全文获取类型
收费全文 | 4676篇 |
免费 | 513篇 |
国内免费 | 902篇 |
专业分类
测绘学 | 127篇 |
大气科学 | 303篇 |
地球物理 | 878篇 |
地质学 | 2239篇 |
海洋学 | 592篇 |
天文学 | 1290篇 |
综合类 | 135篇 |
自然地理 | 527篇 |
出版年
2024年 | 34篇 |
2023年 | 61篇 |
2022年 | 126篇 |
2021年 | 136篇 |
2020年 | 187篇 |
2019年 | 192篇 |
2018年 | 144篇 |
2017年 | 163篇 |
2016年 | 146篇 |
2015年 | 202篇 |
2014年 | 224篇 |
2013年 | 259篇 |
2012年 | 225篇 |
2011年 | 225篇 |
2010年 | 199篇 |
2009年 | 347篇 |
2008年 | 340篇 |
2007年 | 388篇 |
2006年 | 347篇 |
2005年 | 269篇 |
2004年 | 246篇 |
2003年 | 234篇 |
2002年 | 205篇 |
2001年 | 161篇 |
2000年 | 183篇 |
1999年 | 165篇 |
1998年 | 162篇 |
1997年 | 78篇 |
1996年 | 82篇 |
1995年 | 74篇 |
1994年 | 53篇 |
1993年 | 44篇 |
1992年 | 32篇 |
1991年 | 23篇 |
1990年 | 36篇 |
1989年 | 21篇 |
1988年 | 19篇 |
1987年 | 14篇 |
1986年 | 11篇 |
1985年 | 6篇 |
1984年 | 8篇 |
1983年 | 7篇 |
1982年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
1979年 | 2篇 |
1978年 | 3篇 |
1977年 | 1篇 |
1973年 | 1篇 |
1954年 | 2篇 |
排序方式: 共有6091条查询结果,搜索用时 15 毫秒
991.
农牧交错带典型区农业与牧业用地互动关系研究 总被引:13,自引:0,他引:13
利用1989年和2000年的两期Landsat-TM数据和相关的统计资料以及气候数据,应用转移距阵和多元回归分析等研究方法,对地处典型农牧交错带地区的兴和县土地利用变化进行研究,结果表明:农田和草地是研究区域中最主要的土地利用类型,Landsat-TM卫星影像数据和统计数据比较一致地反映农田和草地面积的变化;农田和草地的相互转换率在各种用地相互转化中非常剧烈;农业与牧业用地的互动特征具有明显的区域差异;农业和牧业用地的互动特点是自然因素和社会经济因素同时影响的结果。 相似文献
992.
993.
The Upper Miocene Cerro Morado Andesites constitutes a mafic volcanic field (100 km2) composed of andesite to basaltic andesite rocks that crop out 75 km to the east from the current arc, in the northern Puna of Argentina. The volcanic field comprises lavas and scoria cones resulting from three different eruptive phases developed without long interruptions between each other. Lavas and pyroclastic rocks are thought to be sourced from the same vents, located where orogen-parallel north-south faults crosscut transverse structures.The first eruptive phase involved the effusion of extensive andesitic flows, and minor Hawaiian-style fountaining which formed subordinate clastogenic lavas. The second phase represents the eruption of slightly less evolved andesite lavas and pyroclastic deposits, only distributed to the north and central sectors of the volcanic field. The third phase represents the discharge of basaltic andesite magmas which occurred as both pyroclastic eruptions and lava effusion from scattered vents distributed throughout the entire volcanic field. The interpreted facies model for scoria cones fits well with products of typical Strombolian-type activity, with minor fountaining episodes to the final stages of eruptions.Petrographic and chemical features suggest that the andesitic units (SiO2 > 57%) evolved by crystal fractionation. In contrast, characteristics of basaltic andesite rocks are inconsistent with residence in upper-crustal chambers, suggesting that batches of magmas with different origins or evolutive histories arrived at the surface and erupted coevally.Based on the eruptive styles and lack of volcanic quiescence gaps between eruptions, the Cerro Morado Andesites can be classified as a mafic volcanic field constructed from the concurrent activity of several small, probably short-lived, monogenetic centers. 相似文献
994.
通过镇江市邮电通信指挥中心大楼深基坑工程的设计与施工,全面介绍了组合钢支撑在深基坑支护工程应用中的设计、施工方法及支撑效果.实践证明,组合钢支撑是一种施工方法简单、施工速度快、对周边环境影响小、安全可靠的支撑形式,具有较强的市场竞争能力及良好的推广应用前景. 相似文献
995.
Christian Creixell Miguel ngel Parada Pierrick Roperch Diego Morata Csar Arriagada Carlos Prez de Arce 《Tectonophysics》2006,425(1-4):101-122
The Concón Mafic Dike Swarm (CMDS) consists of basaltic to andesitic dikes emplaced into deformed Late Paleozoic granitoids during the development of the Jurassic arc of central Chile. The dikes are divided into an early group of thick dikes (5–12 m) and a late group of thin dikes (0.5–3 m). Two new amphibole 40Ar/39Ar dates obtained from undeformed and deformed dikes, constrain the age of emplacement and deformation of the CMDS between 163 and 157 Ma. Based on radiometric ages, field observations, AMS studies and petrographic data, we conclude that the emplacement of the CMDS was syntectonic with the Jurassic arc extension and associated with sinistral displacements along the NW-trending structures that host the CMDS. The common occurrence of already deformed and rotated xenoliths in the dikes indicates that deformation in the granitoids started previously.The early thick dikes and country rocks appear to have been remagnetized during the exhumation of deep-seated coastal rocks in the Early Cretaceous (around 100 Ma). The remanent magnetization in late thin dikes is mainly retained by small amounts of low-Ti magnetite at high temperature and pyrrhotite at low temperature. The magnetization in these dikes appears to be primary in origin. Paleomagnetic results from the thin dikes also indicate that the whole area was tilted 23° to the NNW during cooling of the CMDS.The NNW–SSE extension vectors deduced from the paleomagnetic data and internal fabric of dikes are different with respect to extension direction deduced for the Middle–Late Jurassic of northern Chile, pointing to major heterogeneities along the margin of the overriding plate during the Mesozoic or differences in the mechanisms driving extension during such period. 相似文献
996.
G. Günay 《Environmental Geology》2006,51(2):229-240
The Sakarya River is one of the largest rivers in Turkey and is fed mainly from Sakaryabaşı springs. The Sakaryabaşı springs are located in the Central Anatolia and issue from confined/semi-confined karst having a thermal component and therefore, having quite different hydrogeological characteristics as compared to the Taurus Karst region, a typical example of the Mediterranean type of karst. The karstic carbonate rocks that form the groundwater reservoir are overlain by a thick semi-pervious overburden of mainly clastics of Neogene age. Tectonics is the major factor controlling the occurrence of the karst springs in the area where topography is rather flat. This study aimed at explaining the occurrence and movement of the karst groundwater within the system by use of hydrogeological, chemical, and isotopic tools. Isotopic composition of the waters revealed that all waters in the region are of meteoric origin and the thermal component is due to deep circulation. The catchment area of the hydrogeological system extends to the south and groundwater movement is towards the outlets, which are in a depression along a major fault. The movement of the groundwater, based on analysis of remotely sensed images, is controlled mainly by structural elements. 相似文献
997.
998.
内蒙古敖脑达坝斑岩型铜银锡多金属矿床围岩蚀变特征研究 总被引:1,自引:0,他引:1
在给出明确的命名原则基础上,将矿床的蚀变围岩划分为五类:黄玉石英交代岩、绿泥石石英交代岩、绢云母石英交代岩、电气石绿泥石化花岗斑岩、钾长石化花岗斑岩。在平面上岩体中心部位为黄玉石英蚀变带,其两侧为绿泥石石英蚀变带;在剖面上由上向下依次出现绿泥石石英蚀变带→黄玉石英蚀变带→绢英岩化带→钾化带→(电气石)绿泥石化带。从蚀变岩石地球化学角度阐述了铜银锡各自不同的成矿部位。 相似文献
999.
Consider the problem of generating a realization y1 of a Gaussian random field on a dense grid of points 1 conditioned on field observations y2 collected on a sparse grid of points 2. An approach to this is to generate first an unconditional realization y over the grid =1 2, and then to produce y1 by conditioning y on the data y2. As standard methods for generating y, such as the turning bands, spectral or Cholesky approaches can have various limitations, it has been proposed by M. W. Davis to generate realizations from a matrix polynomial approximations to the square root of the covariance matrix. In this paper we describe how to generate a direct approximation to the conditional realization y1, on 1 using a variant of Davis' approach based on approximation by Chebyshev polynomials. The resulting algorithm is simple to implement, numerically stable, and bounds on the approximation error are readily available. Furthermore we show that the conditional realization y1 can be generated directly with a lower order polynomial than the unconditional realization y, and that further reductions can be achieved by exploiting a nugget effect if one is present. A pseudocode version of the algorithm is provided that can be implemented using the fast Fourier transform if the field is stationary and the grid 1 is rectangular. Finally, numerical illustrations are given of the algorithm's performance in generating various 2-D realizations of conditional processes on large sampling grids. 相似文献
1000.