全文获取类型
收费全文 | 75篇 |
免费 | 1篇 |
专业分类
化学 | 37篇 |
晶体学 | 4篇 |
力学 | 1篇 |
数学 | 1篇 |
物理学 | 11篇 |
无线电 | 22篇 |
出版年
2022年 | 4篇 |
2021年 | 3篇 |
2018年 | 2篇 |
2017年 | 1篇 |
2014年 | 1篇 |
2013年 | 1篇 |
2012年 | 2篇 |
2011年 | 2篇 |
2010年 | 3篇 |
2009年 | 10篇 |
2008年 | 5篇 |
2007年 | 8篇 |
2006年 | 2篇 |
2005年 | 2篇 |
2004年 | 1篇 |
2002年 | 2篇 |
2000年 | 2篇 |
1999年 | 3篇 |
1998年 | 3篇 |
1996年 | 3篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1990年 | 2篇 |
1989年 | 4篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 2篇 |
1978年 | 1篇 |
1973年 | 1篇 |
1972年 | 1篇 |
排序方式: 共有76条查询结果,搜索用时 15 毫秒
21.
Ristic V. M. Dubois G. R. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》1978,6(4):550-551
The measurement of time-dependent spark-gap resistance in short-duration, short-gap pulsed discharges with metallic and semimetallic cathodes was made. It is shown that at high currents the ratio of the spark-gap resistance of semimetallic cathodes to that of metallic cathodes decrease by an order of magnitude. 相似文献
22.
V.M. Ristic 《Physics letters. A》1973,43(6):499-500
The coupled dispersion relation resulting from the interaction of acoustic waves with an infinity long conducting grating deposited along the pure mode axis of a piezoelectric crystal of trigonal class is specified and its implications on different kinds of mode coupling are discussed. 相似文献
23.
Balazs Kobzi Erno Kuzmann Zoltan Homonnay Stjepko Krehula Mira Ristic Shiro Kubuki 《Journal of Radioanalytical and Nuclear Chemistry》2018,316(2):579-586
Tin silicate glass without SnOx nanoparticles (SiO2·SnOx), a silica glass containing only SnOx nanoparticles (SiO2·SnOxNP) and the improved product, which combines the tin silicate glass with SnOx nanoparticles (SiO2·SnOx·SnOxNP) was prepared. For the structural analysis 119Sn Mössbauer spectroscopy and X-ray diffraction were applied. The 119Sn Mössbauer spectra showed that the SiO2·SnOx·SnOxNP sample had the largest SnII content (12.0%). It also had an outstanding methylene blue degradation with the first-order rate value with (18?±?2) × 10?3 min?1 with visible light irradiation. 相似文献
24.
Kirchmair J Ristic S Eder K Markt P Wolber G Laggner C Langer T 《Journal of chemical information and modeling》2007,47(6):2182-2196
In continuation of our recent studies on the quality of conformational models generated with CATALYST and OMEGA we present a large-scale survey focusing on the impact of conformational model quality and several screening parameters on pharmacophore-based and shape-based virtual high throughput screening (vHTS). Therefore, we collected known active compounds of CDK2, p38 MAPK, PPAR-gamma, and factor Xa and built a set of druglike decoys using ilib:diverse. Subsequently, we generated 3D structures using CORINA and also calculated conformational models for all compounds using CAESAR, CATALYST FAST, and OMEGA. A widespread set of 103 structure-based pharmacophore models was developed with LigandScout for virtual screening with CATALYST. The performance of both database search modes (FAST and BEST flexible database search) as well as the fit value calculation procedures (FAST and BEST fit) available in CATALYST were analyzed in terms of their ability to discriminate between active and inactive compounds and in terms of efficiency. Moreover, these results are put in direct comparison to the performance of the shape-based virtual screening platform ROCS. Our results prove that high enrichment rates are not necessarily in conflict with efficient vHTS settings: In most of the experiments, we obtained the highest yield of actives in the hit list when parameter sets for the fastest search algorithm were used. 相似文献
25.
A model of air coolers with a family of movable Tamman's test tubes, installed in a laboratory chamber furnace, crucible furnace and tube furnace, which allows regulation and simultaneous crystallization of several substances at different temperature gradients and crystallization rate intervals, for obtaining crystals are presented. 相似文献
26.
Michael E. Slaney D. Jason Anderson Dusan Ristic‐Petrovic Dr. Robert McDonald Prof. Dr. Martin Cowie 《Chemistry (Weinheim an der Bergstrasse, Germany)》2012,18(15):4723-4737
The bridging fluoroolefin ligands in the complexes [Ir2(CH3)(CO)2(μ‐olefin)(dppm)2][OTf] (olefin=tetrafluoroethylene, 1,1‐difluoroethylene; dppm=μ‐Ph2PCH2PPh2; OTf?=CF3SO3?) are susceptible to facile fluoride ion abstraction. Both fluoroolefin complexes react with trimethylsilyltriflate (Me3SiOTf) to give the corresponding fluorovinyl products by abstraction of a single fluoride ion. Although the trifluorovinyl ligand is bound to one metal, the monofluorovinyl group is bridging, bound to one metal through carbon and to the other metal through a dative bond from fluorine. Addition of two equivalents of Me3SiOTf to the tetrafluoroethylene‐bridged species gives the difluorovinylidene‐bridged product [Ir2(CH3)(OTf)(CO)2(μ‐OTf)(μ‐C?CF2)(dppm)2][OTf]. The 1,1‐difluoroethylene species is exceedingly reactive, reacting with water to give 2‐fluoropropene and [Ir2(CO)2(μ‐OH)(dppm)2][OTf] and with carbon monoxide to give [Ir2(CO)3(μ‐κ1:η2‐C?CCH3)(dppm)2][OTf] together with two equivalents of HF. The trifluorovinyl product [Ir2(κ1‐C2F3)(OTf)(CO)2(μ‐H)(μ‐CH2)(dppm)2][OTf], obtained through single C? F bond activation of the tetrafluoroethylene‐bridged complex, reacts with H2 to form trifluoroethylene, allowing the facile replacement of one fluorine in C2F4 with hydrogen. 相似文献
27.
Carolyn Puglisi Renata Ristic Jamie Saint Kerry Wilkinson 《Molecules (Basel, Switzerland)》2022,27(22)
Where vineyard exposure to bushfire smoke cannot be avoided or prevented, grape and wine producers need strategies to transform smoke-affected juice and wine into saleable product. This study evaluated the potential for spinning cone column (SCC) distillation to be used for the remediation of ‘smoke taint’. Compositional analysis of ‘stripped wine’ and condensate collected during SCC treatment of two smoke-tainted red wines indicated limited, if any, removal of volatile phenols, while their non-volatile glycoconjugates were concentrated due to water and ethanol removal. Together with the removal of desirable volatile aroma compounds, this enhanced the perception of smoke-related sensory attributes; i.e., smoke taint intensified. Stripped wines also became increasingly sour and salty as ethanol (and water) were progressively removed. A preliminary juice remediation trial yielded more promising results. While clarification, heating, evaporation, deionization and fermentation processes applied to smoke-tainted white juice gave ≤3 µg/L changes in volatile phenol concentrations, SCC distillation of smoke-tainted red juice increased the volatile phenol content of condensate (in some cases by 3- to 4-fold). Deionization of the resulting condensate removed 75 µg/L of volatile phenols, but fermentation of reconstituted juice increased volatile phenol concentrations again, presumably due to yeast metabolism of glycoconjugate precursors. Research findings suggest SCC distillation alone cannot remediate smoke taint, but used in combination with adsorbents, SCC may offer a novel remediation strategy, especially for tainted juice. 相似文献
28.
Using recently developed techniques for calculating the effective index of refraction for off-axis propagation in Ti : LiNbO3 waveguides and extraordinary ray tracing in uniaxial crystals we demonstrate numerically and define anisotropic aberrations and focal lengths in planar geodesic lenses for on-axis and off-axis wave propagation. 相似文献
29.
30.
Kerry Wilkinson Renata Ristic Imogen McNamara Beth Loveys WenWen Jiang Mark Krstic 《Molecules (Basel, Switzerland)》2021,26(24)
It has been well established that bushfire/wildfire smoke can taint grapes (and therefore wine), depending on the timing and duration of exposure, but the risk of smoke contamination from stubble burning (a practice employed by some grain growers to prepare farmland for sowing) has not yet been established. This study exposed excised bunches of grapes to smoke from combustion of barley straw and pea stubble windrows to investigate the potential for stubble burning to elicit smoke taint. Increased levels of volatile phenols (i.e., chemical markers of smoke taint) were detected in grapes exposed to barley straw smoke (relative to control grapes), with smoke density and the duration of smoke exposure influencing grape volatile phenols. However, the sensory panel did not perceive wine made from grapes exposed to low-density smoke to be tainted, despite the presence of low levels of syringol providing compositional evidence of smoke exposure. During the pea stubble burn, grapes positioned amongst the burning windrows or on the edge of the pea paddock were exposed to smoke for ~15–20 and 30–45 min, respectively, but this only resulted in 1 µg/kg differences in the cresol and/or syringol concentrations of smoke-affected grapes (and 1 µg/L differences for wine), relative to controls. A small, but significant increase in the intensity of smoke aroma and burnt rubber flavor of wine made from the grapes positioned amongst the burning pea stubble windrows provided the only sensory evidence of any smoke taint. As such, had vineyards been located immediately downwind from the pea stubble burn, it is unlikely that there would have been any smoke contamination of unharvested grapes. 相似文献