全文获取类型
收费全文 | 1164篇 |
免费 | 102篇 |
国内免费 | 264篇 |
专业分类
测绘学 | 18篇 |
大气科学 | 10篇 |
地球物理 | 265篇 |
地质学 | 138篇 |
海洋学 | 822篇 |
天文学 | 65篇 |
综合类 | 110篇 |
自然地理 | 102篇 |
出版年
2024年 | 7篇 |
2023年 | 22篇 |
2022年 | 41篇 |
2021年 | 40篇 |
2020年 | 41篇 |
2019年 | 43篇 |
2018年 | 49篇 |
2017年 | 50篇 |
2016年 | 55篇 |
2015年 | 47篇 |
2014年 | 76篇 |
2013年 | 84篇 |
2012年 | 62篇 |
2011年 | 63篇 |
2010年 | 65篇 |
2009年 | 67篇 |
2008年 | 71篇 |
2007年 | 65篇 |
2006年 | 63篇 |
2005年 | 54篇 |
2004年 | 50篇 |
2003年 | 48篇 |
2002年 | 39篇 |
2001年 | 39篇 |
2000年 | 51篇 |
1999年 | 20篇 |
1998年 | 42篇 |
1997年 | 28篇 |
1996年 | 27篇 |
1995年 | 11篇 |
1994年 | 18篇 |
1993年 | 17篇 |
1992年 | 14篇 |
1991年 | 7篇 |
1990年 | 9篇 |
1989年 | 2篇 |
1988年 | 3篇 |
1987年 | 3篇 |
1986年 | 3篇 |
1985年 | 10篇 |
1984年 | 7篇 |
1983年 | 6篇 |
1982年 | 4篇 |
1981年 | 5篇 |
1980年 | 2篇 |
排序方式: 共有1530条查询结果,搜索用时 486 毫秒
71.
72.
73.
S. Nakamoto S. Prasanna Kumar J. M. Oberhuber H. Saito K. Muneyama R. Frouin 《Journal of Earth System Science》2002,111(3):339-349
Western tropical Indian Ocean, Arabian Sea, and the equatorial Pacific are known as regions of intense bio-chemical-physical
interactions: the Arabian Sea has the largest phytoplankton bloom with seasonal signal, while the equatorial Pacific bloom
is perennial with quasi-permanent upwelling. Here, we studied three dimensional ocean thermodynamics comparing recent ocean
observation with ocean general circulation model (OPYC) experiment combined with remotely sensed chlorophyll pigment concentrations
from the Coastal Zone Color Scanner (CZCS). Using solar radiation parameterization representing observations that a higher
abundance of chlorophyll increases absorption of solar irradiance and heating rate in the upper ocean, we showed that the
mixed layer thickness decreases more than they would be under clear water conditions. These changes in the model mixed layer
were consistent with Joint Global Ocean Flux Study (JGOFS) observations during the 1994-1995 Arabian Sea experiment and epi-fluorescence
microscopy (EFM) on samples collected during Equatorial Pacific Ocean Climate Study (EPOCS) in November, 1988. In the Arabian
Sea, as the chlorophyll concentrations peak in October (3 mg/m3) after the summer plankton bloom induced by coastal upwelling, the chlorophyll induced biological heating enhanced the sea
surface temperature (SST) by as much as 0.6‡C and sub-layer temperature decreases and sub-layer thickness increases. In the
equatorial Pacific, modest concentrations of chlorophyll less than 0.3 mg/m3 is enough to introduce a meridional differential heating, which results in reducing the equatorial mixed layer thickness
to more than 20 m. The anomalous meridional tilting of the mixed layer bottom enhances off equatorial westward geostrophic
currents. Consequently, the equatorial undercurrent transports more water from west to east. We proposed that these numerical
model experiments with use of satellite andin situ ocean observations are consistent under three dimensional ocean circulation theory combined with solar radiation transfer
process. 相似文献
74.
Based on Coastal Zone Color Scanner data from November 1978 through December 1981, the seasonal cycle of phytoplankton pigment
in the upper part of the euphotic zone is established for the offshore Laccadive Sea. Year-round, the pigment content is low
and the seasonal range is small, following the pattern of the nutrient-poor Arabian Sea to the west. Apparently, indigenous
phytoplankton blooms are absent. July and August, however, were poorly studied because of cloud cover. Interannual differences
during the northeast monsoon and the spring intermonsoon periods are minor. The abundant phytoplankton caused by the upwelling
off India during the southwest monsoon remains essentially restricted to the shelf, but there are occasional large, zonal
outbreaks into the Laccadive Sea, as well as others advected to the south of India. Visual inspection of the raw CZCS scenes
for June through November 1982–1985, with almost no data until August or even September, shows such outbreaks of pigment-rich
water to be common. Inspection of monthly SeaWiFS images for 1997 through part of 2001 confirms the absence of indigenous
phytoplankton blooms. 相似文献
75.
中外饭店区域集团化特征对比研究 总被引:7,自引:0,他引:7
随着饭店业全球化进程的发展,饭店之间的竞争日趋激烈,国际饭店集团的出现使国际旅游市场和饭店业都发生了极大的变化。与中国饭店集团相比,国际饭店集团具有诸多竞争优势,本文将以世界饭店集团300强为例,与中国饭店区域集团化特征进行对比分析,从而为中国饭店业借鉴国际饭店集团成功经验,应对其挑战提供启示。 相似文献
76.
77.
78.
Yoshiko Kawabata Hiroyuki Nakahara Yukio Katayama Norio Ishida 《International Journal of Salt Lake Research》1997,6(1):5-16
The Aral Sea, Lake Balkhash, and Lake Kamyslybas are closed lakes in Central Asia. They range from oligosaline to metasaline.
The salinity of the Aral Sea has increased by more than 30 g L−1 since widespread irrigation began in its catchment area. Few studies of the phytoplankton have been conducted on these lakes
since extensive irrigation started. The investigation reported here compares the flora of phytoplankton in these saline lakes.
In the Small Aral Sea, phytoplankton density gradually decreased with increasing electrical conductivity (EC) (∼ salinity),
but there was no such relation in Lake Balkhash and Lake Kamyslybas. In the Aral Sea, Dinophyceae and Bacillariophyceae were
frequently observed in most areas of high EC value, and Cyanophyceae were most conspicuous in the area of medium and lower
EC values. In Lake Balkhash, Cyanophyceae were most conspicuous, but Chlorophyceae were also noticeable. Most Cyanophyceae
in Aral Sea formed filaments with heterocysts. The distinct characteristic of the phytoplankton of the Lake Balkhash was that
all dominant species form colonies covered with a gelatinous film. Siliceousplankton diversity gradually decreased with increasing
EC values in the Aral Sea and Lake Balkhash. 相似文献
79.
自1992年4月12日至12月30日对中山站以西内拉峡湾海冰和冰下水柱中藻类优势种组成和丰度进行了测定。4月份和11月中旬至12月中旬冰柱和水柱(0~50m)藻类丰度高达108~109cels/m2。冰藻的普遍或季节性优势种主要包括Amphiprorakjelmani、Berkeleyarutilans、Naviculaglaciei、Nitzschiabarkleyi、N.cylindrus、N.lecointei和Nitzschiasp.。由于藻类结合入冰后自身的演替,春-夏季海冰剖面中所记录的优势种组成并不能准确反映冰底优势种的季节演替过程。从冰底和水表藻种组成的对比表明,两者仅在春末冰底冰藻水华期间具有较强的相似性。秋、春季冰底冰藻水华的形成以现场生长为主,夏初冰藻释放入水后对冰下浮游植物的播种作用不明显。 相似文献
80.
The application of X-ray photoelectron spectroscopy (XPS) to coal surface characterisation for preparation research is described. Progress towards the acquisition of complementary surface chemical information by time-of-flight secondary ion mass spectrometry (ToF-SIMS) is also discussed. Surface-based beneficiation techniques such as flotation are assuming greater importance as the proportion of fines in raw coal increases due to the proliferation of high capacity mining methods. A necessary condition for the floatability of a coal particle is adequate hydrophobicity, and the degree of hydrophobicity of the flotation concentrate is one factor influencing the ease with which its dewatering can be affected. The hydrophobicity of a coal is very difficult to measure directly because of microporosity, and it is often necessary to deduce the degree of hydrophobicity from a knowledge of the surface chemistry. XPS is able to provide sufficient analytical data to allow relative levels of hydrophobicity to be estimated. In principle, ToF-SIMS should be able to supply additional information enabling refinement of such estimates; however, there are insufficient data at present to allow the ionic fragments detected to be related to specific functional groups at the coal surface. 相似文献