Gotowe bibliografie tematyczne / Multi-physics processes

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Gotowa bibliografia na temat „Multi-physics processes”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Multi-physics processes"

Cross, M., T. N. Croft, A. K. Slone, A. J. Williams, N. Christakis, M. K. Patel, C. Bailey i K. Pericleous. "Computational Modelling of Multi-Physics and Multi-Scale Processes in Parallel". International Journal for Computational Methods in Engineering Science and Mechanics 8, nr 2 (13.02.2007): 63–74. http://dx.doi.org/10.1080/15502280601149510.

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Michel, A., H. Stang, M. Lepech i M. R. Geiker. "Multi-Physics and Multi-Scale Deterioration Modelling of Reinforced Concrete". Key Engineering Materials 665 (wrzesień 2015): 13–16. http://dx.doi.org/10.4028/www.scientific.net/kem.665.13.

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Deterioration of reinforced concrete infrastructure such as bridges, tunnels, and buildings represents one of the major challenges currently facing developed countries. While engineering tools and methods for structural modelling and design of new reinforced concrete infrastructure are mature, methods and tools for modelling decades-long deterioration and maintenance are much less developed. In this paper, a multi-physics and multi-scale modelling approach for structural deterioration of reinforced concrete components due to reinforcement corrosion is presented. The multi-disciplinary modelling approach includes physical, chemical, electrochemical, and fracture mechanical processes at the material and meso-scale, which are further coupled with mechanical deterioration processes at the structural scale.

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Cleeman, Jeremy, Kian Agrawala, Evan Nastarowicz i Rajiv Malhotra. "Partial-physics-informed multi-fidelity modeling of manufacturing processes". Journal of Materials Processing Technology 320 (listopad 2023): 118125. http://dx.doi.org/10.1016/j.jmatprotec.2023.118125.

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Vasenkov, Alex V. "Multi-physics Peridynamic Modeling of Damage Processes in Protective Coatings". Journal of Peridynamics and Nonlocal Modeling 3, nr 2 (8.01.2021): 167–83. http://dx.doi.org/10.1007/s42102-020-00046-7.

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Tao, W. K., D. Anderson, J. Chern, J. Entin, A. Hou, P. Houser, R. Kakar i in. "The Goddard multi-scale modeling system with unified physics". Annales Geophysicae 27, nr 8 (6.08.2009): 3055–64. http://dx.doi.org/10.5194/angeo-27-3055-2009.

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Abstract. Recently, a multi-scale modeling system with unified physics was developed at NASA Goddard. It consists of (1) a cloud-resolving model (CRM), (2) a regional-scale model, the NASA unified Weather Research and Forecasting Model (WRF), and (3) a coupled CRM-GCM (general circulation model, known as the Goddard Multi-scale Modeling Framework or MMF). The same cloud-microphysical processes, long- and short-wave radiative transfer and land-surface processes are applied in all of the models to study explicit cloud-radiation and cloud-surface interactive processes in this multi-scale modeling system. This modeling system has been coupled with a multi-satellite simulator for comparison and validation with NASA high-resolution satellite data. This paper reviews the development and presents some applications of the multi-scale modeling system, including results from using the multi-scale modeling system to study the interactions between clouds, precipitation, and aerosols. In addition, use of the multi-satellite simulator to identify the strengths and weaknesses of the model-simulated precipitation processes will be discussed as well as future model developments and applications.

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Amirante, Dario, Vlad Ganine, Nicholas J. Hills i Paolo Adami. "A Coupling Framework for Multi-Domain Modelling and Multi-Physics Simulations". Entropy 23, nr 6 (16.06.2021): 758. http://dx.doi.org/10.3390/e23060758.

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This paper describes a coupling framework for parallel execution of different solvers for multi-physics and multi-domain simulations with an arbitrary number of adjacent zones connected by different physical or overlapping interfaces. The coupling architecture is based on the execution of several instances of the same coupling code and relies on the use of smart edges (i.e., separate processes) dedicated to managing the exchange of information between two adjacent regions. The collection of solvers and coupling sessions forms a flexible and modular system, where the data exchange is handled by independent servers that are dedicated to a single interface connecting two solvers’ sessions. Accuracy and performance of the strategy is considered for turbomachinery applications involving Conjugate Heat Transfer (CHT) analysis and Sliding Plane (SP) interfaces.

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Surana, Karan S., Yongting Ma, Albert Romkes i J. N. Reddy. "Development of Mathematical Models and Computational Framework for Multi-physics Interaction Processes". Mechanics of Advanced Materials and Structures 17, nr 7 (19.10.2010): 488–508. http://dx.doi.org/10.1080/15376494.2010.509192.

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Samtaney, R., B. van Straalen, P. Colella i S. C. Jardin. "Adaptive mesh simulations of multi-physics processes during pellet injection in tokamaks". Journal of Physics: Conference Series 78 (1.07.2007): 012062. http://dx.doi.org/10.1088/1742-6596/78/1/012062.

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CROSS, M. "Modelling of industrial multi-physics processes--a key role for computational mechanics". IMA Journal of Management Mathematics 7, nr 1 (1.01.1996): 3–21. http://dx.doi.org/10.1093/imaman/7.1.3-a.

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Srivastava, Shekhar, Rajiv Kumar Garg, Vishal S. Sharma, Noe Gaudencio Alba-Baena, Anish Sachdeva, Ramesh Chand i Sehijpal Singh. "Multi-physics continuum modelling approaches for metal powder additive manufacturing: a review". Rapid Prototyping Journal 26, nr 4 (14.03.2020): 737–64. http://dx.doi.org/10.1108/rpj-07-2019-0189.

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Purpose This paper aims to present a systematic approach in the literature survey related to metal additive manufacturing (AM) processes and its multi-physics continuum modelling approach for its better understanding. Design/methodology/approach A systematic review of the literature available in the area of continuum modelling practices adopted for the powder bed fusion (PBF) AM processes for the deposition of powder layer over the substrate along with quantification of residual stress and distortion. Discrete element method (DEM) and finite element method (FEM) approaches have been reviewed for the deposition of powder layer and thermo-mechanical modelling, respectively. Further, thermo-mechanical modelling adopted for the PBF AM process have been discussed in detail with its constituents. Finally, on the basis of prediction through thermo-mechanical models and experimental validation, distortion mitigation/minimisation techniques applied in PBF AM processes have been reviewed to provide a future direction in the field. Findings The findings of this paper are the future directions for the implementation and modification of the continuum modelling approaches applied to PBF AM processes. On the basis of the extensive review in the domain, gaps are recommended for future work for the betterment of modelling approach. Research limitations/implications This paper is limited to review only the modelling approach adopted by the PBF AM processes, i.e. modelling techniques (DEM approach) used for the deposition of powder layer and macro-models at process scale for the prediction of residual stress and distortion in the component. Modelling of microstructure and grain growth has not been included in this paper. Originality/value This paper presents an extensive review of the FEM approach adopted for the prediction of residual stress and distortion in the PBF AM processes which sets the platform for the development of distortion mitigation techniques. An extensive review of distortion mitigation techniques has been presented in the last section of the paper, which has not been reviewed yet.

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Rozprawy doktorskie na temat "Multi-physics processes"

Davie, Colin Thorpe. "Particulate mechanics framework for modelling multi-physics processes in fracturing geomaterials". Thesis, University of Glasgow, 2002. http://theses.gla.ac.uk/5537/.

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The potential of particulate mechanics was explored with the purpose of developing a single software modelling framework in which to model multi-physics geomechanical problems. Individual particulate models were developed for solid, fluid and granular material phases, building onto the existing Distinct Element Modelling (DEM) environment Particle Flow Code in Three Dimensions (PFC3D), with the intention that they could be combined to represent a geomechanical problem of any configuration. Advantages of utilising PFC3D were firstly, its inbuilt feature allowing inter-particle bonding so that, in the limiting case, solid material could be represented and secondly, its embedded coding language, FISH, which allows the creation of user defined variables and functions which may be used to manipulate and modify the basic DEM code. The Particle Solid Model (PSM) employed a bonded particle assembly with the concept of constructing a determinate lattice to replace a continuum material. Basic particle interactions were handled by the DEM behaviour inherent to PFC3D and complex behaviour, such as fracturing, was realised through additional code written in FISH. The Particle Fluid Model (PFM) was created with the concept of developing a macroscopic particle representation of a fluid where the particles moved freely with the flow. Fluid behaviour was implemented by preventing physical contact of the DEM particles through force-separation laws representative of pressure and viscosity fields. These were again realised via FISH code. The Particle Proppant Model (PPM) would be implemented simply through the inherent capabilities of the PFC3D DEM code and would be used to represent granular material on a grain for grain basis. After initial development of the individual models, benchmark tests were carried out to evaluate their basic capabilities.

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Bressan, Fernando. "Multiphysics modeling for electroheat processes". Doctoral thesis, Università degli studi di Padova, 2015. http://hdl.handle.net/11577/3424122.

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Microwave heating is a process widely used for industrial processes, scientific applications, medical treatments, as well as for household appliances. The advantage of this technology is mainly related to the velocity of this heating process, important factor in order to meet the needs of the market. In fact, the heat sources are localized inside the load under heating, so reducing the process time. However, because of the involved frequencies and, sometimes, due to the costs of the devices involved in such processes, generally the quality (uniformity) of the microwave heating is pretty penalized. The progress of semiconductor technologies, along with the high quality and efficiency required from the consumers, seem to be the key points for the innovations in this sector. The multi-physic numerical modeling, coupled with the optimization techniques ever more efficient, leads to an accurate design of the heating process, as well as of the corresponding devices. The aim of the present work consists in the development of numerical multiphysics models, simulating microwave heating processes for household applications (microwave ovens) and medical devices (hyperthermia treatments). The experimental validations confirm the reliability of the proposed methods
Il riscaldamento a microonde è un processo largamente impiegato nei settori industriale, medico e domestico. Il vantaggio legato all'utilizzo di questa tecnologia consiste nell'elevata velocità del processo di riscaldamento, fattore di rilevante importanza al fine di soddisfare le esigenze del mercato. Le sorgenti di calore vengono infatti localizzate direttamente nel carico oggetto di riscaldamento, riducendo i tempi di processo. Tuttavia, a causa delle frequenze in gioco e talvolta dei costi legati ai dispositivi coinvolti in tali processi, generalmente la qualità (uniformità) del riscaldamento viene penalizzata. Il progresso nel settore delle tecnologie dei semiconduttori, assieme alle richieste di qualità ed efficienza sempre più stringenti da parte dei consumatori, sembrano essere i punti chiave per l'innovazione tecnologica in questo settore. L'impiego di metodologie di simulazione multifisiche al calcolatore, accoppiate a tecniche di ottimizzazione sempre più performanti, permette un'accurata progettazione del processo di riscaldamento e dei relativi dispositivi. Il presente lavoro si pone l'obiettivo di sviluppare modelli numerici multifisici nel settore dei riscaldamenti a microonde per uso domestico (forni a microonde) e medicale (trattamenti di ipertermia). Le validazioni sperimentali sviluppate confermano l'affidabilità delle soluzioni e dei metodi proposti.

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Alqahtani, Moteb M. "Multi-photon processes in cavity QED". Thesis, University of Sussex, 2014. http://sro.sussex.ac.uk/id/eprint/49632/.

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Based on a multi-mode multi-level Jaynes-Cummings model and multi-photon resonance theory, a set of universal two-qubit and three-qubit gates has been realized where dual-rail qubits are encoded in cavities. In this way, the information has been stored in cavities and the off-resonant levels have been eliminated by the theory of an effective two-level Hamiltonian. A further model, namely the spin-J model, has been introduced so that a complete population inversion for levels of interest has been achieved and periodic multilevel multi-photon models have been performed. The combination of the two models has been employed to address two-level, three-level, four-level, and even five-level configurations. Considering the present cavity-QED experiments, several numerical simulations have been designed in order to check the robustness of the logic gates to variations in experimentally important parameters including the coupling constants and the detunings. Finally, based on Liouville's equation, and the wave-function treatments, the impact of decoherence processes on the fidelity of the qubit states in the iSWAP and the Fredkin gates has been studied. This thesis may have applications to quantum information processing, involving logic with simple quantum bits, with the possible application to the building of a quantum computer.

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Zhang, Shaojie. "Numerical simulation of mechanical interactions between liquid and solid phase in solidification processes". Thesis, Université Paris sciences et lettres, 2020. https://pastel.archives-ouvertes.fr/tel-02897918.

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La maîtrise des phénomènes de macroségrégation et des défauts liés à la déformation est le principal enjeu des processus de solidification. La modélisation numérique apporte une réponse aux besoins industriels pour maîtriser ces défauts. L'un des problèmes les plus critiques et essentiels est le calcul simultané de l'écoulement du fluide dans les régions liquides et de l'évolution contrainte-déformation dans les régions déjà solidifiées. Dans ce but spécifique, un algorithme de solution partitionnée est développé pour modéliser à la fois les processus de coulée en lingots et de coulée continue: l'écoulement de liquide induit par convection naturelle ou étape de remplissage, le retrait de solidification, la déformation thermiquement induite de la phase solide. Sur la base des deux champs de vitesse - solide et liquide résultant de cette résolution couplée, la résolution du transport des espèces chimiques (macroségrégation) est réalisée
Control of macrosegregation phenomena and deformation related defects is the main issue in solidification processes. Numerical modeling provides an answer to industrial needs to master these defects. One of the most critical and essential issues is the concurrent computation of fluid flow in the bulk liquid and stress-strain evolution in the already solidified regions. For this specific purpose, a partitioned solution algorithm is developed to model both ingot casting and continuous casting processes. Liquid flow induced by natural convection or filling step, solidification shrinkage and thermally induced deformation of the solid phase. On the basis of the resulting liquid and solid velocity fields, the transport of chemical species (macrosegregation) is achieved

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Hakhumyan, Hrant. "Study of optical and magneto processes in Rb atomic vapor layer of nanometric thickness". Phd thesis, Université de Bourgogne, 2012. http://tel.archives-ouvertes.fr/tel-00764958.

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Using a narrow-band resonant fluorescence spectra from a nano-cell with a thickness of L= [lambda]/2, and VSOP resonances formed at a thickness L =[lambda] ([lambda] is the wavelength of the resonant radiation), for the first time it was experimentally investigated the behaviour of the frequency and intensity (transition probabilities) of the atomic hyperfine structure transitions between the 85Rb, 87Rb, D1 and D2 lines Zeeman sublevels in external magnetic fields in range 5 - 7000G. The behaviour of tens of previously unstudied atomic transitions was analyzed and it is demonstrated that the intensities of these lines can both greatly increase, and decrease (tenfold). For the first time it is demonstrated that, in the case of partial pressure of neon buffer gas up to 6~torr into the nano-cell of thickness L = [lambda] filled with Rb, VSOP resonances are recorded confidently, while the addition of 0.1~torr neon buffer gas in a cell of a centimeter thickness leads to the complete disappearance of VSOP resonances formed with the help of the widely used technique of saturated absorption. It is demonstrated for the first time that the spectral width of the resonant fluorescence spectra of the rubidium nano-cell with thickness L= [lambda]/2, for all values of the neon buffer gas pressures is much narrower (6-8 times) compared with the resonant fluorescence spectra of an ordinary centimeter cell containing rubidium with the same pressures of neon

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Greenfield, Eric John. "Multi-Fluid Problems in Magnetohydrodynamics with Applications to Astrophysical Processes". Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/604867.

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I begin this study by presenting an overview of the theory of magnetohydrodynamics and the necessary conditions to justify the fluid treatment of a plasma. Upon establishing the fluid description of a plasma we move on to a discussion of magnetohydrodynamics in both the ideal and Hall regimes. This framework is then extended to include multiple plasmas in order to consider two problems of interest in the field of theoretical space physics. The first is a study on the evolution of a partially ionized plasma, a topic with many applications in space physics. A multi-fluid approach is necessary in this case to account for the motions of an ion fluid, electron fluid and neutral atom fluid; all of which are coupled to one another by collisions and/or electromagnetic forces. The results of this study have direct application towards an open question concerning the cascade of Kolmogorov-like turbulence in the interstellar plasma which we will discuss below. The second application of multi-fluid magnetohydrodynamics that we consider in this thesis concerns the amplification of magnetic field upstream of a collisionless, parallel shock. The relevant fluids here are the ions and electrons comprising the interstellar plasma and the galactic cosmic ray ions. Previous works predict that the streaming of cosmic rays lead to an instability resulting in significant amplification of the interstellar magnetic field at supernova blastwaves. This prediction is routinely invoked to explain the acceleration of galactic cosmic rays up to energies of 10¹⁵ eV. I will examine this phenomenon in detail using the multi-fluid framework outlined below. The purpose of this work is to first confirm the existence of an instability using a purely fluid approach with no additional approximations. If confirmed, I will determine the necessary conditions for it to operate.

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Prajapati, Nikunjkumar. "Development Of Quantum Information Tools Based On Multi-Photon Raman Processes In Rb Vapor". W&M ScholarWorks, 2020. https://scholarworks.wm.edu/etd/1616444554.

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Multi-photon nonlinear processes in atoms have served as important tools for quantum metrology, quantum communications, and quantum sensing. In this thesis, we experimentally address the interplay of various multi-photon Raman processes in hot Rb vapor, with the four-wave mixing (FWM) process being a central theme. FWM is the nonlinear response of a medium to a strong optical pump ﬁeld inelastically scattering oﬀ atomic resonances and resulting in the generation of additional photons in diﬀerent modes. FWM is a detrimental, but inherent part of electromagnetically induced transparency (EIT) and Raman based quantum memories. However, we were able to weaken the four-photon resonance by utilizing two-photon absorption to remove the additional photons without interfering with the signal beam. We also demonstrate the ability to tailor FWM to generate new photons in a controlled fashion for mode conversion. With this, we showed the conversion of 795 nm light to 420 nm light. While FWM is a source of noise in quantum memories, it can also be used for the generation squeezed twin-beams. Such beams have relative intensity noise reduced below the classical shot noise limit and share mode dependence based on the phase-matching conditions. Using this, we demonstrated that twin-beams can be generated with largely diﬀerent spatial structure (optical angular momentum) and still share strong correlations, so long as the phase-matching conditions are satisﬁed. We then constructed and demonstrated the operation of a polarization-based quantum interferometer using squeezed twin-beams and showed that our beams were entangled under the inseparability condition. Using this interferometer, we were also able to achieve squeezing at low detection frequencies, which is necessary for things like quantum imaging and gravitational wave detection. We also demonstrated that squeezed twin-beams can be utilized to enhance the sensitivity of two-photon absorption spectroscopy. This research has touched on many diﬀerent subjects related to quantum information science and improved upon some of the tools needed for the implementation of such technologies.

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Pinto, Marco. "Modelling and simulation of physics processes for in-beam imaging in hadrontherapy". Thesis, Lyon 1, 2014. http://www.theses.fr/2014LYO10330/document.

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L'hadronthérapie joue un rôle de plus en plus important au sein des techniques de radiothérapie grâce aux propriétés balistiques des ions et, dans le cas de ceux plus lourds que les protons, à une augmentation de l'efficacité biologique dans la région tumorale. Ces caractéristiques permettent une meilleure conformation de la dose délivrée au volume tumoral et elles permettent en particulier de traiter des tumeurs radio-résistantes. Elles conduisent cependant à une grande sensibilité du parcours des ions aux incertitudes du traitement. C'est dans ce contexte qu'a été proposée la détection de radiations secondaires émises lors des interactions nucléaires induites par les ions incidents dans le patient. La tomographie par émission de positons et la détection des rayons gamma prompts ont notamment fait l'objet d'une recherche intense ces dernières années. Le réseau de formation européen ENTERVISION, soutenu par la communauté ENLIGHT, a été crée fin 2009 pour développer ce type d'imagerie et, plus généralement, traiter les incertitudes de traitement en hadronthérapie. Le travail présenté dans ce manuscrit et intitulé ≪ Modélisation et simulation des processus physiques pour l'imagerie en ligne de l'hadronthérapie ≫ est l'un des nombreux travaux issus de ce projet. Bien que le sujet soit particulièrement large, le fil conducteur de ce travail a été une étude systématique visant in fine une implémentation d'un dispositif d'imagerie ≪ gamma prompts ≫ utilisable à la fois en faisceau de protons et d'ions carbone
Hadrontherapy is taking an increasingly important role in radiotherapy thanks to the ballistic properties of ions and, for those heavier than protons, an enhancement in the relative biological effectiveness in the tumour region. These features allow for a higher tumour conformality possible and gives the opportunity to tackle the problem of radioresistant tumours. However, they may lead to a great sensitivity of ion range to treatment uncertainties, namely to morphological changes along their path. In view of this, the detection of secondary radiations emitted after nuclear interactions between the incoming ions and the patient have been long proposed as ion range probes and, in this regard, positron emitters and prompt gammas have been the matter of intensive research. The European training network ENTERVISION, supported by the ENLIGHT community, was created in the end of 2009 in order to develop such imaging techniques and more generally to address treatment uncertainties during hadrontherapy. The present work is one of the many resulting from this project, under the subject “Modelling and simulation of physics processes for in-beam imaging in hadrontherapy”. Despite the extensive range of the topic, the purpose was always to make a systematic study towards the clinical implementation of a prompt-gamma imaging device to be used for both proton and carbon ion treatments

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Catoire, Fabrice. "Étude théorique et expérimentale de la double ionisation par impact électronique incluant l'effet Auger: Interférences d'échanges et de processus". Phd thesis, Université Paris Sud - Paris XI, 2006. http://tel.archives-ouvertes.fr/tel-00107969.

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Lors de ce travail de thèse, les mécanismes de double ionisation de l'argon par impact électronique incluant l'effet Auger ont été étudiés en fonction de l'énergie de l'électron
incident. Des sections efficaces cinq et six fois différentielles en angle et en énergie ont été mesurées et analysées en géométrie coplanaire.
La mise au point d'un nouvel analyseur toroïdal a permis d'améliorer l'efficacité de détection de l'ensemble du dispositif. La section efficace six fois différentielle où l'électron
Auger et l'électron éjecté ont des énergies identiques (205 eV) a ainsi été obtenue en première mondiale avec une cible d'argon, pour une énergie incidente de 956 eV.
Les modèles théoriques développés lors de ce travail représentent le triple continuum par un ensemble d'ondes coulombiennes décrivant les interactions entre les trois électrons de la voie de sortie et l'ion résiduel. Les effets d'échange entre les électrons ont aussi été inclus dans les modèles.
La confrontation des résultats expérimentaux et théoriques a permis de mettre en évidence la contribution relative de l'effet Auger et de la double ionisation directe sur la dépendance angulaire de la section efficace quintuplement différentielle, révélant en particulier une influence de l'effet Auger d'autant plus importante que l'énergie incidente est élevée.

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Ben, Masaud Taha. "Development of low temperature fabrication processes of n-ZnO/p-Si optical switch and poly-silicon waveguides for CMOS-compatible multi-layered silicon photonics". Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/370612/.

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The potential advantages and applications of Silicon Photonics (SiP) has initiated substantial research efforts. Silicon photonics has been favourably nominated to replace the current copper interconnects due to their high bandwidth, small footprint, and potentially low power consumption. However, the majority of the research into silicon photonics has been based on the silicon-on insulator (SOI) platform. The focus on the SOI platform has limited the design of silicon photonic devices to two-dimensional (2D) structures. Moreover, the fabrication of optical active devices based on silicon photonics has relied on high temperature processing that is not compatible with CMOS back-end integration. New materials that are depositable at low temperatures can offer new possibilities for multi-layered, CMOS back-end compatible, and low optical loss silicon photonic devices. In this project, zinc oxide (ZnO) was investigated as a potential low temperature material whose fabrication is compatible with CMOS technology. Specifically, the naturally n-type doped ZnO can potentially form a heterojunction with p-type silicon without the need for high temperature processing. Poly-silicon is also a depositable and CMOS compatible material that can potentially form future multi-layered silicon photonic structures. However, low optical loss in poly-silicon has been based on high-temperature processing to improve the crystallinity and roughness of the deposited material. The deposition of poly-silicon in the SiP technology have been mainly carried out using plasma-enhanced chemical vapour deposition (PECVD) and other deposition techniques remain under investigated. In this project, ZnO was, for the first time, deposited at low-temperature (150 ˚C) using atomic layer deposition (ALD) on a silicon waveguide to form a heterojunction diode capable of producing optical switching in the silicon core. Optical switching in the n-ZnO/p-Si heterojunction was caused by the plasma dispersion effect. The design of the optical switch comprised a straight silicon waveguide (width = 1000 nm, height = 220 nm, slabheight = 60 nm) partially covered with a thin ZnO film (thickness = 10 nm). The commonly used highly doped p+ region were not included in the devices because of the high thermal budget (T ' 900 ˚C) needed to activate the dopant. Moreover, the aluminium (Al) metal contacts were not annealed because the annealing temperature (Ts = 425˚C) exceeds the high-temperature threshold (Ts = 400˚C). An extinction ratio of ~ 10 dB was achieved for a 1 mm long device at 20 V forward-bias. This result can be expressed as a figure of merit of 5 dB/cm.V. The insertion loss of the device was estimated to be ~ 1:2 dB. The maximum switching speed of the devices was found to be ~1 MHz. Al-though this performance is inferior to the state-of-the-art silicon optical switches, it offers the first silicon-based electro-optical switch fabricated at low-temperatures with low insertion loss. Detailed analysis of the I-V and switching characteristics of the device revealed large series resistance and capacitance. It was also found that the switching speed is primarily governed by the RC time constant of the device rather than the minority carrier lifetime. This fact has led us to believe that the device functions as both injection and accumulation electro-absorption switch. A thin SiO2 layer is suspected to form at the ZnO/Si interface that facilitates the accumulation operation of the device and increases the RC time constant. The first low loss and low-temperature poly-silicon waveguides are demonstrated in this project. Hot-wire chemical vapour deposition (HWCVD) was used to deposit poly-silicon films at 240˚C. The propagation loss of the TE mode for a 600 by 220 nm waveguide was 13:5 dB/cm. Detailed simulation analysis revealed that at least 60% of the loss was caused by the roughness of the top surface of the waveguides. The RMS roughness was measured using atomic force microscopy (AFM) and was found to be 8:9 nm. Optimisation of the design, the deposition process, and the reduction of the top surface roughness, through surface planarisation, led to a reduction in the propagation loss of the TE mode to ~8:5 dB/cm while still maintaining low deposition temperature of 360˚C. The crystal volume fraction of the optimised poly-silicon film was found to be ~96%. An electro-optical switch based on ZnO and poly-silicon heterojunction was fabricated on a multi-layered poly silicon structure. However, there were problems with the metal contact pads as well as the thickness of the first poly-silicon layer. Future work will focus on improving the n-ZnO/p-Si heterojunction electro-optical performance by adapting an accumulation type structure as well as optimising the multi-layered poly-silicon platform.

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Książki na temat "Multi-physics processes"

Hu, Liangbo, Xiaoqiang Gu, Junliang Tao i Annan Zhou, red. Proceedings of GeoShanghai 2018 International Conference: Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0095-0.

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European, Mechanics of Materials Conference (3rd 1998 Oxford England). 3rd European Mechanics of Materials Conference on Mechanics and Multi-Physics Processes in Solids: Experiments, modelling, applications : EUROMECH-MECAMAT'98, Oxford, U.K., 23-25 November, 1998. Les Ulis, France: EDP Sciences, 1999.

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European Mechanics of Materials Conference (3rd 1998 Oxford, England). 3rd European Mechanics of Materials Conference on Mechanics and Multi-Physics Processes in Solids: Experiments, modelling, applications : EUROMECH-MECAMAT'98, Oxford, U.K., 23-25 November, 1998. Les Ulis, France: EDP Sciences, 1999.

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Sandro, Fuzzi, i Wagenbach Dietmar, red. Cloud multi-phase processes and high alpine air and snow chemistry: Ground-based cloud experiments and pollutant deposition in the high Alps. Berlin: Springer, 1997.

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Rieutord, Michel, Isabelle Baraffe i Yveline Lebreton. Multi-Dimensional Processes In Stellar Physics. EDP Sciences, 2020. http://dx.doi.org/10.1051/978-2-7598-2437-3.

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Baraffe, Isabelle, Yveline Lebreton i Michel Rieutord. Multi-Dimensional Processes in Stellar Physics: Evry Schatzman School 2018. EDP Sciences, 2021.

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Tao, Junliang, Xiaoqiang Gu i Liangbo Hu. Proceedings of GeoShanghai 2018 International Conference: Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing. Springer, 2018.

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Zhou, Annan, Junliang Tao, Xiaoqiang Gu i Liangbo Hu. Proceedings of GeoShanghai 2018 International Conference: Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing. Springer, 2019.

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Leubner, Manfred P., i Zoltán Vörös. Multi-scale Dynamical Processes in Space and Astrophysical Plasmas. Springer, 2012.

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Części książek na temat "Multi-physics processes"

Cross, M., K. McManus, S. P. Johnson, C. S. Ierotheou, C. Walshaw, C. Bailey i K. A. Pericleous. "Computational Modelling of Multi-Physics Processes on High Performance Parallel Computer Systems". W High-Performance Computing, 91–102. Boston, MA: Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4873-7_10.

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Shurina, E. P., N. B. Itkina, D. A. Arhipov, D. V. Dobrolubova, A. Yu Kutishcheva, S. I. Markov, N. V. Shtabel i E. I. Shtanko. "Multiscale Finite Element Technique for Mathematical Modelling of Multi-physics Processes in Heterogeneous Media". W Computational and Experimental Simulations in Engineering, 67–87. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-02097-1_6.

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Liu, Yan, Xiaojing Liu, Sijia Du, Jiageng Wang i Hui He. "Multi-Physics Coupling Model for Thermal Hydraulics and Solute Transport in CRUD Deposits". W Springer Proceedings in Physics, 396–411. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_35.

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AbstractThe porous Chalk River Unidentified Deposit (CRUD) depositions on the fuel cladding have a great impact on the heat transfer and power distribution of the reactor, resulting in a decrease in reactor safety and economy. In current paper, a multi-physics model is developed to simulate thermal hydraulics and boron hideout within the CRUD depositions. Processes including heat transfer, pressure drop, capillary flow, solute transport, chemical reactions and radiolysis reactions are fully coupled. The coolant flows through the capillary tubes in the porous medium and evaporates into steam at the surface of chimneys. The solute diffuses into the porous medium by capillary flow and maintains its chemical equilibrium. Chemistry and thermal hydraulics are coupled by saturation temperature that varies with solute concentrations. The new model can reasonably predict the distributions of temperature, pressure, Darcy velocity and chemical concentrations. This model shows the effect of evaporation at the chimney surface on CRUD temperature and boric acid concentration. In addition, the results show that boron hideout is caused by the accumulation of boric acid and the precipitation of Li2B4O7 at the bottom of CRUD. The influence of morphology parameters such as porosity, thickness, and chimney geometry on heat transfer and solute transport within CRUD depositions is also evaluated.

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Steinbach, Ingo, i Hesham Salama. "Tutorial 2: OpenPhase Examples". W Lectures on Phase Field, 103–13. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-21171-3_10.

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AbstractFor the purpose of numerically exploring different microstructure evolution processes, the phase-field approach has been developed. Large domains and adequate models that combine many physical fields in statistically relevant volume elements are needed to describe these complicated processes accurately. In order to facilitate such development for multi-physics simulations, OpenPhase was developed for application in material science and engineering. This chapter presents two examples simulated using the OpenPhase software, grain growth and dendritic solidification. The corresponding input files for OpenPhase are listed and explained. Also, some hints for postprocessing are given.

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Li, Yingyong, Hongbo Zhang, Xiuguang Song i Liang Lu. "Field Test of Multi-anchored-Plating Cantilever Retaining Wall with Pre-stressed Force". W Proceedings of GeoShanghai 2018 International Conference: Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing, 501–8. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0095-0_56.

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Elsworth, Derek, Kyunjae Im, Yi Fang, Takuya Ishibashi i Chaoyi Wang. "Induced Seismicity and Permeability Evolution in Gas Shales, CO2 Storage and Deep Geothermal Energy". W Proceedings of GeoShanghai 2018 International Conference: Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing, 1–20. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0095-0_1.

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Li, Lin, Xiong Zhang i Peng Li. "Soil Water Retention Surface Determination Using a New Triaxial Testing System". W Proceedings of GeoShanghai 2018 International Conference: Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing, 87–94. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0095-0_10.

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Zhou, Yue-feng, Bi-wei Gong, Jun Tong i Cong-an Li. "Comparative Study on the Stress-Dilatancy of Xinjiang Loess Under Saturated and Unsaturated Conditions". W Proceedings of GeoShanghai 2018 International Conference: Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing, 95–101. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0095-0_11.

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Su, Zheng, Xilin Lü, Jiangu Qian i Daokun Qi. "Finite Element Modeling of the Bearing Capacity for Transmission Tower Foundations on Expansive Soil". W Proceedings of GeoShanghai 2018 International Conference: Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing, 102–10. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0095-0_12.

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Sun, Xi, Jie Li, Annan Zhou i Hamayon Tokhi. "Climate Change Impacts on Reactive Soil Movements". W Proceedings of GeoShanghai 2018 International Conference: Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing, 111–19. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0095-0_13.

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Streszczenia konferencji na temat "Multi-physics processes"

Vick, Brian. "Multi-Physics Modeling of Tribological Processes Using Cellular Automata". W World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-63671.

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Tribology is in every sense of the word multidisciplinary. A multitude of different physical processes can occur simultaneously, often over widely varying time and length scales. The contact region between sliding bodies is a particularly interesting area, where thermal, mechanical, chemical, and electrical affects all play a role and interact in complex ways. Often our understanding of these phenomena is limited by the lack of a convenient methodology to model and solve such complex problems. The objective of this paper is to describe a new modeling and solution method that is relatively simple yet powerful enough to handle complex, multi-physics problems.

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Toshiyoshi, Hiroshi. "A Spice-based multi-physics simulation technique for integrated MEMS". W 2011 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD). IEEE, 2011. http://dx.doi.org/10.1109/sispad.2011.6035069.

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Muralidharan, Pradyumna, Stephen M. Goodnick i Dragica Vasileska. "Quasi 1D multi-physics modeling of silicon heterojunction solar cells". W 2018 International Conference on Simulation of Semiconductor Processes and Devices (SISPAD). IEEE, 2018. http://dx.doi.org/10.1109/sispad.2018.8551745.

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Kozlov, A. G., D. Randjelovic i Z. Djuric. "Analytical modelling of transient processes in thermal microsensors". W Multi-Physics Simulation and Experiments in Microelectronics and Microsystems (EuroSimE). IEEE, 2011. http://dx.doi.org/10.1109/esime.2011.5765841.

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Geiger, S. "Multi-scale - Multi-physics Modelling of IOR and EOR Processes in Fractured Carbonates". W First EAGE/SBGf Workshop 2013, Rio de Janeiro - Fractures in Conventional and Unconventional Reservoirs. Netherlands: EAGE Publications BV, 2013. http://dx.doi.org/10.3997/2214-4609.20131795.

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Doster, F. "Efficient multi-scale Multi-physics Modelling of Leakage Processes to Plan Monitoring Strategies". W First EAGE/SBGf Workshop on Reservoir Monitoring and its Role in the Energy Transition. European Association of Geoscientists & Engineers, 2022. http://dx.doi.org/10.3997/2214-4609.202287011.

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Chernogor, L. F., O. V. Lazorenko i A. A. Potapov. "Wavelet analysis of multi-fractal ultra-wideband processes in problems of geospace physics". W 2012 6th International Conference on Ultrawideband and Ultrashort Impulse Signals (UWBUSIS). IEEE, 2012. http://dx.doi.org/10.1109/uwbusis.2012.6379796.

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Wang, Yun, Sung Chan Cho i Partha P. Mukherjee. "Multi-Physics, Multi-Scale Modeling in Polymer Electrolyte Fuel Cells". W ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39208.

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In recent years, the polymer electrolyte fuel cell (PEFC) has emerged as a promising clean energy conversion device for various applications. One key research direction requiring significant breakthrough in order to alleviate performance limitations in PEFCs involves enhanced understanding of the coupled multi-physics transport phenomena and interfacial processes catering over multiple length scales in the constituent porous components. Multi-physics, multi-scale modeling is envisioned to hold the key toward enhanced understanding of the underlying structure-transport-performance interactions. In this article, a brief overview of several major aspects pertaining to the multi-physicochemical modeling of electrochemical reaction kinetics, species transport, two-phase heat and water transport, and phase change in the PEFC is presented.

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Yuan, Baoxin, Wankui Yang, Songbao Zhang, Bin Zhong, Junxia Wei i Yangjun Ying. "Numerical Simulation of Multi-Physics Processes in Nuclear System Based on Galerkin Finite Element Method". W 2020 International Conference on Nuclear Engineering collocated with the ASME 2020 Power Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icone2020-16801.

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Abstract It is of practical significance to analyze the multi-physics process of nuclear system, which includes neutronics, heat transfer and thermoelasticity. Fission reaction is the heat source in system, the heat source will affect the distribution of temperature field, which will lead to the change of strain. Strain in turn will affect the distribution of neutron field. Therefore, it is necessary to analyze the distribution of neutron flux, temperature and strain in system. Three aspects of work have been carried out: 1) Based on Galerkin finite element theory, the governing equations of neutronics, heat transfer and thermoelasticity are established; 2) The multi-physics analysis code is developed; 3) The calculation results are analyzed and discussed.

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Mencarelli, D., M. Stocchi i L. Pierantoni. "A multi-physics approach for the analysis and design of optomechanical cavities". W 2017 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP). IEEE, 2017. http://dx.doi.org/10.1109/imws-amp.2017.8247335.

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Raporty organizacyjne na temat "Multi-physics processes"

Pochiraju, Kishore V. Multi-Physics Modeling and Simulation of Process-Induced Stresses in Polymer-Matrix Composites. Fort Belvoir, VA: Defense Technical Information Center, czerwiec 2002. http://dx.doi.org/10.21236/ada418111.

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Chapman i Toema. PR-266-09211-R01 Physics-Based Characterization of Lambda Sensor from Natural Gas Fueled Engines. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), listopad 2012. http://dx.doi.org/10.55274/r0010022.

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The increasingly strict air emission regulations may require implementing Non-Selective Catalytic Reduction (NSCR) systems as a promising emission control technology for stationary rich burn spark ignition engines. Many recent experimental investigations that used NSCR systems for stationary natural gas fueled engines showed that NSCR systems were unable to consistently control the exhaust emissions level below the compliance limits. Modeling of NSCR components to better understand, and then exploit, the underlying physical processes that occur in the lambda sensor and the catalyst media is now considered an essential step toward improving NSCR system performance. This report focuses on modeling the lambda sensor that provides feedback to the air-to-fuel ratio controller. Correct interpretation of the sensor output signal is necessary to achieve consistently low emissions level. The goal of this modeling study is to improve the understanding of the physical processes that occur within the sensor, investigate the cross-sensitivity of various exhaust gas species on the sensor performance, and finally this model serves as a tool to improve NSCR control strategies. This model simulates the output from a planar switch type lambda sensor. The model consists of three modules. The first module models the multi-component mass transport through the sensor protective layer. The second module includes all the surface catalytic reactions that take place on the sensor platinum electrodes. The third module is responsible for simulating the reactions that occur on the electrolyte material and determine the sensor output voltage.

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