Dissertations / Theses on the topic 'Irradiative'
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OKA, TOHRU, TOSHIO KANEDA, MINORU UEDA, and YASUNORI SUMI. "Effects of Irradiation on Grafted Skin : Vascular Changes after Irradiation." Nagoya University School of Medicine, 1985. http://hdl.handle.net/2237/17473.
Full textMisner, Scottie, Carol Curtis, and Evelyn Whitmer. "Irradiation of Food." College of Agriculture and Life Sciences, University of Arizona (Tucson, AZ), 2008. http://hdl.handle.net/10150/146430.
Full textRevised version of 1999 title by Meer and Misner
Food irradiation is the treatment of food by a certain type of intense energy known as ionizing radiation. This involves exposing bulk or packaged food to carefully controlled amounts of energy. Food does not come in contact with radioactive material. The publication discusses the technology of food irradiation including; the energy source, effect on foods, identifying treated foods, environmental concerns and approved uses in the U.S.
Auvray, Marie-Hélène. "Endommagement sous irradiation de l'aluminate de lithium γ-LiALO₂." Paris 11, 1987. http://www.theses.fr/1987PA112381.
Full textAitkaliyeva, Assel. "Irradiation Stability of Carbon Nanotubes." [College Station, Tex. : Texas A&M University, 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-3251.
Full textDubé, Frédéric. "Spiral irradiation in stereotactic radiosurgery." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0016/MQ55049.pdf.
Full textDubé, Frédéric 1973. "Spiral irradiation in stereotactic radiosurgery." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=29884.
Full textA study of the beam distribution characteristics for the clinical linac-based radiosurgical techniques is presented. Two spiral linac-based radiosurgical techniques are developed: the uniform dose-rate spiral irradiation and the dose-rate-weighted spiral irradiation. Both exhibit the same spiraling beam entry trace over the patient's head; however, they differ in their beam distribution along the spiral. The dose-rate-weighted spiral irradiation provides a uniform beam distribution over the 2pi solid angle available in radiosurgery.
The currently existing techniques and the spiral techniques are then compared using the cumulative dose-volume histogram (CDVH) tools available with the McGill Treatment Planning System (MPS). The dose-rate-weighted spiral technique leads to lower dose inhomogeneities within the target volume and better dose conformity within the target. Moreover, it also encompasses smaller volumes of tissue at all isodose levels with larger differences at low isodose levels. A conclusion is reached that the dose-rate-weighted spiral irradiation technique offers interesting advantages over the currently used clinical linac-based techniques.
Shaibani, S. J. "Electron irradiation damage of spinal." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.371580.
Full textGelbart, W. "Bulk liquid-metal irradiation system." Helmholtz-Zentrum Dresden - Rossendorf, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-165893.
Full textBooi, Mlamli. "Ore sorting using microwave irradiation." Master's thesis, University of Cape Town, 1989. http://hdl.handle.net/11427/8336.
Full textAutomatic ore sorting machines are in common use in the mining industry. These machines generally separate valuable mineral-bearing rocks from waste rocks. At the Premier Diamond Mine in South Africa kimberlite, a diamond-bearing rock is separated from gabbro which is a waste rock. Work had been conducted previously in the Department of Electrical Engineering at the University of Cape Town to find a viable method for discriminating between gabbro and kimberlite. A technique using microwave irradiation attenuation was successful when using parallel-sided smooth-surfaced rocks. This technique used linearly polarized square antennas at 35GHz. Problems were experienced, however, with irregu1arly shaped rock s. The aim of the present study was therefore to deve1op a technique which will sort irregularly shaped rocks and eliminate the problems associated with them.
Mercer, Sean R. "Rock differentiation using microwave irradiation." Master's thesis, University of Cape Town, 1987. http://hdl.handle.net/11427/9638.
Full textThis project arose as a result of inefficiencies in the diamond recovery process at Premier Mine. A considerable amount of barren waste rock, gabbro, is mined along with the diamond bearing kimberlite. No automated method exists for separating the kimberlite from the waste rock and a device was required to effect ore sorting on a rock by rock basis. Experimentation with a microwave oven indicated that samples of kimberlite were more attenuative than samples of gabbro. The possibility of using microwave heating for rock differentiation was investigated but was impractical to implement. A study of low power microwave attenuation and reflection measurements was undertaken. Reflection measurements were found to be impractical due to the similar amounts of reflected signal from the different rock types. Microwave signal attenuation through rock samples was studied over a broad frequency spectrum. A detectable difference in signal attenuation was found through the gabbro and kimberlite. The difference in signal attenuation increased with increasing frequency. Different techniques to implement signal attenuation measurements through rock samples were investigated. The passing of rock samples through waveguide structures was found to be impractical in this application. Microwave signal attenuation measurements were successful when rock samples were placed between a transmitting and a receiving antenna. Equipment was designed and constructed with an operating frequency of 35GHz chosen due to the small antenna aperture area and the large attenuation difference at this frequency. Static measurements with this equipment revealed the problems with signal scattering and reflection from some irregularly shaped samples of low loss gabbro. The importance of these phenomenon could only be gauged from dynamic measurements. Dynamic measurements were performed using a laboratory test system with a conveyor belt capable of moving at speeds of up to 5 m/s. It was found that 93% of the kimberlite could be correctly detected whilst rejecting 67% of the gabbro. The system functioned satisfactorily and led to the filing of several patents.
Réjasse, Barbara. "Biocatalyse sous irradiation micro-ondes." La Rochelle, 2005. http://www.theses.fr/2005LAROS141.
Full textIn this study, we have used the microwave irradiation as energy source to carry out various biosynthesis catalysed by β-galactosidases or Candida antarctica lipase B. The influence of this alternative heating mode on the enzymatic activity and stability is studied. Three types of reactional media (aqueous highly concentrated in substrates, without solvent and with organic solvent) are tested for the implementation of biocatalysts under microwave irradiation. In each case, the reactional profile obtained is compared with that observed under traditional heating (convection), at the same macroscopic temperature. In aqueous medium, a transgalactosidation reaction is studied at 40°C. The initial rate of reaction, the reactional equilibrium and the rate of secondary hydrolysis are identical under both heating modes. In organic medium, the alcoholysis of ethyl butyrate and butanol catalyzed by Candida antarctica lipase B (free and immobilized form) is studied in a solvent free system and in various solvents (logP ranging between -0,15 and 3,29). In solvent free system, the heating mode doesn't have any effect on the initial rate and reactional equilibrium of the alcoholysis, from 40 to 100°C. In solvent system, the initial rate of the reaction increases by an 1,8-factor under microwave irradiation, while identical reactional equilibrium is obtained under both heating modes. The acceleration factor of the reaction under irradiation seems not to depend on the solvent polarity. The lipase stability in storage in butanol or ethyl butyrate is influenced by the heating mode. The process of enzymatic inactivation can be slowed down or accelerated in the electromagnetic field, according to the temperature of incubation
Giamarchi, Philippe. "Contribution à l'analyse des produits de radiolyse des lipides : applications en agro-alimentaire." Aix-Marseille 3, 1993. http://www.theses.fr/1993AIX30024.
Full textOno, Yuka. "Dosimetric advantages afforded by a new irradiation technique, Dynamic WaveArc, used for accelerated partial breast irradiation." Kyoto University, 2020. http://hdl.handle.net/2433/253145.
Full textQuentin, Alexis. "Modifications structurales de spinelles sous irradiation." Phd thesis, Université de Caen, 2010. http://tel.archives-ouvertes.fr/tel-00549397.
Full textBauer, Cletus P. "Electron irradiation n type cadmium telluride." Thesis, Monterey, California. Naval Postgraduate School, 1985. http://hdl.handle.net/10945/21306.
Full textOgilvy-Stuart, Amanda Lesley. "Endocrine sequelae of irradiation in childhood." Thesis, University of Southampton, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296367.
Full textTitapiwatanakun, V. "Pharmaceutical applications of CO2 laser irradiation." Thesis, University College London (University of London), 2016. http://discovery.ucl.ac.uk/1474179/.
Full textSchuller, Bradley W. "Selective irradiation of the vascular endothelium." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/44787.
Full text"September 2007."
Includes bibliographical references.
We developed a unique methodology to selectively irradiate the vascular endothelium in vivo to better understand the role of vascular damage in causing normal tissue radiation side-effects.The relationship between vascular endothelial cell apoptosis and intestinal crypt stem cell death was evaluated using uniform whole-body and selective vascular irradiation techniques. Mice received whole-body epithermal neutron beam irradiation. Additional dose was selectively targeted to endothelial cells from the short-ranged (5-9 [mu]m) particles released from neutron capture reactions in 10B confined to the blood by incorporation into 70-90 nm-diameter liposomes. Mice also received uniform photon doses above and below the threshold for death from the gastrointestinal (GI) syndrome. When plotted versus neutron beam dose, the crypt microcolony assay showed the same dose response for both the neutron beam-only and neutron beam plus boronated liposome groups. The added dose selectively delivered to the microvasculature did not cause any additional crypt loss. Jejunal cross-sections were prepared 4 hrs after irradiation and stained with TUNEL to observe and score apoptotic cells in the villus lamina propria. To uniquely identify the type of cell undergoing apoptosis in the lamina propria, intestinal specimens from various mice in the TUNEL studies were sectioned and stained with Meca-32 to identify endothelial cells and caspase-3 to identify apoptotic cells and visualized using dual-fluorescence microscopy. The TUNEL data showed a low level (~2 apoptotic cells per villus) of apoptosis in the lamina propria for both the uniform (photon or neutron) and selective vascular irradiation conditions that was independent of the administered dose.
(cont.) The dual-fluorescence studies indicated that most apoptotic bodies in the lamina propria were not endothelial cells but, rather, apoptotic leukocytes. These data demonstrate that there is no causal relationship between vascular endothelial cell apoptosis and crypt stem cell death in the mouse small intestine.
by Bradley W. Schuller.
Ph.D.
Holtom, Philip Derek. "Irradiation studies of astrophysical ice analogues." Thesis, University College London (University of London), 2005. http://discovery.ucl.ac.uk/1444790/.
Full textSobie, Cameron. "Prediction of irradiation hardening in metals." Diss., Georgia Institute of Technology, 2016. http://hdl.handle.net/1853/54963.
Full textHanif, Imran. "Ion irradiation modification of silicon nanowires." Thesis, University of Huddersfield, 2017. http://eprints.hud.ac.uk/id/eprint/32630/.
Full textSibuyi, Praise. "Irradiation induced effects on 6h-SIC." University of the Western Cape, 2012. http://hdl.handle.net/11394/8467.
Full textThe framework agreement in the year 2000 by the international community to launch Generation IV program with 10 nations, to develop safe and reliable nuclear reactors gave rise to the increased interest in the studies of SiC and the effect of different irradiations on solids. Silicon carbide is a preferred candidate used in harsh environments due to its excellent properties such as high chemical stability and strong mechanical strength. The PBMR technology promises to be the safest of all nuclear technology that have been developed before. SiC has been considered one candidate material being used in the fabrication of pebble bed fuel cell. Its outstanding physical and chemical properties even at high temperatures render it a material of choice for the future nuclear industry as whole and PBMR in particular. Due to the hostile environment created during the normal reactor operation, some of these excellent properties are compromised. In order to use this material in such conditions, it should have at least a near perfect crystal lattice to prevent defects that could compromise its strength and performance. A proper knowledge of the behavior of radiation-induced defects in SiC is vital. During irradiation, a disordered crystal lattice occurs, resulting in the production of defects in the lattice. These defects lead to the degradation of these excellent properties of a particular material. This thesis investigates the effects of various radiation effects to 6H-SiC. We have investigated the effects of radiation induced damages to SiC, with a description of the beds and the importance of the stability of the SiC-C interface upon the effects of radiations (y-rays, hot neutrons). The irradiated samples of 6H-SiC have been studied with various spectroscopic and structural characterization methods. The surface sensitive techniques such as Raman spectroscopy, UV-Vis, Photoluminescence and Atomic Force Microscopy will be employed in several complimentary ways to probe the effect of irradiation on SiC. The obtained results are discussed in details.
Rana, Aman. "Optimizing Weed Management via Microwave Irradiation." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/75115.
Full textPh. D.
Torchy, Séverine. "Transfert d'hydrogène sous irradiation micro-ondes." Lille 1, 2000. http://www.theses.fr/2000LIL10069.
Full textAKAMATSU, JOUSSET MARIELLE. "Evolution structurale d'alliages ferritiques sous irradiation." Paris 11, 1994. http://www.theses.fr/1994PA112007.
Full textQuentin, Alexis. "Modifications structurales de spinelle sous irradiation." Caen, 2010. http://www.theses.fr/2010CAEN2059.
Full textThis work is devoted to the study of spinel structure materials under radiation. For that purpose, samples of polycrystalline ZnAl2O4 and monocrystalline MgAl2O4 were irradiated by different heavy ions with different energies. Samples of ZnAl2O4 were studied par electron transmission microscopy, and by grazing incidence X-Ray diffraction and Rietveld analysis. Samples of MgAl2O4 were studied by optical spectroscopy. Most of the results concern amorphisation and crystalline structure modification of ZnAl2O4 especially the inversion. We were able to determine a stopping power threshold for amorphisation, between 11 keV/nm and 12 keV/nm, and also the amorphisation process, which is a multiple impacts process. We studied the evolution of the amorphous phase by TEM and showed a nanopatterning phenomenon. Concerning the inversion, we determined that it did happen by a single impact process, and the saturation value did not reach the random cation distribution value. Inversion and amorphisation have different, but close, stopping power threshold. However, amorphisation seems to be conditioned by a predamage of the material which consists in inversion
Hu, Rong. "Irradiation effects on Fe-Cr alloys." Thesis, University of Oxford, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.560928.
Full textLe, Gac Alexandre. "Comportement sous irradiation des verres d'aluminosilicate." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX047/document.
Full textThe understanding of radiation effects in oxide glasses is important in nuclear waste conditioning field and requires the evaluation of the role of the glass formers, mainly silicon, boron and aluminum, but also of the alkali and alkali-earth elements that can act either as modifier elements or charge compensators. Aluminoborosilicate glasses were highly studied and the role of boron coordination changes on structural evolution under irradiation was highlighted. However, there are only few studies on aluminosilicate glasses and almost no information about the influence of aluminum and its charge compensators on the glassy network evolution under irradiation. The goal of this work is therefore to determine the effects of aluminum content and type of charge compensators (here, Na and Ca cations) on the aluminosilicate glass structure evolution under irradiation. To understand the different phenomena in complex oxide glasses, 13 simplified glasses, composed of SiO2, Al2O3, Na2O and CaO oxides, were elaborated. Hence, the influence of Na2O/CaO and Al2O3/SiO2 ratios, and Al2O3 content, were investigated. To simulate alpha decays and compare electronic and ballistic damage, external irradiations at room temperature with 5 MeV He2+ and 7 MeV Au4+ were performed on glasses. 2.5 MeV electron irradiations were also done to obtain bulk samples irradiated by electronic collisions at low stopping power
Pellegrino, Stéphanie. "Irradiation aux ions des carbures ZrC et TiC. Effets des pertes d'énergie électronique et nucléaire." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS018/document.
Full textThis study is focused on the ceramic refractory transition metals, such as titanium carbide and zirconium envisaged to their strength characteristics under extreme conditions. These ceramics are subject to various sources of radiation (neutrons, fission products, the alpha decays) in future generation reactors IV. Radiation encountered in the reactor can be simulated by external irradiation with particle accelerators, using various ions in a wide energy range. These instruments can reproduce in controlled conditions damage suffered by nuclear materials.In such radiative context, two major processes govern damages into the materials: nuclear collisions induced by irradiation with low energy ions (like the recoil nuclei) and electronic excitations involved in irradiation with high-energy ions (such as fission products). The predominance of one of these processes is connected to the mass and energy of the accelerated particle. To understand the contribution of each effect in the damage mechanisms of crystal structures subjected to irradiation, we simulated radiation involving, on the one hand, low energy ions, i.e. a few MeV and, secondly, high energy ions, i.e. a few hundred MeV. The main objectives of this work were: (i) to study the behavior of these two carbides under irradiation, (ii) determine the structural, chemical and mechanical changes induced by nuclear and electronic effects, (iii) understand the damage mechanisms in these carbides in the nuclear regime and (iv) to try to explain the experimental results obtained by simulation calculations.For this, various characterization techniques were combined to explain the scenario of these carbides under irradiation as a reference, the silicon carbide SiC extensively studied in the past. These additional techniques are: Rutherford Backscattering Spectrometry in channeling mode (RBS-C), the X-ray diffraction (XRD), Raman spectroscopy, Transmission Electron Microscopy (TEM) and nanoindentation. The combination of these experimental techniques and simulation helped to consolidate our results and various assumptions. We were able to establish a scenario for these two types of carbides TiC and ZrC under ion irradiation
Dahl, Erik Monroe. "Single-Walled Carbon Nanotube Response to Neutron and Gamma Irradiation." Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/50856.
Full textSWNT samples were irradiated in the High Flux Isotope Reactor (HFIR) at Oak Ridge National Laboratory with neutrons and gamma rays at incremented lengths of time allowing for multiple fluence intensities to be received by the samples. After irradiation, Raman spectroscopy was used to monitor the damage incurred from neutron and gamma irradiation. It was found that disorder within the SWNT lattice network increased with increasing irradiation intensity. The results indicated that the gamma irradiation was causing the majority of the damage with little to no damage caused by the neutron irradiation. Further investigation showed that the non-linearity of the disorder increase with increasing irradiation intensity was typical of sample doping instead of the expected particle impacts. It was concluded that the gamma irradiation was generating dopants within the SWNTs by the process of water radiolysis. Water vapor trapped between the SWNT film layer and the substrate that the film layer was placed on was identified as the source of the sample dopants. Although unexpected, the results from this experiment have provided insight into a potential gamma radiation detection technique using SWNTs that has never been considered until now.
Master of Science
Just, Guillaume. "Caractérisation et modélisation des mémoires Flash embarquées destinées aux applications faible consommation et à forte contrainte de fiabilité." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4716/document.
Full textMany specific applications used in automotive, medical and spatial activity domains, require a very high level of reliability. These kinds of applications, working under severe constraints (high temperature, corrosion, vibration, radiations…) challenge memory manufacturers and impose them particular specifications in terms of reliability and energy consumption. In this context, work presented in this thesis aim at studying embedded Flash memories reliability for low power and high reliability applications. After an introduction oriented on areas of electrical characterizations and Test of non-volatile memories, a physical model of SILC leakage current is developed. This tool is used to answer to disturbs problematic and gives to designers and technologists a way to estimate the failure rate of memory cells according to physical, geometrical and electrical parameters, giving leads to minimize this unwanted phenomenon. Reliability (tunnel oxide, cell endurance) and performances (energy consumption) of Flash memory cell are then studied exploring process parameters variations and electrical conditions optimizations. Finally, an original real-time experiment over more than 15 months is focused on Flash memories retention reliability due to irradiative particles effects of natural terrestrial environment
Jutier, Frédéric. "Influence de l'auto-irradiation sur la supraconductivité de composés à base de plutonium." Paris 11, 2006. http://www.theses.fr/2006PA112115.
Full textAlthough plutonium (Pu) is most known for its nuclear properties, it is also a fascinating metal whose 5f electrons are at the threshold between itinerancy and localization. This unique behaviour in the periodic table makes Pu metal being at the crossover in electronic properties. The recent discovery of superconductivity in PuCoGa5 and PuRhGa5 is a new direct evidence of plutonium's electronic properties complexity. The high values of the critical temperature and the upper critical field seem to point to the existence of a third class of superconductor, transitional between uranium- and cerium-based heavy fermion systems, and the high-Tc copper oxides. If it were not for the toxicity hazards associated with plutonium compounds, and their high critical parameters together with a high critical current, would make these materials of promising potential for technological applications. The advantage of the PuCoGa5 and PuRhGa5 compounds is the alpha radioactivity of plutonium which constitutes a continuous in situ source of irradiation. The ageing of these compounds will have thus an impact on the critical parameters (Tc, Hc2, Jc). This work is based on the study by electrical resistivity and magnetisation of the evolution of the superconductivity parameters as a function of samples ageing, in order to determine the influence of “impurities” and defects on their superconducting behaviour and thus to bring eventual indications of an unconventional character
DOUIFI, LEILA. "Detection par resonance paramagnetique electronique et par thermoluminescence d'aliments ionises." Aix-Marseille 3, 1999. http://www.theses.fr/1999AIX30041.
Full textFlorentín, Matthieu. "Irradiation impact on optimized 4H-SiC MOSFETs." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/395187.
Full textLas tecnologías de dispositivos de potencia en silicio (Si) han alcanzado una gran madurez. Sin embargo, las limitaciones del Si debidas a sus restricciones mecánicas, térmicas y eléctricas hacen necesario otros materiales semiconductores que puedan competir con el Si y superar sus limitaciones. Este es el caso del Carburo de Silicio (SiC) y del Nitruro de Galio (GaN) que ya comienzan a ser serios competidores del Si debido a sus mejores propiedades físicas. En lo que respecta al SiC, el politipo 4H es el candidato más adecuado para la integración de MOSFETs de potencia debido, entre otros, a los valores del bandgap, campo eléctrico crítico, movilidad volumíca de los electrones y tensión umbral alcanzable. A pesar de estas ventajas teóricas del material, es necesario optimizar cada uno de los procesos tecnológicos involucrados en la fabricación de un MOSFET en SiC para que realmente pueda competir con su contrapartida en Si. Este es el caso del proceso de oxidación para la formación del dieléctrico de puerta. Concretamente, una buena estabilidad de la tensión umbral del componente requiere disminuir la densidad de cargas en la interfase óxido/semiconductor, y mejoras adicionales en la calidad de esta interfase son también necesarias para obtener altos valores de la movilidad de los portadores en el canal de inversión. La solución de los problemas tecnológicos anteriormente enunciados abrirá nuevas perspectivas a las aplicaciones de alta potencia. Este trabajo es una continuación directa del de Aurore Constant. Se centra en dispositivos basados en 4H-SiC, y más específicamente en los procesos de oxidación de puerta, y de sus comportamientos eléctricos en diferente ambientes de trabajo hostiles. Hasta la fecha, la mayor parte de la investigación se ha centrado en la mejora de la calidad de la interfase dióxido de silicio/carburo de silicio (SiO2/SiC). La solución de estos problemas debería permitir el diseño de MOSFETs muy rápidos y con pérdidas de conmutación muy bajas. El objetivo del trabajo previo de Aurore Constant fue encontrar un nuevo procedimiento de limpieza de la superficie antes de realizar la oxidación, y en definir un nuevo proceso de oxidación para la formación del dieléctrico de puerta. Los resultados obtenidos mostraron claras mejoras del comportamiento eléctrico de los componentes. Sin embargo, estamos convencidos que la mejora podría ser aún mayor optimizando la etapa del recocido post-oxidación, utilizando un proceso adicional de dopaje superficial, o realizando un adecuado proceso de irradiación. Todos los esfuerzos de este trabajo se han dirigido al desarrollo de MOSFETs en SiC fiables, con mejores características eléctricas, y capaces de trabajar en ambientes de alta temperatura y de irradiación protónica o electrónica. En resumen, las principales líneas de esta Tesis son las siguientes: 1. Estado del arte de los diferentes dominios de trabajo del SiC. 2. Procesos y técnicas de caracterización eléctrica. 3. Impacto de la irradiación de protones en MOSFETs fabricados en 4H-SiC, y descripción teórica de los mecanismos de creación de carga en la interfase SiO2/SiC. 4. Impacto de la irradiación electrónica en MOSFETs fabricados en 4H-SiC. 5. Optimización de los procesos de oxidación y de implantación. 6. Límite de robustez de los procesos tecnológicos optimizados en ámbitos irradiados.
Hayward, Erin M. G. "Atomistic studies on irradiation damage in iron." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34004.
Full textCanitez, Nazife. "Pasteurization of Apple Cider with UV Irradiation." Fogler Library, University of Maine, 2002. http://www.library.umaine.edu/theses/pdf/CanitezN2002.pdf.
Full textTabtiang, Arunee. "Irradiation crosslinking of oriented plasticised PVC compounds." Thesis, Loughborough University, 1995. https://dspace.lboro.ac.uk/2134/12433.
Full textFranzén, Lars. "Effects of fractionated irradiation on salivary glands." Doctoral thesis, Umeå universitet, Onkologi, 1992. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-101770.
Full textS. 1-43: sammanfattning, s. 47-164: 6 uppsatser
digitalisering@umu
El-Shaweesh, Kamal Husein. "Tissue culture and irradiation studies in Solanum." Thesis, University of Salford, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334320.
Full textAmjad, Muhammad. "Seed irradiation in relation to moisture content." Thesis, University of Salford, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.281596.
Full textMurphy, Susan Mary. "Theory of compositional effects in irradiation damage." Thesis, University of Oxford, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.670365.
Full textLondon, Andrew James. "Irradiation damage of oxide dispersion strengthened steels." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:4860651a-e919-449c-9e1c-8c6843adddd2.
Full textHang, Shuojin. "Irradiation-based defect engineering of graphene devices." Thesis, University of Southampton, 2015. https://eprints.soton.ac.uk/388184/.
Full textSMAALI, MOHAMMED. "Heterodiffusion et irradiation gamma du quartz alpha." Besançon, 1998. http://www.theses.fr/1998BESA2051.
Full textDing, Jing-Jie. "Irradiation of water ice and astrophysical implication." Caen, 2014. http://www.theses.fr/2014CAEN2056.
Full textIces can exist in our solar system for example on comets, the moons of Jupiter and Saturn, and trans-Neptunian objects. In the cold interstellar medium, they form thin layers on dust grains. Water (H2O) is the most abundant molecules in those ices, which are continuously exposed to the irradiation by cosmic rays, solar wind, and ions trapped in the magnetosphere of the giant planets. Simulation in the laboratory compared to telescopic observations can provide information to understand the large variety of radiation induced physicochemical processes. Therefore, we simulated the effects of swift heavy ion (cosmic ray analogs) and slow ion (solar wind, magnetosphere ions) irradiation of water ice at different beam lines of the GANIL accelerator facility. Fourier transform infrared spectroscopy (FTIR) was used to analyze the ices. The irradiation induced structural changes of water ice such as amorphization and compaction were studied. The efficiency to amorphize and compact the ice was established as a function of projectile stopping power with several swift heavy ions. Furthermore, by implantation of sulfur ions in water ice, the formation yield of sulfuric acid was measured and found to increase with projectile energy. From comparison to measure sulfur ion fluxes and sulfuric acid concentrations by the Galileo spacecraft, strong evidence was found that H2SO4 on Europa’s surface can be formed by sulfur ion implantation of magnetosphere ions in water ice. Finally, we also performed a first preliminary experiment to study the radiation induced chemistry with a carbonaceous solid substrate covered with a NH3+H2O ice mantle
Devary, Yoram. "Response of mammalian cells to ultraviolet irradiation /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1997. http://wwwlib.umi.com/cr/ucsd/fullcit?p9724890.
Full textAuvray, Marie-Hélène. "Endommagement sous irradiation de l'aluminate de lithium." Grenoble 2 : ANRT, 1987. http://catalogue.bnf.fr/ark:/12148/cb376024855.
Full textYu, Cunjing. "Modulation of immune responses by UV irradiation." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/22813.
Full textGee, Hannah. "Effects of space irradiation on astronaut bodies." Thesis, Boston University, 2013. https://hdl.handle.net/2144/21154.
Full textThe effects of space irradiation on the cardiovascular systems remain a great mystery. After conducting studies on survivors of the atomic bomb, radiotherapy as a treatment for cancer and other diseases, and health data of astronauts who have participated in short and long duration space missions, the overall conclusion is that ionizing irradiation of any type results in cardiovascular damage. Problems manifest decades after irradiation exposure and the accumulating health complications have led to fatalities. However, little is known about space irradiation and how it affects our bodies. Predictive models that were developed to date were created based on events that have occurred on earth. National Aeronautics and Space Administration (NASA) plans for manned missions to the Moon and Mars in the near future. There is a great need for ground-based studies about the effects of cosmic irradiation on the human body. We examined molecular pathways in the heart tissue of adult 7-9 months old mice, an equivalent of middle-age for astronauts (35-55), after receiving a single low dose full body of either 56Fe (iron) or 1H (proton) irradiation + aging of 1, 3, and 10 months. We also investigated mice after 56Fe or 1H irradiation + aging of 1, 3, and 10 months, and 3 days after an induced acute myocardial infarct (AMI). Western blot analyses were performed for proteins involved in cardiac function and cardiac recovery. Results indicated that 56Fe irradiation impaired cardiac function significantly during aging and continued to worsen with age. AMI results were less straightforward. The younger, 56Fe irradiated mice revealed a significant decrease in the expression of proteins associated with survival of cardiac tissue. The older, 1H irradiated mice group revealed a significantly decreased expression of proteins associated with survival of cardiac tissue. The 10 month 56Fe irradiated mice did not show compensatory mechanisms and the cardiac protein expression levels were attributed to aging. While the 10 month 1H irradiated mice compensated and required less repair activation.
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Pallikarakis, Christos. "Ion irradiation effects on Si nanocrystal properties." Thesis, KTH, Tillämpad fysik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-256346.
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