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泰中罗勇工业园“园中园”模式与效益评价 总被引：2，自引：2，他引：0
“一带一路”倡议为中国产能合作与产业升级提供了广阔的空间，而境外经贸合作区则是中国与一带一路沿线国家实现产能合作的有效平台。在总结中国境外经贸合作区发展特点基础上，利用中国对泰国直接投资流量与泰国GDP数据分析双边贸易和投资，从“园中园”开发模式、区位条件、服务环境及企业特征4个方面详细探讨泰中罗勇工业园的发展模式，并采用数据包络分析方法对近年来园区发展效率进行评价。研究结果显示：① 泰中罗勇工业园是中国企业赴泰国投资兴业的第一平台，也是中泰产能合作的有效载体；② 泰中罗勇工业园采用“园中园”开发模式，是中国海外园区一个有效的发展模式；③ 2012—2018年泰中罗勇工业园园区投入产出效率较高，园区效益较好，其中，2016和2018年投入产出效率最高；基于此，总结泰中罗勇工业园对中国境外经贸合作区建设的启示：“园中园”模式完善招商环境、提高投资效率，结合自身与东道国优势、构建合作区完整产业链，实现合作区本土化、促进东道国社会经济发展。 相似文献
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Assessment of temporal and spatial variability of soil salinity in a coastal saline field 总被引：1，自引：0，他引：1
Many coastal tideland areas in southern Hangzhou Gulf in Zhejiang Province of China have been successively enclosed and reclaimed for agricultural land uses under a series of reclamation projects over the past 30 years. The variability of soil salinity was considerably great and an understanding of the temporal and spatial components of soil salinity variability is essential before decisions can be made about the feasibility of site-specific management. In this paper, a 5.35-ha field reclaimed in 1996 was selected as the study site and 112 bulk electrical conductivity (ECb) measurements were performed in situ by a hand held device in the topsoil (0–20 cm) at regular 20-m intervals across the field over a two-year period. Conventional statistics and geostatistical techinques were used to assess the spatial variability and temporal stability of soil-salinity distribution. The results indicated high coefficients of variation in topsoil salinity over the three samplings. Simple mean ECb comparison revealed that soil salinity increased from winter to spring. Kriged contour maps showed the spatial trend of salinity distribution and revealed the consistently high and low salinity areas of the field. In percentage terms, the proportions of the moderately saline class, strongly saline class, and extremely saline class were 37, 39, and 24%, respectively. Temporal stability map indicated that more than 60% of the study field was determined as the stable class. Based on the spatial and temporal characteristics, a similarity assessment map was created, which presented 5 homogenous sub-zones, each with different characteristics that can have an impact on the way the field is managed. It was concluded that saline soil land might be managed in a site-specific way based on the clearly defined management sub-regions within the field. 相似文献
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根据水电工程实际，分析了岩体各风化分带的特点，提出在用其它定性与定量相结合的方法对岩体进行风化分带之后，用有序地质量最优分割法对岩体进行弱风化亚带的定量划分．从而为水电工程准确确定建基面高程提供了较为科学的方法。将该法应用于歪头山铁矿边坡工程、岩体风化分带，获得了较好的效果。 相似文献
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干河梁岩体是中酸性复式岩体,不同岩石类型之间接触关系清楚,由早到晚其侵位顺序为石英闪长岩→英云闪长岩→花岗闪长岩→斑状二长花岗岩→黑云二长花岗岩→钾长花岗岩。岩石地球化学资料表明,该岩体与碰撞后型花岗岩相似。依据同位素测年结果,确定其侵位时代为晚古生代晚期。 相似文献
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