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Müller, Matthias S. "Fast algorithms for the simulation of granular particles". [S.l. : s.n.], 2001. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB9716193.
Pełny tekst źródłaZegenhagen, Stefan. "Destabilization of Alfvén eigenmodes by fast particles in W7-AS". [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=984442553.
Pełny tekst źródłaPinches, Simon David. "Nonlinear interaction of fast particles with Alfven waves in tokamaks". Thesis, University of Nottingham, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362917.
Pełny tekst źródłaLilley, Matthew Keith. "Resonant interaction of fast particles with Alfvén waves in spherical tokamaks". Thesis, Imperial College London, 2009. http://hdl.handle.net/10044/1/5487.
Pełny tekst źródłaVincenzi, Pietro. "Interaction between neutral beam fast particles and plasma in fusion experiments". Doctoral thesis, Università degli studi di Padova, 2016. http://hdl.handle.net/11577/3424363.
Pełny tekst źródłaL’iniezione di fasci di particelle neutre (neutral beam injection NBI) é uno dei metodi piú utilizzati e affidabili per scaldare il plasma in esperimenti sulla fusione termonucleare confinata magneticamente. L’NBI é utilizzato nella maggior parte degli attuali esperimenti, verrá applicato come riscaldamento dominante in ITER e studi sono in corso per implementare l’NBI nel progetto europeo del futuro reattore dimostrativo DEMO. L’NBI gioca un ruolo fondamentale per i plasmi fusionistici in termini di riscaldamento e capacitá di indurre corrente nel plasma. Questa tesi presenta il lavoro svolto durante i tre anni del mio dottorato e si focalizza su studi numerici dell’interazione tra particelle energetiche provenienti dall’NBI e plasmi confinati magneticamente. Gli aspetti principali discussi sono la ionizzazione del fascio di neutri nel plasma, il confinamento e le perdite degli ioni veloci, la deposizione di potenza e la corrente di plasma indotta dal fascio. Viene inoltre presentata una breve discussione sull’NBI come sorgente di particelle. Diversi codici numerici sono stati applicati per lo studio di esperimenti caratterizzati da un riscaldamento dominante tramite NBI: sono stati studiati il piú grande tokamak attivo al mondo (JET), il piú grande stellarator attivo al mondo (LHD) e il progetto del reattore dimostrativo europeo DEMO. Accurate simulazioni dell’iniezione del fascio neutro sono state elaborate grazie ad un codice Monte Carlo per l’analisi di esperimenti di JET. Una simulazione predittiva é stata condotta con l’intento di ricostruire il profilo di temperature ionica del plasma nel caso di rilevante riscaldamento ionico da parte dell’NBI. Ció ha prodotto un’attendibile ricostruzione in un caso in cui le misure sperimentali non erano disponibili a causa di un problema con lo strumento di misura. L’interazione tra NBI e plasma al JET é stata studiata tramite simulazioni predittive anche per scariche in idrogeno, partendo da scariche di riferimento in deuterio, con l’obbiettivo di studiare gli effetti che il cambiamento isotopico provoca sul plasma di JET. Studi sugli effetti isotopici sono stati effettuati anche per LHD, esperimento a configurazione elicoidale, dove si stanno preparando i futuri esperimenti in deuterio al posto degli usuali esperimenti in idrogeno. L’iniezione di particelle neutre é una delle opzioni come riscaldamento addizionale del plasma per il futuro reattore dimostrativo DEMO. Attualmente uno studio pre-concettuale di questo reattore é in corso a livello europeo. Simulazioni degli scenari di DEMO sono state effettuate sia per il progetto di un DEMO pulsato, sia per un DEMO a funzionamento stazionario. Il ruolo dell’NBI come riscaldamento principale e sistema per indurre la corrente di plasma é stato investigato tramite studi di sensibilitá, confronti con altri sistemi di riscaldamento e simulazioni delle fasi transitorie del plasma (accensione - ramp-up - e spegnimento - ramp-down - della scarica).
Girardo, Jean-Baptiste. "Control of instabilities and turbulence by fast particles in fusion plasmas". Palaiseau, Ecole polytechnique, 2015. http://www.theses.fr/2015EPXX0121.
Pełny tekst źródłaChen, Li. "Fast pyrolysis of millimetric wood particles between 800°C and 1000°C". Thesis, Lyon 1, 2009. http://www.theses.fr/2009LYO10258.
Pełny tekst źródłaThe present work is part of a project of the French energy research centre Commissariat à l’Energie Atomique. The goal of the project is to develop processes of production of gaseous or liquid fuel from synthesis gas obtained by gasification of lignocellulosic biomass. The objective of the present work is to study the pyrolysis behaviour of millimetric biomass particles under the operating conditions encountered in fluidized bed or entrained flow gasifiers, namely high external heat flux (105 – 106 W⋅m-2) and high temperature (> 800°C). First, pyrolysis experiments are conducted at 800 and 950°C in a lab-scale drop tube reactor on wood particles between 350 and 800 μm. The results show that under the explored conditions, the increase of the particle size only increases the time required for pyrolysis but does not affect the product distribution during pyrolysis. Since in the pyrolysis experiments, the particle residence time cannot be directly measured, PTV (Particle Tracking Velocimetry) measurements are performed at room temperature to characterize the evolution of the particle size and density along pyrolysis and to validate a drag coefficient correlation for the particle residence time calculation. The optical measurements show that at the end of pyrolysis there is a decrease of particle density of 70 – 80% and of particle size of 25 – 40%. It is also proven that the particle slip velocity cannot be neglected and that the change of these particle properties must be taken into account for the calculation of the particle slip velocity and residence time. Finally, based on these experimental results, a 1D shrinking-core model is developed that is able to predict the solid/gas/tar yields and the residence time of a single particle along pyrolysis in the drop tube reactor. It is validated on both the pyrolysis and optical experiments. The model sensitivity analysis shows that even for millimetric particles, the accurate knowledge of the heat of pyrolysis, of the wood density and of the char thermal conductivity is essential
Feher, Tamas Bela [Verfasser]. "Simulation of the interaction between Alfvén waves and fast particles / Tamas Bela Feher". Greifswald : Universitätsbibliothek Greifswald, 2014. http://d-nb.info/1048536556/34.
Pełny tekst źródłaMüller, Matthias S. [Verfasser]. "Fast algorithms for the simulation of granular particles / Rechenzentrum, Universität Stuttgart... Matthias S. Müller". Stuttgart : RUS [u.a.], 2001. http://d-nb.info/964089122/34.
Pełny tekst źródłaCORREA, DEISE A. C. "Estudo da fluencia do aco inoxidavel AISI-316 irradiado com neutrons rapidos e particulas alfa". reponame:Repositório Institucional do IPEN, 1986. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9886.
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Dissertacao(Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
Bergkvist, Tommy. "Non-linear dynamics of Alfvén eigenmodes excited by fast ions in tokamaks". Doctoral thesis, KTH, Fusionsplasmafysik, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4320.
Pełny tekst źródłaQC 20100628
Tran, Nhan Thanh. "Numerical methods for solving wave scattering problems". Diss., Kansas State University, 2016. http://hdl.handle.net/2097/32508.
Pełny tekst źródłaDepartment of Mathematics
Alexander G. Ramm
In this thesis, the author presents several numerical methods for solving scalar and electromagnetic wave scattering problems. These methods are taken from the papers of Professor Alexander Ramm and the author, see [1] and [2]. In Chapter 1, scalar wave scattering by many small particles of arbitrary shapes with impedance boundary condition is studied. The problem is solved asymptotically and numerically under the assumptions a << d << λ, where k = 2π/λ is the wave number, λ is the wave length, a is the characteristic size of the particles, and d is the smallest distance between neighboring particles. A fast algorithm for solving this wave scattering problem by billions of particles is presented. The algorithm comprises the derivation of the (ORI) linear system and makes use of Conjugate Orthogonal Conjugate Gradient method and Fast Fourier Transform. Numerical solutions of the scalar wave scattering problem with 1, 4, 7, and 10 billions of small impedance particles are achieved for the first time. In these numerical examples, the problem of creating a material with negative refraction coefficient is also described and a recipe for creating materials with a desired refraction coefficient is tested. In Chapter 2, electromagnetic (EM) wave scattering problem by one and many small perfectly conducting bodies is studied. A numerical method for solving this problem is presented. For the case of one body, the problem is solved for a body of arbitrary shape, using the corresponding boundary integral equation. For the case of many bodies, the problem is solved asymptotically under the physical assumptions a << d << λ, where a is the characteristic size of the bodies, d is the minimal distance between neighboring bodies, λ = 2π/k is the wave length and k is the wave number. Numerical results for the cases of one and many small bodies are presented. Error analysis for the numerical method are also provided.
Regan, Cyril. "Modéles réduits pour le transport de particules rapides dans le cadre de la fusion par confinement inertiel". Thesis, Bordeaux 1, 2010. http://www.theses.fr/2010BOR14138/document.
Pełny tekst źródłaThe energy transport in the Fast Ignition scheme within the framework of Inertial Confinement Fusion (ICF) is done by means of energetic charged particles, relativistic electrons or fast ions. The particle transport and energy deposition process is rather complicated and its detailed description requires large scale kinetic multidimensional calculations. These codes are CPU time consuming and cannot be easily implemented in radiation hydrodynamic codes that describe the fuel assembly, resulting energy deposition and the combustion. Reduced methods are needed that account for the main features of the kinetic transport process and are sufficiently fast and efficient to be introduced directly in an hydrodynamic module. We have developed two reduced models of charged particles transport, suitable for integration in hydro-codes. The first model, called Trumpet, is a two-dimensional extension of a simplified 1D model for the average scattering angle. The second model called M1 is a simplification of the Fokker Planck equation, based one the angular closure respecting the minimum entropy principle. These two models have been integrated in the CELIA hydrodynamic code (CHIC). After considering the advantages and limitations of these models, we used them to calculate the ion energy deposition in a compressed target. We have modelled the protonic radiography of a cylindrical laser-driven impulsion, and analyse a new fast ignition scheme with fast deuterium tritium and carbon ions accelerated by laser
Henkel, Marion [Verfasser]. "Measurements of ion temperatures and fast particles in the scrape-off layer of W7-X stellarator and EAST tokamak / Marion Henkel". Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2021. http://d-nb.info/1239413556/34.
Pełny tekst źródłaFomin, Alex. "Multiple Scattering Effects on the Dynamics and Radiation of Fast Charged Particles in Crystals. Transients in the Nuclear Burning Wave Reactor". Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLS272/document.
Pełny tekst źródłaThe coherent effects in the high energy particle interaction with crystals open up new opportunities for accelerating and detecting techniques. The effective electromagnetic fields that arise in this case can exceed a thousand times the fields that are now attainable at experimental installations. The first part of the thesis is devoted to the theoretical study of the multiple scattering effects on the dynamics and radiation of high energy charged particles in crystals. One of the goals of this study is to find optimal conditions to carry out the measurement of the anomalous magnetic moment of the charmed Lambda Baryon at the LHC. Due to the short lifetime of this particle the only way to provide such a measurement is to use a bent crystal, which can imitate the magnetic field of order of thousand Tesla. The optimization of the parameters for an experimental setup was carried out on the basis of computer simulation of the Lamda Baryon passage through a bent crystal using the binary collisions model, taking in to account incoherent scattering on thermal vibrations of atoms at lattice nodes, and scattering on an electronic subsystem of a crystal. The results of the research conducted in the thesis give an optimistic forecast for the possibility of carrying out such an experiment at the LHC and became the basis of the corresponding proposal. The multiple scattering effects of the thesis. This study is performed in the framework of classical electrodynamics approach for describing the relativistic particle radiation and the computer simulation of fast charged particles passing through a crystal using the above-mentioned model. It is shown, that the spectral-angular distribution and the polarization characteristics of radiation essentially differ from the results of the Bethe–Heitler theory. The conditions for the experimental observation of these effects are presented. The second part of the thesis is devoted to the study of transient processes in advanced fast reactor breeder working in a self-sustained nuclear burning wave (NBW) regime. It is a new concept of nuclear fission reactors with the so-called “intrinsic safety”, in which the development of uncontrolled chain nuclear reaction is impossible due to the physical principles of reactor operation. The promising concepts of NBW reactor in the case of its implementation allows to utilize the depleted Uranium and provides the treatment of long-lived radioactive waste. This study is based on numerical solving the non-stationary non-linear diffusion equation of neutron transport together with a set of the burn-up equations for fuel components and the equations of nuclear kinetics for precursor nuclei of delayed neutrons using effective multi-group approach. The model of cylindrical homogeneous reactor with metallic fuel of U–Pu, Th–U and mixed Th–U–Pufuel cycles is considered in the framework of the buckling concept. As a result of these studies the existence of the NBW mode in the case of mixed Th–U–Pu fuel and its essential advantages are demonstrated; the detailed analysis of a special kind of the negative reactivity feedback that is inherent to the NBW regime and underlies the “intrinsic safety” of such a reactor is performed; the scenarios of a smooth start-up, forced shutdown and subsequent restart of the NBW reactor are developed
Laxåback, Martin. "Fast wave heating and current drive in tokamaks". Doctoral thesis, KTH, Alfvénlaboratoriet, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-118.
Pełny tekst źródłaQC 20100506
Dvornova, Anastasiia. "Simulations hybrides fluides-cinétiques de l'excitation des modes TAE via particules rapides et une antenne externe". Electronic Thesis or Diss., Aix-Marseille, 2021. http://www.theses.fr/2021AIXM0265.
Pełny tekst źródłaIn this thesis, the excitation of a specific types of the MHD modes called the Toroidal Alfven Eigenmodes is studied. These global modes can be easily destabilized by one of the several populations of the fast particles present in tokamaks. For the first time the modelling of the excitation of the TAE modes by a 3D external antenna is performed in case of limiter and X-point geometries. With the use of the code CASTOR it has been shown that the damping from the region inside the separatrix with plasma boundary approaching the separatrix can be a source of an increased damping for certain density profile shapes. The results obtained with the JOREK code identifies the region of the open-field lines as the main source of damping. Firther, the purely fluid code JOREK was modified to include the kinetic terms provided by the code's kinetic extension. Between the two commonly used hybrid schemes, pressure and current coupling schemes. In order to confirm the implementation of the scheme, the TAE linear growth rates are obtained for the ITPA benchmark case. A further step that was taken is to combine the previously used approaches by examining the evolution of the TAE modes excited by an external antenna now in the presence of fast particles. The principal interest in this approach is to investigate the possibility of extracting information on the fast particle drive from the plasma response on the TAE excitation. A method allowing an estimate of the fast particle drive by measuring the difference in the frequency response of the two directions of the traveling TAE waves was developed
Yang, Minglin. "Computation of light scattering, radiation force, torque and stress of large non-spherical particles with Multilevel Fast Multipole Algorithm and Vectorial Complex Ray Model". Rouen, 2014. http://www.theses.fr/2014ROUES055.
Pełny tekst źródłaŠesták, Jozef. "Rychlá separace výbušnin vysokoúčinnou kapalinovou chromatografií". Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2011. http://www.nusl.cz/ntk/nusl-216722.
Pełny tekst źródłaDelshadi, Sarah. "Tests de diagnostic immunologique rapides combinant des nanoparticules magnétiques et des micro-aimants structurés". Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAV070.
Pełny tekst źródłaThis thesis reports the development of innovative, sensitive and fast immunoassays combining functionalized superparamagnetic nanoparticles (SPN) and micro-magnets. Our magnetic immunoassays exploit high gradients generated by micro-magnets to capture immune-complexes captured on SPN. Magnetic attraction is widely used in biotechnology, because it provides long-range forces able to capture molecules of interest. Bead-based immunoassays use common centimetre-scale magnets to attract micro-particles. Those magnets generate low magnetic gradients and struggle to capture superparamagnetic nano-particles, which are too small and mobile to be efficiently trapped. Down-scaling the size of magnetic particles is very interesting since it allows diffusion-based transport to perform faster reactions, while avoiding particle sedimentation and aggregation. Furthermore, it increases the reaction surface, which improves the sensitivity of immunoassays. Thanks to the scaling law effects micro-magnets from Institut Néel generate high local gradients and therefore large magnetic volume forces: we use this innovative technology to develop fast immuno-assays that take advantage of a radical size reduction, compared to commercial technology.We first developed a colorimetric magnetic immunoassay (MagIA) as a new approach to standard ELISA. A proof-of-concept based on colorimetric quantification of anti-ovalbumin antibody in buffer was performed and compared with conventional ELISAs. After optimization, MagIA exhibits a limit of detection and dynamic range similar to ELISAs developed using the same biochemical tools. Micromagnets made by the micro-magnetic imprinting method can be fully integrated in multi-well plates at low cost, allowing the efficient capture of immuno-complexes carried by SPNs. The method is generic and performs magnetic ELISA in 30 min.We then developed a magnetically localized fluorescent immunoassay (MLFIA) exploiting the local capture of SPN on micro-magnets. The differential measurement of fluorescence localized on and besides micro-magnet arrays allows the detection and quantification of a molecule in only 15 minutes without fluid handling. We present a proof of concept based on the detection of monoclonal antibody anti-ovalbumin. Functionalized nanoparticles are incubated with fluorescent detection antibody and the sample containing the molecule to be detected. After a single incubation step, the nanoparticles are captured on micro-magnets made by thermo-magnetic patterning. Fluorescence is then read under a microscope. Differential measurement between the signal from the immunological complex localised on the micro-magnets and the non-specific signal localised besides micro-magnets allows the quantification of mAb anti-OVA. The performance of MLFIA was compared with conventional ELISA and exhibits a limit of detection up to 100 times better for anti-OVA mAb in PBS. For further validation, MLFIA was used to measure clinical parameters: we developed a sandwich assay to detect C-reactive protein, and a serology for Toxoplasma gondii immunoglobulin G and M or osteopontin in human samples. Comparisons with data obtained with routine clinical automatized methods show excellent correlation. Our MLFIA technology presents several key advantages: it is compatible with biological media (serum, plasma), uses small volumes and requires little energy. It also is versatile and thus can be used to detect any antigen or antibody in complex media. We are currently developing a portable prototype for point-of-care diagnostics. The results will open the way to a new generation of sensitive immunological lab-on-chip
Saayman, Jean. "Combined hydrodynamic and reaction analysis of a bubbling to turbulent Fluidized Bed Reactor". Thesis, University of Pretoria, 2013. http://hdl.handle.net/2263/40221.
Pełny tekst źródłaThesis (PhD)--University of Pretoria, 2013.
gm2014
Chemical Engineering
unrestricted
Johansson, Dorota. "Colloids in fats the fat crystal as a functional particle /". Lund : Lund University, 1994. http://catalog.hathitrust.org/api/volumes/oclc/39676932.html.
Pełny tekst źródłaTaghavi, Ehsan, Fredrik Lindsten, Lennart Svensson i Thomas B. Schön. "Adaptive stopping for fast particle smoothing". Linköpings universitet, Reglerteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-93461.
Pełny tekst źródłaCNDM
CADICS
Laisney, Jérôme. "Influence de l’environnement sur la commutation et la bistabilité thermique de micro- et de nanoparticules à transition de spin". Thesis, Paris 11, 2015. http://www.theses.fr/2015PA112002.
Pełny tekst źródłaSpin-transition compounds are a class of materials for which the spin-state switching of the metal center can be controlled by various stimuli (T, P, light irradiation,...) and produces dramatic changes of physical properties (magnetic, optical, structural or vibrational). With respect to the set of switchable materials, a number of spin-transition compounds exhibit at solid-state cooperative processes and thermal hysteresis loops (bistability), particularly suitable for information storage. One of the current technological challenges is to integrate in devices such potentially interesting materials without altering their properties. The goal of the research, recently developed by several teams, is to determine the smaller size of object in which an information can be stored, and thus to understand the effect of downsizing on cooperativity and bistability. Therefore, the objectives of the Ph-D thesis were (i) to synthesize spin-crossover nano- and microparticles from molecular materials that in the form of bulk undergo a first-order phase transition; (ii), to investigate the importance of particles size and matrix effects on the spin-transition process.After a first chapter in which the spin crossover materials are introduced, the second chapter describes the synthesis of particles of FeII(phen)2(NCX)2 (X = S, Se) and [FeIII(3-OMeSalRen)2]PF6 (R = Me, E) compounds. As the fast precipitation technique essentially suits for ionic compounds, its application to neutral ones like FeII(phen)2(NCX)2, has been made possible by an indirect syntheses based on the ligand extraction from soluble precursors and the control of nucleation and growth processes of neutral products via experimental parameters. New particles of [FeIII(3-OMeSalEen)2]PF6 and thin films containing them after their dispersion in a polymeric matrix (PVP) have been prepared. The study of these films with UV-vis and magnetic measurements has raised the issue of the impact of the polymeric matrix and processing on the spin transition properties of these particles.The second part of the manuscript focuses on the interaction between the spin-crossover particles and the dispersing medium. This interaction between microparticles of Fe(phen)2(NCS)2 and glassy matrices (Tg > T1/2, T1/2, being the transition temperature) may result in the observation of large hysteresis loops shifted towards lower temperatures. This bistability has been examined with the FORC (First-Order Reversal Curves) method, magnetic measurements and a theoretical model. This analysis has shown the existence of reversible components associated to the particles/matrix interactions and the change of volume of spin-crossover particles.In a third part, the study of matrix and size effect has been pursued with micro- and nanocrystals of [FeIII(3-OMeSalEen2]PF6 encapsulated in polymeric or molecular liquids which form glasses at sufficiently low temperature. The encapsulation in rigid glasses of high spin (T1/2 < Tg) or low spin (T1/2 > Tg) particles give rise to transitions shifted towards lower or higher temperature respectively, possibly with cooperativity and hysteresis. The reinforcement of cooperativity and the bistability observed in the second case have been accounted for by the effect of the mechanical stress exerted by the glassy matrix on the particle volume. In addition, it has been shown that a thermal treatment of matrices (quenching or annealing steps below or above the glass transition) results in the modulation of the matrix effects. Finally, in the last chapter, a few composites including compounds undergoing a spin transition close to room temperature have been shortly investigated in presence of dispersing matrices. The choice of the matrices characteristics (chemical nature, glass transition temperature) has allowed some of these effects to be observed
Kirk, John Daniel. "Particle beam LC/MS with fast atom bombardment". Thesis, Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/27127.
Pełny tekst źródłaHarvey, P. R. "Hyper-fast NMR imaging". Thesis, University of Nottingham, 1991. http://eprints.nottingham.ac.uk/13753/.
Pełny tekst źródłaPippig, Michael. "Massively Parallel, Fast Fourier Transforms and Particle-Mesh Methods". Doctoral thesis, Universitätsbibliothek Chemnitz, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-197359.
Pełny tekst źródłaDie vorliegende Dissertation beschreibt einen modularisierten Blick auf die Struktur schneller numerischer Methoden für die Berechnung der Coulomb-Wechselwirkungen zwischen Ladungen im dreidimensionalen Raum. Die gemeinsame Struktur ist geprägt durch drei selbstständige und auf einander aufbauenden Algorithmen, nämlich der schnellen Fourier-Transformation (FFT), der nicht äquidistanten schnellen Fourier-Transformation (NFFT) und der NFFT-basierten Teilchen-Gitter-Methode (P²NFFT). Für jeden dieser Algorithmen werden Verbesserungen und parallele Implementierungen vorgestellt mit besonderem Augenmerk auf massiv paralleler Skalierbarkeit. Im Kontext der FFT werden parallele Algorithmen aus den Hardware adaptiven Modulen der FFTW Softwarebibliothek zusammengesetzt. Die neuen NFFT-Konzepte beinhalten abgeschnittene NFFT, Versatz, analytische Differentiation und optimierte Entfaltung im Fourier-Raum bezüglich des mittleren quadratischen Aliasfehlers. Mit Hilfe dieser Verallgemeinerungen bietet die NFFT einen vereinheitlichten Zugang zu Teilchen-Gitter-Methoden. Insbesondere gemischt periodische Randbedingungen werden einheitlich behandelt und Versatz wird effizienter umgesetzt. Heuristiken für die Parameterwahl werden auf Basis sorgfältiger Fehlerabschätzungen angegeben
Gudmundsson, Magnus. "Heavy particle interference and diffraction in fast electron transfer collisions". Doctoral thesis, Stockholms universitet, Fysikum, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-57190.
Pełny tekst źródłaAt the time of the doctoral defense, the following paper was unpublished and had a status as follows: Paper 3: Manuscript.
Cardinali, Matteo [Verfasser]. "Fast frontend electronics for high rate particle detectors / Matteo Cardinali". Mainz : Universitätsbibliothek Mainz, 2015. http://d-nb.info/1074160134/34.
Pełny tekst źródłaVallar, Matteo. "Neutral beam fast particle physics in fusion plasma integrated scenarios". Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3425245.
Pełny tekst źródłaO aquecimento por injeção de feixes de neutros é um dos métodos mais fiáveis para aquecer um plasma até às temperaturas necessárias para atingir fusão termonuclear estacionária. Este tipo de sistema injeta neutros com ener- gias muito superiores à energia dos iões que constituem o grosso do plasma, introduzindo uma população de partículas energéticas que, colidindo com os iões e electrões do plasma, transmite a energia ao plasma. Adicionalmente, esta população de partículas energéticas também induz corrente no plasma, contribuindo para a manutenção da descarga. O tema central desta tese incide na modelização numérica do compor- tamento de partículas rápidas num plasma de Tokamak. Códigos analíti- cos e de numéricos de Monte Carlo foram aplicados a diferentes máquinas (RFX-mod, JT-60 SA and TCV) com vista a estudar o impacto destas partícu- las em cenários de operação indutivos (cenário standard) e não indutivos (avançado). A máquina RFX-mod está a ser melhorada e a instalação de injectores de feixes neutros (com parâmetros e geometria fixos) é uma das possíveis melhorias. Deste modo, o impacto das partículas energéticas nos plasmas do RFX-mod é discutida neste trabalho usando o código analítico METIS. O impacto de partículas energéticas no tokamak superconductor JT-60SA é estudado com o código de Monte Carlo ASCOT. Neste Tokamak, o aqueci- mento do plasma e a geração de corrente, seja em cenário de operação stan- dard ou avançado, é garantido em grande parte por um conjunto de feixes de injeção de neutros. Neste trabalho, a dinâmica das partículas rápidas nos cenários standard e avançado do JT-60SA é analisada, evidenciando a fiabili- dade do sistema de injeção de neutros no Tokamak. Um injector de feixes neutros foi instalado no Tokamak TCV há três anos. Este feixe é importante dado que deposita potência predominantemente nos iões e permite alargar o regime de operação do tokamak. Nesta tese, após uma revisão da condição atual do feixe de neutros e da operação com ele realizada nos últimos três anos, é feito um estudo sobre o impacto do aque- cimento por injeção de ondas electro-c
Pringle, Gavin J. "Numerical study of three-dimensional flow using fast parallel particle algorithms". Thesis, Edinburgh Napier University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.385914.
Pełny tekst źródłaDaniels, Graham Clinton. "Observing flow using fast neutron radiography and positron emission particle tracking". Doctoral thesis, Faculty of Science, 2021. http://hdl.handle.net/11427/33606.
Pełny tekst źródłaSohl, Lukas. "Development of PICOSEC-Micromegas for fast timing in high rate environments". Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASP084.
Pełny tekst źródłaFuture particle physics experiments will face an increasing particle flux with rising beam luminosity. Detectors close to the interaction point will need to provide robustness against the high particle flux. Moreover, a time resolution of tens of picosecond for Minimum Ionising Particles will be necessary to ensure a clear vertex separation of the reconstructed secondary particles and to reduce pile-up. This manuscript focusses on the PICOSEC-Micromegas, an innovative particle detector based on the Micromegas readout coupled to a Cherenkov radiator and a photocathode in front of the gaseous volume. In this way, each primary electron is located on the surface of the photocathode, suppressing thus the inevitable time jitter of several nanoseconds, due to the different ionisation positions created by the passage of a particle from the drift region of a gaseous detector. The drift region length is reduced to the same order of magnitude as the amplification region (100-200 μm) to minimise direct gas ionisation, and it is additionally used as a pre-amplification stage. A mathematical model, based on GARFIELD++ simulations, is developed to describe the propagation of the pre-amplification avalanche showing that the length and multiplication of the avalanche in the drift region is the dominant factor in the timing performance. The PICOSEC-Micromegas concept is studied with several prototypes optimising the electric fields, the drift distance, and the gas mixture in the LIDYL (Laboratoire Interactions, Dynamiques et Lasers) UV laser facility. A single photoelectron time resolution of ~44 ps is measured with the shortest tested drift region length of 119,μm and the highest stable field setting. Measurements performed in the secondary particle beam at CERN have resulted in a time resolution of 24 ps for 150 GeV muons with a drift region length of 200 μm and a CsI photocathode providing 10 photoelectrons per MIP. In order to evolve from the detection concept to a versatile instrument, several prototypes are developed, focusing on specific properties needed for future applications: anode segmentation, spark quenching, photocathode efficiency and robustness for higher particle flux. An hexagonal segmented multipad prototype is tested in the beam with a time resolution of ~36 ps in the central pad. The operation in high rate environments is studied with different resistive strip and floating strip anodes resistive detectors in muon and pion beams. Time resolutions significantly under 100 ps and stable operation in the pion beam are achieved with all resistive prototypes. Robust photocathode materials, as an alternative to CsI, are investigated to reduce degradation from the ion-backflow generated in the pre-amplification avalanche. The most promising materials are diamond-like carbon (DLC) and boron carbide (B4C). Considering all the results achieved, two application cases are projected with the PICOSEC-Micromegas detector. The first one is the use in a calorimeter as a timing layer. Many secondary particles are produced in an electromagnetic calorimeter after few radiation lengths and a time resolution down to ~5 ps is expected with the PICOSEC-Micromegas. The second one is particle identification trough time-of-flight (TOF) measurements. The PICOSEC-Micromegas is expected to double the momentum range of current TOF detectors for π/Κ separation with 3σ
Park, Bum Jun. "Interactions between colloidal particles at oil-water interfaces". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 96 p, 2008. http://proquest.umi.com/pqdweb?did=1475189581&sid=20&Fmt=2&clientId=8331&RQT=309&VName=PQD.
Pełny tekst źródłaSchlegel, Fabrice. "A fast 3D particle method for simulations of buoyant and reacting flows". Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/42308.
Pełny tekst źródłaIncludes bibliographical references (p. 89-91).
This thesis describes progress in several areas related to three dimensional vortex methods and their application to multiphysics problems. The first is the solution of a generic scalar transport equation by advecting and diffusing the scalar gradient along a particle trajectory and onto a mesh, respectively, and recovering the scalar values using a Biot-Savart-like summation. The second is the accurate, high-resolution calculation of the velocity gradient using a fast treecode, which avoids using kinematic relations between the evolution of the gradients and the distortion of the flow map. The same tree structure is used to compute all the variables of interest and those required during the integration of the governing equations. Next, we apply our modified interpolation kernel algorithm for treating diffusion and remeshing to maintain long time accuracy. The coupling between the vorticity transport and that of a dynamic scalar, in this case the temperature or density in a gravitational field, is manifested by the generation of vorticity. We demonstrate the performance of the multiphysics algorithm by solving a number of buoyant and reacting flow problems.
by Fabrice Schlegel.
S.M.
Lauber, Philipp. "Linear gyrokinetic description of fast particle effects on the MHD stability in tokamaks". [S.l. : s.n.], 2003. http://deposit.ddb.de/cgi-bin/dokserv?idn=969890222.
Pełny tekst źródłaPippig, Michael, i Daniel Potts. "Parallel Three-Dimensional Nonequispaced Fast Fourier Transforms and Their Application to Particle Simulation". Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-94926.
Pełny tekst źródłaAsquith, Nicola Louise. "Fast and thermal Accelerator Driven Systems: Studies of secondary particle production and transport". Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/14150.
Pełny tekst źródłaNestler, Franziska. "Efficient Computation of Electrostatic Interactions in Particle Systems Based on Nonequispaced Fast Fourier Transforms". Universitätsverlag der Technischen Universität Chemnitz, 2017. https://monarch.qucosa.de/id/qucosa%3A23376.
Pełny tekst źródłaDie vorliegende Arbeit widmet sich der Berechnung elektrostatischer Wechselwirkungen in Partikelsystemen, was beispielsweise im Bereich der molekulardynamischen Simulationen eine zentrale Rolle spielt. Um die dafür benötigten physikalischen Größen mit lediglich O(N log N) arithmetischen Operationen zu berechnen, nutzen sogenannte Teilchen-Gitter-Methoden die Ewald-Summation sowie die schnelle Fourier-Transformation (FFT). Typischerweise können derartige Verfahren Systeme von Punktladungen unter periodischen Randbedingungen in allen Raumrichtungen handhaben. Periodizität ist jedoch nicht immer bezüglich aller drei Dimensionen erwünscht. Des Weiteren spielen auch Wechselwirkungen zu Dipolen in vielen Anwendungen eine wichtige Rolle. Zentraler Gegenstand dieser Arbeit ist die Partikel-Partikel-NFFT Methode (P²NFFT), ein Teilchen-Gitter-Verfahren, welches auf der schnellen Fouriertransformation für nichtäquidistante Daten (NFFT) basiert. Eine Erweiterung dieses Verfahrens auf gemischt periodische sowie offene Randbedingungen wird vorgestellt. Außerdem wird die Methode für die Behandlung von Partikelsystemen, in denen sowohl Ladungen als auch Dipole vorliegen, angepasst. Somit wird erstmalig ein effizienter Algorithmus für gemischte Ladungs-Dipol-Systeme präsentiert, der zusätzlich die Behandlung sämtlicher Arten von Randbedingungen mit einem einheitlichen Zugang erlaubt. Entsprechende Fehlerabschätzungen sowie Strategien für die Parameterwahl werden entwickelt und anhand numerischer Beispiele verifiziert.
Sghaier, Halim. "Electronique rapide de décision associée à un compteur Cherenkov de faisceau". Grenoble 1, 1993. http://www.theses.fr/1993GRE10015.
Pełny tekst źródłaHanazawa, Tomohito. "Effects of fat particles on the stability of complex food systems". Kyoto University, 2019. http://hdl.handle.net/2433/242551.
Pełny tekst źródłaAston, David Eric. "Quantifying single oil-particle interactions in aqueous media /". Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/9898.
Pełny tekst źródłaPerks, Jonathan Michael. "Phosphorus segregation and diffusion in nickel and Fe-Cr-Ni alloys under fast particle irradiation". Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329993.
Pełny tekst źródłaLloyd, Rhys David. "Collisional particle in cell modelling of the propagation of fast electrons in solid density plasma". Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/14280.
Pełny tekst źródłaSalyer, Zachary M. "Identification of Optimal Fast Charging Control based on Battery State of Health". The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1587037951166857.
Pełny tekst źródłaHurtig, Tomas. "Plasma cloud penetration across magnetic boundaries". Doctoral thesis, KTH, Alfvén Laboratory, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3804.
Pełny tekst źródłaGu, Chuan. "Development of a fast simulation method for particle-laden fluid interfaces and selected applications to problems involving drops". Thesis, Queen Mary, University of London, 2018. http://qmro.qmul.ac.uk/xmlui/handle/123456789/39752.
Pełny tekst źródłaMoraes, Marlene Silva de. "Convecção forçada de partículas poliméricas em fase diluída : curvas de pressão e distribuição de partículas". [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266776.
Pełny tekst źródłaTese (doutorado) - Universiade Estadual de Campinas, Faculdade de Engenharia Química
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Resumo: O deslocamento de polímeros, cereais, minérios, produtos farmacêuticos e outros materiais particulados no interior de tubulações, tendo como fluido transportador o ar, é denominado de transporte pneumático. Esta técnica é comumente dividida em transporte em fase densa, com concentração de partículas acima de 30% em volume e transporte em fase diluída, com concentração inferior a 1%. A fase diluída, que não exige tubulações espessas e é de menor custo de aquisição, operação e manutenção, tem como principais inconvenientes: a) o desgaste da parte inferior do tubo transportador devido à má distribuição das partículas na seção transversal; b) a falta de dados da perda de carga de tê com saída de lado, que tem substituído curvas em unidades catalíticas de petróleo por criar um colchão amortecedor e reduzir o desgaste e c) a escassez de informações da relação entre a distribuição de partículas na seção transversal do duto e a perda de carga. O presente trabalho teve como objetivo geral projetar e montar uma unidade experimental, em escala piloto com duto de 117 mm de diâmetro, de transporte pneumático para estudar, em fase diluída, as perdas de carga no trecho vertical, singularidades e a distribuição de partículas na seção transversal. Visou como objetivos específicos: a) construir as curvas de perda de carga em função da velocidade do ar, tendo como parâmetro, as vazões de pellets de polipropileno; b) determinar o valor do coeficiente K, multiplicador da carga cinética da expressão geral de perda de carga localizada para tê com saída de lado, com três prolongamentos (balisas) distintos de 30, 60 e 90 mm e c) obter a distribuição das partículas na seção transversal do duto vertical. A unidade projetada e montada consistiu basicamente de um ventilador centrífugo, com pás semi abertas de 210 mm de diâmetro, acoplado a um motor de rotação variável de 1 cv, um tubo de Pitot horizontal e um vertical, uma válvula rotativa acionada por motor de rotação variável na base de um silo de alimentação, dutos de acrílico estrudados, com diâmetro interno de 117 mm, um sistema de coleta com nove dutos, de seção quadrada paralelos, para análise da distribuição das partículas na seção transversal dos dutos horizontal e vertical e um ciclone. A perda de carga foi determinada através de tomadas de pressão estática, acopladas a anéis piezométricos, com leitura simultânea de todas as tomadas de pressão em uma série de tubos em "U". A velocidade do ar foi obtida por Pitot e anemômetros. A vazão volumétrica do ar foi calculada pelo método das centróides de áreas iguais, com as medidas dos valores coletados pelo Pitot e anemômetro. As vazões dos sólidos particulados foram quantificadas pelo número de revoluções por unidade de tempo da válvula rotativa, aferida pela técnica da massa por tempo. A distribuição de partículas, na seção transversal dos tubos vertical e horizontal e após o tê com saída de lado, foi verificada por pesagem dos sólidos nos coletores. O trabalho forneceu, para o duto horizontal, curvas da perda de carga em função de cinco velocidades de ar de 13,45; 15,18; 16,90; 18,97 e 21,39 m/s e vazões de polipropileno de 0,08; 0,143 e 0,233 kg/s, com a distribuição de partículas em pontos de relevância para projeto. O tê com saída de lado forneceu um coeficiente K de 1,40; com prolongamento de 30 mm, um K de 1,58; com o de 60 mm, um K de 1,43 e com o de 90 mm, um multiplicador (K) igual a 1,47
Abstract: The displacement of polymers, pharmaceutical cereals, ores, pharmaceutical products and other particulate materials in the interior of tubing , having as fluid transporter the air, is called pneumatic transport. This technique is commonly divided in: transport in dense phase, with particles concentration above 30% in volume and transport in diluted phase, with inferior concentration at 1%. The diluted phase, that does not demand thick tubing and is acquired at lesser cost operation and maintenance, has as main inconveniences: a) the consuming of the inferior part of the transporting pipe due to bad distribution of particles in the transversal session; b) the lack of data of the loss of load of T with side exit, that has been replacing curves in catalytic units of oil for creating a cushioning mattress and reducing consuming and c) the scarcity of information of the relation between the particle distribution in the transversal section of the duct and the loading loss. The present work had as general objective to project and build up an experimental unit, in scale pilot with a 117 mm diameter duct, of pneumatic transport to study, in diluted phase, the losses of load in the vertical stretch, the particle singularities and distribution in the transversal section. It aimed as specific objective: a) to construct the curves of loss of load in function of the air speed, having as parameter, the outflows of pellets of polypropylene; b) to determine the value of coefficient K, multiplier of the kinetic load of the general expression of loss of located load for T with side exit, with three distinct prolongations (boundary-makers): 30, 60 and 90 mm and c) to get the distribution of particles in the transversal section of the vertical duct. The projected and built unit consisted basically on a centrifugal fan, with opened half 210 mm diameter shovels, connected to a 1cv changeable rotation engine, a pipe of horizontal Pitot and one vertical line, a rotating valve set in motion by engine of changeable rotation in the base of a feeding silo, extruded acrylic ducts, with internal diameter of 117 mm, a system of collection with nine ducts, square shaped section parallel, for analysis of the distribution of particles in the transversal section of the horizontal and vertical ducts and a cyclone. The loss of load was determined through static pressure heads, connected to piezometric surface rings, with simultaneous reading of all the pressure heads in a series of pipes in "U". The air speed was gotten by Pitot and anemometers. The volumetric outflow of air was calculated by the method of the centroids of equal areas, with the measures of the values collected by the Pitot and anemometer. The outflows of particulates solids were quantified by the number of revolutions per unit of time of the rotating valve, surveyed by the technique of the mass per time. The particle distribution, in the transversal section of the vertical and horizontal pipes and after T with side exit, was verified by weighing solids in the collectors. The work provided to, the horizontal duct, curves of the loss of load in function of five air speeds of 13,45; 15,18; 16,90; 18,97 and 21,39 m/s and polypropylene outflows of 0,08; 0,143 and 0,233 kg/s, with the particle distribution in points of relevance for project. The T with side exit, provided a 1,40 coefficient K; with a 30mm prolongation, a 1,58 K; with 60 mm, a K of 1,43 and with 90 mm, a multiplier (K) equals to 1,47
Doutorado
Sistemas de Processos Quimicos e Informatica
Doutora em Engenharia Quimica
Masse, Lucie. "Anaerobic degradation of fat particles in slaughterhouse wastewater with and without hydrolysis pretreatment". Thesis, University of Ottawa (Canada), 2001. http://hdl.handle.net/10393/9039.
Pełny tekst źródłaJolly, Simon. "An intra-pulse fast feedback system for a future linear collider". Thesis, University of Oxford, 2003. http://ora.ox.ac.uk/objects/uuid:3e17d216-7430-4869-9873-4a469fa9c4c5.
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