纳米TiO_2薄膜的低温等离子体制备技术

以四氯化钛为源物质,氩气为载气,氧气为反应气体,利用低温等离子体增强化学气相沉积在硅基表面制备出了TiO2薄膜。使用场发射扫描电子显微镜、X射线衍射仪等检测分析表征TiO2薄膜的性能与性质,并探讨了工艺条件如基片材料、沉积时间和基片温度对薄膜性能的影响。结果表明:制备的薄膜表面光滑均匀,结构致密,最小晶粒尺寸约15 nm;薄膜的晶型主要依赖于沉积温度,低于300℃沉积的薄膜是无定形的,300℃之上沉积的薄膜是锐钛矿结构。     

Theory of Z-scan technique using Gaussian-Bessel beams with a phase object

This paper reports the theoretical study of combining Z-scan technique with Gauss-Bessel (GB) beams beside a phase object (PO) to measure the third-order nonlinear susceptibility components.By using this method,the sign of refractive index which depends on the shape of the close aperture Z-scan curve can be easily determined.Meanwhile,the magnitude of nonlinear coefficients can also be deduced by theoretical fit.The proposed method is advantageous for high sensitivity and imposes a lower stress in the cases of fragile materials,since small pulse energy is enough for the measurement of nonlinear coefficients.Predictions of the models are compared with Gaussian Z-scan measurement and GB Z-scan measurement.By using GB beams with a PO,the sensitivity of Z-scan measurements is found to be a factor of over 60 times greater than for Gaussian beams and 2 times greater than for Gaussian-Bessel beams.     

基于改进模糊神经网络的变电站电压无功优化控制

变电站电压无功控制具有非线性调制和耦合度强的特征,很难创建精准的数学模型,传统的电压无功控制方法没有考虑到调整分接头对电压无功带来的影响,从而造成了设备多次动作等问题。提出了一种基于改进粒子群的模糊神经网络算法,建立了一种多任务优化的变电站无功控制模型。最后对优化后的电压无功控制模型进行了系统仿真。在缺乏精确的系统数学模型的情况下,可以实现相对精确的控制,且设计简单、鲁棒性好。     

Design and Application of a Near Field Microwave Antenna for the Spin Control of Nitrogen-Vacancy Centers

Controlled manipulation of the electron spin by means of a microwave field is investigated. The near magnetic field generated by a copper wire antenna is measured experimentally and simulated theoretically, and the optimum antenna length and position are obtained. By measuring the change in the fluorescence of nitrogen-vacancy （N-V） centers in diamond after excitation with a 532 nm continuous wave laser at room temperature, it is verified that the spin of the N-V center can be effectively controlled by the microwave field.     

基于CANopen的自动化船舶监控系统

针对目前船舶监控系统的应用需求,基于CAN现场总线,采用CANopen船舶应用协议,开发了一套船舶监控自动化系统。该系统由上位监控主站和下位数据采集从站组成。上位监控主站是整个系统的控制中心,接收并处理CAN总线上监控从站发送过来的数据,完成对各个被测对象的监管。测试结果表明,该系统可以实时、稳定地实现对船舶各舱液位、温度、压力等监控对象数据的接收、分析、处理、显示、报警等功能,在船舶监控自动化领域有较高的应用价值。     

基于路径建模的大理州居民幸福感研究

基于路径建模方法及大理白族自治州12个县市问卷调查数据,建立大理州居民幸福感结构方程模型,对大理州居民幸福感进行测评分析.研究对幸福感测评体系建设有一定指导意义,进一步探讨了提高居民幸福感的政策建议.     

黄河河道冰水情定点连续自动检测及数据分析

根据黄河中上游流域冰水情监测以及预防凌汛灾害的需求,设计了一种适合黄河河道的冰水情自动测报系统.该系统由基于空气、冰与水电阻特性差异的冰层厚度传感器、DS18B20的温度梯度传感器以及智能处理仪构成.采用该系统在内蒙托克托县黄河河道进行了黄河封冻期河道冰层厚度连续监测试验,获取了大量的现场实测数据,对采样数据进行分析,提出了判别冰层厚度的平均滤波算法,实现了对冰层生消变化全过程的自动监测.     

Multiquadric 拟插值对高阶导数逼近的稳定性分析

基于样本数据来数值模拟函数的高阶导数是数值逼近中遇到的一类重要而且基本的问题, 差商方法是数值微分的传统方法. 但是在实际问题的求解中, 它表现出强烈的不稳定性. 在实际应用中, 由于差商计算的不稳定性, 它仅能用来模拟函数的低阶导数. 为了更好地模拟函数的高阶导数, 本文利用multiquadric 拟插值提出了一种新的方法. 并将multiquadric 拟插值方法模拟函数导数的稳定性与传统差商方法所得结果进行了对比. 数值例子很好地验证了本文的理论. 从理论论证和数值例子比较来看, multiquadric 拟插值方法比差商方法更为稳定. 这个性质也表明, 基于散乱甚至有干扰的数据, 在逼近函数的高阶导数时, multiquadric 拟插值方法是一个有效的工具.     

SOME PROPERTIES OF HOLOMORPHIC CLIFFORDIAN FUNCTIONS IN COMPLEX CLIFFORD ANALYSIS

In this article, we mainly develop the foundation of a new function theory of several complex variables with values in a complex Clifford algebra defined on some subdomains of Cn+1, so-called complex holomorphic Cliffordian functions. We define the complex holomorphic Cliffordian functions, study polynomial and singular solutions of the equation D△mf=0, obtain the integral representation formula for the complex holomorphic Cliffordian functions with values in a complex Clifford algebra defined on some submanifolds of Cn+1, deduce the Taylor expansion and the Laurent expansion for them and prove an invariance under an action of Lie group for them.     

单层钨丝阵Z箍缩内爆不稳定性特征实验研究

基于激光阴影像,研究了直径为8 mm的钨丝阵在滞止阶段的不稳定性发展。实验结果表明,在消融阶段早期,不稳定性扰动的主导波长为0.2 mm。在内爆后期和滞止阶段,不稳定主导波长迅速向长波长方向发展。在功率峰值前后,扭曲不稳定性特征开始出现,在滞止等离子体柱达到最小收缩直径后,辐射功率出现了明显下降。