基于DSRC和CDPD的先进公交系统

本文首先讲述了ITS中的2种通信技术——专用短程通信（DSRC）和蜂窝数字分组数据网（CDPD）的基本概念、工作原理及系统特点等，然后提出了一种基本这2种通信技术的先进公交系统，并对各个子系统的功能结构进行了描述。     

基于M／N检测的高距离分辨率信号的速度补偿

本文介绍了进步频率高距离分辨率信号，分析了运动速度对该高距离分辨率信号的影响，提出了基于多散射中心联合检测（Ｍ／Ｎ检测）的速度环路补偿方案。该方案使用多距离单元的联合检测完成高距离分辨率信号的最佳速率补偿，同时进一步降低目标的虚警概率，提高了目标的发现概率。     

Sediment storage and shallow groundwater response to beaver dam analogues in the Colorado Front Range,USA

Enthusiasm for using beaver dam analogues (BDAs) to restore incised channels and riparian corridors has been increasing. BDAs are expected to create a similar channel response to natural beaver dams by causing channel bed aggradation and overbank flow, which subsequently raise water tables and support vegetation growth. However, lack of funding for monitoring projects post‐restoration has limited research on whether BDAs actually cause expected channel change in the Front Range and elsewhere. Geomorphic and hydrologic response to BDAs was monitored in two watersheds 1 year post‐restoration. BDAs were studied at Fish Creek, a steep mountainous catchment, and Campbell Creek, a lower gradient piedmont catchment from May to October 2018. At each restoration site, the upstream‐ and downstream‐most BDAs were chosen for intensive study in comparison with unrestored reference reaches. Monitoring focused on quantifying sediment volumes in BDA ponds and recording changes to stream stage and riparian groundwater. Despite differences in physical basin characteristics, BDA pools at both sites stored similar volumes of sediment and stored more sediment than reference pools. Sediment storage is positively correlated to BDA height and pool surface area. However, BDAs did not have a significant influence on shallow groundwater. The lack of groundwater response proximal to BDAs could indicate that local watershed factors have a stronger influence on groundwater response than restoration design 1 year post‐restoration. Systematic, long‐term studies of channel and floodplain response to BDAs are needed to better understand how BDAs will influence geomorphology and hydrology.     

基于RVA法的河流生态需水量研究

以河流生态水文变化的指标体系（Indicator of Hydrologic Alteration,IHA）为基础,立足整体河流水文情势的流量谱系,采用变异性范围法（Range of Variability Approach,RVA）,进行基于长系列历史流量资料的河流生态需水量估算,并以山西省5条较大河流的生态敏感断面为对象进行研究。结果表明,利用本方法估算的结果是合理的,可为河流生态需水量的估算和水资源的可持续开发利用提供科学依据。     

简述周恩来的统战思想

周恩来统一战线理论思想属于毛泽东思想的一部分,早期的思想虽然不是很完善,但在实践中丰富并逐渐发展,正确的统战思想指引共产党取得了新民主主义革命的胜利。它作为一个系统化的思想体系贯穿于中国整个革命和建设事业当中,其内容相当丰富,涵盖范围也比较广。其主要内容总结概括起来包括:统一战线的任务、联合对象,领导权问题,以及统一战线的形式性质、方法、政策原则四个主要方面。     

湖南宏观经济模型与经济波动

针对湖南经济波动的剧烈程度高于全国这一事实,建立一个湖南经济波动的预警模型.同时以政府消费和出口为先决变量,以GDP、居民消费和投资为内生变量,利用3SLS法建立一个联立方程组作为湖南的宏观经济模型.模型分析表明,政府消费对GDP等重要变量的乘数效应较大,因而应加大对政府消费的调控.在此基础上,结合ARMA模型和宏观经济波动模型对2010年以前的GDP、消费和投资增长率进行预测,通过系统化分析方法量化以上变量的无警区间,结果表明湖南未来几年的GDP、消费和投资波动将趋于稳定.     

地铁正外部性作用范围的计量研究

针对地铁正外部性作用范围的问题,在总结同类研究的基础上,提出了站点周边房地产价格受到地铁的影响是通过“人”的因素而产生作用的,这种作用可通过选乘地铁的概率进行考察.本文在分析影响“人”选乘地铁的因素的基础上,构建了地铁选乘的logistic模型.通过北京市调研的数据验证模型,观察通过调整变量X4对选乘概率的影响情况得到...     

The dynamics of tourism discourses and policy in Brazil

This article employs a Foucauldian inspired discourse analysis in order to unveil hidden aspects of the tourism development policy-making process in the UNESCO Espinhaço Range Biosphere Reserve, Brazil. It identifies the emergence of different representations of tourism development and demonstrates the process of social construction of sustainable tourism as an overarching discourse, which incorporates different—sometimes opposing—representations of tourism development to gather the support of people with different backgrounds and interests. However, this research demonstrates that this flexibility caused the sustainable tourism narrative to become a vague and imprecise discourse in the context of the case study, which has been used by the regional elites to conserve the status quo, but disguised as a critical alternative perspective.     

A Histogram Matching Approach for assessment of flow regime alteration: application to environmental flow optimization

In this paper we present a Histogram Matching Approach (HMA) for assessment of the flow regime alteration. The HMA uses the degree of histogram dissimilarity as a metric for impact assessment, which is based on the quadratic‐form distance between the frequency vectors of the pre‐ and post‐impact histograms weighted by a specified similarity matrix. The HMA is coupled with an aggregated multiobjective optimization genetic algorithm and applied to a case study on the Kaoping diversion weir (Taiwan) for determining the optimal environmental flow scheme that balances the ecosystem and human needs objectives. Two key issues are addressed in this study. First, we compare the performances of the HMA and existing Range of Variability Approach (RVA). Second, we employ three types of similarity function to investigate their effect on the outcomes of the HMA. The results reveal that the HMA consistently outperforms the RVA in preserving the natural flow variability regardless of what type of similarity function is used. No single type of similarity function can be found that would simultaneously best preserve the natural patterns of 32 Indicators of Hydrologic Alteration (IHA). For the situations where the water‐supply reliability is of critical concern, the pulse similarity is recommended because it would assure the smallest water‐supply deficit. If, however, minor degradation in the water‐supply reliability may be overlooked, the linear similarity is suggested because it would generally result in the post‐impact flows that most satisfactorily resemble to the natural flow regime. Copyright © 2008 John Wiley & Sons, Ltd.     

基于IHA/RVA法的修水流域上游大型水库影响下的枯水变异研究

根据水文变异指标法及变化范围法(IHA/RVA),对江西修水流域上游两个大型水库启用日期差异进行组合,定量计算、分析了水利工程影响下的修水流域上游枯水流量的时序变异特征,探讨了水利工程建设前后导致的水文变异程度,揭示了对河流生态系统至关重要的低流量范围内多个枯水情势高改变度的存在,为水库生态调度与河流生态保护提供了有益的参考。