Design and Performance Analysis of High Speed Optical Binary Code Converter using Micro-Ring Resonator

The present paper describes various attractive logical code conversions using optical micro-ring resonator. We have proposed an all-optical switching activity using silicon waveguide based micro-ring resonator under low-power operation through two-photon absorption effect. The different properties of the optical switch are analyzed through numerical simulation. We have also proposed and described all-optical binary-to-octal, binary-coded-decimal-to-excess-3 and binary-to-Gray-code converter circuits by this proposed architecture. Numerical simulation results for code conversion verifying the proposed methods are given in this paper. We identify a combination of feasible ring radius and detuning through numerical simulation that allows analyzing the system performance of the scheme.     

Dynamical analysis and experimental verification of valley current controlled buck converter

The dynamical behaviours of valley current controlled buck converter are studied by establishing its corresponding discrete iterative map model in this paper. Time-domain waveforms and phase portraits of valley current controlled buck converter are obtained by Runge--Kutta algorithm through a piecewise smooth switching model. The research results indicate that the valley current controlled buck converter exhibits rich nonlinear phenomena, and it has routes to chaos through period-doubling bifurcation and border-collision bifurcation in a wide parameter range. Interesting inverse nonlinear behaviours compared with peak current controlled buck converter are observed in the valley current controlled buck converter. Analysis and simulation results are verified by experimental results.     

用四波混频系统通过单层和多层畸变介质传输图象

本文讨论了一种用四波混频系统通过单层和多层薄畸变介质传输图象的方法,并给出了单层和两层畸变介质时的消畸变实验结果。理论分析与实验结果是一致的。这种方法为解决通过厚畸变介质传输图象的问题提供了可能的途径。 关键词：     

增益控制EDFA的原理、性能与系统实验

本文首先对增益控制EDFA进行了理论分析,并用环形腔法实现,检测了这种放大器在不同谐振波长和环形胜损耗条件下的特性,对实验现象进行了分析,并用该放大器进行了系统实验.     

竖直多孔介质同心套管内混合对流的研究

在简要综述研究现状的基础上，本文通过量级分析导出了影响竖直多孔介质同心套管内混合对流的无量纲参数，提出厂简化混合对流为受迫对流的判据，分析计算了非达西效应的影响，并与实验研究的结果进行了对比。／ＲｅｐａｎｄＨ／ｄｐ，ｗｈｉｃｈｇｏｖｅｒｎｔｈｅｍｉｘｅｄｃｏｎｖｅｃｔｉｏｎｉｎａｖｅｒｔｉｃａｌａｎｎｕｌｕｓｆｉｌｌｅｄｗｉｔｈｐｏｒｏｕｓｍｅｄｉａ，ａｒｅｄｅｄｕｃｅｄｔｈｒｏｕｇｈｄｉｍｅｎｓｉｏｎａｌａｎａｌｙｓｉｓ，ａｎｄｔｈｅｃｒｉｔｅｒｉａｆｏｒｍｉｘｅｄｃｏｎｖｅｃｔｉｏｎｉｓｅｓｔａｂｉｌｉｓｈｅｄｔｈｅｒｅｂｙ．Ｔｈｅｍｉｘｅｄｃａｌｃｕｌａｔｅｄｒｅｓｕｌｔｓｆｏｒｄｅｔｅｃｔｉｎｇｔｈｅｎｏｎ－Ｄａｒｃｙｅｆｆｅｃｔｓａｒｅｄｉｓｃｕｓｓｅｄ．Ｔｈｅｐｒｅｄｉｃｔｅｄｒｅｓｕｌｔｓａｇｒｅｅｗｅｌｌｗｉｔｈｔｈｅｅｘｐｅｒｉｍｅｎｔｓ．Ｋｅｙｗｏｒｄｓ：ｐｏｒｏｕｓｍｅｄｉａ；ｍｉｘｅｄｃｏｎｖｅｃｔｉｏｎ     

Magnetohydrodynamic turbulent flows: Existence results

In this paper we provide a detailed investigation of the problem of existence of solutions to the stochastic magnetohydrodynamic equations which describe the motion of turbulent particles of fluids in a magnetic field. The results are proved through a delicate combination of Galerkin approximation scheme with some deep compactness results of analytic and probabilistic nature.     

The biological effectiveness of X-ray radiation

Using Monte Carlo simulation, this paper explores the passing of gamma radiation through biological thin layers. In radiobiological experiments, this method of investigation simulates the conditions for determining the relative biological effectiveness (RBE). X-ray spectra from X-ray tubes, which are often used in such experiments, are simulated in this paper. The RBE is determined as the ratio of absorption doses, when the number of ionization events is equal for gamma and X-ray radiation. The results of the estimates are represented for the modeling of X-ray spectra in the case of irradiation of biological layers of different thicknesses.     

Modeling and Analyses of Vias in Multilayered Boards with the Aid of Look-Up Tables

Vias passing through multilayered boards are studied by using microwave network theory and antenna theory. By means of suitable electromagnetic simulations, the propagation parameters of vias are computed accurately. The results are then organized into a form of a look-up table so that some interpolation algorithm could be used. Compared with the direct numerical simulation, this kind of process could save much time and space resource, and its results are fairly good as shown in this paper. It has already been used in a CAD software.     

Impulsive dynamics of a flexible arm: analytical and numerical solutions

Impulsive motion of a flexible, beam-like arm is investigated in this paper. The arm is attached to an inertial system through a revolute joint. A modelling approach and an analytical solution are outlined for this problem. Comparisons are presented between analytical and numerical solutions. Finite motion due to an impulsive event is also considered by simulations, and the results are compared to experimental data.     

Influence of Randomly Varying Birefringence on Soliton Switching

In this paper, the effects of the randomly varying birefringence on soliton switching in the twin-core fiber are discussed through a nonlinear coupling equation , some novel and useful results on soliton switching are obtained.     

A fuzzy finite element procedure for the calculation of uncertain frequency response functions of damped structures: Part 2—Numerical case studies

This work introduces a numerical algorithm to calculate frequency response functions of damped finite element models with fuzzy uncertain parameters. Part 1 of this paper focusses on the numerical procedure for the solution of the underlying interval finite element problem, based on the undamped procedure and the principle of Rayleigh damping. Part 2 of this paper illustrates the applicability of the methodology through four case studies. The concepts of the interval and the fuzzy finite element frequency response function analysis are illustrated for different types of uncertainties. The obtained results are compared with the results of Monte Carlo simulations.     

静态应力作用下预测光学系统性能的计算方法

本文通过计算预测光学性能的方法表征在光学系统组装和外界环境因素影响下的光学系统灵敏度。该方法即通过调制传递函数来表征静态机械应力对光学物镜性能的影响。采用光学干涉仪对经过加工、组装且存在机械应力的光学物镜进行测试,并比较实验调制传递函数与计算模拟分析的调制传递函数。结果表明,计算结果与实验结果相符,证实了本文方法的有效性。     

一种基于液晶技术的可调谐滤波器研究

首先介绍了一种新型液晶可调谐滤波器(LCTF)的基本结构,分析了其工作原理,然后用琼斯矩阵理论推导了其光传输矩阵,理论上得出了其幅度、相位电压调制范围,并对其进行数值分析。最后实验上制作了该器件,实验结果与理论分析相符。     

Ozone generation in gas flow enhanced hollow needle to plate electrical discharge in air

The results of studies of ozone production for DC electrical discharge in air at atmospheric pressure with a single hollow needle to plate electrode configuration enhanced by the flow of air through the needle for both polarities of the needle, different airflow rates and currents are given in this paper.     

Image of rays that have passed through a stationary phase-distorting medium

Images obtained through stationary phase-distorting media are investigated in this paper. It is shown that the quality of the recorded images depends on the conditions of light beam limitation. Qualitative results and quantitative dependences of the contrast of the image being recorded through a phase-distorting medium on the magnitude of the aperture orifice are presented. A method is proposed for improving the image quality of objects being recorded through smooth phase-distorting stationary media, which is efficient for both coherent and noncoherent exposure.     

松散沉积物的有效密度及其声压反射损失

本文将液型介质向松散的沙质沉积物中延拓,获得了松散沙质沉积物中的有效密度表达式,利用该表达式计算了松散的沙质沉积物表面上的平面声波的反射系数的模,并与实验数据进行比较,理论与实验相符合。     

A Novel Moment Approach for Calculation of the Perron–Frobenius Spectrum

The spectral properties of the Perron–Frobenius operator of the one-dimensional maps are studied by using the moment. In this paper we make an investigation into the properties of self-similar measures related to the theory of orthogonal polynomials. Numerical investigation of a particular family of maps shows that the spectrum generates the invariant measure. Analytical considerations generalize the results to a broader class of the maps. Some examples of this method are presented through out the paper.     

A flexible 3D profilometry based on fringe contrast analysis

This paper proposed a flexible 3D profilometry based on fringe contrast analysis. A series of sinusoidal fringes are projected on the surface of the testing object that is laid in front of the imaging plane of the fringes, and captured through a beam splitter by a CCD camera in the same direction as the axis of the projection. After the fringe contrast obtained using phase-shifting technique, the height of the object can be restored through searching the look-up table of the contrast and the height. In the measurement process, we only need to capture fringe patterns in one position, without changing the imaging plane of the fringes, so it is faster and more convenient than the existing method based on fringe contrast analysis. Our system is simple and flexible by reason of no special devices used. In this paper, the principle of this method, the setup of the measurement system and primary experiment results are given. The experimental results prove this method can restore the height of the complex object accurately and effectively.     

Analysis of equation of state and thermodynamic functions for trans-decahydronaphthalene up to 200~MPa and 446~K

This paper develops a modified Tait equation of state(EOS) for trans-decahydronaphthalene with four parameters A,B,V0 and P0 being treated as linear functions of temperature.The coefficients contained in these functions are determined through fitting the experimental compression data in the literature between 293 K and 446 K and at pressures from 10 to 200 MPa.Expressions for the thermal expansivity,isothermal compressibility and thermodynamic quantities are deduced and the numerical results are analytically derived.The numerical results show that the precision of the modified Tait EOS developed in this paper is superior to the EOS in the literature.     

Propagation of elegant Hermite cosine Gaussian laser beams

In this paper, a more generalized beam containing an elegant Hermite Gaussian beam and a cosine Gaussian beam, which is called elegant Hermite cosine Gaussian (EHcoG) beam, is introduced and studied. The propagation properties of the EHcoG laser beams through a first-order paraxial optical system are demonstrated analytically and numerically. The recurrence propagation equations of the EHcoG beams through a first-order paraxial optical system with and without aperture are derived, from which the analytical propagation expression for EHcoG beams of any order can be obtained by means of the recursive procedures. The validity of the analytical results is confirmed by the numerical results.