排序方式： 共有29条查询结果，搜索用时 15 毫秒
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N. N. Bursov Yu. N. Pariĭskiĭ E. K. Maĭorova M. G. Mingaliev A. B. Berlin N. A. Nizhel’skiĭ I. A. Glushkova T. A. Semenova 《Astronomy Reports》2007,51(3):197-214
A catalog of radio sources detected in a deep RATAN-600 survey is presented. The catalog was obtained in the region 0h ≤ RA2000.0 ≤ 24h, Dec2000.0 = 41°30′42″ ± 2′, at the declination of the bright radio source 3C 84. There were nine sessions of multi-wavelength observations at wavelengths λ = 1–55 cm, and more than 300 daily scans were accumulated at each wavelength. This is the first stage in the reduction of an extensive database accumulated by the Cosmological Gene Project. The RATAN-600 Zenith Field (RZF) catalog was obtained at the central wavelength of 7.6 cm, and contains 437 radio sources, virtually all of which have been identified with NVSS objects. Most of the flux densities for the catalog sources are above the 5σ level. Noise from faint (mainly new) background sources at a level of about 0.8 mJy has been detected. The minimum flux density of the catalog, 2.5 mJy, is comparable to the flux-density linit of the NVSS catalog. The catalog is more than 80% complete for sources with flux densities >3 mJy. 相似文献
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E. V. Glushkova S. E. Koposov I. Yu. Zolotukhin Yu. V. Beletsky A. D. Vlasov S. I. Leonova 《Astronomy Letters》2010,36(2):75-85
Automated search for star clusters in J, H, K
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data from 2MASS catalog has been performed using the method developed by Koposov et al. (2008). We have found and verified
153 new clusters in the interval of the galactic latitude −24° < b < 24°. Color excesses E(B − V), distance moduli and ages were determined for 130 new and 14 yet-unstudied known clusters. In this paper, we publish a catalog
of coordinates, diameters, and main parameters of all the clusters under study. A special web-site available at has been developed to facilitate dissemination and scientific usage of the results. 相似文献
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R. K. S. Yadav S. I. Leonova R. Sagar E. V. Glushkova 《Journal of Astrophysics and Astronomy》2014,35(2):143-156
We present U B V I CCD photometric observations obtained in the field of open clusters SAI 63 and SAI 75. CCD optical data obtained for the first time for these clusters are used to derive the fundamental parameters of the clusters. Stellar surface density profile indicates that radii of SAI 63 and SAI 75 are ～3′.5 and 2′.5 respectively. The reddenings E(B?V) are 0.44±0.05 and 0.34±0.05 mag for SAI 63 and SAI 75 respectively while the corresponding distances are 2.2 ± 0.2 and 3.5±0.3 kpc. An age of 450 ± 50 Myr for SAI 63 and 90 ± 10 Myr for SAI 75 is determined using the theoretical isochrones of Z=0.019. Our analysis shows that reddening law is normal towards SAI 75. 相似文献
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Afanasiev V. P. Nikolenko E. I. Glushkova N. V. Zolnikov I. D. 《Geology of Ore Deposits》2019,61(4):381-390
Geology of Ore Deposits - A new Massadou kimberlite field, was discovered in southeastern Guinea, near the town of Macenta. It consists of 16 poorly diamondiferous kimberlite dikes, ~1 m thick on... 相似文献
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N. N. Lashinskiy I. D. Zolnikov N. V. Glushkova 《Izvestiya Atmospheric and Oceanic Physics》2013,49(9):1029-1035
A new method for forest mapping utilizing high-resolution satellite images has been developed by a case study of the Novosibirsk Akademgorodok. Guided classifications of summer and fall QuickBird images, overlay operations, and grid density analysis form the background for this method. This method was used to construct maps of forest density and quantitative ratios of softwood to hardwood tree species. A comparison with the traditional geobotanical mapping has demonstrated several advantages of the remote sensing approach (including the precise definition of boundaries as well as high accuracy of estimation of the canopy density and the ratio of soft- to hardwood tree species) and shortcomings. The proposed method is not intended to replace but rather supplement and quantitatively improve the traditional approach. Matching the integral forest map and the corresponding geological-geomorphological map makes it possible to reveal the correlations between specific geomorphological features of the area, the composition of surface deposits, and the forest stand structure and thus estimate the degree of anthropogenic transformation in the natural forest ecosystems. In turn, this may be useful when organizing ecosystem monitoring. 相似文献
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A. V. Lozhkin T. A. Brown P. M. Anderson O. Yu. Glushkova I. V. Melekestsev 《Russian Journal of Pacific Geology》2016,10(4):249-262
Developing continuous chronologies of paleoenvironmental change in northern areas of the Far East using 14C can be problematic because of the low organic content in lake sediments. However, Holocene age-models can be supplemented by widespread tephra deposits reported in the Magadan region. The best documented of these tephras has been correlated to the KO tephra from southern Kamchatka dated to 7600 BP. Although a key chronostratigraphic marker, no detailed compendium of the distribution of this tephra and its associated 14C dates has been available from sites in the northern Far East. We provide such a summary. Known locally as the Elikchan tephra, lake cores indicate an ash fall that extended ~1800 km north of the Kamchatkan caldera with a ~500 km wide trajectory in the Magadan region. Other Holocene tephras preserved in lake sediments have poorer age control and possibly date to ~2500 BP, ~2700 BP and ~6000 BP. These ashes seem to be restricted to coastal or near-coastal sites. A single record of a ~25,000 BP tephra has also been documented ~100 km to the northeast of Magadan. 相似文献