全文获取类型
收费全文 | 107篇 |
免费 | 0篇 |
专业分类
化学 | 17篇 |
数学 | 11篇 |
物理学 | 79篇 |
出版年
2021年 | 1篇 |
2017年 | 2篇 |
2015年 | 1篇 |
2013年 | 6篇 |
2012年 | 2篇 |
2011年 | 3篇 |
2010年 | 4篇 |
2009年 | 1篇 |
2008年 | 1篇 |
2007年 | 4篇 |
2006年 | 7篇 |
2005年 | 3篇 |
2004年 | 2篇 |
2002年 | 2篇 |
2001年 | 2篇 |
2000年 | 7篇 |
1999年 | 6篇 |
1998年 | 4篇 |
1996年 | 7篇 |
1995年 | 3篇 |
1994年 | 11篇 |
1993年 | 9篇 |
1992年 | 5篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 4篇 |
1985年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1974年 | 1篇 |
1969年 | 2篇 |
排序方式: 共有107条查询结果,搜索用时 0 毫秒
91.
本文报导了采用氩离子激光器来泵浦Rr ̄(3+):YLF晶体,应用声光调制器实现了主动锁模;同时应用振动─高反射平面镜也实现了被动锁模,两种锁模均得到了ps光脉冲。据作者了解这是这种晶体材料的第一次锁模运转。 相似文献
92.
L. Brossard R. Clerac C. Coulon M. Tokumoto T. Ziman D.K. Petrov V.N. Laukhin M.J. Naughton A. Audouard F. Goze A. Kobayashi H. Kobayashi P. Cassoux 《The European Physical Journal B - Condensed Matter and Complex Systems》1998,1(4):439-452
In order to understand the magnetic field-induced restoration of a highly conductive state in , static (SQUID) and dynamic (ESR and AFR) magnetization measurements were performed on polycrystalline samples and single
crystals, respectively. In addition, cantilever and resistivity measurements under steady fields were performed. While the
metal-insulator transition curve of the () phase diagram exhibits a first order character, a “spin-flop” transition line divides the insulating state when the magnetic
field is applied along the easy axis of magnetization. The effects of a RKKY-type indirect exchange and of applied magnetic
field are described within the framework of a generalized Kondo lattice, namely two chains of localised spins coupled through the itinerant spins of the 2D sheets of BETS. The calculations, which can incorporate intramolecular
electron correlations within a mean field theory, are in qualitative agreement with the field induced transition from the
antiferromagnetic insulating ground state to a canted one, i.e. a not fully oriented paramagnetic, but metallic state.
Received: 6 August 1997 / Received: 5 November 1997 / Accepted: 10 November 1997 相似文献
93.
S. D. Ziman 《Journal of heterocyclic chemistry》1979,16(5):895-896
Reaction of thionyl chloride and semicarbazides or thiosemicarbazides produces the novel 1-oxo-1,2,3,5-thiatriazolidin-4-one or 4-thione ring system. 相似文献
94.
95.
Alves GA Amato S Anjos JC Appel JA Astorga J Bracker SB Cremaldi LM Dagenhart WD Darling CL Dixon RL Errede D Fenker HC Gay C Green DR Jedicke R Karchin PE Kennedy C Kwan S Lueking LH de Mello Neto JR Metheny J Milburn RH de Miranda JM da Motta Filho H Napier A Passmore D Rafatian A dos Reis AC Ross WR Santoro AF Sheaff M Souza MH Spalding WJ Stoughton C Streetman ME Summers DJ Takach SF Wallace A Wu Z 《Physical review letters》1996,77(12):2392-2395
96.
97.
98.
99.
LL Handley R Azcón Ruiz Lozano JM CM Scrimgeour 《Rapid communications in mass spectrometry : RCM》1999,13(13):1320-1324
It has long been evident that plant (15)N chiefly reflects the processes which fractionate (15)N/(14)N rather than the (15)N of plant N source(s). It has emerged recently that one of the most important fractionating processes contributing to the whole plant (15)N is the presence/absence, type or species of mycorrhiza, especially when interacting with nutrient deficiency. Ecto- and ericoid mycorrhizas are frequently associated with (15)N-depleted foliar (15)N, commonly as low as -12 per thousand. As shown by the present study, plants having no mycorrhiza, or those infected with various species of arbuscular mycorrhiza (AM)-forming fungi, interact with varying concentrations of soil nitrogen [N] and moisture to enrich plant (15)N by as much as 3.5 per thousand. Hence the lack of a mycorrhiza, or variation in the species of AM-forming fungal associations, can account for about 25% of the usually reported variations of foliar (15)N found in field situations and do so by (15)N enrichment rather than depletion. Copyright 1999 John Wiley & Sons, Ltd. 相似文献
100.