全文获取类型
收费全文 | 52篇 |
免费 | 1篇 |
专业分类
化学 | 15篇 |
数学 | 34篇 |
物理学 | 4篇 |
出版年
2024年 | 1篇 |
2020年 | 1篇 |
2019年 | 4篇 |
2018年 | 2篇 |
2017年 | 1篇 |
2015年 | 1篇 |
2014年 | 4篇 |
2013年 | 1篇 |
2012年 | 2篇 |
2011年 | 2篇 |
2009年 | 3篇 |
2006年 | 4篇 |
2005年 | 1篇 |
2004年 | 2篇 |
2003年 | 2篇 |
2002年 | 1篇 |
2001年 | 3篇 |
2000年 | 3篇 |
1999年 | 3篇 |
1998年 | 1篇 |
1997年 | 1篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1993年 | 2篇 |
1989年 | 1篇 |
1984年 | 1篇 |
1973年 | 1篇 |
1967年 | 2篇 |
排序方式: 共有53条查询结果,搜索用时 15 毫秒
21.
We consider a fluid model fed by two Gaussian processes. We obtain necessary and sufficient conditions for the workload asymptotics to be completely determined by one of the two processes, and apply these results to the case of two fractional Brownian motions. 相似文献
22.
23.
Generation of Molecular Complexity from Cyclooctatetraene: Preparation of Aminobicyclo[5.1.0]octitols 下载免费PDF全文
Dr. Mohamed F. El‐Mansy Matthew Flister Dr. Sergey Lindeman Kelsey Kalous Prof. Daniel S. Sem Prof. William A. Donaldson 《Chemistry (Weinheim an der Bergstrasse, Germany)》2015,21(30):10886-10895
A series of eight stereoisomeric N‐(tetrahydroxy bicyclo‐[5.1.0]oct‐2S*‐yl)phthalimides were prepared in one to four steps from N‐(bicyclo[5.1.0]octa‐3,5‐dien‐2‐yl)phthalimide (±)‐ 7 , which is readily available from cyclooctatetraene (62 % yield). The structural assignments of the stereoisomers were established by 1H NMR spectral data as well as X‐ray crystal structures for certain members. The outcomes of several epoxydiol hydrolyses, particularly ring contraction and enlargement, are of note. The isomeric phthalimides as well as the free amines did not exhibit β‐glucosidase inhibitory activity at a concentration of less than 100 μM . 相似文献
24.
We introduce a novel class of tandem queueing networks which arise in modeling the congestion behavior of wireless multi-hop networks with distributed medium access control. These models provide valuable insight in how the network performance in terms of throughput depends on the back-off mechanism that governs the competition among neighboring nodes for access to the medium. The models fall at the interface between classical queueing networks and interacting particle systems, and give rise to high-dimensional stochastic processes that challenge existing methodologies. We present various open problems and conjectures, which are supported by partial results for special cases and limit regimes as well as simulation experiments. 相似文献
25.
David EB de Carvalho TB Oliveira CM Coradi ST Sforcin JM Guimarães S 《Natural product research》2012,26(4):370-374
Results from our laboratory revealed propolis activity on Giardia trophozoites proliferation. Since therapeutic agents can inhibit the activity of proteases related to relevant biologic and physiologic processes of parasites, this study was undertaken to characterise the proteolytic activity of excretory/secretory products (ESP) of trophozoites treated with propolis. ESP was obtained from culture supernatants of trophozoites exposed to 250 and 500 μg mL(-1) of propolis. ESP were tested in sodium dodecyl sulfate-polyacrylamide gel electrophoresis for the protein profiles and the protease activity was assayed in gelatin-containing gels. Synthetic inhibitors were used to characterise the protease classes. Treated and non-treated ESP showed a similar protein and hydrolysis pattern. A simple pattern of protein composed by five evident bands of approximately 167, 132, 79, 61 and 51 kDa was found, and the zymograms comprised hydrolysis zones distributed from >170 to 23 kDa. No inhibition was seen on protease activity of propolis-treated trophozoites, whose hydrolysis pattern was similar to control. One may conclude that both ESP degraded gelatin and the activity was predominantly due to cysteine proteases. Although propolis had no effect on the proteolytic activity, further studies could identify the active constituents responsible for propolis antigiardial activity and their mechanisms of action. 相似文献
26.
27.
28.
Siberian Mathematical Journal - 相似文献
29.
30.
Siberian Mathematical Journal - 相似文献