全文获取类型
收费全文 | 2417篇 |
免费 | 687篇 |
国内免费 | 283篇 |
专业分类
测绘学 | 22篇 |
大气科学 | 20篇 |
地球物理 | 1429篇 |
地质学 | 1523篇 |
海洋学 | 141篇 |
天文学 | 2篇 |
综合类 | 70篇 |
自然地理 | 180篇 |
出版年
2024年 | 2篇 |
2023年 | 12篇 |
2022年 | 50篇 |
2021年 | 60篇 |
2020年 | 78篇 |
2019年 | 112篇 |
2018年 | 109篇 |
2017年 | 122篇 |
2016年 | 144篇 |
2015年 | 117篇 |
2014年 | 192篇 |
2013年 | 221篇 |
2012年 | 144篇 |
2011年 | 168篇 |
2010年 | 94篇 |
2009年 | 211篇 |
2008年 | 189篇 |
2007年 | 135篇 |
2006年 | 139篇 |
2005年 | 99篇 |
2004年 | 96篇 |
2003年 | 90篇 |
2002年 | 76篇 |
2001年 | 71篇 |
2000年 | 77篇 |
1999年 | 58篇 |
1998年 | 55篇 |
1997年 | 53篇 |
1996年 | 63篇 |
1995年 | 74篇 |
1994年 | 67篇 |
1993年 | 49篇 |
1992年 | 30篇 |
1991年 | 26篇 |
1990年 | 19篇 |
1989年 | 13篇 |
1988年 | 18篇 |
1987年 | 9篇 |
1986年 | 7篇 |
1984年 | 10篇 |
1983年 | 6篇 |
1981年 | 1篇 |
1979年 | 12篇 |
1978年 | 5篇 |
1977年 | 2篇 |
1954年 | 2篇 |
排序方式: 共有3387条查询结果,搜索用时 15 毫秒
41.
This paper presents results of high-resolution deep seismic reflection profiling of the Proterozoic Vindhyan basin of the
Rajasthan area along the Chandli-Bundi-Kota-Kunjer profile. Seismic images have been used to estimate the thickness of Vindhyan
strata as well as to understand the tectonic framework of the basin. The results are constrained by gravity, magnetic and
magnetotelluric data. The study reveals gentle SE-dipping reflection bands representing the Vindhyan strata. The seismic sections
depict gradual thickening of the Vindhyan succession towards southeast from Bundi. The velocities of the upper and lower Vindhyans
are identified as 4.6-4.8 km/s and 5.1-5.3 km/s. The NW limit of the Vindhyan basin is demarcated by the Great Boundary Fault
(GBF) that manifests as a 30 km wide NW dipping thrust fault extending to a depth of 30 km. 相似文献
42.
43.
44.
45.
Dissolved trace elements in river water: spatial distribution and the influencing factor, a study for the Pearl River Delta Economic Zone, China 总被引:1,自引:0,他引:1
T. P. Ouyang Z. Y. Zhu Y. Q. Kuang N. S. Huang J. J. Tan G. Z. Guo L. S. Gu B. Sun 《Environmental Geology》2006,49(5):733-742
Twenty-nine water samples were collected from different river channels of the Pearl River Delta Economic Zone, China. An inductively
coupled plasma-mass spectromonitor (ICP-MS) was used to measure concentrations of the trace elements in these samples. The
results suggest that the average concentrations of rare earth elements in river water show an increasing trend from the West
River, the North River, the rivers of the Pearl River Delta, and the Shenzhen River to the East River. Relatively high concentrations
of heavy metals appear in the East River, the rivers of the Pearl River Delta and the Shenzhen River, while the West River
and the North River have relatively low heavy metal concentrations. Trace element concentrations in samples collected near
urban or industrial areas are much higher than those of samples collected from distant areas, away from urban and industrial
areas. After natural conditions, human activities have significant influence on the trace element concentrations in river
water. This trace element concentration’s spatial distribution in the river water from the Pearl River Delta Economic Zone
is actually an integrated effect of natural conditions and human activity. 相似文献
46.
S-S. Xu A. F. Nieto-Samaniego S. A. Alaniz-Álvarez L. G. Velasquillo-Martínez 《International Journal of Earth Sciences》2006,95(5):841-853
The power-law exponent (n) in the equation: D=cL
n
, with D = maximum displacement and L = fault length, would be affected by deviations of fault trace length. (1) Assuming n=1, numerical simulations on the effect of sampling and linkage on fault length and length–displacement relationship are done in this paper. The results show that: (a) uniform relative deviations, which means all faults within a dataset have the same relative deviation, do not affect the value of n; (b) deviations of the fault length due to unresolved fault tip decrease the values of n and the deviations of n increase with the increasing length deviations; (c) fault linkage and observed dimensions either increase or decrease the value of n depending on the distribution of deviations within a dataset; (d) mixed deviations of the fault lengths are either negative or positive and cause the values of n to either decrease or increase; (e) a dataset combined from two or more datasets with different values of c and orders of magnitude also cause the values of n to deviate. (2) Data including 19 datasets and spanning more than eight orders of fault length magnitudes (10−2–105 m) collected from the published literature indicate that the values of n range from 0.55 to 1.5, the average value being 1.0813, and the peak value of n
d (double regression) is 1.0–1.1. Based on above results from the simulations and published data, we propose that the relationship between the maximum displacement and fault length in a single tectonic environment with uniform mechanical properties is linear, and the value of n deviated from 1 is mainly caused by the sampling and linkage effects. 相似文献
47.
龙门山是青藏高原东缘边界山脉,具有青藏高原地貌、龙门山高山地貌和山前冲积平原三个一级地貌单元。利用数字高程模式图像和裂变径迹年代测定方法研究和计算龙门山晚新生代剥蚀厚度与剥蚀速率,结果表明:3.6 Ma以来龙门山的剥蚀厚度介于1.91-2.16 km之间,剥蚀速率介于0.53-0.60 mm/a之间。在此基础上,开展了该地区岩石圈的弹性挠曲模拟,结果表明龙门山的隆升机制具有以构造缩短隆升和剥蚀卸载隆升相叠合的特点。3.6 Ma之前,龙门山的隆升与逆冲推覆构造负载有关,以构造缩短驱动的构造隆升为特色;3.6 Ma之后,龙门山的隆升与剥蚀卸载驱动的抬升有关,并以剥蚀卸载隆升为特色,进而提出了龙门山晚新生代以来的隆升机制以剥蚀成山作用为主的认识。 相似文献
48.
49.
异常形态、分布严格受推覆断裂控制,范围大、浓集中心明显,浓度变化及因子载荷表明。区内找Ag、Pb有利,而Sb又为其最佳指示元素。 相似文献
50.
滇西水成铀矿勘探综合测井成果 总被引:2,自引:0,他引:2
滇西龙川江盆地发现水成铀矿。本文借助地球物理综合测井技术,对龙川江盆地水成铀矿的成矿规律作有益分析和探讨。重点论述滇西水成铀成矿的成矿(沉积)环境及其成矿物征。 相似文献