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Browsing MIT Open Access Articles by Title

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  • Hover, Franz S.; Patrikalakis, Nicholas M.; Mullane, John; Keller, Samuel; Rao, Akshay; Adams, Martin; Yeo, Anthony (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 ...
  • Hu, Chih-Chi Andrew; Dougan, Stephanie K.; McGehee, Annette M.; Love, J. Christopher; Ploegh, Hidde (Nature Publishing Group, 2009-04)
    XBP-1, a transcription factor that drives the unfolded protein response (UPR), is activated in B cells when they differentiate to plasma cells. Here, we show that in the B cells, whose capacity to secrete IgM has been ...
  • Engreitz, Jesse Michael; Lander, Eric S.; Pandya-Jones, Amy; McDonel, Patrick; Shishkin, Alexander; Sirokman, Klara; Surka, Christine; Kadri, Sabah; Xing, Jeffrey; Goren, Alon; Plath, Kathrin; Guttman, Mitchell (American Association for the Advancement of Science (AAAS), 2013-07)
    Many large noncoding RNAs (lncRNAs) regulate chromatin, but the mechanisms by which they localize to genomic targets remain unexplored. We investigated the localization mechanisms of the Xist lncRNA during X-chromosome ...
  • Welstead, G. Grant; Creyghton, Menno P.; Bilodeau, Steve; Cheng, Albert W.; Markoulaki, Styliani; Young, Richard A.; Jaenisch, Rudolf (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 ...
  • Ignace, R.; Gayley, K. G.; Hamann, W.-R.; Huenemoerder, David P.; Oskinova, L. M.; Pollock, A. M. T.; McFall, M. (Institute of Physics/American Astronomical Society, 2013-09)
    We obtained four pointings of over 100 ks each of the well-studied Wolf-Rayet star WR 6 with the XMM-Newton satellite. With a first paper emphasizing the results of spectral analysis, this follow-up highlights the X-ray ...
  • Sutton, Patrick J.; Jones, Gareth; Chatterji, Shourov K.; Kalmus, Peter; Leonor, Isabel; Poprocki, Stephen; Rollins, Jameson; Searle, Antony; Stein, Leo Chaim; Tinto, Massimo; Was, Michal (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 ...
  • Goldman, Peter J.; Grove, Tyler L.; Booker, Squire J.; Drennan, Catherine L. (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 ...
  • Chou, F. C.; Liu, L.-K.; Chen, C. H.; Sheu, H. S.; Shu, G. J.; Chu, M.-W.; Huang, F.-T.; Lee, Patrick A. (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., ...
  • Paizis, A.; Rodriguez, J.; Chaty, S.; Santo, M. Del; Grinberg, V.; Wilms, J.; Ubertini, P.; Chini, R.; Nowak, Michael A. (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 ...
  • Pooley, David; Rappaport, Saul A.; Blackburne, Jeffrey A.; Schechter, Paul L.; Wambsganss, Joachim (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 ...
  • Lan, Shih-Hao; Kong, Albert K. H.; Verbunt, Frank; Lewin, Walter H. G.; Bassa, Cees; Anderson, Scott F.; Pooley, David (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 ...
  • Garcia, Michael R.; Hextall, Richard; Baganoff, Frederick K.; Galache, Jose; Melia, Fulvio; Murray, Stephen S.; Primini, F. A.; Sjouwerman, Loránt O.; Williams, Ben (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 ...
  • Bhalerao, Jayant; Park, Sangwook; Dewey, Daniel; Hughes, John P.; Mori, Koji; Lee, Jae-Joon (IOP Publishing, 2015-02)
    We report on the results from the analysis of our 114 ks Chandra High Energy Transmision Grating Spectrometer observation of the Galactic core-collapse supernova remnant G292.0+1.8. To probe the three-dimensional structure ...
  • Huenemoerder, David P.; Schulz, Norbert S.; Testa, Paola; Kesich, Anthony; Canizares, Claude R. (American Astronomical Society, 2009-11)
    θ(1) Ori E is a young, moderate mass binary system, a rarely observed case of spectral-type G-giants of about 3 solar masses, which are still collapsing toward the main sequence, where they presumably become X-ray faint. ...
  • Brodwin, M.; Stern, D.; Vikhlinin, A.; Stanford, S. A.; Gonzalez, A. H.; Eisenhardt, P. R.; Ashby, M. L. N.; Bautz, Marshall W.; Dey, A.; Forman, W. R.; Gettings, D.; Hickox, R. C.; Jannuzi, B. T.; Jones, C.; Mancone, C.; Miller, Eric D.; Moustakas, L. A.; Ruel, J.; Snyder, G.; Zeimann, G. (Institute of Physics/American Astronomical Society, 2011-05)
    We report the X-ray detection of two z > 1.4 infrared-selected galaxy clusters from the IRAC Shallow Cluster Survey (ISCS). We present new data from the Hubble Space Telescope and the W. M. Keck Observatory that spectroscopically ...
  • Huenemoerder, David P.; Schulz, Norbert S.; Testa, Paola; Drake, Jeremy J.; Osten, Rachel A.; Reale, Fabio (Institute of Physics/American Astronomical Society, 2010-11)
    We study the spectral and temporal behavior of X-ray flares from the active M dwarf EV Lac in 200 ks of exposure with the Chandra/HETGS. We derive flare parameters by fitting an empirical function which characterizes the ...
  • Neilsen, Joey; Markoff, S.; Nowak, Michael A.; Dexter, J.; Witzel, G.; Barrière, N.; Li, Y.; Baganoff, Frederick K.; Degenaar, N.; Fragile, P. C.; Gammie, C.; Goldwurm, A.; Grosso, N.; Haggard, D. (Institute of Physics/American Astronomical Society, 2015-01)
    We present a statistical analysis of the X-ray flux distribution of Sgr A* from the Chandra X-Ray Observatory's 3 Ms Sgr A* X-ray Visionary Project in 2012. Our analysis indicates that the observed X-ray flux distribution ...
  • Bitter, M.; Delgado-Aparicio, L.; Hill, K.; Pablant, N.; Reinke, Matthew Logan; Podpaly, Yuri; Hutchinson, Ian H.; Rice, John E.; Gao, Chi; Greenwald, Martin J.; Howard, Nathaniel Thomas; Hubbard, Amanda E.; Hughes, Jerry W.; White, Anne E.; Wolfe, Stephen M. (American Institute of Physics (AIP), 2012-11)
    This research describes advancements in the spectral analysis and error propagation techniques associated with x-ray imaging crystal spectroscopy (XICS) that have enabled this diagnostic to be used to accurately constrain ...
  • Schwartz, D. A.; Murphy, D. W.; Lovell, J. E. J.; Worrall, D. M.; Birkinshaw, M.; Perlman, E. S.; Godfrey, L.; Jauncey, D. L.; Marshall, Herman Lee; Gelbord, Jonathan (IOP Publishing, 2011-03)
    We present results from continued Chandra X-ray imaging and spectroscopy of a flux-limited sample of flat spectrum radio-emitting quasars with jet-like extended structure. X-rays are detected from 24 of the 39 jets observed ...
  • Yao, Y.; Tripp, T. M.; Wang, Q. D.; Danforth, C. W.; Canizares, Claude R.; Shull, J. M.; Marshall, Herman Lee; Song, L. (American Astronomical Society, 2009-05)
    The observed intergalactic O vi absorbers at z > 0 have been regarded as a significant reservoir of the “missing baryons.” However, to fully understand how these absorbers contribute to the baryon inventory, it is crucial ...
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