单约束复合材料夹层结构轻量化设计及应用

由于复合材料夹层结构具有高强、质轻的特点,复合材料夹层结构在航天、汽车和城市基础设施等方面得到了广泛的应用。针对夹层结构受到单约束情况进行分析,对单约束夹层结构进行轻量化设计;并以某型号电动车的底盘甲板结构为对象,采用单约束夹层结构轻量化设计方法进行轻量化研究。研究结果表明在保证车辆稳定性的前提下,轻量化设计效果良好。     

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。     

The entropy weight fuzzy comprehension evaluation of enterprise knowledge competitiveness

With the constant development of knowledge-based economy, knowledge has become the core competitiveness of enterprise, which plays a vital role in the development of enterprise and market competition. It will be helpful for enterprise managers to improve their knowledge competitiveness, if they can judge the advantage and disadvantage of knowledge competitiveness reasonably. According to the nature and the characteristic of knowledge competitiveness of enterprise, a system of evaluation index has been designed about the knowledge competitiveness of enterprise. Taking the enterprise A as an example, it is appraised by using fuzzy comprehension evaluation based on entropy weight, and has provided a new idea for the knowledge competitiveness of enterprise.     

基于层次分析法的新疆城镇化水平评价

城镇化是当代世界各国经济社会发展的一个重要趋势,城镇化水平的高低是衡量一个国家和地区经济社会发展水平的主要标志。本文首先对城镇化水平的评价方法—AHP的运用原理进行了的介绍,接着选取了新疆城镇化指标体系的指标,并通过层次分析法构建起一套评价新疆城镇化的指标体系,进而运用该指标体系对新疆的城镇化水平进行了评价,最后对评价结果进行分析。     

浅谈战略管理中的SWOT分析法

在战略管理中,至关重要的一部分就是对于组织内外部环境的分析。本文论述了战略管理中的SWOT分析法。     

基于NPP-VIIRS的中国电力消费估算

针对夜间灯光数据用于估算城市电力消费量存在精度不足的问题，提出了波士顿夜光模型。选择中国大陆176个城市为研究区域，以2019年NPP-VIIRS夜间灯光产品为数据源，将第三产业作为波士顿矩阵的分类依据，将研究区城市分为明星城市、金牛城市、问号城市和瘦狗城市4类，进而估算全社会电力消费量。估算结果表明，该模型较于传统灯光模型的估算精度更高。按照相对误差的大小，将全部城市划分为高精度、中精度和低精度城市3种类型，波士顿夜光模型的高精度和中精度城市数量多于传统灯光模型，而低精度城市数量则一样多。     

输油管线的优化问题

本文针对榆油管的布置问题,运用图解法建立优化模型,并依据所给的数据,运用几何知识,计算出方案的具体解,对题目中的具体问题,建立优化模型,用lingo软件编写程序,从而得出铺设管线最省的方案.