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Dissertations / Theses on the topic 'Acceleration reaction'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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1

Fulford, Sarah Yvonne. "The acceleration, mechanistic investigation and application of the Baylis-Hillman reaction." Thesis, University of Bristol, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.416823.

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2

Eckert, Kerstin, Laurence Rongy, and Wit Anne De. "A + B → C reaction fronts in Hele-Shaw cells under modulated gravitational acceleration." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-139288.

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The dynamics of A + B → C reaction fronts is studied under modulated gravitational acceleration by means of a combination of parabolic flight experiments and numerical simulations. During modulated gravity the front position undergoes periodic modulation with an accelerated front propagation under hyper-gravity together with a slowing down under low gravity. The underlying reason for this is an amplification and a decay, respectively, of the buoyancy-driven double vortex associated with the front propagation under standard gravitational acceleration, as explained by reaction–diffusion–convecti

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3

Eckert, Kerstin, Laurence Rongy, and Wit Anne De. "A + B → C reaction fronts in Hele-Shaw cells under modulated gravitational acceleration." Royal Society of Chemistry, 2012. https://tud.qucosa.de/id/qucosa%3A27819.

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The dynamics of A + B → C reaction fronts is studied under modulated gravitational acceleration by means of a combination of parabolic flight experiments and numerical simulations. During modulated gravity the front position undergoes periodic modulation with an accelerated front propagation under hyper-gravity together with a slowing down under low gravity. The underlying reason for this is an amplification and a decay, respectively, of the buoyancy-driven double vortex associated with the front propagation under standard gravitational acceleration, as explained by reaction–diffusion–convecti

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4

Enquist, Per-Anders. "Novel Metal-Mediated Organic Transformations : Focusing on Microwave Acceleration and the Oxidative Heck Reaction." Doctoral thesis, Uppsala : Acta Universitatis Upsaliensis : Universitetsbiblioteket [distributör], 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-7117.

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5

McErlain-Naylor, Stuart A. "The effect of joint compliance within rigid whole-body computer simulations of impacts." Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/33495.

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In high impact human activities, much of the impact shock wave is dissipated through internal body structures, preventing excessive accelerations from reaching vital organs. Mechanisms responsible for this attenuation, including lower limb joint compression and spinal compression have been neglected in existing whole-body simulation models. Accelerometer data on one male subject during drop landings and drop jumps from four heights revealed that peak resultant acceleration tended to decrease with increasing height in the body. Power spectra contained two major components, corresponding to the

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6

Junior, Orli Camargo. "Fator-S astrofísico da reação de captura de próton 8Li(p,)9Be através do estudo da reação de transferência elástica 9Be(8Li,9Be)." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-11052009-111104/.

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Esse trabalho consistiu na determinação do Fator-S astrofísico da reação de captura 8Li(p,)9Be através do estudo da reação de transferência elástica 9Be(8Li,9Be)8Li. O fator espectroscópico do estado ligado 8Li+p=9Be, obtido à partir das medidas da distribuição angular da reação de transferência 9Be(8Li,9Be)8Li, foi utilizado para normalizar a seção de choque da reação de captura 8Li(p,)9Be, e conseqüentemente obter seu Fator-S. As medidas da distribuição angular da reação 9Be(8Li,9Be) foram realizadas no Nuclear Structure Laboratory, que fica localizado na University of Notre Dame no estado d

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7

Davis, Douglas Bradley. "Finite Element Modeling for Prediction of Low Frequency Floor Vibrations Due to Walking." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/28634.

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Floor vibration serviceability is a primary design consideration for steel framed floors. Designers in North America typically use the AISC Design Guide 11 methods to check this limit state, but its methods are difficult to apply to atypical floor framing. Finite element analysis is a logical choice for predicting vibration response to walking, but simplified designer-friendly procedures are not available. Three relatively simple, experimentally verified methods of predicting low frequency floor vibration due to walking are presented in this dissertation. The methods are based on finite el

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8

Gonoskov, Arkady. "Ultra-intense laser-plasma interaction for applied and fundamental physics." Doctoral thesis, Umeå universitet, Institutionen för fysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-84245.

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Rapid progress in ultra-intense laser technology has resulted in intensity levels surpassing 1022 W/cm2, reaching the highest possible density of electromagnetic energy amongst all controlled sources available in the laboratory. During recent decades, fast growth in available intensity has stimulated numerous studies based on the use of high intensity lasers as a unique tool for the initiation of nonlinear behavior in various basic systems: first molecules and atoms, then plasma resulting from the ionization of gases and solids, and, finally, pure vacuum. Apart from their fundamental importanc

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9

Said, Sylvere. "Mécanisme de dégradation de films de polypropylène imprégné sous champ électrique en présence d'oxygène." Université Joseph Fourier (Grenoble), 1994. http://www.theses.fr/1994GRE10047.

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Ce travail concerne le mecanisme de degradation de condensateurs moyenne tension au polypropylene impregne en presence d'oxygene. Cette etude a ete realisee sur des modeles de condensateurs en geometrie plane, avec des conditions experimentales (champ electrique alternatif compris entre 66 v/m-200 v/m, atmosphere d'oxygene, temperature de 80c) qui nous ont permis d'obtenir des resultats proches de la realite industrielle. Le vieillissement des condensateurs est essentiellement evalue par leur duree de vie et l'evolution des caracteristiques physico-chimiques du polymere et de l'impregnant. Le

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10

Söderqvist, Maria. "Social Media Reactions - An Empirical Study about the Shifting Communication Dynamics on Facebook." Thesis, Malmö högskola, Fakulteten för kultur och samhälle (KS), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:mau:diva-23950.

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Facebook is in the forefront when it comes to technical development and allowing new and faster communication opportunities. In this study, one of the latest technical additions on Facebook is being researched; namely the reaction-button. The aim of this paper is to understand the usage of the reaction-button as well as its impact on interpersonal communications, immediacy and speed in society. The research focuses on six different themes; Culture of Speed, Social acceleration, Space and time, Media richness, Immediacy as well as Telemediation. Empirical material have been collected through qu

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11

Tehrani, Najafian Foad [Verfasser], Thomas [Akademischer Betreuer] [Gutachter] Nugent, Werner [Gutachter] Nau, and Stephen [Gutachter] Connon. "From Cucurbiturils to Amino Acids: Taking Advantage of Mild Catalysis for Reaction Rate Acceleration and Pharmaceutical Drug Syntheses / Foad Tehrani Najafian ; Gutachter: Thomas Nugent, Werner Nau, Stephen Connon ; Betreuer: Thomas Nugent." Bremen : IRC-Library, Information Resource Center der Jacobs University Bremen, 2016. http://d-nb.info/1139892509/34.

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12

Adhikari, Sudip. "Accelerating the Computation of Chemical Reaction Kinetics for Modeling Turbulent Reacting Flows." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1510259399348102.

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13

Bergold, Sebastian Tobias [Verfasser], and Jürgen [Gutachter] Neubauer. "The process of alite hydration: Implications from quantitative phase analysis of Calcium-Silicate-Hydrate during hydration and from acceleration of the hydration reaction by mechanical activation / Sebastian Tobias Bergold ; Gutachter: Jürgen Neubauer." Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2016. http://d-nb.info/1124233946/34.

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14

Choony, Nandeo. "Steric acceleration of some pericyclic reactions." Thesis, University of Surrey, 1999. http://epubs.surrey.ac.uk/843609/.

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Steric effects are important in synthesis. Whilst steric hindrance is well known in hindering reactions, steric effects can also be employed to accelerate reactions, in particular cycloaddition reactions, and even to promote reactions that otherwise do not occur. A survey is included in previous work on steric effects in chemical reactions, principally cycloadditions. This includes a brief discussion on the importance of orientation and solvent effects on Diels-Alder cyclisations and ene reactions. The effect of substituents on the cyclisation of N-allyl furfurylamines has been studied. It was

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15

Colella, Diogo Artur Tocacelli. "Comportamento dos motoristas em interseções semaforizadas." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/18/18144/tde-07042008-085004/.

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Esta pesquisa caracterizou o comportamento de motoristas em interseções semaforizadas sob três aspectos: (1) reação frente à mudança do verde para o amarelo; (2) comportamento durante a desaceleração para parar; e (3) comportamento durante a saída do cruzamento semaforizado. Os dados foram coletados em uma interseção localizada em pista de testes no Virginia Tech Transportation Institute, nos EUA. A amostra foi composta por 60 motoristas voluntários igualmente divididos em função do gênero; dos quais 32 tinham idade inferior a 65 anos (\"jovens\"). Foram investigados efeitos da idade, do gêner

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16

Campbell, James Robert. "Recognition mediated control and acceleration of chemical reactions." Thesis, University of Birmingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364991.

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17

Walter, Christopher John. "Stereoselective acceleration of Diels-Alder reactions by synthetic enzymes." Thesis, University of Cambridge, 1994. https://www.repository.cam.ac.uk/handle/1810/272679.

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18

Bennes, Raphael Michel. "Recognition-induced control and acceleration of Diels-Alder cycloadditions." Thesis, University of Birmingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368517.

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19

Amar, Yehia. "Accelerating process development of complex chemical reactions." Thesis, University of Cambridge, 2019. https://www.repository.cam.ac.uk/handle/1810/288220.

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Process development of new complex reactions in the pharmaceutical and fine chemicals industries is challenging, and expensive. The field is beginning to see a bridging between fundamental first-principles investigations, and utilisation of data-driven statistical methods, such as machine learning. Nonetheless, process development and optimisation in these industries is mostly driven by trial-and-error, and experience. Approaches that move beyond these are limited to the well-developed optimisation of continuous variables, and often do not yield physical insights. This thesis describes several

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20

Bouin, Emeric. "Propagation de fronts structurés en biologie - Modélisation et analyse mathématique." Thesis, Lyon, École normale supérieure, 2014. http://www.theses.fr/2014ENSL0960/document.

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Cette thèse est consacrée à l'étude de phénomènes de propagation dans des modèles d’EDP venant de la biologie. On étudie des équations cinétiques inspirées par le déplacement de colonies de bactéries ainsi que des équations de réaction-diffusion importantes en écologie afin de reproduire plusieurs phénomènes de dynamique et d'évolution des populations. La première partie étudie des phénomènes de propagation pour des équations cinétiques. Nous étudions l'existence et la stabilité d'ondes progressives pour des modèles ou la dispersion est donnée par un opérateur hyperbolique et non par une diffu

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21

Soltesz, Douglas Brandon. "Use of (³He,n) Reactions to Constrain Nuclear Reaction Rates in the Hydrogen and Helium Burning Environments of Type-I X-ray Bursts." Ohio University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou161592153252756.

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22

Valentová, Veronika. "Bezpečnost provozu na pozemních komunikacích ve vztahu k jejich proměnným a neproměnným parametrům." Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-355634.

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Overtaking maneuver is very complex event influenced by many parameters. The most important parameters are vehicle performance, longitudinal slope, the speed at the beginning of the maneuver, the reaction time of the driver. Overtaking distance at CSN 73 6101 is determined on the basis of a simplified physical model. It considers constant speed of vehicles (overtaking and overtaken) and it does not consider a longitudinal gradient of road. This calculation is used for several decades and it is required to verify this procedure. That was the purpose of this work. Detailed physical model was per

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23

Blake, Jack. "Domain decomposition methods for nuclear reactor modelling with diffusion acceleration." Thesis, University of Bath, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.698988.

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In this thesis we study methods for solving the neutron transport equation (or linear Boltzmann equation). This is an integro-differential equation that describes the behaviour of neutrons during a nuclear fission reaction. Applications of this equation include modelling behaviour within nuclear reactors and the design of shielding around x-ray facilities in hospitals. Improvements in existing modelling techniques are an important way to address environmental and safety concerns of nuclear reactors, and also the safety of people working with or near radiation. The neutron transport equation ty

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24

ROSSI, PEDRO C. R. "Reações nucleares de alta energia ('Spallation') e sua aplicação em cálculo de sistemas nucleares acionados por fonte." reponame:Repositório Institucional do IPEN, 2011. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9965.

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Made available in DSpace on 2014-10-09T12:33:19Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:06:27Z (GMT). No. of bitstreams: 0<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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25

Woddi, Venkat Krishna Taraknath. "Reactor accelerator coupling experiments: a feasability study." Texas A&M University, 2005. http://hdl.handle.net/1969.1/3752.

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The Reactor Accelerator Coupling Experiments (RACE) are a set of neutron source driven subcritical experiments under temperature feedback conditions. These experiments will involve coupling an accelerator driven neutron source to a TRIGA reactor system in a subcritical configuration. The accelerator source will consist of a 40 MeV electron linear accelerator (LINAC) and a heavy metal target. The electrons from the accelerator produce bremsstrahlung radiation in the target which in turn produces a source of neutrons via photonuclear reactions. The available core at the The University of Texas a

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26

Koyama, Akira. "Acceleration of Electrochemical Reactions in Confined Nanospaces Caused by Surface-Induced Phase Transition." 京都大学 (Kyoto University), 2017. http://hdl.handle.net/2433/225589.

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27

Raave, DA. "The control and auxiliary equipment of the national accelerator centre precision = 1,5m scattering chamber." Thesis, Cape Technikon, 1987. http://hdl.handle.net/20.500.11838/1111.

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Thesis (Maters Diploma(Electrical Engineering)--Cape Technikon, Cape Town, 1987<br>A variable-energy separated sector cyclotron with a K value of 200 MeV as well as an 8 MeV solid pole injector cyclotron has been completed at the national Accelerator Centre complex at Faure. These accelerators will produce bith light-ion and heavy-ion beams for Nuclear Physics, Radiotherapy and Isotope production.

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28

Marquez, Damian Jose Ignacio. "Multilevel acceleration of neutron transport calculations." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19731.

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Thesis (M.S.)--Nuclear and Radiological Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: Stacey, Weston M.; Committee Co-Chair: de Oliveira, Cassiano R.E.; Committee Member: Hertel, Nolan; Committee Member: van Rooijen, Wilfred F.G.

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29

Haj, Tahar Malek. "High power ring methods and accelerator driven subcritical reactor application." Thesis, Université Grenoble Alpes (ComUE), 2017. http://www.theses.fr/2017GREAY004/document.

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Les accélération de faisceaux de forte puissance et le bombardement d'une cible de spallation permettent d'atteindre les flux requis pour application aux réacteurs sous-critiques pilotés par un accélérateur de particules (ADSR).Parmi les methodes d'acceleration, on trouve les accélérateurs circulaires, en particuler les FFAG et les cyclotrons. Le travail de cette these porte sur l'évaluation de ces methodes pour la production de faisceaux de protons de classe multi-mégawatts, y compris la participation à des collaborations d'études internationales de design. Une evaluation de la methode ADSR c

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30

D'Alessio, Giuseppe. "Data-driven models for reacting flows simulations: reduced-order modelling, chemistry acceleration and analysis of high-fidelity data." Doctoral thesis, Universite Libre de Bruxelles, 2021. https://dipot.ulb.ac.be/dspace/bitstream/2013/328064/5/contratGA.pdf.

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Combustion science must necessarily go through a deep process of innovation, as only improving the energy efficiency and the fuel flexibility it will be possible to mitigate the impact of the anthropogenic activities on the climate and the environment. Because of the strong relation that is observed in chemically reacting flows between the fluid-dynamic conditions and the chemical kinetics, the use of Computational Fluid Dynamics (CFD) simulations with detailed kinetic mechanisms represents the best tool to optimize and develop novel combustion systems. In fact, while the CFD provides for the

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31

White, Susan Marie 1973. "Beam characterization for accelerator-based boron neutron capture therapy using the ⁹Be(d,n) nuclear reaction." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50491.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1998.<br>Includes bibliographical references (leaves 62-65).<br>Use of the ⁹Be(d,n) nuclear reaction for accelerator-based boron neutron capture therapies (AB-BNCT) was investigated. The moderated neutron spectra produced at several deuteron bombarding energies were evaluated in terms of dose rates and dosimetric profiles in a water-filled brain phantom using an existing heavy water moderator and lead reflector assembly. Dosimetry results were obtained using the dual ionization chamber technique coupled with ba

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32

Worthy, Amanda D. "The Use of Reversible Covalent Bonding and Induced Intramolecularity to Achieve Selectivity and Rate Acceleration in Organic Reactions." Thesis, Boston College, 2013. http://hdl.handle.net/2345/3162.

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Thesis advisor: Kian L. Tan<br>Chapter 1. Catalytic directing group, I, which was designed with the ability to form a reversible covalent bond with a substrate and bind a metal, was shown to direct the hydroformylation of allylic amines. The efficient regioselective hydroformylation of a variety of 1,2-disubstituted allylic sulfonamides to form β-amino-aldehydes under mild conditions has been shown. Chapter 2. Building off of the successful application of I, enantioenriched catalytic directing group, II, was designed and synthesized. It retained the essential features to direct hydroformylatio

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33

Tygier, Samuel C. Tenzing. "High current proton fixed-field alternating-gradient accelerator designs." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/high-current-proton-fixedfield-alternatinggradient-accelerator-designs(ce718c72-3875-458f-92d2-1cd496287993).html.

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To make energy production sustainable and reduce carbon dioxide emissions it is necessary to stop using fossil fuels as our primary energy source. The Accelerator Driven Subcritical Reactor (ADSR) could provide safe nuclear power. It uses thorium as fuel, which is more abundant than uranium, and produces less long lived waste. An ADSR uses neutron spallation, caused by a high power proton beam impacting a metal target, to drive and control the reaction. The beam needs to have an energy of around 1 Ge V and a current of 10 mA with a very high reliability, the combination of which is beyond the

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34

Haupt, Robert A. "Structural Determination of Copolymers from the Cross-catalyzed Reactions of Phenol-formaldehyde and Polymeric Methylenediphenyl Diisocyanate." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/22025.

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This work reports the elucidation of the structure of a copolymer generated by the cross- catalyzed reactions of PF and pMDI prepolymers. The electronic behavior of phenolic monomers as perturbed by alkali metal hydroxides in an aqueous environment was studied with 1H and 13C NMR. Changes in electronic structure and thus reactivity were related to solvated ionic radius, solvent dielectric constant, and their effect on ion generated electric field strength. NMR chemical shifts were used to predict order of reactivity for phenolic model compounds with phenyl isocyanate with good success. As p

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35

Zhang, Youpeng. "Transmutation of Am in sodium fast reactors and accelerator driven systems." Doctoral thesis, KTH, Reaktorfysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-72427.

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In this thesis, the feasibility to use sodium cooled fast reactors loaded with MOX, metallic and nitride fuels for efficient transmutation of americium is investigated by performing transient analysis for cases with different americium contents in fuels, using safety parameters obtained with the SERPENT Monte Carlo code. It was then demonstrated that there is no solid limit for the Am introduction into oxide, metallic and nitride fuels that were loaded into sodium fast reactors. Instead, higher Am contents could be permitted if specific levels of power penalty were accepted. Transient analysis

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36

Kudchadker, Rajat. "Optimized accelerator based epithermal neutron beams for boron neutron capture therapy /." free to MU campus, to others for purchase, 1996. http://wwwlib.umi.com/cr/mo/fullcit?p9821332.

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37

Rodrigues, Cleber Lima. "Interferência coulombiana-nuclear no espalhamento inelástico de Dêuterons por ANTIPOT.99,101 Ru." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-14112013-121152/.

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Medidas inéditas de Interferência Coulombiana-Nuclear (ICN) nos núcleos ímpares ANTPOT.99,101 Ru complementam a investigação da coletividade da primeira excitação quadrupolar dos isótopos pares de Ru ao redor de A~100, com projéteis que interagem isoescalamente com núcleo. As distribuições angulares do espalhamento inelástico com dêuterons incidentes de 13 MeV, nos núcleos ímpares estáveis de rutênio, foram obtidas no sistema Acelerador Pelletron - Espectrógrafo Magnético Enge, utilizando emulsões nucleares no plano focal. Foram medidos espectros associados a catorze e dezesseis ângulos de esp

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Niemeyer, Kyle Evan. "Reducing the Cost of Chemistry in Reactive-Flow Simulations: Novel Mechanism Reduction Strategies and Acceleration via Graphics Processing Units." Case Western Reserve University School of Graduate Studies / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=case1378393709.

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39

Lee, Charles L. (Charles Leon) 1970. "The design of an intense accelerator-based epithermal neutron beam prototype for BNCT using near-threshold reactions." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50535.

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40

Morales, Gallegos Elia Lizeth. "Carbon burning in stars : an experimental study of the 12C(12C, p)23Na reaction towards astrophysical energies." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/28967.

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Fusion reactions between 12C nuclei are among the most important in stellar evolution since they determine the destiny of massive stars (> 8 M). At thermonuclear energies (Ecm=1.5 ± 0.3 MeV), the 12C+12C reactions mainly proceed through 20Ne+α and 23Na+p channels. Since these energies are much lower than the height of the Coulomb barrier (Ecm= 6.1 MeV), the direct measurements of the 12C+12C reactions are very challenging because of the extremely small cross sections involved and the high beam-induced background originating from impurities in the targets. In addition, the 12C+12C reaction form

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41

Scarduelli, Valdir Brunetti. "Efeitos de deformação e cluster no estudo de espalhamento elástico dos núcleos 10B e 10C em alvo de 58Ni." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-09112016-105849/.

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Esse trabalho consistiu na medida e análise de distribuições angulares do espalhamento elástico e inelástico para núcleos de massa A=10 em alvos de 58Ni e no desenvolvimento de novos feixes secundários radioativos para o sistema RIBRAS. As distribuições angulares do sistema 10B+58Ni foram medidas nas energias E(lab)= 19, 20, 21, 23, 24, 25 e 35 MeV, no laboratório Tandar na Argentina, enquanto a distribuição angular do sistema 10C+58Ni foi medida na energia E(lab)= 35.3 MeV, utilizando o sistema TWINSOL, da Universidade de Notre Dame, Estados Unidos. O formalismo de canais acoplados foi utiliz

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42

Bhattacharyya, Sampriti. "Reliability Analysis and Controls for Accelerator Driven Systems Based On Project X." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1343340152.

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43

Berglöf, Carl. "On measurement and monitoring of reactivity in subcritical reactor systems." Doctoral thesis, KTH, Reaktorfysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12483.

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Accelerator-driven systems have been proposed for incineration of transuranic elements from spent nuclear fuel. For safe operation of such facilities, a robust method for reactivity monitoring is required. Experience has shown that the performance of reactivity measurement methods in terms of accuracy and applicability is highly system dependent. Further investigations are needed to increase the knowledge data bank before applying the methods to an industrial facility and to achieve license to operate such a facility. In this thesis, two systems have been subject to investigation of various re

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ANTUNES, ALBERI. "Um estudo da fisica de sistemas multiplicativos subcriticos acionados por fontes e a utilizacao de codigos deterministicos no calculo destes sistemas." reponame:Repositório Institucional do IPEN, 2008. http://repositorio.ipen.br:8080/xmlui/handle/123456789/9362.

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Made available in DSpace on 2014-10-09T12:26:15Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:09:38Z (GMT). No. of bitstreams: 0<br>Dissertacao (Mestrado)<br>IPEN/D<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP

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Rossi, Pedro Carlos Russo. "Reações nucleares de alta energia (\" Spallation\") e sua aplicação em cálculo de sistemas nucleares acionados por Fonte." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/85/85133/tde-16062011-132603/.

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Neste trabalho apresentamos um estudo das reações nucleares de alta energia que são fundamentais na definição do termo fonte dos reatores nucleares subcríticos acionados por fonte externa. Estas reações nucleares, também conhecidas como \"spallation\", consistem na interação de hádrons de alta energia com os núcleons do núcleo atômico. A fenomenologia destas reações consiste em duas etapas, sendo que à primeira, o próton interage através de espalhamentos múltiplos, em um processo denominado cascata intra-nuclear seguido da etapa na qual o núcleo excitado oriundo da cascata intranuclear ou evap

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John, Robert. "Untersuchung von Gammakaskaden und Stärkefunktionen in der Neutroneneinfangsreaktion 77Se(n,γ)". Helmholtz-Zentrum Dresden-Rossendorf, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-146362.

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Eine der wichtigsten nuklearen Prozesse stellt der Neutroneneinfang dar. In der kosmischen Nukleosynthese (s-Prozess) schwerer Elemente werden Kerne mit Massenzahlen größer als die von Eisen (A = 56) produziert, welche durch Kernfusion nicht produziert werden können. Dabei fängt ein Kern ein Neutron ein, wird durch die frei werdende Bindungsenergie angeregt und kann sich anschließend unter Aussenden von Photonen (Gamma-Quanten) wieder abregen. Aus der Abregung über Gammastrahlung können Rückschlüsse auf die Struktur des aktivierten Nuklids gezogen werden. Im Rahmen dieser Arbeit werden die aus

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Anders, Michael. "S-factor measurement of the 2H(α,γ)6Li reaction at energies relevant for Big-Bang nucleosynthesis". Forschungszentrum Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-141091.

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For about 20 years now, observations of 6Li in several old metal-poor stars inside the halo of our galaxy have been reported, which are largely independent of the stars’ metallicity, and which point to a possible primordial origin. The observations exceed the predictions of the Standard Big-Bang Nucleosynthesis model by a factor of 500. In the relevant energy range, no directly measured S-factors were available yet for the main production reaction 2H(α,γ)6Li, while different theoretical estimations have an uncertainty of up to two orders of magnitude. The very small cross section in the picoba

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Pires, Kelly Cristina Cezaretto. ""MEDIDAS DE ESPALHAMENTO ELÁSTICO RESSONANTE 17O + p&quot." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-25072006-162033/.

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Foram medidas distribuições angulares do espalhamento elástico 17O + p e da reação de transferência p(17O,a)14N nas energias ECM = 1,39 e 2,33 MeV. Foi utilizado feixe de 17O produzido no Laboratório Pelletron, com energias de 25 e 42 MeV. As medidas foram efetuadas utilizando-se alvos plásticos de mylar aluminizado (C10H10O4) e polietileno (CH2) com espessuras de 354µg/cm² e 6mg/cm², respectivamente. As distribuições angulares experimentais do espalhamento elástico e da reação de transferência foram analisadas por cálculos de Modelo Óptico e Aproximação de Born de Ondas Distorcidas (DWBA), am

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Anders, Michael. "S-factor measurement of the 2H(α,γ)6Li reaction at energies relevant for Big-Bang nucleosynthesis". Helmholtz-Zentrum Dresden-Rossendorf, 2013. https://hzdr.qucosa.de/id/qucosa%3A22184.

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For about 20 years now, observations of 6Li in several old metal-poor stars inside the halo of our galaxy have been reported, which are largely independent of the stars’ metallicity, and which point to a possible primordial origin. The observations exceed the predictions of the Standard Big-Bang Nucleosynthesis model by a factor of 500. In the relevant energy range, no directly measured S-factors were available yet for the main production reaction 2H(α,γ)6Li, while different theoretical estimations have an uncertainty of up to two orders of magnitude. The very small cross section in the picoba

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Zevallos, Erick Oscar Natividad. "Investigação do espalhamento elástico do núcleo radioativo 12B em um alvo de 58Ni." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-24092018-200026/.

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No presente trabalho medimos e analisamos distribuições angulares para o processo de espalhamento elástico do núcleo radioativo de 12B em alvo de 58Ni. As medidas foram realizadas nas energias de Elab=30.0 e 33.0 MeV no laboratório do acelerador Pelletron. Essas energias são próximas a barreira Coulombiana (VB=28.0 MeV) para esse sistema. Para a produção do feixe radioativo de 12B utilizamos o sistema RIBRAS instalado nesse laboratório. As distribuições angulares foram analisadas com o modelo ótico, utilizando potenciais de Woods-Saxon e Potencial de São Paulo. Para uma interpretação física ma

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