Measuring the area of cultivated land reclaimed from rural settlements using an unmanned aerial vehicle

Journal of Geographical Sciences - Investigating and monitoring the area of cultivated land reclaimed from rural settlements is important to optimize rural land use and understand spatial patterns....     

参芪柔脉合剂对脑梗死合并颈动脉粥样硬化患者炎症因子及内皮功能的影响

目的：比较参芪柔脉合剂对脑梗死合并颈动脉粥样硬化（CAS）患者血脂、血清炎症因子和血管内皮功能及神经功能评分（NIHSS）的影响。方法：选取脑梗死合并CAS患者85例,采用随机数字表法分为2组,对照组42例采用脑梗死常规治疗加辛伐他汀胶囊治疗,治疗组43例在对照组基础上加参芪柔脉合剂治疗,疗程均为3个月。比较2组患者血脂4项、NIHSS评分、炎症因子水平、血管内皮功能、颈动脉超声检查结果及不良反应发生情况。结果：治疗后,2组患者总胆固醇（TC）、三酰甘油（TG）、低密度脂蛋白胆固醇（LDL-C）、高敏C反应蛋白（hs-CRP）、细胞间黏附因子-1（ICAM-1）、白细胞介素6（IL-6）、内皮素1（ET-1）、颈动脉内中膜厚度（IMT）、斑块Crouse积分及NIHSS评分均较治疗前显著降低,高密度脂蛋白胆固醇（HDL-C）、一氧化氮（NO）均较治疗前显著升高,且治疗组改善优于对照组,差异均有统计学意义（P＜0.05或P＜0.01）。结论：参芪柔脉合剂能改善脑梗死合并CAS患者血脂情况、降低血清炎症因子水平、改善血管内皮功能,并可减小颈动脉粥样硬化斑块,且具有较高安全性。     

基于无人机影像的空心村整治三维规划辅助设计系统研究

现有规划设计一般通过二维、平面的符号来表达,具有不直观、不形象、不利于公众参与的缺点。本文将无人机航摄和三维虚拟设计等技术集成应用于近郊区村庄规划与设计,开展空心村整治一体化规划和三维虚拟设计的实践和研究。依照真实尺度进行仿真化和模块化三维模型设计,形成空心村规划要素模型信息库,研发了空心村整治三维规划辅助设计系统,实现了在真三维环境中对各类要素进行规划设计,并可以按需求进行模型调整修改,为空心村规划整治提供了帮助。     

基于Web GIS的城镇近郊区空心化村庄信息系统的开发与设计

农村空心化发展和大量"空心村"的涌现,已成为我国扎实推进新农村建设和统筹城乡协调发展面临的阻碍之一。为了防止城乡空心化在整治后再度出现,有必要对其进行科学化管理和信息化发展。本系统利用现有的GIS技术、数据库技术,与Web技术相结合,构建基于B/S模式的城镇近郊区空心化村庄信息系统。通过该系统对村庄信息进行可视化分析和管理,同时提供网络发布功能,对村庄产品、村庄特点、村庄旅游等进行推广。     

利用灰度共生矩阵纹理特征识别空心村损毁建筑物的方法

从无人机影像上快速识别空心村损毁建筑物,不仅能精确掌握损毁建筑物的位置分布,还能为实地调研提供指导材料。本文首先在试验区范围内获取建筑物影像,并对这些建筑物逐一标记。然后以单个建筑物为对象,计算纹理特征参数和光谱特征参数,选取与损毁程度正相关的参数标准化后组成特征参数向量,根据向量的可视化结果获取损毁建筑物的分布、损毁程度等信息。试验结果表明,该方法能实现从无人机影像上识别出损毁建筑物,并能对建筑物的损毁程度得到初步认识,可以有效实现高分辨率影像中空心村损毁建筑物的识别。     

地形分析中栅格中间层构建的尺度适应性

栅格中间层是指在地形分析中由DEM、DSM、矢量数据等原始数据,经过一系列栅格运算获取且可以重用的基础栅格层。本文系统研究了栅格中间层构建的尺度适应性,定义了范围、比例尺、分辨率和分析4种尺度,并确定了范围、比例尺和分辨率尺度的确定原则;特别对于分析尺度,通过地貌因子计算进行了切线、剖面曲率栅格层分析尺度适宜性试验,分析了曲率计算中适宜的算法和分析尺度,保证了地形基础因子栅格中间层具有满足分析要求的数值精度和匹配地形起伏的形态精度。     

The surge-like eruption of a miniature filament associated with circular flare ribbon

We present a study of a mini-filament erupting in association with a circular ribbon flare observed by NVST and SDO/AIA on 2014 March 17. The filament was located at one footpoint region of a large loops. The potential field extrapolation shows that it was embedded under a magnetic null point configuration. First, we observed a brightening of the filament at the corresponding EUV images, close to one end of the filament. With time evolution, a circular flare ribbon was observed around the filament at the onset of the eruption, which is regarded as a signature of reconnection at the null point. After the filament activation, its eruption took the form of a surge, which ejected along one end of a large-scale closed coronal loops with a curtain-like shape. We conjecture that the null point reconnection may facilitate the eruption of the filament.     

The Formation of a Small-Scale Filament After Flux Emergence on the Quiet Sun

We present observations of the formation process of a small-scale filament on the quiet Sun during 5?–?6 February 2016 and investigate its formation cause. Initially, a small dipole emerged, and its associated arch filament system was found to reconnect with overlying coronal fields accompanied by numerous extreme ultraviolet bright points. When the bright points faded, many elongated dark threads formed and bridged the positive magnetic element of the dipole and the external negative network fields. Interestingly, an anticlockwise photospheric rotational motion (PRM) set in within the positive endpoint region of the newborn dark threads following the flux emergence and lasted for more than 10 hours. Under the drive of the PRM, these dispersive dark threads gradually aligned along the north-south direction and finally coalesced into an inverse S-shaped filament. Consistent with the dextral chirality of the filament, magnetic helicity calculations show that an amount of negative helicity was persistently injected from the rotational positive magnetic element and accumulated during the formation of the filament. These observations suggest that twisted emerging fields may lead to the formation of the filament via reconnection with pre-existing fields and release of its inner magnetic twist. The persistent PRM might trace a covert twist relaxation from below the photosphere to the low corona.     

VB与VC＋＋环境下基于MapX的二次开发比较

VB、VC是基于MapX常用的GIS二次开发环境,本文以添加地图对象、加载数据集、创建标准工具栏和数据绑定等为例,比较分析了VB、VC环境下利用MapX开发的不同,得出了VC更注重程序的效率,而VB更强调易用性的概括性结论,为MapX开发平台的选择提供了有效的帮助。     

地理标记语言的通用型地理信息服务平台

地理信息公共服务平台(以下简称公共平台)是推进地理信息资源共建共享和转变地理信息服务方式的基础平台。针对地理标记语言(GML)在描述、存储、传输、解析地理信息数据方面较强的可理解性,该文提出以GML数据层、GML服务器为支撑的4层技术架构的通用型地理信息公共服务平台。重点研究其逻辑模型、总体架构、服务层设计,阐述了GML服务器与公共平台的关系,最后以数字驻马店为例验证了该公共平台设计的可行性。