使用虚拟仪器技术的软件工具研究

在计算机技术飞速发展的影响下,虚拟仪器技术经过多年的酝酿、实践、争论和改进,现在已经进入实用的阶段。本文以介绍Ｖｉｓｕａｌ Ｂａｓｉｃ环境下我们自行开发的ＡＴＳ９５软件工具为重点,说明虚拟仪器技术的应用方法。     

A new kind of compound solid-state quasi-optical power combiner

In this paper, a new kind of solid-state quasi-optical power combiner is presented. It consists of two or more singlecavity multiple-device power combiners and a Fabry-Perot cavity. The experimenal results using six Gunn diodes at X-band show that the total output power is higher than 400 mW, the total combining efficiency is as high as 83%, and the frequency stability is better than 10^?5.     

基于卷积神经网络的砂岩数字岩心绝对渗透率计算方法

基于卷积神经网络深度学习理论探讨了砂岩数字岩心绝对渗透率的计算方法和相关的重要影响因素。研究选取了3种具有代表性的砂岩样品包括Bentheimer砂岩、Berea砂岩和Doddington砂岩的数字岩心,比较了采用N-S方程法和孔隙网络模型法计算绝对渗透率的差异性;探讨了对砂岩样品进行切割生成子样品时,3种不同子样品尺寸对绝对渗透率均值和不同方向渗透率分量的影响。在此基础上基于200×200×200尺寸对原砂岩数字岩心进行切割获取子样品,并对全部子样品进行微观渗流模拟计算获得相应的绝对渗透率,建立了用于深度学习的数字岩心子样品数据库。基于该数据库讨论了卷积神经网络系统搭建过程中的关键参数如学习率和丢弃率等的选择方法。训练学习后对测试集子样品进行测试,预测值与真实值差异在5%以内,证明了该方法的有效性。     

基于脉冲幅度的电磁感应装定编码

针对引信电磁感应装定的脉冲间隔编码方式不能有效解决干扰脉冲影响,以及时差测量存在较大误差,提出了电磁感应装定的脉冲幅度编码方式。该编码方式的脉冲周期固定,通过计算相邻脉冲幅度差,即差分信号来表示"0"和"1"的信号来实现数据装定。分析与实验表明:该方式切实可行,实现简单,不需要精确测量时差,并能有效提高抗干扰能力。     

基于三维模型的机加工艺设计技术

为了满足基于模型的定义(model based definition,MBD)的发展需求,提出一种在三维环境下机加工艺设计的方法。通过导入零件设计模型,构建了工艺信息模型,进行工艺路线规划,生成工序模型,最终输出工艺文件,实现了基于三维模型的工艺设计,并提出了3种工艺信息输出的方法。实例分析结果证明:该方法有利于实现CAPP和CAD系统间的信息交流,具有可行性和有效性。     

一种基于QoS的无线Mesh网络DSR路由优化算法

无线Mesh网络(Wireless Mesh Network,简称WMN)是一种新型的高容量、高速率的分布式宽带无线网络,是下一代无线网络的关键技术.在综合考虑带宽、传输拥塞、网络吞吐量等方面因素,将博弈论的思想引入动态源路由(Dynamic Source Routing,简称DSR)算法中,提出一种基于博弈论的DSR路由优化算法,经分析与仿真表明,该路由能有效减小时延,提高数据传输效率,提升网络传输的服务质量(Quality of Service,简称QoS).     

Illuminating Dark Plasmons of Silver Nanoantenna Rings to Enhance Exciton–Plasmon Interactions

The chemical growth of silver nanorings that possess singly twinned crystals and a circular cross section via a reductive reaction solution is reported. The wire and ring diameters of the synthesized nanorings are in the ranges 80–200 nm and 4.5–18.0 μm, respectively. By lighting up the multipolar dark plasmons with slanted illumination, the silver nanoring exhibits unique focused scattering and large local‐field enhancement. We also demonstrate strong exciton–plasmon interactions between a monolayer of CdSe/ZnS semiconductor quantum dots and a single silver antenna‐like nanoring (nanoantenna) at the “hot spots” located at the cross points of the incident plane and nanoring; the position of these spots are tunable by adjusting the incidence angle of illumination. The tunable plasmonic behavior of the silver nanorings could find applications as optical nanoantennae or plasmonic nanocavities.     

飞机铁鸟舵面加载系统

设计飞机铁鸟舵面加载系统,在地面模拟飞机飞行时舵面铰链力矩,检测舵面收放性能。用MOOG多通道协调加载控制系统、计算机测控工作站、液压伺服加载、反射内存网、时钟同步网、以太网等先进装备和现代技术,建立加载系统总体设计架构。论述铁鸟舵面加载的工作原理,对各个分系统功能和接口进行界定,对关键设备进行选型,对加载安全保护措施进行说明,描述加载系统的功能。基于本设计组建了某型号飞机铁鸟舵面加载系统。试验结果表明,该设计合理、可行。     

Design of FBG En/Decoders in Coherent 2-D Time-Wavelength OCDMA Systems

A novel fiber Bragg grating (FBG)-based en/decoder for the two-dimensional (2D) time-spreading wavelength-hopping optical coding is proposed. Compared with other 2D en/decoders, the proposed en/decoding for an optical code-division multiple-access (OCDMA) system uses a single phase-encoded FBG and coherent en/decoding. Furthermore, combined with reconstruction-equivalent-chirp technology, such en/decoders can be realized with a conventional simple fabrication setup. Experimental results of such en/decoders and the corresponding system test at a data rate of 5 Gb/s demonstrate that this kind of 2-D FBG-based en/decoders could improve the performances of OCDMA systems.     

基于频移的DPCA机载雷达杂波抑制技术

该文采用杂波单元分解的方法分析了相位中心偏置天线(DPCA)对机载雷达主杂波的抑制性能,指出DPCA是一种简单的时-空二维滤波器,并分析了当主杂波中心频率不为零时DPCA杂波抑制能力下降的原因。该文还提出了一种基于主杂波中心频率频移的DPCA处理方法。理论分析和仿真结果均表明该方法具有较好的杂波抑制能力,同时该方法结构简单,便于工程实现。