PN结内建电势是电源吗

文献[1]作者认为“效应“一文是错误的,是曲解了经曲光伏理论,并认为经典光伏理论是“无暇可击“的,不用修正的观点,本文根据微分欧姆定律,证明了经典光伏理论存在严重错误,必须修正.     

光激光拾自谐振传感器的光学特性及优化设计

建立了光激、光拾自谐振多晶硅微机械传感器的多层膜系模型,利用该模型对传感器的光学特性进行了理论分析,并对传感器谐振微梁厚度和空腔高度进行了优化.     

A note on the functional law of iterated logarithm for maxima of Gaussian sequences

Let {X_n, n ≥ 1} be a real-valued stationary Gaussian sequence with mean zero and variance one. Let M_n = max{X_t, i ≤ n} and H_n(t) = (M_[nt] ? b_n)a_n^?1 be the maximum resp. the properly normalised maximum process, where $\text{c}{}_{\mathrm{n}}\text{= (2}\text{log}\text{n)}{}^{\mathrm{<mtext>1</mtext><mtext>2</mtext>}}$, $\text{a}{}_{\mathrm{n}}\text{=}\text{(}\text{log log}\text{n)}\text{c}{}_{\mathrm{n}}$ and $\text{b}{}_{\mathrm{n}}\text{= c}{}_{\mathrm{n}}\text{?}\text{1}\text{2}\text{(}\text{log}\text{(4π}\text{log}\text{n))}\text{c}{}_{\mathrm{n}}$. We characterize the almost sure limit functions of (H_n)_n≥3 in the set of non-negative, non-decreasing, right-continuous, real-valued functions on (0, ∞), if r(n) (log n)^3?Δ = O(1) for all Δ > 0 or if r(n) (log n)^2?Δ = O(1) for all Δ > 0 and r(n) convex and fulfills another regularity condition, where r(n) is the correlation function of the Gaussian sequence.     

复通菲涅耳光学相关滤波器

本文介绍了一种同区复通菲涅耳全息滤波器的制备方法,井基于此种滤波器实现了多个模式的光学相关识别。文中给出了同区复通菲涅耳全息滤波器的理论分析,并给出了相关识别的实验结果。     

Application Value of Slow Decay Behavior of Energy Density Excited by Electromagnetic Pulses

By comparing the radiated energy densities excited by the continuous wave (CW), the sinusoidal pulse, the Gaussian pulse and the rectangular pulse respectively with the same energy, it is shown that the pulses are not more efficient than CW in the energy transmission. For the sinusoidal pulse and the CW, the radiated energy densities are the same in far zone. The radiated energy density of the Gaussian pulse is equal to the one of CW in far zone when the pulse width equals 1/2 of the CWs period T₀. The energy transmission of pulse is more efficient only in the case of 0/2. For the rectangular pulse, the radiated energy density is equal to the one of CW in far zone when the maximum of frequency spectrum is 10f₀ (f₀=1/T₀) and the pulse width is T₀. The numerical results and theoretical analysis in this paper show that the application value of the slow decay behavior of the energy density excited by electromagnetic pulses is limited.     

聚合物分散液晶透明投影屏幕成像原理研究

对施加电场时呈透明态(ON态)的聚合物分散液晶(PDLC)膜用作透明投影屏幕的原理给出定性与定量的描述和分析。在PDLC-ON态测试样品的透光率随入射角变化曲线,发现S偏振光透光率不受PDLC膜的影响,P偏振光透光率随入射角变化受PDLC膜的影响衰减严重,发生散射。建立了P偏振光透光率随入射角度变化物理模型,给出了P偏振光的透光率的表达式。模拟计算得出理论曲线,与实验曲线相符合,进而解释了PDLC-ON态作为透明投影屏幕的成像原理。     

谐振腔模式的特征向量法快速计算分析

用特征向量法模拟较大菲涅耳数激光谐振腔时,采用梯形积分法计算效率较低。为了解决这一问题,通过理论分析谐振腔输出模式的空间带宽积,确定计算传输矩阵时最少的取样点数。采用高斯积分法计算传输矩阵,该方法在保证啁啾函数计算精度的同时使传输矩阵尺寸满足最少取样要求。通过对菲涅耳数为10的方形镜平凹谐振腔进行数值模拟可知,传统方法的传输矩阵尺寸为1000010000,谐振腔特征模式的计算时间为412.47s,本文中的计算方法需要的传输矩阵尺寸为36003600,计算时间为51.34s。结果表明,本文中的计算方法能大幅度提高特征向量法的计算效率,同时减少计算机内存的消耗。     

Imprecise stochastic processes in discrete time: global models,imprecise Markov chains,and ergodic theorems

We justify and discuss expressions for joint lower and upper expectations in imprecise probability trees, in terms of the sub- and supermartingales that can be associated with such trees. These imprecise probability trees can be seen as discrete-time stochastic processes with finite state sets and transition probabilities that are imprecise, in the sense that they are only known to belong to some convex closed set of probability measures. We derive various properties for their joint lower and upper expectations, and in particular a law of iterated expectations. We then focus on the special case of imprecise Markov chains, investigate their Markov and stationarity properties, and use these, by way of an example, to derive a system of non-linear equations for lower and upper expected transition and return times. Most importantly, we prove a game-theoretic version of the strong law of large numbers for submartingale differences in imprecise probability trees, and use this to derive point-wise ergodic theorems for imprecise Markov chains.     

基于Fresnel透镜的激光车灯的设计与加工

激光车灯对比于LED车灯,具有能耗小、体积小、亮度高等优点,是汽车车灯发展的新方向。提出了一种激光车灯的完整的设计思路。光源采用激光二极管激发荧光片得到白光。通过搭建光学检测平台研究激光驱动白光光源的光学特性,通过机器视觉的方法研究荧光片前后光斑的形状和尺寸的变化,从而精确地建立光源的仿真模型,为后续的光学设计提供理论依据。通过非成像光学设计方法,设计了Fresnel透镜实现了对激光的整形,并利用超精密车削实现透镜的加工。完成了车灯的设计和组装,并通过光学仿真和光学实验验证了设计的正确性。     

The Law of Mixtures method for multivariate calibration

The Law of Mixtures (LM) method is a new so-called topological method for multivariate calibration. It is shown to be a very good method to predict the response for new objects that are inside the convex hull determined by the calibration data set. A method is also proposed for those that are outside the convex hull.