Inter-annual and seasonal variations of energy and water vapour fluxes above a Pinus sylvestris forest in the Siberian middle taiga   总被引：2，自引：0，他引：2  

Nadejda M. Tchebakova  Olaf Kolle  Daniil Zolotoukhine  Almut Arneth  Julie M. Styles  Natalia N. Vygodskaya  E.-Detlef Schulze  Olga Shibistova  Jon Lloyd 《Tellus. Series B, Chemical and physical meteorology》2002,54(5):537-551

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Detailed surface photometry of NGC 2685, a galaxy with polar ring     

V. V. Makarov  V. P. Reshetnikov  V. A. Yakovleva 《Astrophysics》1989,30(1):6-14

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Coastal cooling/heating events: Laboratory experiments     

Natalia Demchenko  Irina Chubarenko 《Acta Geophysica》2007,55(1):56-64

We report the results of laboratory experiments on water heating/cooling, performed in 5 m long water channel with a slope. About 63 series of photos were analyzed: for 3 locations, for 3 bottom slopes (3.7, 6.7 and 12 degrees) and for different Ra numbers. It was pointed out that there exist two types of mixing characterizing different circulations in the presence of slope: gravity current and undersurface jet; the thermal bar is the region where one type of mixing is replaced by another; the highest speed and flowrate are at the break point; the flow is three-dimensional.  相似文献   

Testing the applicability of a Marine Biotic Index (AMBI) to assessing the ecological quality of soft-bottom benthic communities, in the South America Atlantic region   总被引：2，自引：0，他引：2  

Muniz P  Venturini N  Pires-Vanin AM  Tommasi LR  Borja A 《Marine pollution bulletin》2005,50(6):624-637

Recently, several monitoring programmes have been undertaken to evaluate the impact of different anthropogenic activities, upon a range of coastal ecosystems located in the South-western Atlantic. In the present contribution, the applicability of the AZTI's Marine Biotic Index (AMBI) is tested, to establish the benthic health of the ecosystem using these data sets. As the AMBI was created previously for use in European estuarine and coastal environments, its general applicability to new geographical locations is discussed. In general, the results are in agreement with those obtained using traditional univariate and multivariate methods. Some inconsistent results are observed, when low abundances and/or number of taxa are recorded in the samples. Moreover, when the macrofauna samples are dominated by large nematodes, the classification of the benthic ecosystem health using AMBI is not consistent with previous results achieved applying other statistical techniques. Thus, parallel to the application of this index to a wider extend, the complementary use of different indices and/or methods is recommended to assess confidently the environmental quality of a coastal area.  相似文献   

The Toksko-Algomin igneous complex of the Dzhugdzhur-Stanovoi folded region: Age and geodynamic setting     

E. B. Sal’nikova  A. M. Larin  A. B. Kotov  A. P. Sorokin  A. A. Sorokin  S. D. Velikoslavinsky  S. Z. Yakovleva  A. M. Fedoseenko  Yu. V. Plotkina 《Doklady Earth Sciences》2006,409(2):888-892

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Early Proterozoic age of the Tyrkandin fault zone, the Aldan Shield: U-Pb dating of fragments of single zircon grains     

E. B. Sal’nikova  A. B. Kotov  V. I. Kazansky  V. A. Glebovitsky  N. N. Pertsev  S. Z. Yakovleva  A. M. Fedoseenko  Yu. V. Plotkina 《Doklady Earth Sciences》2006,408(1):538-541

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Polarization and photometric investigation of the peculiar galaxy NGC 3718     

V. A. Hagen-Thorn  I. I. Popov  V. A. Yakovleva 《Astrophysics》1981,17(1):17-22

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The 1999 M_w 6.0 earthquake sequence in the southern Baikal rift, Asia, and its seismotectonic implications     

Natalia Radziminovitch  Jacques Déverchère  Valentina Melnikova  Vladimir San'kov  Nadezhda Giljova 《Geophysical Journal International》2005,161(2):387-400

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A photometric study of the peculiar galaxy UGC 4332     

V. A. Yakovleva  V. A. Gagen-Torn  G. M. Karataeva 《Astronomy Reports》2000,44(8):523-529

BVR _c photometry of the galaxy UGC 4332 is presented. It is shown that its inclusion in a list of candidate galaxies with polar rings is erroneous. In reality, it is a spiral galaxy with a powerful bulge and a disturbed dust disk viewed edge-on.  相似文献   

Spectroscopic and photometric observations of symbiotic nova PU Vul during 2009–2016     

Anna Tatarnikova  Marina Burlak  Eugene Kolotilov  Natalia Metlova  Victor Shenavrin  Sergei Shugarov  Taisija Tarasova  Andrey Tatarnikov 《天文和天体物理学研究(英文版)》2018,(8)

A new set of low-resolution spectral and UBVJHKL-photometric observations of the symbiotic nova PU Vul is presented. The binary has been evolving after its symbiotic nova outburst in 1977 and now it is in the nebular stage. It is found that the third orbital cycle(after 1977) was characterized by great changes in associated light curves. Now, PU Vul exhibits a sine-wave shape in all the light curves(with an amplitude in the U band of about 0.7 mag), which is typical for symbiotic stars in the quiescent state. Brightness variability due to pulsations of the cool component is now clearly visible in the VRI light curves. The amplitude of the pulsations increases from 0.5 mag in the V band to 0.8 mag in the I band. These two types of variability, as well as a very slow change in the physical parameters of the hot component due to evolution after the outburst of 1977, influence the spectral energy distribution(SED)of the system. The variability of emission lines is highly complex. Only hydrogen line fluxes vary with orbital phase. An important feature of the third orbital cycle is the first emergence of the OVI, 6828  Raman scattering line. We determine the temperature of the hot component by means of the Zanstra method applied to the He II, 4686  line. Our estimate is about 150 000 K for the spectrum obtained near orbital maximum in 2014. The VO spectral index derived near pulsation minimum corresponds to M6 spectral class for the cool component of PU Vul.  相似文献