全文获取类型
收费全文 | 3092篇 |
免费 | 545篇 |
国内免费 | 461篇 |
专业分类
航空 | 1890篇 |
航天技术 | 1030篇 |
综合类 | 440篇 |
航天 | 738篇 |
出版年
2024年 | 16篇 |
2023年 | 74篇 |
2022年 | 97篇 |
2021年 | 114篇 |
2020年 | 127篇 |
2019年 | 135篇 |
2018年 | 113篇 |
2017年 | 118篇 |
2016年 | 136篇 |
2015年 | 147篇 |
2014年 | 178篇 |
2013年 | 185篇 |
2012年 | 218篇 |
2011年 | 235篇 |
2010年 | 184篇 |
2009年 | 169篇 |
2008年 | 126篇 |
2007年 | 160篇 |
2006年 | 158篇 |
2005年 | 110篇 |
2004年 | 117篇 |
2003年 | 132篇 |
2002年 | 109篇 |
2001年 | 90篇 |
2000年 | 94篇 |
1999年 | 76篇 |
1998年 | 105篇 |
1997年 | 65篇 |
1996年 | 79篇 |
1995年 | 71篇 |
1994年 | 72篇 |
1993年 | 63篇 |
1992年 | 52篇 |
1991年 | 45篇 |
1990年 | 55篇 |
1989年 | 43篇 |
1988年 | 21篇 |
1987年 | 7篇 |
1986年 | 2篇 |
排序方式: 共有4098条查询结果,搜索用时 15 毫秒
921.
《中国航空学报》2020,33(5):1494-1504
Adapter ring is a commonly used component in non-cooperative satellites, which has high strength and is suitable to be recognized and grasped by the space manipulator. During proximity operations, this circle feature may be occluded by the robot arm or limited field of view. Moreover, the captured images may be underexposed when there is not enough illumination. To address these problems, this paper presents a structured light vision system with three line lasers and a monocular camera. The lasers project lines onto the surface of the satellite, and six break points are formed along both sides of the adapter ring. A closed-form solution for real-time pose estimation is given using these break points. Then, a virtual structured light platform is constructed to simulate synthetic images of the target satellite. Compared with the predefined camera parameters and relative positions, the proposed method is demonstrated to be more effective, especially at a close distance. Besides, a physical space verification system is set up to prove the effectiveness and robustness of our method under different light conditions. Experimental results indicate that it is a practical and effective method for the pose measurement of on-orbit tasks. 相似文献
922.
矢量网络分析仪直接测量两端口网络的微波特性,是射频微波测量领域中应用最广泛的仪器之一。网络分析仪时域技术在故障点定位、多路径消除、不连续性测试等应用中有着非常重要的意义,但是如何合理选取时域模式和设置参数是困扰工程研究人员的难点。本文对网络分析仪时域测量模式、离散数据取样、频率截断、窗函数、归一化等时域测量理论进行详细介绍,给出了时域测量范围和分辨力的计算方法,并以开路器的时域响应为例,说明了时域测量相关参数的设置依据。 相似文献
923.
Caroline Andrade Enner Alcântara Nariane Bernardo Milton Kampel 《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2019,63(7):2175-2188
Monitoring chlorophyll-a (Chl-a) concentrations in inland waters is crucial for water quality management, since Chl-a is a proxy for phytoplankton biomass and, thus, for ecological health of a water environment. Chl-a concentration can be retrieved through the inherent optical properties (IOPs) of a water system, which, in turn, can be remotely sensed obtained. Quasi-analytical algorithm (QAA), originally developed for ocean waters, can also retrieve IOPs for inland waters after re-parameterizations. This study is aimed at assessing the performance of sixteen schemes composed by QAA original and re-parameterized versions followed by models that use absorption coefficients as inputs for estimating Chl-a concentration in Ibitinga reservoir, located at Tietê River cascading system, São Paulo State, Brazil. It was verified that only QAAV5 based schemes were able to obtain reasonable estimates for image data and that by four models tested presented similar and acceptable results for QAAV5 outputs. The best model were applied to a Ocean and Land Colour Instrument (OLCI) image. Light absorption in the reservoir showed to be dominated by colored dissolved organic matter (CDOM), and wide spatial and temporal variability of optical and water quality properties was observed. 相似文献
924.
通过对中小型守时实验室对时间尺度稳定度的需求分析,以目前主流守时钟5071A为例,利用国际权度局公布的原子钟数据,研究不同钟组配置与时间尺度稳定度的关系,为中小时间实验室守时钟组的优化配置提供参考依据;权重确定是原子时算法的关键之一,通过对不同数量、不同取权规则的原子时计算结果进行统计分析与比较,提出中小时间实验室原子时尺度算法中的取权原则。 相似文献
925.
通过对扭矩量值传递中有关器具工作原理及工作时受力的分析,指出了用扭矩扳子检定装置检定扭矩扳子时检定结果难以一致的原因,给出了解决办法,并进行了验证。 相似文献
926.
CBMU是A330飞机电源系统中一个关键组件,负责监控电子、机械多个章节系统的跳开关状态。对于CBMU数据库软件构型的管理,通常是根据具体的硬件改装工作,由相关专业系统工程师自行控制。该方式容易导致CBMU数据库软件构型变更管理失控,严重时会影响到飞行安全。本文旨在分析梳理传统管理模式的基础上,结合实际经验,探讨构建一种新的管理模式,以达到有效管理CBMU数据库软件构型的目的。 相似文献
927.
928.
929.
在发动机活动试车台上,对全尺寸的从环形过渡到腰果形的发动机排气量,进行了热态的出口压力和温度分布测试,实验结果表明,排气管出口截面的上部存在有严重的低压区,出现气流倒流的现象,产生的原因是由于发动机排气管的上壁面的扩张角过大造成的,排气管出口夫面温度由上向下不断提高,上部因受冷气倒流的影响,温度只有90℃左右,而对应排气管环形部分直接排出燃气,由于未受冷空气的掺混,使出口截面下半的气流最调达度42 相似文献
930.
A data-driven health indicator extraction method for aircraft air conditioning system health monitoring 总被引:2,自引:0,他引:2
Prognostics and Health Management (PHM) has become a very important tool in modern commercial aircraft. Considering limited built-in sensing devices on the legacy aircraft model, one of the challenges for airborne system health monitoring is to find an appropriate health indicator that is highly related to the actual degradation state of the system. This paper proposed a novel health indicator extraction method based on the available sensor parameters for the health monitoring of Air Conditioning System (ACS) of a legacy commercial aircraft model. Firstly, a specific Airplane Condition Monitoring System (ACMS) report for ACS health monitoring is defined. Then a non-parametric modeling technique is adopted to calculate the health indicator based on the raw ACMS report data. The proposed method is validated on a single-aisle commercial aircraft widely used for short and medium-haul routes, using more than 6000 ACMS reports collected from a fleet of aircraft during one year. The case study result shows that the proposed health indicator can effectively characterize the degradation state of the ACS, which can provide valuable information for proactive maintenance plan in advance. 相似文献