土地利用转型与乡村振兴     

龙花楼  屠爽爽 《浙江国土资源》2018,(9)

正国际著名地理学家段义孚认为:土地利用是社会的一面镜子。乡村发展进程中暴露出来的形形色色的社会经济问题均可在土地利用上得以反映,也可通过管控土地利用转型得以缓解。文章论述了土地利用转型的概念内涵,探讨了土地利用转型与乡村振兴二者之间的相互关系,以及实现乡村振兴的土地利用转型路径。土地利用转型是在经济社会变化和革新的驱动下,一段时期内与经济和社会发展阶段转型相对应的区域土  相似文献   

基于SVG的交互式房产WebGlS的研究与实现     

王元怀  时少芬 《国土资源导刊(湖南)》2005,2(5):51-52

为适应房产管理网络化发展的需求．提出了利用SVG来建立房产WebGIS的技术和方法研究了如何用SVG进行房产数据的表示、存储和查询，并在此基础上初步建立了基于SVG的房产可视化WebGIS．  相似文献   

中国县域粮食产量与农业劳动力变化耦合关系研究（英文）     

戈大专  龙花楼  张英男  屠爽爽 《地理学报(英文版)》2018,(1)

In this paper we establish a model that expresses the coupled relationship between grain yield and agricultural labor changes in China, and present a preliminary discussion of the coupled processes involved in changes in these factors at the county level. Thus, we develop two coefficients on the basis of county-level statistical data for grain yield and agricultural labor for the years 1991, 2000, and 2010, namely, the grain-labor elasticity coefficient(GLEC) and the agricultural labor-transfer effect coefficient(ALTEC). The results of this study show that during the transformation process of agricultural development in China, different kinds of coupled relationships between grain yield and agricultural labor changes co-existed at the same time. For example, between 1991 and 2010, counties characterized by three different coupled modes(i.e., increasing grain yield and decreasing agricultural labor, increasing grain yield and agricultural labor, and decreasing grain yield and agricultural labor) account for 48.85%, 29.11%, and 19.74% of the total across the study area, respectively. Interestingly, a coupled relationship between increasing grain yield and decreasing agricultural labor is mainly concentrated in the traditional farming areas of China, while a coupled relationship between increasing grain yield and agricultural labor is primarily concentrated in pastoral areas and agro-pastoral ecotones in underdeveloped western China. At the same time, a coupled relationship between decreasing grain yield and agricultural labor is concentrated in areas that have experienced a rapid development transition in agriculture, especially the developed southeastern coast of China. The results of this study also show that between 1991 and 2010, 1961 counties experienced a decline in the proportion of agricultural labor; of these, 1452 are also characterized by increasing grain yield, 72.38% of the total. This coupled relationship between grain yield and changes in the proportion of agricultural labor shows a stepped fluctuation and has continually strengthened over time. Data show that mean values for the GLEC and ALTEC increased from –0.25 and –2.93 between 1991 and 2000 to –0.16and –1.78 between 2000 and 2010, respectively. These changes in GLEC and ALTEC illustrate that the influence of agricultural labor changes on increasing grain yields has gradually diminished. Finally, the results of this study reveal that the ‘Hu Huanyong Line' is a significant boundary sub-dividing this coupled relationship between grain yield and changes in agricultural labor.  相似文献   

卫星导航用户观测数据实时模拟研究     

时爽爽  黄劲松 《测绘科学》2017,42(10)

针对卫星导航用户观测数据模拟具有高精度、高采样率、强实时性的要求,该文在研究卫星导航定位系统工作原理的基础上,建立了卫星导航用户观测数据实时模拟系统。详细论述了卫星导航用户观测数据模拟的原理、流程及所用到的数学模型。考虑到观测数据模拟的时间约束特性,将模拟系统划分为非实时层、弱实时层和强实时层3层结构,并采用多线程的处理方法。模拟算例结果表明:该系统具有正确性和可靠性,满足强实时性要求,适用于卫星导航用户观测数据模拟。  相似文献   

本刊启事     

为适应我国信息化建设需要  扩大作者学术交流渠道  本刊已加入《中国学术期刊 《四川地震》2001,(1):26

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SEED格式地震数据的快速转换软件   总被引：4，自引：1，他引：4  

王秀娟  和跃时  武利华 《地震地磁观测与研究》2001,22(5):42-47

目前CDSN台站的设备配置采用IRISGSN的标准，它的功能之一是能够直接生产出国际流行的SEED格式数据。SEED格式以其数据编排科学合理在地震学界广为应用。拥有生成SEED格式的地震数据的功能。则在地震数据管理方面向国际接轨迈进一大步，也使我国地震工作者能够得到更好的数据服务，从而促进了地震科学研究。  相似文献   

ICP—质谱法和石墨炉原子吸收光谱法测定灰化...     

Hall  GEM 时艳 《物探化探译丛》1991,(5):42-50

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日本九州的金矿床     

浦岛幸世  陈行时 《黑龙江地质情报》1990,(2):57-60

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辽东裂谷白云金矿载金黄铁矿Re-Os定年及其地质意义   总被引：2，自引：0，他引：2  

张朋  李斌  李杰  柴鹏  王希今  沙德铭  时建民 《大地构造与成矿学》2016,(4):731-738

白云金矿是辽东裂谷区内重要的大型金矿之一,长期以来缺少直接的年代学数据。本次对白云金矿不同矿石类型中的8件载金黄铁矿进行了Re-Os同位素定年,获得其等时线年龄为225.3±7.0 Ma(MSWD=5.8),187Os/188Os初始值为2.1±2.8。结合前人的研究成果及本次年代学研究得出:白云金矿形成于印支期,其成矿物质主要为壳源,白云金矿是与印支期岩浆活动有关的热液矿床;其形成构造背景可能为受蒙古–鄂霍次克大洋向南北两侧俯冲之后的陆内后碰撞造山环境。本次研究也为今后在辽东裂谷区寻找与印支期岩浆活动有关的矿床提供了依据。  相似文献   

岩石矿物中锆的测定方法研究     

时晓露  马玲  刘瑱  朱炳文 《安徽地质》2016,26(2):158-160

测定岩石类样品中的Zr含量,酸溶经常结果偏低,碱溶通常较难获得较低的检出限。本文选取了不同岩性的岩石类国家标准物质GBW07104、GBW07106、GBW07107、GBW07114、GBW07835、GBW07836、GBW07837作为实验样品,分别采用酸溶后复溶、Na2O2碱熔、赶硅后Na2CO3和Na2B4O7三种前处理方法,对电感耦合等离子体质谱仪进行参数优化后上机测定,结果表明:对样品赶硅后加入少量Na2CO3和Na2B4O7混合试剂高温熔融处理岩石样品后,锆的测量值准确度高,而且获得了最低的检出限,同时缩短了方法流程,操作快捷。该方法更适用于各类岩石样品锆的测定。  相似文献