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111.
Mark A. Skinner Ray W. Russell Tom Kelecy Steve Gregory Richard J. Rudy Daryl L. Kim Kirk Crawford 《Acta Astronautica》2014
There exists a population of defunct satellites in the geo-stationary arc that potentially pose a hazard to current and future operational satellites. These drifting, non-station-kept objects have a variety of ages and sizes, and many are trapped in libration orbits around the Earth?s two gravitational potential wells (the non-spherical nature of the Earth gives rise to two geo-potential wells or “stable points” that affect objects in geostationary and geosynchronous orbits), whereas others were boosted to higher altitudes into so-called “graveyard” orbits. 相似文献
112.
The James Webb Space Telescope (JWST) 总被引:1,自引:0,他引:1
Mark Clampin 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,41(12):1983-1991
The James Webb Space Telescope is a 6.5 m, infrared space telescope designed to be launched in 2013 aboard an Ariane 5. The JWST program is a cooperative program with the Goddard Space Flight Center (GSFC) managing the project for NASA. The prime contractor for JWST is Northrop Grumman Space Technology (NGST). JWST’s international partners are the European Space Agency (ESA) and the Canadian Space Agency (CSA). JWST will address four major science themes: end of the dark ages: first light and reionization; the assembly of galaxies, the birth of stars and protoplanetary systems; and the formation of planetary systems and the origins of life. We discuss the design of the observatory and review recent progress on the JWST program. 相似文献
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The Lunar Reconnaissance Orbiter Laser Ranging Investigation 总被引:1,自引:0,他引:1
Maria T. Zuber David E. Smith Ronald S. Zellar Gregory A. Neumann Xiaoli Sun Richard B. Katz Igor Kleyner Adam Matuszeski Jan F. McGarry Melanie N. Ott Luis A. Ramos-Izquierdo David D. Rowlands Mark H. Torrence Thomas W. Zagwodzki 《Space Science Reviews》2010,150(1-4):63-80
The objective of the Lunar Reconnaissance Orbiter (LRO) Laser Ranging (LR) system is to collect precise measurements of range that allow the spacecraft to achieve its requirement for precision orbit determination. The LR will make one-way range measurements via laser pulse time-of-flight from Earth to LRO, and will determine the position of the spacecraft at a sub-meter level with respect to ground stations on Earth and the center of mass of the Moon. Ranging will occur whenever LRO is visible in the line of sight from participating Earth ground tracking stations. The LR consists of two primary components, a flight system and ground system. The flight system consists of a small receiver telescope mounted on the LRO high-gain antenna that captures the uplinked laser signal, and a fiber optic cable that routes the signal to the Lunar Orbiter Laser Altimeter (LOLA) instrument on LRO. The LOLA instrument receiver records the time of the laser signal based on an ultrastable crystal oscillator, and provides the information to the onboard LRO data system for storage and/or transmittal to the ground through the spacecraft radio frequency link. The LR ground system consists of a network of satellite laser ranging stations, a data reception and distribution facility, and the LOLA Science Operations Center. LR measurements will enable the determination of a three-dimensional geodetic grid for the Moon based on the precise seleno-location of ground spots from LOLA. 相似文献
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