全文获取类型
收费全文 | 1151篇 |
免费 | 165篇 |
国内免费 | 172篇 |
专业分类
测绘学 | 247篇 |
大气科学 | 64篇 |
地球物理 | 264篇 |
地质学 | 437篇 |
海洋学 | 173篇 |
天文学 | 18篇 |
综合类 | 44篇 |
自然地理 | 241篇 |
出版年
2024年 | 2篇 |
2023年 | 7篇 |
2022年 | 16篇 |
2021年 | 27篇 |
2020年 | 38篇 |
2019年 | 61篇 |
2018年 | 30篇 |
2017年 | 50篇 |
2016年 | 45篇 |
2015年 | 45篇 |
2014年 | 47篇 |
2013年 | 56篇 |
2012年 | 48篇 |
2011年 | 49篇 |
2010年 | 62篇 |
2009年 | 67篇 |
2008年 | 70篇 |
2007年 | 89篇 |
2006年 | 84篇 |
2005年 | 45篇 |
2004年 | 77篇 |
2003年 | 65篇 |
2002年 | 41篇 |
2001年 | 36篇 |
2000年 | 33篇 |
1999年 | 37篇 |
1998年 | 28篇 |
1997年 | 27篇 |
1996年 | 30篇 |
1995年 | 21篇 |
1994年 | 26篇 |
1993年 | 23篇 |
1992年 | 21篇 |
1991年 | 20篇 |
1990年 | 16篇 |
1989年 | 12篇 |
1988年 | 10篇 |
1987年 | 13篇 |
1986年 | 8篇 |
1985年 | 2篇 |
1979年 | 2篇 |
1977年 | 1篇 |
1954年 | 1篇 |
排序方式: 共有1488条查询结果,搜索用时 15 毫秒
631.
《水文科学杂志》2013,58(2)
Abstract The assessment of the spatial and temporal distribution of water resources in Mediterranean region is crucial for the better management of available resources. In Lebanon in particular, the snow is a crucial parameter for water supply. However, few research works were performed until now to study this potential resource because of difficulties inherent to the measurement of the water volume stored by snow. Remote sensing, and more specifically radar imaging, is the favourite tool for investigating the now water equivalent. This study aims to assess the potential of synthetic aperture radar (SAR) imaging for estimating the snow water equivalent in relation with eight experimental sites distributed over the high plateaus of the Lebanese mountains. With this purpose, an algorithm was tested, which links the backscattering coefficient to physical parameters of the snow and underlying soil, and which allows to assess the water equivalent from the backscattering ratios of a winter scene and a reference scene taken during a period with no snow. To this end, four RADARSAT images were acquired during winter 2001, concurrently to field observations. The model was developed in Quebec for regions with low relief, whereas relief has a decisive influence on the radar signal and on the geometry of images, in a context of high mountains. Consequently, radiometric and geometric corrections were compulsory in order to reduce distortions dues to topographical effects. The preliminary results corroborate the existence of a series of limitations to the application of the algorithm to the particular conditions of the Lebanese snow cover: heterogeneity, accelerated metamorphism and high content of liquid water. 相似文献
632.
This study concerns the identification of parameters of soil constitutive models from geotechnical measurements by inverse analysis. To deal with the non‐uniqueness of the solution, the inverse analysis is based on a genetic algorithm (GA) optimization process. For a given uncertainty on the measurements, the GA identifies a set of solutions. A statistical method based on a principal component analysis (PCA) is, then, proposed to evaluate the representativeness of this set. It is shown that this representativeness is controlled by the GA population size for which an optimal value can be defined. The PCA also gives a first‐order approximation of the solution set of the inverse problem as an ellipsoid. These developments are first made on a synthetic excavation problem and on a pressuremeter test. Some experimental applications are, then, studied in a companion paper, to show the reliability of the method. Copyright © 2009 John Wiley & Sons, Ltd. 相似文献
633.
634.
QU Chunyan SHAN Xinjian LIU Yunhu ZHANG Guohong SONG Xiaogang ZHANG Guifang GUO Liming HAN Yufei 《《地质学报》英文版》2012,86(2):510-519
The 12 May 2008 Wenchuan Ms8.0 earthquake produced surface displacements along the causative fault, the Yingxiu–Beichuan Fault, which are up to several meters near the fault. Because of the large gradient, satellite synthetic aperture radar (SAR) interferometric data are strongly incoherent; the usual SAR interferometry method does not allow such displacements to be measured. In the present study, we employed another approach, the technique based on pixel offset tracking, to solve this problem. The used image data of six tracks are from the Advanced Land Observing Satellite, Phased Array type L-band Synthetic Aperture Radar (ALOS/ PALSAR) dataset of Japan. The results show that the entire surface rupture belt is 238 km long, extending almost linearly in a direction of 42° north–east. It is offset left laterally by a north–west-striking fault at Xiaoyudong, and turns at Gaochuan, where the rupture belt shifts toward the south by 5 km, largely keeping the original trend. In terms of the features of the rupture traces, the rupture belt can be divided into five sections and three types. Among them, the Beichuan–Chaping and Hongkou–Yingxiu sections are relatively complex, with large widths and variable traces along the trend. The Pingtong–Nanba and Qingping–Jingtang sections appear uniform, characterized by straight traces and small widths. West of Yingxiu, the rupture traces are not clear. North of the rupture belt, surface displacements are 2.95 m on average, mostly 2–3.5 m, with 7–9 m the maximum near Beichuan. South of the rupture belt, the average displacement is 1.75 m, dominated by 1–2 m, with 3–4 m at a few sites. In the north, the displacements in the radar line of sight are of subsidence, and in the south, they are uplifted, in accordance with a right-slip motion that moves the northern wall of the fault to the east, and the southern wall to the west, respectively. Along the Guanxian–Jiangyou Fault, there is a uplift zone in the radar line of sight, which is 66 km long, 1.5–6 km wide, and has vertical displacements of approximately 2 m, but no observable rupture traces. 相似文献
635.
636.
国家黄金钻石制品质量监督检验中心收到待检的百余件群镶钻石首饰中发现混有大量HPHT合成黄色钻石.采用宝石显微镜、红外光谱仪、X射线荧光光谱仪、紫外可见光分光光谱仪、紫外荧光灯、DiamondView^TM等对HPHT合成钻石样品做了详细地测试与分析.结果表明,这些HPHT合成钻石样品具有较为统一的黄色,放大检查可见合成钻石内部含有大量棒状、柱状、细小微粒状的铁镍合金包裹体,且几乎都有磁性,有些磁性甚至较强;样品的红外反射光谱非常特征,均具有明显的1 131 cm^-1处的吸收峰,为Ⅰb型钻石,而Ⅰb型钻石在天然钻石中极少见到;X射线荧光光谱测试显示有强烈的铁峰和镍峰,且在短波紫外线下多数具有绿黄色荧光.HPHT合成钻石在DiamondView^TM下具有不同程度的黄绿色荧光,部分具有黑十字现象. 相似文献
637.
638.
639.
在详细调查研究区内地质灾害现状的情况下,对采煤引起的覆岩破坏、地表变形等进行了预测,并采用模糊综合评判二次评价模型对地质灾害危险性进行了综合预测。结果表明,研究区地质灾害现状不发育,但井下采矿工程对地面建筑物的危险性大,易引发崩塌、地裂缝、地面塌陷等灾害;预测地质灾害危险大区分布于井田北部、东部和南部,危险性中等区则位于井田中部。预测结果对于矿井的安全生产具有一定的指导意义。 相似文献
640.
本文介绍了一种新的星载合成孔径雷达干涉测量数据处理技术(GeoWatch InSAR技术),具有下述特点和优势:1.对城市和郊区农村全面连续覆盖,不仅包括建筑物,而且包括路面、广场、飞机跑道等其他地物和半植被覆盖的自然地区;2.合成处理多景/多波段/多模式/多极化/多轨道/多卫星平台的数据,从而缩短观测时间,提高精度和覆盖;3.所有结果为真正射投影图像,支持各种比例尺和范围的面状连续监测;4.支持ERS-1&2、ENVISAT、ALOS PALSAR、JERS-1、RADARSAT-1&2、TerraSAR、COSMO-SkyMed(CSK)和将来中国的HJ1小雷达卫星群。用此技术处理了天津地区的ENVISAT数据,得到了范围(抽样间隔)分别为100km×100km(50m×50m)、天津市(20m×20m)、廊坊市(15m×15m)及胜芳镇(7m×7m)的全面连续的地面沉降率图像,显示了它在地面沉降监测中的独特优势和应用前景。 相似文献