Young Age for the Veritas Asteroid Family Confirmed?     

Knežević  Z.  Pavlović  R. 《Earth, Moon, and Planets》2000,88(3):155-166

We present a comprehensive analysis of the dynamics of Veritas family members located in a chaotic strip centeredat 3.174 AU. A total of 600 chaotic members of the family and their clones were integrated for 100 Myr, and the variation of the distance with respect to the barycenter of the family have been computed forall of them. A simple classification of the prevailing behaviors hasbeen introduced to help identify typical dynamical patterns and states that could affect an estimate of the upper bound to the age of the family. We pointed out the importance of the temporary captures in thequasi-stable states, which occur often enough to affect the statistical analysis of the exits. The results are compatible with the young age (<100 Myr) for the family of Veritas, but we cannot say precisely how young it really is. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Column Density Distribution of Galactic Lyα AbsorptionSystems     

Milan M. Ćirković  Srdjan Samurović 《Astrophysics and Space Science》2000,271(1):91-95

A simple consistency argument for hypothesis of the galactic halo origin of the Lyα forest absorption lines is advanced, based on the recent determination of column-density vs. impact parameter relation for the low-redshift gaseous galactic haloes. It is shown that observations of neutral hydrogen absorption around luminous galaxies are consistent with the index of the power-law column density distribution derived from statistical analyses of large samples of high-redshift Lyα forest lines.PACS: 98.62.Ra, 98.62.Gq, 98.80.Es This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

Free-Free Absorption in Solar Atmosphere     

Dimitrijević  M. S.  Srećković  V. A.  Sakan  N. M.  Bezuglov  N. N.  Klyucharev  A. N. 《Geomagnetism and Aeronomy》2018,58(8):1067-1072

Geomagnetism and Aeronomy - The free-free i.e. electron-ion inverse “Bremsstrahlung” characteristics are determined for the case of the solar atmosphere as well as solar interior where...  相似文献   

Palaeo- and rock-magnetic investigations across Jurassic-Cretaceous boundary at St Bertrand’s Spring,Drôme,France: applications to magnetostratigraphy     

Tiiu Elbra  Petr Schnabl  Kristýna Čížková  Petr Pruner  Šimon Kdýr  Jacek Grabowski  Daniela Reháková  Andrea Svobodová  Camille Frau  William A.P. Wimbledon 《Studia Geophysica et Geodaetica》2018,62(2):323-338

Palaeo- and rock-magnetic investigations of the St Bertrand’s Spring (Le Ravin de Font de St Bertrand) locality in France were carried out in order to contribute to, and improve, the stratigraphy of the Jurassic-Cretaceous boundary interval. Magnetic susceptibility shows slightly diamagnetic behaviour in the lowermost part of the profile and an increase (paramagnetic) towards its middle and upper parts. Rock-magnetic measurements throughout the section show magnetite as the main magnetic fraction, together with traces of hematite. Additionally, thermal demagnetization indicates the presence of goethite. Our magnetostratigraphy indicates three normal/reversed polarity sequences; possibly encompassing the magnetozones M19r to the M17n. This suggests that the St Bertrand section straddles the Tithonian/Berriasian boundary and reaches the middle Berriasian sensu lato.  相似文献   

Numerical modelling of reinforced‐concrete structures under seismic loading based on the finite element method with discrete inter‐element cracks          下载免费PDF全文

Željana Nikolić  Nikolina Živaljić  Hrvoje Smoljanović  Ivan Balić 《地震工程与结构动力学》2017,46(1):159-178

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