首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   303篇
  免费   12篇
  国内免费   9篇
航空   156篇
航天技术   103篇
综合类   9篇
航天   56篇
  2021年   4篇
  2019年   5篇
  2018年   6篇
  2016年   4篇
  2014年   14篇
  2013年   9篇
  2012年   14篇
  2011年   23篇
  2010年   12篇
  2009年   14篇
  2008年   18篇
  2007年   6篇
  2006年   6篇
  2005年   5篇
  2004年   5篇
  2003年   12篇
  2002年   19篇
  2001年   17篇
  2000年   6篇
  1999年   11篇
  1998年   3篇
  1997年   3篇
  1996年   3篇
  1995年   5篇
  1994年   5篇
  1993年   3篇
  1992年   4篇
  1989年   2篇
  1988年   3篇
  1987年   3篇
  1986年   2篇
  1985年   4篇
  1984年   6篇
  1983年   5篇
  1982年   5篇
  1981年   9篇
  1980年   2篇
  1979年   2篇
  1978年   4篇
  1977年   3篇
  1976年   3篇
  1975年   3篇
  1974年   2篇
  1973年   2篇
  1971年   3篇
  1970年   4篇
  1969年   4篇
  1968年   2篇
  1967年   3篇
  1965年   2篇
排序方式: 共有324条查询结果,搜索用时 15 毫秒
281.
Between 25 and 30 years ago, the IECEC Proceedings carried a series of papers by the present authors and other members of a JPL team on the problems and the desirable design features associated with the MHW RTGs to be used to power JPL's Voyager I and II spacecraft. The Voyager I and II spacecraft successfully completed their original 12 year missions 10 years ago and are at distances of over 55 AU and 70 AU from the sun. The power systems worked almost precisely as predicted. The Voyager spacecraft seem to have several decades of life left to make measurements outside the solar system. This paper gives a technical overview of the design process and problems  相似文献   
282.
Advanced spectral and statistical data analysis techniques have greatly contributed to shaping our understanding of microphysical processes in plasmas. We review some of the main techniques that allow for characterising fluctuation phenomena in geospace and in laboratory plasma observations. Special emphasis is given to the commonalities between different disciplines, which have witnessed the development of similar tools, often with differing terminologies. The review is phrased in terms of few important concepts: self-similarity, deviation from self-similarity (i.e. intermittency and coherent structures), wave-turbulence, and anomalous transport.  相似文献   
283.
稀土对硼铝共渗扩散机制的影响   总被引:4,自引:0,他引:4  
建立了硼原子和铝原子的扩散模型 ,讨论了稀土对硼原子和铝原子扩散机制的影响。分析认为 :硼原子的扩散速度受 Fe2 B前沿硼原子向基体扩散速度的影响 ,也受硼原子通过 Fe2 B晶胞向基体扩散速度的控制 ;铝原子是在硼化物覆盖表面之前渗入的 ,当硼化物完全覆盖表面后 ,阻碍了铝原子的扩散 ,故铝在渗层次表面形成了化合物 ;稀土的渗入增加了空位数 ,使空位复合体的数量增加 ,也就加速了硼原子的扩散速度 ,增加了铝原子的渗入量  相似文献   
284.
Four types of optimal solutions are demonstrated to exist for transfers (time of flight is not fixed) between close near-circular coplanar orbits. One solution is realized with the help of fixed orientation of the propulsion system (PS) along a transversal in the orbital coordinate system. Another is reached at fixed orientation of the PS in the inertial coordinate system. The third and fourth types of solutions change the PS orientation in the process of executing the maneuver. Regions of existence are established for all types of solutions, and algorithms for determination of parameters of these maneuvers are suggested. The algorithms were used to calculate parameters of the maneuvers of transfer from a launching orbit to a working Sun-synchronous orbit, and to calculate the maneuvers of supporting the parameters of such an orbit in a specified range.  相似文献   
285.
We analyze the complete set of in-situ meteorological data obtained from the Viking landers in the 1970s to today’s Curiosity rover to review our understanding of the modern near-surface climate of Mars, with focus on the dust, CO2 and H2O cycles and their impact on the radiative and thermodynamic conditions near the surface. In particular, we provide values of the highest confidence possible for atmospheric opacity, atmospheric pressure, near-surface air temperature, ground temperature, near-surface wind speed and direction, and near-surface air relative humidity and water vapor content. Then, we study the diurnal, seasonal and interannual variability of these quantities over a span of more than twenty Martian years. Finally, we propose measurements to improve our understanding of the Martian dust and H2O cycles, and discuss the potential for liquid water formation under Mars’ present day conditions and its implications for future Mars missions. Understanding the modern Martian climate is important to determine if Mars could have the conditions to support life and to prepare for future human exploration.  相似文献   
286.
287.
A biometric identification system, based on the processing of the human iris by the dyadic wavelet transform, has been introduced. The procedure to obtain an iris signature of 256 bits has been described, as well as the feature extraction block and the verification system. The results have shown that the system can achieve high rates of security.  相似文献   
288.
The galactic cosmic rays arriving near Earth, which include both stable and long-lived nuclides from throughout the periodic table, consist of a mix of stellar nucleosynthesis products accelerated by shocks in the interstellar medium (ISM) and fragmentation products made by high-energy collisions during propagation through the ISM. Through the study of the composition and spectra of a variety of elements and isotopes in this diverse sample, models have been developed for the origin, acceleration, and transport of galactic cosmic rays. We present an overview of the current understanding of these topics emphasizing the insights that have been gained through investigations in the charge and energy ranges Z≲30 and E/M≲1 GeV/nuc, and particularly those using data obtained from the Cosmic Ray Isotope Spectrometer on NASA’s Advanced Composition Explorer mission.  相似文献   
289.
We will summarize in this paper the effects that the presence of the magnetic field can cause to proto-stellar jet dynamics, structure and emission line properties, and the differences between two- and three-dimensional numerical simulations will be emphasized. This revised version was published online in August 2006 with corrections to the Cover Date.  相似文献   
290.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号