31,480 research outputs found
author-bios-SRD-19-0063.R1 – Supplemental material for The Network Structure of Police Misconduct
No full textSupplemental material, author-bios-SRD-19-0063.R1 for The Network Structure of Police Misconduct by George Wood, Daria Roithmayr and Andrew V. Papachristos in Socius</p
Astronomy Letters, V. 30, I. 05
No full textAstronomy Letters -- May 2004
Volume 30, Issue 5, pp. 283-356
A Photometric Study of Faint Galaxies in the Field of GRB 000926
T. A. Fatkhullin, A. A. Vasil'ev, and V. P. Reshetnikov
pp. 283-292 Full Text: PDF (393 kB)
The Light Curve of Supernova 1987A: The Structure of the Presupernova and Radioactive Nickel Mixing
V. P. Utrobin
pp. 293-308 Full Text: PDF (503 kB)
Dynamics of the Flows Accreting onto a Magnetized Neutron Star
A. M. Bykov and A. M. Krasil'shchikov
pp. 309-318 Full Text: PDF (260 kB)
Pulsating Microwave Emission from the Star AD Leo
V. V. Zaitsev, A. G. Kislyakov, A. V. Stepanov, B. Kliem, and E. Fürst
pp. 319-324 Full Text: PDF (219 kB)
HD 183143: A Hypergiant
E. L. Chentsov
pp. 325-331 Full Text: PDF (174 kB)
Line Variability in the Spectrum of Supergiant alpha Cam
A. Kh. Rzayev and V. E. Panchuk
pp. 332-342 Full Text: PDF (293 kB)
Reproducible Characteristics of the Solar Wind Acceleration
N. A. Lotova, K. V. Vladimirskii, V. N. Obridko, and I. A. Subaev
pp. 343-348 Full Text: PDF (178 kB)
Periodic Orbits in the General Three-Body Problem and the Relationship between Them
V. V. Orlov, A. V. Petrova, A. V. Rubinov, and A. I. Martynova
pp. 349-356 Full Text: PDF (419 kB)Archived web conten
Astronomy Letters, V. 31, I. 12
No full textAstronomy Letters -- December 2005
Volume 31, Issue 12, pp. 787-852
Analysis of the Clustering of 2dFGRS Galaxies Using the Method of a Modified Correlation Gamma Function
A. V. Tikhonov
pp. 787-791 Full Text: PDF (201 kB)
Optical Observations of Type-IIP Supernova 2004dj: Evidence for Asymmetry of the 56Ni Ejecta
N. N. Chugai, S. N. Fabrika, O. N. Sholukhova, V. P. Goranskij, P. K. Abolmasov, and V. V. Vlasyuk
pp. 792-805 Full Text: PDF (457 kB)
Supernova 1987A: The Envelope Mass and the Explosion Energy
V. P. Utrobin
pp. 806-815 Full Text: PDF (297 kB)
An Accretion Disk, a Bipolar Outflow, and an Envelope—a Structure That Accompanies the Formation of a Protostar
L. I. Matveyenko, V. A. Demichev, S. S. Sivakon', Ph. D. Diamond, and D. A. Graham
pp. 816-823 Full Text: PDF (285 kB)
Study of the Apsidal Motion in the Eclipsing Binary MZ Lac
V. S. Kozyreva, A. V. Kusakin, and M. Wolf
pp. 824-831 Full Text: PDF (210 kB)
Manifestation of the 399-Day Variations in Solar Wind Parameters
N. G. Skryabin, V. E. Timofeev, L. I. Miroshnichenko, and S. N. Samsonov
pp. 832-835 Full Text: PDF (150 kB)
Acceleration of Anomalous Cosmic Rays at the Heliospheric Termination Shock
E. G. Berezhko and L. T. Ksenofontov
pp. 836-843 Full Text: PDF (206 kB)
On the Stability of Particular Solutions of the Singly Averaged Hill Problem
M. A. Vashkov'yak and N. M. Teslenko
pp. 844-852 Full Text: PDF (320 kB)Archived web conten
Astronomy Letters, V. 31, I. 12
No full textdc.description[en_US]Astronomy Letters -- December 2005
Volume 31, Issue 12, pp. 787-852
Analysis of the Clustering of 2dFGRS Galaxies Using the Method of a Modified Correlation Gamma Function
A. V. Tikhonov
pp. 787-791 Full Text: PDF (201 kB)
Optical Observations of Type-IIP Supernova 2004dj: Evidence for Asymmetry of the 56Ni Ejecta
N. N. Chugai, S. N. Fabrika, O. N. Sholukhova, V. P. Goranskij, P. K. Abolmasov, and V. V. Vlasyuk
pp. 792-805 Full Text: PDF (457 kB)
Supernova 1987A: The Envelope Mass and the Explosion Energy
V. P. Utrobin
pp. 806-815 Full Text: PDF (297 kB)
An Accretion Disk, a Bipolar Outflow, and an Envelope���a Structure That Accompanies the Formation of a Protostar
L. I. Matveyenko, V. A. Demichev, S. S. Sivakon', Ph. D. Diamond, and D. A. Graham
pp. 816-823 Full Text: PDF (285 kB)
Study of the Apsidal Motion in the Eclipsing Binary MZ Lac
V. S. Kozyreva, A. V. Kusakin, and M. Wolf
pp. 824-831 Full Text: PDF (210 kB)
Manifestation of the 399-Day Variations in Solar Wind Parameters
N. G. Skryabin, V. E. Timofeev, L. I. Miroshnichenko, and S. N. Samsonov
pp. 832-835 Full Text: PDF (150 kB)
Acceleration of Anomalous Cosmic Rays at the Heliospheric Termination Shock
E. G. Berezhko and L. T. Ksenofontov
pp. 836-843 Full Text: PDF (206 kB)
On the Stability of Particular Solutions of the Singly Averaged Hill Problem
M. A. Vashkov'yak and N. M. Teslenko
pp. 844-852 Full Text: PDF (320 kB)dc.description.contributor[en_US]dc.description.contributor[en_US
Astronomy Letters, V. 28, I. 06
No full textAstronomy Letters -- June 2002
Volume 28, Issue 6, pp. 353-422
A Catalog of Cosmic Gamma-Ray Bursts Detected by the PHEBUS Instrument on the Granat Observatory: October 1994–December 1996
A. Yu. Tkachenko, O. V. Terekhov, R. A. Sunyaev, A. V. Kuznetsov, C. Barat, J.-P. Dezalay, and G. Vedrenne
pp. 353-365 Full Text: PDF (475 kB)
Correlation between Baryon Mass and Intergalactic Gas Temperature in Nearby Galaxy Clusters
A. A. Voevodkin, A. A. Vikhlinin, and M. N. Pavlinsky
pp. 366-372 Full Text: PDF (222 kB)
The Crab Nebula: Interpretation of Chandra Observations
S. V. Bogovalov and D. V. Khangoulyan
pp. 373-385 Full Text: PDF (287 kB)
Ionization Freeze-out and Hydrogen Excitation in the SN IIP Atmosphere
V. P. Utrobin and N. N. Chugai
pp. 386-392 Full Text: PDF (183 kB)
Spectroscopic Components in the Multiple Systems ADS 10683 and ADS 11791
M. G. Smekhov
pp. 393-396 Full Text: PDF (130 kB)
Observation of Quasi-Periodic Pulsations in the Solar Flare SF 900610
O. V. Terekhov, A. V. Shevchenko, A. G. Kuz'min, S. Yu. Sazonov, R. A. Sunyaev, and N. Lund
pp. 397-400 Full Text: PDF (173 kB)
Comprehensive Studies of Solar Activity on the CORONAS-F Satellite
V. N. Oraevsky and I. I. Sobelman
pp. 401-410 Full Text: PDF (243 kB)
Acoustic Power Mapping for Active Regions from MDI, HLH, and TON Data
O. V. Ladenkov, F. Hill, Sh. A. Egamberdiev, and D. Y. Chou
pp. 411-418 Full Text: PDF (458 kB)
On the Hill Stability in the General Problem of Three Finite Bodies
L. G. Luk'yanov and G. I. Shirmin
pp. 419-422 Full Text: PDF (133 kB)Archived web conten
Illuminaçao Apologetica do retrato de Morteçor en que aparecem com mais vivas côres os erros do author do novo Methodo, e seu Apologista ...
No full textFecha sacada de la pág.2 y 159Sign.: A-V\p4\sError tipográfico de signatura : a B\b2\s llama B\b3\
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
The light curve of supernova 1987A : the structure of the presupernova and radioactive nickel mixing
No full textAbstract—We have studied the influence of the presupernova structure and the degree of 56Ni mixing on the bolometric light curve of SN 1987A in terms of radiation hydrodynamics in the one-group approximation by abandoning LTE and by taking into account nonthermal ionization and the contribution of spectral lines to its opacity. Our study shows that moderate 56Ni mixing at velocities ≤2500 km s−1 can explain the observed light curve if the density of the outer layers of the presupernova exceeds the value obtained in the evolutionary model of a single nonrotating star severalfold. Abandoning LTE and allowing for nonthermal ionization when solving the equation of state and calculating the mean opacities and the thermal emission coefficient leads to a significant difference between the gas temperature and the radiation temperature in the optically thin layers of the supernova envelope. We demonstrate the fundamental role of the contribution of spectral lines to the opacity in an expanding envelope and of the accurate description of radiative transfer in reproducing the observed shape of the bolometric light curve. We have found that disregarding the contribution of spectral lines to the opacity introduces an error of∼20 % into the explosion energy, and that a similar error is possible when determining the mass of the ejected matter. The resonant scattering of radiation in numerous lines accelerates the outer layers to velocities of ≈36 000 km s−1; this additional acceleration affects the outer layers with a mass of ≈10−6M. Proper calculations of the supernova luminosity require that not only the delay effects, but also the limb-darkening effects be taken into account. Key words: supernovae and supernova remnants
An optimal hydrodynamic model for the normal type IIP supernova 1999em
No full textContext.There is still no consensus about progenitor masses of type IIP supernovae.
Aims.We study a normal type IIP SN 1999em in detail and compare it to a peculiar
type IIP SN 1987A.
Methods.We computed the hydrodynamic and time-dependent atmosphere models interpreting
simultaneously both the photometric and spectroscopic observations.
Results.The bolometric light curve of SN 1999em and the spectral evolution of its Hα line are consistent with a presupernova radius of 500 ± , an ejecta
mass of 19.0 ± , an explosion energy of 1051 erg, and a radioactive 56Ni mass of 0.036 ± .
A mutual mixing of hydrogen-rich and helium-rich matter in the inner layers of
the ejecta guarantees a good fit of the calculated light curve to that
observed. Based on the hydrodynamic models in the vicinity of the optimal model, we derive
the approximate relationships between the basic physical and observed
parameters. The hydrodynamic and atmosphere models of SN 1999em are inconsistent with the short
distance of 7.85 Mpc to the host galaxy.
Conclusions.We find that the hydrogen recombination in the atmosphere of a normal type IIP SN 1999em, as well as most likely other type IIP supernovae at the
photospheric epoch, is essentially a time-dependent phenomenon.
It is also shown that in normal type IIP supernovae the homologous expansion of
the ejecta in its atmosphere takes place starting from nearly the third day after
the supernova explosion.
A comparison of SN 1999em with SN 1987A reveals two very important results for
supernova theory.
First, the comparability of the helium core masses and the explosion energies
implies a unique explosion mechanism for these core collapse supernovae.
Second, the optimal model for SN 1999em is characterized by a weaker 56Ni
mixing up to ≈660 km s-1 compared to a moderate 56Ni
mixing up to ~3000 km s-1 in SN 1987A, hydrogen being mixed
deeply downward to ~650 km s-1
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