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991.
The basic principles of selecting some design parameters of a lightweight airplane for the contemporary Russian market are presented. Recommendations for selecting these parameters with the service requirements specified are given based on the study performed. 相似文献
992.
The possibility of using solar sails in Earth orbit is investigated. The characteristic parameters of a solar sail consisting of six spheres attached by mutually orthogonal long rods are estimated. 相似文献
994.
995.
本文以北华航天工业学院图书馆的电子显示屏的使用为例,介绍了高校图书馆电子显示屏通过一定的控制方式显示文字、图形、二维或三维动画、电视等各种信息的方法,实现文本、图像、视频等多种内容形式的播放,彰显出电子显示屏在图书馆对外宣传服务中的优越性。 相似文献
996.
The Monitor-E spacecraft executed uncontrolled flight due to emergency situation, no telemetry information on parameters of the spacecraft’s
attitude motion being available. So, the problem arose to determine the spacecraft’s rotational motion from the accessible
indirect information—the electric current provided by solar batteries. In this paper the integrated statistical technique
is described, that allows one to solve this problem. The values of current, obtained over the time interval some tens of minutes
long, have been processed simultaneously by the least squares method using the integration of the equations of spacecraft’s
rotational motion. As a result of processing, the initial conditions of motion were estimated, and the spacecraft’s moments
of inertia were updated, as well as the angles, specifying solar batteries position in the spacecraft-fixed coordinate system.
The results of processing of 12 data sets are presented, which allowed us to reconstruct the actual rotational motion of the
spacecraft. 相似文献
997.
The introduction of a satisfactory instrument landing system making use of existing ILAS radio systems would be of great economic value to the airline industry, and to other aeronautical activities requiring flying under low-visibility weather conditions. It is the purpose of this correspondence to indicate a possible solution to this problem of many years' standing, and to comment on the use of existing facilities as the basis for this solution. 相似文献
998.
Nicole D. Buckley Claude P. Champagne Adriana I. Masotti Lisa E. Wagar Thomas A. Tompkins Julia M. Green-Johnson 《Acta Astronautica》2011,68(7-8):731-738
Astronauts face numerous health challenges during long-duration space missions, including diminished immunity, bone loss and increased risk of radiation-induced carcinogenesis. Changes in the intestinal flora of astronauts may contribute to these problems. Soy-based fermented food products could provide a nutritional strategy to help alleviate these challenges by incorporating beneficial lactic acid bacteria, while reaping the benefits of soy isoflavones. We carried out strain selection for the development of soy ferments, selecting strains of lactic acid bacteria showing the most effective growth and fermentation ability in soy milk (Streptococcus thermophilus ST5, Bifidobacterium longum R0175 and Lactobacillus helveticus R0052). Immunomodulatory bioactivity of selected ferments was assessed using an in vitro challenge system with human intestinal epithelial and macrophage cell lines, and selected ferments show the ability to down-regulate production of the pro-inflammatory cytokine interleukin-8 following challenge with tumour necrosis factor-alpha. The impact of fermentation on vitamin B1 and B6 levels and on isoflavone biotransformation to agluconic forms was also assessed, with strain variation-dependent biotransformation ability detected. Overall this suggests that probiotic bacteria can be successfully utilized to develop soy-based fermented products targeted against health problems associated with long-term space travel. 相似文献
999.
Quaternion regularization and trajectory motion control in celestial mechanics and astrodynamics: II
Yu. N. Chelnokov 《Cosmic Research》2014,52(4):304-317
Problems of regularization in celestial mechanics and astrodynamics are considered, and basic regular quaternion models for celestial mechanics and astrodynamics are presented. It is shown that the effectiveness of analytical studies and numerical solutions to boundary value problems of controlling the trajectory motion of spacecraft can be improved by using quaternion models of astrodynamics. In this second part of the paper, specific singularity-type features (division by zero) are considered. They result from using classical equations in angular variables (particularly in Euler variables) in celestial mechanics and astrodynamics and can be eliminated by using Euler (Rodrigues-Hamilton) parameters and Hamilton quaternions. Basic regular (in the above sense) quaternion models of celestial mechanics and astrodynamics are considered; these include equations of trajectory motion written in nonholonomic, orbital, and ideal moving trihedrals whose rotational motions are described by Euler parameters and quaternions of turn; and quaternion equations of instantaneous orbit orientation of a celestial body (spacecraft). New quaternion regular equations are derived for the perturbed three-dimensional two-body problem (spacecraft trajectory motion). These equations are constructed using ideal rectangular Hansen coordinates and quaternion variables, and they have additional advantages over those known for regular Kustaanheimo-Stiefel equations. 相似文献
1000.
A rigorous theory is developed for the course scalloping amplitudes observed in the bearing indications of an airborne standard VOR receiver in the presence of multipath signals. The VOR transmitting antenna pattern characteristics, the scattering properties of the multipath source, and the effects of ground reflection are all built into the theory so that their combined effects on the scalloping may be quantitatively investigated. The analysis assumes that the VOR receiver characteristics are ideal. 相似文献