全文获取类型
收费全文 | 95271篇 |
免费 | 1048篇 |
国内免费 | 1391篇 |
专业分类
测绘学 | 2991篇 |
大气科学 | 6066篇 |
地球物理 | 18681篇 |
地质学 | 37048篇 |
海洋学 | 7418篇 |
天文学 | 18943篇 |
综合类 | 2315篇 |
自然地理 | 4248篇 |
出版年
2022年 | 602篇 |
2021年 | 919篇 |
2020年 | 1018篇 |
2019年 | 1080篇 |
2018年 | 6813篇 |
2017年 | 5940篇 |
2016年 | 4835篇 |
2015年 | 1342篇 |
2014年 | 2291篇 |
2013年 | 3766篇 |
2012年 | 3412篇 |
2011年 | 5688篇 |
2010年 | 4793篇 |
2009年 | 5777篇 |
2008年 | 4925篇 |
2007年 | 5498篇 |
2006年 | 3039篇 |
2005年 | 2146篇 |
2004年 | 2272篇 |
2003年 | 2184篇 |
2002年 | 1954篇 |
2001年 | 1656篇 |
2000年 | 1495篇 |
1999年 | 1158篇 |
1998年 | 1217篇 |
1997年 | 1190篇 |
1996年 | 967篇 |
1995年 | 985篇 |
1994年 | 889篇 |
1993年 | 769篇 |
1992年 | 732篇 |
1991年 | 740篇 |
1990年 | 838篇 |
1989年 | 721篇 |
1988年 | 661篇 |
1987年 | 793篇 |
1986年 | 636篇 |
1985年 | 861篇 |
1984年 | 939篇 |
1983年 | 884篇 |
1982年 | 805篇 |
1981年 | 827篇 |
1980年 | 724篇 |
1979年 | 643篇 |
1978年 | 679篇 |
1977年 | 600篇 |
1976年 | 568篇 |
1975年 | 571篇 |
1974年 | 540篇 |
1973年 | 606篇 |
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
851.
852.
Parson Lindsay Sauter Daniel Mendel Véronique Patriat Philippe Searle Roger 《Marine Geophysical Researches》1997,19(6):535-552
Geophysical data from 900 km of the Southwest Indian Ridge are used todescribe the pattern of evolution of the plate boundary between 61° Eand 70° E over the past 20 million years. The SWIR is anobliquely-opening, ultra slow-spreading axis, and east of61° E comprises a series of ridge sections, each about 100–120 kmin length. The orientation of these sections varies fromsub-orthogonal to oblique to the approximately N–S spreadingdirection. In general, the suborthogonal sections are shallower, commonlysubdivided into an array of discrete axial segments, and carry recognisablecentral magnetic anomalies. The majority of the oblique sections are single,continuous rifts without continuous axial magnetic signatures.Morphotectonics of the Southwest Indian Ridge crust have not previously beenwell constrained off-axis, and we here present sidescan sonar andswath bathymetric data up to 100 km from the ridge to demonstrate the complexities of its spatial and temporal evolution.A model is proposed that the segmentation style correlates with analong-axis variation between: (a) relatively thick crustal sections which overlie mantle sections with higher magmatic supply created in orthogonally-spreading segments and (b) those oblique sections associated with cooler, magmatically-starved mantle and thinner crust. These latter sections are formed at broad offset zones in theplate boundary, more precisely defined on faster-spreading ridges asnontransform discontinuities. The nonsystematic pattern of crustalconstruction, extensional basin formation and the absence of extension-parallel traces of discontinuities off-axis suggest that the oblique spreading sections are not fixed in space or time. 相似文献
853.
Controls on organic carbon distribution in sediments from the eastern Arabian Sea Margin 总被引:2,自引:0,他引:2
Sediment cores from the upper continental slope of the eastern Arabian Sea have high organic carbon (OC), CaCO3, and sand content at the top. The values decrease with increasing depth in the Holocene and Upper Pleistocene. Topographic
highs show highest OC and lower CaCO3 in the Holocene clayey sediments and vice versa in the Pleistocene sandy sediments. The OC is immature and marine or a mixture
of both marine and terrestrial in the Holocene sediments and is mostly terrestrial and/or reworked marine in the Pleistocene
sediments. Productivity is the main controlling factor for the organic carbon enrichment. Texture and reworking also influence
the organic carbon variations.
Received: 29 May 1996/Revision received: 10 January 1997 相似文献
854.
855.
856.
Laurence P. Madin Stephen M. Bollens Erich Horgan Mari Butler Jeffrey Runge Barbara K. Sullivan Grace Klein-Macphee Edward Durbin Ann G. Durbin Donna Van Keuren Stphane Plourde Ann Bucklin M. Elizabeth Clarke 《Deep Sea Research Part II: Topical Studies in Oceanography》1996,43(7-8)
Hydroids are typically attached, benthic cnidarians that feed on a variety of small prey. During sampling on Georges Bank in spring 1994, we found huge numbers of hydroids suspended in the plankton. They fed on young stages of copepods that are an important prey for fish, as well as on young fish themselves. Two independent methods were used to estimate feeding rates of the hydroids; both indicate that the hydroids are capable of consuming from 50% to over 100% of the daily production of young copepods. These results suggest that hydroids can have a profound effect on the population dynamics of zooplankton and young fish on Georges Bank. 相似文献
857.
Michael G. Simpson 《Marine environmental research》1992,34(1-4)
As part of a joint workshop organised by the International Council for the Exploration of the Sea (ICES) and the Intergovernmental Oceanographic Commission (IOC) on biological effects monitoring techniques. dad (Limanda limanda) were examined from six spaced stations along a 200 km transect extending from near the mouth of the Elbe River out to the Dogger Bank in the North Sea. Based on historical data, differences in contaminant concentrations in sediments exist along the transect (lipophilic organic xenobiotics at the inshore sites and heavy metals offshore over the Dogger Bank). The most contaminated site sampled was the most inshore, the least contaminated was approximately midway along the transect, with contamination building up again over the farthest point along the transect, over the Dogger Bank. Multiple organs and tissues were examined for full pathology from each fish sampled. Only liver data are presented here (11–20 livers per station). The most significant lesions were considered to be well-developed foci of cellular alteration, high mitotic activity and high neutral lipid accumulation in livers from dab sampled from the most inshore site examined. Livers from the least-contaminated station showed minimal evidence of such changes. Foci of cellular alteration and neutral lipid accumulation were also seen in dab liver sampled from fish from the Dogger Bank site. Thus far, the hepatic changes seen correlate well with the most contaminated sites along the transect. The value of comprehensively examining the histopathology of an organ of toxicological significance, such as the liver in a European species of flatfish, is demonstrated. 相似文献
858.
Domenico Voltolina Leslie N. Brown Maurice G. Robinson 《Estuarine, Coastal and Shelf Science》1985,21(6):817-822
The results of eight sets of repeated observations on the vertical variations of the chlorophyll maximum layer in a shallow lagoon during a red tide show that these were more frequently hydrologically induced, rather than due to active vertical migrations of the red tide-forming organism. These results are discussed and compared to those existing in the literature, with special regard to the role of light and nitrogen in conditioning vertical migrations in red tide-forming dinoflagellates. 相似文献
859.
860.
We study the problem of reconstruction (interpolation and extrapolation) of the vertical profiles of hydrochemical and hydrobiological elements according to incomplete sets of data with simultaneous filtration of short-period components based on expansions in empirical orthogonal functions. The genetic algorithm is used to compute the coefficients of expansion of profiles with missing data. We present the results of processing the data arrays on oxygen, chlorophyll A, and biogenic elements collected in the Black Sea in 1982–1993. The mean error of reconstruction of the profiles enables us to conclude that the proposed method has considerable advantages over the conventional approaches. 相似文献