全文获取类型
收费全文 | 10780篇 |
免费 | 311篇 |
国内免费 | 395篇 |
专业分类
测绘学 | 282篇 |
大气科学 | 991篇 |
地球物理 | 2374篇 |
地质学 | 3816篇 |
海洋学 | 1253篇 |
天文学 | 2125篇 |
综合类 | 73篇 |
自然地理 | 572篇 |
出版年
2023年 | 54篇 |
2022年 | 74篇 |
2021年 | 100篇 |
2020年 | 113篇 |
2019年 | 144篇 |
2018年 | 365篇 |
2017年 | 310篇 |
2016年 | 410篇 |
2015年 | 247篇 |
2014年 | 425篇 |
2013年 | 620篇 |
2012年 | 371篇 |
2011年 | 595篇 |
2010年 | 467篇 |
2009年 | 640篇 |
2008年 | 511篇 |
2007年 | 489篇 |
2006年 | 472篇 |
2005年 | 425篇 |
2004年 | 384篇 |
2003年 | 360篇 |
2002年 | 339篇 |
2001年 | 290篇 |
2000年 | 277篇 |
1999年 | 227篇 |
1998年 | 212篇 |
1997年 | 196篇 |
1996年 | 175篇 |
1995年 | 166篇 |
1994年 | 132篇 |
1993年 | 108篇 |
1992年 | 96篇 |
1991年 | 102篇 |
1990年 | 94篇 |
1989年 | 94篇 |
1988年 | 72篇 |
1987年 | 124篇 |
1986年 | 79篇 |
1985年 | 79篇 |
1984年 | 96篇 |
1983年 | 101篇 |
1982年 | 94篇 |
1981年 | 84篇 |
1980年 | 77篇 |
1979年 | 63篇 |
1977年 | 63篇 |
1976年 | 52篇 |
1975年 | 50篇 |
1974年 | 40篇 |
1973年 | 48篇 |
排序方式: 共有10000条查询结果,搜索用时 109 毫秒
761.
The stable isotopes of oxygen and hydrogen were used to determine the seasonal contributions of precipitation to groundwater
recharge at a forested catchment area in the upper North Han River basin, Korea. A comparison of the stable isotopic signatures
of groundwater and precipitation indicates that the precipitations which occurred during both the dry and rainy seasons are
the important source of groundwater recharge in this region. A stable isotopic signature shown in the stream waters at the
upstream reaches is similar to that of groundwaters, indicating that stream waters are mostly fed by groundwater discharge.
Reservoir waters in the downstream flood control dams have lower deuterium excess values or d-values compared with those of the upstream waters, indicating a secondary evaporative enrichment. These results can provide
a basis for the effective management of groundwater and stream water resources in the North Han River basin. 相似文献
762.
Sonja Aulbach William L. Griffin Norman J. Pearson Suzanne Y. O’Reilly Buddy J. Doyle 《Contributions to Mineralogy and Petrology》2007,154(4):409-427
Major-element compositions of minerals in peridotite xenoliths from the Lac de Gras kimberlites provide constraints on the
mode of lithosphere formation beneath the central Slave Craton, Canada. Magnesia contents of reconstructed whole rocks correlate
positively with NiO and negatively with CaO contents, consistent with variable partial melt extraction. Alumina and Cr2O3 contents are broadly positively correlated, suggestive of melt depletion in the absence of a Cr–Al phase. Garnet modes are
high at a given Al2O3 content (a proxy for melt depletion), falling about a 7 GPa melt depletion model. These observations, combined with high
olivine Mg# and major-element relationships of FeO-poor peridotites (<7.5 wt%) indicative of melt loss at pressures >3 GPa
(residual FeO content being a sensitive indicator of melt extraction pressure), and similar high pressures of last equilibration
(∼4.2 to 5.8 GPa), provide multiple lines of evidence that the mantle beneath the central Slave Craton has originated as a
residue from high-pressure melting, possibly during plume subcretion. Apparent low melt depletion pressures for high-FeO peridotites
(>7.5 wt%) could suggest formation in an oceanic setting, followed by subduction to their depth of entrainment. However, these
rocks, which are characterised by low SiO2 contents (<43 wt%), are more likely to be the result of post-melting FeO-addition, leading to spuriously low estimates of
melt extraction pressures. They may have reacted with a silica-undersaturated melt that dissolved orthopyroxene, or experienced
olivine injection by crystallising melts. A secular FeO-enrichment of parts of the deep mantle lithosphere is supported by
lower average Mg# in xenolithic olivine (91.7) compared to olivine inclusions in diamond (92.6). 相似文献
763.
764.
A geochemical baseline provides the means to distinguish between the pedogenic origin and the anthropogenic origin of the
trace element in the environmental compartments. We collected 271 soil samples representative of different parent rocks and
soil types from the whole territory of Hong Kong and analyzed the composition of clay mineralogy and the contents of 15 chemical
elements (Fe, Cd, As, etc.) for these samples. The baseline was predicted with the method of the normalization procedure combined
with the relative cumulative frequency curve. The result indicated that Fe was the best reference element for the normalization
procedure among the five potential reference elements (Fe, Al, Sc, Ti, and Mn), followed by Sc and Ti. A poor correlation
was found between Sc, Ti, and Cu. The predicted baseline was much lower than the A-value of the Dutch List used usually in screening the polluted soil of Hong Kong, implying that the extent of heavy metal
pollution might have been underestimated with respect to local lands. We also applied the cluster analysis to distinguish
the geochemical associations of the trace elements due to its importance to the baseline. Approximately three major associations
including the Fe–Mn-oxides related, Al oxides or Al-bearing-clay-mineralogy related and sulfide- related associations were
observed from the dendrogram. 相似文献
765.
Effect of agricultural land use on the chemistry of groundwater from basaltic aquifers, Jeju Island, South Korea 总被引:2,自引:0,他引:2
Dong-Chan Koh Kyung-Seok Ko Yongje Kim Seung-Gu Lee Ho-Wan Chang 《Hydrogeology Journal》2007,15(4):727-743
Geochemical processes were identified as controlling factors of groundwater chemistry, including chemical weathering, salinization from seawater and dry sea-salt deposition, nitrate contamination, and rainfall recharge. These geochemical processes were identified using principal component analysis of major element chemistry of groundwater from basaltic aquifers in Jeju Island, South Korea, a volcanic island with intense agricultural activities. The contribution of the geochemical processes to groundwater chemistry was quantified by a simple mass-balance approach. The geochemical effects due to seawater were considered based on Cl contributions, whereas the effects due to natural chemical weathering were based on alkalinity. Nitrogenous fertilizers, and especially the associated nitrification processes, appear to significantly affect groundwater chemistry. A strong correlation was observed between Na, Mg, Ca, SO4 and Cl, and nitrate concentrations in groundwater. Correspondingly, the total major cations, Cl, and SO4 in groundwater were assessed to estimate relative effect of N-fertilizer use on groundwater chemistry. Cl originates more from nitrate sources than from seawater, whereas SO4 originates mostly from rainwater. N-fertilizer use has shown the greatest effect on groundwater chemistry, particularly when nitrate concentrations exceed 6–7 mg/L NO3–N. Nitrate contamination significantly affects groundwater quality and 18% of groundwater samples have contamination-dominated chemistry. 相似文献
766.
Ian Knowles Michael Teubner Aimin Yan Paul Rasser Jong Wook Lee 《Hydrogeology Journal》2007,15(6):1107-1118
A new inverse technique for modelling groundwater flow, based on a functional minimization technique, has been used to calibrate
a groundwater flow model of a subregion of the Port Willunga aquifer within the Willunga Basin in South Australia. The Willunga
Basin is the location of extensive viticulture, irrigated primarily by groundwater, the levels and quality of which have declined
significantly over the last 40 years. The new method is able to generate estimates of transmissivity, storativity and groundwater
recharge over the whole subregion as a time-varying continuous surface; previous methods estimate local discrete parameter
values at specific times. The new method has also been shown to produce accurate head values for the subregion and very good
estimates of groundwater recharge. Its ultimate goal will be to provide a new and invaluable tool for significantly improved
groundwater resource management.
Supported in part by US National Science Foundation grants, DMS-0107492 and DMS-0079478. 相似文献
767.
768.
769.
P. A. Bedrosian N. Maercklin U. Weckmann Y. Bartov T. Ryberg O. Ritter 《Geophysical Journal International》2007,170(2):737-748
Magnetotelluric and seismic methods provide complementary information about the resistivity and velocity structure of the subsurface on similar scales and resolutions. No global relation, however, exists between these parameters, and correlations are often valid for only a limited target area. Independently derived inverse models from these methods can be combined using a classification approach to map geologic structure. The method employed is based solely on the statistical correlation of physical properties in a joint parameter space and is independent of theoretical or empirical relations linking electrical and seismic parameters. Regions of high correlation (classes) between resistivity and velocity can in turn be mapped back and re-examined in depth section. The spatial distribution of these classes, and the boundaries between them, provide structural information not evident in the individual models. This method is applied to a 10 km long profile crossing the Dead Sea Transform in Jordan. Several prominent classes are identified with specific lithologies in accordance with local geology. An abrupt change in lithology across the fault, together with vertical uplift of the basement suggest the fault is sub-vertical within the upper crust. 相似文献
770.