一种湿度计的校准方法——测量不确定度分析校准法

本文提出了校准湿度计的一种新方法一测量不确定度分析校准法，以利用5121湿度发生器校准可输出（0-5）V的湿度传感器的基本误差为例,介绍了其校准方法确定了该方法校准湿度计的置信度和准确葭：     

一种新型节能臭氧发生器

文章介绍了一种能耗低、效率高、快速生产臭氧的新装置。文中对该装置的工作原理、臭氧的生产过程、影响臭氧产率的因素以及该装置的特点等进行了简要介绍。     

Production of radioactive particles for use in environmental studies

This paper presents an aerosol generation technique developed to produce dry aerosol particles of various sizes from aqueous solutions of salt. The technique was tested with sodium chloride, lithium carbonate and uranyl acetate at various aqueous concentrations which produced particles in the size range of 0.13-1.37 microm Mass Median Diameter (MMD). The generated aerosols were acceptably monodisperse with a geometric standard deviation of 1.4-2. Both MMD and Mass Median Aerodynamic Diameter (MMAD) increased significantly (p<0.001) with increased concentration of the salt in solution. The technique can also be used to generate aerosols of different chemical species. The results obtained indicate that the system is convenient for use with various aerosol-forming materials, with a stable particle size distribution being maintained for a long period of steady operation. The technique was successfully applied in wind tunnel studies to simulate the release of submicron radioactive particles and their interception by crops, grass and tree canopies. The relevance and application of the technique in other areas of environmental assessment studies is discussed.     

窄小场地条件下柴油发电机噪声综合治理

介绍一例窄小场地条件下柴油发电机噪声综合治理工程。通过对机房实行整体封闭隔声与吸声、以消声道兼作通风道强制通风、以消声器加垃圾道消除排气噪声等综合措施 ,使柴油发电机噪声完全达到标准。     

柴油发电机噪声治理改造工程一例

介绍一例窄小空间的大功率柴油发电机噪声改造工程。通过对原机房的改造 ,增加隔声、吸声、通风等措施 ,使发电机噪声排放达标     

A SIMPLE HYDRAULIC SIMULATOR1

ABSTRACT: A simple simulator was constructed, calibrated, programmed and used in management studies of a hydraulic system containing two pumping stations in series, connected by canals and reservoirs. The features of the model, its calibration and use are described, and comparisons between measured and computed hydraulic behavior are presented.     

WILSON柴油发电机组噪声综合治理

介绍了某电信公司柴油发电机组的噪声综合治理,柴油发电机组排烟风道采用两级消声处理,同时设置进排风百叶窗、隔声墙、隔声门和吸声吊顶等设备,治理后噪声排放达到《城市区域环境噪声标准》Ⅱ类区域的噪声标准。     

COMPARISON OF TWO AUTOREGRESSIVE MODELS FOR MONTHLY STREAM FLOW GENERATION1

ABSTRACT: Two autoregressive models for monthly stream flow generation are compared based on the reproduction of the historical record in terms of several important statistics such as the mean, standard deviation, skewness coefficient, correlation coefficient, and the reservoir storage components. In the comparison, both theoretical considerations and practical applications are employed to evaluate the performance of each model.     

CO气体激光检测仪中基于FPGA的信号源设计

在激光检测仪的系统设计中,要求信号源四路波形同步异频发生,且有移相、倍频、波形叠加等要求。利用FPGA技术完成满足以上要求的直接数字频率合成器(DDS)的设计。在实现中选用Altera公司的FPGA芯片EP2C8Q208C8为主芯片进行设计,充分利用了该芯片的超大集成性和快速性。在改进的DDS算法结构的基础上,系统的复杂度降低,更趋于模块化,产生的波形频率更准确。     

负压二次曝气二氧化氯发生器的研制与应用

以氯酸钠和工业盐酸为基本原料,采用独特的负压二次曝气工艺,在催化剂作用下,经氧化还原反应产生以二氧化氯为主的混合消毒气体,经吸收后形成一定浓度的二氧化氯混合消毒液,与待处理水充分混合,达到杀菌消毒的目的。