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Search Results: 1 - 10 of 96414 matches for " 黄宁 "
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兰州大学西部灾害与环境力学教育部重点实验室简介

力学进展 , 2010, DOI: 10.6052/1000-0992-2010-3-J2010-032
Abstract:
浅析图书分级对儿童阅读的影响

图书馆工作与研究 , 2015,
Abstract: ?本文以分级阅读对培养儿童良好的阅读习惯和如何指导父母为孩子选择适合的图书为切入点,介绍了分级阅读的基本概念和国外分级阅读的发展情况,分析了图书分级阅读对孩子们阅读培养的重要性。
卷材涂料行标工作会议在常州召开

涂料工业 , 2005,
Abstract: ?应相关卷材涂料生产企业和使用单位的要求,全国涂料和颜料标准化技术委员会组织申报了制定《卷材涂料》的化工行业产品标准的立项报告,计划于2005年完成报批。
常用分析仪器在涂料用树脂研发中的应用(二)

涂料工业 , 2007,
Abstract: ?介绍了几种分析仪器的适用范围、分析方法,并举例说明这些仪器在涂料用树脂的研发、生产及应用中的作用。
常用分析仪器在涂料用树脂研发中的应用(一)

涂料工业 , 2007,
Abstract: ?介绍了几种分析仪器的适用范围、分析方法,并举例说明这些仪器在涂料用树脂的研发、生产及应用中的作用。
基于GA优化的九寨沟遗产旅游可持续发展研究
Study on the Sustainable Development in Heritage Tourism of Jiuzhaigou Based on Genetic Algorithm Optimization
 [PDF]

, , 孙克勤
Geographical Science Research (GSER) , 2013, DOI: 10.12677/GSER.2013.22005
Abstract:
世界遗产代表着最有价值的自然景观和人文景观,是人类共同的宝贵财富。遗产旅游作为国际性的广域旅游活动已成为人类求取与外部世界高度和谐的最有效形式之一,研究遗产旅游的可持续发展变得尤为重要。本文以九寨沟为例,首先构建了九寨沟遗产旅游可持续发展评价的4大类(旅游经济与市场开拓能力,环境保护能力,遗产旅游基础资源,旅游软、硬件环境)与28个具体指标;然后运用非线性模型,结合MATLAB的遗传算法工具箱进行实例分析;最后得出九寨沟分类可持续发展能力与综合可持续发展能力等级。结果表明,所构建的非线性模型具有广义的普适性与可操作性,能够对九寨沟遗产旅游的可持续发展提供合理的改进。
World Heritage properties represent the most valuable natural and cultural landscapes, they are the common wealth of all mankind. As a worldwide phenomenon, heritage tourism has become one of the most effective forms for people to be in great harmony with the outside world. The research on sustainable devel-opment of heritage tourism is also of great significance. Jiuzhaigou UNESCO World Heritage site is selected as the research area in this paper. Firstly, an indicator system including 4 sorts (tourism economy and market development capability, environment protection ability, basic resources of heritage tourism, “software” and “hardware” conditions of tourism) and 28 factors is established. Secondly, this paper uses the nonlinear model in combination with the MATLAB genetic toolbox to analyze this indicator system. Thirdly, the grades of sustainable development capability of Jiuzhaigou can be worked out. The results show that the nonlinear model established in this paper is widely universal and operational, and measures can be taken to improve the sustainable development level of Jiuzhaigou according to the analysis.
基于主成分指标的西湖文化景观保护与旅游发展相关性研究
A Correlation Research of the West Lake Cultural Landscape Protection and Tourism Development—Based on the Principal Component Index
 [PDF]

,, 孙克勤
Sustainable Development (SD) , 2013, DOI: 10.12677/SD.2013.33011
Abstract: 世界文化景观遗产是人类优秀文明成果的代表。随着世界遗产与旅游的结合越来越紧密,这些遗产地逐渐成为旅游发展的“招牌。本文首先介绍了世界文化景观遗产的现状,以及我国杭州西湖文化景观的遗产资源。然后采用相关分析法分析环境保护支出与旅游发展的关系,其中采用了主成分分析法将指标进行降维处理。最后得出西湖旅游发展与环保成本成正比的结论。因此,今后遗产地发展旅游的同时,更要重视环境代价。
It is recognized that the World Heritage Cultural Landscape presents the outstanding civilization achievements of human beings. As the relationship of World Heritage and tourism is more and more close, the World Heritage Sites are gradually used as “the selling points” of tourism industry. This thesis firstly introduces the current situation of the World Heritage Cultural Landscape and summarizes the heritage resources of the West Lake Cultural Landscape of Hangzhou. Then, the study applies Correlation Analysis in examining the relationship between tourism development and environmental protection expenditure, in which the Principal Component Analysis (PCA) will be employed as indicators for dimension reduction. Finally, a conclusion will be drawn that the tourism development is in direct proportion to the environmental protection expenditure. Therefore, we should attach great importance to the environmental costs in the tourism devel- opment of heritage sites.
荒漠:一般是诱惑,一般是威胁
永明
科技导报 , 2007,
Abstract:
关于μ俘获中有效赝标量耦合项的符号
周光召,
物理学报 , 1960,
Abstract: 最近的实验有迹象表明,μ俘获中有效赝标量项的符号与从V-A理论用色散关系求得的相反。本文对这个符号的差别提出了一个可能的解释。在本文中指出,汉密顿量中一很小的赝标耦合项(约为有效赝标耦合项的1/100)即能改变有效赝标耦合项的符号。将这一赝标项加以变换,使之成为普适赝矢量电流的一部分,则可证明新添的这一项对β衰变和π→e+v衰变不产生任何可观察的效应,因而不破坏V-A理论的普适性。文章最后讨论了超子对对有效赝标项符号的影响的问题。
论π介子光致产生过程的分波分析中的不定性

物理学报 , 1964,
Abstract: 自从南氏发现π介子与核子散射中的著名的南氏不定性后,不少作者研究了各种弹性过程的分波分析中的运动学不定性,并给出了相应的物理解释。对非弹性过程迄今还没有进行仔细的研究。作为第一步,并为了实际上的目的,本文讨论π介子光致产生过程的分波分析中的不定性。 跃迁振幅可以写成如下形式:
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