基于智能手机比色测定水环境中的六价铬

在酸性条件下,水样中的六价铬能够和显色剂二苯碳酰二肼反应生成紫红色络合物,该络合物溶液用自制的数字图像比色装置测定颜色值实现六价铬的现场快速检测.该方法在0.05 mg/L～1.00 mg/L范围内线性良好,方法检出限为0.02 mg/L,标准溶液10次测定结果的RSD为1.6％ ～7.9％,实际水样加标回收率为94....     

Assessing anthropogenic impact on Mediterranean sand dunes from aerial digital photography

The Mediterranean region plays host to ca. 33% of the world’s tourism industry. This population of visitors (ca. 147 million in 1990) inevitably exerts an enormous impact on the natural resources of this coastal zone. In May 1997, a new generation Aerial Digital Photographic System [ADPS] configured with a Kodak Digital Science 460 CIR digital camera was used to acquire colour infrared digital photographs of the sand dune systems along the Mediterranean coast of France, from Le Barcares to St-Cyprien-Plage. These have been used to assess the condition of the dunes along this coast. A series of simple analytical techniques to identify and measure features indicative of public pressure using image processing software has been devised. The dune manager with basic computer skills can analyse such indicators as path length, vegetation cover (and conversely the extent of bare sand) to enable monitoring of the performance of their dune systems under particular management regimes. These photographs have been compared with similar digital photographs of dune sites in SW France to allow a comparison of dune degradation in a region with a different population pressure and climate regime. Dune systems sampled from the Mediterranean coastal zone showed more evidence of anthropogenically induced change than those sampled in SW France.     

数字地震记录中干扰波的排除

本文介绍了用MATLAB工具软件实现对数字信号进行频谱分析和设计IIR数字滤波器的方法,对数字地震记录中的干扰波进行谱分析和排除,实现了目标要求。     

"数字环保"战略探讨

经济相对发达地区城市，有良好的信息化基础，在政府的统筹规划下，采用正确的对策，可率先实现“数字环保”战略，进而实现资源的系统化管理及促进区域可持续发展，推动产业结构调整，提升地方科技竞争力，使环境保护工作科学化，规范化，公众化。     

Application of digital technologies about water network in steel industry

To improve the efficiency of water use and reuse, a digitalized water network system was implemented in a steel industrial complex. The system consisted of four parts: online instrument and sensing devices, programmable logic controller, data communication network and control center based on expert knowledge. The system achieved real-time monitoring, diagnosis, and early warning of cooling water system using data collected inline, and enabled data connectivity and transmission of self-developed software applications on personal computer. This research used a steel enterprise as a case study. After the analysis of its cooling water system and water-saving potential using water balance test, a digitalized water network was evaluated and implemented, and we believe this network can be suitable for steel industry in general.     

基于风险的工业管道在线检测技术研究

化工装置工业管道面临焊接和腐蚀两大问题,装置的长期运行与管道定期检验的矛盾日益突出.通过对数字射线、脉冲涡流、超声导波三种管道在线检测技术的对比分析,结合基于风险的检验(RBI)理念,探索出一套适用于工业管道在线检验的技术,对节约企业成本、保障管道安全具有重要意义.     

Functional relationship between ammonia-oxidizing bacteria and ammonia-oxidizing archaea populations in the secondary treatment system of a full-scale municipal wastewater treatment plant

The abundance of ammonia-oxidizing bacteria and archaea and their amoA genes from the aerobic activated sludge tanks, recycled sludge and anaerobic digesters of a full-scale wastewater treatment plant (WWTP) was determined. Polymerase chain reaction and denaturing gradient gel electrophoresis were used to generate diversity profiles, which showed that each population had a consistent profile although the abundance of individual members varied. In the aerobic tanks, the ammonia-oxidizing bacterial (AOB) population was more than 350 times more abundant than the ammonia-oxidizing archaeal (AOA) population, however in the digesters, the AOA population was more than 10 times more abundant. Measuring the activity of the amoA gene expression of the two populations using RT-PCR also showed that the AOA amoA gene was more active in the digesters than in the activated sludge tanks. Using batch reactors and ddPCR, amoA activity could be measured and it was found that when the AOB amoA activity was inhibited in the anoxic reactors, the expression of the AOA amoA gene increased fourfold. This suggests that these two populations may have a cooperative relationship for the oxidation of ammonia.     

Mine safety information technology in the framework of Digital Mine

Digital Mine is a key research domain of Digital Earth. Because of the spatio-temporal, three-dimensional and intrinsically dynamic nature of mine safety management data, it is difficult to make a breakthrough in this domain. As a key part of Digital Mine, the construction of the Digital Mine Safety Management System (DMSMS) pushes Digital Mine a step forward from operation as a mere concept to achievement as a realistic system. In this paper, the technical framework of the DMSMS in the framework of Digital Mine is discussed, including its data, function and application layers. A key technology is then studied in detail that will enable the construction of the three-dimensional geological environment and the visualization and integration of the mine safety data.     

GIS环境下基于DEM的中国流域自动提取方法

应用地理信息系统平台,建立基于水文站网和水资源信息的空间化水循环数据库是研制开发全国水循环信息管理系统的关键和基础,为了与全国水文站网的观测资料相匹配,水循环数据库的结构将按流域组织,因此快速、有效地自动提取全国流域是所有工作进展的前提。为了从数字高程数据中自动提取全国流域,以提高基于GIS的全国水资源信息获取的效率,从DEM的特性出发,提出了一种从DEM中自动提取全国流域的实用方法。该方法利用1：25万DEM数据,首先将全国流域划分为14大流域片,并在每一流域片内分别提取流域。提取过程如下：首先对DEM数据进行填洼和削峰,然后确定每个栅格单元的水流方向,再根据各栅格单元的水流方向,计算出每个栅格单元的汇流能力,根据汇流能力采用阈值法确定河流网络,最后通过河流网络和流域出水口,快速识别出所有子流域。另外,还给出了利用GIS软件ARC/INFO GRID提取全国流域的AML程序代码,并以海河流域作为实验区将抽样测量结果和自动提取结果进行了实验对比分析,其结果表明利用该方法提取的流域数据与利用手工方法绘制的流域基本一致,证明该方法是有效的。