全文获取类型
收费全文 | 206篇 |
免费 | 9篇 |
专业分类
林业 | 4篇 |
基础科学 | 1篇 |
10篇 | |
综合类 | 86篇 |
农作物 | 5篇 |
水产渔业 | 5篇 |
畜牧兽医 | 91篇 |
园艺 | 1篇 |
植物保护 | 12篇 |
出版年
2023年 | 2篇 |
2020年 | 4篇 |
2019年 | 2篇 |
2018年 | 5篇 |
2017年 | 3篇 |
2016年 | 2篇 |
2015年 | 4篇 |
2014年 | 4篇 |
2013年 | 3篇 |
2012年 | 4篇 |
2011年 | 7篇 |
2010年 | 6篇 |
2008年 | 3篇 |
2007年 | 5篇 |
2006年 | 4篇 |
2005年 | 7篇 |
2004年 | 4篇 |
2003年 | 6篇 |
2002年 | 4篇 |
2001年 | 4篇 |
1999年 | 4篇 |
1998年 | 8篇 |
1997年 | 5篇 |
1996年 | 12篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 4篇 |
1992年 | 4篇 |
1991年 | 6篇 |
1990年 | 7篇 |
1989年 | 3篇 |
1988年 | 2篇 |
1987年 | 3篇 |
1986年 | 4篇 |
1984年 | 3篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1972年 | 2篇 |
1968年 | 2篇 |
1967年 | 2篇 |
1966年 | 2篇 |
1963年 | 3篇 |
1918年 | 4篇 |
1916年 | 2篇 |
1911年 | 2篇 |
1902年 | 2篇 |
1893年 | 2篇 |
1883年 | 1篇 |
1881年 | 1篇 |
1880年 | 1篇 |
排序方式: 共有215条查询结果,搜索用时 15 毫秒
61.
Askebjer P Barwick SW Bergström L Bouchta A Carius S Coulthard A Engel K Erlandsson B Goobar A Gray L Hallgren A Halzen F Hulth PO Jacobsen J Johansson S Kandhadai V Liubarsky I Lowder D Miller T Mock PC Morse R Porrata R Price PB Richards A Rubinstein H Schneider E Sun Q Tilav S Walck C Yodh G 《Science (New York, N.Y.)》1995,267(5201):1147-1150
The optical properties of the ice at the geographical South Pole have been investigated at depths between 0.8 and 1 kilometer. The absorption and scattering lengths of visible light ( approximately 515 nanometers) have been measured in situ with the use of the laser calibration setup of the Antarctic Muon and Neutrino Detector Array (AMANDA) neutrino detector. The ice is intrinsically extremely transparent. The measured absorption length is 59 +/- 3 meters, comparable with the quality of the ultrapure water used in the Irvine-Michigan-Brookhaven and Kamiokande proton-decay and neutrino experiments and more than twice as long as the best value reported for laboratory ice. Because of a residual density of air bubbles at these depths, the trajectories of photons in the medium are randomized. If the bubbles are assumed to be smooth and spherical, the average distance between collisions at a depth of 1 kilometer is about 25 centimeters. The measured inverse scattering length on bubbles decreases linearly with increasing depth in the volume of ice investigated. 相似文献
62.
63.
64.
65.
66.
67.
Morse WF 《Science (New York, N.Y.)》1893,22(566):316-317
68.
Morse FW 《Science (New York, N.Y.)》1893,21(543):357-358
69.
70.
gamma-Aminobutyric acid (a simple amino acid and potent neurotransmitter in human brain and other tissues of higher animals) and certain of its congeners rapidly and synchronously induce planktonic larvae of the red abalone, Haliotis rufescens, to settle and commence behavioral and developmental metamorphosis. These naturally occurring inducers of algal origin apparently are responsible, in part, for the substrate-specific recruitment, induction of settling, and the onset of metamorphosis of abalone and other planktonic larvae upon specific algae which provide naturally favorable habitats for the young of these species in coastal waters. These observations provide a convenient experimental model for further analysis of the basic molecular mechanisms by which environmental and endogenous factors control the recruitment and development of planktonic larvae. Halogenated organic pesticides significantly interfere with larval settling, as quantified in a new bioassay based upon these findings. 相似文献