ESR DATING OF FLUVIAL SEDIMENTS USING GE CENTER IN QUARTZ

Using the Ge centers of quartz sediments, the buried ages of fluvial sediments were determined by ESR technique. The ESR ages obtained from Ge centers are consistent with the TL ages, correspond with their horizons, accord with the geological background, and every ESR age is available. In this paper, determination of total dose of natural radiation (TD) and the reliability of ESR age using Ge center are also discussed.     

GPS共视法时间比对在陕西天文台的建立

利用国产GPS定时型接收机,按照国际共视规程,陕西天文台建立了GPS共视法时间比对.研究了影响比对精度的因素,实现了微机控制的数据自动采集和处理,实现了国际间的全面共视比对.1991年3月起,BIPM已正式用于国际原子时TAI的计算中。     

神经网络专家系统外壳

神经网络专家系统外壳软件,是用于帮助用户迅速开发直观图形解释的人工智能业务应用系统。它以直观的屏幕树图为媒介,实现了正、反向推理机、语义网络、神经元网络、框架结构、知识库管理和算术表达式树图等整体宏观统一;实现了专家系统与人工神经元网络、定性分析与定量计算的统一;无监督分类与监督分类的统一。因此,它的应用范围很广。     

论地质旅游资源

地质旅游资源是自然旅游资源的核心,以成因、物质基础、空间分布为基础,结合其形态特征、社会经济特征等因素对地质旅游资源进行了初步分类,并探讨了地质旅游的特色及发展前景.     

倾斜矢量图正常年变化破坏的机理研究

根据云南省楚雄、永胜台的倾斜矢量图在强震前正常年变化被破坏的事实,探讨了矢量图面积异常与地震的关系。认为矢量图所围面积的变化与地下水的作用固然有一定的关系,而起决定作用的是地震前应变积累的程度。倾斜矢量图面积的减小可以作为预报的一项参考指标。     

A New Approach for Studying Hubble Diagrams of Quasars

In this paper, a new approach for studying Hubble diagrams of quasars is introduced. The purpose is to reduce the well-known very large scatter in the diagram. We believe that the scatter is mainly caused by the wide spread of luminosity distribution of quasars. Based on a large number of quasars having been discovered, we introduce a new quantity, the collective apparent magnitude of certain amount of quasars in a corresponding redshift interval, and make a plot of the collective apparent magnitude versus redshift with the data published by Hewitt and Burbidge (1993). The quantity is contributed by individual apparent luminosities as well as the luminosity distribution of quasars. Scatter is expected to be largely reduced in the corresponding diagram, and this is indeed true as shown by the figures. By discussing several possible effects and from the figures, we find that the assumption that redshifts of quasars are distance indicators is confirmed, and the standard cosmological model is supported. This revised version was published online in July 2006 with corrections to the Cover Date.     

快速数论变换的一种算法

本文构造了一种快速数论变换算法,该算法是一种以数论为基础,有效高速的数论变换算法,并且这种算法易于在计算机上实现。     

生物生态防治虾病研究

本文探索虾病防治新途径,采用低值海藻江蓠和对虾混养的生态学方法,江蓠吸收水中二氧化碳进行光合作用,产生大量氧气;同时吸收有机物的分解物 NH_3—N,加速有机物分解。减少 H_2S 积累;从而消除水中紧迫因子威胁,大大减少池水自污及病害,起到抑菌、抑虫、净化水质作用,提高成活率,试验圹对虾成活率达95.1%,对照圹56.6%。试验结果表明,虾病防治效果显著,经济效益明显。     

Contemporary processes of environmental information in the atmosphere-glacier-runoff system in an area of typical monsoon temperate glacier

Sampling was carried out at Baishui No. 1, the largest glacier on Mt. Yulong, China, during the summers of 1999 and 2000, to investigate the spatial variations of oxygen isotopes in the atmosphere-glacier-river system. The results confirm that there is an inverse relation between the oxygen isotopic composition of precipitation and air temperature/precipitation amount. This suggests that a strong “precipitation amount effect” exists in this typical monsoon temperate-glacier region. There are marked differences of the δ¹⁸O values of winter-accumulated snow, glacial meltwater, summer precipitation and the glacier-fed river water. Spatial and temporal variations of isotopic composition are controlled by climatic conditions. Isotopic fractionation and differentiation occur during phase changes, snow-to-ice and ice-to-meltwater transformations, and runoff processes. Variations of stable isotopes in glacier runoff can indicate variations of sources of supply, as well as different discharge-related processes. Ionic changes occur as a result of meltwater contact with glacier bed materials.

     

基于ArcEngine的ArcGIS与AutoCAD数据转换研究

空间数据的交互和共享成为GIS中比较受关注的问题。介绍如何通过ArcEngine来实现ArcGIS与AutoCAD在不同的存储机制上图形数据交互共享的方法。