排序方式: 共有21条查询结果,搜索用时 15 毫秒
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如何通过规划引导推动自主创新驱动地区更好发展是规划学界的热点问题。以对城市与区域创新的互动关系以及深圳自主创新的核心特征的分析为基础,并基于自主创新视角梳理华为科技城的现状特征,识别制约创新体系完善的3个核心问题,并提出以支持创新体系培育的空间框架为基础凝聚动力、优先保障不同阶段高新企业空间需求、提高城市环境品质促进产城融合发展等3个规划重点,以规划引导片区发展来解决核心问题,助推片区自主创新体系的完善。 相似文献
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大型海藻细基江蓠制备活性炭的研究 总被引:3,自引:0,他引:3
以大型海藻细基江蓠为原料制备活性炭,通过正交实验考察了浸渍比(磷酸与细基江蓠粉的质量比,下同)、漫渍时间、活化温度和活化时间对活性炭制备的影响,同时采用红外光谱对活性炭产品的表面官能团进行了分析。确定最佳工艺条件为:浸渍比1:1、浸渍时间9h、活化温度400℃、活化时间50min,在此条件下,活性炭的碘吸附值为1049.75mg·g-1、亚甲基蓝脱色力为123mI。·g-1、得率为37.7%。红外光谱分析表明,活性炭表面存在多种官能团。 相似文献
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石材旋梯加工历来是行业内极高难度的一项内容,从工地现场放样,到加工单制作,再到实际生产都具有非常高的难度,尤其是对于生产加工。传统的石材旋梯加工时,一直采用手工制作扭曲面,对劳动者有极高的专业素质要求,质量不能得到很好的保证,并且费时、效率低下、产品尺寸误差大、产品易崩边。 相似文献
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拆除重建类城市更新的改造模式和困境对比 总被引:1,自引:0,他引:1
拆除重建类城市更新是超大城市释放土地潜能、优化城市结构、提升城市功能及破解发展瓶颈的主要途径之一。文章首先从多阶段微观博弈视角总结比较了深圳和北京的更新改造模式,并对不同模式的利弊及所面临的困境进行了剖析;其次提出市场主导的深圳更新模式宏观可控、微观高效,有利于快速推进城市更新,并形成了持续推进、动态博弈的制度优化系统,但是存在"挑肥拣瘦"、拆赔标准抬升及突破规划刚性等负外部性不断累积的困境;而政府主导的北京改造模式以"规划稳定和资金平衡"为前提,能有效保证规划落地实施和统一的安置标准,但是面对巨量的更新需求存在更新覆盖不足、可持续性差等困境;最后给出政府与市场共同参与的城市更新模式的改进建议。 相似文献
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With the rapid increase of the number and influence of floating population in China,it is urgently needed to understand the regional types of China's floating population and their spatial characteristics. After reviewing the current methods for identifying regional types of floating population, this paper puts forward a new composite-index identification method and its modification version which is consisted of two indexes of the net migration rate and gross migration rate. Then, the traditional single-index and the new composite-index identification methods are empirically tested to explore their spatial patterns and characteristics by using China's 2000 census data at county level. The results show: (1) The composite-index identification method is much better than traditional single-index method because it can measure the migration direction and scale of floating simultaneously, and in particular it can identify the unique regional types of floating population with large scale of immigration and emigration. (2)The modified composite-index identification method, by using the share of a region's certain type of floating population to the total in China as weights, can effectively correct the over- or under-estimated errors due to the rather large or small total population of a region. (3) The spatial patterns of different regional types of China's floating population are closely related to the regional differentiation of their natural environment, population density and socio-economic development level. The three active regional types of floating population are mainly located in the eastern part of China with lower elevation, more than 800 mm precipitation, rather higher population densities and economic development levels. 相似文献
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