Bibliografías temáticas / Materials – Effect of radiation on – Computer simulation

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Literatura académica sobre el tema "Materials – Effect of radiation on – Computer simulation"

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Publicado: 4 de junio de 2021
Última modificación: 1 de febrero de 2022

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Artículos de revistas sobre el tema "Materials – Effect of radiation on – Computer simulation"

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Nordlund, K. "Historical review of computer simulation of radiation effects in materials". Journal of Nuclear Materials 520 (julio de 2019): 273–95. http://dx.doi.org/10.1016/j.jnucmat.2019.04.028.

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Darambara, D. G., A. N. Papadopoulos y N. M. Spyrou. "Computer simulation of positron-induced radiation effects in Dynamic RAMs". Radiation Effects and Defects in Solids 141, n.º 1-4 (junio de 1997): 141–48. http://dx.doi.org/10.1080/10420159708211565.

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Turichin, Gleb A., Ekaterina A. Valdaytseva, Stanislav L. Stankevich y Ilya N. Udin. "Computer Simulation of Hydrodynamic and Thermal Processes in DLD Technology". Materials 14, n.º 15 (25 de julio de 2021): 4141. http://dx.doi.org/10.3390/ma14154141.

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This article deals with the theoretical issues of the formation of a melt pool during the process of direct laser deposition. The shape and size of the pool depends on many parameters, such as the speed and power of the process, the optical and physical properties of the material, and the powder consumption. On the other hand, the influence of the physical processes occurring in the material on one another is significant: for instance, the heating of the powder and the substrate by laser radiation, or the formation of the free surface of the melt, taking into account the Marangoni effect. This paper proposes a model for determining the size of the melt bath, developed in a one-dimensional approximation of the boundary layer flow. The dimensions and profile of the surface and bottom of the melt pool are obtained by solving the problem of convective heat transfer. The influence of the residual temperature from the previous track, as well as the heat from the heated powder of the gas–powder jet, taking into account its spatial distribution, is considered. The simulation of the size and shape of the melt pool, as well as its free surface profile for different alloys, is performed with 316 L steel, Inconel 718 nickel alloy, and VT6 titanium alloy
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Vaz Sá, Ana, Miguel Azenha, A. S. Guimarães y J. M. P. Q. Delgado. "FEM Applied to Building Physics: Modeling Solar Radiation and Heat Transfer of PCM Enhanced Test Cells". Energies 13, n.º 9 (2 de mayo de 2020): 2200. http://dx.doi.org/10.3390/en13092200.

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In passive solar buildings, energy can be stored using either sensible heat materials or latent heat materials. Phase change materials (PCM) can contribute to temperature control in passive solar buildings when melting occurs near to comfort temperature required for building’s interior spaces. The use of finite element method (FEM) as a numerical methodology for solving the thermal problem associated with heat transfer in current building materials and PCMs make sense, as it is a well-known technique, generalized and dominated, however, still little applied to the domain of building physics. In this work, a solar model was developed and applied in order to simulate numerically the effect of solar radiation incidence on each face of the test cells (with different solar exposures) without neglecting the main objective of the recommended numerical simulation: the study of the action of PCM. During the experimental campaign, two test cells with distinct inner layers were used to evaluate the effect of solar radiation: (i) REFM test cell (without PCM) with a reference mortar; (ii) PCMM test cell (with PCM) with a PCM mortar. The temperatures monitored inside the REFM and PCMM test cells were compared with the values resulting from the numerical simulation, using FEM with 3D discretization and the explicit modeling of the solar radiation, and the obtained results revealed a significant coherence of values.
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Scarfone, L. M. y J. D. Chlipala. "Computer simulation of target link explosion in laser programmable redundancy for silicon memory". Journal of Materials Research 1, n.º 2 (abril de 1986): 368–81. http://dx.doi.org/10.1557/jmr.1986.0368.

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Pulses of Q-switched Nd-YAG radiation have been used to remove polysilicon target links during the implementation of laser programmable redundancy in the fabrication of silicon memory. The link is encapsulated by transparent dielectric films that give rise to important optical interference effects modifying the laser flux absorbed by the link and the silicon substrate. Estimates of these effects are made on the basis of classical plane-wave procedures. Thermal evolution of the composite structure is described in terms of a finite-difference form of the three-dimensional heat diffusion equation with a heat generation rate having a Gaussian spatial distribution of intensity and temporal shapes characteristic of commercial lasers. Temperature-dependent thermal diffusivity and melting of the polysilicon link are included in the computer modeling. The calculations account for the discontinuous change in the link absorption coefficient at the transition temperature. A threshold temperature and corresponding pressure, sufficiently high to rupture the dielectric above the link and initiate the removal process, are estimated by treating the molten link as a hard-sphere fluid. Numerical results are presented in the form of three-dimensional temperature distributions for 1.06 and 0.53 μm radiation with pulse energies 3.5 and 0.15μJ, respectively. Similarities and differences between heating effects produced by long (190 ns FWHM/740 ns duration) and short (35 ns FWHM/220 ns duration) pulses are pointed out.
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Bacon, D. J., A. F. Calder y F. Gao. "Computer simulation of displacement cascade effects in metals". Radiation Effects and Defects in Solids 141, n.º 1-4 (junio de 1997): 283–310. http://dx.doi.org/10.1080/10420159708211577.

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Parks, Joseph W., Kevin F. Brennan y Arlynn W. Smith. "Numerical Examination of Photon Recycling as an Explanation of Observed Carrier Lifetime in Direct Bandgap Materials". VLSI Design 8, n.º 1-4 (1 de enero de 1998): 153–57. http://dx.doi.org/10.1155/1998/16476.

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Photon recycling is examined as an explanation for the observed large carrier lifetimes in an InP/InGaAs photodiode. This effect extends the effective carrier lifetime within a device by re-absorbing a fraction of the photons generated through radiative band-toband recombination events. In order to predict the behavior of this carrier generation, photon recycling has been added to our two-dimensional macroscopic device simulator, STEBS-2D. A ray-tracing preprocessing step is used to map all of the possible trajectories and absorption of various wavelengths of emitted light from each originating node within the device. The macroscopic simulator uses these data to determine the spatial location of the re-absorbed radiation within the geometry of the device. By incorporating the ray tracer results with the total quantity and spectral content of recombined carriers at each node within the simulation, the recycled generation rate can be obtained. A practical application of this model is presented where the effects of photon recycling are used as a possible explanation of the discrepancy between the theoretically predicted and experimentally observed radiative recombination rate in a double heterostructure photodetector.
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de la Rubia, T. Diaz, M. W. Guinan, A. Caro y P. Scherrer. "Radiation effects in FCC metals and intermetallic compounds: A molecular dynamics computer simulation study". Radiation Effects and Defects in Solids ll, n.º 1 (julio de 1994): 39–54. http://dx.doi.org/10.1080/10420159408219769.

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Luminosu, Ioan, Sabata De y Sabata De. "Research in solar energy at the 'Politehnica' university of Timisoara: Studies on solar radiation and solar collectors". Thermal Science 14, n.º 1 (2010): 157–69. http://dx.doi.org/10.2298/tsci1001157l.

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A short overview of a more than 30 years long history and results of research and thermal applications of solar energy at the 'Politehnica' University of Timisoara, Romania, are presented. The main directions approached are: actinometry, studies on materials and greenhouse effect, thermal collectors, industrial and home thermal applications, computer simulation of physical phenomena, and concentrators. This paper focuses on the conception and building of a dedicated laboratory and on the experimental results that allowed the development of industrial and home applications.
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Miroshnichenko, Igor V. y M. A. Sheremet. "Numerical simulation of turbulent natural convection combined with surface thermal radiation in a square cavity". International Journal of Numerical Methods for Heat & Fluid Flow 25, n.º 7 (7 de septiembre de 2015): 1600–1618. http://dx.doi.org/10.1108/hff-09-2014-0289.

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Purpose – The purpose of this paper is to present transient turbulent natural convection with surface thermal radiation in a square differentially heated enclosure using non-primitive variables like stream function and vorticity. Design/methodology/approach – The governing equations formulated in dimensionless variables “stream function, vorticity and temperature,” within the Boussinesq approach taking into account the standard two equation k-ε turbulence model with physical boundary conditions have been solved using an iterative implicit finite-difference method. Findings – It has been found that using of the presented algebraic transformation of the mesh allows to effectively conduct numerical analysis of turbulent natural convection with thermal surface radiation. It has been shown that the average convective Nusselt number increases with the Rayleigh number and decreases with the surface emissivity, while the average radiative Nusselt number is an increasing function of these key parameters. It has been shown that a presence of surface thermal radiation effect leads to an expansion of the eddy viscosity zones close to the walls. Originality/value – It should be noted that for the first time in this paper we used stream function and vorticity variables with very effective algebraic transformation of the mesh in order to create a non-uniform mesh for an analysis of turbulent flow. Such method allows to reduce the computational time essentially in comparison with using of the primitive variables. The considered method has been successfully validated on the basis of the experimental and numerical data of other authors in case of turbulent natural convection without thermal radiation. The used numerical method would benefit scientists and engineers to become familiar with the analysis of turbulent convective heat and mass transfer, and the way to predict the properties of the turbulent flow in advanced nuclear systems, in industrial sectors including transportation, power generation, chemical sectors, ventilation, air-conditioning, etc.
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Tesis sobre el tema "Materials – Effect of radiation on – Computer simulation"

1

Davis, Kenneth Ralph 1964. "Two-dimensional simulation of the effects of total dose ionizing radiation on power-MOSFET breakdown". Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277053.

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The effects of ionizing radiation on the breakdown-voltage degradation of power-MOSFET termination structures were examined through two-dimensional simulation. A wide variety of sensitivity to surface-charge density was found for various devices employing floating field rings and/or equipotential field plates. Termination structures that were both insensitive to surface charge and possessed a high breakdown voltage were identified. The results were compared with measurements made on selected structures. The principal ionizing radiation damaging mechanisms in MOS devices are discussed. Modifications made to an existing simulation program in order to simulate these complex field ring and field plate structures are described. Background information into how these termination structures improve the breakdown voltage and their sensitivities to positive interface charge buildup is investigated.
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2

Ramasawmy, Deerajen. "Computer simulation of sputtering and radiation damage in ionic materials". Thesis, Loughborough University, 2004. https://dspace.lboro.ac.uk/2134/12701.

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Ghassemi, Hamed 1964. "Design and simulation of an improved operational amplifier for use in radiation environments". Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/276987.

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The effects of radiation on an operational amplifier were investigated through simulation. The μA 741 was simulated using Spice. Under normal conditions the 741 had the following properties: offset Voltage (Vos) of 0.8 mV, bias current (IB) of 27 nA, offset current (Ios) of 1 nA, and an open loop gain (A0.1.) of 112 dB. When exposed to neutron fluence of 5 x 10¹³ n/cm², these parameters changed to offset voltage of 45 mV, bias current of 1500 nA, offset current of 500 nA, and an open loop gain of 66 dB. A new circuit is proposed that provides improvements in the above parameters. The modified circuit gives a Vos of 3 mV, IB of 200 nA, Ios of 34 nA and A0.1. of 93 dB following exposure to a neutron fluence of 5 x 10¹³n/cm².
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Rangaswamy, Mukundhan. "Computer simulation of high fluence ion beam surface modification processes". Diss., Virginia Polytechnic Institute and State University, 1989. http://hdl.handle.net/10919/54269.

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Various processes that participate in ion beam surface modification are studied using phenomenological, analytical and first principle models. The processes that are modelled phenomenologically include preferential sputtering, radiation-damage induced migration and second phase precipitation. The models are based on numerical solutions of the transport equation and include the processes of ion collection, sputtering, lattice dilation or accommodation and diffusion as well. The model for preferential sputtering takes into account the depletion of the preferentially sputtered element at the surface and the atomic transport process that results from the concentration gradients caused by the depletion. Results are presented for the case of Ta implantation into Fe. ln the radiation-damage induced migration the flux of the solute atoms is coupled to the concentration gradient of the continuously introduced defects. Examples of implantation of Sn into Fe and N into Fe are modeled to demonstrate the influence of radiation-damage induced migration. The precipitation of second phases during irradiation is modelled using thermodynamic considerations but with solubility values under irradiation obtained from experiment. In the model the solute atoms in excess of the solubility limit are assumed to precipitate out. Calculations are presented for the case of N implantation into Nb. Using first principle calculation for binary collisions in solids a computer simulation code was developed to study the collisional mixing occurring during high fluence ion implantation. It is based on the Monte Carlo code TRIM, and is capable of updating the target composition as the implantation process proceeds to high fluences. The physical basis for the dynamic simulation as well as a detailed analysis on the statistics required for obtaining the profiles with a given accuracy are presented. Vectorized results in a high computational efficiency. The predicted collisional broadening of the implantation profiles is presented for Ar bombardment into a Sn-Fe target as well as Ti implantation into C-Fe. The results are compared to those of the diffusion approximation. A semi-empiricaI model based on an analytical evaluation of ion mixing at low temperatures was developed taking into account collisional mixing and thermal spike effects, as well as the thermal spike shape. The ion beam mixing parameter for the thermal spike is derived as being proportional to different powers of the damage parameter, i.e. the damage energy scaled by the cohesive energy of the matrix, dependent on the thermal spike shape and point defect density in the thermal spike regions. Three different regions of ion beam induced mixing were recognized according to different density levels of the damage parameter. An experiment was conducted to determine the effect of chemical or thermodynamic factors in the migration of C in the presence of Fe and Ti atoms. A marker layer of C in a Fe-Ti matrix was ion beam mixed using Ar. The large mixing effect is tentatively attributed to a favorable heat of mixing values.
Ph. D.
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Tiwari, Gopal. "Computer simulation of radio frequency (RF) heating in dry food materials and quality evaluation of RF treated persimmons". Pullman, Wash. : Washington State University, 2010. http://www.dissertations.wsu.edu/Dissertations/Spring2010/g_tiwari_041910.pdf.

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Webber, Kyle Grant. "Effect of Domain Wall Motion and Phase Transformations on Nonlinear Hysteretic Constitutive Behavior in Ferroelectric Materials". Diss., Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22695.

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The primary focus of this research is to investigate the non-linear behavior of single crystal and polycrystalline relaxor ferroelectric PMN-xPT and PZN-xPT through experimentation and modeling. Characterization of single crystal and polycrystalline specimens with similar compositions was performed. These data give experimental insight into the differences that may arise in a polycrystal due to local interaction with inhomogeneities. Single crystal specimens were characterized with a novel experimental technique that reduced clamping effects at the boundary and gave repeatable results. The measured experimental data was used in conjunction with electromechanical characterizations of other compositions of single crystal specimens with the same crystallographic orientation to study the compositional effects on material properties and phase transition behavior. Experimental characterization provided the basis for the development of a model of the continuous phase transformation behavior seen in PMN-xPT single crystals. In the modeling it is assumed that a spatial chemical and structural heterogeneity is primarily responsible for the gradual phase transformation behavior observed in relaxor ferroelectric materials. The results are used to simulate the effects of combined electrical and mechanical loading. An improved rate-independent micromechanical constitutive model based on the experimental observations of single crystal and polycrystalline specimens under large field loading is also presented. This model accounts for the non-linear evolution of variant volume fractions. The micromechanical model was calibrated using single crystal data. Simulations of the electromechanical behavior of polycrystalline ferroelectric materials are presented. These results illustrate the effects of non-linear single crystal behavior on the macroscopic constitutive behavior of polycrystals.
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Getley, Ian L. Department of Aviation Faculty of Science UNSW. "Cosmic and solar radiation monitoring of Australian commercial flight crew at high southern latitudes as measured and compared to predictive computer modelling". Awarded by:University of New South Wales, 2007. http://handle.unsw.edu.au/1959.4/40536.

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This study set out to examine the levels of galactic cosmic radiation exposure to Australian aircrew during routine flight operations, with particular attention to the high southern latitude flights between Australia and South Africa. Latitudes as high as 65?? South were flown to gain the data and are typical of the normal flight routes flown between Sydney and Johannesburg on a daily basis. In achieving this objective it became evident that suitable commercially available radiation monitoring equipment was not readily available and scientific radiation monitors were sourced from overseas research facilities to compliment my own FH4lB and Liulin monitors provided by UNSW. At the same time it became apparent that several predictive codes had been developed to attempt to model the radiation doses received by aircrew based on flight route, latitudes and altitudes. Further, it became apparent that these codes had not been subjected to verification at high southern latitudes and that they had not been validated for the effects of solar particle events. Initially measurements were required at the high latitudes followed by mid-latitude data to further balance the PCAIRE code to ensure reasonableness of results for both equatorial and high latitudes. Whilst undertaking this study new scientific monitors became available which provided an opportunity to observe comparative data and results. The Liulin, QDOS and a number of smaller personal dosimeters were subsequently obtained and evaluated. This appears to be the first time that such an extensive cross comparison of these monitors has been conducted over such a wide range of latitudes and altitudes. During the course of this study a fortuitous encounter with GLE 66 enabled several aspects of code validation to be examined, namely the inability of predictive codes to estimate the increased dose associated with a GLE or the effects of a Forbush decrease on the code results. Finally I review the known biological effects as discussed by numerous authors based on current epidemiological studies, with a view to high-lighting were the advent of future technology in aviation may project aircrew dose levels.
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Le, Corre Benjamin. "Thermoformage du verre - Développement numérique d'un modèle thermomécanique". Phd thesis, Université de Lorraine, 2014. http://tel.archives-ouvertes.fr/tel-00975511.

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Ce travail de thèse est dédié à la modélisation du thermoformage du verre. Le procédé consiste à déformer une plaque de verre sous l'effet de son propre poids. Posée sur un support et placée dans un four, la température de la pièce augmente et sa viscosité diminue, ce qui permet d'obtenir la forme désirée. Les simulations numériques, qui se basent sur un modèle thermomécanique, doivent permettre de mieux comprendre l'influence, sur le produit final, des différents paramètres d'essai, comme le chargement thermique, la géométrie et le matériau du moule ou encore la forme initiale de la pièce. Pour ce faire, le logiciel commercial Abaqus®, qui utilise une méthode de résolution des calculs par éléments finis, prend en charge les aspects mécaniques et conductifs. En revanche, comme le verre est un milieu semi-transparent, la modélisation du transfert radiatif est complexe et nécessite le développement d'un code se basant sur une méthode de Monte Carlo dite réciproque. La méthode a été validée en deux dimensions sur des cas-tests de la littérature scientifique. Le code a ensuite été implémenté dans le logiciel Abaqus® afin de réaliser des simulations de thermoformage sur moule et en suspension. Le verre est considéré comme un matériau élasto-visco-plastique obéissant à un modèle de Maxwell simple et la thermodépendance de la viscosité est prise en compte par une loi WLF. Une attention particulière a été accordée au modèle radiatif. Différentes hypothèses, issues de la littérature scientifique, sont testées afin de vérifier leur validité dans notre cas d'étude.
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Pignol, Valérie. "Évolution et caractérisation de structures cellulaires bidimensionnelles expérimentales, en particulier les mousses de savon, et simulées". Phd thesis, Institut National Polytechnique de Lorraine - INPL, 1996. http://tel.archives-ouvertes.fr/tel-00717860.

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Ce travail est consacré à l'étude de structures cellulaires bidimensionnelles et notamment à leur évolution au cours du temps. Après une phase transitoire (dont la durée dépend de l'ordre initial de la structure) l'évolution atteint généralement un régime stationnaire (où l'aire moyenne des cellules varie linéairement avec le temps et où les propriétés sans dimension, telles que le désordre topologique et la distribution des nombres de côtés des cellules, sont invariantes). Une méthodologie d'analyse d'images a été mise au point pour caractériser les structures à un instant donné. Leurs propriétés métriques et topologiques sont déterminées en tenant compte d'une correction de biais statistique. Nous avons réalisé des expériences portant sur des mousses de savon bidimensionnelles (réalisées entre deux plaques). Un système de drainage a également été mis en place dans le but de conserver l'épaisseur des arêtes constante au cours de l'évolution. Lorsque l'état initial de la structure est très ordonné, le stade transitoire est très long, ce qui limite notre étude à cette seule phase de l'évolution. En revanche, nous avons pû étudier le régime stationnaire en partant de structures initiales désordonnées et en particulier déterminer la valeur du désordre topologique dans cette phase. Cette valeur semble dépendre de la composition du liquide moussant, de la taille de la boîte contenant la mousse, mais apparemment pas du drainage. Des simulations ont été effectuées à l'aide d'un programme développé par H. Telley à l'EPFL. Ce programme est fondé sur l'utilisation des complexes de Laguerre bidimensionnels et périodiques. Ces simulations ont fourni des résultats comparables à ceux observés pour les mousses, mais également pour les polycristaux, grâce à l'ajustement d'un paramètre distributif. Celui-ci est relié de façon simple aux transformations topologiques élémentaires intervenant au cours de l'évolution. La validation du programme a été effectuée non seulement pour le régime stationnaire mais aussi pour le régime transitoire (pour les mousses de savon)
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Bostick, Kent C. "Two-dimensional temperature model for target materials bombarded by ion beams". Thesis, 1992. http://hdl.handle.net/1957/37236.

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The ion implantation process is a very precise, controllable, and reproducible method used to enhance material properties of finished components such as ball bearings. Essentially, the target material is bombarded by accelerated ions to form a thin alloyed layer in the substrate. As the ions deposit their kinetic energy in the target it begins to heat up. To prevent thermal distortion in the finished pieces the ion implantation is performed at dose levels (dependent on the ion fluence and time duration of implantation) to insure that the target pieces stay at relatively low temperatures. Consequently, the low temperature requirement for many applications limits the economic, and probably, the physical success of ion implantation. The purpose of this study was to show the applicability of using a two-dimensional computer code developed to model plasma disruptions and subsequent energy deposition on a fusion reactor first wall to calculate surface and bulk temperature information during ion implantation. In turn the code may assist researchers pursuing development of adequate cooling for target materials in an attempt to overcome the low temperature constraint. All data supported the hypotheses that the two-dimensional code previously developed for fusion reactor applications was adequate to model the ion implantation process.
Graduation date: 1992
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Libros sobre el tema "Materials – Effect of radiation on – Computer simulation"

1

Eckstein, Wolfgang. Computer simulation of ion-solid interactions. Berlin: Springer-Verlag, 1991.

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Eckstein, Wolfgang. Computer Simulation of Ion-Solid Interactions. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991.

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Baranoski, Gladimir Valerio Guimarães. Light & skin interactions: Simulations for computer graphics applications. Burlington, MA: Morgan Kaufmann Publishers, 2010.

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Aravind, Krishnaswamy, ed. Light and skin interactions: Simulations for computer graphics applications. Burlington, MA: Morgan Kaufmann Publishers, 2010.

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Burch, D. M. MOIST, a PC program for predicting heat and moisture transfer in building envelopes. 2a ed. [Gaithersburg, Md.?]: U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology, 1993.

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International Symposium on Explosion, Shock Wave and Hypervelocity Phenomena (2nd 2007 Kumamoto, Japan). Explosion, shock wave and hypervelocity phenomena in materials II: Selected peer reviewed papers from the 2nd International Symposium on Explosion, Shock Wave and Hypervelocity Phenomena (ESHP-2), 6-9 March 2007, Kumamoto, Japan. Stafa-Zurich, Switzerland: Trans Tech Publications, 2008.

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Bostick, Kent C. Two-dimensional temperature model for target materials bombarded by ion beams. 1992.

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Bostick, Kent C. Two-dimensional temperature model for target materials bombarded by ion beams. 1992.

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A, Striepe Scott, Simonsen Lisa C y United States. National Aeronautics and Space Administration. Scientific and Technical Information Program., eds. MIRACAL: A mission radiation calculation program for analysis of lunar and interplanetary missions. [Washington, DC]: National Aeronautics and Space Administration, Office of Management, Scientific and Technical Information Program, 1992.

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Fuller, James J. Predicting the thermo-mechanical behavior of a gypsum-to-wood nailed connection. 1990.

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Capítulos de libros sobre el tema "Materials – Effect of radiation on – Computer simulation"

1

Vaks, V. G. "Effect of Specific Features of Electronic Structure on Elastic and Structural Properties of Metals and Alloys". En Computer Simulation in Materials Science, 423–36. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3546-7_22.

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Kotomin, E. A. "Semi-Empirical Simulation of Radiation Defects in Oxide Materials". En Computer Modelling of Electronic and Atomic Processes in Solids, 51–59. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5662-2_5.

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Nieminen, Risto M. "COMPUTER SIMULATION OF RADIATION DAMAGE IN AMORPHOUS SOLIDS". En Computer Aided Innovation of New Materials, 359–64. Elsevier, 1991. http://dx.doi.org/10.1016/b978-0-444-88864-8.50078-9.

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SOE, We-Hyo, Akira YAMAGUCHI y Ryoichi YAMAMOTO. "COMPUTER SIMULATION OF MAGNETO-OPTICAL KERR EFFECT OF MULTILAYERED FILMS". En Computer Aided Innovation of New Materials, 233–36. Elsevier, 1991. http://dx.doi.org/10.1016/b978-0-444-88864-8.50052-2.

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Sone, Yuki, Masataka Satoh y Yasuhiro Yamamoto. "Computer simulation of deformed scanning wave effect on dose distribution in ion implantation". En Ion Beam Modification of Materials, 1123–26. Elsevier, 1996. http://dx.doi.org/10.1016/b978-0-444-82334-2.50229-x.

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WEI, C., R. G. QIAN, S. LIN y J. M. XIAO. "COMPUTER SIMULATION OF THE EFFECT OF GRAIN SIZE ON THE PROPERTIES OF POLYCRYSTALLINE SPECIMENS BY FINITE ELEMENT METHOD". En Mechanical Behaviour of Materials VI, 153–58. Elsevier, 1992. http://dx.doi.org/10.1016/b978-0-08-037890-9.50032-6.

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Rizwan, M. "Simulation Models for Solar Photovoltaic Materials". En Materials Research Foundations, 114–33. Materials Research Forum LLC, 2021. http://dx.doi.org/10.21741/9781644901410-5.

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Semiconducting materials have dominated the photovoltaic industry for a long time. The advancement in solar cell technology is significantly influenced by computer modelling, designing and simulations of the semiconductor materials used for the device operation. Different modelling techniques including one, two and three dimensional models had been employed to comprehend the device operation of solar cell and other electronic devices based on semiconductor materials such as silicon and gallium arsenide. The performance of computing power is increasing with the passage of time in order to improve modelling and designing of different semiconductor materials for solar cell devices. In this chapter, different reported semiconductor materials, their standard characteristics and basic history of modelling, standard models used in photovoltaic industry and principles of modelling such as carrier statistics, transitions, band structure and mobility are explained in detail. Different characteristics of semiconductor material like the carrier transportation, carrier statistics, band structure, and heavy doping effect and carrier generations are described with respect to material modelling.
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Wasim, Muhammad, Fauzan Saeed, Abdul Aziz y Adnan Ahmed Siddiqui. "Dotted Raster-Stereography". En Advanced Methodologies and Technologies in Artificial Intelligence, Computer Simulation, and Human-Computer Interaction, 93–109. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-7368-5.ch008.

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Raster-stereography is a 3D surface topography technique that provides height and curvature information of the subject. This is a non-contact, non-invasive, and radiation-free technique that is mostly used to analyze the back shape of a human body. The most practical aspect of raster-stereography is ease in its apparatus setup and reduced exposure to x-rays. Another very important and effective application is to identify the human faces that can be used in security domain. The problem of breaking lines was observed while traversing the distorted raster pattern on the human body. These breaks in raster pattern increased significantly when projected on the face. Computationally, it becomes difficult to extract all valid curvatures of the human face. This problem was resolved using a modified dotted raster, and the noise effect was reduced substantially. The dotted raster technique proved that it is by far the best option when compared with the conventional line grid.
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Actas de conferencias sobre el tema "Materials – Effect of radiation on – Computer simulation"

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Glaspell, Aspen, Jae Joong Ryu y Kyosung Choo. "Thermo-Mechanical Simulation of Ti6Al4V-NiTi Dissimilar Laser Welding Process". En ASME 2021 16th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/msec2021-58537.

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Abstract Fiber Laser Welding (FLW) is a versatile joining technique of metals and alloys because it allows welding of dissimilar materials without filler material. FLW utilizes intensified heat energy to liquify the workpiece interface and joins when they are solidified. In this study, dissimilar joining between Ti6Al4V-Nitinol was performed using FLW process and the thermomechanical model was developed to understand the metallurgical mechanisms and investigate weldability of dissimilar alloys. The FLW of Ti6Al4V and Nitinol plates was performed with variable power density, welding speed, and focal distance. In this three-dimensional numerical model, heat flows in two different workpieces were computed during active laser welding and cooling process using a combined effect of radiation and convection. Both of the top and bottom surfaces of the welded zone were studied considering the combined effect from focused heat source and Argon shielding gas. Significant thermal cracks were produced through the welded interface. However, this numerical study illustrated thermomechanical foundation and discuss future challenges to improve the integrity and desirable FLW parameters in the dissimilar metal joining.
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Feng, Zhili y Gery Wilkowski. "Repair Welding of Irradiated Materials: Modeling of Helium Bubble Distributions for Determining Crack-Free Welding Procedures". En 10th International Conference on Nuclear Engineering. ASMEDC, 2002. http://dx.doi.org/10.1115/icone10-22660.

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In this paper, a computational simulation study is presented on the prediction of helium bubble evolution during repair welding of irradiated 304 stainless steel. Realistic spatial and temporal temperature and stress evolution during welding were obtained from simulation of the repair welding operation using the finite element model approach. The helium bubble evolution model by Kawano et al. was adopted as a user subroutine in the finite element model to predict the spatial distribution and temporal evolution of the helium bubble size and density in the heat-affected zone (HAZ) of partial penetration welds. Comparisons with experimental results available in open literature show that the predicted average helium bubble sizes were consistent with those observed experimentally under similar conditions. In addition, the computer simulation revealed strong spatial variation of helium bubble size due to the differences in combined thermal and stress conditions experienced in different locations in the HAZ. The predicted location of the maximum helium bubble agreed well with the observed helium-induced cracking site. The effect of welding heat input and welding speed was also investigated numerically. The modeling approach adopted in this study could be used as a cost-effective tool to quantitatively correlate the welding condition, radiation damage, and the likelihood of cracking, under the influence of welding-induced thermal and stress cycles. The model will also be useful in studying the degradation of properties from helium bubble formation of post-welded structures, even if a successful weld is made.
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Pandi, Parthasarathy y Patrick Le Clercq. "Numerical Simulation of Heat Transfer in a 3D Cavity-Receiver". En ASME 2015 9th International Conference on Energy Sustainability collocated with the ASME 2015 Power Conference, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/es2015-49355.

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The unsteady 3D fluid flow coupled to radiative, convective, and conductive heat transfers are computed within a cavity-receiver that was successfully tested experimentally. A Monte-Carlo radiation model is used in the fluid regions of the reactor with source terms outside the cavity’s window to account for the concentrated radiative power input. Darcy’s law for the viscous regime and the Forchheimer’s term for the inertial regime are used in the momentum equation to account for the pressure drop within the porous region (RPC). Two separate energy equations for the solid and for the fluid regions of the porous domain are solved in order to capture the non-equilibrium effects in that region. Rosseland diffusion approximation is used in the solid regions of the RPC domain. The material properties and boundary conditions were taken from published experimental measurements. The simulation results are compared to the measurement data collected during the pre-heating and the ceria reduction phases, which sum up to four different radiative power inputs. Results of the comparison are very good and constitute the verification that the numerical methods, physical sub-process models and material properties are adequately selected and implemented. An analysis regarding the heat balance, the recirculating flow and, the effect of dual-scale porosity is also presented.
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Kolbun, Natallia V., Timophey V. Borbotko, Alexandr A. Kazeka, Alexander M. Proudnik y Leanid M. Lynkou. "Simulation of electromagnetic radiation passing through liquid-containing nanostructured materials". En Nano-Design, Technology, Computer Simulations, editado por Alexander I. Melker y Vladislav V. Nelayev. SPIE, 2008. http://dx.doi.org/10.1117/12.836443.

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Ashurova, Kamilla, Maxim Vorobyov y Tamara Koval. "Numerical Simulation of the Effect of an Electron Beam on the Surface of Materials". En 2020 7th International Congress on Energy Fluxes and Radiation Effects (EFRE). IEEE, 2020. http://dx.doi.org/10.1109/efre47760.2020.9242112.

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Lu, Xijia y Ting Wang. "Effect of Radiation Models on Coal Gasification Simulation". En ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86997.

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Adequate modeling of radiation heat transfer is important in CFD simulation of coal gasification process. In an entrained-flow gasifer, the non-participating effect of coal particles, soot, ashes, and reactive gases could significantly affect the temperature distribution in the gasifier and hence affects the local reaction rate and life expectancy of wall materials. For slagging type gasifiers, radiation further affects the forming process of corrosive slag on the wall which can expedite degradation of the refractory lining in the gasifier. For these reasons, this paper focuses on investigating applications of five different radiation models to coal gasification process, including Discrete Transfer Radiation Model (DTRM), P-1 Radiation Model, Rosseland Radiation Model, Surface-to-Surface (S2S) Radiation Model, and Discrete Ordinates (DO) Radiation Model. The objective is to identify the pros and cons of each model’s applicability to the gasification process and determine which radiation model is most appropriate for simulating the process in entrained-flow gasifiers. The Eulerian-Lagrangian approach is applied to solve the Navier-Stokes equations, nine species transport equations, and seven global reactions consisting of three heterogeneous reactions and four homogeneous reactions. The coal particles are tracked with the Lagrangian method. Six cases are studied—one without the radiation model and the other five with different radiation models. The result reveals that the various radiation models yield uncomfortably large uncertainties in predicting syngas composition, syngas temperature, and wall temperature. The Rosseland model does not yield reasonable and realistic results for gasification process. The DTRM model predicts very high syngas and wall temperatures in the dry coal feed case. In the one-stage coal slurry case, DTRM result is close to the S2S result. The P1 method seems to behave stably and is robust in predicting the syngas temperature and composition; it yields the result most close to the mean, but it seems to underpredict the gasifier’s inner wall temperature.
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Hu, Songtao, Feng Qi, Teng Xie, Xinxin Wang y Gang Wang. "Numerical Simulation Study of the Influence of Ceiling Materials to Roof Radiation Heat Exchange". En 2nd International Conference on Computer and Information Applications (ICCIA 2012). Paris, France: Atlantis Press, 2012. http://dx.doi.org/10.2991/iccia.2012.124.

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Zhang, Yaqi, Vadim Shapiro y Paul Witherell. "Towards Thermal Simulation of Powder Bed Fusion on Path Level". En ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-98046.

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Abstract Powder bed fusion (PBF) is a widely used additive manufacturing (AM) technology to produce metallic parts. Understanding the relationships between process parameter settings and the quality of finished parts remains a critical research question. Developing this understating involves an intermediate step: Process parameters, such as laser power and scan speed, influence the ongoing process characteristics, which then affect the final quality of the finished parts. Conventional approaches to addressing those challenges such as powder-based simulations (e.g., discrete element method (DEM)) and voxel-based simulations (e.g., finite element method (FEM)) can provide valuable insight into process physics. Those types of simulations, however, are not well-suited to handle realistic manufacturing plans due to their high computational complexity. Thermal simulations of the PBF process have the potential to implement that intermediate step. Developing accurate thermal simulations, however, is difficult due to the physical and geometric complexities of the manufacturing process. We propose a new, meso-scale, thermal-simulation, which is built on the path-level interactions described by a typical process plan. Since our model is rooted in manufactured geometry, it has the ability to produce scalable, thermal simulations for evaluating realistic process plans. The proof-of-concept simulation result is validated against experimental results in the literature and experimental results from National Institute of Standards and Technology (NIST). In our model, the laser-scan path is discretized into elements, and each element represents the newly melted material. An element-growth mechanism is introduced to simulate the evolution of the melt pool and its thermal characteristics during the manufacturing process. The proposed simulation reduces computational demands by attempting to capture the most important thermal effects developed during the manufacturing process. Those effects include laser-energy absorption, thermal interaction between adjacent elements and elements within the underneath substrate, thermal convection and radiation, and powder melting.
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Makarets, M. V. "Computer Simulation of the Irradiation Effect on the Modification of Carbon Nanostructures". En STRUCTURAL AND ELECTRONIC PROPERTIES OF MOLECULAR NANOSTRUCTURES: XVI International Winterschool on Electronic Properties of Novel Materials. AIP, 2002. http://dx.doi.org/10.1063/1.1514147.

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Rashid, Joseph Y. R., Timothy Hardin, Mark M. Rashid, Robert S. Dunham y Keith Kubischta. "Damage-Based Modeling and Analysis of Reactor Vessels With Numerous Base Metal Ultrasonic Indications". En ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97116.

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The numerous indications recently found by UT-inspection in the reactor pressure vessel shell forgings at two Belgian nuclear power plants have raised some concerns about the effects of such indications on the vessel integrity and fitness for continued service. The UT indications have been attributed to hydrogen flaking, and preliminary estimates give a density of ∼40 indications per liter, with diameter of about 10–14 mm, oriented at a shallow ∼10° angle to the vessel inner surface. This type of high-density indications would not be characterized as geometric flaws with well defined crack-tip geometry that permits high-fidelity application of traditional fracture mechanics methods. An alternative analysis approach, with higher fidelity simulation of this type of “distributed discontinuities”, is proposed, as described in this paper. From a behavioral standpoint, the UT indications at Doel 3 and Tihange 2 represent material discontinuities whose mechanical effect can be evaluated using a damage-mechanics-based constitutive model. Previously, a special multiphase damage model was developed for cladding with zirconium hydrides, of similar morphology to the Doel 3 indications, in which the metal matrix and the hydride platelets are treated as separate material phases interacting at their interfaces with appropriate constraint conditions between them to ensure strain and stress compatibility. The hydride precipitates are represented as a brittle material and the metal matrix is modeled as a ductile elastic-plastic material. This damage model was implemented in a finite element computer program, and was validated using ring-tension and ring-compression tests of cladding specimens with various hydride morphologies. The model was able to predict specimens complete stress-strain curves and failure states with very high accuracy. The above described damage model is adapted to the high-density UT indications, morphology and distribution similar to the conditions of the Doel 3 vessel. The “hydrogen flakes” are characterized in the model as distributed damage of known orientation and volume fraction. A vessel of typical geometry and radiation-dependent mechanical properties is analyzed for various values of volume fraction of hydrogen flakes, and considering a transient loading scenario that conservatively simulates pressurized thermal shock. Interlinking of the “hydrogen flakes” and propagation of damage through the wall under the specified loading condition are part of the model’s capability of directly predicting whether or not vessel failure will occur. Thus, vessel susceptibility to failure and failure margin are judged by the degree of damage propagation through the wall.
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Informes sobre el tema "Materials – Effect of radiation on – Computer simulation"

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Pratt, L. R., A. E. Garcia y G. Hummer. Computer simulation of protein solvation, hydrophobic mapping, and the oxygen effect in radiation biology. Office of Scientific and Technical Information (OSTI), agosto de 1997. http://dx.doi.org/10.2172/524859.

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