基于腾讯地图的北斗/GPS/GSM三定位车辆监控系统

基于腾讯地图和北斗定位系统设计了一套三定位车辆监控系统,车辆将北斗卫星导航系统作为主要定位系统,GPS导航系统和基站定位作为辅助定位系统,保证了定位信号的可靠性.监控端可通过手机客户端实时查询车辆位置信息,并可通过腾讯地图查看车辆所处的确切位置.系统具有车辆防盗功能和安全驾驶功能,防止车辆意外丢失,可提醒驾驶员已疲劳驾驶、超速驾驶等行驶安全隐患.     

东山煤矿“三下采煤”应用经验

概述了东山煤矿“三下采煤”技术发展现状、工艺流程、技术要求及发展过程中遇到的难点问题,并对“三下采煤”技术给东山煤矿带来的经济效益和社会效益进行了分析。     

三杆六脚体对桥墩周围流场影响的试验研究

为寻求保护桥墩周围河床避受冲刷的有效方式,采用物理模型试验的方法,对三杆六脚透水架体对桥墩周围流场水力特性的影响进行了研究分析。结果表明,三杆六脚透水架体不但能削减穿越其内部的水流流速,在床面附近形成流速减速区域,将墩周马蹄形旋涡和墩后尾流漩涡的作用能量有效地转移到远离床面的水体中,而且还能利用自身扰流消能和实体抗冲的双重特性有效抑制墩前向下水流对床面的冲击。     

Spatial and functional relationships between air conduits and blood capillaries in the pulmonary gas exchange tissue of adult and developing chickens

The documented data regarding the three-dimensional structure of the air capillaries (ACs), the ultimate sites of gas exchange in the avian lung is contradictory. Further, the mode of gas exchange, described as cross-current has not been clearly elucidated. We studied the temporal and spatial arrangement of the terminal air conduits of the chicken lung and their relationship with the blood capillaries (BCs) in embryos as well as the definitive architecture in adults. Several visualization techniques that included corrosion casting, light microscopy as well as scanning and transmission electron microscopy were used. Two to six infundibulae extend from each atrium and give rise to numerous ACs that spread centrifugally. Majority of the ACs are tubular structures that give off branches, which anastomose with their neighboring cognates. Some ACs have globular shapes and a few are blind-ending tapering tubes. During inauguration, the luminal aspects of the ACs are characterized by numerous microvillus-like microplicae, which are formed during the complex processes of cell attenuation and canalization of the ACs. The parabronchial exchange BCs, initially inaugurated as disorganized meshworks, are reoriented via pillar formation to lie predominantly orthogonal to the long axes of the ACs. The remodeling of the retiform meshworks by intussusceptive angiogenesis essentially accomplishes a cross-current system at the gas exchange interface in the adults, where BCs form ring-like patterns around the ACs, thus establishing a cross-current system. Our findings clarify the mode of gas exchange in the parabronchial mantle and illuminate the basis for the functional efficiency of the avian lung.     

220kV变电站三相短路电流计算及结果应用

文章阐述了220 kV变电站的三相短路电流计算的重要性,并结合工程实例介绍了三相短路电流的计算过程及计算结果在变电站设计中的应用.     

基于高校的三网协同策略研究

WLAN、LTE和有线宽带都是高速宽带的实现方式,本文以高校为切入点．重点从业务协同和网络协同2个方面,对三网的协同策略进行探讨。     

三峡库区城镇移民就业问题分析

随着三峡工程的全面竣工,库区正式进入后续规划时代,库区移民的后期扶持是"后三峡时代"最为关键的问题之一。针对库区发展、城镇移民就业等问题,深入重庆万州、开县等地进行了调研,并在分析了城镇移民就业问题的现状、原因之后,提出了几点应对措施,以期对库区城镇移民的就业问题有所帮助。     

AMT汽车模糊三参数换挡规律研究

为了使AMT汽车自动变速器换挡能够反映路况与车况变化,更好地满足汽车换挡平顺性要求,提出了AMT汽车模糊三参数换挡控制。论文首先给出了模糊三参数换挡控制原理,接着设计了模糊三参数换挡控制器,最后给出了长安羚羊AMT轿车模糊三参数换挡仿真,并与模糊两参数换挡进行了比较。结果表明,采用模糊三参数换挡比采用模糊两参数换挡更加符合驾驶员的换挡经验和习惯,比传统计算法求解换挡规律更简便,易于实现,鲁棒性更强。     

基于CHRIS/PROBA数据和地面实测光谱的三峡库区水体叶绿素a浓度反演研究

使用欧空局2001年发射的小卫星PROBA所获取的CHRIS数据,结合卫星过境时的准实时地面试验数据分析,提出了一种新的半经验模型用于反演三峡库区的叶绿素a.反演的最大误差为33%,最小误差8%,平均误差22%,均在预计的范围内.考虑到实验数据与卫星过境具有6-7天的时延,可基本认为反演结果与实测值符合,并反映了叶绿素a的全局分布,反演精度满足实用要求.     

有卸货顺序约束的集装箱装载问题及算法研究

对有卸货顺序约束的三维集装箱问题进行了描述.基于禁忌规则,采用了求解该问题的模拟退火算法,设计了货物的摆放规则和序列生成方式.采用3种邻域,根据邻域的不同,构造了2种禁忌表.根据问题的特点,在模拟退火算法抽样过程中加入了禁忌规则.介绍了算法的原理,给出了具有代表性算例试验结果并且进行了分析.试验结果表明,提出的混合算法对有卸货顺序约束的集装箱三维装载问题的有效性.