全文获取类型
收费全文 | 3012篇 |
免费 | 454篇 |
国内免费 | 761篇 |
专业分类
测绘学 | 241篇 |
大气科学 | 884篇 |
地球物理 | 414篇 |
地质学 | 1057篇 |
海洋学 | 303篇 |
天文学 | 989篇 |
综合类 | 150篇 |
自然地理 | 189篇 |
出版年
2024年 | 10篇 |
2023年 | 20篇 |
2022年 | 78篇 |
2021年 | 57篇 |
2020年 | 49篇 |
2019年 | 74篇 |
2018年 | 44篇 |
2017年 | 77篇 |
2016年 | 113篇 |
2015年 | 83篇 |
2014年 | 169篇 |
2013年 | 161篇 |
2012年 | 205篇 |
2011年 | 115篇 |
2010年 | 151篇 |
2009年 | 208篇 |
2008年 | 229篇 |
2007年 | 250篇 |
2006年 | 277篇 |
2005年 | 277篇 |
2004年 | 164篇 |
2003年 | 199篇 |
2002年 | 177篇 |
2001年 | 160篇 |
2000年 | 111篇 |
1999年 | 140篇 |
1998年 | 92篇 |
1997年 | 68篇 |
1996年 | 77篇 |
1995年 | 79篇 |
1994年 | 60篇 |
1993年 | 82篇 |
1992年 | 53篇 |
1991年 | 42篇 |
1990年 | 19篇 |
1989年 | 15篇 |
1988年 | 8篇 |
1987年 | 3篇 |
1986年 | 11篇 |
1985年 | 6篇 |
1984年 | 3篇 |
1983年 | 5篇 |
1980年 | 2篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1975年 | 1篇 |
排序方式: 共有4227条查询结果,搜索用时 15 毫秒
71.
LAPP对中国对虾(Penaeus chinensis)生长、缺氧耐受力及免疫抵抗力的影响 总被引:11,自引:0,他引:11
实验研究维生素C多聚磷酸酯(LAPP)添加在对虾饲料中,对中国对虾的生长、缺氧耐受力及免疫抵抗力的影响;实验进一步证明了中国对虾饲料中LAPP的最适添加量为400mg/100g饲料;本文还提出饲料中的LAPP能够提高中国对虾的缺氧耐受力,在溶氧超过3.1mg/kg海水的情况下,效果显著,在降低到2.3mg/kg海水时,作用减弱;用副溶血弧菌(Vibroparahaemolyticus)注射入虾体内,12小时内记录发现,饲料中不含LAPP的一组中国对虾,死亡率高于其它组,并且,LAPP含量最高的一组,死亡率明显低,死亡时间也出现较晚,这证明LAPP能够提高中国对虾的免疫抵抗力;本实验用注射金黄色葡萄球菌后细胞的吞噬百分率作指标,研究对虾细胞的吞噬作用,发现饲料中不含LAPP的对虾的吞噬百分率较低,随着饲料中LAPP浓度的提高,对虾血细胞的吞噬百分率逐渐升高,说明中国对虾细胞的吞噬作用逐步增强。 相似文献
72.
73.
74.
75.
Ryoko Tokeshi Kaoru Ichikawa Satoshi Fujii Kenji Sato Shoichiro Kojima 《Journal of Oceanography》2007,63(4):711-720
A method to extract geostrophic current in the daily mean HF radar data in the Kuroshio upstream region is established by
comparison with geostrophic velocity determined from the along-track altimetry data. The estimated Ekman current in the HF
velocity is 1.2% (1.5%) and 48° (38°)-clockwise rotated with respect to the daily mean wind in (outside) the Kuroshio. Furthermore,
additional temporal smoothing is found necessary to remove residual ageostrophic currents such as the inertial oscillation.
After removal of the ageostrophic components, the HF geostrophic velocity agrees well with that from the altimetry data with
rms difference 0.14 (0.12) m/s in (outside) the Kuroshio. 相似文献
76.
Access to information about past states of the environment and social systems is fundamental to understand, and cope with, the challenges of climate change and over-exploitation of natural resources at the onset of the 21st century. The loss of (old) data is a major threat to understanding better and mitigating long-term effects of human activities and anthropogenic changes to the environment. Although this is intuitively evident for old and local literature of any kind, even present-day international publishing of papers without the underlying raw data makes access to basic information a crucial issue. Here, we summarise experience resulting from a EU-funded International Science & Technology Cooperation (INCO) project (CENSOR) addressing Coastal Ecosystem Research and Management in the El Niño Southern Oscillation (ENSO) context. We show that indeed “Grey Literature” is still one of the most important sources of knowledge about natural science research and management of natural resource systems in Latin American countries. We argue that public archiving of original data of present-day research and old (Grey) Literature and easy public access are important for appreciating today's global environmental challenges caused by human activities, both past and present. 相似文献
77.
As a new method, the ultraviolet spectrum technique is applied to studying the connectivity of biode-gradable heavy oil reservoirs. The similarity of crude oils can be judged according to the extinction coefficient (E) because aromatic hydrocarbons and non-hydrocarbons have conjugated bonds and obvious absorption in the ultraviolet range, and different materials have different characteristics and additives. The relationship diagram is made in terms of the extinction coefficients (E) of the samples by taking E as the Y-axis and wavelength as the X-axis. The connectivity of oil reservoirs is estimated according to the curve positions and characteristic fingerprints of the sampies. The connectivity of part of the reservoirs in the western part of the QHD32-6 oilfield was studied with this method. The results showed that the connectivity of samples from wells F7 and F8 in the Nm-2 oil reservoir zone is good, that of samples from wells F17 and F20 in the Nm-1 oil reservoir zone also is good, and that of samples from wells F17, F19, and F20 is poor. 相似文献
78.
79.
安徽池州铜山铜矿深部找矿实践与启示 总被引:4,自引:0,他引:4
铜山铜矿资源储量日益枯竭。危机矿山接替资源勘查中,采用地质、物探综合手段圈定异常区,经深部钻探验证,取得突破。 相似文献
80.