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901.
    
Lauretta  D. S.  Balram-Knutson  S. S.  Beshore  E.  Boynton  W. V.  Drouet d’Aubigny  C.  DellaGiustina  D. N.  Enos  H. L.  Golish  D. R.  Hergenrother  C. W.  Howell  E. S.  Bennett  C. A.  Morton  E. T.  Nolan  M. C.  Rizk  B.  Roper  H. L.  Bartels  A. E.  Bos  B. J.  Dworkin  J. P.  Highsmith  D. E.  Lorenz  D. A.  Lim  L. F.  Mink  R.  Moreau  M. C.  Nuth  J. A.  Reuter  D. C.  Simon  A. A.  Bierhaus  E. B.  Bryan  B. H.  Ballouz  R.  Barnouin  O. S.  Binzel  R. P.  Bottke  W. F.  Hamilton  V. E.  Walsh  K. J.  Chesley  S. R.  Christensen  P. R.  Clark  B. E.  Connolly  H. C.  Crombie  M. K.  Daly  M. G.  Emery  J. P.  McCoy  T. J.  McMahon  J. W.  Scheeres  D. J.  Messenger  S.  Nakamura-Messenger  K.  Righter  K.  Sandford  S. A. 《Space Science Reviews》2017,212(1-2):925-984

In May of 2011, NASA selected the Origins, Spectral Interpretation, Resource Identification, and Security–Regolith Explorer (OSIRIS-REx) asteroid sample return mission as the third mission in the New Frontiers program. The other two New Frontiers missions are New Horizons, which explored Pluto during a flyby in July 2015 and is on its way for a flyby of Kuiper Belt object 2014 MU69 on January 1, 2019, and Juno, an orbiting mission that is studying the origin, evolution, and internal structure of Jupiter. The spacecraft departed for near-Earth asteroid (101955) Bennu aboard an United Launch Alliance Atlas V 411 evolved expendable launch vehicle at 7:05 p.m. EDT on September 8, 2016, on a seven-year journey to return samples from Bennu. The spacecraft is on an outbound-cruise trajectory that will result in a rendezvous with Bennu in November 2018. The science instruments on the spacecraft will survey Bennu to measure its physical, geological, and chemical properties, and the team will use these data to select a site on the surface to collect at least 60 g of asteroid regolith. The team will also analyze the remote-sensing data to perform a detailed study of the sample site for context, assess Bennu’s resource potential, refine estimates of its impact probability with Earth, and provide ground-truth data for the extensive astronomical data set collected on this asteroid. The spacecraft will leave Bennu in 2021 and return the sample to the Utah Test and Training Range (UTTR) on September 24, 2023.

  相似文献   
902.
Electromechanical Actuation Technology for the All-Electric Aircraft   总被引:1,自引:0,他引:1  
Electromechanical actuation is a critical element that must be developed and verified to make the all-electric aircraft a viable concept. For several years the Flight Control Division of the Air Force Wright Aeronautical Laboratories has sponsored activities to demonstrate the credibility of electromechanical actuation systems (EMAS) for primary flight control actuation functions. The foundation for these EMAS activities and several electromechanical actuation development programs are described here. One involves the design, fabrication, and laboratory test of a rotary, hingeline electromechanical actuator. Another involves the development and flight test demonstration of a linear electromechanical actuator for controlling an aileron of a C-141 aircraft. A third involves the design and development of a linear electromechanical actuator for missiles having severe performance, temperature, and volumetric requirements. In addition, a brief summary of the results from two aircraft actuation trade studies compare the baseline (conventional) hydraulic flight control system with an all-electric airplane concept including quantitative comparisons of weight, reliability and maintainability, and life cycle costs.  相似文献   
903.
H.O. Ruppe 《Acta Astronautica》1985,12(11):963-965
This note summarizes some fundamentals on light-sailing systems. Light-sailing was the subject of a letter published in A & A Journal of January 1983, p. 6. Hence, it might be of interest to summarize some fundamentals of such systems.  相似文献   
904.
The effects of frequency multiplication circuits on the short-term stability of an oscillator system are analyzed. The short-term stability of real components such as varactor multipliers are compared to the short-term stability of an ?ideal? frequency multiplier which maintains the stability of the basic oscillator. In addition, it is shown that positive feedback like that used in a synchronized oscillator, while useful for tracking, degrades short-term stability.  相似文献   
905.
906.
Is it a plane?     
An international colloquium on the Spaceplane and the Law was organized by the French Society for Air and and Space Law, with the help of the European Space Agency, the French Civil Aviation Authority, the Centre National d'Etudes Spatiales (CNES) and Air France, and had ICAO, Eurocontrol and the French Ministries of Foreign Affairs, Transport, PTT and Research as its patrons. The purpose of the colloquium was to create awareness of the legal problems that may arise when spaceplanes become reality, and to propose solutions to those problems. The colloquium was held in Paris on 14–15 May 1991.  相似文献   
907.
We discuss the origin, evolution and fate of low-mass Algols (LMA) that have components with initial masses less than 2.5 M0. The semi-major axes of orbits of pre-LMA do not exceed 20–25 R0. The rate of formation of Algol-type stars is 0.01/year. Magnetic stellar winds may be the factor that determines the evolution of LMA. Most LMA end their lives as double helium degenerate dwarfs with M1/M2 0.88 (like L870-2). Some of them even merge through angular momentum loss caused by gravitational waves.  相似文献   
908.
We present an analysis of seven clusters observed by XMM-Newton as part of our survey of 17 most X-ray luminous clusters of galaxies at z  0.2 selected for a comprehensive and unbiased study of the mass distribution in massive clusters. Using the public software FTOOLS and XMMSAS we have set up an automated pipeline to reduce the EPIC MOS and pn spectro-imaging data, optimized for extended sources analysis. We also developped a code to perform intensive spectral and imaging analysis particularly focussing on proper background estimate and removal. XMM-Newton deep spectro-imaging of these clusters allowed us to fit a standard β-model to their gas emission profiles as well as a standard MEKAL emission model to their extracted spectra, and test their inferred characteristics against already calibrated relations.  相似文献   
909.
GTD Terrain Reflection Model Applied to ILS Glide Scope   总被引:1,自引:0,他引:1  
The capability of calculating the reflection of electromagnetic signals from uneven terrain has many applications. One of these is the determination of instrument landing system (ILS) glide slope performance. For this application the wavelength is approximately 1 m, incidence angles are usually near grazing, and the fields are horizontally polarized, so that gross irregularities such as dropoffs and hills are more important than surface roughness. Past approaches used to calculate the ground reflections for this application have been three-dimensional physical optics models which were very cumbersome and time consuming and which neglected important diffraction and shadowing phenomenon; a two-dimensional physical optics model which was faster than the three-dimensional models but ignored many shadowing and transverse terrain variation effects; and a half-plane diffraction model which is applicable only to a specified type of terrain geometry. In this paper a terrain reflection model based on the geometrical theory of diffraction (GTD) is described which can accommodate any piecewise linear terrain profile, requires less computer time than the physical optics models, is capable of including transverse terrain effects, and determines the reflected fields with all important diffraction and blockage effects included.  相似文献   
910.
Studies of growth of semiconductors and some other materials in microgravity are reviewed over the past 2 or 3 years.  相似文献   
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