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dspace.mit.edu 檢索結果共 84617 筆,本頁資料從第 145 筆到第 156 筆

Objective: We examine and compare pedestrian-vehicle collisions and injury outcomes involving school-age children between 5 and 18 years of age in the capital cities of Santiago, Chile and Seoul, South Korea. Methods: We conduct descriptive analysis of the child pedestrian-vehicle collision (P-VC) data (904 collisions for Santiago, and 3,505 for Seoul) reported by the p....

By Carola Blazquez,Jae Seung Lee,P. Christopher Zegras--Taylor & Francis--2016-01-07
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High-resolution X-ray spectrometers onboard suborbital sounding rockets can search for dark matter candidates that produce X-ray lines, such as decaying keV-scale sterile neutrinos. Even with exposure times and effective areas far smaller than XMM-Newton and Chandra observations, high-resolution, wide field of view observations with sounding rockets have competitive sen....

By J. Rutherford,M. E. Eckart,R. L. Kelley,C. A. Kilbourne,D. McCammon,K. Morgan--IOP Publishing--2016-01-07
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We analyze simultaneously six composite RXTE spectra of GX 339–4 in the hard state comprising 77 million counts collected over 196 ks. The source spectra are ordered by luminosity and span the range 1.6%–17% of the Eddington luminosity. Crucially, using our new tool pcacorr, we re-calibrate the data to a precision of 0.1%, an order of magnitude improvement over all ....

By James F. Steiner,Jeffrey E. McClintock,Victoria Grinberg,Thomas Dauser,Javier A. Garcia,Rona Remillar--IOP Publishing--2016-01-07
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We show that interferometry can be applied to study irregular, rapidly rotating structures, as are expected in the turbulent accretion flow near a black hole. Specifically, we analyze the lagged covariance between interferometric baselines of similar lengths but slightly different orientations. For a flow viewed close to face-on, we demonstrate that the peak in the lagg....

By Michael D. Johnson,Abraham Loeb,Hotaka Shiokawa,Andrew A. Chael,Sheperd Samuel Doeleman--IOP Publishing--2016-01-07
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We present Atacama Large Millimeter/submillimeter Array (ALMA) 870 μm (345 GHz) data for 49 high-redshift (0.47 < z < 2.85), luminous (11.7 < log(L[subscript bol]/L[subscript ⊙] < 14.2) radio-powerful active galactic nuclei (AGNs), obtained to constrain cool dust emission from starbursts concurrent with highly obscured radiative-mode black hole (BH) accretion in mass....

By Carol J. Lonsdale,M. Lacy,A. E. Kimball,A. Blain,M. Whittle,B. Wilkes,D. Stern,J. C--IOP Publishing--2016-01-07
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Calibrating the photometric redshifts of ≳10[superscript 9] galaxies for upcoming weak lensing cosmology experiments is a major challenge for the astrophysics community. The path to obtaining the required spectroscopic redshifts for training and calibration is daunting, given the anticipated depths of the surveys and the difficulty in obtaining secure redshifts for so....

By Daniel Masters,Peter Capak,Daniel Stern,Olivier Ilbert,Mara Salvato,Samuel Schmidt,Giuseppe Longo,J R--IOP Publishing--2016-01-07
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We present the first sub-arcminute images of the Galactic Center above 10 keV, obtained with NuSTAR. NuSTAR resolves the hard X-ray source IGR J17456–2901 into non-thermal X-ray filaments, molecular clouds, point sources, and a previously unknown central component of hard X-ray emission (CHXE). NuSTAR detects four non-thermal X-ray filaments, extending the detection o....

By Frederick K. Baganoff--IOP Publishing--2016-01-07
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Using spectroscopically selected galaxies from the Sloan Digital Sky Survey we present a detection of reddening effects from the circumgalactic medium of galaxies which we attribute to an extended distribution of dust. We detect the mean change in the colors of "standard crayons" correlated with the presence of foreground galaxies at z ~ 0.05 as a function of angular se....

By J. E. G. Peek,Lia Corrales,Brice Menard--IOP Publishing--2016-01-07
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This paper examined possibilities for harmonizing the objectives of two metropolitan transportation infrastructure policy trends: sustainability and privatization. The paper linked these trends through the theory of fiscal federalism, hypothesizing that metropolitan highway public-private partnerships (PPPs) can reinforce sustainability if supported by a fiscal federali....

By Christopher Grillo,P. Christopher Zegras--Transportation Research Board of the National Academies--2016-01-07
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We present an elemental-abundance analysis, in the near-ultraviolet (NUV) spectral range, for the bright carbon-enhanced metal-poor (CEMP) stars HD 196944 (V = 8.40, [Fe/H] = −2.41) and HD 201626 (V = 8.16, [Fe/H] = −1.51), based on data acquired with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope. Both of these stars belong to the sub....

By Vinicius M. Placco,Timothy C. Beers,Inese I. Ivans,Dan Filler,Julie A. Imig,Ian U Roederer--IOP Publishing--2016-01-07
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We present the discovery of a transiting exoplanet candidate in the K2 Field-1 with an orbital period of 9.1457 hr: K2-22b. The highly variable transit depths, ranging from ~0% to 1.3%, are suggestive of a planet that is disintegrating via the emission of dusty effluents. We characterize the host star as an M-dwarf with T[subscript eff] [~ over -] 3800 K. We have obtain....

By Saul A. Rappaport,Fei Dai,Joshua Nathan Winn,L. Yu--IOP Publishing--2016-01-07
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The T Tauri star PTFO 8-8695 exhibits periodic fading events that have been interpreted as the transits of a giant planet on a precessing orbit. Here we present three tests of the planet hypothesis. First, we sought evidence for the secular changes in light-curve morphology that are predicted to be a consequence of orbital precession. We observed 28 fading events spread....

By Liang Yu,Michaël Gillon,Simon Albrecht,Allyson Bieryla,Fei Dai,Laetitia Delrez,Lynne Hillenbrand--IOP Publishing--2016-01-07
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