天山北坡经济带城镇体系分形研究

在分析天山北坡经济带城镇体系现状的基础上,定量计算了其城市首位指数、规模结构分维数和空间关联维数.结果表明,研究区城镇体系具有分形特征,城市首位度过大,发展不平衡,中心城市辐射功能较弱;空间上呈线形密集分布,并受自然条件和交通干线的显著影响,城市空间相互作用力较弱,整体功能发挥受阻.最后提出了优化城镇体系的一些合理对策.     

关于城镇体系的区域与结构研究——以湖北省宜昌地域为例

城镇体系是我国近年来城市地理和城市规划研究的重要课题之一。城镇体系的研究应主要是在区域背景研究基础上对其职能、空间和规模等三大结构的研究。据此,本文具体地分析了湖北省宜昌地域的经济社会发展对城镇体系的影响,提出了该体系结构的发展设想:(1) 建立以区域型工、矿业城镇性质为核心的职能结构;(2) 建设东、中、西均衡分布、各具特色的空间结构;(3) 加强两宜城镇群建设,组成中小结合的规模结构。     

淮安市域城镇体系结构研究

通过深入分析城镇体系的等级规模结构、职能类型结构体系、地域空间结构和网络系统结构,认为淮安市城镇体系与其经济发展水平基本协调.根据淮安市中心城市的能级较低,城镇体系发育不全,功能结构单一,城镇化水平较低且地域分布不均等特点,提出了城镇体系结构调整的构想.     

黄河金三角示范区城镇体系规模结构特征及影响因素分析

基于2000-2019年城区常住人口指标,运用金字塔模型、首位度指数、位序-规模法则、核密度分析和鱼骨驱动模型等方法对黄河金三角城镇体系规模结构特征及影响因素进行分析.结果表明：(1)从城镇数量看,整体呈现出金字塔型,但顶端缺少引领整个区域发展的大城市;示范区城区人口数目整体从金字塔型逐渐转变为橄榄型.(2)从首位度指数看,两城市首位度指数和四城市首位度指数呈直线下降趋势,十一首位度指数呈上升趋势,表明首位城市不突出且地级市辐射效果不尽理想.(3)从位序-规模法则看,空间结构和分布符合分形规律,但城镇间规模均衡度不高、联系不够紧密.(4)从集聚效应看,密集区范围呈现出不断扩大的趋势,且核心聚集区逐渐呈现以运城市、临汾市、渭南市和三门峡市4个城市为核心的集聚效应.(5)从影响因素看,政府政策、要素流动、科技进步和产业分工等4个因素的影响作用显著,并对城镇体系规模分别具有基础效应、耦合效应、驱动效应、柔性效应和共生效应的作用.     

睢宁县域城镇体系分析

在分析睢宁县域城镇体系的现状特征和预测人口与城镇化水平的基础上，规划了睢宁县域城镇等级规模结构、职能结构和空间地域结构．     

广西钦州市城镇及其发展

广西钦州市拥有 60个镇 2个乡及 4个街道办事处 ,其中建制镇 (非县城镇 ) 5 7个 ,城镇水平较高 ,但市城城镇体系存在着城镇规模结构 ,职能分工不明确、城镇个性不明显、城镇规模偏小、城镇基础设施不健全等问题 ;钦州市城城镇化发展应强化各级中心城镇的规模 ,凸现城镇的个性 ,推动区域整体发展和城乡一体化的进程 ,形成城镇网络 ,走城镇与区域可持续发展之路。     

西部地区河谷型小城镇体系的分形研究--以甘肃省临洮县为例

以西部典型的河谷型小城镇体系-临洮县域城镇体系为例，运用分形研究方法，对其规模结构、空间分布进行了研究，并对其城镇体系的优化提出了几点建议，认为河谷型城镇体系具有分形特征，其等级规模结构比较松散，呈明显的首位分布，城镇首位度大，中间城镇缺失，城镇空间体系呈明显的线状分布，主要小城镇分布在一条地理要素上，交通网络不畅达，各小城镇之间联系不紧密。     

贫困山区县城镇体系空间特征研究——以重庆市秀山县为例

根据城镇体系空间相互作用原理,运用分形理论,以位于武陵山区的国家级扶贫工作重点县重庆市秀山县为研究样本,采用关联分维数对山区县域城镇体系规模和空间分布特征进行定量分析,同时结合山区的特殊地理环境进行了县域交通网络分形分析,结果显示:山区县域城镇体系空间结构具有分形特征,城镇体系规模等级较低,中心城镇(特别是县城)首位度不高,属于低首位度城镇.对其他乡镇的带动辐射职能不够突出;城镇体系空间结构不平衡,呈现主要城镇沿交通布置;系统内部交通通达度差,制约了各乡镇之间的经济联系度.     

农牧交错带县域城镇体系规模等级与空间结构分析--以内蒙古卓资县为例

应用城镇首位度、层次聚类分析等数学方法分析内蒙古卓资县的城镇人口规模等级及空间结构.结果表明,卓资县城镇体系发育不完整,各等级城镇空间分布不平衡.据此提出卓资县城镇今后发展的对策.     

南平市域城镇体系结构的研究

分别从等级规模结构、地域空间结构和职能类型结构3个方面对南平市域城镇体系进行了研究，分析了南平市域城镇体系结构的特点及不足。提出了城镇体系结构向健康、有序方向发展的建议和对策，即强化中心城市。确立“一轴两翼，梯度推进”的发展模式，提高城镇的专业化程度等．为南平市域城镇体系规划及地区经济的可持续发展提供依据。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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