水体混合扩散实验中的水中荧光计研究

本文描述了国内首次研制成功的用于水体混合扩散实验研究的水中荧光计。该仪器采用光源调制和信号同步解调技术,同时使用专用遮光罩使仪器能在任一日光强度下0—50m深度工作。拖曳速度为0—6节,对于罗丹明B的探测范围是1×10^(-10)—1×10^(-6)g/cm^3。简明叙述讨论了使用LGC2-1A型水中荧光计在不同水质中进行扩散实验的测量结果。

用于海洋探测的多参数拖曳荧光计系统

本文论述了作者研制成功的拖曳荧光计系统。该系统的荧光传感器采用了光源调制和信号同步解调技术，同时在受光器上采用了专用遮光导水暗盒及弯曲导水管，确保荧光传感器在探测体积内水体及时交换，并能有效地消除海中太阳光的影响。系统能在任一日光强度下从海表层至８０ｍ水深任一深度，走航拖曳速度在２～１０ｋｎ内平稳地水平工作。该拖曳体内安装有荧光传感器、温度传感器、深度传感器和多路传输电子线路装置。通过一根直径为１４ｍｍ的电源／信号传输七蕊铠装电缆将拖曳体与手摇绞车及船上控制器、数据采集、记录显示器连接在一起，可以同时测量光学和水文参数，这些数据为０～５Ｖ模拟电压量输出。该系统进行了多次水池和海上现场实验及应用，达到了预期设计目标。并且借助于荧光示踪染料完成了多处海区的水体混合扩散测量实验任务，建立了实验观测方法。本文还介绍了该系统的构造。

Model for Reduction of Iron Oxide Pellet with a C-O-H-N Gas Mixture Considering Water Gas Shift Equilibrium in the Gas While It Diffuses through the Product Layer

In metallurgical processes, more and more usage of hydrocarbons is encouraged to bring down the carbon emissions. In this regard, numerous investigations on reduction of oxides by C-O-H-N gas mixture have been reported. Attempts to simulate these reduction processes using shrinking core model, one of the common models used for such studies, have under predicted the reduction rates. This may be owing to the fact that the homogeneous reaction in the gas phase is not being considered. If the reaction temperatures are above 1,000 K, generally so for many reduction processes, the homogeneous gas reaction rates are expected to be high enough that local equilibrium in the gas phase can be assumed. In the present study, reduction of wustite in a C-O-H-N gas mixture has been modeled using shrinking core model considering the water gas shift equilibrium in the gas while it diffuses through the product layer.