城市居住区详细规划中的生态设计

首先提出在居住区规划中进行生态设计的理念及这一设计要依据的原則和生态学原理,然后概括出其涉及的主要内容与具体设计方法.     

西秦岭李子园碎石子斑岩型金矿床地质特征及成矿时代

西秦岭李子园碎石子金矿床受闪长玢岩脉和断裂破碎带的双重控制,矿体上部主要产于闪长玢岩脉附近的断裂破碎带中,矿体下部产于闪长玢岩脉内部;矿石中金属矿物主要为黄铁矿、黄铜矿、方铅矿;黄铁矿为主要的金、银的载体矿物,矿石以细脉-浸染状、细脉-网脉状构造为主,具有斑岩型矿床的蚀变类型特点.矿区与成矿有关的正长斑岩和闪长玢岩的锆...     

PID控制器在农村供水工程控制系统中的应用-以红谷田水库为例

当前,我国农村用水粗放现象较为普遍,节水型生产和生活方式尚未建立.通过对取用水单位及其供水对象加强供水计量设施的自动化建设,并提高水源自动化监控能力,是缓解资源性缺水与工程性缺水的有效措施,对深化农村节水降损具有十分重要的意义.本文介绍了PID比例、积分、微分控制技术,采用临界比例度法现场调试整定PID控制器参数,实现...     

Assessment of sealed fire states by fire characteristic

The paper presented assessment of sealed fire states in underground coal mines by so-called ＂fire characteristic＂, which graphically described tendencies of fire gas components - oxygen, nitrogen, carbon dioxide, carbon monoxide and hydrocarbons - in time. In order to mark gas components tendencies in time the authors applied the time series analysis. The case studied confirmed, that analysis of fire gas components tendencies in time and their correlation allow to elicit proper conclusions about fire state assessment. Assessment of fire states based on single value of fire indexes without considering their trends in time and correlation between trends of gas components would give wrong results. The suggested method can appropriately indicate fire states in a sealed area.     

基于GIS的山地平整三维定量分析技术与应用——以福建长汀河梁开发为例

综合运用GIS、CAD等专业软件及相关分析模块,建立了一种山地平整三维定量分析技术。该技术首先运用整体法试算趋近,确定山地设计标高,实现了填挖方的平衡;然后,引入地形特征线方法划分梯台来进行规划设计;最后,结合实证区对多方案进行成本核算与比选,并提出了推荐方案的分片分步实施步骤。本文研究表明：该方法简化了传统计算方式,改变了方格网、三角网式人为划分进行多梯台平整的方法,使规划分析决策更为科学,有效地提高了项目实施的可行性,为今后山区城市山地平整开发提供新的方法与实践借鉴。     

基于子聚类约简支持向量机的说话人识别研究

由于支持向量具有边界性,在利用语音训练集对基于支持向量机（SVM）的说话人识别系统进行训练之前,需要对该训练集进行约简。考虑到该训练集一般十分庞大且具有非线性可分的特性,提出子聚类约简的概念。首先对训练集进行模糊核子聚类并过滤掉非边界的聚类区,然后依照提出的算法对保留的聚类区中的向量集做进一步地约简,使支持向量集更加集中在边界。理论和实践表明,经过两层的约简既保留了充足支持向量,保证了SVM良好的泛化性能,又提高了系统的时间和空间效率。     

一种基于特定领域的可信构件度量模型

基于构件的软件复用是提高软件生产率和软件质量的有效途径,并在计算机系统中得到了广泛的应用。随着软件质量需求的提高,可信构件的研究也越来越受重视。构件的可信度决定了软件质量的高低,只有高可信度的构件才能够满足高质量软件的需求。因此,本文基于ISO/IEC25010软件质量模型,并结合构件本身的质量特性及其所应用的领域特性,建立一种基于某个特定领域的可信构件度量模型。在此基础上深入探究其度量指标的分析及选择过程,并用形式化的方法描述该模型的可信性。      

Connectivity of core habitat in the Northeastern United States: Parks and protected areas in a landscape context

The exurbanization process, particularly rural residential development, is reducing the amount of roadless areas and remote habitat across the nation, with implications for biodiversity and ecosystem integrity of parks and protected areas. The need for connecting protected areas via existing habitat centers, or relatively undisturbed core areas, is greater than ever as exurbanization expands. Our objective was to make use of nationally available data sets on roads as well as information derived from satellite imagery, including impervious cover of the built environment and forest canopy density, to identify core habitat of the northeastern and mid-Atlantic USA. The identified core habitat areas, which covered 73,730 km² across 1177 discrete units, were stratified in terms of land ownership and management, and then analyzed in a landscape context using connectivity metrics derived from graph theory. The connectivity analysis made use of a suitability surface, derived from the land cover information, which approximated the costs incurred by hypothetical animals traversing the landscape. We show that protected areas are frequently identified as core habitat but are typically isolated, albeit sometimes buffered by adjacent multi-use lands (such as state or national forests). Over one third of the core habitat we identified has no protection, and another 42% is subject to motorized recreation or timber extraction. We provide maps showing the relative importance of core habitat areas for potentially connecting existing protected areas, and also provide an example of the vulnerability of connectivity to projected future residential development around one greater park ecosystem.     

基于GPGPU的海量山地地形数据的实时绘制算法

针对山地地形海量数据的特点,基于GPU的Geometrical Clipmap算法,应用简化的工作流程,结合GPGPU技术,采用了一种更为合理的高程数据组织交换模式,通过引入高程误差数据巧妙地解决不同分辨率之间的裂缝问题,并对高分辨率的遥感影像作为地形纹理的实现方法加以补充,进而实现可应用于虚拟现实系统的海量地形数据的实时可视化.     

山区城市WCDMA的网络规划与仿真设计

山区城市具有市区地势低平,周边高的地理特征,而相应也具有复杂的无线传播环境,研究无线网络规划一般原则的基础上,针对山区城市进行WCDMA的网络规划仿真设计,并对仿真结果进行了分析.