全文获取类型
收费全文 | 6682篇 |
免费 | 844篇 |
国内免费 | 1579篇 |
专业分类
测绘学 | 970篇 |
大气科学 | 1111篇 |
地球物理 | 1322篇 |
地质学 | 2752篇 |
海洋学 | 1266篇 |
天文学 | 339篇 |
综合类 | 520篇 |
自然地理 | 825篇 |
出版年
2024年 | 16篇 |
2023年 | 63篇 |
2022年 | 131篇 |
2021年 | 190篇 |
2020年 | 177篇 |
2019年 | 249篇 |
2018年 | 188篇 |
2017年 | 276篇 |
2016年 | 281篇 |
2015年 | 330篇 |
2014年 | 360篇 |
2013年 | 451篇 |
2012年 | 361篇 |
2011年 | 398篇 |
2010年 | 327篇 |
2009年 | 431篇 |
2008年 | 525篇 |
2007年 | 516篇 |
2006年 | 508篇 |
2005年 | 428篇 |
2004年 | 433篇 |
2003年 | 363篇 |
2002年 | 320篇 |
2001年 | 249篇 |
2000年 | 268篇 |
1999年 | 218篇 |
1998年 | 196篇 |
1997年 | 172篇 |
1996年 | 111篇 |
1995年 | 117篇 |
1994年 | 111篇 |
1993年 | 84篇 |
1992年 | 60篇 |
1991年 | 35篇 |
1990年 | 35篇 |
1989年 | 25篇 |
1988年 | 28篇 |
1987年 | 12篇 |
1986年 | 16篇 |
1985年 | 17篇 |
1984年 | 6篇 |
1983年 | 4篇 |
1981年 | 6篇 |
1980年 | 8篇 |
1979年 | 1篇 |
1976年 | 1篇 |
1974年 | 1篇 |
1954年 | 2篇 |
排序方式: 共有9105条查询结果,搜索用时 15 毫秒
91.
南海北缘东部盆地油气资源研究 总被引:5,自引:0,他引:5
南海北缘东部的珠江口盆地及台西南盆地蕴藏着十分丰富的油气资源,根据区域构造背景、盆地发育分布的特点及中、新生代的油气地质条件,结合含油气构造、油气田、油气井的分布规律,利用油气资源评价的理论、方法,对区内的油气资源进行了综合研究,并按照油气资源状况划分出油气富集区、油气潜力区、油气远景区,在此基础上,再进一步划分出4条油气富集带、11条油气潜力带、8条油气远景带,充分显示了该区石油、天然气的分布规律和油气地质特点,为商业性的勘探开发和理论研究奠定了基础。 相似文献
92.
利用1994年8-9月期间,由台湾海峡两岸的4艘海洋调查船在南海东北部海域所获之CTD和ADCP资料,并结合1992年3月间在同一海域获取的CTD资料及部分历史水文资料,对该区域的海水特性以及黑潮水入侵南海等问题进行了分析探讨。结果表明:调查期间,本海区水团分布与冬末、春初(1992年3月)航次基本相似,即南海和西北太平洋海域的海水结构有着各自相对独立的温、盐度特性。虽发现有黑潮水穿越巴上海峡进入南海,但其势力甚弱。因此,在夏末秋初,黑潮亦无直接的分支深入南海,即使在巴士海峡北端进入台湾海峡的黑潮水,其影响也是十分微弱的。由等密度面、地转流分析和实测ADCP资料显示,在调查海区的东南海域存在一支较强的N向流动。它沿菲律宾西海岸北上,绕过吕宋岛西北角流向东北,在巴上海峡呈现与黑潮水混合的迹象,其水体在冬季明显呈高温、低盐的特性;夏季则为相对低温、低盐。故在冬季的几幅卫星图像上也有较好的体现,很有可能长年存在。 相似文献
93.
The distribution and geochemical composition of suspended-particulate matter (SPM) in the East China Sea (ECS) were investigated
during the summer period of high continental runoff to elucidate SPM sources, distribution and cross-shelf transport. The
spatial variability of SPM distribution (0.3–6.5 mg l−1) and geochemical composition (POC, Al, Si, Fe, Mn, Ca, Mg and K) in the ECS was pronounced during summer when the continental
fluxes of freshwater and terrestrial materials were highest during the year. Under the influences of Changjiang runoff, Kuroshio
intrusion, surface production and bottom resuspension, the distribution generally showed strong gradients decreasing seaward
for both biogenic and lithogenic materials. Particulate organic carbon was enriched in surface water (mean ∼18%) due to the
influence of biological productivity, and was diluted by resuspended and/or laterally-transported materials in bottom water
(mean 9.4%). The abundance of lithogenic elements (Al, Si, Fe, Mn) increased toward the bottom, and the distribution correlations
were highly significant. Particulate CaCO3 distribution provided evidence that the SPM of the bottom water in the northern part of the study area was likely mixed with
sediments originally derived from Huanghe. A distinct benthic nepheloid layer (BNL) was present in all seaward transects of
the ECS shelf. Sediment resuspension may be caused by tidal fluctuation and other forcing and be regarded as the principal
agent in the formation of BNL. This BNL was likely responsible for the transport of biogenic and lithogenic particles across
or along the ECS shelf. Total inventories of SPM, POC and PN are 46, 2.8 and 0.4 Tg, respectively, measured over the total
area of 0.45 × 106 km2 of the ECS shelf. Their mean residence times are about 27, 13 and 11 days, respectively. The inventory of SPM in the water
column was higher in the northernmost and southernmost transects and lower in the middle transects, reflecting the influences
of terrestrial inputs from Changjiang and/or resuspended materials from Huanghe deposits in the north and perhaps from Minjiang
and/or Taiwan’s rivers in the south. The distribution and transport patterns of SPM and geochemical elements strongly indicate
that continental sources and cross-shelf transport modulate ECS particulate matter in summer. 相似文献
94.
Variations of the Kuroshio Axis South of Kyushu in Relation to the Large Meander of the Kuroshio 总被引:1,自引:0,他引:1
The characteristics of the Kuroshio axis south of Kyushu, which meanders almost sinusoidally, are clarified in relation to
the large meander of the Kuroshio by analyzing water temperature data during 1961–95 and sea level during 1984–95. The shape
of the Kuroshio axis south of Kyushu is classified into three categories of small, medium, and large amplitude of meander.
The small amplitude category occupies more than a half of the large-meander (LM) period, while the medium amplitude category
takes up more than a half of the non-large-meander (NLM) period. Therefore, the amplitude and, in turn, the curvature of the
Kuroshio axis is smaller on average during the LM period than the NLM period. The mean Kuroshio axis during the LM period
is located farther north at every longitude south of Kyushu than during the NLM period, with a slight difference west of the
Tokara Islands and a large difference to the east. A northward shift of the Kuroshio axis in particular east of the Tokara
Islands induces small amplitude and curvature of the meandering shape during the LM period. During the NLM period, the meandering
shape and position south of Kyushu change little with Kuroshio volume transport. In the LM formation stage, the variation
of the Kuroshio axis is small west of the Tokara Islands but large to the east due to a small meander of the Kuroshio. In
the LM decay stage, the Kuroshio meanders greatly south of Kyushu and is located stably near the coast southeast of Kyushu.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
95.
本文利用卫星高度计数据和分析数据,并结合同时期现场深水潜标的流速观测数据,研究了超强台风泰利过境前后台湾东北附近海域流场、位势密度场、位势涡度场以及黑潮入侵东海陆架强度的变化。分析结果表明,泰利台风通过改变台湾东北陆坡附近海域的流场、位势密度场,显著地削弱(增强)了西段(东段)陆坡附近的位势涡度梯度,从而使得西段(东段)陆坡黑潮入侵东海陆架的强度显著增强(减弱)。此外,本文还区分了台湾东北西部陆坡附近表层的跨陆坡“上凸型”位势涡度分布与次表层的跨陆坡“下凹型”位势涡度分布,并认为次表层的跨陆坡“下凹型”位势涡度分布也应作为台湾东北西部陆坡附近“位势涡度障碍”的重要组成部分。本文的研究结果揭示了大气中的台风过程对台湾东北黑潮入侵东海陆架产生显著影响的关键过程及机制,相关结论可为台湾东北黑潮入侵东海陆架变化规律的研究提供有价值的参考。 相似文献
96.
根据中、日合作黑潮调查研究期间(1987-1993年)在九州西侧海域获得的水文资料,计算了129°E断面的地转流速和流量。着重提出129°E断面北侧存在一支较稳定的西向流;分析这支西向流的去向,指出它是向对马暖流输送黑潮水的重要途径;给出了这支西向流及黑潮通过该断面的流速、流轴、流幅及流量的变化特征。 相似文献
97.
An overview of the Oyashio ecosystem 总被引:3,自引:0,他引:3
The Oyashio shelf region and the seasonally ice-covered areas north of Hokkaido are highly productive, supporting a wide range of species including marine mammals, seabirds and commercially important species in the western subarctic Pacific. The fishes include gadids, such as walleye pollock and Pacific cod, and subarctic migratory pelagic fishes such as chum salmon and pink salmon. It is also an important summer feeding ground for subtropical migrants such as the Japanese sardine, Japanese anchovy, Pacific saury, mackerels, Japanese common squid, whales and seabirds. In recent decades, some components of the Oyashio ecosystem (i.e., phytoplankton, mesozooplankton, gadid fish, and subtropical migrants) have shown changes in species abundance or distribution that are correlated with environmental changes such as the 1976/1977 and 1988/1989 regime shifts. The First Oyashio Intrusion moved northward from the mid-1960s until the late 1970s, when it moved southward until the 1980s, after which it returned to the north again after the mid-1990s. The sea-surface temperature in spring decreased after the late 1970s, increased after the late 1980s, and remained high during the 1990s. The extent of ice cover in the Sea of Okhostk also decreased during the latest warming in the 1980–1990s but has increased again since the late 1990s. This and other variabilities affect the Oyashio ecosystem and the surrounding region. 相似文献
98.
给出了提取潮汐调和常数的一种新方法--正交方法,并应用1992~1997年的TOPEX/POSEIDON卫星高度计遥感资料,提取中国海M2分潮调和常数.同时,利用最小二乘法来提取中国海M2分潮调和常数,两种方法结果比较渤海、黄海、东海海域M2分潮振幅、迟角的均方差分别是3.3 cm,3.6°;南中国海海域M2分潮振幅、迟角均方差分别是1.1 cm,1.7°,结果表明正交方法是一种可信的具有实用性的方法. 相似文献
99.
100.
Kyung-Il Chang Nelson G. Hogg Moon-Sik Suk Sang-Kyung Byun Young-Gyu Kim Kuh Kim 《Deep Sea Research Part I: Oceanographic Research Papers》2002,49(12)
The Ulleung Basin is one of three deep basins that are contained within the East/Japan Sea. Current meter moorings have been maintained in this basin beginning in 1996. The data from these moorings are used to investigate the mean circulation pattern, variability of deep flows, and volume transports of major water masses in the Ulleung Basin with supporting hydrographic data and help from a high-resolution numerical model. The bottom water within the Ulleung Basin, which must enter through a constricted passage from the north, is found to circulate cyclonically—a pattern that seems prevalent throughout the East Sea. A strong current of about 6 cms−1 on average flows southward over the continental slope off the Korean coast underlying the northward East Korean Warm Current as part of the mean abyssal cyclonic circulation. Volume transports of the northward East Korean Warm Current, and southward flowing East Sea Intermediate Water and East Sea Proper Water are estimated to be 1.4 Sv (1 Sv=10−6 m3 s−1), 0.8 Sv, and 3.0–4.0 Sv, respectively. Deep flow variability involves a wide range of time scales with no apparent seasonal variations, whereas the deep currents in the northern East Sea are known to be strongly seasonal. 相似文献