Browsing Doctoral Theses by Title
Now showing items 22229-22248 of 22282
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X-ray absorption by the intergalactic medium
(Massachusetts Institute of Technology, 2001)I have studied the intergalactic medium (IGM) located in galaxy clusters and groups via the so-called "X-ray Forest" the X-ray absorption lines produced by the hot IGM. I gave a semi-analytic calculation of the X-ray forest ... -
X-ray absorption spectroscopy of actinide speciation in solid solutions
(Massachusetts Institute of Technology, 2003)It is widely recognized that the behavior of actinides in the environment is dictated by their speciation, or chemical form. It is therefore imperative to have a clear understanding of a waste form or environmental contaminant ... -
X-ray and neutron scattering studies of the Rb₂MnF₄ and Cu₁â‚‹õxMgx̳GeO₃ in an external magnetic field
(Massachusetts Institute of Technology, 2001)This thesis presents results of two scattering studies of low dimensional magnetic materials. The first is a neutron scattering study of Rb2MnF4, a nearly ideal two-dimensional square lattice Heisenberg antiferromagnet ... -
X-ray astronomy with CCDs : calibration of the advanced CCD imaging spectrometer and observations of rotation-powered pulsars
(Massachusetts Institute of Technology, 2000)This dissertation concerns the use of charge coupled devices (CCDs) for X-ray astronomy. Part I of this thesis focuses on the calibration of the Advanced CCD Imaging Spectrometer (ACIS), one of the two primary focal plane ... -
X-ray CCDs for space applications : calibration, radiation hardness, and use for measuring the spectrum of the cosmic X-ray background
(Massachusetts Institute of Technology, 1995) -
X-ray diffraction analysis of the structure of deoxyribonucleic acid
(Massachusetts Institute of Technology, 1955) -
X-ray diffraction by elastically deformed crystals
(Massachusetts Institute of Technology, 1949) -
X-ray diffraction study of a three-component lamellar phase
(Massachusetts Institute of Technology, 1995) -
An x-ray diffraction study of the structure of glass.
(Massachusetts Institute of Technology, 1968) -
An X-ray investigation of some low-temperature solid phases of the systems Cu2S-Sb2S3, Cu2S-As2S3, Cu2S-FeS, and Cu2S-CuS
(Massachusetts Institute of Technology, 1953) -
X-ray lithographic alignment and overlay applied to double-gate MOSFET fabrication
(Massachusetts Institute of Technology, 2003)Double-gate MOSFETs represent a significant solution to transistor scaling problems and promise a dramatic improvement in both performance and power consumption. In this work, a planar lithographic process is presented ... -
X-ray Micro-Computed Tomography and Deep Learning Segmentation of Progressive Damage in Hierarchical Nanoengineered Carbon Fiber Composites
(Massachusetts Institute of Technology, 2021)Advanced composite laminates comprised of carbon (micro) fiber reinforced polymer (CFRP) have become widespread in modern high-performance aerospace structures, providing high, tailorable mass-specific stiffness and strength. ... -
X-ray phase contrast imaging of preclinical atherosclerosis
(Massachusetts Institute of Technology, 2016)Atherosclerosis is the leading causes of mortality and morbidity in the world. While there are a plethora of methods for treating clinical atherosclerosis, the primary cause of mortality is acute coronary syndrome (ACS) ... -
X-ray photoelectron spectroscopy of silicate glasses
(Massachusetts Institute of Technology, 1987) -
X-ray photon correlation spectroscopy studies of the dynamics of self-assembling block copolymer structures
(Massachusetts Institute of Technology, 2004)Several improvements presented to the emerging technique of X-ray Photon Correlation Spectroscopy. These improvements enabled the study of polymer structures, in particular isotropic sponge phases of homo-polymer block ... -
X-Ray scattering investigations of subtle ordering in correlated materials
(Massachusetts Institute of Technology, 2015)The interaction of many particles can lead to spectacular new phases of matter whose properties and collective excitations bear little resemblance to the individual particles and interactions. Understanding how the macroscopic ... -
X-ray scattering studies of self-organized nanoscale-structures on semiconductor surfaces
(Massachusetts Institute of Technology, 1998) -
X-ray scattering study of the critical behavior of binary liquid crystal mixtures
(Massachusetts Institute of Technology, 1981) -
X-ray searches for decaying sterile neutrinos with the Micro-X and XQC sounding rockets
(Massachusetts Institute of Technology, 2020)The nature of dark matter is a major question in modern physics. Cosmological measurements have motivated the existence of matter beyond the standard model, but thus far there has not been a definitive observation of any ... -
X-ray spectroscopic and timing studies of galactic black hole binaries
(Massachusetts Institute of Technology, 2002)In rare cases, optical observations of Galactic binary star systems which are bright in the X-ray portion of the electromagnetic spectrum dynamically constrain the mass of one component to be well above theoretical limits ...
