低信噪比激光引信回波幅值提取技术

在对激光引信回波进行信噪比分析的基础上,针对低信噪比时峰值检测法在回波幅值提取中相对误差较大的问题,提出了一种采用小波阈值去噪提高幅值提取精度的方法。基于Mallat算法对回波信号进行快速分解与重构,并实际计算了峰值检测法在低信噪比回波幅值提取中的相对误差。研究结果表明,小波阈值去噪能较好地分离回波信号中的高频噪声,减小低信噪比回波幅值提取的相对误差,从而提高了回波幅值提取的精度。     

新一代直升机综合数据处理平台设计及应用

针对新一代机载通信平台减重量、降功耗的需求，指出了当前数据处理平台采用单核或同构多核(Symmetrical Multi-processing,SMP)模式存在重量重、功耗大的问题，提出了数据处理平台采用异构多核(Asymmetrical Multi-processing,AMP)工作模式，从SMP和AMP两种模式的实现架构、工作原理以及实物上展开对比分析并将AMP成果应用到当前的新型机载平台。实物验证对比表明，相较于SMP模式平台，AMP模式平台带来重量减轻近50%、功耗降低近50%的效益。     

广东省阳江和台山核电站辐射环境现场监督性监测系统各个监测子站的运行维护

介绍了广东省环境辐射监测中心对阳江核电站和台山核电站辐射环境现场监督性监测系统各个监测子站运行维护情况, 提出监测子站运行维护过程中存在的相关问题, 以及对监测子站升级改造和选址建设的建议。     

间溴苯甲醚生产的技术经济分析

本文介绍了间溴苯甲醚的合成方法，并对间溴苯甲醚的生产做了技术经济分析。间溴苯甲醚的生产和应用前景广阔     

细胞结构与生物器官组织的计算机仿真

该文介绍了细胞结构的计算机仿真方法，二维肥皂泡的计算机仿真方法具有普遍性，这一方法可应用于其它领域类似的课题，生命科学中使用计算机仿真及其独特的优越性，本文还介绍了非洲爪蟾脊索器官形成的计算机仿真方法。     

微波诱导催化脱硝研究进展

发展经济高效的烟气脱硝技术是大气污染控制领域的重要研究方向,利用微波诱导催化技术开展烟气脱硝已成为当前热点方向。本文对近年国内外研究人员关于微波诱导催化治理烟气NO_x的研究成果进行了综述,详细介绍了微波还原脱硝和微波氧化脱硝相关成果,重点讨论了以碳酸氢铵和活性炭为还原剂的微波诱导还原催化脱硝技术以及ZSM-5、金属氧化物和钙钛矿型混合氧化物微波催化还原脱硝技术。最后通过对比微波还原脱硝和微波氧化脱硝两种方法,提出研发微波催化氧化脱硝技术、探究其反应机理是开发新型烟气脱硝技术的重要方向。     

Theoretical and experimental analysis of the core sampling method: Reducing diffusional losses in aerosol sampling line

Core sampling method (extracting a portion of a flow from the core of the flow) will reduce diffusional losses of highly diffusive species (e.g., aerosol nanoparticles, ions, and gases) when transporting them through a sampling tube. Revealing parameters governing the sampling efficiency of a core sampling system, η_sam, helps to design the apparatus and to optimize its performance. In this study, we report an analytical solution for quantifying the η_sam by solving the convection diffusion equation of laminar flow field. The analytical results were experimentally evaluated using 1–5?nm tungsten oxide nanoparticles. η_sam is governed by a dimensionless loss parameter and the transport-to-sample flow ratio. Theoretically predicted values for η_sam agree with experimental results, e.g., the relative deviation is within 5% when the value for the loss parameter is less than 0.1. The core sampling method is recommended to work at the loss parameter less than 0.1 such that η_sam is equal or close to the maximum value of unity and is also insensitive to variations in sampling conditions. In this study, how to apply the findings in designing and optimizing a core sampling system was discussed. A core sampling apparatus was then designed and experimentally evaluated. Its sampling efficiency was shown to be significantly higher than those of a tee, a cross fitting, and a Y fitting when the same sampling conditions were used.

Copyright © 2019 American Association for Aerosol Research     

Riyear-PowerNet智能配电监控系统在常熟电厂输煤工程中的应用

本文介绍了Riyear-PowerNet智能配电监控系统在常熟电厂输煤Ⅰ、Ⅱ段配电监控项目中的应用,阐述了基于Modbus现场总线的监控配电系统"四遥"功能的实现。同时,也叙述了Riyear-PowerNet智能配电监控系统鲜明的特点。     

变论域模糊PID控制在交流发电系统中的应用

在三级式交流发电系统中一般使用传统PID控制器进行调压控制,但是在某些工况下该控制策略难以满足复杂系统的高精度、快响应要求。通过在传统PID控制器的基础上,分析了其不足之处,引入了模糊PID控制策略。同时,针对模糊PID在系统的动态调节过程中论域过小的问题,提出了一种基于变论域模糊控制理论的PID控制器,并与传统双环PID控制和普通的模糊PID控制在MATLAB/Simulink软件中进行对比仿真,验证了该控制策略具有更好的稳态调节精度和动态调节性能,与传统双环PID控制器相比,稳态误差从0.5%优化到0.3%,动态调节时间从0.4 s缩短至0.2 s。     

Two-Stage Plans for Estimating the Inverse of a Monotone Function

This study investigates two-stage plans based on nonparametric procedures for estimating an inverse regression function at a given point. Specifically, isotonic regression is used at stage one to obtain an initial estimate followed by another round of isotonic regression in the vicinity of this estimate at stage two. It is shown that such two-stage plans accelerate the convergence rate of one-stage procedures and are superior to existing two-stage procedures that use local parametric approximations at stage two when the available budget is moderate and/or the regression function is “ill-behaved.” Both Wald- and likelihood ratio-type confidence intervals for the threshold value of interest are investigated and the latter are recommended in applications due to their simplicity and robustness. The developed plans are illustrated through a comprehensive simulation study and an application to car fuel efficiency data.