Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 36 for “"radiation resistance"”.
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Studying Mechanisms of Ionizing Radiation Resistance in Bacteria: Evidence for Multiple Pathways
Our lab created ionizing radiation (IR) resistant populations of E. coli MG1655 through twenty cycles of exposure to IR and outgrowth. To identify the genetic alterations responsible for increased IR tolerance, a total of seven isolates from the evolved final population were re-sequenced. However, …
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Ionizing Radiation Resistance of Random Hole Optical Fiber for Nuclear Instrumentation and Control Applications
… of this research work was to investigate the radiation resistance of Random Hole Optical Fibers (RHOF) for possible use as both sensing element and data transmission medium in nuclear reactor instrumentation and control applications. This work is motivated by the demand for efficient, cost …
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Understanding Radiation Resistance in Head and Neck Tumor Xenografts Using Diffuse Reflectance and Raman Spectroscopy
… treated with a combination of daily fractions of radiation and weekly chemotherapy sessions for up to seven weeks. Current methods to evaluate treatment response of individual patients are limited to anatomical measurements of tumor burden using CT scan or MRI 4-8 weeks after completion of …
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Improving radiation resistance of solid solutions by addition of defect trapping solutes: Atomistic simulations and continuum modeling
Many radiation damage phenomena are driven by the production and fluxes of point defects, particularly in alloys. The addition of defect-trapping solute has been proposed to improve radiation damage tolerance. Selecting effective solute is complicated however, because the trapping is a complex …
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Improving radiation resistance of metal alloys through the addition of multiple synergistic solutes: Atomistic simulations and experimental analysis
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-08-01
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The ecology and evolutionary history of the Deinococcaceae family
… capability to withstand extreme doses of gamma radiation and prolonged desiccation. D. radiodurans is also type species and the first described member of the Deinococcus genus. It demonstrates approximately 3000 times more radiation resistance capability than humans and 50 times more than …
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INTEGRATION OF REDOX-REGULATED SIGNALING AND METABOLISM IN HEAD AND NECK CANCER
… characterized by genetic and metabolic changes. Radiation therapy alone or combined with systemic chemotherapy is widely used for treatment of HNSCC as definitive treatment or as adjuvant treatment after surgery. Resistance to radiation therapy significantly impacts the ability to achieve local …
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Radiofrequency losses in an NMR surface coil
… were measured and used to determine the coil radiation resistance, load resistance, B, field magnitude, and SNR. Radiation resistance is shown to increase like RR ~ f04. It is widely believed that load losses dominate all other losses in biomedical NMR. This study indicates that limiting …
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Research and Development of Low-Profile, Small Footprint Antennas for VHF-UHF Range Applications
… between an antenna's physical length and radiation efficiency has also been established. Therefore, a combination of these constraints complicates the design of low-frequency antennas that have small physical size but with enough radiation resistance to be an efficient radiator when …
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Irradiation effects on geopolymer and additively manufactured 316H stainless steel and porosity in equine hoof wall
… manufactured (AM) 316H stainless steel (SS) for radiation resistance, and equine hoof walls serving as bioinspiration for impact-resistant materials designs. First, I explored a potassium-based geopolymer implanted with Ti+ ions to simulate neutron irradiation as a concrete alternative for …
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Irradiation effects on mechanical and physical properties of SS304L-nanotube composites
… behavior of structural materials due to radiation damage is a key limiting factor to service lifetime. The development of advanced materials can potentially improve material performance under irradiation and increase their design lifetime. Traditional alloy design always sacrifices one …
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Acoustically induced vibration of, and sound radiation from, slender beams
… of the beam. The relationship between sound radiation and acoustically induced vibration is then demonstrated by using a theory based upon the principle of reciprocity to predict the resonant response of a cylindrical beam to acoustic excitation. The results show that radiation and response …
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Ultrasonic transducers for wideband attenuation measurements
… impedance matching were implemented. Certain radiation characteristics of thickness-mode transducers such as beam directivity and radiation resistance were investigated as functions of the "diameter to wavelength" ratio, D/)... , of the radiating transducer. Maximum radiation resistance (and …
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THE EFFECT OF SILENCING THE WILMS' TUMOR 1 GENE ON THE RADIATION SENSITIVITY OF GLIOBLASTOMA CELLS
… due its remarkable proliferative capacity and resistance to current treatments. High levels of the Wilms' Tumor 1 (WTI) gene have been identified in glioblastomas, suggesting an oncogenic function. Moreover, known WT1 target genes have been implicated in resistance to radiation. To determine …
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Emission of whistler waves from an ionospheric tether
… flux on the sphere around the antenna, the radiation resistance of this antenna is computed. We compare the results with some past analytical and experimental works. We also analyze the wave propagation characteristics. The wave propagation ways are different for different wave frequencies. …
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Characterization of Amorphous Carbon Films for Mask Protection during Ion Beam Bombardment
… of mask charging, and improved with respect to radiation resistance. Further stress measurements are taken, with particular emphasis on in-situ, in vacuum measurements of film response to ion bombardment.
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The properties of oxide-dispersed and spinodally strengthened copper alloys following high-temperature neutron environment exposure
… were found to be dominated by the details of the radiation-induced void distribution. The chemical composition and quantity of the dispersed oxide were found to have a substantial influence on the radiation resistance of oxide dispersed copper alloys. Of the oxide dispersed alloys studied, alloys …
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Identification of Molecular Targets for the Treatment of the Skeletal Phenotype in Lysosomal Storage Disorders
… autophagy through the phosphorylation of the UV radiation resistance-associated gene (UVRAG) protein, a member of the Beclin1/Vps34 complex. Reducing mTORC1 signaling or enhancing Beclin1/Vps34/UVRAG complex activity rescued autophagy flux in LSD chondrocytes. <i>In vivo</i>, normalization of …
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Computer simulation of defect evolution in lanthanum doped cerium dioxide under irradiation
… to clarify the similarities and differences in radiation resistance properties between ceria and urania, computer modeling methods are applied to explore the defect evolution in cerium dioxide under irradiation condition. In this study, conventional atomic potential for the cerium dioxide system …
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DISORDERING IN PYROCHLORE PHASES FOR RADIONUCLIDES DISPOSAL: A MULTISCALE STRUCTURE STUDY
… in particular, has demonstrated high radiation resistance, making it an ideal host-matrix for encapsulating radioactive elements within the crystal structure. Despite the average structure, chemical composition can induce intrinsic structural distortions and control the degree of …
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