Design and Implementation of E-map Engine

随着Internet技术的飞速发展，互联网已深入世界各个角落。Internet环境下的空间信息处理技术也愈来愈受到重视，GIS的网络化应用也成为当下之热门，由此产生了WebGIS。目前世界上常用的GIS软件已达400多种。大小不一，风格各异。虽然GIS起步晚，但发展快，目前已成功地应用到了包括资源管理、自动制图、设施管理、城市和区域的规划、人口和商业管理、交通运输、石油和天然气、教育、军事等九大类别的一百多个领域。 现有的GIS系统开发工具已有很多，且功能强大，但由于它们功能涵盖面广，考虑问题的因素复杂，使得软件包变得异常笨重，针对性弱，对于特定的需求在运行效率上往往不尽如人意。再者，大多优...With the rapid development of Internet technology, the Internet has depth all over the world. Internet environment of space information processing technology is also increasing attention, GIS application of the network has become a popular present, which produced a Web GIS. The world's commonly used GIS software has reached more than 400 kinds. The size varies, the style varies. GIS lately starts,...学位：工程硕士院系专业：软件学院_工程硕士(软件工程)学号：X200823003

微囊藻毒素对水稻、高粱和玉米毒性的研究

以水稻、高粱和玉米为研究对象,考察了微囊藻毒素对受试作物的毒性差异,研究了不同浓度MC对萌发及萌发初期生长发育的影响,不同灌溉时期对受试作物生长发育的影响,检测指标包括发芽率、株高、鲜重、叶绿素、根系活力等。结果表明,受试作物对微囊藻毒素毒性并不一致,水稻发芽率受到明显抑制,高粱发芽率基本不受影响,玉米出现了低浓度促进、高浓度抑制的现象;MC对水滔、高粱和玉米的光合作用、株高和鲜重没有抑制作用,反而有一定的促进效果;不同灌溉时间条件下的研究结果表明,萌发前对高粱和玉米染毒会明显抑制植株根系活力,萌发结束后在染毒则对植株根系活力有明显的促进作用

基于区域神经网络的TFT-LCD电路缺陷检测方法

对薄膜晶体管液晶显示器(TFT-LCD)边框电路中细微、复杂的缺陷进行检测,一直是自动光学检测(AOI)的一个难点。本文提出基于改进的快速区域神经网络(Faster R-CNN)算法对TFT-LCD边框电路的缺陷进行检测。首先在共享卷积层进行特征提取,然后通过多层的区域提议网络结构生成精确候选区域,根据候选区域的特征和目标分类实现对缺陷的识别和定位。同时设计多种有效的网络结构并详细分析网络层深度及卷积核大小对检测效果的影响,最后进行不同算法的比较。在实际构建的数据集上实验,结果表明本文方法具有良好的检测效果,对6种类别的液晶屏边框电路缺陷识别定位达到平均每张0.12 s的检测速度和94.6%的准确率。福建省高校产学合作项目(2016H6026

一种基于差分进化神经网络的模糊控制方法

在模糊控制的实际应用中,隶属函数的选取往往依靠专家经验设定。这使得模糊控制由于隶属函数设定复杂,加大了实际应用的难度,往往达不到较好的控制效果。本文从RBF神经网络的特点出发,使用差分进化算法分成两个部分来优化RBF神经网络的参数,使之可以自动设置模糊控制的隶属函数。再通过模糊控制实时调整的PID控制器的三个参数,并分别对二阶系统和倒立摆系统进行仿真模拟。简化了模糊控制的设置方法,提高了进化算法在优化神经网络参数过程中的计算效率,取得了较好的控制效果。福建省高校产学合作项目(2016H6026

化工专业本科毕业生就业质量分析与就业服务研究——以厦门大学化工专业2011-2016届本科毕业生为例

近年来大学生就业形势严峻,如何提高大学生的就业质量成为就业服务工作的重点难点问题。本文以厦门大学化工专业为例,分析了该专业连续6届本科毕业生的就业质量,并结合实际工作情况,提出创新人才培养和改进就业服务的意见

硫的自述

硫,无论是元素还是化合物,都在人类的生活与生产中起着至关重要的作用。本文将硫元素拟人化,介绍了其发展史,在地球上的分布、性质以及在生活中的应用,让读者在趣味阅读中了解硫及其化合物。“化学学科拔尖学生培养试验计划”学生科研能力培养探

铝先生的诊疗

自铝第一次被化学家发现并在实验室制备至今,铝一直与人类如影随形,铝及其化合物在生产和生活中有着重要的应用。本文将铝拟人化,以\"诊疗\"的形式,采用对话体,回顾了铝的发现史和应用史。国家基础科学人才培养基金(J1310024

基于卷积神经网络的电路缺陷识别方法

电子线路上产生的缺陷由于形状不规则、边缘模糊等特点,传统图像算法难以达到高精度的检测要求。本文提出基于深度学习的卷积神经网络对电路缺陷进行识别检测。首先利用直方图均衡化对输入的图像预处理,增强对比度和清晰度,然后在8层的卷积神经网络结构上对图像进行特征提取,最后通过softmax分类器实现对图像特征的识别和分类。在实际采集的电子线路图像数据集上实验表明,本文算法具有较高的准确率,能有效识别各类电子线路缺陷。福建省高校产学合作项目(No.2016H6026

Distribution and polluting effects on Capitella capitata, Nephtys oligobranchia, Tharyx sp. on the intertidal mudflats in Shenzhen Estuary

在深圳河治理工程环境影响评估研究中 ,将 1 995年 7月至 1 998年 4月在 3个断面获得的 3种多毛类的数量进行分析 ,得出深圳河口泥滩 A断面和 RB断面的小头虫有明显的季节变化 ,即冬季数量较其他季节高 ,秋季数量较其他季节低 ,ET断面的小头虫数量没有明显的季节变化。RB断面寡鳃齿吻沙蚕数量随时间推移有增加的趋势 ,与有机质含量的变化是相似的。寡鳃齿吻沙蚕和独毛虫的水平分布明显受盐度限制 ,盐度较低的 ET断面寡鳃齿吻沙蚕数量较盐度较高的 A断面和 RB断面的低 ,独毛虫没有分布到 ET断面。 A断面的独毛虫在养猪场废水注入时大量繁殖。文中探讨了溶解氧和有机质含量与 3种小个体多毛类数量的关系。There are two famous Natural Reserve, Mai Po Marshes Reserve and Futian Natural Reserve, in Shenzhen (Deep) Bay. Deep Bay is an internationally important site for waterfowl and mangrove. Environmental stress in Mai Po and Fu Tian mudflats, induced by the accumulation of anthropogenic contaminants, such as heavy metals, poly-chlorinated biphenyl (PCB) and PAHs from industrial effluents, has aroused great concern after the Hong Kong Government declared Mai Po a wetland of international importance under the Ramsar Convention in September 1995.;High clay content, rich organic matter and high density of macrofauna are three ecological characteristics on intertidal mudflats in Shenzhen estuary. Capitella capitata, Nephtys oligobranchia and Tharyx sp. are commom species of small individual polychaete of the intertidal mudflats in Shenzhen Estuary. Capitella capitata is a worldwide species and it is considered as indicator of pollution. ;The data of three species of small individual polychaete got from July 1995 to April 1998 seasonly. Three transects including nine stations were designed for macrobenthic investigation. The study area was located in 114°00′18″E ～114°01′48″E, 22°29′51″N～22°31′66″N. Transect A includes stations A1, A2, A3 which are on the Shenzhen side of Shenzhen Bay. A3 is located near mangrove and the distances between A1 and A2, or between A2 and A3, were about 150 m. Transect RB and ET are on the Hong Kong side of the study area. Transect RB includes stations RBO, RB3 and 45O; Transect ET includes stations ET1, ET2 and ET4. Seasonal sampling was conducted in January (winter), April (spring), July (summer) and October (autumn). To collect benthic samples, a plastic core of 10 cm diameter and 20 cm length was inserted into the sediment to a depth 20cm. The sediment collected was transferred to a plastic bag and labeled with sample number. A total of five replicates were collected at each station. To wash the samples, they were transferred to a bucket and water was added. The slurry was then swung manually and then poured gently through a 0 5 mm sieve. The benthos and sand retained on the sieve were then transferred into bottle with formalin and Rose Bengal by forceps. The specimens were taken to laboratory for identification and counting under a microscope. After counting, three species of polychaete were dried in an oven at 60℃ for 48 hours. Regression analysis used the software SPSS 10.0. The seasonal variations of Capitella capitata, Nephtys oligobranchia and Tharyx sp. vary at three transects. Capitella capitata at transect A and transect RB had clearly seasonal variation. The quantities of Capitella capitata in winter were higher than that in other seasons in the same year. But there was no quantitative patterns for Capitella capitata at transect ET. There were increasing trends for the quantities of Nephtys oligobranchia at transect A and transect RB from July 1995 to April 1998, which was similar to the temporal patterns of organic matter. Regression analysis showed there was significant interrelation between the temporal patterns of organic matter and time. There was no any trend for the quantities of Nephtys oligobranchia at transect ET with the time going. The density and biomass of Tharyx sp. at transect A increased from July 1995 to April 1997, which may related to pig-cultural farms. There were many pig-culture farms near transect A before January 1997. The sewage of the pig-culture farms was discharged into the intertidal mudflat around transect A. There was no seasonal patterns for the density and biomass of Tharyx sp. at transect RB. Tharyx sp. was not found at transect ET during investigative period. ;The distributions of Capitella capitata, Nephtys oligobranchia and Tharyx sp. on the intertidal mudflats in Shenzhen Estuary were different in various transects. The average density and biomass of Capitella capitata (average value of three years) at transect A three years were lower than those at transect ET. But the average density and biomass of Nephtys oligobranchia at transec国家自然科学基金资助项目 (3 9670 1 3 5

哌啶阳离子功能化侧链型阴离子交换膜的制备

燃料电池因其能量转化率高、污染小等特点,成为当前的研究热点.然而,作为关键部件的阴离子交换膜仍然存在离子电导率低、耐碱性能差等缺点,这限制了燃料电池的发展.利用威廉姆森成醚反应在聚醚酮主链接枝哌啶鎓盐,成功制备了侧链型阴离子交换膜.设计的哌啶鎓盐通过长柔性亚甲基与主链相连,使膜内形成有利于高效离子传输的微相分离结构,PEKCQA-1.0膜在80℃的电导率高达72.7mS/cm.此外,哌啶阳离子基团离主链较远,减弱了对主链的吸电子作用;同时,环型结构的哌啶阳离子具有一定的空间位阻,减少了OH~-对阳离子基团的攻击,使膜表现出优异的耐碱性能.PEK-CQA-0.8膜在60℃下1mol/L KOH水溶液中浸泡360h后,离子电导率仅下降了8.8%,有望应用于碱性燃料电池.国家自然科学基金面上项目(21376194,21576226