鄱阳湖水动力模型的遥感验证研究

应用湖泊水动力模型EFDC模拟了鄱阳湖2009-2011年的水动力过程。结果表明:模拟日平均水位及流量与水文站观测结果基本一致,相关系数达到0.94以上。针对现场观测数据单一匮乏的问题,借助遥感手段较为全面地验证分析了模型的实用性。通过雷达高度计ENVISAT RA-2和MODIS影像获取的水位、水体面积及淹水范围与模拟结果相关性较好,相关系数均达到0.83以上,证明该模型能够有效地揭示鄱阳湖高动态变化的水动力特征。此外,遥感手段也为模型的多角度长期验证提供了技术依据。     

高可靠性数据传输系统LVDS交叉备份方法

以一种高可靠性数据传输系统为例，详细阐述了采用LVDS输出电平标准的交叉备份方案的设计，比较了LVDS端交叉和TTL端交叉各自的优缺点。对TTL端交叉备份方式进行了分析，重点讨论了TTL几端交叉备份方式解决主备故障隔离的几种方法，并分析了各种方法在实际应用中存在的不足。最后给出了该高可靠性数据系统中所采用的跨接电阻方案。该方案具有设计简单、可靠性高的优点。     

RETRIEVING RIVER ATTRIBUTES FROM REMOTELY SENSED DATA: AN EXPERIMENTAL EVALUATION BASED ON FIELD SPECTROSCOPY AT THE OUTDOOR STREAM LAB

This paper summarizes experiments conducted at the Outdoor Stream Lab to gain insight on the relationships between a channel's spectral characteristics and the river attributes of interest to scientists and managers. Improved understanding of these connections would advance the application of remote sensing to fluvial systems. Motivated by this objective, we examined the following: (i) interactions among local hydraulics, water surface roughness and surface reflectance; and (ii) the influence of periphyton development and streambed disturbance on bottom reflectance. These experiments could thus lead to novel methods for inferring flow velocity and substrate type, respectively, from passive optical image data. Our initial results indicate the following: (i) water surface reflectance can compromise spectrally based depth retrieval by reducing the range of useful wavelengths and weakening correlations between band ratios and depth, implying that removing the surface‐reflected component of the total radiance could facilitate bathymetric mapping; (ii) water surface roughness was influenced by local hydraulics and was positively correlated with water surface reflectance, suggesting that observations of surface reflectance could be used to infer flow velocities; (iii) substrate spectral characteristics were influenced by the degree of periphyton development, implying that algal biomass might be estimated from remotely sensed data; and (iv) similarly, bottom reflectance differed significantly for intact versus disturbed substrates, suggesting that areas of streambed disturbance might be identified via remote sensing. Future work will focus on further elucidating connections between surface reflectance, water surface texture and flow velocity, and developing quantitative relationships between bottom reflectance, periphyton abundance and the degree of streambed disturbance. Copyright © 2013 John Wiley & Sons, Ltd.     

Small eddies observed in Lake Superior using SAR and sea surface temperature imagery

Making use of the fine resolution of satellite SAR imagery, we observe small eddies during the spring and summer months in several locations in Lake Superior. During these months there is a thermal gradient between warmer nearshore waters and colder offshore waters which enhances cyclonic coastal currents. Using spaceborne SAR imagery from the European Space Agency's ERS-1 and ERS-2 missions from 1992 to 1998, we observe small eddies, identifying and mapping basic eddy characteristics including diameter, location, and rotational sense. In total, 45 eddies were located, of which 41 were cyclonic and 4 anticyclonic. Average diameter was 9.8 km and average distance to shore was 8.1 km. Based on sea surface temperature data from AVHRR, the eddies are located within the region of sharp thermal gradients of order 3–5 °C per 3 km. Spatial and temporal coverage was uneven, however, more eddies were seen in SAR images taken in late summer along the southern and eastern shores as well as areas where the boundary current interacts with topographic features including islands and promontories.     

遥感与GIS在洪水灾情分析中的应用

在探讨不同遥感平台（卫星、飞机和地面）获得的不同种类（波段）遥感信息监测洪水灾害的基础上，分析了应用复合遥感信息监测洪水灾害的可能性和先进性，设计了１个专用于地理信息系统洪灾损失信息存储和管理洪水灾情分析所需的信息系统，最后，探讨了洪水灾情信息快速获取的途径，建立起基于遥感和ＧＩＳ的洪水灾情分析模型ＦＬＯＯＤＡＭ试验研究表明，运用该模型可快速获取洪水淹没范围区内灾害的损失信息     

继电保护和自动装置压板回路远方控制技术与应用

通过对继电保护及自动装置远方控制问题的分析，提出利用远方控制高压电气设备的原理，将电触发命令转换成位置状态变换、用机械闭锁方式实现自保持功能，实现远方投退继电保护及自动装置压板回路的解决方案。针对现场具体情况进行了“一对一”、“一对多”实例分析。     

我国老年人异地医保的困境与对策

近些年来城市人口流动频繁,老年人因各种原因的迁移也在逐渐增多,异地医疗费用报销和医保关系转移等问题困扰着越来越多的老年人.目前我国老年人异地就医面临着报销手续复杂、比例较低等困境,地区间利益冲突、各地政策不一致、监管难度大等是造成困难的原因.针对上述问题提出完善异地就医政策和设置定点医院、提高统筹层次,实现省际间医保的转移和最终实现全国统筹三个阶段性的对策.     

基于eCos操作系统的仪器设备远程监控系统设计

现代仪器设备工作于恶劣环境中,传统的监控方式采用RS232、RS485等方式,其传输距离有限,不利于集中远程监控,文章开发一种基于eCos操作系统的新型远程监控系统,通过RS232接口和设备互联,实现远程信息获取功能。该系统成本低廉,采用WEB方式控制,使用方便。     

地下水水位自动监测网络系统研制

采用远程数据通讯技术,利用现有的电话通讯网络,研制了地下水水位自动监测网络系统.介绍了地下水水位自动监测网络系统的基本原理、技术指标、硬件系统和可视化操作软件系统等.     

小型水电站监控系统中的远程通信技术实现

介绍了远程通信技术中基于电话线载波的远程控制技术以及基于手机短信息的远程报警技术在小型水电站监控系统中的应用，并给出了系统框图及部分硬件电路。