硫磺对礼花弹花型调控作用及其安全用量探究

硫磺对礼花弹的成型、开盘面积的安全性具有重要影响。采用调整硫磺在礼花弹开球药中的比例,以及分析硫磺的物理化学性能来探讨硫磺在整个开球药中的作用机理。实验结果表明,硫磺在开球药中起着特殊"热点"的作用,作用机理主要是表面反应机理与混合反应机理的共同作用。当硫磺比例在15%-20%的安全用量范围内时,随着硫磺的增多开球药特殊"热点"不断增多,此时开球后花形更加趋于球形,开盘面积也足够大。     

Patterns of Aquatic Species Imperilment in the Southern Appalachians: An Evaluation of Regional Databases

/ For regional analyses of species imperilment patterns, data on species distributions are available from the U.S. Fish and Wildlife Service and from the state heritage programs. We compared these two different databases as sources of best available information for regional analyses of patterns of aquatic species imperilment for 132 counties in the southern Appalachians and examined patterns produced from the databases. The heritage program database contained information about a greater number of imperiled species because species need not be federally listed as threatened or endangered to be included in this database. In the southern Appalachians, about half of imperiled molluscs and about one-fourth of imperiled fish were listed as threatened or endangered; much smaller proportions of other taxonomic groups were federally listed. Most threatened and endangered species appeared on both lists, but for about 40% of the species inconsistencies exist, notably a lack of recent records in the heritage program dataset. Numbers of species in each county were significantly different between the two datasets for Georgia, Tennessee, and Virginia, where the largest number of threatened and endangered species reside. Nevertheless, some counties always appeared as centers of imperilment, and the general spatial patterns of imperilment were similar.     

高平市开化寺旅游景区客源市场分析与定位研究

以高平市旅游总体规划的客源市场定位为指导,以晋城市和高平市旅游风景区近年来的客源市场统计资料及数据为依据,结合对旅游客源市场的抽样调查,运用数理统计方法,通过分析旅游者多方面结构与特征,以及开化寺旅游景区未来旅游市场的机遇和条件,确立景区旅游市场开发定位,预测近年来的旅游市场增长态势.     

中国红色旅游经典景点空间分布格局及其影响因素异质性

红色旅游是传承革命文化、推动爱国主义教育常态化和大众化、促进革命老区经济发展的重要方式。通过构建理论分析框架系统,综合运用多种空间分析方法与回归模型,对中国公布的300处红色旅游经典景区共763个景点的空间分布格局及影响因素异质性进行研究,并提出发展模式及对策。研究表明：（1）经典景点空间分布受资源、环境、社会和经济四大子系统综合影响;（2）核心区空间分布较其他旅游景区分散,形成7个一级核心区、7个及两大连片二级核心区、低密度与较低密度区等,空间关联性差异较大,关联效应伴随空间尺度缩小而减弱;（3）空间分布影响因素异质性明显,影响程度为红色旅游资源>海拔>政策力度>坡度>交通设施>市场需求>资源联动>消费水平;（4）提出采取网络、节点、廊道、共生—联动、跨区共促等发展模式及对策。研究可为红色旅游发展与管理、跨区联合等提供科学决策依据。     

乐山大佛景区环境空气质量变化规律及污染特征研究

根据乐山大佛景区环境空气质量监测数据,分析了3种污染物的时间变化规律及污染特征。结果表明:乐山大佛景区环境空气质量相对较好,优良率在87%以上,可吸入颗粒物浓度值在低浓度水平的基础上有上升的变化趋势,达到现行国家环境空气质量标准,二氧化硫、二氧化氮的污染总体上变化不显著。乐山大佛景区与乐山市主城区地域基本形成了"景城一体"的关系,景区的环境空气质量受主城区的影响较大。     

Ranking and selecting dangerous crash locations: correcting for the number of passengers and Bayesian ranking plots

INTRODUCTION: In this paper a sensitivity analysis is performed to investigate how big the impact would be on the current ranking of crash locations in Flanders (Belgium) when only taking into account the most serious injury per crash instead of all the injured occupants. RESULTS: Results show that this would lead to a different selection of 23.8% of the 800 sites that are currently considered as dangerous. CONCLUSIONS: Considering this impact quantity, the researchers want to sensitize government that giving weight to the severity of the crash can correct for the bias that occurs when the number of occupants of the vehicles are subject to coincidence. Additionally, probability plots are generated to provide policy makers with a scientific instrument with intuitive appeal to select dangerous road locations on a statistically sound basis. Impact on industry Considering the impact quantity of giving weight to the severity of the crash instead of to all the injured occupants of the vehicle on the ranking of crash sites, the authors want to sensitize government to carefully choose the criteria for ranking and selecting crash locations in order to achieve an enduring and successful traffic safety policy. Indeed, giving weight to the severity of the crash can correct for the bias that occurs when the number of occupants of the vehicles are subject to coincidence. However, it is up to the government to decide which priorities should be stressed in the traffic safety policy. Then, the appropriate weighting value combination can be chosen to rank and select the most dangerous crash locations. Additionally, the probability plots proposed in this paper can provide policy makers with a scientific instrument with intuitive appeal to select dangerous road locations on a statistically sound basis. Note that, in practice, one should not only rank the crash locations based on the benefits that can be achieved from tackling these locations. Future research is also needed to incorporate the costs of infrastructure measures and other actions that these crash sites require in order to enhance the safety on these locations. By balancing these costs and benefits against each other, the crash locations can then be ranked according to the order in which they should be prioritized.     

环境噪声达标区最佳监测点数研究

运用数理统计方法对城市环境噪声达标区网格监测资料进行了分析研究,从而确定出小型区域环境噪声网格监测的最佳测点数