基于循环特性的均匀圆阵快速空间谱计算

针对在阵元数多、分辨率要求高的情况下，基于均匀圆阵的空间谱直接计算方法存在计算量大、实时性差的缺点，利用循环矩阵、离散傅里叶变换、卷积运算之间的内在联系，提出了一种快速空间谱计算方法。仿真结果表明，在保持测向性能完全一致的情况下，所提快速算法降低空间谱计算过程中角度搜索阶段的计算量随阵元数增加而增加；且在相同计算量条件下，所提快速算方法可以用于更高精度和分辨率的角度搜索。     

Tourism water footprint: an empirical analysis of Mount Huangshan

Water is an important factor for the sustainable development of tourism. We constructed a comprehensive model of the tourism water footprint (TWF), including tourism sewage and water for management, and used the world heritage Mount Huangshan as an example. The results showed that the total TWF, which included green, blue and grey water of Mount Huangshan in 2012, was about 10.19 million m³/year, approximately per tourist 3.39?m³/day or 3387?L/day. Tourism sewage and food were the main factors of water consumption. The spatial transfer of TWF led the spillover of tourism environmental impact, not only affecting Mount Huangshan but the Huangshan City and even nationwide. Tourist flow and temperature had a highly significant positive correlation with the TWF. Quantifying the TWF can reflect the pressure of tourists on water resources, and provide an effective decision-making basis for rational use of water resources.     

Residential Enclosure,Power and Relationality: Rethinking Sociopolitical Relations in Southeast Asian Cities

As in many other areas around the globe, enclosed residential spaces have proliferated in Southeast Asia since the 1990s. Recent publications have presented such gated communities as ‘porous enclaves', implying multiple socio‐spatial dynamics of movements through gates and walls. However, the enclave model does not suffice for analyzing the relational dynamics generated by enclosed residential estates. The concept of ‘ecotonal space' and social geography are used to show, in the case of Cambodia's capital Phnom Penh, that the enclosure and its borders are producers and products of multiple social, spatial, economic and political relations, both symbolic and material. Property developers assert their position as an emerging elite in the city's society and politics, a process based on different types of everyday relations they have with the inhabitants of their residential estates and territorial institutions. The enclosed residential estate can serve as a resource for deploying new power relations. Consubstantial with the neopatrimonial nature of the Cambodian economy and politics, this process is a response to the opacity and uncertainty of real estate markets and urban development.     

2004-2008年福建省制造业空间结构及变化分析

基于2008年和2004年福建省制造业产值，以县域为基本研究单元，采用K均值聚类法对66个研究单元进行聚类、合并，根据制造业集聚程度将福建省划分为核心区、中间区和外围区3个区域；并测算制造业空间结构的集中度以及产业结构调整对区域集中度变动的贡献率α和产业空间分布变动对制造业空间结构变化的贡献率β，结果表明：核心区制造业高集聚，但集中度呈下降趋势，中间区和外围区的制造业集中度有所上升，但相对缓慢；各产业类型的空间结构及变化均有较大的差异，集中度区域变动较为显著的产业主要有食品加工业、烟草加工业本地资源依赖型行业和皮革、毛皮、羽绒及其制品业等外向度高的行业；本地资源依赖型的木草加工、饮料食品业和原有发展基础影响大的设备制造业等行业的变化是影响福建省制造业空间结构变化的主要原因。     

陕西制造业投资对经济增长外溢效应的实证研究

文章使用陕西省历年相关统计数据,考察了1998-2009年制造业的投资对陕西省经济增长的贡献。用菲德模型与相关理论建立计量经济模型进行回归分析,测度陕西省制造业对经济增长的直接、间接作用与溢出效应,最后根据回归结果提出相应的政策建议。     

行业集聚度、研发投入与企业价值

本文从行业聚集度视角分析研发投入对企业价值的影响，从而检验行业聚集度对企业创新投入与价值提升的作用效果。运用2010～2015年上市公司数据实证分析行业聚集度对研发投入的影响，以及行业聚集度对研发投入价值相关性的调节作用。研究表明行业聚集度对企业研发投入具有促进作用，行业聚集度对企业研发投入价值相关性具有负向调节作用。据此研究结论，对政府与企业提出相应的建议。     

北京大都市边缘区耕地多功能评价指标体系构建——以大兴区为例

研究目的:构建基于过程的耕地多功能评价指标体系,探究耕地各功能间相关关系,并以大兴区为例加以应用。研究方法:基于"指标—过程—功能—需求"理论框架,构建基于过程的耕地多功能评价指标体系,运用指数和法、内梅罗综合污染指数法以及有机碳密度方程进行定量化评价。研究结果:(1)大兴区耕地生产、缓冲过滤功能处于中等偏下水平;(2)健康功能有进一步恶化的趋势;(3)碳固持功能较弱,且空间分异较其他三种功能更为明显;(4)碳固持和健康功能呈现拮抗关系,其他各对功能间均有一定的协同关系。研究结论:基于过程的耕地多功能评价指标体系的是可行的。     

ICT spillovers and productivity in Canada: provincial and industry analysis

Research on the effect of information and communication technology (ICT) on productivity in developed countries is already extensive, but the spillover and time-varying effects of ICT investment across economic activities have been only minimally explored. This paper investigates the impacts of ICT and its spillovers on productivity in Canada, focusing on heterogeneity across provinces and industries over time. The panel data estimation model includes 10 provinces with diverse economic activities for the period 1990–2008, and the two-digit level industries for the period 1981–2008. The findings show that ICT has a positive impact on labour productivity, but the effects vary significantly across provinces, industries, and time. Specifically, while provinces with higher shares of manufacturing and services in their GDP have reaped the benefits of ICT investment, other provinces primarily dependent on natural resources and agriculture are lagging behind. The industry-level analysis also reveals that manufacturing and services industries have benefited from ICT investment much more than primary sector industries. The results further indicate that ICT investment in the USA, a major trading partner, has spilled over to some Canadian provinces and industries and that the overall ICT effects are stabilized in those ICT-intensive provinces and industries.     

Digital technologies,knowledge spillovers,innovation policies,and economic growth in a creative region

We theoretically study the impact of two innovation policies on economic growth in a region that is creative in the sense of Richard Florida and that uses digital technologies to produce a final consumption good. The use of these digital technologies in our creative region gives rise to incomplete knowledge spillovers. Our analysis generates three salient findings. First, we characterize the balanced growth path (BGP) equilibrium. Second, we solve the social planner's problem, describe the Pareto optimal allocation of resources, and then compare the Pareto optimal allocation with the BGP equilibrium allocation. Finally, we study the impacts that a research subsidy and a particular patent policy have on economic growth in our creative region and then we relate our findings to the incompleteness of the above-mentioned knowledge spillovers.