Applying a modified conduit flow process to understand conduit-matrix exchange of a karst aquifer

Due to the high heterogeneity and complexity of water flow movement for multiple karst water-bearing mediums,the evaluation,effective development,and utilization of karst water resources are significantly limited.Matrix flow is usually laminar,whereas conduit flow is usually turbulent.The driving mechanisms of water exchange that occur between the karst conduit and its adjacent matrix are not well understood.This paper investigates the hydrodynamic characteristics and the mechanism of flow exchange in dual water-bearing mediums(conduit and matrix)of karst aquifers through laboratory experimentation and numerical simulation.A karst aquifer consisting of a matrix network and a conduit was proposed,and the relationship between the water exchange flux and hydraulic head differences generated from the laboratory experiments was analyzed.Two modes of experimental tests were performed with different fixed water level boundaries in the laboratory karst aquifer.The results indicate that the water exchange capacity was proportional to the square root of hydraulic head differences.The linear exchange term in the conduit flow process(CFP)source program was modified according to experimental results.The modified CFP and the original CFP model experimental data results were compared,and it was found that the modified CFP model had better fitting effects.These results showed that the water exchange mechanism between conduit and matrix is very important for solid-liquid interface reaction,water resource evaluation,and understanding of karst hydrodynamic behavior.     

《遥感与GIS综合》课程教学改革与实践

本文结合《遥感与GIS综合》课程的具体实践,从课程的教学内容体系构建、教学方法和考核方式等方面入手,探索如何通过这些环节的改革,促进学生创新思维和综合能力的培养,提高课程教学质量.     

应用型工科院校专业课程教学改革的研究

针对应用型工科本科院校专业课程(或专业基础课程)的教学改革进行研究,介绍了为改善专业课程(或专业基础课程)的教学效果和提高教学质量,针对专业课程(或专业基础课程)的教学内容、教学方法和教学手段、实践性教学等方面进行调整与改革的研讨情况,提出了作者的观点.     

土木工程测量课程优质教学资源建设与教学改革探索

针对土木工程测量课程教学中存在的教学资源匮乏、教材陈旧、教学方法落后的问题,建设具有自主知识产权的多媒体课件,建立内容丰富的教学网站,创新教学模式,编著新体系的土木工程测量教材,整合优质教学资源,开展四步法研究性教学,在教学实践中取得较好的效果。     

网络地图API在“地理信息系统设计”教学中的应用

本文针对"地理信息系统设计"课程的教学概况,深入分析高校开展"地理信息系统设计"教学改革的目标,阐述目前国内外各种主流的电子地图API,指导和培训学生调用电子地图API的技能与技巧,并将网络地图API应用实践引入到"地理信息系统设计"的课程教学中,促进了"地理信息系统设计"实践教学的改革。将教学研讨和应用实践紧密结合,利用新兴的各种电子地图API促进"地理信息系统设计"教学,具有充分的理论依据和实践意义。     

利用IP传输技术改造武汉数字遥测地震台网系统

介绍如何利用IP通讯协议,通过Internet网络,实现改造地震台站观测设备与武汉数字遥测地震台网系统的信息集成。改造后的武汉数字遥测地震台网系统,提高了数字化资料高效性,满足了科学传递运行模式的需求,降低了台网传输故障率,减少了后期维护的人力和物力的投入。     

老挝改革开放后经济发展新趋势

老挝是一个贫困的内陆国家,其经济发展指标在亚洲30个国家中名列第26位,在联合国社会经济发展指标中排行第133位,但本世纪以来,GDP持续保持在6～7%的速度增长,经济改革成效显著,为其实现在2020年摆脱贫困国家的目标奠定了良好的基础。在简略描述老挝人民民主共和国的社会经济基本特征的基础上,分析了在老挝获得较快发展的过程中,其经济结构正在从农业经济转向农业、工业经济并举的阶段,并提出老挝的持续稳定发展将面临消灭贫困、持续增长的国外投资与周边国家经济发展的挑战。     

上海基础平台遥感数据在旧区改造信息系统中的应用

遥感数据作为一种信息量非常丰富的数据类型,在许多GIS系统中却没有发挥应有的作用,这是目前上海城市管理GIS系统应用面临的一个问题。本文以上海旧区改造信息管理系统构建与应用为例,通过介绍遥感数据在该系统中的应用方式,阐述了基础平台遥感数据如何发挥其应有的作用,成为旧区改造宏观管理中不可缺少的信息源。     

中国各省区碳足迹与碳排放空间转移

减排责任的区域分解需要科学评价各地区的排放责任。碳足迹可以全面客观地评价为满足消费而进行的生产的生命周期碳排放水平, 除了生产过程的直接碳排放, 也包括生产过程中所消耗的中间产品的隐含碳排放。应用2007 年各省区投入产出模型和2002 年中国省区间投入产出模型, 定量测算了各省区的碳足迹和省区间的碳排放转移。结果显示, 各省区之间碳足迹和人均碳足迹存在显著的差异。碳足迹较大的省份为经济大省, 主要分布在北方地区;人均碳足迹较高的省份主要是北京、上海等中心城市和能源富集区域及重化工基地;中国存在着从能源富集区域和重化工基地分布区域向经济发达区域和产业结构不完整的欠发达区域的碳排放空间转移。上述结果表明, 人均碳足迹高的经济发达省份应承担较大的减排责任, 能源富集区域和重化工基地分布区域有相当一部分的碳排放是为沿海发达省份和产业结构不完整的欠发达省份提供电力、原材料等高碳产品所致, 减排责任的区域分解需要考虑碳排放空间转移的因素, 适当减轻能源富集区域和重化工基地分布区域的减排责任, 或使沿海发达省份向能源富集区域和重化工区域提供资金和技术上的扶持, 帮助这些区域提高能源利用效率, 减少碳排放。     

MOZAMBIQUE,NEOLIBERAL LAND REFORM,AND THE LIMPOPO NATIONAL PARK*

ABSTRACT. Central to its transformation from a state‐centered to a neoliberal, free‐market economy, in 1997 the Mozambican state passed a radical new land law that guarantees the rights of individuals and communities to occupy land and transfer land‐use titles, a move seen as necessary for attracting private investment. By comparing how the land law has been applied to the Limpopo National Park and several adjacent villages, I show how it has led to geographically uneven land reform. More specifically, outside the park, the law has enabled the semiprivatization of community lands, in theory protecting community land rights. However, the application of the law within the park has resulted in the further nationalization of this space, which is leading to land dispossession for communities within the park's borders. I thus show how neoliberal land reform is giving rise to a seemingly contradictory type of “neoliberal state space.”