全文获取类型
收费全文 | 672篇 |
免费 | 16篇 |
国内免费 | 2篇 |
专业分类
化学 | 512篇 |
晶体学 | 6篇 |
力学 | 20篇 |
数学 | 100篇 |
物理学 | 52篇 |
出版年
2023年 | 2篇 |
2022年 | 10篇 |
2021年 | 8篇 |
2020年 | 12篇 |
2019年 | 14篇 |
2018年 | 6篇 |
2017年 | 9篇 |
2016年 | 9篇 |
2015年 | 16篇 |
2014年 | 15篇 |
2013年 | 30篇 |
2012年 | 33篇 |
2011年 | 45篇 |
2010年 | 26篇 |
2009年 | 25篇 |
2008年 | 40篇 |
2007年 | 40篇 |
2006年 | 33篇 |
2005年 | 37篇 |
2004年 | 27篇 |
2003年 | 30篇 |
2002年 | 34篇 |
2001年 | 11篇 |
2000年 | 15篇 |
1999年 | 5篇 |
1998年 | 9篇 |
1997年 | 10篇 |
1996年 | 18篇 |
1995年 | 5篇 |
1994年 | 4篇 |
1993年 | 9篇 |
1992年 | 6篇 |
1991年 | 5篇 |
1990年 | 6篇 |
1989年 | 6篇 |
1987年 | 5篇 |
1986年 | 7篇 |
1985年 | 9篇 |
1984年 | 2篇 |
1983年 | 4篇 |
1982年 | 7篇 |
1981年 | 9篇 |
1980年 | 8篇 |
1979年 | 2篇 |
1978年 | 6篇 |
1977年 | 6篇 |
1976年 | 6篇 |
1973年 | 4篇 |
1970年 | 1篇 |
1927年 | 1篇 |
排序方式: 共有690条查询结果,搜索用时 15 毫秒
61.
62.
Christiane Albrecht Henning Böckemeier Mark Dennis Matthew D. Fletcher Vera Leitmann Richard Rowles Richard A. Stephenson Michael B. Hursthouse 《Tetrahedron letters》2008,49(1):185-188
The cyclisation of N-allyl- and N-homoallylguanidines using DMDO or I2/K2CO2 leading to novel heterocycles is reported. 相似文献
63.
64.
65.
66.
67.
68.
69.
Louis Cazaux Christiane Vidal Maurice Pasdeloup 《Magnetic resonance in chemistry : MRC》1983,21(3):190-195
Two 1,4-benzodiazepinones of psychopharmacological interest, pinazepam (2) and prazepam (3), were studied in solution by 13C and 1H NMR. 1H variable-temperature experiments showed that the seven-membered ring exists in a simple pseudo-boat form at room temperature, but the energy barrier is higher in 3 (ΔG405°c = 82.8 kJ mol?1) than in diazepam (1). Moreover, upon addition of LSR, the boat conformation is retained in the lanthanide ion-substrate complex, as with 1 in the solid state. Using a concentration-dependent shift technique and a computer-assisted LIS method, the conformations of the N-branched side-chain were investigated. Two preferred orientations were found for the propargyl group of 2, while three unequally populated conformations of the cyclopropyl moiety of 3 are distributed preferentially in the sterically unhindered space around the complex. 相似文献
70.
Guinot C Malvy DJ Latreille J Ezzedine K Galan P Tenenhaus M Ambroisine L Hercberg S Tschachler E 《Photochemistry and photobiology》2005,81(4):934-940
Phototype classifications were initially developed in an attempt to predict the skin reactions of patients to phototherapy and are now widely used to advise individuals with regard to sun protection. A transversal study was conducted on the SU.VI.MAX cohort to estimate the frequency of sun-reactive skin features in a large, general adult population-based sample, and to describe the associations between these features. The data were collected 3 years after the beginning of the SU.VI.MAX nutritional intervention study on 4912 volunteers (2868 women aged 35-60 years and 2044 men aged 45-60 years). A multiple correspondence analysis was performed to study the associations between the features. The results showed that these features correspond to a one-dimensional phenomenon, which allowed us to establish a score to summarize skin sensitivity to sun exposure. Furthermore, we found a link between gender and phototype using the Césarini classification (phototype > or = IV: 37% of women, 47% of men). The analysis of the relationship with sun-reactive skin features and the score revealed the same trend. Phenotypic evaluation appears to be a good estimator of skin sensitivity to sun exposure for clinical screening or for use in research, and is easy to collect at a lower cost. Moreover, the sun sensitivity difference between gender should be considered in education about photoprotection. 相似文献