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247 results on '"Alexeev V"'

3. Study of the Pallasite Radiation History by Track Analysis

Author

Alexeev, V. A., Bagulya, A. V., Volkov, A. E., Gippius, A. A., Goncharova, L. A., Gorbunov, S. A., Grachev, V. M., Dashkina, A. B., Kalinina, G. V., Konovalova, N. S., Okateva, N. M., Pavlova, T. A., Polukhina, N. G., Starkov, N. I., Soe, Than Naing, Chernyvsky, M. M., and Shchedrina, T. V.

Published
2019
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32. Measurement of the πmeson polarizabilities via the γp → γπ+n reaction

Author

Ahrens, J., Alexeev, V. M., Annand, J. R. M., Arends, H. J., Beck, R., Caselotti, G., Cherepnya, S. N., Drechsel, D., Fil’kov, L. V., Föhl, K., Giller, I., Grabmayr, P., Hehl, T., Hornidge, D., Kashevarov, V. L., Kotulla, M., Krambrich, D., Krusche, B., Lang, M., McGeorge, J. C., MacGregor, I. J. D., Metag, V., Moinester, M., Novotny, R., Pfeiffer, M., Rost, M., Schadmand, S., Scherer, S., Thomas, A., Unkmeir, C., and Walcher, Th.

Published
2005
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41. Design of new hollow superconducting NbTi cables for fast cycling synchrotron magnets

Author

Khodzhibagiyan, H., Alexeev, V., Averichev, S., Drobin, V., Kovalenko, A., Smirnov, A., Starikov, A., Vladimirova, N., Moritz, G., Fischer, E., Potanina, L., Shikov, A., and Vedernikov, G.

Subjects
Acceleration (Mechanics) -- Observations, Dipole moments -- Research, Superconductive devices -- Research, Business, Electronics, Electronics and electrical industries
Abstract

Investigating two new options for hollow superconducting cables aimed at increasing structural current density were proposed and designed in the frameworks of R&D program for the future accelerator facility at GSI is presented. The data from cable short sample test are presented.

Published
2003

48. Agreement of Analytical and Simulation‐Based Estimates of the Required Land Depth in Climate Models.

Author

Steinert, N. J., González‐Rouco, J. F., Melo Aguilar, C. A., García Pereira, F., García‐Bustamante, E., de Vrese, P., Alexeev, V., Jungclaus, J. H., Lorenz, S. J., and Hagemann, S.

Subjects
ATMOSPHERIC models, EFFECT of human beings on climate change, LAND-atmosphere interactions, HEAT storage, HEAT conduction
Abstract

Previous analytical and simulation‐based analyses suggest that deeper land surface models are needed to realistically simulate the terrestrial thermal state in climate models, with implications for land‐atmosphere interactions. Analytical approaches mainly focused on the subsurface propagation of harmonics such as the annual temperature signal, and a direct comparison with climate‐change model output has been elusive. This study addresses the propagation of a harmonic pulse fitted to represent the timescale and amplitude of anthropogenic warming. Its comparison to land model simulations with stepwise increased bottom boundary depth leads to an agreement between the simulation‐based and analytical frameworks for long‐term climate trends. Any depth increase gradually decreases the relative error in the subsurface thermodynamics, and a minimum depth of 170 m is recommended to simulate the ground climate adequately. The approach provides an accurate estimate of the required land‐model depth for climate‐change simulations and assesses the relative bias in insufficiently deep land models. Plain Language Summary: Many current‐generation climate models have land components that are too shallow. Under climate change conditions, the long‐term warming trend at the surface propagates deeper into the ground than the commonly used 3–10 m. Shallow models alter the terrestrial heat storage and distribution of temperatures in the subsurface, influencing the simulated land‐atmosphere interactions. Previous studies focusing on annual timescales suggest that deeper models are required to match subsurface‐temperature observations and the classic analytical heat conduction solution. However, for a systematic investigation of land‐model deepening in the frame of anthropogenic climate change, the classic analytical solution is inaccurate because it does not mimic the timescale and amplitude of the simulated warming trend. This study intends to bridge the gap between analytical and simulation‐based estimates of the subsurface thermodynamic state by adapting the classic analytical framework to mimic long‐term anthropogenic warming. The analysis shows that a land‐model depth of at least 170 m is recommended for a proper simulation of the post‐1850 ground climate, which differs up to 30% from the estimate of the classic approach. Compared to previous studies, this provides an accurate estimate of the required land model depth for long‐term climate‐change simulations and indicates the relative bias in insufficiently deep land models. Key Points: Heat conduction from analytical and numerical estimates suggests a required land‐model depth of 170 m for climate change simulationsAgreement between numerical and analytical estimates on climate change timescales gives more confidence for the required land‐model depthStepwise land‐model depth increase gradually reduces the relative error of shallow models in climate‐change simulations [ABSTRACT FROM AUTHOR]

Published
2021
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50. Peculiarities of distributions of the cosmic-ray exposure ages of H chondrite falls and finds

Author

Alexeev, V. A

Subjects
Astrophysics
Abstract

Well known peak in the distribution of the cosmic-ray exposure ages of H chondrites at 6-7 My can be employed as mark in comparison of different populations of H chondrites. It is found the age corresponding to maximum of peak for non-Antarctic falls is higher by (15+/-5) percent of this for non-Antarctic finds. Antarctic H chondrites occupy intermediate position. This effect is probably due to process of weathering.

Published
1993

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