基于GIS的铁路密度空间分异研究——以新疆铁路交通网络为例

城市对外交通中,铁路是发展较早的交通运输方式。本文以新疆的铁路交通网络为依据,以道路密度为指标,利用Arc GIS的叠加分析和空间分析功能,研究新疆铁路交通网络的空间分异,并分析新疆各区域人口、生产总值差异与铁路密度差异之间的相互关系。结果表明:(1)新疆铁路密度差异显著,大体呈现"南北低中部高"的趋势;(2)新疆各地区铁路密度与人口分布、生产总值高度正相关。     

Is the protection of beach and dune vegetation compatible with tourism?

The paradox of development vs. protection and conservation of the coasts highlights the need to determine if tourism and conservation can be compatible rather than opposite activities. We analyzed the spatial and temporal changes in vegetation cover, composition and diversity in three beaches located in the state of Veracruz (Mexico) with different levels of tourism activity (Natural, Trailer Park and Hotels). We calculated tourist density and evaluated vegetation cover, species richness and diversity and analyzed the changes before and after three holiday seasons (winter, spring and summer). The Natural site had the highest vegetation cover (42.8 m²), species richness (14) and diversity (1.50), and Trailer Park the lowest (4.9 m², 8 species, and 0.897 respectively). The BACI (Before-After-Control-Design) analysis showed no significant differences before and after the holiday seasons. Our results show how low and medium density tourism can be compatible with the protection of beach and coastal dune vegetation.     

严查行贿犯罪之实体进路

行贿直接诱发受贿．是腐败产生的温床,严查行贿犯罪是当前我国遏制腐败的必然要求。从实体法上解决查处行贿犯罪面临的“瓶颈”问题是刑法本身的社会性、刑事程序的僵化性、配套法律的欠缺性和国际条约的普适性之必然选择。为此,我们应该围绕严查的标准和需求,检视现行实体法存在的诸多不足,在此基础上,从罪与刑两个方面共同着力,既要严密法网,扩大行为犯罪化,加大追诉力度,又要疏缓刑罚,实现犯罪轻刑化,增加侦破几率．以此切实达到严查行贿犯罪之目的。     

最初的萌芽——1840年-1911年中国品牌发展

清末民初西方的重要学科随着留学热潮被引入中国．上海以”海纳百川“之胸怀．孕育着品牌的成长。在这个过程中．公众开始在大众传播的导向下．有意识地进行消费与品牌认知。由于上海华洋共处的城市特征．接触西方商业文化后．市场对低技术产品的需求．使得上海具有形成轻工业品牌的先天优势。“杏花楼“、“双妹“等基于传统背景．结合适应时代的经营理念和宣传方式;”美华利”、”精益”等沿袭西方技术．从技术引入到自主生产。     

Time Changes for Lévy Processes

The goal of this paper is to consider pure jump Lévy processes of finite variation with an infinite arrival rate of jumps as models for the logarithm of asset prices. These processes may be written as time-changed Brownian motion. We exhibit the explicit time change for each of a wide class of Lévy processes and show that the time change is a weighted price move measure of time. Additionally, we present a number of Lévy processes that are analytically tractable, in their characteristic functions and Lévy densities, and hence are relevant for option pricing.     

中国省际城镇职工工资收入分布演进的时空特征

运用Kernel密度估计方法和空间马尔科夫链分析方法,并将空间因素纳入分析框架中,对1978—2009年期间中国省际城镇职工工资收入分布演进的时空特征进行了分析。研究结果表明:从时间动态性看,中国省际城镇职工工资收入的差距正逐步固化和深化,多俱乐部收敛特征明显、贫困陷阱问题日益突出;从空间动态性看,近邻效应对省际城镇职工工资收入分布演进存在一定影响,多数省份的工资收入水平向邻区的平均工资收入水平演进。     

风光互补直流LED路灯照明系统的设计

该设计采用风光互补发电、直流系统供电、LED路灯照明和单片机组成的光控时空自动控制系统,实现局部范围的风光互补自动供电照明,节约了电能,实现了绿色供电绿色照明。     

TiO2光催化氧化研究进展

本文着重介绍了光催化氧化反应的特点，TiO2的性质及光催化的原理，TiO2光催化剂的制各方法及其应用，提出目前存在的问题，对研究开发方向做了展望。