Browsing by Title
Now showing items 142220-142239 of 142658
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X Disease | Disease X: Medical Mystery-Solving and Epidemiological Change
(Massachusetts Institute of Technology, 2022-09)This thesis addresses epidemiological knowledge-making in the face of new, unknown, emerging diseases. It uses two cases, Australian X Disease of the early 1900s and Disease X of the dawning 2000s, to broadly interrogate ... -
The X Window System
(1986-10)An overview of the X Window System is presented, focusing on the system substrate and the low-level facilities provided to build applications and to manage the desktop. The system provides high-performance, high-level, ... -
X-band photonic band-gap accelerator structure breakdown experiment
(MIT Plasma Science and Fusion Center, 2010) -
X-band radar based SLAM in Singapore's off-shore environment
(Institute of Electrical and Electronics Engineers (IEEE), 2010)This paper presents a simultaneous localisation and mapping (SLAM) algorithm implemented on an autonomous sea kayak with a commercial off-the-shelf X-band marine radar mounted. The Autonomous Surface Craft (ASC) was driven ... -
X-Conference : reinventing a teleconferencing system
(Massachusetts Institute of Technology, 2001)In looking forward to more natural we can anticipate that the teleconferencing system of the future will enable participants at distant locations to share the same virtual space. The visual object of each participant can ... -
X-linked H3K27me3 demethylase Utx is required for embryonic development in a sex-specific manner
(National Academy of Sciences (U.S.), 2012-07)Embryogenesis requires the timely and coordinated activation of developmental regulators. It has been suggested that the recently discovered class of histone demethylases (UTX and JMJD3) that specifically target the ... -
X-Pipeline: an analysis package for autonomous gravitational-wave burst searches
(Institute of Physics Publishing, 2010-05)Autonomous gravitational-wave searches—fully automated analyses of data that run without human intervention or assistance—are desirable for a number of reasons. They are necessary for the rapid identification of ... -
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 elucidates the impact of structural disorder on electron mobility in amorphous zinc-tin-oxide thin films
(American Institute of Physics (AIP), 2014-06)We investigate the correlation between the atomic structures of amorphous zinc-tin-oxide (a-ZTO) thin films grown by atomic layer deposition (ALD) and their electronic transport properties. We perform synchrotron-based ... -
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 analysis of butirosin biosynthetic enzyme BtrN redefines structural motifs for AdoMet radical chemistry
(National Academy of Sciences (U.S.), 2013-10)The 2-deoxy-scyllo-inosamine (DOIA) dehydrogenases are key enzymes in the biosynthesis of 2-deoxystreptamine–containing aminoglycoside antibiotics. In contrast to most DOIA dehydrogenases, which are NAD-dependent, the DOIA ... -
X-ray and electron diffraction studies of superlattices and long-range three-dimensional Na ordering in gamma-Na[subscript x]CoO[subscript 2] (x=0.71 and 0.84)
(American Physical Society, 2009-01)We have recently demonstrated that x=0.71 and 0.84 are the two most stable single-phase compounds above x=0.5 in gamma-Na[subscript x]CoO[subscript 2] [G. J. Shu et al., Phys. Rev. B 76, 184115 (2007); F. C. Chou et al., ... -
X-RAY AND NEAR-INFRARED OBSERVATIONS OF THE OBSCURED ACCRETING PULSAR IGR J18179–1621
(IOP Publishing, 2012-09)IGR J18179–1621 is an obscured accreting X-ray pulsar discovered by INTEGRAL on 2012 February 29. We report on our 20 ks Chandra-High Energy Transmission Gratings Spectrometer observation of the source performed on 2012 ... -
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 and optical flux ratio anomalies in quadruply lensed quasars. II. Mapping the dark matter content in elliptical galaxies
(Institute of Physics Publishing, 2012-01)We present a microlensing analysis of 61 Chandra observations of 14 quadruply lensed quasars. X-ray flux measurements of the individual quasar images give a clean determination of the microlensing effects in the lensing ... -
X-RAY AND OPTICAL STUDY OF LOW CORE DENSITY GLOBULAR CLUSTERS NGC6144 AND E3
(IOP Publishing, 2010-03)We report on the Chandra X-ray Observatory and Hubble Space Telescope (HST) observations of two low core-density globular clusters, NGC6144 and E3. By comparing the number of X-ray sources inside the half-mass radius to ... -
X-RAY AND RADIO VARIABILITY OF M31*, THE ANDROMEDA GALAXY NUCLEAR SUPERMASSIVE BLACK HOLE
(Institute of Physics/American Astronomical Society, 2010-02)We confirm our earlier tentative detection of M31* in X-rays and measure its light curve and spectrum. Observations in 2004-2005 find M31* rather quiescent in the X-ray and radio. However, X-ray observations in 2006-2007 ... -
X-ray and VUV observations of Mo23+ - MO33+ brightness profiles from Alcator C-Mod plasmas
(MIT Plasma Science and Fusion Center, 1995-01-01) -
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 ... -
The X-Ray Bursts of XTE J1739–285: A NICER Sample
(American Astronomical Society, 2021)© 2021. The American Astronomical Society. All rights reserved.. In this work, we report on observations with the Neutron Star Interior Composition Explorer of the known neutron star X-ray transient XTE J1739-285. We ...
