城市边缘区旅游开发研究综述

近年来,随着人民收入水平的提高和我国休假制度的改革,城市居民的闲暇时间增多,度假、休闲等旅游活动日益蓬勃,短途旅游逐渐成为城市居民旅游的常见方式.本文从城市边缘区的概念、城市边缘区旅游的现状、开发原因、存在问题及对策等方面对城市边缘区旅游开发的研究文献进行了整理总结,并提出了城市边缘区旅游开发的发展方向.     

中国城市边缘区空间扩展及其景观生态变化相关性研究进展

城市边缘区作为连接城市与农村的过渡地带,其特殊的地理位置使得边缘区历来成为城市空间扩展中的热点地区.通过对城市边缘区概念、特征、空间扩展及其景观生态变化的研究现状分析,提出了控制城市蔓延的两种途径用来解决城市边缘空间变化所引起的景观生态变化问题.     

“城市双修”与“三个经济”双向引导的城市边缘区控规研究——以延安市南二十里铺片区为例

基于"城市双修"(生态修复、城市修补)和"三个经济"(枢纽经济、门户经济、流动经济)概念的引入,用理论研究与实证分析相结合的方法,通过问题和目标双向引导,提出城市边缘区控规(控制性详细规划)规划策略.结果表明,"城市双修""三个经济"与城市边缘区的发展诉求相契合.通过用地整合,分类确定开发模式,并将新经济落实用地;合理组织内外交通分流,着重打造通过性景观,使城市边缘区成为城市中心区的有力补充及城市形象的展示窗口.     

徐州市城市边缘区异速增长特征研究

近几年随着中国城市化的迅速发展,城市边缘区受到广泛的关注.但对城市边缘区的研究主要集中在城市边缘区的定性描述,而对边缘区的定量界定及增长驱动力研究较少.依据徐州市1987~2008年遥感图像,运用信息熵和异速增长模型对徐中城市边缘区形成机制进行了研究.结果表明:徐州市边缘区扩张具有方向性,1987~2003年城市边缘区的扩张方向为东南方向,2003~2008年主要为北方向和西北方;基于异速增长模型人口的增长方向与城市边缘区的扩展方向基本吻合,说明人口是推动城市边缘区扩张的一个主导因素;在徐州城市边缘区扩张过程中,增加的城市用地主要来自于灌溉水田和林地,但在不同的阶段有所差异.     

海口市城市边缘区空间范围的识别研究

城市边缘区位于城市与乡村之间的过渡交接地带,是城市扩张的前沿,也是城乡建设中最具活力的地区.准确地识别城市边缘区,有助于从城乡对比的角度来衡量城市化程度及其对生态环境的影响,有利于推进城市规划学科的进展.以海口市遥感影像数据为基础,选用不透水面指数评价土地利用程度,然后运用最大熵阈值法进行图像分割,界定海口市城市边缘区内外边界,并对海口市城市边缘区空间范围进行具体识别.最后通过人口统计和归一化植被指数验证识别结果的准确性,并依据识别结果对海口市2009—2017年城市边缘区扩展状况及驱动因素进行分析研究.结果表明,海口城市边缘区扩展变化主要受到自然因素、交通和人口等因子的影响.将不透水面指数与最大熵阈值分割法相结合可以直接从遥感影像中识别出城市边缘区,这是后续对这一特殊区域特征进行研究的基础.对海口城市边缘区扩张研究,有助于促进海口市的城乡协调发展,其对海口市实现城市规划与管理的可持续发展和生态与环境的平衡发展具有重要意义.     

城市周边生态环境的可持续研究

城市周边地区,也即城市边缘区,是城市化进程中经济社会变动十分剧烈的地域实体,空间利用方式的剧烈变化导致其生态环境极具敏感性。文章在阐述城市边缘区生态环境主要问题的基础上,探讨造成其生态问题突出的根源及其与可持续发展的关系,以探求城市边缘区生态环境可持续发展的有效对策。     

城市边缘区研究综述

国外对城市边缘区的研究开始于20世纪30年代,而我国起步较晚,始于20世纪80年代后期。本文采用文献综述法,总结梳理国内外学者对城市边缘区内涵、特征、范围界定、演化过程、演化机制及其影响因素,以及我国城市边缘区存在问题的研究,并相应地提出自己的观点。     

城市边缘区旅游开发模式研究

随着城市范围的逐步扩大,城市边缘区旅游种类越来越多,文章归纳总结了我国现阶段常见的五种城市边缘区旅游开发模式,并指出其常见问题.     

城市边缘区乡村景观的规划探讨

兼具城市和农村双重属性的城市边缘区是处于城乡之间、城市和乡村的社会、经济等要素激烈转换的地带。随着城市化进程的加快,其景观生态问题和生态安全问题十分突出,出现了城市与乡村交互的界面逐渐模糊,乡村逐渐被城市所吞噬,景观格局混乱等问题。从城市边缘区的特征和功能入手,对城市边缘区乡村景观进行了特征、功能的定位分析,在此基础上探讨了城市边缘区乡村景观的整治方法以及保护措施。     

论城市边缘区生态化建设

通过阐述城市边缘区对现代城市发展的三个重要战略意义，提出建设生态化城市边缘区的构想。     

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     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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