simulated temperature profiles obtained with the model to the temperature profiles of a previous work’s model, showed that the characteristics and behavior of the temperature profile are realistic. There were however differences between the results, but due to the number of unknown parameters in the previous work’s model it was not possible to draw conclusions regarding the accuracy of the model by comparing the results.Comparing the simulated water concentration profiles of the model and measured values, showed that the model produced concentration characteristics that for the most part alignedwell with the measurement data. The part of the fuel cell where the concentration profile did not match the measured data was the cathode side gas diffusion layer (GDL). This comparison was however performed with the assumption that relative humidity corresponds to liquid water concentration, and that this liquid water concentration is in the same range as the measured data. Because of this assumption it was not possible to determine the accuracy of the model.
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Smith, Austin. "Agreement Level of Running Temporal Measurements, Kinetics, and Force-Time Curves Calculated from Inertial Measurement Units." Digital Commons @ East Tennessee State University, 2021. https://dc.etsu.edu/etd/3861.

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Inertial measurement units (IMUs) and wearable sensors have enabled athlete monitoring and research to become more ecologically valid due to their small size and low cost. IMUs and accelerometers that are placed on the body close to the point of impact and that record at sufficiently high frequencies have demonstrated the highest validity when measuring temporal gait event moments such as ground contact time (GCT) and flight time (FT) as well as peak forces (PF) during upright running. While the use of IMUs has increased in the sport performance and athlete monitoring realm, the potential of the technology’s ability to estimate running force-time curves utilizing the two-mass model (TMM) remains unexplored. The purpose of this study was two-fold. First, was to determine the validity of measuring temporal gait events and peak forces utilizing a commercially available shank-mounted inertial measurement unit. Second, was to determine the validity of force-time curves generated from the TMM utilizing data from shank-mounted inertial measurement units. Ten subjects voluntarily completed submaximal treadmill tests equipped with a force plate while wearing shank-mounted IMUs on each leg. Using the raw data from the IMUs, GCT, FT, total step time (ST), PF, and two-mass model-based force-time (F-t) curves were generated for 25 steps at 8 different speeds. Paired sample T-tests were performed on the gait events and peak force between the IMU and treadmill with both individual step comparison and averages per each speed. 95% confidence intervals were calculated for each timepoint of the force time curves. No statistically significant differences (p > 0.05) and nearly perfect relationships were observed for the step averages for each speed with FT, ST, and PF. Confidence intervals of the corrected mean difference suggest that F-t curves calculated from the TMM may not be valid when assessing the running population as a whole. When performing a sub-group analysis of skilled runners and recreational runners, F-t curves derived from shank-mounted IMUs may be more valid in skilled runners than recreational runners. In skilled runners, the 95% CI for the mean difference contained zero within the first 60% of the GCT duration, whereas the 95% CI recreational runners contained a zero-value in a smaller percentage of the GCT located only in the middle of the GCT at the curve peak height. The results of this study suggest that interchangeability between shank-mounted IMUs and force plates may be very limited when estimating temporal gait events and kinetics. While agreement was low between F-t curves after the peak in skilled runners, use of shank-mounted IMUs to estimate F-t curves may have several benefits still in skilled runners when assessing peak forces and force development from initial contact until peak force.
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Song, Yang. "Unstructured Nodal Discontinuous Galerkin Method for Convection-Diffusion Equations Applied to Neutral Fluids and Plasmas." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/99291.

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In recent years, the discontinuous Galerkin (DG) method has been successfully applied to solving hyperbolic conservation laws. Due to its compactness, high order accuracy, and versatility, the DG method has been extensively applied to convection-diffusion problems. In this dissertation, a numerical package, texttt{PHORCE}, is introduced to solve a number of convection-diffusion problems in neutral fluids and plasmas. Unstructured grids are used in order to randomize grid errors, which is especially important for complex geometries. texttt{PHORCE} is written in texttt{C++} and fully parallelized using the texttt{MPI} library. Memory optimization has been considered in this work to achieve improved efficiency. DG algorithms for hyperbolic terms are well studied. However, an accurate and efficient diffusion solver still constitutes ongoing research, especially for a nodal representation of the discontinuous Galerkin (NDG) method. An affine reconstructed discontinuous Galerkin (aRDG) algorithm is developed in this work to solve the diffusive operator using an unstructured NDG method. Unlike other reconstructed/recovery algorithms, all computations can be performed on a reference domain, which promotes efficiency in computation and storage. In addition, to the best of the authors' knowledge, this is the first practical guideline that has been proposed for applying the reconstruction algorithm on a nodal discontinuous Galerkin method. TVB type and WENO type limiters are also studied to deal with numerical oscillations in regions with strong physical gradients in state variables. A high-order positivity-preserving limiter is also extended in this work to prevent negative densities and pressure. A new interface tracking method, mass of fluid (MOF), along with its bound limiter has been proposed in this work to compute the mass fractions of different fluids over time. Hydrodynamic models, such as Euler and Navier-Stokes equations, and plasma models, such as ideal-magnetohydrodynamics (MHD) and two-fluid plasma equations, are studied and benchmarked with various applications using this DG framework. Numerical computations of Rayleigh-Taylor instability growth with experimentally relevant parameters are performed using hydrodynamic and MHD models on planar and radially converging domains. Discussions of the suppression mechanisms of Rayleigh-Taylor instabilities due to magnetic fields, viscosity, resistivity, and thermal conductivity are also included. This work was partially supported by the US Department of Energy under grant number DE-SC0016515. The author acknowledges Advanced Research Computing at Virginia Tech for providing computational resources and technical support that have contributed to the results reported within this work. URL: http://www.arc.vt.edu
Doctor of Philosophy
High-energy density (HED) plasma science is an important area in studying astrophysical phenomena as well as laboratory phenomena such as those applicable to inertial confinement fusion (ICF). ICF plasmas undergo radial compression, with an aim of achieving fusion ignition, and are subject to a number of hydrodynamic instabilities that can significantly alter the implosion and prevent sufficient fusion reactions. An understanding of these instabilities and their mitigation mechanisms is important allow for a stable implosion in ICF experiments. This work aims to provide a high order accurate and robust numerical framework that can be used to study these instabilities through simulations. The first half of this work aims to provide a detailed description of the numerical framework, texttt{PHORCE}. texttt{PHORCE} is a high order numerical package that can be used in solving convection-diffusion problems in neutral fluids and plasmas. Outstanding challenges exist in simulating high energy density (HED) hydrodynamics, where very large gradients exist in density, temperature, and transport coefficients (such as viscosity), and numerical instabilities arise from these region if there is no intervention. These instabilities may lead to inaccurate results or cause simulations to fail, especially for high-order numerical methods. Substantial work has been done in texttt{PHORCE} to improve its robustness in dealing with numerical instabilities. This includes the implementation and design of several high-order limiters. An novel algorithm is also proposed in this work to solve the diffusion term accurately and efficiently, which further enriches the physics that texttt{PHORCE} can investigate. The second half of this work involves rigorous benchmarks and experimentally relevant simulations of hydrodynamic instabilities. Both advection and diffusion solvers are well verified through convergence studies. Hydrodynamic and plasma models implemented are also validated against results in existing literature. Rayleigh-Taylor instability growth with experimentally relevant parameters are performed on both planar and radially converging domains. Although this work is motivated by physics in HED hydrodynamics, the emphasis is placed on numerical models that are generally applicable across a wide variety of fields and disciplines.
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Teuber, Katharina [Verfasser], Reinhard [Akademischer Betreuer] Hinkelmann, Reinhard [Gutachter] Hinkelmann, Gunnar [Gutachter] Nützmann, Dirk [Gutachter] Muschalla, and Jann [Gutachter] Strybny. "A three-dimensional two-phase model for flow, transport and mass transfer processes in sewers / Katharina Teuber ; Gutachter: Reinhard Hinkelmann, Gunnar Nützmann, Dirk Muschalla, Jann Strybny ; Betreuer: Reinhard Hinkelmann." Berlin : Technische Universität Berlin, 2020. http://d-nb.info/1204478066/34.

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Zaccarelli, Riccardo. "Mathematical modelling of sound production in birds." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2009. http://dx.doi.org/10.18452/16507.

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In dieser Arbeit wird die Physik der Stimm- und Lautbildung von Vögeln untersucht, wobei zwei verschiedene Zwei-Massen-Modelle des menschlichen Kehlkopfes, sowie die Theorie der Nichtlinearen Dynamik verwendet werden. Die Zwei-Massen-Modelle des menschlichen Kehlkopfes (ein angepasstes Zwei-Massen-Modell und ein Trapez-Modell) wurden dazu an die Größe des Stimmorgans der Vögel (Syrinx) angepasst, um die Druckentstehung, die Steuerung der harmonischen Obertöne und "Register" studieren zu können, die vom Syrinx ohne Kopplung an Quelle und Vokaltrakt erzeugt werden. Unsere Simulationen sind ein erster Schritt in Richtung eines realistischeren Modells der Syrinx. Eine detaillierte Bifurkationsanalyse des Trapezmodells bestätigt, dass die Geometrie und die Ruhelage der Syrinx das harmonische Spektrum drastisch beeinflussen können, und sie gibt Hinweise über mögliche Erzeugungsmechanismen der reichhaltigen harmonischen Spektren während der Einatmung. Des weiteren wird die Bifurkationsanalyse benutzt, um den Beitrag der Muskeln der Syrinx quantitativ zu beschreiben. Dies geschieht in dem Modell mit Hilfe von zeitabhängigen Parametern, welche die Ruhelage der Labia und die Frequenzmodulation steuern.
In this thesis, the physics of birds phonation is discussed using a two-mass models approach and the theory of nonlinear dynamics. Two-mass models of the human larynx (rescaled two-mass model and trapezoidal model) have been adapted to the dimension of the avian syrinx to study pressure onset, control of harmonic overtones and "registers" of the sound radiated by the birds vocal organ (syrinx) in the absence of source-tract coupling. Our simulations are a first step towards more realistic modelling of the syrinx. A detailed bifurcation analysis of the trapezoidal model confirms that the geometry and the rest position of the syrinx can influence the harmonic spectra drastically, suggests possible mechanisms involved in the production of rich-harmonic spectra during inspiration and is used to describe quantitatively the contribution of syringeal muscles. The latter is implemented in the model by means of driving time-dependent parameters controlling the labia rest position and frequency modulation.
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Maestre, Marina Rodrigues. "Análise de modelos lineares mistos com um fator longitudinal quantitativo e um qualitativo ordinal." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/11/11134/tde-06102014-085644/.

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Os experimentos agronômicos que envolvem somente um fator longitudinal são bastante comuns. No entanto, existem casos em que as observações são tomadas considerando dois ou mais desses fatores, como nos casos em que são feitas medidas de uma variável resposta em profundidades diferentes ao longo do tempo, por exemplo. Admite-se que essas observações, tomadas de modo sistemático em cada unidade experimental, sejam correlacionadas e as variâncias nos diferentes níveis do fator longitudinal sejam heterogêneas. Com o uso de modelos mistos, essa correlação entre medidas repetidas e a heterogeneidade de variâncias podem ser modeladas convenientemente. Para que esses modelos sejam ajustados a um conjunto de dados envolvendo presença de dois fatores longitudinais, existe a necessidade de se adaptarem algumas estruturas de variâncias e covariâncias que são comuns em experimentos com somente um fator longitudinal. O objetivo do presente trabalho é utilizar a classe dos modelos lineares mistos para estudar a massa seca de raiz no solo de uma plantação de cana-de-açúcar. O experimento foi casualizado em blocos e as parcelas receberam quatro doses de nitrogênio. Foram feitas medidas repetidas ao longo de dois fatores longitudinais, sendo um qualitativo ordinal (profundidades) e um quantitativo (distâncias da linha de plantio). Por meio dos testes de razão de verossimilhanças, de Wald e utilizando os critérios de informação AIC e BIC, selecionou-se uma estrutura de covariâncias parcimoniosa e outra estrutura para explicar o comportamento médio das respostas. A verificação do ajuste foi feita por meio de gráficos de diagnósticos de resíduos.
Agronomic experiments involving only one longitudinal factor are quite common. However, there are cases that the observations are made by considering two or more of these factors such as where measurements are made in a response variable at different depths along the time, for example. It is admitted that these observations, taken in a systematic way in each experimental unit are correlated and variances are heterogeneous in different levels of longitudinal factor. Using mixed models, this correlation between repeated measures and heterogeneity of variances can be modeled conveniently. To fit these models to data set involving presence of two longitudinal factors, there is need to adapt some variance and covariance structures that are common in experiments with only one longitudinal factor. The objective of this work is to use the class of linear mixed models to study the dry root mass in the soil of a plantation of cane sugar. The experiment was the randomized complete blocks design and parcels received four doses of nitrogen. Repeated measurements were made along two longitudinal factors being one ordinal qualitative (depths) and one quantitative (distances from the row). With the aid of likelihood ratio, Wald tests and using the AIC and BIC information criteria, we selected a parsimonious covariance structure and another structure to explain the average behavior of the responses. Checking the fit was made using diagnostic graphics of residuals.
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Esrael, Daoud. "Dépollution des sols par l'extraction multiphasique : Développement d'un modèle numérique." Thesis, Lyon, INSA, 2015. http://www.theses.fr/2015ISAL0134.

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Aujourd’hui, plus de 65% des sites pollués en France le sont par des COVs (BASOL), considérés comme étant très dangereux et toxiques pour l’homme et l’environnement. Cela nécessite d’utiliser des techniques de traitement pour restaurer les sites et limiter les risques de propagation vers les eaux souterraines. L’extraction multiphasique MPE est une méthode physique de traitement des COVs. Elle a plusieurs avantages : essentiellement économique, le fait de pouvoir être utilisée in-situ et le fait de permettre la remédiation simultanée de deux zones saturée et non saturée du sous-sol. L’objectif de cette thèse est d’étudier cette technique en développant un modèle mathématique qui permet de décrire l’écoulement multiphasiques des différentes phases, le transport et le transfert de masse entre ces phases. Deux sols sableux et un polluant modèles sont choisis et caractérisés. Des dispositifs expérimentaux sont utilisés pour l’étude de l’écoulement diphasique et multiphasique ainsi que l’étude de transfert de masse. Un modèle numérique est développé, il se compose de trois EDPs pour l’écoulement (gazeuse, aqueuse et PLNA) et quatre EDPs pour le transport/transfert de masse pour chaque composé. La validation du modèle MPE est réalisée par la vérification de différentes parties qui le constituent séparément. La partie de l’écoulement diphasique est vérifiée à travers les résultats d’expérience de drainage sur colonne 1D et sur des résultats issus de la littérature d’une cellule type Hele-show 2D. L’importance du choix des conditions aux limites est mise en évidence. La partie de l’écoulement triphasique est vérifiée à travers les résultats d’expériences d’infiltration sur cellule 2D, l’une réalisée au laboratoire et l’autre issue de la littérature. L’étude porte sur l’effet du choix des dimensions d’expériences de laboratoire sur l’extrapolation des résultats à l’échelle du terrain. La partie transport/transfert de polluant est vérifiée à travers des expériences d’extraction sous vide/Venting. Le coefficient de transfert est déterminé avec une meilleure précision que celle des modèles issus de la littérature. Enfin une simulation à l’échelle de terrain est effectuée avec le modèle MPE pour simuler la dépollution d’un site pollué selon un scénario supposé et développé par la MPE. Les limites de la méthode pour la dépollution de la frange capillaire sont mises en évidence
Today, over 65% of polluted sites in France are by VOCs (BASOL), considered to be very dangerous and toxic to humans and the environment. This requires using treatment techniques to restore the sites and limit the risk of spread to groundwater. The multiphase extraction MPE is a physical method of soil VOCs treatment. It has several advantages: essentially economic, being able to be used in site and permitting the simultaneous remediation of both saturated and unsaturated zones. The objective of this thesis is to study this technique by developing a mathematical model to describe the multiphase flow of different phases, transport and mass transfer between these phases. Two sandy soils and a pollutant models are selected and characterized. Experimental devices are used to study the two-phase, multiphase flow and mass transfer. A numerical model is developed; it consists of three PDEs for the flow (gas, water and NAPL) and four PDEs to pollution transport/mass transfer for each compound. MPE Model validation is performed by the verification of different constituent parts separately. The two-phase flow is confirmed by the drainage experiment results of 1D column and of the results of the literature of a 2D Hele-show tank. The importance of the choice of boundary conditions is highlighted. The part of the three-phase flow is verified through the results of infiltration experiments on 2D tank, one conducted in the laboratory and the other of the literature. The study focuses on the effect of the choice of laboratory experiments dimensions on the extrapolation of results across the field. The transport/mass transfer part is verified by SVE/Venting experiments. The transfer coefficient is determined with a precision better than models from the literature. Finally a simulation at the field scale is carried out with the MPE model to simulate the remediation of polluted sites by MPE for a supposed scenario. The limitations of the method for remedying the capillary fringe are highlighted
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Books on the topic "Two-mass model"

1

Kalinowska, Monika B. Numerical solutions of two-dimensional mass transport equation in flowing surface waters. Warszawa: Institute of Geophysics, Polish Academy of Sciences, 2008.

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Nasser, Munir K. Egyptian mass media under Nasser and Sadat: Two models of press management and control. Columbia, S.C: Association for Education in Journalism and Mass Communication, 1990.

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Nasser, Munir K. Egyptian mass media under Nasser and Sadat: Two models of press management and control. Columbia, S.C: Association for Education in Journalism and Mass Communication, 1990.

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Nasser, Munir K. Egyptian mass media under Nasser and Sadat: Two models of press management and control. Columbia, SC: Association for Education in Journalism and Mass Communication, 1990.

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Gilson, Thomas L. A computer model of two component mass transfer from single rising gas bubbles in water. 1985.

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Kenski, Kate, and Kathleen Hall Jamieson. Political Communication. Edited by Kate Kenski and Kathleen Hall Jamieson. Oxford University Press, 2016. http://dx.doi.org/10.1093/oxfordhb/9780199793471.013.86.

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Two recent changes in the political arena should prompt a rethinking of our theories and definitions of political communication: the emergence of trans-national and non-national actors on the international political stage and the enhanced ability of individuals to convey messages to large scale audiences. For example, the entity called IS, ISIL or ISIS has demonstrated that it can set the agendas of both legacy media and elected leaders with evocative messaging that reaches a mass public while at the same time bypassing traditional media gatekeepers. This chapter argues that our theories about the altered relationships among leaders, media, and publics should forsake key assumptions in the “transmission” model, are amendable to a focus on message, and reconsider concepts such as the two-step flow. This changed environment requires as well that a definition of political communication include a concept of power not predicated on top-down models of understanding.
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Cook, PG, and AL Herczeg. Groundwater Chemical Methods for Recharge Studies - Part 2. CSIRO Publishing, 1998. http://dx.doi.org/10.1071/9780643105348.

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These notes are restricted to those geochemical methods which have been used to quantify rates of groundwater recharge. There have been two main approaches. The first involves the use of mass balances and mixing cell models, mainly using conservative (non-reacting) dissolved species. The methods range in complexity from simple back-of-the-envelope calculations (zero-dimensional chloride mass balance), to complex three-dimensional computer models. The second approach seeks to estimate the age or residence time of the groundwater by measuring compounds which are radioactive, or whose input to the aquifer has been changing over time (chlorofluorocarbons). In this report, the methodology and case examples are described. References to further information on the techniques are also provided.
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S, El-Genk Mohamed, and United States. National Aeronautics and Space Administration., eds. "HPTAM", a two-dimensional heat pipe transient analysis model, including the startup from a frozen state: Final report no. UNM-ISNPS-4-1995. Albuquerque, N.M: Institute for Space and Nuclear Power Studies, School of Engineering, University of New Mexico, 1995.

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"HPTAM", a two-dimensional heat pipe transient analysis model, including the startup from a frozen state: Final report no. UNM-ISNPS-4-1995. Albuquerque, N.M: Institute for Space and Nuclear Power Studies, School of Engineering, University of New Mexico, 1995.

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"HPTAM", a two-dimensional heat pipe transient analysis model, including the startup from a frozen state: Final report no. UNM-ISNPS-4-1995. Albuquerque, N.M: Institute for Space and Nuclear Power Studies, School of Engineering, University of New Mexico, 1995.

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Book chapters on the topic "Two-mass model"

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Zeng, Yijian. "Two-Phase Mass and Heat Flow Model." In Springer Theses, 61–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-34073-4_4.

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Platovskikh, Mikhail J. "Dynamic Model of the Two-Mass Active Vibroprotective System." In Advances in Mechanical Engineering, 85–92. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-15684-2_11.

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Yang, Judy P., and Cheng-Yi Cao. "Scanning Bridge Frequencies by Wheel Size Embedded Two-Mass Vehicle Model." In Advanced Structured Materials, 257–63. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-79325-8_22.

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Barsky, Eugene. "Structural Model of Mass Transfer in Critical Regimes of Two-Phase Flows." In Critical Regimes of Two-Phase Flows with a Polydisperse Solid Phase, 125–52. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-8838-3_7.

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Verma, Surender, Shankita Bhardwaj, and Monal Kashav. "Majorana Unitarity Triangle in Two-Texture Zero Neutrino Mass Model and Associated Phenomenology." In Springer Proceedings in Physics, 995–1000. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4408-2_144.

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Yao, Xiao, Takatoshi Jitsuhiro, Chiyomi Miyajima, Norihide Kitaoka, and Kazuya Takeda. "An Analysis of the Speech Under Stress Using the Two-Mass Vocal Fold Model." In Proceedings of the Paralinguistic Information and its Integration in Spoken Dialogue Systems Workshop, 57–62. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-1335-6_8.

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Cousins, Ian T., and Donald Mackay. "Multimedia Mass Balance Modelling of Two Phthalate Esters by the Regional Population-Based Model (RPM)." In The Handbook of Environmental Chemistry, 179–200. Berlin, Heidelberg: Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/b11466.

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Wang, Ya, Baoyong Zhao, and Weicun Zhang. "Improved Robust Multiple Model Adaptive Control of the Two-Cart Mass-Spring-Damper System with Uncertainties." In Proceedings of the 2015 Chinese Intelligent Systems Conference, 393–402. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-48386-2_41.

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Peharec Štefanić, Petra, Mario Cindrić, and Biljana Balen. "Proteomic Analysis of Non-model Plant Tissues Using Phenol Extraction, Two-Dimensional Electrophoresis, and MALDI Mass Spectrometry." In Plant Cell Culture Protocols, 351–70. New York, NY: Springer New York, 2018. http://dx.doi.org/10.1007/978-1-4939-8594-4_25.

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Kulik, V. I., A. V. Kulik, M. S. Ramm, A. S. Nilov, and M. V. Bogdanov. "Two-Dimensional Model of Conjugate Heat and Mass Transport in the Isothermal Chemical Vapour Infiltration of 3D-Preform by SiC Matrix." In Materials Science Forum, 245–48. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-963-6.245.

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Conference papers on the topic "Two-mass model"

1

Babu, K. S., and J. Julio. "Renormalization of a two-loop neutrino mass model." In WORKSHOP ON DARK MATTER, NEUTRINO PHYSICS AND ASTROPHYSICS CETUP* 2013: VIIth International Conference on Interconnections between Particle Physics and Cosmology PPC* 2013. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4883422.

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Gaidi, Abderrahmane, Hocine Lehouche, Samir Belkacemi, Souad Tahraoui, Mourad Loucif, and Ouahib Guenounou. "Adaptive Backstepping control of wind turbine two mass model." In 2017 6th International Conference on Systems and Control (ICSC). IEEE, 2017. http://dx.doi.org/10.1109/icosc.2017.7958648.

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Fuentes, Esteban, and Ralph Kennel. "Finite-set model predictive control of the two-mass-system." In 2011 IEEE Workshop on Predictive Control of Electrical Drives and Power Electronics (PRECEDE). IEEE, 2011. http://dx.doi.org/10.1109/precede.2011.6078734.

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Qing Ou, XiaoQi Chen, S. Gutschmidt, A. Wood, and N. Leigh. "A two-mass cantilever beam model for vibration energy harvesting applications." In 2010 IEEE International Conference on Automation Science and Engineering (CASE 2010). IEEE, 2010. http://dx.doi.org/10.1109/coase.2010.5584730.

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Teffahi, Hocine. "A two-mass model of the vocal cords: determination of control parameters." In 2009 International Conference on Multimedia Computing and Systems (ICMCS). IEEE, 2009. http://dx.doi.org/10.1109/mmcs.2009.5256726.

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Julio, J. "Neutrino oscillation parameters in a two–loop neutrino mass model with leptoquarks." In INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES 2016 (ISCPMS 2016): Proceedings of the 2nd International Symposium on Current Progress in Mathematics and Sciences 2016. Author(s), 2017. http://dx.doi.org/10.1063/1.4991109.

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Yao, Xiao, Takatoshi Jitsuhiro, Chiyomi Miyajima, Norihide Kitaoka, and Kazuya Takeda. "Classification of stressed speech using physical parameters derived from two-mass model." In Interspeech 2012. ISCA: ISCA, 2012. http://dx.doi.org/10.21437/interspeech.2012-377.

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Fietzek, Rafael, and Stephan Rinderknecht. "Observer validation and model based control of a two mass oscillator with backlash." In 2013 IEEE International Conference on Mechatronics and Automation (ICMA). IEEE, 2013. http://dx.doi.org/10.1109/icma.2013.6617938.

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Wu, Bo, Annemie Van Hirtum, and Xiaoyu Luo. "Influence of cross section shape on the outcome of a two-mass model." In ICA 2013 Montreal. ASA, 2013. http://dx.doi.org/10.1121/1.4800049.

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Inoue, Gen, Yosuke Matsukuma, and Masaki Minemoto. "Evaluation of Two-Phase Condition and Mass Transfer in GDL With Pore Network Model." In ASME 2009 7th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2009. http://dx.doi.org/10.1115/fuelcell2009-85152.

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In order to improve the output performance of PEFC, it is important to investigate the two-phase condition in gas diffusion layer (GDL). In this study, the simulated GDL structure was developed by numerical analysis including the random orientation of carbon fibers and binders. And detailed structural estimation was carried out. As structural properties, pore size distribution, electrical resistivity and tortuosity were calculated, and these values almost agreed with actual measurement values. Furthermore, our past two-phase network model was improved, and the model based on an actual structure was developed by a direct 3D networking porous structure. And the influence of GDL structure on the two-phase condition with accumulated water was evaluated, and effective diffusion coefficient of oxygen in GDL with liquid water was calculated.
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Reports on the topic "Two-mass model"

1

Laurinat, J. E. Mass transfer model for two-layer TBP oxidation reactions. Office of Scientific and Technical Information (OSTI), September 1994. http://dx.doi.org/10.2172/10108910.

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Laurinat, J. E. Mass transfer model for two-layer TBP oxidation reactions: Revision 1. Office of Scientific and Technical Information (OSTI), November 1994. http://dx.doi.org/10.2172/10105398.

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