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1.
E. A. Agafonov N. A. Sorokina Yu. A. Prokhorenko E. E. Pavlova 《Physical Oceanography》1995,6(5):395-397
This paper discussesin situ observational data on the directed light attenuation index in the near-surface layer, collected in September 1987. The absolute light attenuation index has been evaluated for a near-shore strip of water 10–15 miles in width. When multidisciplinary research is conducted in the open sea, this part of the sea surface remains unstudied, as the observational grid for it is made larger than the spatial-temporal parameters of the biophysical processes producing optical inhomogeneities.Translated by Vladimir A. Puchkin. 相似文献
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This article is an English translation of the work cited in 46: 3092. The authors review the conclusions of Pivovarov (see 44: Title 3118) concerning the nature of the urbanization process and optimal city size in the USSR. The relationship between urbanization and the characteristics of a given socioeconomic system is examined, and the possibility of determining optimal size for cities of different functional types is evaluated 相似文献
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Bubukin I. T. Rakut I. V. Agafonov M. I. Yablokov A. A. Pankratov A. L. Gorbunova T. Yu. Gorbunov R. V. 《Astronomy Reports》2021,65(7):598-614
Astronomy Reports - The feasibility of expanding the evaluation parameters was discussed when selecting the “Karadag” test site for the installation of millimeter-wave antennas based on... 相似文献
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Oceanology - The bearded seal occurs in virtually all Arctic seas. During the spring (pupping and mating season), this species is characterized by high underwater acoustic activity; studies... 相似文献
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The results of analysis of the output parameters of small-sized seismic motion sensors based on molecular electronics are presented. These devices feature a molecular-electronic transducer with negative feedback the introduction of which makes it possible to improve the sensor performance (specifically, to broaden the frequency range, reduce the amplitude-frequency characteristic (AFC) unevenness, and reduce the nonlinear distortion factor (NDF) value). The operating principle of these devices is outlined. The basic characteristics such as AFC, NDF, and the inherent noise level are determined experimentally, and the methods of their determination are described. The obtained data are analyzed and compared to the data on similar foreign devices. Principal lines of further research aimed not only at improving the technical characteristics but also at establishing a serial production process are specified. 相似文献
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The underwater vocalizations of the beluga whale summering in Onega Bay (64°24′N, 35°49′E) were recorded in June–July of 2008.
The vocalizations were classified into five major whistle types, four types of pulsed tones, click series, and noise vocalizations.
To determine the relationship between the behavioral activity and the underwater vocalizations, a total of fifty-one 2 minute-long
samples of the audio records were analyzed in the next six behavioral contexts: directional movements, quiet swimming, resting,
social interactions, individual hunting behavior, and the exploration of hydrophones by beluga whales. The overall vocalization
rate and the percentage of the main types of signals depend on the behavior of the belugas. We suggest that one of the whistle
types (the “stereotype whistle”) is used by belugas for long-distance communications, while other whistle types (with the
exception of “squeaks”) and three types of pulsed tones (with the exception of “vowels”) are used for short distance communication.
The percentage of “squeaks” and “vowels” was equally high in all the behavioral situations. Thus, we assume that “squeaks”
are contact signals. “Vowels” have a specific physical structure and probably play a role in identification signals. A high
rate of the click series was observed in the process of social interactions. 相似文献
8.
A.I. Chepurov E.I. Zhimulev L.V. Agafonov V.M. Sonin A.A. Chepurov A.A. Tomilenko 《Russian Geology and Geophysics》2013,54(4):406-415
It is generally accepted that the composition of ultrabasic nodules and their quantitative proportions do not significantly change during their transportation with kimberlitic magma to the Earth’s surface. We performed an experimental study of the relative stability of olivine, garnet, and pyroxenes in kimberlite melt at high pressure and temperatures (4 GPa, 1300–1500 °C). The study has shown that the loss in weight of minerals and, correspondingly, the rate of their dissolution in kimberlite melt differ considerably. The following sequence of the dissolution rates of minerals has been established: Cpx ≥ Opx > Gar > Ol. Pyroxenes are characterized by the most rapid dissolution, and olivine is the most stable mineral. The assumption is made that clinopyroxenites and websterites disintegrate more rapidly than dunites and lherzolites in kimberlitic magma. 相似文献
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We develop a radio astronomical approach to 3D‐reconstruction in few projections tomography. It is based on the 2‐CLEAN DSA method which consists of two clean algorithms by using a synthesized beam. In complex cases two extreme solutions are used for the analysis of the image structure. These solutions determine the limits of permissible energy redistribution on the image among the components of small and large scales. Two variants of 3D‐reconstruction proceeding from a set of two‐dimensional projections (3D2D) and from a set of one‐dimensional ones (3D1D) are considered. It is shown that the quality of 3D2D‐reconstruction should be similar to the quality of 2D1D‐reconstruction if the same number of equally spaced scans is used. But a doubled number of projections is required for 3D1D‐reconstruction. We have simulated 3D‐reconstruction of an optically thin emitting object. The present technique is a component of astrotomography and it has good prospects for a wide range of remote sensing. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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E. A. Agafonov S. T. Kaminsky A. S. Kukushkin Yu. A. Prokhorenko 《Physical Oceanography》2000,10(4):351-364
On the basis of the results of simultaneous observations of parameters of currents, attenuation factor of light, and temperature
performed aboard a moving vessel, we established the main characteristics and features of the circulation of waters and the
structure of transparency and temperature fields in the surface layer of the northwest part of the Black Sea. We investigate
the correlation between the variability of fluid dynamics and redistribution of transparency and temperature fields. The measured
currents are compared with those calculated using the actual field of atmospheric pressure during the time of observation.
It is shown that the results obtained in the areas of steady currents in the west and central regions are in good agreement.
Translated by Peter V. Malyshev and Dmitry V. Malyshev 相似文献