全文获取类型
收费全文 | 263篇 |
免费 | 122篇 |
国内免费 | 42篇 |
专业分类
航空 | 357篇 |
航天技术 | 16篇 |
综合类 | 34篇 |
航天 | 20篇 |
出版年
2023年 | 5篇 |
2022年 | 16篇 |
2021年 | 41篇 |
2020年 | 12篇 |
2019年 | 9篇 |
2018年 | 12篇 |
2017年 | 8篇 |
2016年 | 20篇 |
2015年 | 14篇 |
2014年 | 17篇 |
2013年 | 19篇 |
2012年 | 25篇 |
2011年 | 37篇 |
2010年 | 26篇 |
2009年 | 39篇 |
2008年 | 19篇 |
2007年 | 26篇 |
2006年 | 19篇 |
2005年 | 24篇 |
2004年 | 10篇 |
2003年 | 8篇 |
2002年 | 4篇 |
2001年 | 5篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1997年 | 2篇 |
1996年 | 4篇 |
1995年 | 2篇 |
1993年 | 1篇 |
1992年 | 1篇 |
排序方式: 共有427条查询结果,搜索用时 265 毫秒
171.
采用经验数据和数值计算相结合的方法研究亚声飞行Ma数变化对带气动阀的脉冲爆震发动机(Pulsedetonation engine,简称PDE)的性能影响。分别计算了飞行Ma数在0.52,0.71,0.82和0.93时对PDE工作频率、推力和油耗的影响。计算表明当飞行Ma数从0.82增加到0.93时,频率上升11.1%,推力上升25.0%,油耗下降6.2%;而Ma数从0.82减小到0.52时,频率下降31.0%,推力下降43.6%,油耗增加14.8%。因此飞行Ma数变化对预估飞行器在亚声阶段的加速性能有较大的参考价值。 相似文献
172.
173.
174.
A new vortex sheet model was proposed for simulating aircraft wake vortex evolution.Rather than beginning with a pair of counter-rotating cylindrical vortices as in the traditional models,a lift-drag method is used to initialize a vortex sheet so that the roll-up phase is taken into account.The results of this model report a better approximation to a real situation when compared to the measurement data.The roll-up induced structures are proved to influence the far-field decay.On one hand,they lead to an early decay in the diffusion phase.On the other hand,the growth of linear instability such as elliptical instability is suppressed,resulting in a slower decay in the rapid decay phase.This work provides a simple and practicable model for simulating wake vortex evolu tion,which combines the roll-up process and the far-field phase in simulation.It is also proved that the roll-up phase should not be ignored when simulating the far-field evolution of an aircraft wake vortex pair,which indicates the necessity of this new model. 相似文献
175.
S. Benck M. Cyamukungu J. Cabrera 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2008,42(9):1538-1549
The topic of relativistic electron dynamics in the outer radiation belt has received considerable attention for many years. Nevertheless, the problem of understanding the physical phenomenon involved is far from being resolved. In this paper, we use DEMETER observations to examine the variations of the energetic electron fluxes and ELF/VLF wave intensities in the inner magnetosphere during the intense 8 November 2004 magnetic storm. Electron flux spectra and associated wave intensity spectra are analysed throughout the magnetic storm and common characteristics or differences to other storm events are retained. The overall objective of this study is to identify and derive parameters that are relevant for particle flux modelling; the time constant characterizing the persistent decay after particle enhancement was found to be one of these important model parameters.The analysis of the 8 November 2004 event reveals that for L-shell parameter higher than 4, an electron flux dropout is observed during the storm’s main phase for electrons in the energy range 0.1–1 MeV, as has been reported from other measurements. Characteristic wave spectra accompanying this phase are analysed. They show a typical enhancement in the frequency range 0.3–10 kHz at onset for all L-shell values under consideration (2 < L < 5). During the first stage of the recovery phase, the electron fluxes are increased to a level higher than the pre-storm level, whereas the level of wave intensity in the frequency range observed below 300 Hz is at its highest. In the second stage, the particle flux decrease goes hand in hand with a global wave activity decline, the relaxation time of the latter being smaller than the former’s one. In some other cases, long-lasting electron enhancement associated with constant wave activity has been observed during this latter stage. For the above mentioned storm, while at low L values the decay time constants are higher for low energy electrons than for high energy electrons, this order is reversed at high L values. At about L = 3.6 the time constant is independent of electron energy. 相似文献
176.
预混气爆震波在不同直径管间的传播特性 总被引:1,自引:0,他引:1
在管径20mm与60mm的两管间研究了预混气爆震波的传播特性,着重测量了爆震波传递过程中的压力与速度变化,并分析了预混气压力、浓度、当量比以及连接段尺寸等参数对爆震波传播的影响与规律。研究发现:小管中没有爆震时大管中仍然可以出现爆震波,小张角的连接段对爆震波的再触发有利,再触发后的爆震波其压力、速度受到预混气压力、浓度及当量比等参数的影响。 相似文献
177.
178.
圆环片扰流器对爆震燃烧特性的影响 总被引:1,自引:0,他引:1
在飞行状态下成功实行液态燃料的连续爆震在工程上有较大的难度。通过在爆震管内安装扰流器促进爆震波的形成,并针对不同扰流器结构参数对管内爆震燃烧压力和火焰传播速度的影响开展了实验研究,获得了爆震燃烧特性随扰流器长度、间距和起始位置的变化规律。结果表明:燃烧波峰值压力和火焰传播速度随扰流器片数、间距的增加和起始位置的变大而增大;当在管内产生爆震波后(爆震波峰值压力大于1.4M Pa,火焰传播速度>1 000 m/s),燃烧波压力和火焰传播速度随上述参数的改变变化不大。 相似文献
179.
180.