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Littérature scientifique sur le sujet « Coupling condition »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Coupling condition"

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Guo, Yibin, Wanyou Li, Xiqun Lu, Zhijun Shuai, Donghua Wang, Xiuzhen Ma et Dequan Zou. « Online measurement of torsional stiffness and fault analysis for flexible coupling under working condition ». Proceedings of the Institution of Mechanical Engineers, Part C : Journal of Mechanical Engineering Science 230, no 18 (9 août 2016) : 3175–82. http://dx.doi.org/10.1177/0954406215608408.

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In this paper, a method of measuring the relative torsional angles of the flexible coupling under working condition was developed. A double-encoder measurement system was proposed to get the torsional angles. The torsional angles were divided into “constant torsional angle” and “alternating torsional angle”. The measured results were analyzed further, which were applied to a series of flexible couplings. Firstly, the torsional stiffness of D-type flexible coupling was obtained according to the relationship between torques and torsional angles. The proposed method overcomes the difficulty that the angular displacements of flexible coupling cannot be measured online under operating condition. The feasibility and accuracy of the method developed in this study was verified by comparing stiffness curve with unloading curve obtained from static torsional experiment and values from factory inspection report. Furthermore, in view of the tear fault of A-type flexible coupling in a diesel generator set, the maximum alternating torsional angles of A-type, B-type, and C-type flexible couplings were measured under working condition, then safety margins were obtained for the diesel generator set. According to the safety margins of the three kinds of couplings, C-type flexible coupling is chosen to replace A-type, which provided the basis for type selection of flexible coupling. Finally, the method developed in this study would also be applied to the operation monitoring and fault diagnosis of flexible coupling online.
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Cranston, M., et Feng-Yu Wang. « A condition for the equivalence of coupling and shift coupling ». Annals of Probability 28, no 4 (octobre 2000) : 1666–79. http://dx.doi.org/10.1214/aop/1019160502.

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Kobayashi, Tatsuo, et Noriyasu Ohtsubo. « Yukawa coupling condition of orbifold models ». Physics Letters B 245, no 3-4 (août 1990) : 441–46. http://dx.doi.org/10.1016/0370-2693(90)90671-r.

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O’Reilly, Ossian, et Jan Nordström. « Provably non-stiff implementation of weak coupling conditions for hyperbolic problems ». Numerische Mathematik 150, no 2 (5 janvier 2022) : 551–89. http://dx.doi.org/10.1007/s00211-021-01263-y.

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AbstractIn the context of coupling hyperbolic problems, the maximum stable time step of an explicit numerical scheme may depend on the design of the coupling procedure. If this is the case, the coupling procedure is sensitive to changes in model parameters independent of the Courant–Friedrichs–Levy condition. This sensitivity can cause artificial stiffness that degrades the performance of a numerical scheme. To overcome this problem, we present a systematic and general procedure for weakly imposing coupling conditions via penalty terms in a provably non-stiff manner. The procedure can be used to construct both energy conservative and dissipative couplings, and the user is given control over the amount of dissipation desired. The resulting formulation is simple to implement and dual consistent. The penalty coefficients take the form of projection matrices based on the coupling conditions. Numerical experiments demonstrate that this procedure results in both optimal spectral radii and superconvergent linear functionals.
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Guo, Jianxia. « Calculation accuracy of mathematical homogenization method for thermo-mechanical coupling problems ». Thermal Science 25, no 4 Part B (2021) : 2957–64. http://dx.doi.org/10.2298/tsci2104957g.

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The paper analyzes the thermo-mechanical couplinag phenomenon under the condition of sliding contact, establishes the finite element analysis continuous model of thermo-mechanical coupling, and proposes the system dynamic equilibrium equation and thermodynamic equilibrium equation. The article analyzes the contact conditions between the objects in the system and obtains the objects? contact conditions? mathematical expression. On this basis, the constraint function is used to express the mathematical homogenization. We apply the variation principle to the constraint function and form a non-linear equation group with the system balance equation solve the thermal-mechanical coupling problem. The example shows that we use the constraint function method to solve the thermo-mechanical coupling problem, which has good convergence, stable algorithm, and the calculation result can reflect the actual situation.
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Barzdaitis, Vytautas, Marijonas Bogdevicius et Rimantas Didžiokas. « Dynamic Processes of Rotating System with Coupling ». Solid State Phenomena 113 (juin 2006) : 213–18. http://dx.doi.org/10.4028/www.scientific.net/ssp.113.213.

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The article concerns dynamics and vibration of a high power rotating system with toothed wheel coupling that inserts elastic plate packets. Theoretical modeling and simulation of the rotating system with toothed wheel coupling have been provided by a finite element method. Complex model involved a rotating system, hydrodynamic bearings and coupling. The dynamics of semi-couplings and plates have been simulated. Experimental measurement of vibration has been measured with stationary machine condition monitoring and a diagnostic system.
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Yi, KangHyun. « Output Voltage Analysis of Inductive Wireless Power Ttransfer with Series LC and LLC Resonance Operations Depending on Coupling Condition ». Electronics 9, no 4 (31 mars 2020) : 592. http://dx.doi.org/10.3390/electronics9040592.

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This paper analyzes the output voltage of an inductive wireless power transfer (WPT) depending on coupling conditions. When the optimum efficiency and maximum output power are obtained, it is called critical coupling, so the receiving coil and the transmitting coil should be separated by a certain distance. When the distance between the transmitting coil and receiving coil is very short, it is called over coupling, and output power decreases with the optimal operating state of the critical coupling condition. To design the entire circuit system for the inductive WPT depending on the coupling condition, it is beneficial to analyze the output voltage according to a load variation, an input voltage, and an operating frequency. Therefore, the output voltage depending on the coupling condition in the inductive WPT is analyzed in this paper. The output voltage gain in critical coupling condition is greater than one and is not affected by a load variation by a series LC resonant operation. The reduced output power in an over coupling condition can be recovered by a series LLC resonant operation. In addition, the output voltage gain is almost one and is affected by the load variation in the over coupling condition. A 5W prototype is implemented with the wireless power consortium standard coils and experimental results are shown to verify theoretical analysis and operation.
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IMADO, Keiji, et Kiyoshi TERADA. « Novel coupling applicable in off-centered condition ». Mechanical Engineering Journal 3, no 1 (2016) : 15–00328. http://dx.doi.org/10.1299/mej.15-00328.

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Yang, Jun, et Tadanobu Sato. « Influence of viscous coupling on seismic reflection and transmission in saturated porous media ». Bulletin of the Seismological Society of America 88, no 5 (1 octobre 1998) : 1289–99. http://dx.doi.org/10.1785/bssa0880051289.

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Abstract Wave propagation in saturated porous media involves complicated couplings between the solid skeleton and pore fluid. In particular, viscous coupling plays a key role because in general it makes wave propagation dispersive and dissipative. Although the importance of the viscous coupling in wave propagation in an unbounded saturated medium was recognized, the knowledge of its effect on the reflection and transmission from a saturated porous boundary is limited. A detailed investigation is therefore carried out in this article on the influence of viscous coupling in the reflection and transmission at an interface between saturated porous media and ordinary elastic media. The interface is considered to be either permeable or impermeable to include the effect of hydraulic boundary condition. In particular, the dependence of viscous coupling effect on the hydraulic condition at the interface is studied in this article. The variations of the reflection and transmission coefficients with the angle of incidence as well as the frequency for different values of viscous coupling are computed and compared for permeable interface and impermeable interface. In addition, the seismic reflection in two extreme cases of viscous coupling, that is, null viscous coupling and infinite viscous coupling, is discussed. The results indicate that the effect of viscous coupling is complicated; it depends strongly on the hydraulic condition at the interface as well as the frequency of the incident wave. Additionally, it depends upon the angle of incidence.
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Feng, Wei, Yaming Tang et Bo Hong. « Landslide Hazard Assessment Methods along Fault Zones Based on Multiple Working Conditions : A Case Study of the Lixian–Luojiabu Fault Zone in Gansu Province (China) ». Sustainability 14, no 13 (2 juillet 2022) : 8098. http://dx.doi.org/10.3390/su14138098.

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Traditional landslide hazard assessment methods generally use the same evaluation model to carry out assessments under different working conditions. Due to the differences in landslide influence factors and model calculation methods considered under different working conditions, the evaluation results obtained using traditional methods are different from those of real-world scenarios. Therefore, research on optimal landslide hazard assessment methods for different working conditions is important for disaster prevention and mitigation in areas along fault zones. Taking the section along the Lixian–Luojiabu fault zone in Gansu province in China as the research area, a landslide hazard assessment was carried out under rainfall and earthquake conditions. A method based on the fractal theory–information coupling model is proposed for the rainfall condition, and a method based on an improved Newmark model considering matric suction is proposed for the earthquake condition. Under the rainfall condition, a landslide hazard assessment was carried out using the information model, the logistic regression model, the fractal theory model, the logistic regression–information coupling model and the fractal theory–information coupling model. Meanwhile, under the earthquake condition, an assessment was carried out using the traditional Newmark model and the improved Newmark model considering matric suction. Finally, the ROC curve and Kappa coefficient were used to test the accuracy of these evaluation models and to determine the optimal model under different working conditions. The results showed that the fractal theory–information coupling model had the largest AUC value and Kappa coefficient value under the rainfall condition (0.856 and 0.807, respectively). The test value of the logistic regression–information coupling model was second, and the values of the other three models were all lower than 0.8. This shows that the evaluation of the fractal theory–information coupling model is better than those of the other models under the rainfall condition. The AUC value and Kappa coefficient of the improved Newmark model under the earthquake condition were 0.805 and 0.794, respectively, which were larger than the test values of the traditional Newmark model. This shows that the evaluation of the proposed model is better than that of the traditional Newmark model under the earthquake condition. These research results provide a reference for landslide hazard assessments in areas with similar characteristics.
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Thèses sur le sujet "Coupling condition"

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Trovant, Michael. « A boundary condition coupling strategy for the modeling of metal casting processes ». Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0011/NQ35346.pdf.

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CAMONES, LUIS ARNALDO MEJIA. « NUMERICAL SIMULATION OF THE CRACK PROPAGATION PROCESS IN ROCK MATERIAL UNDER FLUIDMECHANIC COUPLING CONDITION ». PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2015. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=27046@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
Esta pesquisa aborda o processo de fraturamento hidráulico ou processo de propagação de fraturas em rocha através da injeção de um fluido sob pressão, o que gera fissuras no material que se propagam de acordo com a quantidade de fluido injetado. Esta técnica leva a um incremento da transmissividade hidráulica da rocha e, como consequência, ocorre um incremento da produção de óleo. Diversos trabalhos analíticos e numéricos têm sido propostos para estudar o mecanismo de fratura, geralmente baseados em meios contínuos ou através da utilização de elementos de interface em uma trajetória de propagação conhecida. Neste trabalho, a propagação de uma fratura é simulada utilizando o modelo potencial PPR[72] através da sua implementação extrínseca. Assim, os elementos coesivos de interface são inseridos na malha de elementos finitos de forma adapativa para capturar o processo de fraturamento. A pressão do fluido é simulada utilizando o modelo de lattice-Boltzmann[84]. Através de um processo interativo, os contornos da fratura, computados utilizando o método dos elementos finitos, são transferidos para o modelo de lattice-Boltzmann como uma condição de contorno. Assim, a força que o fluido exerce nestes contornos, gerada pela injeção do fluido, pode ser calculada. Estas forças são utilizadas no modelo de elementos finitos como uma força externa aplicada nas faces da fratura. A nova posição das faces da fratura é calculada e transferida novamente para o modelo de lattice-Boltzmann como condição de contorno. Este processo interativo fluido-estrutura permite modelar o processo de fraturamento hidráulico em trajetórias de propagação irregulares.
This research addresses hydraulic fracturing or hydro-fracking, i.e. fracture propagation process in rocks through the injection of a fluid under pressure, which generates cracks in the rock that propagate according to the amount of fluid injected. This technique leads to an increase of the hydraulic transmissivity of the rock mass and, consequently, improves oil production. Several analytical and numerical models have been proposed to study this fracture mechanism, generally based in continuum mechanics or using interface elements through a known propagation path. In this work, the crack propagation is simulated using the PPR potential-based cohesive zone model[72] by means of an extrinsic implementation. Thus, interface cohesive elements are adaptively inserted in the mesh to capture the softening fracture process. The fluid pressure is simulated using the lattice Boltzmann model[84] through an iterative procedure. The boundaries of the crack, computed using the finite element method, are transferred to the lattice Bolztmann model as boundary conditions, where the fluid pressure (or fluid forces) applied on these boundaries, caused by the fluid injected, can be calculated. These forces are then used in the finite element model as external forces applied on the faces of the crack. The new position of the crack faces is then calculated and transferred to the lattice-Boltzmann model to update the boundary conditions. This feedback-loop for fluid-structure interaction allows modeling of hydraulic fracturing processes for irregular path propagation.
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Louis, Pierre-Yves. « Coupling, space and time Mixing for parallel stochastic dynamics ». Universität Potsdam, 2004. http://opus.kobv.de/ubp/volltexte/2011/5156/.

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We first introduce some coupling of a finite number of Probabilistic Cellular Automata dynamics (PCA), preserving the stochastic ordering. Using this tool, for a general attractive probabilistic cellular automata on SZd, where S is finite, we prove that a condition (A) is equivalent to the (time-) convergence towards equilibrium of this Markovian parallel dynamics, in the uniform norm, exponentially fast. This condition (A) means the exponential decay of the influence from the boundary for the invariant measures of the system restricted to finite ‘box’-volume. For a class of reversible PCA dynamics on {−1, +1}Zd
with a naturally associated Gibbsian potential ϕ, we prove that a Weak Mixing condition for ϕ implies the validity of the assumption (A); thus the ‘exponential ergodicity’ of the dynamics towards the unique Gibbs measure associated to ϕ holds. On some particular examples of this PCA class, we verify that our assumption (A) is weaker than the Dobrushin-Vasershtein ergodicity condition. For some special PCA, the ‘exponential ergodicity’ holds as soon as there is no phase transition.
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Liu, Shimin. « ESTIMATION OF DIFFERENT COAL COMPRESSIBILITIES OF COALBED METHANE RESERVOIRS UNDER REPLICATED IN SITU CONDITION ». OpenSIUC, 2012. https://opensiuc.lib.siu.edu/dissertations/481.

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Studies completed recently have shown that desorption of methane results in a change in the matrix volume of coal thus altering the permeability of, and production rates from, coalbed methane (CBM) reservoirs. An accurate estimation of different coal compressibilities is, therefore, critical in CBM operations in order to model and project gas production rates. Furthermore, a comprehensive knowledge of the dynamic permeability helps in understanding the unique feature of CBM production, an initial negative gas decline rate. In this study, different coal compressibility models were developed based on the assumption that the deformation of a depleting coalbed is limited to the vertical direction, that is, the reservoir is under uniaxial strain conditions. Simultaneously, experimental work was carried out replicating these conditions. The results showed that the matrix volumetric strain typically follows the Langmuir-type relationship. The agreement between the experimental results and those obtained using the proposed model was good. The proposed volumetric strain model successfully isolated the sorption-induced strain from the strain resulting from mechanical compression. It, therefore, provides a technique to integrate the sorption-induced strain alone into different analytical permeability models. The permeability variation of coal with a decrease in pore pressure under replicated in situ stress/strain conditions was measured. The results showed that decreasing pore pressure resulted in a significant decrease in horizontal stress and increased permeability. The permeability increased non-linearly with decreasing pore pressure, with a small increase in the high pressure range, increasing progressively as the pressure dropped below a certain value. The experimental results were also used to test the proposed coupled sorption-induced strain model and several analytical permeability models. One of the commonly used models overestimated the permeability increase between 200 and 900 psi. The other two models were able to predict the permeability trend with constant cleat compressibility although the values used for the two models were different. Finally, the coupled strain and permeability models were employed to validate the field observed permeability increase data. The results indicated that the coupled models can predict the permeability trend with accuracy as long as the input parameters used are reasonable. The technique can thus serve as a particularly powerful tool for new CBM regions with limited production data since it only requires the basic adsorption data and mechanical properties and both are typically available. However, the physical meaning of the cleat compressibility term used in the permeability models needs to be clarified to ensure that its effect is not counted twice.
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Case, Sandra Lynn. « Fundamental Importance of Fillers, Cure Condition, and Crosslink Density on Model Epoxy Properties ». Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/28059.

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The influence of silane treated amorphous fumed silica fillers on properties of the cured epoxy was examined in the first part of the study. Silica particles were treated with 3- aminopropyldiethoxymethylsilane (APDS) and 3-aminopropyltriethoxysilane (APTS) coupling agents. The filler and coupling agents decreased the mobility of the polymer chains in the vicinity of the filler leading to an increase in the activation energy for the glass transition and an increase in cooperativity. Fumed silica did not significantly affect moisture diffusion properties. Next, a linear dilatometer was used to investigate the effects of cure conditions, mold types, and the presence of filler in the model epoxy. These studies revealed that there was substantial shrinkage in the cured epoxy on heating it through its glass transition region. The shrinkage was determined to be the result of stress in the epoxy generated during cure and could be minimized by curing at lower temperatures, followed by a postcuring heat treatment. Additional free volume in the sample increased the magnitude of the shrinkage by allowing increased stress release through increased network mobility. Decreasing the polymer mobility by adding fillers decreased the observed shrinkage. The influence of the model epoxy crosslink density was examined by varying the content of 1,4-butanediol in the model system. Addition of 1,4-butanediol led to a decrease in the modulus and glass transition temperature, which resulted in a reduction in residual stress and subsequent shrinkage. Moisture uptake increased with the addition of 1,4-butanediol due to an increase in the free volume of the epoxy. However, even with greater moisture uptake, the addition of 1,4-butanediol to the epoxy increased its adhesion to quartz by promoting lower residual stress and increased energy dissipation. These results indicate that bulk diffusion of water is not the controlling factor in adhesive degradation in this system.
Ph. D.
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Борзенец, М. В., et В. П. Бородай. « Зубчатая муфта как причина износа упорного подшипника турбовоздуходувки типа ПП-3725/04 на производствах серной кислоты ». Thesis, Издательство СумГУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/21671.

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В докладе рассмотрена проблема износа упорной части опорно-упорного подшипника. Основной причиной называют неисправность зубчатой муфты. Рассмотрены условия приведшие к износу зубчатой муфты. Приведены результаты вибрационного обследования агрегата. Сделаны соответствующие выводы. При цитуванні документа, використовуйте посилання http://essuir.sumdu.edu.ua/handle/123456789/21671
The report is devoted to the problem of wearing thrust part of journal and thrust bearing. The principal cause is specified as an inaccuracy in gear coupling. There considered the conditions resulted in deterioration of gear coupling. There represented the results of analyzing vibration state of the unit. There formulated corresponding conclusions. При цитировании документа, используйте ссылку http://essuir.sumdu.edu.ua/handle/123456789/21671
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Müller-Bierl, Bernd Michael. « Rayonnement et couplage entre les interconnexions dans les circuits hyperfréquences : étude au moyen de la méthode tlm ». Grenoble INPG, 1997. http://www.theses.fr/1997INPG0026.

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La these est constitue de 3 parties principales. Apres une introduction a l'analyse des lignes micro-ruban sous approximation de propagation des signaux en mode tem, la premiere partie traite d'une methode d'anaulyse dynamique valable pour des distributions de champs qui peuvent meme etre eloignees du mode tem, la methode tlm (transmission line matrix method), introduite 1971 par johns et al. La methode tlm est presentee comme un processus de repartition base sur la decomposition des equations de maxwell sous forme matricielle. Dans une deuxieme partie nous traitons de la possibilite d'utiliser la methode tlm dans les problemes dits de l'espace ouvert, c'est a dire des espaces de calcul limites par des parois absorbant toute l'energie quittant le domaine de calcul. Cela est necessaire afin de reduire l'espace memoire necessaire pour calculer par example des effets de rayonnement et de diffraction. Dans la troisieme partie nous appliquons la methode tlm pour calculer les parametres des differents discontinuites micro-ruban, en particulier les effets de couplage et de rayonnement. Au moyen d'une transformation des champs proches en champs lointain nous determinons egalement les diagrammes de rayonnement correspondants. L'ensemble du travail se situe dans le cadre des problemes de compatibilite electromagnetique.
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Fajardo, Peña Pablo. « Methodology for the Numerical Characterization of a Radial Turbine under Steady and Pulsating Flow ». Doctoral thesis, Universitat Politècnica de València, 2012. http://hdl.handle.net/10251/16878.

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The increasing use of turbochargers is leading to an outstanding research to understand the internal flow in turbomachines. In this frame, computational fluid dynamics (CFD) is one of the tools that can be applied to contribute to the analysis of the fluid-dynamic processes occurring in a turbine. The objective of this thesis is the development of a methodology for performing simulations of radial turbomachinery optimizing the available computational resources. This methodology is used for the characterization of a vaned-nozzle turbine under steady and pulsating flow conditions. An important effort has been devoted in adjusting the case configuration to maximize the accuracy achievable with a certain computational cost. Concerning the cell size, a local mesh independence analysis is proposed as a procedure to optimize the distribution of cells in the domain, thus allowing to use a finer mesh in the most suitable places. Particularly important in turbomachinery simulations is the influence of the approach for simulating rotor motion. In this thesis two models have been compared: multiple reference frame and sliding mesh. The differences obtained using both methods were found to be significant in off-design regions. Steady flow CFD results have been validated against global measurements taken on a gas-stand. The modeling of a turbine, installed either on a turbocharger test rig or an engine, requires the calculation of the flow in the ducts composing the system. Those ducts could be simulated assuming a one-dimensional (1D) approximation, and thus reducing the computational cost. In this frame of ideas, two CFD boundary conditions have been developed. The first one allows performing coupled 1D-3D simulations, communicating the flow variables from each domain through the boundary. The second boundary condition is based in a new formulation for a stand-alone anechoic end, which intends to represent the flow behavior of an infinite duct. Finally, the turbine was simulat
Fajardo Peña, P. (2012). Methodology for the Numerical Characterization of a Radial Turbine under Steady and Pulsating Flow [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/16878
Palancia
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Somers, Julia Marie. « Macroscopic Coupling Conditions with Partial Blocking for Highway Ramps ». Master's thesis, Temple University Libraries, 2015. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/326572.

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Mathematics
M.S.
We consider the Lighthill-Whitman-Richards traffic model on a network consisting of a highway with an off ramp, connected by a junction. We compare the known coupling conditions for the evolution of traffic at the junction and suggest a novel improvement to the existing conditions. That is, we resolve the spurious effects that arise in standard models, namely clogging of the main highway and vehicle destination changes. We achieve this by tracking vehicle density buildup in the form of a queue, which is modeled by an ODE. We define the solution to the Riemann problem at the junction using the supply and demand functions. The numerical approximation is carried out using a modified Godunov scheme, adjusted to take into account the effects of an emptying queue. Exact and numerical comparisons of the model with existing models verify that the number of vehicles who wish to exit are preserved and the nonphysical clogging of the main highway does not occur.
Temple University--Theses
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Mikhaylenko, Maxim A. « Development and Application of the Boundary Singularity Method to the Problems of Hydrodynamic and Viscous Interaction ». University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1442423671.

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Livres sur le sujet "Coupling condition"

1

Trovant, Michael. A boundary condition coupling strategy for the modeling of metal casting processes. Ottawa : National Library of Canada = Bibliothèque nationale du Canada, 1998.

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2

Banks, H. Thomas. Parameter estimation in a structural acoustic system with fully nonlinear coupling conditions. Hampton, Va : Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1994.

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C, Smith R., et Institute for Computer Applications in Science and Engineering., dir. Parameter estimation in a structural acoustic system with fully nonlinear coupling conditions. Hampton, Va : Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1994.

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4

United States. National Aeronautics and Space Administration., dir. Modeling of the coupled magnetospheric and neutral wind dynamos : Final technical report, SRI project 4604, grant NAGW-3508. Menlo Park, CA : SRI International, 1997.

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Nakov, Svetlin. Fundamentals of Computer Programming with C# : The Bulgarian C# Book. Sofia, Bulgaria : Svetlin Nakov, 2013.

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SARAIVA, Y. N. Advances in the iterative coupling between flow-geomechanical simulators : applied to cases with different contour conditions. Dialética, 2022. http://dx.doi.org/10.48021/978-65-252-2865-5.

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Lambin, Xavier. The population dynamics of bite-sized predators : prey dependence, territoriality, and mobility. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198759805.003.0004.

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The dependency of mustelid demographic rates on prey abundance has the potential to cause a strong coupling between predator-prey populations. Data on mustelid dynamics show that such strong reciprocal interactions only materialise in some restricted conditions. Bite-size mustelid predators searching for scarce, depleted prey expose themselves to increased risk of predation by larger predators of small mammal that are themselves searching for similar prey species. As voles or muskrats become scarcer, weasels and mink searching for prey over larger areas become increasingly exposed to intra-guild predation, unless they operate in a habitat refuge such as the sub-nivean space. Where larger predators are sufficiently abundant or exert year-round predation pressure on small mustelids, their impact on mustelids may impose biological barrier to dispersal that are sufficient to weaken the coupling between small mustelids and their rodent prey, and thus impose a degree of top down limitation on mustelids.
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Tiwari, Sandip. Electromechanics and its devices. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198759874.003.0005.

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Electromechanics—coupling of mechanical forces with others—exhibits a continuum-to-discrete spectrum of properties. In this chapter, classical and newer analysis techniques are developed for devices ranging from inertial sensors to scanning probes to quantify limits and sensitivities. Mechanical response, energy storage, transduction and dynamic characteristics of various devices are analyzed. The Lagrangian approach is developed for multidomain analysis and to bring out nonlinearity. The approach is extended to nanoscale fluidic systems where nonlinearities, fluctuation effects and the classical-quantum boundary is quite central. This leads to the study of measurement limits using power spectrum and, correlations with slow and fast forces. After a diversion to acoustic waves and piezoelectric phenomena, nonlinearities are explored in depth: homogeneous and forced conditions of excitation, chaos, bifurcations and other consequences, Melnikov analysis and the classic phase portaiture. The chapter ends with comments on multiphysics such as of nanotube-based systems and electromechanobiological biomotor systems.
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Tiwari, Sandip. Electromagnetic-matter interactions and devices. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198759874.003.0006.

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This chapter explores electromagnetic-matter interactions from photon to extinction length scales, i.e., nanometer of X-ray and above. Starting with Casimir-Polder effect to understand interactions of metals and dielectrics at near-atomic distance scale, it stretches to larger wavelengths to explore optomechanics and its ability for energy exchange and signal transduction between PHz and GHz. This range is explored with near-quantum sensitivity limits. The chapter also develops the understanding phononic bandgaps, and for photons, it explores the use of energetic coupling for useful devices such as optical tweezers, confocal microscopes and atomic clocks. It also explores miniature accelerators as a frontier area in accelerator physics. Plasmonics—the electromagnetic interaction with electron charge cloud—is explored for propagating and confined conditions together with the approaches’ possible uses. Optoelectronic energy conversion is analyzed in organic and inorganic systems, with their underlying interaction physics through solar cells and its thermodynamic limit, and quantum cascade lasers.
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Levinson, Marjorie. Still Life without References or, The Plain Sense of Things. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198810315.003.0010.

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Analysis of “The Poems of Our Climate,” Wallace Stevens’s ars poetica, reveals the value of substituting the process of recursion for the reflexivity that we often consider to be part and parcel of lyric form. The relationship between the two notions is one of three couplings the chapter investigates, the other two being remediation and representation, and—drawing on Foucault—similitude and resemblance. In each case the first term in the pairing ends up the favored one. The resulting displacement generates for the poem both a formal distinctiveness in which resistance has no share, and—through etymological investigation—a new set of intertexts in poems by Keats not usually brought to bear in such contexts. In short, rather than resist its material conditions of representation, the poem thinks through them.
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Chapitres de livres sur le sujet "Coupling condition"

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Hmida, Atef, Ahmed Hammami, Fakher Chaari, Mohamed Taoufik Khabou et Mohamed Haddar. « Modal Analysis of Spur Gearbox with an Elastic Coupling ». Dans Applied Condition Monitoring, 153–63. Cham : Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-41459-1_15.

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Ben Arab, Safa, Slim Bouaziz et Mohamed Haddar. « Shear-Normal Coupling Effects on Composite Shafts Dynamic Behaviour ». Dans Applied Condition Monitoring, 243–50. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-76517-0_27.

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Ghorbel, Ahmed, Oussama Graja, Moez Abdennadher, Lassâad Walha et Mohamed Haddar. « Dynamic Analysis of a Pumping Station with Coupling Misalignment Fault ». Dans Applied Condition Monitoring, 71–78. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-76517-0_9.

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Hmida, Atef, Ahmed Hammami, Mohamed Taoufik Khabou, Fakher Chaari et Mohamed Haddar. « Dynamic Behavior of Spur Gearbox with an Elastic Coupling Under Acyclism Regime ». Dans Applied Condition Monitoring, 319–27. Cham : Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-61927-9_30.

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Bouslema, Marwa, Taher Fakhfakh, Rachid Nasri et Mohamed Haddar. « Vibration Analysis of Planetary Gear Connected by Flexible Coupling Using Substructuring Methodology ». Dans Applied Condition Monitoring, 198–206. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-85584-0_20.

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Hoede, C., et H. J. Smit. « On the Coupling Condition and Hamiltonicity ». Dans Topics in Combinatorics and Graph Theory, 373–80. Heidelberg : Physica-Verlag HD, 1990. http://dx.doi.org/10.1007/978-3-642-46908-4_42.

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Hmida, Atef, Ahmed Hammami, Fakher Chaari, Mohamed Taoufik Khabou et Mohamed Haddar. « Dynamic Behavior of Spur Gearbox with Elastic Coupling in the Presence of Eccentricity Defect Under Acyclism Regime ». Dans Applied Condition Monitoring, 123–32. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-96181-1_12.

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Meng, Ching I. « Auroral Oval Configuration During the Quiet Condition ». Dans Electromagnetic Coupling in the Polar Clefts and Caps, 61–85. Dordrecht : Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0979-3_5.

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Tsurkov, Vladimir. « Block Problems with a Special Condition for Coupling Variables ». Dans Large-scale Optimization — Problems and Methods, 263–300. Boston, MA : Springer US, 2001. http://dx.doi.org/10.1007/978-1-4757-3243-6_4.

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Hamdi, Hédi, Charfeddine Mrad et Rachid Nasri. « Effects of Gyroscopic Coupling on the Dynamics of a Wind Turbine Blade with Horizontal Axis ». Dans Condition Monitoring of Machinery in Non-Stationary Operations, 159–74. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-28768-8_17.

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Actes de conférences sur le sujet "Coupling condition"

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Ojeda-Castarleda, J., et P. Andres. « Coupling Condition For Irradiance Focal Symmetry ». Dans 14th Congress of the International Commission for Optics, sous la direction de Henri H. Arsenault. SPIE, 1987. http://dx.doi.org/10.1117/12.967253.

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Ramli, S., D. Birtwhistle, J. Lopez-Roldan et T. Tang. « EHV Circuit breaker condition monitoring using antenna-based coupling methods ». Dans 2008 International Conference on Condition Monitoring and Diagnosis. IEEE, 2008. http://dx.doi.org/10.1109/cmd.2008.4580306.

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Park, Hyeonsu, Edward J. Powers, W. Mack Grady et Ari Arapostathis. « Condition Monitoring Based on Estimating Complex Coupling Coefficients ». Dans 2008 IEEE Instrumentation and Measurement Technology Conference - I2MTC 2008. IEEE, 2008. http://dx.doi.org/10.1109/imtc.2008.4547143.

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Wang, Rubin, Zhikang Zhang et Enhua Shen. « Energy Evolution of Neural Population under Coupling Condition ». Dans Third International Conference on Natural Computation (ICNC 2007). IEEE, 2007. http://dx.doi.org/10.1109/icnc.2007.355.

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Jingmin Zhang, Zhiqiang Du et Weifeng Sun. « The Coupling Research on Operating Condition and Decision-Making Condition of China's Project ». Dans 2008 International Seminar on Business and Information Management (ISBIM 2008). IEEE, 2008. http://dx.doi.org/10.1109/isbim.2008.229.

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Zhu, W. B., B. X. Du, J. Li, J. P. Jiang, H. He, W. Li, L. Wei, X. C. Wang et H. Du. « Effects of Temperature on Surface Charge Behavior of Fluorinated Oil-impregnated Paper under the Coupling of DC and Pulse Voltages ». Dans 2018 Condition Monitoring and Diagnosis (CMD). IEEE, 2018. http://dx.doi.org/10.1109/cmd.2018.8535645.

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Ma, Cheng, Fan Zhang, Jiangyang Zhan, Lingfeng Jin, Zhi Yang et Suning Liang. « Study on Electromagnetic-Mechanical Coupling Effect of Transformer Winding under Short Circuit ». Dans 2022 9th International Conference on Condition Monitoring and Diagnosis (CMD). IEEE, 2022. http://dx.doi.org/10.23919/cmd54214.2022.9991530.

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Wang, Linjie, Yiying Liu, Fengmei Li, Wencheng Fu, Zhenyu Zhao et Ke Yu. « Sensitivity optimization of the optical coupling fiber sensor for acoustic sensing of partial discharges ». Dans 2016 International Conference on Condition Monitoring and Diagnosis (CMD). IEEE, 2016. http://dx.doi.org/10.1109/cmd.2016.7757814.

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Wu, Weidong, Murad A. Qurishee, Joseph Owino, Ignatius Fomunung, Mbakisya Onyango et Babatunde Atolagbe. « Coupling Deep Learning and UAV for Infrastructure Condition Assessment Automation ». Dans 2018 IEEE International Smart Cities Conference (ISC2). IEEE, 2018. http://dx.doi.org/10.1109/isc2.2018.8656971.

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Komada, Meguru, et Shin’ichi Nojiri. « The Born-Infeld Gravity in the Palatini Formalism and the Condition of the Black Hole Formation ». Dans Sakata Memorial Workshop on Origin of Mass and Strong Coupling Gauge Theories. WORLD SCIENTIFIC, 2017. http://dx.doi.org/10.1142/9789813231467_0043.

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Rapports d'organisations sur le sujet "Coupling condition"

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Gardner, C. J. Identification of matrix conditions that give rise to the linear coupling resonances. Office of Scientific and Technical Information (OSTI), mars 2009. http://dx.doi.org/10.2172/957466.

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Gardner C. J. Identification of Matrix Conditions that Give Rise to the Linear Coupling Resonances. Office of Scientific and Technical Information (OSTI), mars 2009. http://dx.doi.org/10.2172/1061944.

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D'Elia, Marta, Pavel Bochev, Mauro Perego, Jeremy Trageser et David Littlewood. An optimization-based strategy for peridynamic-FEM coupling and for the prescription of nonlocal boundary conditions. Office of Scientific and Technical Information (OSTI), octobre 2021. http://dx.doi.org/10.2172/1825041.

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Wang, Qing. Understand the Air-Sea Coupling Processes in High Wind Conditions Using a Synthesized Data Analysis/Modeling Approach. Fort Belvoir, VA : Defense Technical Information Center, septembre 2008. http://dx.doi.org/10.21236/ada532817.

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Wang, Qing. Understand the Air-Sea Coupling Processes in High Wind Conditions Using a Synthesized Data Analysis/modeling Approach. Fort Belvoir, VA : Defense Technical Information Center, septembre 2007. http://dx.doi.org/10.21236/ada541432.

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Douglas, Thomas, et Caiyun Zhang. Machine learning analyses of remote sensing measurements establish strong relationships between vegetation and snow depth in the boreal forest of Interior Alaska. Engineer Research and Development Center (U.S.), juillet 2021. http://dx.doi.org/10.21079/11681/41222.

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The seasonal snowpack plays a critical role in Arctic and boreal hydrologic and ecologic processes. Though snow depth can be different from one season to another there are repeated relationships between ecotype and snowpack depth. Alterations to the seasonal snowpack, which plays a critical role in regulating wintertime soil thermal conditions, have major ramifications for near-surface permafrost. Therefore, relationships between vegetation and snowpack depth are critical for identifying how present and projected future changes in winter season processes or land cover will affect permafrost. Vegetation and snow cover areal extent can be assessed rapidly over large spatial scales with remote sensing methods, however, measuring snow depth remotely has proven difficult. This makes snow depth–vegetation relationships a potential means of assessing snowpack characteristics. In this study, we combined airborne hyperspectral and LiDAR data with machine learning methods to characterize relationships between ecotype and the end of winter snowpack depth. Our results show hyperspectral measurements account for two thirds or more of the variance in the relationship between ecotype and snow depth. An ensemble analysis of model outputs using hyperspectral and LiDAR measurements yields the strongest relationships between ecotype and snow depth. Our results can be applied across the boreal biome to model the coupling effects between vegetation and snowpack depth.
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Banin, Amos, Joseph Stucki et Joel Kostka. Redox Processes in Soils Irrigated with Reclaimed Sewage Effluents : Field Cycles and Basic Mechanism. United States Department of Agriculture, juillet 2004. http://dx.doi.org/10.32747/2004.7695870.bard.

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The overall objectives of the project were: (a) To measure and study in situ the effect of irrigation with reclaimed sewage effluents on redox processes and related chemical dynamics in soil profiles of agricultural fields. (b) To study under controlled conditions the kinetics and equilibrium states of selected processes that affect redox conditions in field soils or that are effected by them. Specifically, these include the effects on heavy metals sorption and desorption, and the effect on pesticide degradation. On the basis of the initial results from the field study, increased effort was devoted to clarifying and quantifying the effects of plants and water regime on the soil's redox potential while the study of heavy metals sorption was limited. The use of reclaimed sewage effluents as agricultural irrigation water is increasing at a significant rate. The relatively high levels of suspended and, especially, dissolved organic matter and nitrogen in effluents may affect the redox regime in field soils irrigated with them. In turn, the changes in redox regime may affect, among other parameters, the organic matter and nitrogen dynamics of the root zone and trace organic decomposition processes. Detailed data of the redox potential regime in field plots is lacking, and the detailed mechanisms of its control are obscure and not quantified. The study established the feasibility of long-term, non-disturbing monitoring of redox potential regime in field soils. This may enable to manage soil redox under conditions of continued inputs of wastewater. The importance of controlling the degree of wastewater treatment, particularly of adding ultrafiltration steps and/or tertiary treatment, may be assessed based on these and similar results. Low redox potential was measured in a field site (Site A, KibutzGivat Brenner), that has been irrigated with effluents for 30 years and was used for 15 years for continuous commercial sod production. A permanently reduced horizon (Time weighted averaged pe= 0.33±3.0) was found in this site at the 15 cm depth throughout the measurement period of 10 months. A drastic cultivation intervention, involving prolonged drying and deep plowing operations may be required to reclaim such soils. Site B, characterized by a loamy texture, irrigated with tap water for about 20 years was oxidized (Time weighted average pe=8.1±1.0) throughout the measurement period. Iron in the solid phases of the Givat Brenner soils is chemically-reduced by irrigation. Reduced Fe in these soils causes a change in reactivity toward the pesticide oxamyl, which has been determined to be both cytotoxic and genotoxic to mammalian cells. Reaction of oxamyl with reduced-Fe clay minerals dramatically decreases its cytotoxicity and genotoxicity to mammalian cells. Some other pesticides are affected in the same manner, whereas others are affected in the opposite direction (become more cyto- and genotoxic). Iron-reducing bacteria (FeRB) are abundant in the Givat Brenner soils. FeRB are capable of coupling the oxidation of small molecular weight carbon compounds (fermentation products) to the respiration of iron under anoxic conditions, such as those that occur under flooded soil conditions. FeRB from these soils utilize a variety of Fe forms, including Fe-containing clay minerals, as the sole electron acceptor. Daily cycles of the soil redox potential were discovered and documented in controlled-conditions lysimeter experiments. In the oxic range (pe=12-8) soil redox potential cycling is attributed to the effect of the daily temperature cycle on the equilibrium constant of the oxygenation reaction of H⁺ to form H₂O, and is observed under both effluent and freshwater irrigation. The presence of plants affects considerably the redox potential regime of soils. Redox potential cycling coupled to the irrigation cycles is observed when the soil becomes anoxic and the redox potential is controlled by the Fe(III)/Fe(II) redox couple. This is particularly seen when plants are grown. Re-oxidation of the soil after soil drying at the end of an irrigation cycle is affected to some degree by the water quality. Surprisingly, the results suggest that under certain conditions recovery is less pronounced in the freshwater irrigated soils.
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Elbaum, Michael, et Peter J. Christie. Type IV Secretion System of Agrobacterium tumefaciens : Components and Structures. United States Department of Agriculture, mars 2013. http://dx.doi.org/10.32747/2013.7699848.bard.

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Objectives: The overall goal of the project was to build an ultrastructural model of the Agrobacterium tumefaciens type IV secretion system (T4SS) based on electron microscopy, genetics, and immunolocalization of its components. There were four original aims: Aim 1: Define the contributions of contact-dependent and -independent plant signals to formation of novel morphological changes at the A. tumefaciens polar membrane. Aim 2: Genetic basis for morphological changes at the A. tumefaciens polar membrane. Aim 3: Immuno-localization of VirB proteins Aim 4: Structural definition of the substrate translocation route. There were no major revisions to the aims, and the work focused on the above questions. Background: Agrobacterium presents a unique example of inter-kingdom gene transfer. The process involves cell to cell transfer of both protein and DNA substrates via a contact-dependent mechanism akin to bacterial conjugation. Transfer is mediated by a T4SS. Intensive study of the Agrobacterium T4SS has made it an archetypal model for the genetics and biochemistry. The channel is assembled from eleven protein components encoded on the B operon in the virulence region of the tumor-inducing plasmid, plus an additional coupling protein, VirD4. During the course of our project two structural studies were published presenting X-ray crystallography and three-dimensional reconstruction from electron microscopy of a core complex of the channel assembled in vitro from homologous proteins of E. coli, representing VirB7, VirB9, and VirB10. Another study was published claiming that the secretion channels in Agrobacterium appear on helical arrays around the membrane perimeter and along the entire length of the bacterium. Helical arrangements in bacterial membranes have since fallen from favor however, and that finding was partially retracted in a second publication. Overall, the localization of the T4SS within the bacterial membranes remains enigmatic in the literature, and we believe that our results from this project make a significant advance. Summary of achievements : We found that polar inflations and other membrane disturbances relate to the activation conditions rather than to virulence protein expression. Activation requires low pH and nutrient-poor medium. These stress conditions are also reflected in DNA condensation to varying degrees. Nonetheless, they must be considered in modeling the T4SS as they represent the relevant conditions for its expression and activity. We identified the T4SS core component VirB7 at native expression levels using state of the art super-resolution light microscopy. This marker of the secretion system was found almost exclusively at the cell poles, and typically one pole. Immuno-electron microscopy identified the protein at the inner membrane, rather than at bridges across the inner and outer membranes. This suggests a rare or transient assembly of the secretion-competent channel, or alternatively a two-step secretion involving an intermediate step in the periplasmic space. We followed the expression of the major secreted effector, VirE2. This is a single-stranded DNA binding protein that forms a capsid around the transferred oligonucleotide, adapting the bacterial conjugation to the eukaryotic host. We found that over-expressed VirE2 forms filamentous complexes in the bacterial cytoplasm that could be observed both by conventional fluorescence microscopy and by correlative electron cryo-tomography. Using a non-retentive mutant we observed secretion of VirE2 from bacterial poles. We labeled the secreted substrates in vivo in order detect their secretion and appearance in the plant cells. However the low transfer efficiency and significant background signal have so far hampered this approach.
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THERMO-MECHANICAL COUPLING RESPONSE ANALYSIS OF THE BOX-PLATE PREFABRICATED STEEL STRUCTURE UNDER FIRE. The Hong Kong Institute of Steel Construction, août 2022. http://dx.doi.org/10.18057/icass2020.p.322.

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By calculating the thermo-mechanical coupling analysis model of the box-plate prefabricated steel structure, the thermodynamic response was gained, and the mechanical response analysis of key components and key measuring points was carried out, and the failure mode of the structure under fire and the fire resistance limit of seven fire scenarios were also obtained. The results show that, the fire source position has a great impact on the fire resistance endurance in the single-story structure. When the fire source was in the center, the film stress produced after the middle surface yield of the floor could provide the post buckling strength, effectively improving the fire resistance time. For the three-story structure, the fire resistance time would be shortened when the fire source was at the bottom. The fire endurance of each working condition had reached more than 1000s, and there was no obvious mutation at the maximum displacement in each direction. Above all, it shows that the box-plate prefabricated steel structure has great rigidity, good ductility, excellent fire resistance, and superior integrity.
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