Copepods in Hypersaline Waters Worldwide:Diversity,Environmental,Social,and Economic Roles     

Elena ANUFRIIEVA 《《地质学报》英文版》2014,88(Z1):43-45

正1 Introduction Copepods are a group of small crustaceans,which play an important ecological role in aquatic ecosystems.They occupy different ecological niches in aquatic food webs,contributes to biogenic element cycles,and transfer of organic matter from primary producers to higher secondary consumers.Copepods also have the potential to  相似文献   

An Integrated Study to Analyze Salt Lake Microbial Community Structure(Novosibirsk Oblast,Russia)     

Alla BRYANSKAYA  Alexey ROZANOV  Tatyana MALUP  Taisiya ALESHINA  Elena LAZAREVA  Oxana TARAN  Tatyana GORYACHKOVSKAYA  Vladimir IVANISENKO  Sergey PELTEK 《《地质学报》英文版》2014,88(Z1):61-62

正Salt Lake is one of the lakes in the system,consisting of a huge amount of salt and bitter-salty lakes in Novosibirsk Oblast and Altai Krai.These lakes are unique and highly unstable systems where the parameters of geochemical  相似文献   

Long-term Changes in the Saline Lake Qarun(Egypt)     

Gamal EL-SHABRAWY  Mohamed GOHAR  Mousa GERMOUSH  Elena ANUFRIIEVA  Nickolai SHADRIN 《《地质学报》英文版》2014,88(Z1):180-182

正1 Introduction There is now ample evidence of the impacts of the recent climate change and anthropogenic activities on different saline lake ecosystems.All over the world salt lakes are threatened by climate change,water diversions upstream for agricultural purposes,watershed changes,introduction of aliens,etc.that result in catastrophic  相似文献   

Modelling the interseismic deformation of a thrust system: seismogenic potential of the Southern Alps     

Salvatore Barba  Debora Finocchio  Elena Sikdar  Pierfrancesco Burrato 《地学学报》2013,25(3):221-227

This article focuses on the Montello thrust system in the Eastern Southern Alps as a potential seismogenic source. This system is of particular interest because of its lack of historical seismicity. Nevertheless, the system is undergoing active deformation. We developed a finite‐element model using visco‐elasto‐plastic rheology. The free parameters of the model (essentially, the locking status of the three thrusts included in the study), were constrained by matching the observed horizontal GPS and vertical levelling data. We show that the amount of interseismic fault locking, and thus the seismic potential, is not necessarily associated with the fastest‐slipping faults. More specifically, the locked Bassano thrust has a greater seismic potential than the freely slipping Montello thrust. The findings suggest that faults with subtle evidence of Quaternary activity should be carefully considered when creating seismic hazard maps.  相似文献   

Quenched millimetre emission from Cygnus X-1 in a soft X-ray state     

S. P. Tigelaar  R. P. Fender  R. P. J. Tilanus  E. Gallo  G. G. Pooley 《Monthly notices of the Royal Astronomical Society》2004,352(3):1015-1018

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XMM–Newton observations of bright ROSAT selected active galactic nuclei with low intrinsic absorption     

L. C. Gallo  I. Lehmann  W. Pietsch  Th. Boller  W. Brinkmann  P. Friedrich  D. Grupe 《Monthly notices of the Royal Astronomical Society》2006,365(2):688-698

We present a sample of 21 ROSAT bright active galactic nuclei (AGNs), representing a range of spectral classes, and selected for follow-up snapshot observations with XMM–Newton . The typical exposure was between 5 and 10 ks. The objects were primarily selected on the bases of X-ray brightness and not on hardness ratio; thus the sample cannot be strictly defined as a 'soft'sample. One of the main outcomes from the XMM–Newton observations was that all of the AGN, including 11 type 1.8–2 objects, required low levels of intrinsic absorption  ( N _H≲ 10²¹ cm⁻²)  . The low absorption in type 2 systems is a challenge to account for in the standard orientation-based unification model, and we discuss possible physical and geometrical models which could elucidate the problem. Moreover, there does not appear to be any relation between the strength and shape of the soft excess, and the spectral classification of the AGN in this sample. We further identify a number of AGN which deserve deeper observations or further analysis: for example, the low-ionization nuclear emission regions (LINERs) NGC 5005 and NGC 7331, where optically thin thermal and extended emission is detected, and the narrow-line Seyfert 1 II Zw 177, which shows a broad emission feature at ∼ 5.8 keV.  相似文献   

Local And Global Diffusion Along Resonant Lines in Discrete Quasi-integrable Dynamical Systems     

Claude Froeschlé  Massimiliano Guzzo  Elena Lega 《Celestial Mechanics and Dynamical Astronomy》2005,92(1-3):243-255

We detect and measure diffusion along resonances in a quasi-integrable symplectic map for different values of the perturbation parameter. As in a previously studied Hamiltonian case (Lega et al., 2003) results agree with the prediction of the Nekhoroshev theorem. Moreover, for values of the perturbation parameter slightly below the critical value of the transition between Nekhoroshev and Chirikov regime we have also found a diffusion of some orbits along macroscopic portions of the phase space. Such a diffusion follows in a spectacular way the peculiar structure of resonant lines.  相似文献   

A comprehensive study of reported high-metallicity giant H ii regions – II. Ionizing stellar populations     

Marcelo Castellanos  Angeles I. Díaz  Elena Terlevich † 《Monthly notices of the Royal Astronomical Society》2002,337(2):540-552

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Narrow-band CCD photometry of giant H ii regions     

Guillermo Bosch †  Elena Terlevich ‡  Roberto Terlevich § 《Monthly notices of the Royal Astronomical Society》2002,329(3):481-496

We have obtained accurate CCD narrow-band Hβ and Hα photometry of giant H  ii regions (GEHRs) in M33, NGC 6822 and M101. Comparison with previous determinations of emission-line fluxes shows large discrepancies; their probable origins are discussed. Combining our new photometric data with global velocity dispersion ( σ ) derived from emission linewidths, we review the     relation. A re-analysis of the properties of the GEHRs included in our sample shows that age spread and the superposition of components in multiple regions introduce a considerable spread in the regression. Combining the information available in the literature regarding ages of the associated clusters, evolutionary footprints on the interstellar medium, and kinematical properties of the knots that build up the multiple GEHRs, we find that a subsample – which we refer to as young and single GEHRs – do follow a tight relation in the     plane.  相似文献   

Mrk 1014: an AGN-dominated ultraluminous infrared galaxy     

Th. Boller  L. C. Gallo  D. Lutz  E. Sturm 《Monthly notices of the Royal Astronomical Society》2002,336(4):1143-1146

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