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1.
本文首先分析了国家宏观经济背景和居住形态的涵义,然后,着眼于20世纪后半叶我国城市居住形态的发展演变,从国家宏观经济背景变化的过程中反思和探讨二者的相互关系。  相似文献   

2.
电脑技术的作用和影响,在现代绘画艺术的发展和演变过程中不可忽视的,绘画艺术在电脑技术影响下改变着以往的知识结构,艺术框架和思维模式,不断地进行自我更新和演变,电脑技术使绘画艺术得到了充分的拓展和广阔的延伸。  相似文献   

3.
调查了数据库技术的演变过程,探讨将人工智能应用于数据库的几种技术.表明数据库发展的前景.  相似文献   

4.
汉字是世界最悠久的字之一,她已经有五六千年的发展过程,几千年来,汉字的形体经过了多次的演变,主要字体有甲骨、金、小篆、隶书、楷书,利用多媒体动画技术向读介绍中国汉字的产生及演变过程。  相似文献   

5.
本文从形态类型学视角探讨了国内语言学界少有研究的英语形态历时演变。在简要地介绍了语言类型学、形态理论及语言演变的关系之后,文章分析了从古英语到中古英语的词形变化,并说明了英语演变的原因。形态研究是语言类型学的重要内容,语言类型的演变一般体现在形态、语序和虚词三个语法变量的历时变化上。本文旨在说明古英语向中古英语的演变即屈折语向孤立语的转化过程。  相似文献   

6.
通过对古代中西方釉的种类、化学成分和制作工艺的考查及其发展和演变过程的回顾,较系统地整理了中西方釉技术的发展脉络,并分析了中西方釉技术及其发展的差异.  相似文献   

7.
在现代快节奏的工作与生活中,大众阅读时间逐渐呈现碎片化态势,而作为手机阅读一种重要阅读形态的手机杂志,满足了这种变化,并得到了快速发展。介绍了手机阅读与手机杂志发展的现状,分析了手机杂志快速发展中存在的问题,探讨了手机杂志创新与发展的思路及对策。  相似文献   

8.
海滩-沙丘系统耦合演变数学模型同时考虑近岸水沙和风沙过程,可以更好地预测砂质海岸在更大空间尺度上的地貌形态演变,为海岸带保护修复和综合管理提供依据。从概念模型、基于水沙过程的海岸地貌演变模型、海岸风沙输移模型、水沙-风沙耦合模型4个方面概述了海滩-沙丘系统耦合演变数学模型的研究进展。现有海滩-沙丘系统耦合演变数学模型可以模拟风暴作用下的海滩-沙丘侵蚀和泥沙交换、供应限制条件下的风沙输移和沙丘发育等物理过程,并初步具备多年时间尺度上的模拟能力,但在适用性、准确性和计算效率等方面仍存在不足,提出该类模型关键物理/生物过程的考虑、计算效率的提高、空间维度的拓展和实际应用的检验等今后的发展方向。  相似文献   

9.
每一种媒介的诞生都会催生一种新的文学形态,此种新型文学形态将因为承栽媒介以及时代环境等原因,呈现出与其他文学形态有所区别乃至截然不同的特性。作为现代通讯技术高度发达的产物,手机文学与时下后现代审美文化有着千丝万缕的关联,它从创作到消费的诸多特点决定了它对传统写作构成反叛,同时也对与之相似的博客文学构成超越。在这个多元时代,手机文学将与传统文学以及网络文学互相提升、互相竞争,共同营造一个和平共处、动态平衡的泛文学时代。  相似文献   

10.
应用虚拟制造技术进行手机的虚拟样机设计,可以在计算机的虚拟世界中发现和解决手机设计过程中可能出现的问题。本文采用功能分析法,根据用户需求对现有手机进行改进设计,用LTG进行概念手机的虚拟造型设计,采用快速成型技术将虚拟样机模型实物化,提出了将虚拟概念设计与快速成型技术集成的新设计理念。  相似文献   

11.
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.  相似文献   

12.
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。  相似文献   

13.
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.  相似文献   

14.
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-  相似文献   

15.
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-  相似文献   

16.
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  相似文献   

17.
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  相似文献   

18.
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  相似文献   

19.
<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  相似文献   

20.
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