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 39 for “"x-ray radiation"”.
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Solid and hollow gold nanoparticles as radiosensitisers in combination with x-ray radiation and targeted radiopharmaceuticals
… only in combination with low kV radiation sources, but not with high kV or MV radiation. HGNs have been employed in photothermal ablation therapy, little work has been performed to investigate their potential as radiosensitisers, despite the superior physical properties, compared …
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High frequency quasi-periodic oscillations in the X-ray radiation of the black hole binary GRS 1915+105
… the Milky Way. It is one of the most variable X-ray sources known, and 12 variability classifications have been defined, many of which appear to be repetitive cycles of accretion instability. We study one particular variability type, the p cycle, which is selected for its high frequency …
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enhancement of charge particle emission from a plasma focus device
… for enhancing charged particle emission and x-ray radiation from the plasma focus device have been investigated. The design concept and the technical details are described. Design and fabrication of the required diagnostic instruments used to monitor the emitted charged particles and x-rays …
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An Investigation of Tungsten-Based Z-Pinch Planar Wire Array and Benchmarking Experiments
Wire array z-pinches provide an accessible means to research plasmas of high density and temperature and have valuable applications in the fields of inertial confinement fusion (ICF),astrophysics, and radiation studies. The purpose of this work is tungsten/aluminum z-pinch study and to aid in the …
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The evaluation of targeted radionuclide therapies and radio sensitising agents in malignant melanoma
… repair and IKKβ Inhibitors in combination with X-Ray radiation to determine suitability for future targeted radiotherapy/drug combination therapy approaches. Results: [131I]MIP1145 demonstrated accumulation and retention accompanied by considerable reductions in cell survival and tumour burden in …
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Studies on the gamma-ray burst phenomenon and on its use to probe the high redshift universe
Gamma-ray bursts (GRBs) are an enigmatic phenomenon whose physics and origins are still to be fully understood. Furthermore, thanks to their exceptional brightness they can be used as a tool to retrieve information on the high redshift universe. In my thesis work, I explore some of the research …
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Novel techniques in free electron lasers
… high power transversely coherent tunable radiation. X-ray radiation can be generated in the Self Amplified Spontaneous Emission regime, however this radiation has poor temporal coherence. The Echo-Enabled Harmonic Generation method can improve the radiation's temporal coherence in x-ray. …
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Microscopy of Gold Microcrystals by Coherent X -Ray Diffractive Imaging
"The small wavelength and penetrating nature of X-ray radiation has long been used to solve the structure of materials. Inherent in these measurements is the loss of phase information in the intensity measurement; the so-called ""phase problem."" Third generation synchrotrons provide X-ray beams …
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X-ray power density spectra of black hole binaries : a new deadtime model for the RXTE PCA
… tool for determining the frequency content of X-ray radiation from astronomical sources. For neutron star systems, power density spectra reveal coherent oscillations for those sources that are pulsars, while quasi-periodic oscillations over a wide range of frequencies (0.01 to 1300 Hz) are used …
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Charging of aggregate grains in astrophysical environments.
… also be charged by other means such as UV and X-ray radiation, and secondary electron emission due to the impact of energetic electrons and ions. The presence of charged dust particles alters the properties of the plasma. The charge on dust grains also affects their dynamics, and influences the …
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Spectroscopic analysis of selected silicon ceramics
… nitride and silicon oxynitride using soft x-ray spectroscopy, which analyses the electronic structure of materials by measuring the absorption and emission of x-ray radiation. Absorption and emission spectra of these materials are presented, many of which have not be previously documented. …
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Data-driven X-ray Tomographic Imaging and Applications to 4D Material Characterization
X-ray tomography is an imaging technique to inspect objects' internal structures with externally measured data by X-ray radiation non-destructively. However, there are concerns about X-ray radiation damage and tomographic acquisition speed in real-life applications. Strategies with insufficient …
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Micropatterned cell arrays for detecting DNA damage
… were chosen as a model cell type and x-ray radiation was chosen as a model DNA damaging agent. In order to establish the feasibility of measuring x-ray induced damage on hepatocyte DNA, standard curves were first generated for hepatocytes suspended in agarose. These experiments revealed …
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Probing the history of galaxy clusters with metallicity and entropy measurements
… range of 1 to 10 keV, and thus emits X-ray radiation. Studying the ICM through the spatial and spectral analysis of its emission returns the richest information about both the overall cosmological context which governs the formation of clusters, as well as the physical processes …
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Laser-Driven Particle Acceleration - Improving Performance Through Smart Target Design
… ~10 MeV regime. In addition, novel sources of x-ray radiation become available with these schemes. The topics covered in this thesis focus mainly on target normal sheath acceleration of protons in the overdense plasma regime and laser wakefield acceleration of electrons in the underdense regime. …
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Characterization of short-pulse laser-produced fast electrons by 3D hybrid particle-in-cell modeling of angularly resolved bremsstrahlung
… (WDM), advanced fusion concepts, and intense x-ray radiation for probing complex high areal density objects and inertial confinement fusion (ICF) fusion cores. However, determining laser-driven fast electron characteristics, specifically, electron energy distribution, divergence angle, and …
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Biomechanically Constrained Ultrasound to Computed Tomography Registration of the Lumbar Spine
… practice exposes patients and surgeons to X-ray radiation. The use of US for image guided navigation of the spine would greatly reduce the exposure of both the patient and the physician to ionizing radiation and allow the procedure to be performed outside of a specialized facility. However, …
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Effects of Radiation Exposure on Lung Carcinogenesis
… Analysis of several human populations exposed to radiation reveals that the lung is remarkably susceptible to the carcinogenic effects of radiation exposure. The considerable lung surface area and slow rate of epithelial turnover may have causal roles in this vulnerability. This may be due to the …
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A combined EMR and DFT study of radiation-induced defects in sucrose and glucose 1-phosphate
Ionizing radiation induces radicals in organic matter, i.e. molecules with one or more unpaired electrons. This dissertation deals with a detailed study of radicals induced by X-ray radiation in solid sucrose (also known as common household sugar) and in the dipotassium salt of glucose 1-phosphate …
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Retrieving Information from Scattered Photons in Medical Imaging
… it is worth exposing the patient to extra X-ray radiation dose in order to obtain an attenuation map. Finally, although the RTE can be used to model light propagation in tissues, it is computationally intensive and therefore time consuming. To increase the speed of computation in the DOT …
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