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介绍了Lambert W函数的代数及图像性质,如该函数的级数展开式、微分及函数在复平面的图像等。总结了其在数学、物理、化学和生物等领域的应用情况。 相似文献
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陈碧芳 《湖州师范学院学报》2003,25(6):65-67
从光的波粒二象性出发，分别根据光波的能量守恒定律及光子出现的概率密度与电场强度的平方成正比，推导出光吸收的朗伯定律。 相似文献
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为了得到太阳能电池的最佳工作状态,需要对其各参数进行求解.太阳能电池等效电路模型为电压-电流的隐式方程,无法采用常规方法得到解决.通过引入Lambert W函数,将电流表示成电压的显式方程,并编写程序与牛顿迭代法进行对比,证明了此方法的正确性与精确性.模拟仿真发现串联电阻与并联电阻对太阳能电池的伏安特性和输出功率等特性曲线有较大影响,且影响效果各不相同,但共同影响着输出电压与功率等参数. 相似文献
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A new approach for observer-based feedback control of time-delay systems is developed. Time-delays in systems lead to characteristic equations of infinite dimension, making the systems difficult to control with classical control methods. In this paper, a recently developed approach, based on the Lambert W function, is used to address this difficulty by designing an observer-based state feedback controller via assignment of eigenvalues. The designed observer provides estimation of the state, which converges asymptotically to the actual state, and is then used for state feedback control. The feedback controller and the observer take simple linear forms and, thus, are easy to implement when compared to nonlinear methods. This new approach is applied, for illustration, to the control of a diesel engine to achieve improvement in fuel efficiency and reduction in emissions. The simulation results show excellent closed-loop performance. 相似文献
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Alexandra Lawrie 《Media History》2013,19(3):279-291
This article examines the content and impact of a series of BBC lecture courses broadcast in the early 1930s. The Group Listening Scheme was established in 1928: experts working in a variety of fields were invited to broadcasts a series of evening lectures. Adults across the country were encouraged to gather for the lectures and stay on afterwards to discuss them. ‘The Changing World’ consisted of half-hour talks over six evenings a week during a six-month period. The broadcasts amounted to a two-term syllabus, with 24 talks devoted to each of the six themes (the modern dilemma, industry and trade, literature and art, science, the modern state, and education and leisure). This article will sample some of these broadcasts and explore the listener response to the series in order to reach an understanding of the BBC’s achievements in adult education during the interwar period. 相似文献
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