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“城市-景区”双驱动型乡村发展:路径选择及其动态演化过程 被引量:8
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作者 刘鲁 吴必虎 《地理科学》 CSSCI CSCD 北大核心 2021年第11期1897-1906,共10页
城市溢出和景区辐射是乡村发展的重要力量,已有研究对城市周边和景区附近区位下"城市-景区"双驱动乡村的发展路径探索较少。以北京市怀柔区慕田峪村、北沟村、田仙峪村和辛营村4个行政村共同组成的"长城国际文化村"... 城市溢出和景区辐射是乡村发展的重要力量,已有研究对城市周边和景区附近区位下"城市-景区"双驱动乡村的发展路径探索较少。以北京市怀柔区慕田峪村、北沟村、田仙峪村和辛营村4个行政村共同组成的"长城国际文化村"为案例地,探索城市和景区双重优势驱动下的乡村发展路径选择及其动态演化过程。研究发现:(1)城市、景区和乡村自身等多元力量共同驱动乡村发展,继而导致其发展路径呈现出非线性、多元化的演变特征;(2)"城市-景区"双驱动型乡村的发展路径可分为"景区主导-城市辅助""城市-景区并重驱动""城市主导-景区辅助"和"城市-景区双重弱驱动"4种类型;(3)"城市-景区"双驱型乡村发展竞争性路径随着城乡、景乡间要素的差异化集聚引发了乡村产业结构变动及区域空间格局演化。 展开更多
关键词 “城市-景区”双驱动 乡村发展 城市溢出 景区辐射 长城国际文化村
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Using ArcGIS to Measure the Rate Of Radiation Exposure in Marshes Environment in Southern Iraq
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作者 Reyam Naji Ajmi 《Journal of Environmental Science and Engineering(A)》 2013年第1期21-30,共10页
Both Arc GIS 9.2 and ERDAS 9.1 software were used to analyze the concentrations in radiation exposure of marshlands in southern Iraq during June 2009 and January 2010. It was measured radiation exposure rates above th... Both Arc GIS 9.2 and ERDAS 9.1 software were used to analyze the concentrations in radiation exposure of marshlands in southern Iraq during June 2009 and January 2010. It was measured radiation exposure rates above the soil and water surface, and also measured radioactivity in the environmental models (soil, plants, sediment and water) for all the selected sites of the study area. Furthermore, it has" been measuring the level of radioactive contamination concentration of the isotope Bi-214 and Ac-228 and K-40 as well as peer-Cs-137-resulting from the operations of nuclear fission and measured the background radiation compared with other regions. Environmental samples (soil-water-plant-deposits) were taken and measuring the concentration ratio of radioisotopes in using the system account gentle rays Kama multi-channel and using the counter--Nal-tinged element--thallium--Type-WIZARD-1470 as well as a LB 1200. The results showed the regions of the marshes of radioactive contamination now. 展开更多
关键词 PLANT water soil SEDIMENT Iraq marshes radiation exposure
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