DMC数码航摄及制作1：500正射影像图（DOM）的实践与探索

介绍了数码航摄构成和特点，及利用数码数据制作DEM、DOM的工艺流程和成果精度检测。     

LiDAR点的精度检验

LiDAR机载激光扫描测高或激光雷达(LiDAR)是一种安装在飞机上的机载激光探测和测距系统,可以量测地面物体的三维坐标,在三维地理空间信息的数据采集方面有广阔的发展前景和应用需求。本文介绍了LiDAR测量技术的优越性及其应用,提出了LiDAR点精度的检验方法,并运用实例对加拿大OPTECH公司的ALTM3100系统的Li-DAR点的高程、平面精度进行内符合、外符合检验,并提出了提高LiDAR点精度的方法。     

基于DOM的XML解析与应用

随着XML的广泛应用,大量的信息都将通过XML文档来进行存储、交换,因此熟悉和掌握一种解析XML文档的方法是很重要的.着重介绍基于DOM的XML解析的特点、实现和在数据存储方面的应用,对推广应用XML和DOM技术有一定的实用意义.     

基于XML的数据库查询体系设计

该文从该问题出发,提出了把数据库表变换为XML文档实施数据的查询这一解决思路。该文首先对SAX、DOM、XPath 3种实现XML查询技术的原理进行了分析,阐述了3种技术的优缺点及适用范围,提出了把XPath与DOM相结合的一种灵活简单的XML查询方案,并且构建了XML查询应用模型。     

Photosensitized degradation of amoxicillin in natural organic matter isolate solutions

Amoxicillin is a widely used antibiotic and has been detected in natural waters. Its environmental fate is in part determined by hydrolysis, and, direct and indirect photolysis. The hydrolysis rate in distilled water and water to which five different isolated of dissolved organic matter (DOM) was added, were evaluated. In the five different DOM solutions hydrolysis accounted for 5-18% loss of amoxicillin. Direct and indirect photolysis rates were determined using a solar simulator and it appeared that indirect photolysis was the dominant loss mechanism. Direct photolysis, in a solar simulator, accounted for 6-21% loss of amoxicillin in the simulated natural waters. The steady-state concentrations of singlet oxygen, ¹ΔO₂ (∼10⁻¹³ M) and hydroxyl radical, •OH (∼10⁻¹⁷ M) were obtained in aqueous solutions of five different dissolved organic matter samples using a solar simulator. The bimolecular reaction rate constant of ¹ΔO₂ with amoxicillin was measured in the different solutions, kΔO₂ = 1.44 × 10⁴ M⁻¹ s⁻¹. The sunlight mediated amoxicillin loss rate with ¹ΔO₂ (∼10⁻⁹ s⁻¹), and with •OH (∼10⁻⁷ s⁻¹), were also determined for the different samples of DOM. While ¹ΔO₂ only accounted for 0.03-0.08% of the total loss rate, the hydroxyl radical contributed 10-22%. It appears that the direct reaction of singlet and triplet excited state DOM (³DOM^∗) with amoxicillin accounts for 48-74% of the loss of amoxicillin. Furthermore, the pseudo first-order photodegradation rate showed a positive correlation with the sorption of amoxicillin to DOM, which further supported the assumption that excited state DOM^∗ plays a key role in the photochemical transformation of amoxicillin in natural waters. This is the first study to report the relative contribution of all five processes to the fate of amoxicillin in aqueous solution.     

基于DOM的XML解析技术在构件描述中的应用

在Visual C#中,解析器可将代码中的扩展标记语言(eXtensible Markup Language,XML)注释处理为外部XML文档。文档对象模型(Document Object Model,DOM)定义了一个独立于平台和语言的标准接口,应用程序通过它访问和修改XML文档数据。介绍了DOM的特点和功能,并在ASP.NET平台下通过封装的DOM类库解析和存取XML文档,完成了对XML文档数据提取,将解析出的数据导入数据库作为构件描述信息的应用实例。     

利用LiDAR成果生产数字线划图的简易方法

提出一种利用LiDAR成果生产数字线划图的简易方法,实现了大比例尺地形图的快速更新与维护.     

网页动态页面采集关键技术研究

随着web2.0技术飞速发展,Internet上动态网页的数量越来越多,为互联网媒体内容监控工作带来根大的挑战。基于此扩展了原有互联网媒体内容监控系统的网络爬虫,嵌入了动态页面采集程序,进一步丰富了系统的信息采集来源。     

Photochemical transformation of terbutaline (pharmaceutical) in simulated natural waters: Degradation kinetics and mechanisms

In this study, varied nature organic matter isolates were employed to investigate the indirect photo transformation of terbutaline, which is a major feed additive medicine to increase the proportion of lean meat in the livestock. In the indirect photolysis of terbutaline under solar simulated irradiation, ¹O₂ plays an important role among the •OH and ³DOM^∗. The reaction rate constant of ¹O₂ was determined as (7.1 ± 0.3) × 10⁶ M⁻¹ s⁻¹ at pH 7.0, while the reaction rate constant of •OH was (6.87 ± 0.43) × 10⁹ M⁻¹ s⁻¹. The contribution of singlet oxygen to the indirect photolysis of terbutaline (19–44%) was higher than that of the hydroxyl radical (1–7%). The pseudo first order rate constants for the photodegradation of terbutaline increase with increasing pH, which indicates that pH mainly affects the reaction rate of the singlet oxygen with the phenolic part of the terbutaline. The Quinone was identified as the main photosensitized product through LC–MS/MS analysis. It is also proposed that the degradation pathway of terbutaline involves reaction between the phenolic part of terbutaline and singlet oxygen. This finding strongly suggests that singlet oxygen was important factor for the photodegradation of terbutaline in natural waters.