全文获取类型
收费全文 | 3135篇 |
免费 | 636篇 |
国内免费 | 1291篇 |
专业分类
测绘学 | 143篇 |
大气科学 | 115篇 |
地球物理 | 681篇 |
地质学 | 3317篇 |
海洋学 | 222篇 |
天文学 | 16篇 |
综合类 | 355篇 |
自然地理 | 213篇 |
出版年
2024年 | 22篇 |
2023年 | 35篇 |
2022年 | 83篇 |
2021年 | 100篇 |
2020年 | 154篇 |
2019年 | 141篇 |
2018年 | 154篇 |
2017年 | 178篇 |
2016年 | 188篇 |
2015年 | 192篇 |
2014年 | 206篇 |
2013年 | 233篇 |
2012年 | 200篇 |
2011年 | 191篇 |
2010年 | 184篇 |
2009年 | 196篇 |
2008年 | 197篇 |
2007年 | 226篇 |
2006年 | 213篇 |
2005年 | 183篇 |
2004年 | 183篇 |
2003年 | 183篇 |
2002年 | 137篇 |
2001年 | 143篇 |
2000年 | 153篇 |
1999年 | 131篇 |
1998年 | 105篇 |
1997年 | 121篇 |
1996年 | 102篇 |
1995年 | 135篇 |
1994年 | 81篇 |
1993年 | 59篇 |
1992年 | 69篇 |
1991年 | 43篇 |
1990年 | 48篇 |
1989年 | 35篇 |
1988年 | 21篇 |
1987年 | 13篇 |
1986年 | 7篇 |
1985年 | 4篇 |
1984年 | 2篇 |
1983年 | 3篇 |
1982年 | 1篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 3篇 |
1978年 | 2篇 |
排序方式: 共有5062条查询结果,搜索用时 31 毫秒
111.
NEE向阿尔金主断裂带的新构造运动以左旋压扭性活动为特征,仅西端发育张性构造,并可划分出两期变形,新构造运动强度在时间上自上新世晚期开始至第四纪断裂活动强度增大,在空间上自SWW向NEE方向断裂活动强度逐渐减弱;柴达木北缘的新构造运动可划分为两期,其主要构造特征表现为向柴达木盆地逆冲的前进式叠瓦道冲带,柴达木盆地第四纪时的北界相对于第三纪时的北界向南迁移了数十公里;河西走廊盆地的新构造运动主要表现为盆地边缘断裂的逆冲兼走滑,盆地接受新生代沉积、盆地内第三系的轴面南倾的褶皱;NEE向阿尔金主断裂带与其南侧的NWW向断裂带是在统一构造应力场作用下相互协调、同时活动的两组关系紧密的构造带,两者的共同活动构成了断块运动。 相似文献
112.
In the Dharwar tectonic province, the Peninsular Gneiss was considered to mark an event separating the deposition of the older
supracrustal Sargur Group and the younger supracrustal Dharwar Supergroup. Compelling evidence for the evolution of the Peninsular
Gneiss, a polyphase migmatite, spanning over almost a billion years from 3500 Ma to 2500 Ma negates a stratigraphic status
for this complex, so that the decisive argument for separating the older and younger supracrustal groups loses its basis.
Correlatable sequence of superposed folding in all the supracrustal rocks, the Peninsular Gneiss and the banded granulites,
indicate that the gneiss ‘basement’ deformed in a ductile manner along with the cover rocks. An angular unconformity between
the Sargur Group and the Dharwar Super-group, suggested from some areas in recent years, has been shown to be untenable on
the basis of detailed studies, A number of small enclaves distributed throughout the gneissic terrane, with an earlier deformational,
metamorphic and migmatitic history, provide the only clue to the oldest component which has now been extensively reworked. 相似文献
113.
本文对Ni40Mn30Fe30合金与在不同焙烧温度下得到的含水叶蜡,在高温超高压下的反应进行了实验研究,温度测至1420℃,压是至5.5GPa,研究了该反应的物质-化学机制,以及反应速率与温度,压力,含水量等参数的关系,对高压下物质迁移运动的固有特征进行了探讨。 相似文献
114.
新疆阿尔曼太蛇绿岩时代的Nd—Sr同位素地质研究 总被引:15,自引:7,他引:15
本文通过测定采自新疆阿尔曼太兔子泉一带蛇绿岩的堆晶辉长岩、辉绿岩和安山玢岩,获得Sm-Nd等时年龄为561±41Ma,εNd(t)=6.1,Rb-Sr等时年龄为392±17Ma,(87Sr/86Sr)i=0.7041,前者为蛇绿岩的形成时代,后者为蛇绿岩遭受后期变质作用的时间。札河坝-阿尔曼太蛇绿岩的形成环境可能是古亚洲洋向南俯冲引起的弧后盆地 相似文献
115.
116.
Presented in this paper are the newly obtained grain zircon U-Pb ages of volcanic rocks of the Lueliang Goup and associated Kuanping granitic migmatitic gneiss in Shanxi Province.The zircon U-Pb ages of bimodal volcanic rocks(basalt and rhyolite)of the Upper Lueliang Group indicate that the rocks erupted at about 2100 Ma.So the Lueliang Group was formed during the Early Proterozoic.In the area studied the second-stage metamorphism experienced by the Lueliang Group is the dominant one which took place at about 1806 Ma.i.e.,during the late Early Proterozoic. 相似文献
117.
The aridity of the Arabian Peninsula's deserts ranges between arid to hyperarid with hot dry climate, scarce precipitation and sparse vegetation. These harsh environmental conditions enhance some geomorphologic processes more than others, cause specific geotechnical problems, and increase desertification.From west to east, the general physiography of Saudi Arabia shows the Red Sea coastal plains and the escarpment foothills called Tihama followed by the Arabian Shield mountains, the Arabian Shelf plateau and finally the Arabian Gulf coastal plains. Sand moves by wind either as drifting sand or migrating dunes in four major sand seas, over the Arabian Shelf, and in the inter-mountain valleys, in the Arabian Shield causing problems of erosion and deposition. Human activities in the deserts may cause more instability to the sand bodies, enlarging the magnitude of the problem. Fine silty soil particles also move by wind, depositing loess mainly in selected areas downwind in the Tihama. These loess deposits subside and may form earth fissures by the process of hydrocompaction upon wetting. The addition of water can be either natural through storms or man-made through human agricultural or civil activities. Extensive sabkhas exist along the coastal plains of both the Red Sea and Arabian Gulf. The sabkha soil may also heave by salt re-crystallization or collapse by wetting. The shallow groundwater brines present in sabkhas also attack and corrode civil structures. Urbanization and excessive groundwater pumping may also deplete the fresh groundwater resources and may cause subsidence, ground fissuring and surface faulting as observed in some locations in the Arabian Shield. Although the average annual precipitation is very low, rain usually falls in the form of torrential storms, collected by dry valley basins and causing floods to unprotected downstream areas on the coastal plains of the Red Sea.The desert environment, being a fragile echo system, needs to be treated with care. Intercommunications between different national and international agencies and education of the layman should help to keep the system balanced and reduce the resulting environmental hazards. In addition, any suggested remedial measures should be planned with nature and engineered with natural materials. 相似文献
118.
Peter M. Kearl 《Journal of Hydrology》1997,200(1-4):323-344
The colloidal borescope consists of a set of lenses and miniature video cameras capable of observing natural particles in monitoring wells. Based on field observations of these particles, it appears possible to measure in situ groundwater velocity in a well bore. Field observations have shown that directional measurements using the colloidal borescope are generally in good agreement with expected flow directions. However, the magnitude of flow velocity is higher compared with values based on conventional test methods. High relative flow velocities, even after correction factors have been applied to compensate for well bore effects, are believed to be due to preferential flow zones in the surrounding aquifer. Low flow zones exhibit swirling multidirectional flow that does not allow for a linear velocity measurement. Consequently, groundwater flow velocities measured by the colloidal borescope in heterogeneous aquifers will be biased toward the maximum velocity values present in the aquifer. A series of laboratory experiments was conducted to assess the reliability of the instrument. Based on this work, a seepage velocity correction factor (
) of 1–4 was found for quantifying groundwater seepage velocity in the adjacent aquifer from observations in a well bore. Laboratory measurements also indicate that preferential flow in the surrounding aquifer dominates flow in the well. Results of this work suggest the possibility of quantifying higher-flow velocities associated with preferential flow zones in the subsurface. 相似文献
119.
120.
强余震持续时间的早期估计 总被引:2,自引:0,他引:2
本研究旨在解决地震序列中强余震持续时间的早期估计问题。文中首先给出了强余震的震级定义,指出:主震型与强震群型序列的强作震持续时间存在差异。使用模式识别方法对主震型序列中强余震持续时间大于1天,小于1天及无强余震等3种情况进行划分之后,给出了两类序列的强余震持续时间与序列和第一震震级的粗略相关关系。 相似文献