共查询到20条相似文献,搜索用时 46 毫秒
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<正>以"载人登月与深空探测"为主题的中国工程院科枝论坛于2010年11月5日在北京召开,包括30余位院士在内的航天及相关领域的领导、专家和学者出席了论坛。本次论坛旨在深入研讨载人登月与深空探测系统的技术需求和发展趋势,以及中国实施载人登月与深空探测的发展思路和设想,共同谋划中国载人登月与深空探测的未来发展。与会专家、学者针对载人登月与深空探测发展态势和科学目标,中国深空探测的成就和未来发展,中国载人 相似文献
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“深空探测是中国从航天大国迈向航天强国的必经之路,国家应该尽快制订深空探测的路线图,加强相关技术的预研工作。”在7月6日举行的由中国宇航学会承办的第七次中国科协论坛上,嫦娥一号卫星总设计师、中国科学院院士叶培建在谈到中国深空探测的未来发展时,着重强调了加速深空探测领域顶层设计的意义。 相似文献
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世界深空探测发展态势及展望 总被引:1,自引:0,他引:1
《国际太空》2015,(9)
<正>2015年7月14日,美国"新视野"探测器首次实现了冥王星的近距离探测,从而完成了太阳系原"九大行星"的探测,标志着人类行星际观测第一阶段任务的完成。此次探测历时3462天,跨越4.8×109km的距离,为人类50余年的深空探测历史划上了浓墨重彩的一笔。深空探测是世界航天领域最前沿的科技创新活动之一,不仅可以增进人类对宇宙空间未知领域、太阳系和生命起源的认识,还可以推动空间科技的发展,促进空间资源的开发和利用。因此,深空探测已成为世界各国未来航天领域发展的主要方向之一。 相似文献
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C. Sumners P. Reiff W. Weber 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008
The Houston Museum of Natural Science, in collaboration with Rice University has an outreach program taking portable digital theaters to schools and community sites for over five years and has conducted research on student learning in this immersive environment. By using an external independent evaluator, the effectiveness of NASA-funded Education and Public Outreach (EPO) projects can be assessed. This paper documents interactive techniques and learning strategies in full-dome digital theaters. The presentation is divided into Evaluation Strategies and Results and Interactivity Strategies and Results. All learners from grades 3–12 showed statistically significant short-term increase in knowledge of basic Earth science concepts after a single 22-min show. Improvements were more significant on items that were taught using more than one modality of instruction: hearing, seeing, discussion, and immersion. Thus immersive theater can be an effective as well as engaging teaching method for Earth and Space science concepts, particularly those that are intrinsically three-dimensional and thus most effectively taught in an immersive environment. The portable system allows taking the educational experience to rural and tribal sites where the underserved students could not afford the time or expense to travel to museums. 相似文献
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Samujjwal Ray Rajdeep Ray Mofazzal Hossain Khondekar Koushik Ghosh 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2018,61(8):2214-2226
A monthly average solar green coronal index time series for the period from January 1939 to December 2008 collected from NOAA (The National Oceanic and Atmospheric Administration) has been analysed in this paper in perspective of scaling analysis and modelling. Smoothed and de-noising have been done using suitable mother wavelet as a pre-requisite. The Finite Variance Scaling Method (FVSM), Higuchi method, rescaled range (R/S) and a generalized method have been applied to calculate the scaling exponents and fractal dimensions of the time series. Autocorrelation function (ACF) is used to find autoregressive (AR) process and Partial autocorrelation function (PACF) has been used to get the order of AR model. Finally a best fit model has been proposed using Yule-Walker Method with supporting results of goodness of fit and wavelet spectrum. The results reveal an anti-persistent, Short Range Dependent (SRD), self-similar property with signatures of non-causality, non-stationarity and nonlinearity in the data series. The model shows the best fit to the data under observation. 相似文献
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C.H. Jaroschek M. Hoshino H. Lesch R.A. Treumann 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,41(3):481-490
We address the problem of interacting relativistic current sheets in self-consistent kinetic plasma simulations within the framework of the Particle-In-Cell model. The interaction is enforced in head-on collisions of up to 10 current sheets at relativistic bulk speeds. The simulations are motivated by the general problem of Poynting flux dissipation in ‘striped wind’ configurations presumably governing the relativistic outflows pervasive in pulsar winds and gamma-ray bursts. We identify the generation of non-thermal particles and formation of a stable power-law shape in the particle energy distributions f(γ) dγ ∝ γ−s dγ. In 1D, a spectral index s ∼ 2 is observed and attributed to a stochastic Fermi-type acceleration mechanism. In 2D, the generic index of s ∼ 3–4 is retained as in previous simulations of individual current sheets. Whereas in 2D the high energy cut-off is constrained by the limited dissipation of magnetic energy, in 1D the process converts the bulk motion of current sheets towards directed particle momentum of an exclusive class of non-thermal particles. 相似文献
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A. Buch R. Sternberg C. Szopa C. Freissinet C. Garnier El J. Bekri C. Rodier R. Navarro-González F. Raulin M. Cabane M. Stambouli D.P. Glavin P.R. Mahaffy 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2009
In the frame of the 2009 Mars Science Laboratory (MSL) mission a new sample preparation system (SPS) compatible with gas chromatography–mass spectrometry (GC–MS) has been developed for the in situ analysis of complex organic molecules in the Martian soil. The goal is to detect, if they exist, some of the key compounds that play an important role in life on Earth including carboxylic acids, amino acids and nucleobases. 相似文献
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基于LuGre模型的电液加载系统摩擦补偿 总被引:4,自引:2,他引:2
为了提高电液加载系统控制精度,针对摩擦问题提出了基于LuGre摩擦模型的前馈补偿方法.建立了用于摩擦仿真分析和补偿器设计的电液加载系统数学模型;通过实验获取并分析了相关的摩擦数据;基于实验数据进行LuGre模型参数辨识,把LuGre模型和辨识结果引入电液加载系统数学模型,并进行仿真结果与实际摩擦数据的对照,证明了LuGre摩擦模型的准确性.设计前馈补偿器,进行了实验对比,实验结果表明前馈补偿器可将摩擦产生的控制误差有效地降至未补偿时的30%左右. 相似文献
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R.D. Bentley A. Csillaghy J. Aboudarham C. Jacquey M.A. Hapgood K. Bocchialini M. Messerotti J. Brooke P. Gallagher P. Fox N. Hurlburt D.A. Roberts L. Sanchez Duarte 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2011
Heliophysics is a new research field that explores the Sun–Solar System Connection; it requires the joint exploitation of solar, heliospheric, magnetospheric and ionospheric observations. 相似文献
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K. Clark J. Boldt R. Greeley K. Hand I. Jun R. Lock R. Pappalardo T. Van Houten T. Yan 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2011
Missions to explore Europa have been imagined ever since the Voyager mission first suggested that Europa was geologically very young. Subsequently, the Galileo spacecraft supplied fascinating new insights into this satellite of Jupiter. Now, an international team is proposing a return to the Jupiter system and Europa with the Europa Jupiter System Mission (EJSM). Currently, NASA and ESA are designing two orbiters that would explore the Jovian system and then each would settle into orbit around one of Jupiter’s icy satellites, Europa and Ganymede. In addition, the Japanese Aerospace eXploration Agency (JAXA) is considering a Jupiter magnetospheric orbiter and the Russian Space Agency is investigating a Europa lander. 相似文献
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S. Hekker 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2013
The space-borne observatories CoRoT (Convection Rotation and planetary Transits) and Kepler have provided photometric time series data of unprecedented precision for large numbers of stars. These data have revolutionized the fields of transiting exoplanets and asteroseismology. In this review some important asteroseismic results obtained using data from the CoRoT and Kepler space missions concerning stars that show solar-like oscillations are discussed. These results comprise, among others, measurements of the location of the base of the convection zone and helium second-ionization zone in main-sequence stars, the presence (or not) of core-helium burning in red-giant stars, as well as differential rotation in these stars. 相似文献
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Yu.A. Surkov 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》1981,1(8):21-38
In this report the main results of the study of radioactivity of the solar sistem bodies are considered. The radioactivity of the Moon and planets was measured by means of vehicles in situ. The radioactivity of the lunar samples, brought to the Earth was studied with laboratory equipment. 相似文献
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G.E. Dorrington 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2011
Various aerial platforms intended for long endurance survey of the Titan surface are presented. A few novel concepts are introduced, including a heated methane balloon and a balloon with a tethered wind turbine. All the concept options are predicted to have lower scientific payload fractions than the Huygens probe. It is concluded that the selection of the best aerial platform option depends on more accurate mass estimates and a clear decision on whether, or not, in situ surface composition measurements are required in conjunction with aerial remote sensing. 相似文献