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A method of studying a non-equilibrium x-ray laser plasma is developed by extending the existing one-dimensional similarity equations to the case of two-dimensional plasma study in the directions perpendicular to the slab and along a focal line.With this method the characteristics of pre-plasma are optimized for transient neon-like Cr x-ray laser.It is found that when the duration and the intensity of 1.053 μm pre-pulse are 1.2 ns and 6.5 TW/cm2 respectively with a delay time of 1.5 ns,the temperature and the temperature discrepancy each approach a proper state,which will provide a uniform distribution of properly ionized neon-like Cr ions before the arrival of pumping pulse. 相似文献
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A slope-based decoupling algorithm to simultaneously control dual deformable mirrors in a woofer–tweeter adaptive optics system 下载免费PDF全文
We propose a slope-based decoupling algorithm to simultaneously control the dual deformable mirrors(DMs) in a woofer–tweeter adaptive optics system. This algorithm can directly use the woofer's response matrix measured from a Shack–Hartmann wave-front sensor to construct a slope-based orthogonal basis, and then selectively distribute the largeamplitude low-order aberration to woofer DM and the remaining aberration to tweeter DM through the slope-based orthogonal basis. At the same moment, in order to avoid the two DMs generating opposite compensation, a constraint matrix used to reset tweeter control vector is convenient to be calculated with the slope-based orthogonal basis. Numeral simulation demonstrates that this algorithm has a good performance to control the adaptive optics system with dual DMs simultaneously. Compared with the typical decoupling algorithm, this algorithm can take full use of the compensation ability of woofer DM and release the stroke of tweeter DM to compensate high-order aberration. More importantly, it does not need to measure the accurate shape of tweeter's influence function and keeps better performance of restraining the coupling error with the continuous-dynamic aberration. 相似文献
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将直觉模糊软集的概念与半环理论相结合,给出了半环的一种有边界值的直觉模糊软h-左理想的概念,对其部分性质进行了探讨,并利用有边界值的直觉模糊软h-左理想,对h-左正则半环的刻画问题进行了讨论. 相似文献
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This work focuses on the characteristics of the Rayleigh-Taylor Instability (RTI) of the interfaces formed by two semi-infinitely distributed fluids and one interlayer. In consideration of the coupling effects between the interfaces, the expression of the growth rate is obtained. The result reveals that the instability growth rate depends on the density and thickness of the interlayer. It is found that /f the interlayer thickness is less than 0.6 times of the disturbing wavelength, the coupling effects should be considered. 相似文献
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结构模型设计竞赛与土木工程专业教学改革 总被引:1,自引:0,他引:1
介绍了结构模型设计制作的基本过程,阐述了开展模型竞赛与土木工程专业应用型人才体系的关系.在此基础上,从强化实践力学-结构课程体系、改革课程内容、设置开放性实践环节等方面阐述了构建创新性、应用型人才培养体系的思路,并通过教学实例加以分析. 相似文献
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