高温氧化-化学发光检测法测定水中总氮

采用高温氧化-化学发光检测法（high temperature oxidation ＆ chemiluminescence, HTO-CL）进行水质总氮（TN）的在线测定。总氮浓度（CN）与化学发光的强度（IN）呈良好的线性关系,线性区间为0．05～100mg／L。对真实水样采用本方法进行测定,其结果与国标方法相符,回收率在90％～110％之间。以本方法为工作原理的TN-2000型总氮测定仪可用于地表水质及污水的在线监测。     

Dynamics of gel isoelectric focusing with ampholytic dyes monitored by camera in real-time

The dynamics of gel isoelectric focusing were studied by using amphoteric low-molecular-mass colored substances (isoelectric point markers). The polyacrylamide gel in slab format was in direct contact with the electrodes. In addition to isoelectric focusing with a pH gradient composed of synthetic carrier ampholytes, pH gradients created by simple buffers of acetic acid, 2-(N-morpholino)ethanesulfonic acid, histidine and N,N,N',N'-tetramethylethylenediamine were applied. The progress of the electrofocusing process was monitored by a charge-coupled device camera and video recording. The gradient profile and dynamics were approximated from the positions of isoelectric point markers, which were focused both on boundaries between individual zones of simple buffers and within the zones themselves. The obtained animated records enabled the observation of the entire real focusing run within fractions of a minute, which is useful both for the understanding and optimization of the focusing.     

Design and simulation of a wire position monitor for cryogenic systems in an ADS linac

This paper introduces the design and simulation of a Wire Position Monitor(WPM)used in the cryogenic system of an Accelerator Driven System(ADS).The WPM is designed to monitor the contraction of cold masses during the cooling-down operation.In this paper,POISSON-2D electrostatic field software is used to calculate the best characteristic impedance for the WPM.Furthermore,the time domain signal of different end structures is theoretically analyzed and simulated.The coupling of electrodes and the influence of signal carrier size,which may influence the induced signal,are also discussed.Finally,the linearity of the induced voltage and the sensitivity of the WPM are analyzed.The time domain simulation results are consistent with the theoretical analysis.The influences of the coupling and carrier size are very small,and the linearity of the normalized voltage is good within r/2.     

Measuring particle size-dependent physicochemical structure in airborne single walled carbon nanotube agglomerates

As-produced single-walled carbon nanotube (SWCNT) material is a complex matrix of carbon nanotubes, bundles of nanotubes (nanoropes), non-tubular carbon and metal catalyst nanoparticles. The pulmonary toxicity of material released during manufacture and handling will depend on the partitioning and arrangement of these components within airborne particles. To probe the physicochemical structure of airborne SWCNT aggregates, a new technique was developed and applied to aerosolized as-produced material. Differential Mobility Analysis-classified aggregates were analyzed using an Aerosol Particle Mass Monitor, and a structural parameter Γ (proportional to the square of particle mobility diameter, divided by APM voltage) derived. Using information on the constituent components of the SWCNT, modal values of Γ were estimated for specific particle compositions and structures, and compared against measured values. Measured modal values of Γ for 150 nm mobility diameter aggregates suggested they were primarily composed of non-tubular carbon from one batch of material, and thin nanoropes from a second batch of material – these findings were confirmed using Transmission Electron Microscopy. Measured modal values of Γ for 31 nm mobility diameter aggregates indicated that they were comprised predominantly of thin carbon nanoropes with associated nanometer-diameter metal catalyst particles; there was no indication that either catalyst particles or non-tubular carbon particles were being preferentially released into the air. These results indicate that the physicochemistry of aerosol particles released while handling as-produced SWCNT may vary significantly by particle size and production batch, and that evaluations of potential health hazards need to account for this. Disclaimer: The mention of any company or product does not constitute an endorsement by the Centers for Disease Control and Prevention. The findings and conclusions in this paper are those of the authors and do not necessarily represent the views of the National Institute for Occupational Safety and Health.     

基于频域活动性的码率控制算法的研究

码率控制是恒定码率视频压缩编码系统的一个关键研究课题。本文提出了一种基于频域活动性的修正的TM5码率控制算法。该算法以TM5为基础，同时采用了一些有效的措施．诸如：频域括动性分析、场景变化分析、码字利用映像和强制缓存控制等。对所提出的修正的TM5码率控制算法．本文进行了计算机模拟实验，实验结果证明了本文所提出的算法可以有效地弥补现有的码率控制算法的不足，可适用于多种视频压缩的应用领域。     

中国联通WCDMA3G国土资源监控解决方案

介绍利用WCDMA3G无线通信网络和视频监控技术进行国土资源监控的解决方案,该方案主要用于解决传统卫星遥感成像技术不能及时发现问题的弊端,为耕地保护工作提供一种新型、高效、可行的技术手段。     

基于无线传感网络的瓦斯监控报警系统

该文设计了以CC2430为核心的无线传感网络的瓦斯监控报警系统。该系统通过放置大量的无线传感器网络采集节点,实时进行节点处瓦斯浓度的采集和换算,并通过模糊PID控制实现节点附近的瓦斯浓度的智能化控制。     

基于GIS的露天矿车辆运输监控系统

车辆运输监控是露天矿车辆管理的主要内容,也是影响露天矿企业生产效率的重要因素之一。阐述了露天矿车辆运输监控系统的开发技术、系统功能以及实现GIS的关键技术,在某钼矿的应用中,系统运行状况良好,实现了对露天矿车辆的实时监控和调度。     

基于SOPC的实时图像存储系统的设计

基于目前实时图像存储的解决方案研究的现状与发展趋势,本文研究了基于SOPC技术的实时图像存储设计方案。使用ALTERA公司的NiosII软核处理器作为总控制器,采用CCD传感器加ADV7181B视频解码芯片进行实时图像数据采集,SDRAM用来存放实时图像数据与程序,VGA控制器控制实时图像显示。