国土空间规划背景下的城市安全体系构建

为促进国土空间规划背景下城市安全体系的综合性与系统性,结合北京、上海、雄安等城市和地区经验,探索城市安全体系的内涵,以全生命周期视角梳理城市安全体系的内在逻辑,从总体规划、详细规划、专项规划三类规划体系入手,构建了一套面向操作层面传导落实的城市安全体系;明确了不同层面城市安全内容的定位、作用及要点,形成城市安全体系搭建...     

基于MODIS数据的2001-2018年黑龙江省林火时空分布

[目的]黑龙江省是中国重要的林业省份之一,也是受林火危害最严重的地区之一.通过遥感数据获取森林火点信息,充分了解近年来黑龙江省林火发生的时空分布格局,探索林火发生规律.[方法]根据黑龙江省2001—2018年MODIS(分辨率成像光谱仪)遥感图像的MCD64A1火烧迹地产品数据集,提取林火火点信息,结合历史火灾记录资料...     

ADINA在桩锚深基坑三维有限元分析中的应用

采用三维有限元模型,应用大型有限元软件ADINA,对沈阳中铝大厦基坑进行模拟分析。介绍了工程情况与模型相关设置,将实际监测变形值与模拟值进行比较,验证模型的可行性,通过提取后处理变形数据。考察了基坑工程的空间特性。     

Temporal and spatial distribution of tropospheric CO<Subscript>2</Subscript> over China based on satellite observations

Mid-troposphere CO₂ data retrieved by the AIRS (atmospheric infrared sounder) were validated with five ground-based stations and aircraft measurements in the Northern Hemisphere. AIRS CO₂ products show good agreement with ground and aircraft observations. The data had a monthly average accuracy better than 3 ppmv. In this study, the spatial and temporal distribution of mid-troposphere CO₂ from January 2003 to December 2008 was analyzed based on this satellite product. The average concentration of atmospheric CO₂ was higher in the Northern Hemisphere than in the Southern Hemisphere. The yearly average results show a gradual increase from 2003 to 2008. In China, the annual growth rate was about 2 ppmv/a, similar to the United States, Europe, Australia and India, but was slightly lower than Canada and Russia. Mid-troposphere CO₂ concentrations were higher over northern China than over southern areas, due to differences in natural conditions and industrial layout. There were four centers of high CO₂ concentration between 35° and 45°N over China, with low concentrations over Yunnan Province. There was a significant seasonal CO₂ variation with peak concentration in spring and the lowest concentration in autumn.     

基于VB与MO的120急救系统的设计与开发

120急救在现代城市中扮演着越来越重要的角色,快速、准确、高效的指挥决策和调度是城市急救系统实现的关键.系统从功能和技术两方面入手,在分析整合平顶山市现有120急救系统的基础上引入GIS、GPS和GSM技术,利用组件mapobjects,结合visual basic开发语言,实现对数据的空间分析和管理,建立了基于GIS的城市120急救系统,实现了信息的查询分析、最佳路径分析以及缓冲区分析功能.     

汾河流域降水量及蒸发量的空间变异性分析研究

借助于地质统计学方法对汾河流域的多年平均降雨量和蒸发量的空间变异性进行了分析,揭示了多年平均降水量和蒸发量的空间变异特征,并应用Kriging方法进行空间插值.分析结果表明,汾河流域多年平均降水量和蒸发量在不同的分割距离范围内有不同的空间相关性,多年平均降水量具有比较明显的地带性,蒸发量分布变化地带性不强.     

利用工程图学考试检验学生空间思维能力

为强化未来工程师空间几何思维能力，使其在职业生涯中能清晰准确地利用工程图样表达产品。对学生通过工程图学期末考试进行了空间思维能力测验。改变了以往考试题型和答案固定的常规，使试题呈开放性和灵活性。实践结果表明，该工程图学课程在有限学时内打破了传统的输入式教学，对拓展并激发学生的创新思维能力具有现实意义。     

Concurrent transmission with minimal SR-pair interference in WiMAX mesh networks

Performance of wireless mesh networks can be greatly improved by spatial reuse (SR), therefore, lots of algorithms have been proposed to maximize the number of concurrent transmissions. However, most methods only considered the interference brought by the sender nodes. In this paper, we study the interference model in WiMAX mesh networks and propose a minimal SR-pair interference model to perform concurrent transmissions in both uplink and downlink directions. Simulation results show that our model is more efficient and stable, i.e., it increases the number of concurrent transmissions and its performance is constant and independent of transmission directions. Biography: XIONG Qing(1978–), male, Ph. D., research direction: wireless mesh networks.     

桂东南采茶戏的变迁、特点与生存状态分析——以博白采茶戏为例

桂东南采茶戏被列入国务院颁布的第一批全国非物质文化遗产保护名录中，于是成为人们研究的对象作为桂东南采茶戏的组成部分——博白采茶戏是我们调查研究的重要对象有关资料表明，博白的采茶戏也曾历经风雨，由此可以看出广西博白的文化发展史的一个侧面，从而透视全国文化与政治的发展史。到了市场经济发达的今天，采茶戏的发展、甚至生存都面临新的严峻的挑战。对于博白采茶戏的生存状态的分析，就是为了引起社会的关注．也试图给出一些参考性的保护对策。     

桂林的城市形态演变及古建筑旅游资源探析

考查桂林的城市形态演变和古建筑旅游资源认为桂林的历代城市建设符合一般的经济、社会、文化、军事和生活对城市空间结构的优化选择规律,建筑与自然环境、文化相交融是推动桂林由军事城镇演变为旅游文化名城的重要因素,也是桂林城市建设应遵循的原则.