澳门融入粤港澳大湾区世界机场群路向研究

粤港澳大湾区世界城市群与世界机场群相伴而生、联动发展.建设世界级机场群，需要5大机场错位发展和良性互动.澳门国际机场是澳门融入粤港澳大湾区重要一极，但机场发展存在与澳门定位、香港珠海空域空运矛盾、澳门土地和环境现状等相关的问题.因此，澳门国际机场今后发展需在葡语国家航线、珠澳密切合作、公务机产业方面努力实现跨越式发展.然而，澳门国际机场改扩建问题争议不断，本文就原址扩建、填海区新建、飞地黄茅岛新建3种模式进行比较分析，探索符合澳门长远利益之方案.     

Introduction to geothermal exploration on ascension island, South Atlantic Ocean

The exploration for a geothermal resource on Ascension Island utilized a strategy that initially employed geologic mapping. On the basis of this, subsurface faults were mapped using an aeromagnetic survey. The faults were then explored using electrical resistivity surveys to define areas of potential hydrothermal fluid up-welling. The results of all of these techniques were used to site temperature gradient holes. A deep geothermal exploration well was then drilled in the area with highest heat flow adjacent to a rhyolite-to-trachyte volcanic complex.     

ZigBee网络中孤岛节点快速处理算法研究

研究ZigBee网络孤岛节点的搜索和处理,快速减免孤岛节点提高网络资源利用率。针对节点间因配置或接口协议不统一而造成孤岛节点的出现,传统的基于广度搜索的处理方法需要逐一遍历所有节点从而搜索出孤岛节点,造成搜索效率不高、网络资源利用率较低的问题。为解决上述问题,提出了基于节点帧的孤岛节点处理方法。利用ZigBee网络树型结构的特点,只有父节点中可能存在孤岛节点,因此通过判断网络节点是否为父节点并将结果保存在节点帧中,根据节点帧找到网络中有限的父节点并从中监测出孤岛节点,避免了遍历所有网络节点而造成的搜索效率不高的问题。仿真结果表明,节点帧方法能够快速搜索出ZigBee网络中的孤岛节点并作减免处理,有效提高了网络资源的利用率。     

黄河海勃湾水利枢纽对西鄂尔多斯国家级自然保护区胡杨岛的影响分析

海勃湾水利枢纽的建设、运行将对西鄂尔多斯胡杨岛旅游区产生不可逆的影响。经调查分析,胡杨岛胡杨种群分布面积为2.31 hm~2,总株数约为1 800株;胡杨种群表现出增长型特征;胡杨林总生物量为95.43 t。海勃湾水利工程运行后胡杨岛的淹没历时延长,淹没水深、淹没面积显著增加,岛北部低矮位置甚至全年淹没。胡杨部分种子可能落入水中被水流携带,丧失了种子繁殖的条件。根蘖产生的不定芽在4—6月生长期也会浸在水下,不能完成无性繁殖。胡杨幼苗树不高于2.5 m,淹没后无法生存。水库淹没将岛上以陆生生态为主的生态系统演变成以水生生态为主的生态系统,原有的旅游功能将发生变化或丧失,须采取生态补偿措施,减免工程造成的生态影响。     

基于面向对象的平潭岛大比例尺森林资源监测方法

利用高分辨率遥感影像对森林资源进行大比例尺动态监测可以有效提高林业部门对森林资源管理的时效性。以福州市平潭岛为研究区域,利用高分辨率的WorldView\|2遥感影像,结合大比例尺森林小班矢量图层,基于面向对象的分类思想,采用分层监督分类的方法,提取森林资源变化图斑,实现大比例尺森林资源的动态监测。此种方法有效利用了原始小班边界,快速提取了变化区域,总体分类精度达到了90.85%,表明利用该方法进行大比例尺森林资源变化区域提取是有效可行的。     

Nonlinear model predictive control of an internal combustion engine exposed to measured disturbances

This work presents the design procedure of a speed controller for a large, lean burn, natural gas engine in island mode operation. This is a disturbance rejection problem with a measured, large disturbance. The core element is a nonlinear model predictive control (NMPC) algorithm that serves as outer loop controller in a cascaded control structure and generates set-points for low level control loops. The NMPC relies on a control oriented model that includes the physics based equations, assumptions on underlying control loops and constraints given by the control requirements. It is shown how to design the running cost such that the stability of the NMPC without terminal cost and constraints can be guaranteed for the nominal system and for the perturbed system exposed to parametric uncertainties and un-modeled dynamics. The functionality of the control strategy is demonstrated in simulation and by experimental results derived at the engine-testbed.     

Distribution, relative abundance, and prey demand by double-crested cormorants on Manitoulin Island lakes vs. Lake Huron Coast

An aerial distance sampling survey of double-crested cormorants (Phalacrocorax auritus) was conducted in the northern region of Lake Huron (North Channel; four largest lakes of Manitoulin Island; South Shore of Manitoulin Is. facing the main body of the lake) to assess the relative distribution, abundance and prey demand by cormorants on inland lake vs. coastal habitat. On a per area basis, the density (approx. 1-2 cormorants ? km^− 2) and prey demand (approx. 1.2 kg ha^− 1) of cormorants in the four inland lakes matched that of the North Channel. The South Shore had approximately half the density and prey demand as the other two areas. Cormorants on the inland lakes of Manitoulin Island represented 13% early in the season and a high of 33% of the total population for this region of Lake Huron later in the summer. Estimating regional distributions of cormorants within the Great Lakes basin is important because mapped nest colonies and nest counts are not representative of the actual distribution of foraging cormorants during and after the nesting season. There are two general conclusions to emerge from this survey. First, aquatic productivity from both Great Lakes coast and inland lakes contributes to trends in population and distribution of cormorants in the northern region of Lake Huron and perhaps elsewhere. Second, inland aquatic ecosystems are important throughout a season for foraging cormorants from the Great Lakes and may become more important as Great Lake productivity trends downward.     

不同暴雨等级下崇明岛除涝能力评估

为支持崇明生态岛建设,在现状崇明岛水利控制工程的基础上,研究选取不同等级暴雨雨型和不同特征潮型的组合对崇明岛除涝排水能力进行计算,对预降能力、暴雨期间最高水位以及暴雨后排水时间等参数进行分析,并根据研究结果提出不同等级暴雨预报情况下调整水闸引排模式、预降水位的建议。     

采用元数据Web Service技术结合的数据共享研究

随着计算机技术的发展和信息化进程的推进,各部门的数据以令人惊异的速度增长,不同数据库管理系统存储并管理着数据,异地系统间的异构性使企业和机构间的数据访问存在诸多的不便,大大降低了信息的利用效率。针对这一情况,提出了结合元数据和Web Service技术实现数据共享问题的解决方案,充分发挥元数据在数据管理方面的特性和Web Service在分布式计算上的优势,实现共享数据的集中性管理和分布式存储,并对崇明岛生态环境数据共享平台的开发建设进行了具体的研究。     

如何解决义务教育阶段学生跨省流动问题——基于．NET的国家义务教育学籍管理系统建设方案

我国现行的义务教育阶段学生学籍管理制度,不能适应近年来人口流动增加的实际情况。地区与地区之间缺乏必要的衔接,不同系统间的信息交换也没有统一的标准,造成当前电子学籍系统陷入“信息孤岛”的泥潭。B／S下基于．NET的国家义务教育管理系统,实现了省际信息共享．解决了学生跨省流动的难题。