基于行业发展与政府规制双重约束的新疆旅游业用水需求预测

首先基于旅游业行业发展和水资源管理政府规制的双重约束,设计9种情景;然后从旅游全要素视角,建立由餐饮、住宿、能源、生态、购物等5类水足迹账户组成的旅游业用水需求量预测模型;将旅游业从业人员纳入账户,提出不同情景下旅游业5类水足迹账户的预测方法;最后对2025年不同情景下新疆旅游业用水量进行了预测。研究结果表明:2025年,相较于政府规制力度和行业发展速度,新疆旅游业用水需求量对后者更为敏感;9种情景中,中/强是最适宜的发展情景,即控制游客规模以9%的速度发展,旅游业年度新增就业人员4万人,政府控制万元工业增加值用水量年均节水率7%,控制居民生活用能源增速为5.52%。     

高速PCB设计中信号完整性的仿真与分析

讨论了高速PCB设计中涉及的定时、反射、串扰、振铃等信号完整性（SI）问题，结合CADENCE公司提供的高速PCB设计工具Specctraquest和Sigxp，对一采样率为125 MHz的AD／DAC印制板进行了仿真和分析，根据布线前和布线后的仿真结果设置适当的约束条件来控制高速PCB的布局布线，从各个环节上保证高速电路的信号完整性。     

基于RapidIO的TIPC通信软件设计

将透明处理器间通信协议（TIPC）与基于高性能包交换的RapidIO总线相结合,并对RapidIO 的应用层协议进行扩展和定义,可以实现全新的基于RapidIO网络的TIPC通信软件。该软件 采用层次化和可扩展的协议来定义开放处理器间的通信协议,为各种应用提供面向消息的、 与位置无关的通信服务和标准的API函数接口,为解决多处理器、多模块和多系统互连问题 提供了方案。基于RapidIO网络的TIPC通信软件在测试中取得了良好的测试结果。     

高速铁路对长三角地区消费空间的影响

以长三角地区的南京、苏州、上海和杭州4个城市作为研究对象,通过对城际可达性变化的研究并结合针对旅客的消费问卷调查,分析了城际高速铁路对4个城市不同类型消费空间的影响。引入消费空间场强公式,探讨了城际高速铁路开通前后长三角地区消费空间的重构,即4个城市在长三角区域的消费吸引力变化。结果表明：城际高速铁路对城际文化娱乐、休闲消费空间有较大影响,对实物商品消费空间影响不大;苏州和杭州在区域中的文化娱乐休闲消费场强上升。     

主从系统自跟踪调速方案的设计与仿真

设计了一种采用单片机和变频器组成的主从系统自跟踪调速方案．首先通过高精度光栅拾取主动系统的转速信号,由单片机处理后得到转速大小．当主动系统转速变化时,通过变频控制使从动系统的转速做跟随变化．重点说明了该控制方法的基本原理和设计原理,并通过proteus对系统的硬件电路和软件程序进行仿真,表明该控制方法达到设计要求．     

Regional convergence and migration： The case of Mongolia 1989-2004

This paper investigates the convergence of GDP per capita across Mongolia＇s twenty-two aimags and five regions. According to international and domestic surveys, one third of the Mongolian population is living under the poverty line. Specifically, poverty is deeper in rural areas than in urban areas. Thus, one main objective of economic growth should be reducing the cross-regional income differences and maintaining real long-run per capita income growth. However, in Mongolia there is almost no research on regional economic development and regional income disparities. It is the first time that the speed of convergence to the steady state has been estimated, using a Mongolian cross-regional data set （1989-2004）. The results show that there is convergence across all Mongolian aimags and regions. The speed of convergence towards the steady state position is 3 percent in the Solow model and 4.3 percent in the Ramsey model. That is substantially higher than other convergence studies. The study also finds that migration has played an important role in the evolution of regional disparities.     

农村保险市场发展现状及对策研究——以湖北省恩施州为例

商业保险在农村地区经济和社会的发展中发挥着重要作用。文章以湖北省恩施州为例,分析了农村地区保险发展水平及农村保险市场存在的问题,提出从优化市场结构和产品结构、加强商业保险和政策性保险的结合、缩小地区间保险发展差距等四个方面完善农村保险市场的措施。     

Preventing motor vehicle crash injuries and deaths: science vs. folklore lessons from history

Abstract

Not long after the beginnings of motorization in the early 1900s, deaths and injuries from motor vehicle crashes became a problem in a number of high-income-countries (HIC)s, especially the United States. With the biggest problem the US led early efforts to address this issue, and for six decades these efforts were based on folklore (ie a body of widely held but false or unsubstantiated beliefs). They were not evaluated, but clearly were unsuccessful as crash deaths and injuries continued to rise. It was not until the 1970s that a broader range of countermeasures began to be adopted and was scientifically evaluated, and as a result, crash deaths and injuries declined. This history has important lessons today for many low-and-middle-income countries that have growing numbers of motor vehicle crash deaths and injuries, many of which are pedestrians and motorcyclists. This is because there continue to be advocates for many of the failed approaches (especially educational) that dominated the early efforts in HICs.     

Is faster or slower trading better? An examination of order type execution speed and costs

We examine order type execution speed and costs for US equity traders. Marketable orders that execute slower exhibit lower execution costs. Those who remove liquidity faster and pay higher trading costs transact in smaller size, spread trading across more venues, take more liquidity, and are better informed. Nonmarketable limit orders that execute slower exhibit greater adverse selection; and larger, uninformed traders who concentrate their trading in fewer venues submit them. Our findings suggest that slowing down the trading process, when faster options exist, can benefit certain market participants who seek to cross the bid–ask spread.     

Impact of walking speed on tourist carrying capacity: The case of Maiji Mountain Grottoes,China

This paper analyzes the impact of walking speed on tourist carrying capacity. To do so, a combination of simulation experimentation and on-the-ground experiment is suggested to work in a study case, Maiji Mountain Grottoes, China. The simulation findings indicate that walking speed has a negative impact on tourist carrying capacity and the correlation coefficient is 0.64, for the reason that walking takes up more space. The on-the-ground experiment shows that carrying capacity is not a unified limit all over a destination, but changeable temporally and spatially, and its estimation needs to be adjusted according to the minimum area required per tourist and tourist activity. The method applied in this paper and the simulation findings can serve as a methodological tool for further research about tourist carrying capacity where the main activity of tourists is walking while watching.