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Using a scanning tunneling microscope, quantum dots with diameters of order 25 Å have been fabricated on the cleaved InSb (110) surface in UHV. Both In and Sb atoms were clearly resolved on the cleaved surface. 相似文献
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Quan Xiang WE Xia LIU Yan Ping SHI 《中国化学快报》2005,16(11):1477-1480
A novel dimeric eremophilane, ligulolide B, was isolated from the alcoholic extract of the whole plant of Ligularia virgaurea spp. oligocephala. The structure was elucidated by various spectroscopic methods including intensive 2D NMR techniques (^1H-^1H COSY, gHMQC, gHMBC and ^1H-^1H NOESY) and HR-ESI-MS. 相似文献
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In the study of nonlinear physical systems, one encounters apparently random or chaotic behavior, although the systems may
be completely deterministic. Applying techniques from symbolic dynamics to maps of the interval, we compute two measures of
chaotic behavior commonly employed in dynamical systems theory: the topological and metric entropies. For the quadratic logistic
equation, we find that the metric entropy converges very slowly in comparison to maps which are strictly hyperbolic. The effects
of finite precision arithmetric and external noise on chaotic behavior are characterized with the symbolic dynamics entropies.
Finally, we discuss the relationship of these measures of chaos to algorithmic complexity, and use algorithmic information
theory as a framework to discuss the construction of models for chaotic dynamics. 相似文献
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Hanczyc MM Toyota T Ikegami T Packard N Sugawara T 《Journal of the American Chemical Society》2007,129(30):9386-9391
Fatty acids have been investigated as boundary structures to construct artificial cells due to their dynamic properties and phase transitions. Here we have explored the possibility that fatty acid systems also demonstrate movement. An oil phase was loaded with a fatty acid anhydride precursor and introduced to an aqueous fatty acid micelle solution. The oil droplets showed autonomous, sustained movement through the aqueous media. Internal convection created a positive feedback loop, and the movement of the oil droplet was sustained as convection drove fresh precursor to the surface to become hydrolyzed. As the system progressed, more surfactant was produced and some of the oil droplets transformed into supramolecular aggregates resembling multilamellar vesicles. The oil droplets also moved directionally within chemical gradients and exhibited a type of chemotaxis. 相似文献