全文获取类型
收费全文 | 12163篇 |
免费 | 3347篇 |
国内免费 | 4743篇 |
专业分类
测绘学 | 2112篇 |
大气科学 | 1904篇 |
地球物理 | 2178篇 |
地质学 | 8099篇 |
海洋学 | 3064篇 |
天文学 | 114篇 |
综合类 | 1097篇 |
自然地理 | 1685篇 |
出版年
2024年 | 85篇 |
2023年 | 304篇 |
2022年 | 783篇 |
2021年 | 987篇 |
2020年 | 822篇 |
2019年 | 892篇 |
2018年 | 909篇 |
2017年 | 782篇 |
2016年 | 811篇 |
2015年 | 949篇 |
2014年 | 902篇 |
2013年 | 1112篇 |
2012年 | 1213篇 |
2011年 | 1194篇 |
2010年 | 1170篇 |
2009年 | 1066篇 |
2008年 | 1089篇 |
2007年 | 1034篇 |
2006年 | 918篇 |
2005年 | 754篇 |
2004年 | 574篇 |
2003年 | 338篇 |
2002年 | 382篇 |
2001年 | 364篇 |
2000年 | 319篇 |
1999年 | 159篇 |
1998年 | 60篇 |
1997年 | 47篇 |
1996年 | 38篇 |
1995年 | 29篇 |
1994年 | 12篇 |
1993年 | 18篇 |
1992年 | 21篇 |
1991年 | 11篇 |
1990年 | 13篇 |
1989年 | 4篇 |
1988年 | 6篇 |
1987年 | 14篇 |
1986年 | 6篇 |
1985年 | 5篇 |
1983年 | 5篇 |
1981年 | 3篇 |
1979年 | 5篇 |
1973年 | 3篇 |
1964年 | 3篇 |
1954年 | 7篇 |
1933年 | 3篇 |
1928年 | 2篇 |
1925年 | 4篇 |
1923年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 156 毫秒
31.
STUDY ON BEIJING''''S EMERGING MOBILE COMMUNICATION INDUSTRIAL CLUSTER AND ITS POLICY IMPLICATIONS 总被引:1,自引:0,他引:1
1INTRODUCTIONClusters,definedasgeographicallyproximategroupsofinterconnectedcompaniesandassociatedinstitutionsinparticularfields,linkedbycommonalitiesandcomple-mentarities(PORTER,2000),havearousedanintenseinterestofurbanandregionalplanningresearchersandpolicymakersoverthepastdecades.Itiswidelyrecog-nizedthatclusterscanpromoteproductivityandinno-vation,developlocalcompetitiveadvantages.Popular-izedbyMichaelPORTERinhisbook“TheCompetitiveAdvantageofNationsin1990,theclusterisnotanewcon… 相似文献
32.
ZHANG Jimin ) LIU Shuang ) SUN Xue ) YANG Guanpin ) ZHANG Xuecheng ) * GAO Zhenhui ) ) North China Sea Monitoring Center SOA Fushun Road Qingdao P..R.China) College of Marine Life Sciences Ocean University of China Qingdao P..R.China 《中国海洋大学学报(英文版)》2003,2(1)
1 Introduction Nannochloropsissp .areoneofpotentialsourcesofpolyunsaturatedfattyacids ,especiallytheeicosapen taentaenoicacid (EPA ,C2 0∶5 ) ,whichisimportantforbothanimalsandhumans . Thefattyacidcompositionofthisalgaisaffectedbyvariousenvironmentalfactors ,suchaslightintensity(Sukeniketal.,1989;Sukeniketal.,1990 ) ,imply ingthatafactorinfluencingthephotosyntheticprocessmayaffectcellularfattyacidsynthesisandtheirmetabolism .AselectionprogramofincreasingcellularEPAcontenthasbeencarriedo… 相似文献
33.
There are more than 600 Cenozoic volcanic cones and craters with abeut 50 000 km2of lava flows in northeast China, which formed many volcanic clusters and shown the features of the continental rift - type volcanoes. Most volcanic activities in this area, especially in the east part of Songliao graben, were usually controlled by rifts and faults with the main direction of NE / NNE in parallel and become younger from the central graben towards its both sides, especially to the east continental margin. It is revealed that the volcanism occurred in northeast China was as strong as that occurred in Japan during the Miocene and the Quaternary. The Quaternary basalt that is usually distributed along river valley is called "valley basalt"while Neogene basalt usually distributed in the top of mounts is called "high position basalt". These volcanoes and volcanic rocks are usually composed of alkaline basalts with ultramafic inclusions, except Changbaishan volcano that is built by trachyte and pantellerite. 相似文献
34.
35.
孙世春 《中国海洋湖沼学报》1995,(2)
Two nemerteans of the Zhoushan Islands, Paranemertes sinensis sp. nov. and P. peregrina, are reportedin this paper. P. sinensis sp. nov. has the body wall longitudinal musculature anteriorly divided,numerous eyes grouped into four clusters, two pairs of cephalic furrows, rhynchocoel 1/3 to 1/2 of fullbody length, cephalic glands well developed and posteriorly extending beyond the cerebral ganglia.precerebral septum absent, cerebral sense organs situated in front of brain, three pairs of nephridiopores,and 17-18 proboscis nerves. 相似文献
36.
A component (s-factor) with obvious promoting effect on hydrogen evolution of hydrogenase has beenisolated and extracted from a Cell=free preparation of Spirulina platensis.The effect of the s-factor in the re-action system is similar to that of Na_2S_2O_4, but is coupled with ligh. The s-factor has the maximumabsorption peak at 620 nm in the oxidized state, at 590 nm in the reduced state. The partially purifieds-factor showed two bands by SDS-PAGE and is distinctly different from phycocyanin,which has nochange of oxidized state and reduced state absorption spectra, and also has no promoting effect onhydrogenase of Spirulina platensis under the light. 相似文献
37.
原子钟噪声的蒙特卡络模拟方法 总被引:1,自引:0,他引:1
讨论了原子钟噪声的蒙特卡络模拟方法.具体过程是:先产生模拟所需的正态分布随机数,从实际钟的阿仑方差估算出噪声电平,然后用1组递点函数产生高质量的模拟钟时差的随机序列.在对1台商品铯钟进行具体模拟后,给出了真实数据与模拟值的阿仑方差之问的相符程度,最后对实际问题进行了分析. 相似文献
38.
39.
40.