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 6298 for “"x-ray"”.
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Optical & X-ray Studies of Ultraluminous X-ray Sources
Ultraluminous X-ray Sources (ULXs) are point like X-ray sources situated external to the nucleus of their host galaxy, with inferred X-ray luminosities in excess of 10^{39} erg s^{−1} . Although first observed ∼ 30 years ago, these sources are yet to be fully understood. Some have suggested that …
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X-ray spectroscopy of low-mass X-ray binaries
I present high-resolution X-ray grating spectroscopy of neutron stars in low-mass X-ray binaries (LMXBs) using instruments onboard the Chandra X-ray Observatory and the X-ray Multi-Mirror Mission (XMM-Newton). The first part of this thesis concentrates on results from the subset of LMXBs with …
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X-ray spectroscopy of neutron star low-mass X-ray binaries
… of topics relating to neutron star lowmass X-ray binaries (LMXBs) and utilize spectral information from X-ray observations to further our understanding of these sources. First, I give an overview of important X- ray astrophysics relevant to the work I present in subsequent chapters, as well as …
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X-Ray Machine Tests and X-Ray Experiments for Undergraduate Physics Laboratories
… University Physics Department acquired an X-ray machine. There was a need to convert this device to an educational tool so it could be used on an undergraduate level. Procedure. First, the machine was tested to find its range limits. Secondly, numerous experiments were designed to use the …
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Designing a nanoscale x-ray source: towards single molecule x-ray scattering
… the design and construction of a femtosecond X-ray source based on high harmonic generation in an argon filled hollow capillary waveguide. The system has demonstrated excellent efficiency at generating harmonics in the range 20-50 eV and is tuneable by exploiting the ionization-induced …
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X-ray and optical properties of X-ray luminous active galactic nuclei
… et al. (1962) discovered a diffuse cosmic X-ray background with rocket experiments when they searched for lunar X-ray emission. Later satellite missions found a spectral peak in the cosmic X-ray background at ~30 keV. Imaging X-ray satellites such as ROSAT (1990-1999) were able to resolve up …
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Magnetic X-ray Reflectivity
… multilayer systems via magnetic soft and hard x-ray reflectivity. The focus here is on 3d transition metals, which are used mainly for development of numerous noval magnetic devices, that are both technologically and scientifically interesting. Complementary to Neutron diffraction, which is the …
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Coherent X -Ray Diffraction
… derived from the kinematical formulation for x-ray diffraction and from the temporal and spatial coherence of radiation. The antiphase domain structure of Cu 3Au is described, along with the associated reciprocal-space structure which is measured by CXD. CXD measurements place relatively …
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Coherent x-ray diffraction
Submitted by Meng Tao (mengtao2@illinois.edu) on 2012-10-26T22:51:05Z No. of bitstreams: 1 pitney_John.pdf: 12626202 bytes, checksum: 0a4edb5141b145027d659f789e1e8679 (MD5)
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Development of x-ray luminescence detection system and characterization of x-ray irradiated quantum dots for image-guided x-ray photodynamic therapy
The work in this thesis demonstrates X-ray luminescence (XL) detection system setup and XL quantification of X-ray irradiated quantum dots (QDs) to study efficiencies of X-ray photodynamic therapy (X-PDT). The XL detection system utilizes a light-sensitive electron-multiplying charge coupled device …
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A tri-modality x-ray fluorescence, x-ray luminescence, x-ray transmission computed tomography imaging platform for monitoring and stimulating metal-containing nanoparticles
X-ray-activated photodynamic therapy (X-PDT) techniques have gained traction for its potential to impart therapeutic effects at greater depths than possible with traditional photodynamic therapy [1], [2]. Interestingly, the underlying X-PDT process could also generate X-ray fluorescence (XF) with …
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Annular beam X-ray imaging
… by scanning objects through an annular beam of X‐rays. The resultant ring shaped projections record depth dependent parallax. The study focuses on two different scanning methods. First, a single axis scan has been employed to record curvilinear stereoscopic images. Second, a two axis raster …
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Nanofocusing Refractive X-Ray Lenses
… of the production of nanofocusing refractive x-ray lenses. These optics made of either silicon or diamond are well-suited for high resolution x-ray microscopy. The goal of this work is the design of a reproducible manufacturing process which allows the production of silicon lenses with high …
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X -Ray Diffraction Rotational Microrheology
… single particle tracking. The technique of X-ray diffraction rotational tracking has the ability to track the rotational motion of single crystals to a resolution of 80murad with a time resolution of 0.02 seconds. Rotational microrheology studies of single crystal Alumina tracer particles …
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Long wavelength X-ray microanalysis
… light element characteristic wavelengths in an x-ray scanning microanalyser. For long wavelength microanalysis purposes, the classica1 methods of x-ray spectrometr.v are impracticable. The proportional counter, the best of several possibilities, has there~ore been employed as a dispersive …
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Optical and X-ray studies of Be/X-ray binaries in the Small Magellanic Cloud
High-mass X-ray binaries (HMXBs) have proved to be some of the most interesting X-ray sources in the sky. The growing opulation of Small Magellanic Cloud (SMC) Be/X-ray binaries is monitored weekly with two 15ks RXTE observations. My thesis focuses on presenting the analysis of the X-ray data and …
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An X-ray spectroscopic study of the SMC X-1/Sk X-ray binary system
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Physics, 1999.
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