合肥光源储存环温度监测系统

温度是影响电子束轨道稳定的重要因素之一, 大多数加速器都需要为其建立完备的冷却恒温系统及相应的监测系统. 描述了合肥光源基于EPICS(Experimental Physics and Industrial     

基于CMOS图像传感器的微型无人机遥感系统设计

为了实现微小型无人机航空遥感,设计了一种基于CMOS图像传感器的微小型无人机的可见光遥感系统.系统采用CMOS图像传感器替代CCD,利用时序发生模块(Field-Prog Rammble Array,FPRA)实现了控制时序、数据缓存和硬件彩色插值,C8051F单片机作为主控核心,采用FLASH作为数据存储单元,设计了PAL制视频信号生成电路.介绍了所用CMOS图像传感器的特性,分析了Bayer颜色格式进行彩色插值恢复标准RGB颜色格式的硬件实现与软件算法.整个系统重量约20 g,功耗约2 W.在一款翼展800 mm的无人机上实现了遥感拍照,给出了处理后的拍照结果.     

聚变堆遥操作上层协同控制系统设计和测试

为了解决聚变堆遥操作维护上层控制系统普遍存在的软件功能模块过于集中、拓展性差、不具备中层运动规划能力等问题,设计了一种基于机器人操作系统(ROS)的上层协同控制系统。该系统采用分布式架构,基于市场成熟的开发平台进行设计,集成了中层运动规划与动力学虚拟仿真功能。通过“轴销抓取”的实验场景测试的结果表明：该系统满足设计需求,运行稳定。     

天然气管道泄漏可调谐二极管激光遥感探测的研究

天然气管道泄漏不仅造成经济损失而且是危险之源。传统的天然气管道泄漏检测技术效率低、速度慢,难以满足实际应用的需要。近年来以近红外二极管激光吸收光谱为基础的光学传感器由于具有灵敏度高、体积小、重量轻和无需维护等优点而得到了广泛的应用。文章以可调谐二极管激光吸收光谱和谐波探测技术为基础进行天然气管道泄漏遥感探测技术的研究,采用二次谐波与一次谐波信号的比值作为系统浓度标定,结果显示浓度与比值之间具有较好的一致性。文章还就不同地形散射体对探测结果的影响进行了测量和分析,实验结果表明二次谐波与一次谐波信号比值标定技术对便携式二极管激光光学测量能够很好的满足实际应用的需要。     

A spectroscopic database for water vapor adapted to spectral properties at high temperature, and moderate resolution

The prediction of infrared spectral radiance from high temperature media such as combustion gases requires spectroscopic data for triatomic molecules like water vapor and carbone dioxyde. At temperature above 2000 K, water vapor spectrum is composed of hundreds of thousands lines making practical computations uneasy. We have set up a spectroscopic database for water vapor, based on three existing lines compilations. This database is well suited to computation of remote sensing spectra where hot gases emission is seen through atmospheric paths. The database enables efficient computation of water vapor spectra between 600 and 6600 cm⁻¹ at moderate spectral resolution (5 cm⁻¹). It has been used to compute parameters of a statistical narrow band model which are used in practical applications.     

Scattering by randomly oriented thin ice disks with moderate equivalent-sphere size parameters

We use the T-matrix method to compute the scattering matrix for randomly oriented circular ice cylinders with diameter-to-length ratios 1 and 20 and surface-equivalent-sphere size parameters up to 12. We show that wavelength-sized, sharp-edged ice plates with extreme diameter-to-length ratios possess the same scattering properties as smooth platelike spheroids: their phase functions are similar to those of surface-equivalent compact particles, whereas all other elements of the scattering matrix are typical of Rayleigh scattering.     

Determination of ppt levels of atmospheric volatile organic compounds in Yakushima, a remote south-west island of Japan

An analytical method was utilized to detect ppt levels of VOCs in air. The method was based on the US-EPA method TO-14, consisting of canister sampling, three module enrichment and GC/MS analysis. Target compounds included chlorofluorocarbons (four kinds), benzene and its derivatives (14), halogenated hydrocarbons (20), and others (three). The minimum detection limits of the method for the target compounds ranged from 0.016 to 0.040 ppb (0.06–0.23 μg/m³). The recoveries of the target compounds ranged from 77 to 113% and relative coefficients of variation (n=4) were 3.0–9.0%. The sampled air was stable for at least 14 days after pressurizing with humidified nitrogen gas at 200 kPa (absolute pressure). The method was applied to analyze the VOCs in the air of Yakushima, a remote island of south-west Japan where no distinct local pollution source is considered.     

流动注射-分光光度法测定自来水中游离氯的研究

设计了游离氯流动注射自动在线检测仪,并研究了仪器的最佳测试条件.该仪器采用改进的N,N-二乙基-1,4-苯二胺(DPD)比色原理,通过流动注射进样技术,结合光电转化、数字信号处理及自动化控制技术,克服了DPD分光光度法中手工操作的缺陷,实现了样品分析的自动化.结果证明,此系统的试剂用量少、测定范围宽(0.05～6.00...     

Application of Non-Destructive X-Ray Fluorescence Spectrometry to the Analysis of Suspended Matter in Sea Water

Abstract

In the framework of remote sensing studies concerning coastal transport of pollution in the Northern Adriatic Sea, a method has been developed for the quantitative determination of sulphur, iron, titanium, calcium, phosphorus, silicon, aluminium, magnesium in suspended matter of sea water.

The suspended material was collected by filtering on millipore membrane filters with pore width of 0.45 μ and directly analysed by X-ray spectroscopy. For calibration dried solution and particulate standard samples were used. Limits of sensitivity and precision of the method are reported.

Correlations between the concentration of these elements and the total suspended matter/chlorophyll are discussed.

The aim is to study the geochemical composition of particulate matter and its variations within the geographical site of the sea basin and the seasonal conditions. The approach is to consider aluminium and the other elements normalized on Al. On the basis of a matrix correlation analyses of some sets of data chosen in the restricted area for investigation, some hypothesis on superficial distribution of clay, carbonate, iron hydrous oxides and other mineral detrites, are taken into account. The results confirm the complex situation existing in the offshore area of the Venice lagoon from a geochemical point of view.

The suspended matter seem to be argillaceous in the Southern part of the investigated area and semi-argillaceous with hydrous oxides and carbonates in the Northern part which is influenced by the Piave river.