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   101篇
  免费   0篇
航空   32篇
航天技术   58篇
航天   11篇
  2021年   2篇
  2019年   1篇
  2017年   1篇
  2016年   1篇
  2014年   3篇
  2013年   4篇
  2012年   5篇
  2011年   3篇
  2010年   3篇
  2009年   4篇
  2008年   17篇
  2007年   7篇
  2006年   3篇
  2005年   5篇
  2004年   2篇
  2003年   6篇
  2002年   1篇
  2001年   6篇
  2000年   1篇
  1999年   1篇
  1998年   2篇
  1997年   1篇
  1996年   1篇
  1994年   3篇
  1993年   3篇
  1992年   3篇
  1991年   1篇
  1990年   2篇
  1989年   1篇
  1987年   1篇
  1986年   1篇
  1985年   2篇
  1983年   1篇
  1982年   1篇
  1981年   1篇
  1969年   1篇
排序方式: 共有101条查询结果,搜索用时 15 毫秒
21.
When an LLC-type parallel resonant converter (LLC-PRC) operates above resonant frequency, the switching transistors can be turned off at zero voltage. Further study reveals that the LLC-PRC possesses the advantage of lower converter voltage gain as compared with the conventional PRC. Based on the analytic results derived, a complete set of design curves from which a systematic design procedure is developed is obtained. Experimental results from a 150-W, 150-kHz, multioutput LLC-type PRC power supply are presented  相似文献   
22.
This article examines the international legal and diplomatic questions relating to arms control and disarmament, focusing on space-based activities. These relate importantly to the development of anti-satellite satellites (ASATs) and ballistic missile defence systems (BMDs). Part I of the article examines the goal of ‘peaceful uses’ of outer space as elaborated in national policies and in international fora, the debate that has has taken place at the international level over the meaning and definition of peaceful purposes, legal manoeuvres, particularly in the UN, and US responses, and recent Soviet initiatives relating to space militarization. Part II will appear in the next issue, and will consider the US Presidential-Congressional dialogue on these questions and recent Presidential initiatives.  相似文献   
23.
This article continues a detailed examination of the international legal and diplomatic questions relating to arms control and disarmament, focusing on space-based activities. These are importantly concerned with the development of anti-satellite (ASAT) systems and ballistic missile defence (BMD). This part of the article considers the US Presidential-Congressional dialogue - particularly the ASAT testing issue - and Presidential initiatives vis-à-vis the USSR. An epilogue to the original paper considers the diplomatic moves and policy shifts which contributed to the January 1985 US-Soviet meeting and the agreement to begin bilateral negotiations to consider space and nuclear arms.  相似文献   
24.
Temporal and Spatial Variation of the Ion Composition in the Ring Current   总被引:3,自引:0,他引:3  
A global view of the ring current ions is presented using data acquired by the instrument MICS onboard the CRRES satellite during solar maximum. The variations of differential intensities, energy spectra, radial profile of the energetic particles and the origin of the magnetic local time (MLT) asymmetry of the ring current have been investigated in detail. O+ ions are an important contributor to the storm time ring current. Its abundance in terms of number density increases with increasing geomagnetic activity as well as its energy density. However, a saturation value for the energy density of O+ ions has been found. The low-energy H+ ions show a dramatic intensification and a rapid decay. However, its density ratio during the storm maximum is almost constant. On the other hand, high-energy H+ ions first exhibit a flux decrease followed by a delayed increase. Its density ratio shows an anti-correlation with the storm intensity. Both the positions of the maximum flux of O+ and He+ depend on storm activity: they move to lower altitudes in the early stage of a storm and move back to higher L-values during the recovery phase. Whereas the position of H+ and He++ show almost no dependence on the Dst index. The energy density distributions in radial distance and magnetic local time show drastic differences for different ion species. It demonstrates that the ring current asymmetry mainly comes from oxygen and helium ions, but not from protons. The outward motion of O+ around local noon may have some implications for oxygen bursts in the magnetosheath during IMF Bz negative conditions as observed by GEOTAIL.  相似文献   
25.
Utilizing ACE satellite observations from 1998 to 2009, we performed the elaborate study on the properties of the clock angle θCA (arctan(By/Bz) (?90° to 90°) of the interplanetary magnetic field (IMF) in the solar wind at 1?AU. The solar wind with northward IMF (NW-IMF) and southward IMF (SW-IMF) are analyzed, independently. Statistical analysis shows that the solar wind with SW-IMF and NW-IMF has similar properties in general, including their durations, the IMF Bz and By components, and the IMF θCA. Then, the solar wind with NW-IMF (SW-IMF) is classified into five different temporal scales according to the duration of the NW-IMF (SW-IMF), i.e., very-short wind of 10–30?min, short-scale wind of 0.5–1?h, moderate-scale wind of 1–3?h, long-scale wind of 3–5?h, and super-long wind >5?h. Our analysis reveals that the IMF θCA has a distinct decrease with increase of the temporal scale of the solar wind. Next, the solar wind is classified into two groups, i.e., the high-speed solar wind (>450?km/s) and the low-speed solar wind (<450?km/s). Our analysis indicates that the IMF θCA depends highly on the solar wind speed. Statistically, high-speed solar wind tends to have larger IMF θCA than low-speed solar wind. The evolutions of the solar wind and IMF with the solar activity are further studied, revealing no clear solar variation of the IMF θCA. Finally, we analyze the monthly variation of the IMF θCA. Superposed epoch result strongly suggests the seasonal variation of the IMF θCA.  相似文献   
26.
This report is an edited version of a talk given by Professor Christol at the Conference on Law and Life in Space, held at the Center for Aerospace Sciences, University of North Dakota, Grand Forks, ND, in September 1986. Professor Christol reviews the principles of space law as they relate to the relations between states, through existing treaties and agreements. He offers a hope that, through ‘strategic stability’, conditions will emerge for further agreements, and for public international outer space law to become more rigorous.  相似文献   
27.
The evolution of coronal mass ejection/shock system is investigated by numerically solving the usual set of two-dimensional single-fluid polytropic magnetohydrodynamic equations from 1 Rs to 1 AU in the meridian plane. The simulation result reveals that the coronal mass ejection/shock system formed near the sun evolves into the magnetic cloud/shock system near the earth’s orbit through the following three phases: the initial formation, the dominant latitudinal expansion and the similar expansion.  相似文献   
28.
Solar radio burst, especially the fine structures (FSs) and the drifting pulsation structures (DPSs), may be used as an important diagnostics tool to draw the evolution map of the flare loop in the initial phase of solar flares. In this work, 52 radio events were found accompanying with DPSs. They were all observed with the Solar Radio Spectrometers (0.625–7.6 GHz) of China during 1998–2004. Combining the radio observations with LASCO-C2, Goes-8 SXR, Hα, EUV and Trace observations, we analyzed all these events and obtained some statistic conclusions: First, 88% DPSs take place at the initial phase of the radio burst, and their rich spectrum characteristics are helpful to understand the events further. Second, 83% DPSs are associated with CMEs or ejection events, and all the events are accompanied by Goes SXR flare. Third, for CMEs and DPSs, which take the first step, there is no significant predominance of either of them. The relationship between the DPSs and CMEs is still not clear in this study because of the lack of spatial resolution in the centimeter–decimeter band. However, the EIT or Trace ejection happened during the onset/end time of DPSs. They are signatures of the initial phase of CMEs. Two events will be illustrated to explain this.  相似文献   
29.
30.
Current distribution control for parallel connected converters. II   总被引:1,自引:0,他引:1  
For pt.I, see ibid., vol.28, no.3, p.829-840 (1992). In the central-limit control (CLC), the multiloop controls are employed to regulate the output voltage and track the central weighted current, thus equalizing the output current of each converter module (CM). The current distribution error (CDE) between the output current of each CM is used as a criterion in judging system performance. The prediction and simulation results of this control scheme are illustrated. When incorporated with the maximum current limit, the proposed control method can determine the number of required converters in the active state for each load condition. As a result, the efficiency of a system can be increased significantly. A comparison between the performances of the system under master-slave control (MSC) and CLC is given  相似文献   
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