Электронная библиотека Национальной библиотеки РС(Я). Групповой абонемент

8661.

Авторы:

Лебедев Михаил Петрович, Старостин Егор Гаврильевич, Сараев Юрий Николаевич, Слепцов Олег Ивкентьевич, Голиков Николай Иннокентьевич

Заглавие: Климатические испытания материалов, техники, конструкций, эксплуатирующихся в экстремальных условиях Севера и Арктики

Количество страниц: 3 с.

Подборки

В докладе описывается существующие проблемы эксплуатации материалов, техники и конструкций, эксплуатирующихся в условиях экстремальных низких температур. Указывается, что все материалы, используемые в сложных технических системах в течение 15 и более лет, при необходимости продления эксплуатации должны пройти проверку (климатическую квалификацию). Обоснована необходимость создания климатических полигонов для проведения натурных испытаний различных материалов, изделий техники и элементов конструкций на территории Якутии.

Климатические испытания материалов, техники, конструкций, эксплуатирующихся в экстремальных условиях Севера и Арктики / М. П. Лебедев, Е. Г. Старостин, Ю. Н. Сараев, О. И. Слепцов, Н. И. Голиков // Разработка материалов, адаптированных к природно-климатическим условиям Арктики, а также внедрения технических систем и приборной базы, адаптированных к выполнению сварочно-монтажных и ремонтных работ в условиях низких климатических температур : материалы III научно-технического семинара, Якутск, 8-9 декабря 2016 г. — Якутск : Сахаада, 2016. — С. 30-32.

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8662.

Авторы:

Махутов Николай Андреевич, Лебедев Михаил Петрович, Большаков Александр Михайлович

Заглавие: Исследование характеристик трещиностойкости и старения материалов металлоконструкций Севера после длительной эксплуатации

Количество страниц: 11 с.

Подборки

Рассмотрены разрушения и повреждения трубопроводов и оборудования газовой промышленности при их длительной эксплуатации в условиях Арктики и показана их взаимосвязь с деградацией физико-механического состояния металла конструкций.

Махутов, Н. А. Исследование характеристик трещиностойкости и старения материалов металлоконструкций Севера после длительной эксплуатации / член-корреспондент РАН, доктор технических наук Н. А. Махутов, член-корреспондент РАН, доктор технических наук М. П, Лебедев, доктор технических наук, профессор РАН А. М. Большаков // Хладостойкость. Новые технологии для техники и конструкций Севера и Арктики : труды Всероссийской конференции с международным участием, посвященной 70-летию профессора-механика, доктора технических наук А. В. Лыглаева. — Якутск : Издательский дом СВФУ, 2016. — С. 30-40.

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8663.

Автор:

Лебедев Михаил Петрович

Заглавие: Перспективы технологий нанесения защитных покрытий на детали техники для Севера

Количество страниц: 7 с.

Подборки

Целью явилась разработка составов и технологии получения оплавляемых плазменных покрытий с твердой смазкой.

Лебедев, М. П. Перспективы технологий нанесения защитных покрытий на детали техники для Севера / М. П. Лебедев // Хладостойкость материалов и элементов конструкций : результаты и перспективы. — Новосибирск : Наука, 2005. — С. 253-259.

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8664.

Авторы:

Larionov Vladimir Petrovich, Bolotina Natalya Pavlovna, Аrgunova T. V., Tyunin Vladimir Denisovich, Lebedev Michail Petrovich

Заглавие: Laser processing of plasma sprayed coatings

Издательство: [s. n.]

Год выпуска: 1988

Количество страниц: 14 с.

Подборки

The influence of continious CO2-laser processing on structure, composition and microhadness of plasma sprayed Ni-Cr-Si-B, Fe-C-Cr-V, Ni-Al coatings was studied. The change of chemical and phase compositions of the coatings compared with the initial sprayed ones due to alloying with elements of substrate, depending on the processing operation (input power) was determined. Laser processing of plasma sprayed coatings allows to improve substantially their adhesion and in combination with high speed cooling, gives the possibility to regulate the processes of structure formation, dispersion, phase formation, and hence, the properties of forming coatings by means of processing operation.

Laser processing of plasma sprayed coatings / Dr. V. P. Larionov, Cand. N. P. Bolotina, Eng. T. V. Argunova, Cand. V. D. Tyunin, Eng. M. P. Lebedev. — [S. l. : s. n.], 1988. — 6 c.

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8665.

Авторы:

Baishev Dmitriy Gavrilievich, Barkova Elena Sergeevna, Solovyev Stepan Ivanovich, Yumoto Kiyohumi, Engebretson Mark, Koustov A. V.

Заглавие: Formation of large-scale, "giant" undulations at the equatorial boundary of diffuse aurora and Pc5 magnetic pulsations during the January 14, 1999 magnetic storm

Количество страниц: 4 с.

Подборки

In the present study we investigate the undulations at the equatorial boundary of diffuse aurora and their relationship to the development of magnetic and auroral substorms and excitation of Pc5 magnetic pulsation on January 14, 1999. The observed undulations had wave-length of ~200-300 km and amplitude of ~50-250 km and they propagated westward with the velocity of ~0,7 km/s. It is found that the undulations began ~40 min after the substorm onset and lasted for ~80 min, all the way to the end of the substorm. During both active and recovery phases of the substorm the undulations were accompanied by the enhancement of the DP2 equivalent current system and by the formation of WTS. Concurrently with undulations, there were observed Pc5 magnetic pulsations of an oscillation period roughly equal to the ratio of the undulation wavelength to their propagation velocity. Observations are interpreted in terms of the shear/ballooning instability excitation near the plasmapause and subsequent generation of drift hydromagnetic waves.

Formation of large-scale, "giant" undulations at the equatorial boundary of diffuse aurora and Pc5 magnetic pulsations during the January 14, 1999 magnetic storm / D. G. Baishev, E. S. Barkova, S. I. Solovyev, K. Yumoto, M. J. Engebretson and A. V. Koustov // Proceedings of the Fifth International Conference on Substorms : 16-20 May 2000 Congress Centre of the Arctic and Antarctic Research Institute, St. Petersburg, Russia. − Noordwijk, Netherlands : European Space Agency, 2000. − P. 427-430.

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8666.

Автор:

Boroyev Roman Nikolaevich

Заглавие: Dynamics of the field-aligned current during substorms with a sharp onset of the expansion phase

Количество страниц: 4 с.

Подборки

By using satellite magnetic field measurements it is shown that before the substorm expansion phase onset the field-aligned currents of zone 2 type are not always observed on the geosynchronous orbits at the midnight sector. The relationship between the appearance of the field-aligned currents of zone 2 types before the beginning of the substorm expansion phase and the active phase duration and the preceding magnetic disturbance level has been found. It is found that if the expansion phase lasts less than 11 min, the appearance probability of the field-aligned current of zone 2 type before the substorm expansion phase onset T0 decreases. As the geomagnetic activity rises before a substorm, the probability of the beginning of the field-aligned currents before T0 increases. These results indicate that substorms in which the field-aligned currents of zone 2 type the T0 onset are absent, can be probably developed in the distant part of the magnetotail.

Boroyev, R. N. Dynamics of the field-aligned current during substorms with a sharp onset of the expansion phase / R. N. Boroyev // Proceedings of the Fifth International Conference on Substorms : 16-20 May 2000 Congress Centre of the Arctic and Antarctic Research Institute, St. Petersburg, Russia. − Noordwijk, Netherlands : European Space Agency, 2000. − P. 377-380.

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8667.

Авторы:

Boroyev Roman Nikolaevich, Velichko Vitaly Andreevich, Baishev Dmitriy Gavrilievich

Заглавие: Local increase of field-aligned current intensity before a substorm onset

Количество страниц: 4 с.

Подборки

By using data treatment results of mid-latitude geomagnetic variations, the significant increase of the local current system intensity with the eastern direction current system, arising near the meridian of expected substorm center ~10-30 min before the break-up onset, has been found. A comparison of longitudinal sizes of two current system, forming the substorm disturbance before and after the onset of the substorm expansion phase, has been carried out. The longitudinal size of the current loop of the substorm growth phase is nearly twice as small as azimuth scale of the substorm current wedge, and the current strength is as week as 2.7-12 times.

Boroyev, R. N. Local increase of field-aligned current intensity before a substorm onset / R. N. Boroyev, V. A. Velichko, D. G. Baishev // Proceedings of the Fifth International Conference on Substorms : 16-20 May 2000 Congress Centre of the Arctic and Antarctic Research Institute, St. Petersburg, Russia. − Noordwijk, Netherlands : European Space Agency, 2000. − P. 279-282.

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8668.

Авторы:

Boroyev Roman Nikolaevich, Gelberg Mikhail Germanovich

Заглавие: Dependence of longitudinal localization of substorm center on geosynchronous orbits on the IMF Bγ-component

Количество страниц: 4 с.

Подборки

The dependence of the longitudinal substorm center localisation on geosynchronous orbits on the IMF Bγ-component has been studied. It is shown that the local magnetic time of the longitudinal substorm center localisation in the magnetosphere varies from evening hours to morning hours as the Bγ-component increases. At low solar wind speeds the substorm centers localize nearer to the evening sector. The ionospheric projection of the substorm center magnetospheric localisation shifts westward at By0. Maximum longitudinal shifts of substorm centers in the ionosphere relative to their location in the magnetosphere are - 3.5 h at Bγ=-4 nT and 3.5 h at Bγ=4.4 nT. Thus, the change of the substorm center localisation relative to the midnight in the ionosphere is caused by both the change of the substorm center position in the magnetosphere and a turn of the magnetotail relative to X-axis.

Boroyev, R. N. Dependence of longitudinal localization of substorm center on geosynchronous orbits on the IMF Bγ-component / R. N. Boroyev, M. G. Gelberg // Proceedings of the Fifth International Conference on Substorms : 16-20 May 2000 Congress Centre of the Arctic and Antarctic Research Institute, St. Petersburg, Russia. − Noordwijk, Netherlands : European Space Agency, 2000. − P. 41-44.

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8669.

Автор:

Gavrilyeva Galina Alekseevna

Заглавие: Measurements of the mesosphere temperature by two molecular emissions in Yakutsk (62°N, 129,5°E)

Количество страниц: 4 с.

Подборки

The results of the hydroxyl and oxygen molecules rotational temperature measurements during two observational seasons 1999-2001 at Maymaga station (φ=63°N;λ=129.50°E) are presented. The rotational temperatures of OH(6,2) and O2 (0,1) bands have been measured with the infrared spectrograph equipped by the cooled CCD registration system. It is shown that the amplitude of seasonal change of hydroxyl rotational temperature is greater than the molecular oxygen variation. OH temperatures have been systematically higher the O2 ones during winter. An abrupt decrease of the O2 intensity connected with the springtime transition of the atmospheric circulation is found in both time series. For the first time a change of the temperature vertical gradient sign caused by mesopause height displacemet to a higher (winter) level was shown in the data of August-September 2001.

Gavrilyeva, G. A. Measurements of the mesosphere temperature by two molecular emissions in Yakutsk (62°N, 129,5°E) / G. A. Gavrilyeva // Physics of auroral phenomena : proceedings of the 26th annual seminar, 25 - 28 February 2003. – 2003. – P. 198-201.

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8670.

Авторы:

Ammosov Petr Petrovich, Gavrilyeva Galina Alekseevna

Заглавие: Observations of short-term waves with an all sky camera in the infrared oh brightness over Yakutsk

Количество страниц: 3 с.

Подборки

Statistical analysis of internal gravity wave parameters registered by variations of the hydroxyl molecule emission is presented. The wave structures are detected with an all sky infrared camera at the optical station of Maimaga (φ=63° N; λ=129.50°E geographic). The data obtained for the period of 1998 to 2002 show that the small-scale internal gravity waves propagate predominantly westward. The observed wavelengths vary from 15.4 to 100 km. (the average value is ~40 km), the horizontal phase speeds are between 19 and 166 m s-¹ (the average value is ~63 m s-¹) and the estimated periods are 9-90 min (the average value is ~17 min). The wavelengths and phase speeds at high latitudes is probably due to the large intensities of the filtering winds compared to those in the middle atmosphere. The short waves (wavelengths shorter than 17.5 km) propagate in the same direction as the long ones.

Ammosov, P. P. Observations of short-term waves with an all sky camera in the infrared oh brightness over Yakutsk / P. P. Ammosov, G. A. Gavrilyeva // Physics of auroral phenomena : proceedings of the 26th annual seminar, 25 -28 February 2003. – 2003. – P. 179-181.

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