A novel approach to mapping land conversion using Google Earth with an application to East Africa

Effective conservation planning relies on the accurate identification of anthropogenic land cover. However, accessing localized information can be difficult or impossible in developing countries. Additionally, global medium-resolution land use land cover datasets may be insufficient for conservation planning purposes at the scale of a country or smaller. We thus introduce a new tool, GE Grids, to bridge this gap. This tool creates an interactive user-specified binary grid laid over Google Earth's high-resolution imagery. Using GE Grids, we manually identified anthropogenic land conversion across East Africa and compared this against available land cover datasets. Nearly 30% of East Africa is converted to anthropogenic land cover. The two highest-resolution comparative datasets have the greatest agreement with our own at the regional extent, despite having as low as 44% agreement at the country level. We achieved 83% consistency among users. GE Grids is intended to complement existing remote sensing datasets at local scales.     

分析影响隧道围岩稳定性因素

主要对影响隧道围岩稳定性的自然因素如岩石性质及岩体的结构、岩体的天然应力状态、地质构造、地下水进行了详细的分析。     

Improved J and COD estimation by GE/EPRI method in elastic to fully plastic transition zone

It is well known that conventional GE/EPRI method over-estimates the J-integral and crack opening displacement (COD)¹ in the elastic to fully plastic transition zone. The present paper investigates this issue and attempts to rectify this error. An improved GE/EPRI method is proposed with the modifications of α (Ramberg-Osgood coefficient) term in the equation of plastic J and COD. The proposed method has been experimentally and numerically validated.     

万兆以太网交换芯片设计技术

中国以IP为核心的宽带城域网建设正处于高峰阶段,给10G以太网为核心的城域以太网解决方案提供巨大的应用舞台.为了满足中国数据通信市场的需求.中兴通讯研制了10GE以太网产品.文章对这一产品进行了介绍,对其核心芯片--10GE交换芯片进行了分析,给出了芯片的功能、关键技术及芯片功能.     

基于总线的过程自动化仿真实训平台

利用先进的GE自动化系统,结合企业实际生产工艺,设计制作基于总线的沥青混凝土搅拌站仿真控制实训装置。对机、电及信息类专业实训资源进行开发,搭建了学生专业兴趣培养、工程化实践以及教师科学技术研究的基础平台,在校企合作、实践育人等方面受益匪浅。     

GE RX3i系统设计与虚拟对象应用 第3讲 GE RX3i在封口机虚拟对象中的设计

在虚拟对象中,通信方式非常简单,就是将控制层的输出数据赋给数据层的输入数据,将数据层的输出数据赋给控制层的输入数据,且数据赋值可用脚本Script编程方式实现。本文介绍了采用GE RX3i进行封口机虚拟对象的设计与应用。     

Google-Earth在中小水电防洪设计中的运用

简要介绍了Google-Earth软件的特点、功能及用途,以吐木秀克水电站工程为例,着重阐述了Google-Earth在中小水电站防洪设计中的运用,并强调了该软件在应用过程中的直观性和准确性,指出该软件能缩短工程建设周期,提高工程建设效率。     

GE90-70 PLC在循环氢压缩机C1101控制系统中的应用

本文介绍了GE90-70PLC在辽阳石化公司炼油厂循环氢压缩机C1101控制系统中的应用,在硬件配置、系统软件、用户程序生成方法及系统调试方面进行阐述。     

GE水煤浆气化炉的结构设计特点分析

分析了以水煤浆为原料的GE煤气化工艺气化炉的结构设计特点。该气化炉采用非催化部分氧化法制合成气（CO＋H2）,合成气由燃烧室（气化反应室）通过激冷环冷却进入激冷室。气化炉主要由燃烧室、激冷室、耐火衬里、激冷组件及气化烧嘴等部件组成。