Дисертації з теми "Radiation studies"
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Sotthibandhu, Sakuntala. "Radiation damage studies of silicon detectors." Thesis, Imperial College London, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339072.
Повний текст джерелаLangley, Ruth E. "Radiation-induced apoptosis : in vitro studies." Thesis, University of Nottingham, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.387684.
Повний текст джерелаKrishnamurthy, Satheesh. "Synchrotron radiation studies of nanostructured materials." Thesis, University of Newcastle Upon Tyne, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.430334.
Повний текст джерелаParis, Mark V. "Model studies of solar spectral irradiance at the bottom and top of a cloudy atmosphere." Diss., Georgia Institute of Technology, 1985. http://hdl.handle.net/1853/16900.
Повний текст джерелаLa, Rosa Francesco. "Studies on ToF-PET using Cherenkov radiation." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/9543/.
Повний текст джерелаWeaver, Jill Suzanne. "Synchrotron Radiation Studies of Magnetic Thin Films." Thesis, University of York, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.485147.
Повний текст джерелаGray, D. E. "Studies of radiation in cloudy atmosphere£s." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379984.
Повний текст джерелаAl-Hakim, M. M. R. "Radiation chemical and spectroscopic studies of lipoxygenase." Thesis, University of Salford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372141.
Повний текст джерелаThompson, Stephen P. "Studies of cosmic dusts using synchrotron radiation." Thesis, Keele University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303876.
Повний текст джерелаWright, Andrew Edward. "Studies of reactive intermediates with synchrotron radiation." Thesis, University of Southampton, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242644.
Повний текст джерелаMartis, V. "Synchrotron radiation studies of multicomponent metal oxides." Thesis, University College London (University of London), 2012. http://discovery.ucl.ac.uk/1388216/.
Повний текст джерелаMulroy, Louise. "Pulsed radiation studies of photo-protective systems." Thesis, Keele University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388948.
Повний текст джерелаLiu, Wenqing. "Synchrotron radiation studies of spintronic hybrid systems." Thesis, University of York, 2014. http://etheses.whiterose.ac.uk/8180/.
Повний текст джерелаMelero, García Emilio. "Fragmentation studies of small molecules using synchrotron radiation." Licentiate thesis, KTH, Physics, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1697.
Повний текст джерелаThis thesis presents experimental data on the fragmentationof gas phase sulfur hexafluoride (SF6) and deutheromethane(CD4) molecules after their interaction with synchrotronradiation in the energy range of 70-200 eV. The data wasobtained using coincidence spectroscopy between energy resolvedelectrons and ions (EREICO).
Degradation of the molecular bond upon selective ionizationof different molecular orbitals has been studied by measuringionic fragments in coincidence with energy selected electrons.Besides the direct ionisation of the orbitals also the indirectprocess, in which the hole is created by the decay of a highlyenergetic core-excited state, was studied. The differencesdetected in the fragmentation after the direct and indirectionisation of a selected orbital can be related, in some cases,with the relaxation of the nuclei in the potential energysurface of the core excited state during its lifetime, thusproviding information on the neutral core excited state.
An experimental set-up capable of photon inducedfluorescence spectroscopy (PIFs) studies of core excitedmolecules in the visible range has been constructed. Thistechnique can yield complementary information to the EREICOdata about the energy distribution in the fragmentation sincethe internal energy of excited emitted fragments that decay inthe visible can be measured. It also allows the detection ofpossible neutral fragments.
Bao, Zhuo. "Synchrotron Radiation Studies of Free and Adsorbed Molecules." Doctoral thesis, Uppsala University, Surface and Interface Science Division, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8610.
Повний текст джерелаThis thesis contains two parts. The first part concerns the research work on free molecules using synchrotron-radiation-related techniques. Auger electron spectra of two free open-shell molecules, O2 and NO, were studied experimentally and theoretically. Photoionization experimental technique with tunable synchrotron radiation source was used to induce core-level electron ionization and obtain the KVV normal Auger electron spectra. A quantitative assignment of O2 normal Auger spectrum was obtained by applying ab initio CI calculations and LVI Auger line shape simulations including the bond length dependence of Auger transition rates. The photon energy dependence of normal Auger electron spectra was focused on with photon energies in the vicinities of core-ionization threshold energies. Consequently, the MAPCI (Molecular Auger Post Collision Interaction) theory was developed. Taking the near-threshold O2 normal Auger spectrum as an example, the two extreme cases of MAPCI effect, “atomic-like PCI” and “molecular PCI”, were discovered and discussed. The effect of shape resonance on near-threshold molecular normal Auger spectrum was discussed taking NO near threshold normal Auger spectra as example.
The second part deals with research work on the chemisorption of small epoxy organic molecules, ethylene oxide, methyl oxirane, on Si (100) surfaces. Synchrotron radiation related techniques, UPS, XPS and NEXAFS, were applied. Based on the valence photoemission spectra, C 1s and Si 2p XPS spectra, the epoxy ring opening reactions of these molecules in chemisorption process were proved. Further tentative search for the surface-adsorbate CDAD effect was performed, and no evident circular dichroism was confirmed.
Walker, Christina Helen. "Monte Carlo radiation transfer studies of protoplanetary environments /." St Andrews, 2007. http://hdl.handle.net/10023/218.
Повний текст джерелаRobinson, P. T. "Magnetic resonance studies of radiation processes in quartz." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355772.
Повний текст джерелаWalker, Christina H. "Monte Carlo radiation transfer studies of protoplanetary environments." Thesis, University of St Andrews, 2007. http://hdl.handle.net/10023/218.
Повний текст джерелаHope, S. "Spin polarised radiation studies of ultrathin magnetic films." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604219.
Повний текст джерелаMyles, Dean Aubrey Albert. "Synchrotron X-radiation studies of C-reactive proteins." Thesis, Keele University, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305880.
Повний текст джерелаMorgan, Andrew Gordon. "Studies of final state photon radiation at LEP." Thesis, Durham University, 1994. http://etheses.dur.ac.uk/5952/.
Повний текст джерелаEypper, Marie. "Photoionisation studies of reactive intermediates with synchrotron radiation." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/191337/.
Повний текст джерелаBailet, Gilles. "Radiation and ablation studies for in-flight validation." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLC008.
Повний текст джерелаUnveiling the mysteries of the solar system to understand the mechanisms of Earth’s formation, to search for signs of life, or to develop settlements on other planets, depends on our abilities to push the limits of engineering and science. One of the key aspects of space exploration is the development of advanced technologies to sustain the entry/reentry phase. During entry or reentry, the spacecraft may be exposed to intense radiative fluxes that cannot be accurately predicted yet, thus imposing high safety margins on the design of thermal protection systems. These uncertainties rise when the heat shield is made of an ablative material as its degradation introduces new chemical species reacting with the flow affecting radiation processes. The goal of this thesis is to study the radiative heat fluxes onto a small size reentry vehicle in the presence of an ablative TPS, using numerical simulations and experiments to develop a flight instrument that will be carried onboard the QARMAN CubeSat.An assessment of the reentry trajectory of the 5-kg QARMAN vehicle was performed using a custom 6-degree of freedom code. An extensive set of Monte Carlo simulations allowed to quantify uncertainties and showed a maximum of ±15% deviation from the nominal trajectory. The spectra without ablation were then computed using a decoupled approach with two codes: Stagline (VKI) and SPECAIR (EM2C, CentraleSupélec). These simulations were performed for the nominal trajectory as well as for the range of uncertainties. They showed a nonlinear behavior of the spectral features deviations from nominal with a drastic increase toward the end of the mission.The effects of ablation were studied with a new measurement technique developed during this thesis. Based on two radiation measurement probes, one cooled and the other with an ablative surface, it allows to quantify the emission and absorption induced by any kind of TPS having gas-surface interactions with the flow, provided that the radiative emission or absorption features of the ablative species do not fully overlap. The method was validated on a graphite TPS sample. It was then applied to determine the radiation expected during the QARMAN mission (Cork P50 TPS). This study also allowed to select an emission spectrometer (350-800 nm range for a 68-g mass).A standard radiation instrument was tested and the limits of this device shown. On those lessons learned, two new technologies were developed and an emission spectrometer payload (INES) was built and integrated into the QARMAN reentry CubeSat. A dedicated spectral and thermal calibration was also developed to maximize the quality of the scientific return by tackling the non-standard internal temperature variations of QARMAN’s payload bay.Relying on two inventions made during this study, the apparatus is at the time of writing, the only non-intrusive payload capable of making radiative measurements without limitations due to ablation dust contamination. The instrument can also provide measurements of recession, sublimation and swelling of the TPS with a precision of at least 0.2 mm. Operation of the apparatus was demonstrated for a wide variety of test conditions, including different enthalpy profiles, gas mixtures and TPS materials
Damet, Jerome. "Physics and Detector Simulation Studies of B-Meson Decays in ATLAS." Doctoral thesis, Uppsala University, Department of Nuclear and Particle Physics, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-1284.
Повний текст джерелаBall, Stephen M. "Studies of laser photolysis." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294334.
Повний текст джерелаÁlvarez, Ruiz Jesús. "Photon induced fluorescence studies of molecules using synchrotron radiation." Licentiate thesis, KTH, Physics, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1567.
Повний текст джерелаThis Licentiate thesis presents research accomplished at theSection of Atomic and Molecular Physics at the Royal Instituteof Technology in Stockholm using photon induced fluorescencespectroscopy (PIFS) during the last two years.
The main results presented are summarized:
- Neutral photodissociation in CO was observed aftersynchrotron photon excitation in the range 19-26 eV bycollecting dispersed fluorescence from excited neutral C atoms.Follow-up ab initio calculations point out CO Rydberg seriesconverging to the CO+ C and D states as precursors.
- The branching ratio between N2 + (B-X)(v=1,v=2) and (v=0,v=1)transitions in the 20-46 eV energy range reveals strongnon-Franck-Condon effects. Ab initio calculations indicate thatthe autoionization of certain superexcited states areresponsible for some of the structures present in the branchingratio curve, confirming the important role of non-Rydbergdoubly excited resonant states (NRDERS) in de-excitationprocesses above the ionization potential.
- Photon induced neutral dissociation processes in NO arereported. Neither Rydberg series nor other molecular states inNO known so far can account for the collected data. From abinitio calculations more information regarding the NO precursorstates and the mechanism behind the observed neutraldissociation were obtained.
- The details of a new experimental set-up for gas phasefluorescence measurements using synchrotron radiation aredescribed. It is able to perform simultaneous measurements ofdispersed and total fluorescence in the visible range. Thefirst results obtained with this set-up are presented,concerning fluorescence after excitation of the N2 molecules inthe N 1s edge.
These four studies conform the set of papers enclosed in theLicentiate thesis.
Finally a pre-study to further apply PIFS to speciespreviously excited by microwave discharge is included as futureplans.
Davies, Robert. "Methods development and radiation damage studies in macromolecular crystallography." Thesis, University of Oxford, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.491362.
Повний текст джерелаStudniarek, Michal. "Interface and multifunctional device spintronics : studies with synchrotron radiation." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAE028/document.
Повний текст джерелаMultifunctional spintronics is a new direction of advancement beyond the limits of modern electronics. By combining elementary charge of an electron and its spin, it aims to develop devices which would be sensitive to more than one stimuli and/or have multiresponse signal. In this thesis, we explore the multifunctional potential emerging while combining spin electronic and organic systems to pave the way towards multipurpose devices. First, we study formation of a ferromagnetic/organic spinterface in Co/manganese-phthalocyanine system. We propose introduction of intrinsic multifunctionality by using spin crossover materials. We develop a novel functionalization approach for tuning their properties towards device applications. We propose an external functional control over any hybrid spinterface by using multiferroic substrate. In the framework of this thesis, a Versatile Variable Temperature Insert was developed at the DEIMOS beamline of the SOLEIL synchrotron. We demonstrate how it can be used to probe active atoms in any microelectronic device
Murray, James. "Structural studies of neuraminidases and x-ray radiation damage." Thesis, University of Oxford, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.418151.
Повний текст джерелаEadie, Ewan David. "Studies to Target Optical Radiation Dosimetry Needs in Healthcare." Thesis, University of Dundee, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.500625.
Повний текст джерелаEvans, A. M. "Studies of plasmas produced by high power laser radiation." Thesis, Swansea University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636936.
Повний текст джерелаBurke, Marc. "Pulsed radiation studies of carotenoid radicals and excited states." Thesis, Keele University, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.482117.
Повний текст джерелаRule, Robert J. "Studies related to crystal growth using synchrotron radiation diffraction." Thesis, University of Liverpool, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.291738.
Повний текст джерелаCharalambides, Stelios Nicolaou. "Remote sensing studies of Antarctica using radiation budget measurements." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37655.
Повний текст джерелаHandrup, Karsten. "Synchrotron radiation based studies of complex molecules on surfaces." Thesis, University of Nottingham, 2014. http://eprints.nottingham.ac.uk/13988/.
Повний текст джерелаTaheri, Faissal Bakkali. "Numerical and experimental studies of coherent Smith-Purcell radiation." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:d483c501-ba46-4e08-9d38-5af29211aedc.
Повний текст джерелаHaley, Benjamin. "How Protraction Moderates Radiation Risk in Animal Mortality Studies." Thesis, Northwestern University, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10258166.
Повний текст джерелаRadiation is a ubiquitous health risk. Contemporary populations are exposed to several hundred milliSieverts per person over their lifetimes from both natural and human made sources such as radon, cosmic rays, CT-scans, etc. Risk estimates based on studies of atomic bomb survivors suggest that these exposures induce excess cancer mortality at a rate of several percent per Sievert.
To develop accurate risk estimates, it is important to recognize that contemporary exposures are different than atomic bomb survivor exposures. Instead of a single acute high dose rate exposure from an atomic explosion, populations today experience many small, protracted exposures accumulating to moderate total doses over their lifetimes. Therefore, in order to estimate the risk of contemporary exposures using atomic bomb survivor data, it is important to determine the differences in radiation dose response following acute vs. protracted exposures.
The committee to estimate the biological effects of ionizing radiation exposure in humans (BEIR) is one of the central authorities in the United States tasked with estimating radiation risk. Their seventh and most recent report (BEIR VII) written in 2006 estimated that contemporary protracted exposures induce 1.5 fold less risk than atomic bomb survivor exposures.
The work presented in this dissertation leverages a large body of historical animal mortality data to argue that BEIR VII overestimates the risk of protracted exposures. Concretely, evidence is presented from animal exposures that support the concept that contemporary protracted exposures induce about 2 fold less risk than atomic bomb survivor exposures.
Bangert, D. E. "Computational studies of gratings." Thesis, University of Cambridge, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.344034.
Повний текст джерелаClingen, Peter H. "Biochemical studies of purine photodamage in DNA." Thesis, Queen's University Belfast, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.241386.
Повний текст джерелаOzols, Agris. "Low-dose studies of genomic instability-mechanisms and targets." Thesis, Queen Mary, University of London, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.271260.
Повний текст джерелаNguti, N. D. "Laue and anomalous diffraction studies in synchrotron radiation protein crystallography." Thesis, Keele University, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.295803.
Повний текст джерелаThurston, Gavin O. "Studies on the effect of radiation on 3T3 cell motility." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/29441.
Повний текст джерелаScience, Faculty of
Physics and Astronomy, Department of
Graduate
MacManus, Liam Francis. "Surface modification studies of polypropylene using ultraviolet radiation and ozone." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ32497.pdf.
Повний текст джерелаLee, SangKyu. "Image-based dose correlation studies on radiation- induced lung injury." Thesis, McGill University, 2011. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=97013.
Повний текст джерелаLe but de ce travail est de développer un outil automatisé de haute précision permettant d'evaluer la réponse de tissus de poumons sains à la radiothérapie (RT), ainsi que leurs corrélation avec la dose locale. Les complications de tissus de poumons sains induites par RT peuvent être mesurées à l'aide des manifestations de maladies pulmonaires induites par radiations (MPIR) en radiographie. Le suivi des images CT par des cellules de poumons cancéreuses provenant de la RT a été enregistré à leur image CT de planication correspondante. à l'aide du suivi de la calibration de l'intensité de l'image, l'etendue des MPIR a été segmentée en se basant sur le changement de densité physique durant la période de suivi. La dose reliée à la segmentation des MPIR et aux tissus de poumons sains a été calculée en se basant sur des planications de traitements établis. La réponse des tissus sains en termes de volume MPIR et la réponse de la dose locale ont démontrées une dépendance signicative par rapport aux patients et aux périodes de suivi. Le calcul de dose par simulations Monte-Carlo sest révélé être important an d'obtenir de meilleures corrélations. En tenant compte de l'amélioration de l'exactitude des calibrations CT et des enregistrements d'image, cet outil peut faciliter le déroulement des futures études de toxicité des tissus sains.
Clegg, R. "Radiation-chemical studies of some sulphophthalocyanine complexes and vitamin B12." Thesis, University of Salford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374501.
Повний текст джерелаBebb, Andrew M. "Synchrotron radiation studies of spin-polarised electron momentum density distributions." Thesis, University of Warwick, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404845.
Повний текст джерелаMaginn, Stephen James. "Applications of synchrotron radiation Laue diffraction in molecular structure studies." Thesis, University of Liverpool, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.253418.
Повний текст джерелаYang, Chenxing. "Simulation studies of liquids, supercritical fluids and radiation damage effects." Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/24858.
Повний текст джерелаCelik, Murat. "Experimental and computational studies of electric thruster plasma radiation emission." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40306.
Повний текст джерелаThis electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (p. 231-239).
Electric thrusters are being developed for in-space propulsion needs of spacecraft as their higher specific impulse enables a significant reduction in the required propellant mass and allows longer duration missions. Over the last few decades many different electric propulsion concepts have been proposed and studied. In studying the electric thrusters, in order to improve the thruster performance as well as to understand the underlying physics of thruster's operation, various diagnostics methods were employed. As one unique method, emission spectroscopy provides a non-invasive, fast and economical diagnostic allowing also the ability to access hard to reach locations. In this study, emission spectroscopy is employed as a means to determine the trends in thruster operations as well as diagnosing the plasma parameters. This study presents the spectral measurement results of three different electric thrusters and plasma sources. First, the BHT-200 Hall thruster emission spectra measurements are presented for varying discharge voltage and for various regions of observation.
(cont.) Second, spectral measurements of a TAL type laboratory mini-Hall thruster, MHT-9, were presented. Third, radiation emission measurements of an experimental Helicon plasma source being studied to assess the possibility of using Helicon discharge as a propulsive system are presented and the trends are discussed. Two collisional-radiative (C-R) models are developed for Argon and Xenon plasmas to analyze the experimental spectra. In the C-R models, electron induced excitation, deexcitation and ionization collisions, and spontaneous radiative de-excitation transitions are simulated for neutral and singly charged ion species. The models are validated against measured spectra obtained using different experimental setups. The BHT-200 Hall thruster has insulator ceramic annular walls made of Boron-Nitride (BN). Erosion of ceramic walls is one of the major life limiting factors for Hall thrusters. Emission spectroscopy is used as a means to determine the trends in the thruster wall erosion rate by measuring the radiation emission of the Boron neutral 249.68nm and 249.77nm lines. Discussion about the spectral measurements and relevant analysis are presented.
by Murat Çelik.
Ph.D.
Trachenko, Kostyantyn Oleksiyovich. "Simulation studies of silica glass dynamics and radiation damage effects." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620962.
Повний текст джерела