基于五层十五级影像组织模型的GIS系统设计

随着瓦片数据应用模式逐渐兴起,现有的GIS系统只强调对遥感数据的处理、操作和分析,却未考虑瓦片数据的空间特性,从而造成GIS系统与瓦片数据兼容性不强、瓦片数据间交融性弱、处理瓦片数据烦琐且复杂等问题.故为了满足GIS系统对遥感瓦片数据高效的处理、分析和可视化的要求.设计并现实一种基于五层十五级遥感瓦片的GIS系统,该系统使用五层十五级遥感影像组织方式管理影像数据,并根据瓦片数据的空间特性,设计一套高效的瓦片数据处理和组织机制,提高GIS系统对遥感瓦片数据的处理速度,使得GIS系统与瓦片数据的兼容性、瓦片数据间的交融性增强.     

球状飞射物对屋面瓦片冲击效应的数值模拟

选取典型的球状混凝土飞射物,研究其对一种典型屋面陶土瓦片的冲击破坏作用.基于ANSYS/LS-DYNA平台,参考落球冲击试验方法建立冲击碰撞的有限元计算模型.选取Johnson-Holmquist-Ceramic本构模型模拟陶土瓦片材料,引入单元应变失效准则模拟瓦片破坏情况,采用显式动力学方法研究落球冲击试验中瓦片应力、应变、变形的时变机理.对冲击速度、球块质量、瓦片倾角进行参数分析,结果表明,瓦片最大等效应力与冲击速率及球块质量大致成正比,与瓦片倾角相关性不大.冲击过程是一个能量显著转移的过程,根据损伤方程计算出陶土瓦片能承受不超过34.35m·s~(-1)的来流风速下球状混凝土飞射物的冲击破坏作用.     

基于移动GIS的林区矢量数据快速可视化技术

为解决传统移动GIS在林区矢量数据可视化过程中数据请求效率低、内存资源占用高的问题,该文提出了一种适用于林区矢量数据的快速可视化策略。该策略在分析林分空间分布和外业调查人员的操作特征的基础上,采用林区多分辨率矢量瓦片数据,在移动端建立瓦片缓存策略,利用瓦片索引和要素索引,构建矢量瓦片热度指标,同时引入瓦片生命周期因素,最终实现缓存中瓦片置换。以云南省勐海县林业数据为例,利用多种可视化方法对比该文提出的矢量数据的可视化性能。实验结果表明,与传统矢量数据可视化策略相比,该文提出的策略数据请求效率高、内存资源占用少,为移动GIS中林业矢量数据的快速可视化提供了新的解决思路。     

面向遥感瓦片数据的一次全覆盖检索模式和方法

随着卫星遥感技术的飞速发展,基于瓦片模式的遥感数据应用已逐渐成为遥感数据应用领域的趋势.然而,遥感数据瓦片化应用又进一步加剧了数据规模的增长,给数据检索带来了极大的压力.面对大规模的海量遥感瓦片数据,如何高效地获取目标数据已经成为空间信息科学领域迫切需要解决的问题之一.目前主流的检索模式还是采用传统遥感数据景检索方式,该检索方式在海量遥感数据背景下,检索效率极低且操作繁琐.通过改进传统遥感数据景检索方式,提出了一种全新的面向遥感瓦片数据的一次全覆盖检索模式和方法.该方法模式优化了传统数据检索后人工挑选的效率和操作流程,并根据遥感瓦片特有检索条件,提供了一次全覆盖自动检索、空间数据分布检索和单格网时序检索等功能.实验结果表明,该方法模式能从海量遥感瓦片数据中自动、高效、便捷地检索出目标区域满足实际应用需求的遥感瓦片数据.     

基于WebGIS的遥感会商关键技术研究与实现

针对协同会商服务的特点,采用J2EE技术体系搭建开源WebGIS服务平台.从WebGIS开源技术出发,分析设计系统的架构、应用模式,并对其中的基于5层15级的瓦片结构设计和地图瓦片在OpenLayers中的加载等技术难点进行研究,进而实现会商中的群组管理、信息展示以及会话管理三大核心,从而达到遥感会商的目的.     

基于ArcMap的电子地图瓦片制作方法

介绍了采用ArcMap生产"天地图·南昌"电子地图瓦片的数据处理流程,配图以及瓦片切片的技术,其中包括POI数据预处理、数据脱密、数据抽稀、符号库及配图模板制作,地图瓦片切片等步骤,最终实现了POI数据在电子地图中科学、合理、清晰、美观地表达.在制作的过程中,总结了POI数据处理及抽稀的经验及方法,提高了电子地图编制的技术水平,为类似电子地图项目的生产制作提供了一定的技术参考.     

一元钱让"白玉兰"彩瓦称雄大上海--访德清方舟新型建材有限公司总经理顾林章

走进位于德清县钟管镇的方舟新型建材有限公司,一堆堆色彩各异的瓦片整齐地放在厂区,准备运往全国各地。 "这些名为'白玉兰'的瓦片学问很多:它们以氧化镁为主要原料,以玻璃纤维织物为骨架,综合利用了木屑、     

基于GIS的瓦片式地图切图算法的设计与实现

随着基础地理信息服务的重要性的提高,瓦片技术的应用,提高了地图的浏览、查询、地理分析等访问效率,在地图服务中得到了广泛的应用。本文利用CShape和ArcEngine进行组件式GIS二次开发,实现了瓦片地图切图工作,并在实际工作中得到了验证,取得了较好的效果。     

Hilbert索引的栅格瓦片金字塔数据存储方案

针对文件方式和关系数据库方式存储管理栅格瓦片金字塔数据存在的管理难度大、扩展性不高的问题,文章提出一种使用Hilbert编码建立索引,在Hadoop系统中存储管理栅格瓦片金字塔数据的技术方案,较好地实现了高效率的空间数据索引,存储容量动态扩充,并能降低系统建设成本。性能对比实验结果表明:所提技术方案可有效提升栅格瓦片金字塔数据建立索引、数据入库和并发查询响应性能,可为数据中心建设和海量栅格数据管理提供参考。     

Ku波段小型化超宽带一分四功分器设计

本文设计了应用于瓦片式相控证雷达的一分带状线四功分器,采用多级阻抗变换,以及蛇形布局实现了超宽带、小型化设计。通过三维高频仿真软件HFSS进行了仿真优化,并加工了实物。测试结果和仿真结果吻合,在整个Ku波段内,输入输出驻波比小于1.5,输出端口隔离度大于20d B,插损1.5d B以内,满足相控阵雷达馈电网络的指标要求。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with