基于GeoSurf建立绿色食品交易中心网站的可行性研究

因特网地理信息系统与电子商务的结合 ,有其独到的特点。特别是对于绿色食品的电子商务 ,具有一种地域的直观性 ,为客户提供全面完整的产品信息 ,消除客户决策中的不确定性。GeoSurf开发平台为地理空间信息的可视化表示提供了技术基础。综合多学科技术研究成果 ,提出一种新的电子商务网站的开发模式     

Local relaxation around [6]Cr 3+ in synthetic pyrope–knorringite garnets, [8]Mg 3 [6](Al 1-X Cr X 3+) 2 [4]Si 3O 12, from electronic absorption spectra

Pyrope-knorringite garnets, Mg₃(Al_1-X Cr³⁺_X)₂Si₃O₁₂ with X=0.25, 0.50, and 1.00, were synthesized between 9 and 16 GPa and 1300 and 1600 °C, using multianvil high-pressure techniques. The garnets with X=0.25 and 0.50 are fine-grained, pink and violet in color. The end-member knorringites with X=1.00 are black when compact and gray when coarse-grained. The fine powder is greenish gray in natural light and pale pink under a tungsten lamp. Powder remission spectra in the wavenumber range 30 000–10 000 cm^–1 on finely powdered crystals were measured by two different methods: (I.) by the use of a small integrating sphere for small samples or (II.) microscope-spectrometric measurement using diffusely reflected radiation from a 45° illuminated microsample. Both methods yielded similar diffuse reflectance spectra. The following crystal-field parameters of ^[6]Cr³⁺ were determined for garnets with X=0.25, 0.50, 1.00: 10 Dq=17 856, 17 596, 17 286 cm^–1; and B=654, 677, 706 cm^–1; nephelauxetic ratio =(B_field/B_free)= 0.71, 0.74, 0.77. The -values indicate decreasing covalency of the Cr–O bond with increasing Cr content. The 10 Dq value for together with the mean Cr–O distance in end-member knorringite, 1.96 Å (Novak and Gibbs 1971), were used to calculate from the spectral data, local mean Cr–O distances (Langer 2001a) as a function of composition. The results indicate relatively strong local site relaxation with a value of =0.77.     

电子地图的基础理论与框架体系

电子地图作为现代地图学发展的一个新地图产品形式，其意义不仅仅在产品本身，而是由此带来的一系列理论、技术与方法的变革。本文从电子地图的概念、内容出发，探讨电子地图与传统地图、数字地图和GIS的关系，以及支持电子地图建立、表达与应用的框架体系。     

全站仪对边测量原理及精度分析

对边测量是全站仪的一种专项测量功能,它可用来间接测量两个不可通视点之间的水平距离。该方法设站灵活,操作简单,但其测量精度没有标注,需要通过计算求得。本文根据全站仪对边测量的基本原理,推导出对边测量的精度计算公式,通过实例计算,对其精度进行了分析,讨论了对边测量在测站改变时其精度变化的规律,提出了提高对边测量精度的方法。     

国土资源部电子政务基础平台（E-LARP）的设计与实现

本文从建设目标、技术路线、软件总体框架及软件构成等四个方面通过阐述了国土资源部电子政务基础平台,并对基于基础平台进行国土资源政务信息化建设所需具备的条件、适用范围和应用模式进行了分析。     

浅谈煤炭勘察设计企业电子档案管理系统的实现

文章针对煤炭勘察设计行业档案工作的现状,阐述了建立电子档案管理系统对提高企业经济效益、增强企业竞争能力的必要性,并根据勘察设计工作的需要提出电子档案管理系统的建立。     

Study on the change of Keqikaer Glacier during the last 30 years,Mt. Tuomuer,Western China

Using radio echo sounder, ice thickness of Keqikaer Glacier tongue was measured in 1981 and 2004. Data obtained by comparing topographical maps, aerial and satellite photographs at different times, illustrates changes of the thickness and advance/retreat of Keqikaer Glacier. Keqikaer Glacier has been in intensive retreat since the 1990s and become thinner since the 1980s. Measured thickness of the ice tongue indicates reducing with a speed of 0.5–1.5 m a⁻¹ since 1981. The shrinkage of the glacier terminus is less than 2% of the total length during the last 30 years; however, the retreat of terminus position and the thinning of the ice thickness provides significant information that these glaciers on the south slope of Mt. Tuomuer are in an intensively decreasing phase in recent time.     

电子水准仪观测资料处理系统的研制

本文着眼于台站水准数字化改造的实际需要，对电子水准仪投入使用前及使用中所涉及的仪器检查项目和观测数据的后续处理工作进行二次开发，研制了“电子水准仪观测资料处理系统”。该系统包括仪器检查、观测成果处理和绘图三部分。使台站水准测量结束了人工读数、手工记录和点图、人工计算的历史，实现了电子水准仪观测资料处理的微机化和自动化。     

GPS车载导航系统技术趋势浅析

本文通过对GPS车载导航系统的构成及其国内外发展现状的分析,阐明了我国GPS车载导航系统将向信息终端融合化、交通信息实时化、信息服务平台化、数据更新网络化方向发展的技术趋势。     

电子商务与数字化企业和网络财务管理

电子商务正在以势不可挡的发展势头动摇和丰富着千百年来形成的传统贸易方式，并将成为21世纪人类信息社会的核心。面对电子商务大潮，我国企业的信息化建设（数字化企业）还处在很低的水平。当务之急，加快数字化企业的建设步伐，打好企业数字化管理基础，搞好即时、在线及财务业务协调的网络财务管理。