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运用分子动力学模拟,研究了腺苷酸(激动剂)与A2AAR腺苷受体蛋白的相互作用和配体结合诱导的蛋白动力学变化.识别了与腺苷酸结合力强于0.5 kcal/mol的关键基团:A632.61,I662.64, V843.32, L853.33, T883.36, F1685.29, M1775.38, L2496.51 相似文献
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轴流压气机旋转失速的预示研究 总被引:1,自引:0,他引:1
大量的研究表明,旋转失速现象的发生不仅与压气机工作状态的气动参数有关,而且与压气机几何参数有直接关系。本文的目的是用实验的方法找出影响压气机旋转失速发生的主要因素,通过对实验数据分析研究获得判别失速发生的准则。文中首先对十个低速转子进行试验,其主要几何参数为稠度τ=1.5,轮毂比为0.815,安装角γ分別为45°和60°,弯角θ分别为0°,15°,34°,45°,60°。试验表明:具有各种不同几何参数(弯 相似文献
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Non-axisymmetric wake impact experiments were carried out after the best exciting frequency for a low speed axial compressor had been found by axisymmetric wake impact experiments. When the number and circumferential distribution of inlet guide vanes (IGV) are logical, the wakes of non-axisymmetric IGVs can exert beneficial unsteady exciting effect on their downstream rotor flow fields and improve the compressor's performance. In the present paper, four non-axisymmetric wake impact plans were found working better than the axisymmetric wake impact plan. Compared with the base plan, the best non-axisymmetric plan increased the compressor's peak efficiency, and the total pressure rise by 1.1 and 2%, and enhanced the stall margin by 4.4%. The main reason why non-axisymmetric plans worked better than the axisymmetric plan was explained as the change of the unsteady exciting signal arising from IGV wakes. Besides the high-frequency components, the nonaxisymmetric plan generated a beneficial low-frequency square-wave exciting signal and other secondary frequency components. Compared with the axisymmetric plan, multifrequency exciting wakes arising from the non-axisymmetric plans are easier to get coupling relation with complex vortices such as clearance vortices, passage vortices and shedding vortices. 相似文献
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Rapid internal conversion in a symmetric molecule LD 700 studied by means of femtosecond fluorescence depletion
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The rapid internal conversion dynamics at room temperature is
determined by using the femtosecond time-resolved fluorescence
depletion measurements of a complex solvated molecule of LD 700
(rhodamine 700) combined with steady-state absorption and
fluorescence spectroscopy, as well as quantum chemical calculation.
The molecule is excited by a 50fs laser pulse at 400nm which
directly populated the highly excited singlet state, the rapid
internal conversions (ICs) are observed, which leads to the
directional changes of the emission transition moment following
photoexcitation to the highly excited singlet state S5 of LD
700. 相似文献
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