基于开源GIS类库开发DLG入库整合系统

介绍了开源GIS软件的特点与优势,并结合DLG生产的实际情况,采用C＃语言在AutoCAD 平台下,实现了基于开源GIS类库NTS的数据入库整合系统的研发,阐述主要关键模块的实现方法。     

Molecular diversity of Enteromorpha from the coast of Yantai: a dual-marker assessment

We collected nine Enteromorpha specimens from the coast of Yantai and evaluated their diversity based on analyses of their ITS （internal transcribed spacer） and 5S rDNA NTS （non-transcribed spacer） sequences. The ITS sequences showed slight nucleotide divergences between Enteromorpha linza and Enteromorpha prolifera. In contrast, multiple highly variable regions were found in the ITS region of Enteromorpha flexuosa. In general, there were more variable sites in the NTS region than in the ITS region in the three species. The variations in 5S rDNA NTS sequences indicated that the molecular diversity of Enteromorpha from the coast of Yantai is very high. However, a phylogenetic tree constructed using 5S rDNA NTS sequence data indicated that genetic differences were not directly related to geographical distribution.     

CASS、NTS660、RTK线路数据互转

简要介绍分析了CASS成图系统软件、NTS660全站仪和动态GPS-RTK的线路数据格式,编写了简明的应用转换程序,实现了三种产品格式的互转,达到资源共享,方便了测绘工作。     

Numerical-analytical interfacing in two dimensions with applications to modeling NTS seismograms

A new method for interfacing numerical and integral techniques allows greater flexibility in seismic modeling. Specifically, numerical calculations in laterally varying structure are interfaced with analytic methods that enable propagation to great distances. Such modeling is important for studying situations containing localized complex regions not easily handled by analytic means. The calculations involved are entirely two-dimensional, but the use of an appropriate source in combination with a filter applied to the resulting seismograms produces synthetic seismograms which are point-source responses in three dimensions. The integral technique is called two-dimensional Kirchhoff because its form is similar to the classical three-dimensional Kirchhoff. Data from Yucca Flat at the Nevada Test Site are modeled as a demonstration of the usefulness of the new method. In this application, both local and teleseismic records are modeled simultaneously from the same model with the same finite-difference run. This application indicates the importance of locally scattered Rayleigh waves in the production of teleseismic body-wave complexity and coda.