全文获取类型
收费全文 | 3282篇 |
免费 | 545篇 |
国内免费 | 686篇 |
专业分类
测绘学 | 133篇 |
大气科学 | 672篇 |
地球物理 | 729篇 |
地质学 | 1769篇 |
海洋学 | 393篇 |
天文学 | 165篇 |
综合类 | 332篇 |
自然地理 | 320篇 |
出版年
2024年 | 13篇 |
2023年 | 50篇 |
2022年 | 156篇 |
2021年 | 163篇 |
2020年 | 112篇 |
2019年 | 121篇 |
2018年 | 164篇 |
2017年 | 158篇 |
2016年 | 177篇 |
2015年 | 149篇 |
2014年 | 197篇 |
2013年 | 178篇 |
2012年 | 166篇 |
2011年 | 179篇 |
2010年 | 200篇 |
2009年 | 189篇 |
2008年 | 164篇 |
2007年 | 145篇 |
2006年 | 102篇 |
2005年 | 92篇 |
2004年 | 56篇 |
2003年 | 86篇 |
2002年 | 78篇 |
2001年 | 92篇 |
2000年 | 105篇 |
1999年 | 155篇 |
1998年 | 115篇 |
1997年 | 139篇 |
1996年 | 129篇 |
1995年 | 112篇 |
1994年 | 103篇 |
1993年 | 84篇 |
1992年 | 75篇 |
1991年 | 60篇 |
1990年 | 51篇 |
1989年 | 44篇 |
1988年 | 40篇 |
1987年 | 13篇 |
1986年 | 25篇 |
1985年 | 15篇 |
1984年 | 11篇 |
1983年 | 16篇 |
1982年 | 8篇 |
1981年 | 10篇 |
1980年 | 6篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1975年 | 2篇 |
1969年 | 1篇 |
1958年 | 1篇 |
排序方式: 共有4513条查询结果,搜索用时 15 毫秒
71.
大型维歇特地震仪自德国引进南京地震台已近70年。本文简要叙述了该仪器的性能;并以南京地震台的大型维歇特地震仪的记录为例,介绍了该仪器在300-2000km范围内的记录特征,回顾了该仪器在地震速报中所起的历史作用。 相似文献
72.
Sedimentary successions and internal structure of the coastal barrier-lagoon system of Boao, eastern Hainan Island were studied through utilizing data from test holes and trenches and ground-penetrating-radar (GPR) profiles. During late Pleistocene, fluvial and delta plains developed over an unevenly eroded bedrock during low sea level stand, followed by the formation of littoral and lagoon facies and defined coastal barrier-lagoon-estuary system during the post-glacial uppermost Pleistocene-lower Holocene eustatic rise of the sea level, and the upper Holocene high stand. GPR results show that Yudaitan, a sandy coastal bar backed by a low-laying land (shoal) just east of the active lagoon, is a continuous, parallel and slightly-wavy reflectors indicating homogeneous sandy or sandy gravel sediments, and inclined reflectors partly caused by progradation and accumulation of beach sand and gravel. Quasi-continuous, hummocky and chaotic reflectors from the shoal of Nangang village correspond to mixed accumula 相似文献
73.
74.
吉林延边开山屯地区蓝片岩相变质作用——来自硬绿泥石+纤锰柱石+多硅白云母组合的证据 总被引:5,自引:4,他引:5
吉林延边开山屯低级变质作用发育于兴凯地块西南晚古生代活动大陆边缘,这里产出二叠纪末的消减增生杂岩。低级变质作用矿物除冻蓝闪石、阳起石、玉髓、黝帘石、多硅白云母、绿泥石、钠长石外,还在灰黑色变泥质岩中发现硬绿泥石 纤锰柱石 多硅白云母组合。这是国内首次报道的以泥质岩为原岩并具有硬绿泥石 纤锰柱石标志矿物组合的蓝片岩相岩石。研究表明,该组合的形成温度290.14(或370.8)℃,具明显的低温特征。 相似文献
75.
The Jiaocbang arcuate structure is one of the numerous arcuate structural belts in Sichuan. The present paper gives a further argument about the characteristics of that arcuate structure and the new activity of the Songpinggou fault and affirms that the Songpinggou fault is an active fault in the Holocene epoch. The Diexi M7.5 earthquake took place in 1933 on the west wing of that arcuate structure, near the apex of the arc. Many authors have given quite different opinions about the genetic structure of that earthquake. The authors have made on-the-spot investigations time and again over recent years. Besides this, the authors have also further studied the shape of intensity contour lines, the distribution characteristics of ground surface seismic hazards, the left-lateral dislocation of buildings along the Songpinggou fault, the NWtrending ground fissures that developed on the ground surface after earthquake, and so on. On this basis, it is still considered that the seismogenic fault of the 1933 Diexi M7.5 earthquake was the Songpinggou fault on the west wing of the Jiaochang arcuate structure. 相似文献
76.
77.
Shifeng Dai Xiaoqiang Hou Deyi Ren Yuegang Tang 《International Journal of Coal Geology》2003,55(2-4):139-150
The chemical composition of pyrite in coal can be used to investigate its geological and mineralogical origin. In this paper, high-resolution time-of-flight secondary ion mass spectrometry (TOF-SIMS) was used to study the chemical composition of various pyrite forms in the No. 9 coal seam (St,d=3.46%) from the Wuda Coalfield, Inner Mongolia, northern China. These include bacteriogenic, framboidal, massive, cell-filling, fracture-filling, and nodular pyrites. In addition to Fe+ (54Fe+, 56Fe+, 57Fe+), other fragment ions were detected in bacteriogenic pyrites, such as 27Al+, Si+ (28Si+, 29Si+, 30Si+), 40Ca+, Cu+ (63Cu+, 65Cu+), Zn+ (64Zn+, 66Zn+, 67Zn+, 68Zn+), Ni+ (58Ni+, 60Ni+, 62Ni+), and C3H7+. TOF-SIMS images show bacteriogenic pyrites are relatively rich in Cu, Zn, and Ni, suggesting that bacteria probably play an important role in the enrichment of Cu, Zn, and Ni during their formation. Intense positive secondary ion fragments from framboidal aggregates, such as 27Al+, 28Si+, 29Si+, AlO+, CH2+, C3H3+, C3H5+, and C4H7+, indicate that formation of the framboidal aggregates may have occurred together with clay mineral and organic matter, which probably serve as the binding substance. The intense ions of 28Si+ and 27Al+ from massive pyrites also suggest that their pores incorporated clay minerals during crystallization. Together with the lowest 28Si+/23Na+ value, the intense organic positive secondary ion peaks from cell-filling pyrites, such as C3H3+, C3H5+, C3H7+, and C4H7+, indicate that pyrite formation may have accompanied dissolution or disintegration of the cell. The intense P+ peak was observed only in the fracture-filling pyrite and the highest 28Si+/23Na+ value of fracture-filling pyrite reflects its epigenetic origin. Together with XRD and REEs data, the stronger 40Ca+ in nodular pyrite than other pyrite forms shows seawater influence during its formation. 相似文献
78.
ZhangBingshan TangLiangjie JinZhijun DaiJunsheng ZhangMingli ZhangBingshan 《中国地质大学学报(英文版)》2003,14(1):65-72
The purpose of this paper is to analyze the regional fault systems of Qaidam basin and ad-jacent orogenic belts. Field investigation and seismic interpretation indicate that five regional fault sys-tans occurred in the Qaidam and adjacent nment.qin belts, controlling the development and evolution of the Qaidam basin. These fault systems are: (1)north Qaidam-Qilian Mountain fault system; (2) south Qaidam-East Kunhm Mountain fault system;(3)Altun strike-slip fault system; (4) Elashan strike-slip fault system, and (5) Gansen-Xiaochaidan fault system. It is indicated that the fault systems controlled the orientation of the Qaidam basin, the formation and distribution of secondary faults within the basin,the migration of depocenters and the distribution of hydrocarbon accmnulation belt. 相似文献
79.
2002年南海季风建立及其雨带变化的天气学研究 总被引:12,自引:1,他引:12
利用南海海 气通量观测试验资料结合NCEP ,GPCP以及GMS - 5云图资料 ,综合分析了 2 0 0 2年 5~ 6月南海西南季风建立过程及其雨带变化 ,确定 5月 14日西沙及北部海区西南季风爆发 ,5月 15日整个南海季风爆发 ,季风爆发时间属于正常年 ;季风爆发时风向、风速、云量、降水、湿度、辐射及海面温度等要素都发生突变。这种突变是由大气环流的突变造成的。季风爆发前后大气环流变化过程是 :80~ 90°E越赤道气流加强 ,同时印缅低压加深 ,孟加拉湾南北向气压梯度增大 ,而后东亚大陆上气旋发展东移 ,副热带高压东撤 ,孟加拉湾低压槽前的赤道西风突然加强越过中南半岛 ,南海北部首先出现强西南风 ,继而南海季风迅速地全面爆发。孟加拉湾西南风加强到南海季风爆发是一个连续的过程 ,大陆冷空气南下起了重要的作用。南海季风爆发时呈现单雨带型 ,而后由单雨带型转变为双雨带型 ,雨带受副热带高压和季风系统共同影响 ,并且随着副热带高压移动位置变化。 相似文献
80.
四川地区强震发生条件的综合分析 总被引:2,自引:0,他引:2
根据发震断层的时代,发震构造的应力和几何结构条件,对四川地区的强震发生条件进行了综合分析,结果表明,四川地区孕育和发生强震的断层主要晚更新世以来,特别是全新世以来活动的断裂;强震多发生在主压力方向与断层交角成30°~60°之间的最危险滑动角值范围,走滑断层的斜列状结构,断裂的交叉结构,断裂的枢纽结构,断裂上的弯曲,转折部位以及断裂带上的横向隆起,拗陷及其交接部位都是发震构造的结构特征,有利于强震的 相似文献