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Articles 1 - 30 of 85
Full-Text Articles in Physical Sciences and Mathematics
Dynamics Of The Dbi Spike Soliton, David Kastor, Jennie Traschen
Dynamics Of The Dbi Spike Soliton, David Kastor, Jennie Traschen
David Kastor
We compare oscillations of a fundamental string ending on a D3-brane in two different settings: (1) a test-string radially threading the horizon of an extremal black D3-brane and (2) the spike soliton of the DBI effective action for a D3-brane. Previous work has shown that overall transverse modes of the test-string appear as l=0 modes of the transverse scalar fields of the DBI system. We identify DBI world-volume degrees of freedom that have dynamics matching those of the test-string relative transverse modes. We show that there is a map, resembling T-duality, between relative and overall transverse modes for the test-string …
17th International Herman F. Mark Symposium: Polypropylene - A Material Of The Future, Otto Vogl, Helga Roder
17th International Herman F. Mark Symposium: Polypropylene - A Material Of The Future, Otto Vogl, Helga Roder
Emeritus Faculty Author Gallery
No abstract provided.
12. Pierre Sigwalt, Otto Vogl
12. Pierre Sigwalt, Otto Vogl
17th International Herman F. Mark Symposium: Polypropylene - A Material Of The Future, Otto Vogl, Helga Roder
17th International Herman F. Mark Symposium: Polypropylene - A Material Of The Future, Otto Vogl, Helga Roder
Otto Vogl
No abstract provided.
13. Josef Schurz, Otto Vogl
13. Josef Schurz, Otto Vogl
Climate Variability In The Andes Of Ecuador And Its Relation To Tropical Pacific And Atlantic Sea Surface Temperature Anomalies, Mathias Vuille, Raymond S. Bradley, Frank Keimig
Climate Variability In The Andes Of Ecuador And Its Relation To Tropical Pacific And Atlantic Sea Surface Temperature Anomalies, Mathias Vuille, Raymond S. Bradley, Frank Keimig
Raymond S Bradley
The main spatiotemporal modes of seasonal precipitation and temperature variability in the Andes of Ecuador (1N–4S) and their relation to tropical Pacific and Atlantic sea surface temperature anomalies (SSTAs) between 1963–92 are identified based on rotated principal component analysis and cross-correlation techniques. Outgoing longwave radiation composites are analyzed during periods of strong oceanic forcing to confirm the proposed physical mechanisms. Despite the close proximity to the Pacific, precipitation variability in the Andes of Ecuador is not related to SSTA in the tropical Pacific domain alone. The El Nin˜o–Southern Oscillation influence is most dominant in the northwestern part of the Andes …
14. Paolo Galli, Otto Vogl, Anna Maria Marcon-Galli
14. Paolo Galli, Otto Vogl, Anna Maria Marcon-Galli
Emeritus Faculty Author Gallery
No abstract provided.
14. Paolo Galli, Otto Vogl, Anna Maria Marcon-Galli
Tracing Interactions In Hickson Compact Groups Through The Hi, L Verdes-Montenegro, Min S. Yun, B A. Williams, W K. Huchtmeier, A Del Olmo, J Perea
Tracing Interactions In Hickson Compact Groups Through The Hi, L Verdes-Montenegro, Min S. Yun, B A. Williams, W K. Huchtmeier, A Del Olmo, J Perea
Min S. Yun
We present a global study of HI spectral line mapping for 16 Hickson Compact Groups (HCGs) combining new and unpublished VLA data, plus the analysis of the HI content of individual galaxies. Sixty percent of the groups show morphological and kinematical signs of perturbations (from multiple tidal features to concentration of the HI in a single enveloping cloud) and sixty five of the resolved galaxies are found to be HI deficient with respect to a sample of isolated galaxies. In total, 77% of the groups suffer interactions among all its members which provides strong evidence of their reality. We find …
15. Clement Henry Bamford, Otto Vogl, Daphne Stephen-Bamford
15. Clement Henry Bamford, Otto Vogl, Daphne Stephen-Bamford
Emeritus Faculty Author Gallery
No abstract provided.
15. Clement Henry Bamford, Otto Vogl, Daphne Stephen-Bamford
15. Clement Henry Bamford, Otto Vogl, Daphne Stephen-Bamford
Otto Vogl
No abstract provided.
The Impact Of Multicast Layering On Network Fairness, Jim Kurose
The Impact Of Multicast Layering On Network Fairness, Jim Kurose
Computer Science Department Faculty Publication Series
Many definitions of fairness for multicast networks assume that sessions are single-rate, requiring that each multicast session trans- mits data to all of its receivers at the same rate. These defini- tions do not account for multi-rate approaches, such as layering, that permit receiving rates within a session to be chosen indepen- dently. We identify four desirable fairness properties for multicast networks, derived from properties that hold within the max-min fair allocations of unicast networks. We extend the definition of multicast max-min fairness to networks that contain multi-rate sessions, and show that all four fairness properties hold in a multi- …
Luminosity Profiles Of Merger Remnants, J E. Hibbard, Min S. Yun
Luminosity Profiles Of Merger Remnants, J E. Hibbard, Min S. Yun
Min S. Yun
Using published luminosity and molecular gas profiles of the late-stage mergers NGC 3921, NGC 7252, and Arp 220, we examine the expected luminosity profiles of the evolved merger remnants, especially in light of the massive CO complexes that are observed in their nuclei. For NGC 3921 and NGC 7252, we predict that the resulting luminosity profiles will be characterized by an r1/4 law. In view of previous optical work on these systems, it seems likely that they will evolve into normal elliptical galaxies as regards their optical properties. Due to a much higher central molecular gas column density, Arp 220 …
Detection Of Co (2-1) And Radio Continuum Emission From The Z = 4.4 Qso Bri 1335–0417, C L. Carilli, Karl M. Menten, Min S. Yun
Detection Of Co (2-1) And Radio Continuum Emission From The Z = 4.4 Qso Bri 1335–0417, C L. Carilli, Karl M. Menten, Min S. Yun
Min S. Yun
We have detected redshifted CO (2-1) emission at 43 GHz and radio continuum emission at 1.47 and 4.86 GHz from the z = 4.4 QSO BRI 1335-0417 using the Very Large Array. The CO data imply optically thick emission from warm (>30 K) molecular gas with a total mass, M(H2), of (1.5 ± 0.3) × 1011 Msun, using the standard Galactic gas mass-to-CO luminosity conversion factor. We set an upper limit to the CO source size of 1farcs1 and a lower limit of 0farcs23(Tex/50 K)-1/2, where Tex is the gas excitation temperature. We derive an upper limit to the …
Perturbations Of Spherical Stellar Systems During Fly-By Encounters, E. Vesperini, Martin D. Weinberg
Perturbations Of Spherical Stellar Systems During Fly-By Encounters, E. Vesperini, Martin D. Weinberg
Astronomy Department Faculty Publication Series
We study the internal response of a galaxy to an unbound encounter and present a survey of orbital parameters covering typical encounters in different galactic environments. Overall, we conclude that relatively weak encounters by low-mass interloping galaxies can cause observable distortions in the primaries. The resulting asymmetries may persist long after the interloper is evident. We focus our attention on the production of structure in dark halos and in cluster ellipticals. Any distortion produced in a dark halo can distort the embedded stellar disk, possibly leading to the formation of lopsided and warped disks. We show that distant encounters with …
16. Eli M. Pearce, Otto Vogl, Judith Pearce
16. Eli M. Pearce, Otto Vogl, Judith Pearce
Emeritus Faculty Author Gallery
No abstract provided.
16. Eli M. Pearce, Otto Vogl, Judith Pearce
17. Hermann Klare, Otto Vogl, Burkart Philipp
17. Hermann Klare, Otto Vogl, Burkart Philipp
Emeritus Faculty Author Gallery
No abstract provided.
17. Hermann Klare, Otto Vogl, Burkart Philipp
The Relationship Of Cloud Cover To Near-Surface Temperature And Humidity: Comparison Of Gcm Simulations With Empirical Data, Pavel Ya. Groisman, Raymond S. Bradley, Bomin Sun
The Relationship Of Cloud Cover To Near-Surface Temperature And Humidity: Comparison Of Gcm Simulations With Empirical Data, Pavel Ya. Groisman, Raymond S. Bradley, Bomin Sun
Raymond S Bradley
One of the possible ways to check the adequacy of the physical description of meteorological elements in global climate models (GCMs) is to compare the statistical structure of these elements reproduced by models with empirical data from the world climate observational system. The success in GCM development warranted a further step in this assessment. The description of the meteorological element in the model can be considered adequate if, with a proper reproduction of the mean and variability of this element (as shown by the observational system), the model properly reproduces the internal relationships between this element and other climatic variables …
18. Dieter Freitag, Otto Vogl, Karina Rigby
18. Dieter Freitag, Otto Vogl, Karina Rigby
Emeritus Faculty Author Gallery
No abstract provided.
18. Dieter Freitag, Otto Vogl, Karina Rigby
19. Makoto Okawara, Otto Vogl, Teiji Tsuruta, Seiichi Nakahama
19. Makoto Okawara, Otto Vogl, Teiji Tsuruta, Seiichi Nakahama
Emeritus Faculty Author Gallery
No abstract provided.
19. Makoto Okawara, Otto Vogl, Teiji Tsuruta, Seiichi Nakahama
19. Makoto Okawara, Otto Vogl, Teiji Tsuruta, Seiichi Nakahama
Otto Vogl
No abstract provided.
Bounded Depth Arithmetic Circuits: Counting And Closure, Eric Allender
Bounded Depth Arithmetic Circuits: Counting And Closure, Eric Allender
Computer Science Department Faculty Publication Series
Constant-depth arithmetic circuits have been defined and studied in [AAD97,ABL98]; these circuits yield the function classes #AC0 and GapAC0. These function classes in turn provide new characterizations of the computational power of threshold circuits, and provide a link between the circuit classes AC0 (where many lower bounds are known) and TC0 (where essentially no lower bounds are known). In this paper, we resolve several questions regarding the closure properties of #AC0 and GapAC0 and characterize #AC0 in terms of counting paths in a family of bounded-width graphs.
20. Hiroshi Inagaki, Otto Vogl, Takeshi Fukuda, Masaki Tsuji
20. Hiroshi Inagaki, Otto Vogl, Takeshi Fukuda, Masaki Tsuji
Emeritus Faculty Author Gallery
No abstract provided.
20. Hiroshi Inagaki, Otto Vogl, Takeshi Fukuda, Masaki Tsuji
20. Hiroshi Inagaki, Otto Vogl, Takeshi Fukuda, Masaki Tsuji
Otto Vogl
No abstract provided.
Molecular Gas In The Z = 2.565 Submillimeter Galaxy Smm J14011+0252, D T. Frayer, R J. Ivison, N Z. Scoville, A S. Evans, Min S. Yun, Ian Smail, A J. Barger, A W. Blain, J P. Kneib
Molecular Gas In The Z = 2.565 Submillimeter Galaxy Smm J14011+0252, D T. Frayer, R J. Ivison, N Z. Scoville, A S. Evans, Min S. Yun, Ian Smail, A J. Barger, A W. Blain, J P. Kneib
Min S. Yun
We report the detection of CO (3 r 2) emission from the submillimeter-selected luminous galaxy SMM J1401110252. The optical counterpart of the submillimeter source has been identified as a merger system with spectral characteristics consistent with a starburst at z 5 2.565. The CO emission confirms the optical identification of the submillimeter source and implies a molecular gas mass of M,5#1010 h22 , after correcting 75 for a lensing amplification factor of 2.75. The large molecular gas mass and the radio emission are consistent with the starburst interpretation of the source. These results are similar to those found for SMM …