2,383 research outputs found
A star-forming galaxy at z= 5.78 in the Chandra Deep Field South
Full text linkWe report the discovery of a luminous z = 5.78 star-forming galaxy in the Chandra Deep Field South. This galaxy was selected as an ‘i-drop’ from the GOODS public survey imaging with the Hubble Space Telescope/Advanced Camera for Surveys (object 3 in the work of Stanway, Bunker & McMahon 2003). The large colour of (i′−z′)AB = 1.6 indicated a spectral break consistent with the Lyman α forest absorption shortward of Lyman α at z≈ 6. The galaxy is very compact (marginally resolved with ACS with a half-light radius of 0.08 arcsec, so rhl 5. Our spectroscopic redshift for this object confirms the validity of the i′-drop technique of Stanway et al. to select star-forming galaxies atz≈ 6
Chandra, Subrato - Professor of Aerospace Engineering
No full textDr. Subrato Chandra, Professor of Aerospace Engineering, holding an apparatus. He has focused his career on solar power, and is the author of A Guide to Solar Water Heating in Florida.https://stars.library.ucf.edu/univphotocollection/1588/thumbnail.jp
Negatively supercharging cellulases render them lignin-resistant
No full textNon-specific adsorption of cellulases to lignin hinders enzymatic deconstruction of lignocellulosic biomass. Here we tested the hypothesis that negatively supercharging cellulases could reduce lignin inhibition. Computational design was used to negatively supercharge the surfaces of Ruminoclostridium thermocellum family 5 CelE and a CelE-family 3a carbohydrate binding module fusion. Resulting designs maintained the same expression yield, thermal stability, and nearly identical activity on soluble substrate as the wild-type proteins. Four designs showed complete lack of inhibition by lignin but with lower cellulose conversion compared to original enzymes. Increasing salt concentrations could partially rescue the activity of supercharged enzymes, supporting a mechanism of electrostatic repulsion between designs and cellulose. Results showcase a protein engineering strategy to construct highly active cellulases that are resistant to lignin-mediated inactivation, although further work is needed to understand the relationship between negative protein surface potential and activity on insoluble polysaccharides.Peer reviewe
Radio sources in the Chandra Galactic Bulge Survey
Full text linkWe discuss radio sources in the Chandra Galactic Bulge Survey region. By cross-matching the X-ray sources in this field with the NRAO VLA Sky Survey archival data, we find 12 candidate matches. We present a classification scheme for radio/X-ray matches in surveys taken in or near the Galactic plane, taking into account other multiwavelength data. We show that none of the matches found here is likely to be due to coronal activity from normal stars because the radio to X-ray flux ratios are systematically too high. We show that one of the source could be a radio pulsar, and that one could be a planetary nebula, but that the bulk of the sources are likely to be background active galactic nuclei (AGN), with many confirmed through a variety of approaches. Several of the AGN are bright enough in the near-infrared (and presumably in the optical) to use as probes of the interstellar medium in the inner Galaxy
Compact objects in active galactic nuclei and X-ray binaries
No full textIn this thesis I study the inner-most regions of Active Galactic Nuclei (AGN) using
the reverberation mapping technique, and neutron star low-mass X-ray binaries in
quiescence using X-ray observations.
Using the 13-year optical monitoring data for the AGN NGC 5548, the luminosity dependence
of the Hβ emitting radius was modelled using a delay map, finding that
the radius scales with luminosity as predicted by recent theoretical models. Time-delays
between the continuum at different wavelengths in AGN can be used to probe the accretion
disc. Here, continuum time-delays in a sample of 14 AGN were used to measure the radial
temperature profile of the accretion discs, determine the nuclear extinction, and measure
distances to the objects. However, the distances measured correspond to a value for
Hubble's constant that is a factor of ~2 lower than the accepted value. The implications
of this on the thermal disc reprocessing model are discussed.
I present two Chandra observations of the neutron star transient in the globular
cluster NGC 6440 in quiescence, where the power-law component to the spectrum is seen
to be variable between the observations, suggesting that there is ongoing residual accretion.
From a Chandra observation of the globular cluster Terzan 1, I have identifed the likely
quiescent counterpart to a transient previously observed in outburst, and discuss the other
sources within the cluster. Using Chandra and XMM-Newton monitoring observations of
two neutron star transients (KS 1731-260 and MXB 1659-29) in quiescence I have found
that the neutron star crusts in both sources have now returned to thermal equilibrium
with the core. These observations also indicate that the crusts in both sources may have
a high thermal conductivity and that enhanced neutrino emission may be occurring in the
core. Finally, the discovery of an X-ray transient with XMM-Newton is presented, and the
other sources in this observation discussed
Religion, Culture and Nationalism in India. <br>: Interview with Sudhir Chandra (Mizoram University, India).
No full textFonds audiovisuel du programme "ESCoM-AAR" (Equipe Sémiotique Cognitive et nouveaux Médias - Archives Audiovisuelles de la Recherche. Paris, France, 2000 - 2016).Sudhir CHANDRA is an historian. His main research topic is the formation of national indian consciousness in the XXe century.He has published in 2002 Continuing Dilemmas: Understanding Social Consciousness (New Delhi, Tulika Books). He is also the author of Enslaved Daughters: Colonialism, Law and Women's Right (New Delhi, Oxford University Press, 1997), The Oppressive Present: Literature and Social Consciousness in Colonial India (New Delhi, Oxford University Press, 1992) and Dependence and Disillusionment: Emergence of National Consciousness in Later Nineteenth Century India (New Delhi, Manas, 1975)
Religion, Culture and Nationalism in India. <br>: Interview with Sudhir Chandra (Mizoram University, India).
No full textFonds audiovisuel du programme "ESCoM-AAR" (Equipe Sémiotique Cognitive et nouveaux Médias - Archives Audiovisuelles de la Recherche. Paris, France, 2000 - 2016).Sudhir CHANDRA is an historian. His main research topic is the formation of national indian consciousness in the XXe century.He has published in 2002 Continuing Dilemmas: Understanding Social Consciousness (New Delhi, Tulika Books). He is also the author of Enslaved Daughters: Colonialism, Law and Women's Right (New Delhi, Oxford University Press, 1997), The Oppressive Present: Literature and Social Consciousness in Colonial India (New Delhi, Oxford University Press, 1992) and Dependence and Disillusionment: Emergence of National Consciousness in Later Nineteenth Century India (New Delhi, Manas, 1975)
Inductive local-global conditions and generalised Harish-Chandra theory
No full textWe study new properties of generalised Harish-Chandra theory aiming at explaining the inductive local-global conditions for finite groups of Lie type in nondefining characteristic. In particular, we consider a parametrisation of generalised Harish-Chandra series that is compatible with Clifford theory and with the action of automorphisms on irreducible characters and we reduce it to the verification of certain requirements on stabilisers and extendibility of characters. This parametrisation is used by the author in a separate paper to obtain new conjectures for finite reductive groups that can be seen as geometric realisations of the local-global counting conjectures and their inductive conditions. As a by-product, we extend the parametrisation of generalised Harish-Chandra series given by Broué–Malle–Michel to the nonunipotent case by assuming maximal extendibility
Writing Chandra Levy: Real life, ritual, revision
No full textThis piece explores how national events affect art by chronicling one author\u27s writing process. Specifically, this piece looks at how September 11, 2001, affected the writing of a play about missing intern Chandra Levy. Though overshadowed by the nation-changing events, the scandal surrounding Levy\u27s disappearance was a top news story in the summer of 2001. This essay explores one author\u27s writing process as a play morphed in the face of national cataclysm. By tracing and describing revision, the piece explores how an academic exercise about the liminality of missing-ness turned into a religious ritual promoting compassion. © 2011 National Communication Association
Granthabali. Rai Bahadur Dina Bandhu Mittrer jivani o kabitta samalochana Bankim Chandra Chattopadhyaya Rai Bahadur Pranet.
No full textTranslation of title: Collected works. Life and criticism of the author by Bankim Chandra Chattopadhyaya.Title page and text in Bengali script.Mode of access: Internet
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