全文获取类型
收费全文 | 766篇 |
免费 | 144篇 |
国内免费 | 91篇 |
专业分类
航空 | 516篇 |
航天技术 | 197篇 |
综合类 | 70篇 |
航天 | 218篇 |
出版年
2024年 | 2篇 |
2023年 | 21篇 |
2022年 | 36篇 |
2021年 | 40篇 |
2020年 | 27篇 |
2019年 | 38篇 |
2018年 | 20篇 |
2017年 | 20篇 |
2016年 | 36篇 |
2015年 | 28篇 |
2014年 | 45篇 |
2013年 | 35篇 |
2012年 | 47篇 |
2011年 | 66篇 |
2010年 | 56篇 |
2009年 | 67篇 |
2008年 | 66篇 |
2007年 | 48篇 |
2006年 | 52篇 |
2005年 | 29篇 |
2004年 | 32篇 |
2003年 | 23篇 |
2002年 | 28篇 |
2001年 | 37篇 |
2000年 | 16篇 |
1999年 | 15篇 |
1998年 | 13篇 |
1997年 | 18篇 |
1996年 | 6篇 |
1995年 | 8篇 |
1994年 | 12篇 |
1993年 | 2篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1984年 | 5篇 |
1981年 | 1篇 |
排序方式: 共有1001条查询结果,搜索用时 15 毫秒
991.
992.
993.
994.
《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2023,71(7):3005-3021
Precipitation is an important component of the hydrological and energy cycles, as well as a key input parameter for many applications in the fields of hydrology, climatology, meteorology, and weather forecasting research. As a result, estimating precipitation accurately is critical. The purpose of this research is to conduct a comprehensive and comparative evaluation of grid-based precipitation products over Turkey's Mediterranean region from 2017 to 2021 at monthly and grid scales, using data from 193 ground-based meteorological stations as a reference. PERCIANN CCS, PDIR-Now, GSMaP MVK, PERSIANN CDR, CHIRPS, IMERG v6, GSMaP Gauge, and ERA5 are the eight grid-based precipitation products. Several prospective were used to evaluate the products, including magnitude agreement with gauge stations for the entire region and the six hydrological sub-basins included in the region, performance in capturing various intensity categories, and elevation dependency. According to the evaluation results, PERCIANN CDR, CHIRPS, IMERG v6, GSMaP Gauge, and ERA5 performed well in all evaluation aspects, whereas PERCIANN CCS, PDIR-Now, and GSMaP MVK performed poorly in all metrics. The majority of the products underestimated heavy rainfall events, while all products performed better at low and moderate precipitation events. As a result, the products performed better in the summer and spring months (March to October) than in the winter months (December to February). Furthermore, the results showed that the performance of the majority of the products degraded for elevations greater than 1000 m. The evaluation suggests that PERSIANN CDR, CHIRPS, IMERG v6, GSMaP Gauge, and ERA5 can be used as good precipitation data sources and as a complement to ground-based meteorological stations in Turkey's Mediterranean region. 相似文献
995.
《Advances in Space Research (includes Cospar's Information Bulletin, Space Research Today)》2023,71(1):936-945
Recently, the detection and extraction of geological lineaments have become an essential analytical technique to find relationships between the characteristics and occurrence of hydrogeology, and tectonic studies. The use of remote sensing, with the progressive development of image enhancement techniques, provides an opportunity to produce more reliable and comprehensive lineament maps. In this paper, semi-automatic approach based on Landsat 8 and Sentinel 1 radar data is proposed for lineaments extraction and validation. The combined method of linear filtering and automatic line module ensures a high degree of accuracy resulting in a lineament map. Based on identified lineaments, Sentinel1 is more capable of detecting edges than Landsat8, but the primary orientation lineaments extracted from Landsat8 and Sentinel1 were different. So, by combining band6 of Landsat8, and VV and VH polarization of Sentinel1, the area lineaments were extracted with high accuracy. Rose diagram showed the extracted lineaments' orientation is in good compliance with the region's existing faults. Also, the formations' lineament length density has good consistent with the density of the faults in the geological map. 相似文献
996.
利用激光熔化沉积技术制备15-5PH沉淀硬化不锈钢板,利用金相显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)、电子探针(EPMA)技术,对沉积态组织进行分析,测试沉积态组织的室温拉伸性能。结果表明:激光熔化沉积15-5PH不锈钢沉积态组织由沿沉积增高方向贯穿多层外延生长的柱状晶组成,柱状晶内包含多个细长整齐排列的胞状树枝晶,枝晶内为马氏体组织,枝晶间为铁素体;沉积态组织中弥散分布大量细小的NbC析出相,尺寸12~20 nm;15-5PH不锈钢沉积态组织具有良好的力学性能,纵向抗拉强度和延伸率分别为1 128.5 MPa和14.0%,横向抗拉强度和延伸率分别为1 101 MPa和12.25%。 相似文献
997.
不透水面是评估城市化进程和评价城市环境的重要参考指标,研究城市不透水面的空间覆盖程度对城市生态环境保护、宜居城市建设具有重要意义。本文以“珠海一号”高光谱影像为数据源、珠海市陆域为研究区域,选取支持向量机和随机森林机器学习算法,结合光谱特征,实现城市不透水面信息提取。结果表明:使用“珠海一号”高光谱数据提取不透水面可行性较强,且支持向量机算法更适用于“珠海一号”不透水面提取,总体精度和Kappa系数分别达到92.4%、0.78;基于“珠海一号”高光谱数据进行城市不透水面提取,可为城市规划建设、分析城市土地扩张、评估城市灾害风险提供可靠理论依据和数据支撑。 相似文献
998.
在室内恒温培养条件下,研究了外源Cr3+、Ni2+单一及复合污染对水稻土脲酶、酸性磷酸酶及过氧化氢酶活性的影响.结果表明,低浓度Ni2+处理对脲酶、酸性磷酸酶有不同程度的激活作用,而对过氧化氢酶起一定的抑制作用;中、高浓度Ni2+及各污染水平的Cr3+、Cr-Ni复合污染处理对3种酶活性均表现为抑制作用;Ni2+处理对土壤酶活性的抑制效应顺序为脲酶>酸性磷酸酶>过氧化氢酶;Cr3+和Cr-Ni复合污染处理对脲酶活性的抑制效应最大,对过氧化氢酶、酸性磷酸酶活性的抑制效应相似;Cr-Ni复合污染处理对脲酶、酸性磷酸酶主要表现为协同作用,对过氧化氢酶则主要在污染初期表现为协同作用. 相似文献
999.
1000.