Theoretical investigation of a backward wave oscillator

From the linear Vlasov equation,the theoretical investigation on relativistic backward wave osciUator is performed.The relationship between the microwave power and the guiding magnetic field,which accords with the results of the particle simulation and experiments,is deduced.     

多光子偏振态与单光子高维空间态之间的相互变换及其应用

基于一种特殊的控制非门,实现多光子偏振态与单光子空间高维态之间的相互变换,使得对多光子偏振态的操作可以通过对单光子的操作来完成,由此可以实现任意多光子正定算符值测量和多光子任意幺正操作.这种实现方式是以一定概率完成的,但其效率要优于此前的方案,在目前的实验条件下是可行的. 关键词： 单光子空间态 特殊控制非门 线性光学多端口干涉仪     

Application of quantitative structure-activity relationship to the determination of binding constant based on fluorescence quenching

Quantitative structure-activity relationship (QSAR) model was used to predict and explain binding constant (log K) determined by fluorescence quenching. This method allowed us to predict binding constants of a variety of compounds with human serum albumin (HSA) based on their structures alone. Stepwise multiple linear regression (MLR) and nonlinear radial basis function neural network (RBFNN) were performed to build the models. The statistical parameters provided by the MLR model (R²=0.8521, RMS=0.2678) indicated satisfactory stability and predictive ability while the RBFNN predictive ability is somewhat superior (R²=0.9245, RMS=0.1736). The proposed models were used to predict the binding constants of two bioactive components in traditional Chinese medicines (isoimperatorin and chrysophanol) whose experimental results were obtained in our laboratory and the predicted results were in good agreement with the experimental results. This QSAR approach can contribute to a better understanding of structural factors of the compounds responsible for drug-protein interactions, and can be useful in predicting the binding constants of other compounds.     

多元相控聚焦探测器的方向特性

研究了多元线性阵列探测器的主频、阵元个数和阵元间距对探测器方向性的影响.实验结果表明,采用主频为2～5 MHz,阵元数为5～15,阵元间距为0.3～0.9 mm的多元线性阵列探测器,其方向性好,将有利于光声信号的探测与成像.     

反射式Sagnac干涉光纤电流互感器的传感头误差研究

阐述了反射式Sagnac干涉型电流传感器的原理,对Sagnac型光纤电流传感器进行了深入的理论研究,建立了完整的系统理论模型。采用偏振系统的Jones矩阵对反射式Sagnac干涉型电流传感器的偏振误差进行了研究,并对光纤传感头中的线性双折射、圆双折射对测量准确度的影响进行了模拟分析,从理论上得到了反映影响规律的曲线。仿...     

Constitutive theories for nonlocal micropolar continua with implicity and with multiple interactions

In this paper the constitutive theory for nonlocal micropolar continua which was proposed by A. C. Eringen is extended to the cases for nonlocal micropolar continua with implicity and with multiple interactions. Here nonlocal micropolar thermoelastic solids with implicity and with multiple interactions are cited as instances to illustrate the procedure for the establishment of their constitutive theories as well as two relevant theorems concerning the constitutive theories for those solids are given.     

检测输油管道实际油垢样品的实验研究

在石蜡实验基础上,本工作运用γ射线散射法检测油垢样品进行对比实验研究,并在进一步的实验研究中探讨康普顿散射光子数与油垢样品厚度之间的线性关系．发现放射源与油垢样品之间的距离与提高线性度有很大关系．本实验测得最佳线性相关系数平方值为0．9871,测量精度为0．671mm．     

模糊线性规划的对称曲边岭形模型

用扩张原理,对模糊线性规划中参数为对称等腰岭形的情形建立了相应的模型化公式,并把这类问题转化为非线性规划求解     

检测含任意项特殊逻辑函数的图形方法

线性函数、冗余特殊、自反函数、自双反函数等特殊逻辑函数在电路设计中具有独特的优点.从特殊逻辑函数的定义出发,提出了基于K图检测含任意项线性函数、冗余函数的方法及基于分解图检测含任意项自反函数、自双反函数的方法,并举例说明了具体检测过程.应用结果表明,该图形方法具有直观,便捷等特点.