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Rock mechanical characteristics and landscape evolutionary mechanism of the slit-type Danxia landform on the Chinese Loess Plateau
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作者 MEN Huan DING Hua +5 位作者 DENG Yahong MU Huandong HE Nainan SUN Pushuo LI Zhixu LIU Yan 《Journal of Arid Land》 SCIE CSCD 2024年第10期1327-1343,共17页
Since 2015,the newly discovered slit-type Danxia landform on the Chinese Loess Plateau has become a hot topic in the field of geomorphology worldwide.However,the relationships among its formation,evolutionary mechanis... Since 2015,the newly discovered slit-type Danxia landform on the Chinese Loess Plateau has become a hot topic in the field of geomorphology worldwide.However,the relationships among its formation,evolutionary mechanism,and mechanical characteristics of its strata and rocks are not clear.In this paper,the Ganquan canyon group is used as the research object.Basic physical and mechanical indices of sandstone in the Ganquan canyon group were measured through field investigation and indoor experiments,and the deterioration trends for the mechanical parameters of sandstone in this area under the action of infiltration,acid dry-wet cycles,and freeze-thaw cycles were revealed.Lastly,the formation and evolutionary mechanism of the slit-type Danxia landform were discussed.The results showed that:(1)The sandstone in the canyon group had a low cementation degree and weak cohesive force,which was easily weakened under the action of water,resulting in a decrease in compressive strength and elastic modulus.(2)Acidic dry-wet cycles caused the mineral composition of the sandstone to be dissolved,and the micropores continued to grow and develop until new cracks were produced.Macroscopically,the compressive strength and elastic modulus of sandstone were greatly reduced,and this damage was cumulative and staged.The greater the acidity,the greater the damage.(3)As the number of freeze-thaw cycles increased,the uniaxial compressive strength and elastic modulus of the sandstone decreased continuously.During the freeze-thaw cycle process,the growth and development of cracks were primarily in fracture mode and usually developed along parallel bedding positions.(4)The interaction of tectonic activity and lithology with different weathering processes was a key factor in the formation and evolution of the slit-type Danxia landform.In conclusion,the intricate process of weathering influenced by historical climatic fluctuations has been pivotal in shaping the topography of Danxia landform. 展开更多
关键词 landscape-forming rocks mechanical characteristics landscape-forming effects slit-type Danxia landform Loess Plateau
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Conserving Agricultural Heritage Systems through Tourism: Exploration of Two Mountainous Communities in China 被引量:11
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作者 SUN Ye-hong Mary Jane DELA CRUZ +2 位作者 MIN Qing-wen LIU Mou-cheng ZHANG Ling-yun 《Journal of Mountain Science》 SCIE CSCD 2013年第6期962-975,共14页
Community plays an important role in the preservation of agricultural heritage system (AHS). Recently, many AHS have been valorized as interesting resources for rural tourism. The expectations are that tourism devel... Community plays an important role in the preservation of agricultural heritage system (AHS). Recently, many AHS have been valorized as interesting resources for rural tourism. The expectations are that tourism development (TD) can be supportive for the conservation of AHS while creating benefits for local communities. In this study, two mountainous pilot villages (Longxian and Xiaohuang) in a global conservation project for traditional agricutural systems - Globally Important Agricultural Heritage Systems (GIAHS) were selected to identify the relationship between AHS conservation and TD. The study undertook in-depth interviews, and questionnaires of village residents and informal discussions with local villagers. A t-test and a linear regression model were implemented to explore the comparative dimensions of the two communities with different geographical location, economic situation, and stage of TD. The research found some similarities and differences in the two mountainous communities during AHS conservation and TD. Firstly, AHS are preservaed well in both villages unconsiously, while the residents in Xiaohuang value more highly the heritage elements than the respondents in Longxian, and the villagers in Xiaohuang are more worried about their heritage system; Secondly, both villages expect lots of benefits from TD and they clearly perceive more positive than negative impact from tourism and thus approve TD, while the hugedifferent perception on transportation and accessibility in the two villages reflects the bottleneck of TD in Xiaohuang village. At the same time, the respondents from Xiaohuang perceive more positive and fewer negative impact from tourism than the respondents from Longxian. Thirdly, the respondents in the two villages all show positive attitudes towards participation in tourism mostly motivated by the high income expectation. The main factors to determine the community perception in two villages were also analyzed based on the data process. A location-based coneeputal framework of AHS conservation in partnership with TD at community scale is proposed at the end of the paper. The dynamics of tourism development, that could enhance a better understanding of the complex relationship between conservation objectives and tourism development are discussed. 展开更多
关键词 Agricultural heritage system Tourismdevelopment Mountainous communities ZhejiangProvince Guizhou Province China
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On the Joint Development of Tourism Economy and Culture in the Era of Big Data
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作者 Zhou Xin 《学术界》 CSSCI 北大核心 2015年第10期282-288,共7页
This paper introduces the origin and development of tourism,the cultural connotation of tourism economy,the history of cultural tourism industry,and the strategic changes of business value and economic development in ... This paper introduces the origin and development of tourism,the cultural connotation of tourism economy,the history of cultural tourism industry,and the strategic changes of business value and economic development in the era of big data.The strategy of economic and cultural joint development under the environment of ecological tourism is explored by developing the way of ethnic culture tourism and strengthening the interactive development of culture and economy.The competitive advantage of big data is analyzed and the importance of basic content and data collection is emphasized.In addition,the present situation of tourism market is evaluated and improved by constructing reasonable economic benefit analysis model. 展开更多
关键词 文化内涵 旅游经济 经济效益分析 经济发展 商业价值 旅游开发 民族文化 旅游环境
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Human Settlement Science-oriented Analysis of Rural Tourism Attraction System
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作者 ZHANG Jun LU Fengping 《Journal of Landscape Research》 2013年第3期29-31,共3页
Human settlement resources belong to tourist resources in a broad sense. Rural areas with excellent human settlements have become favorable tourist destinations. From the perspective of human settlement science, touri... Human settlement resources belong to tourist resources in a broad sense. Rural areas with excellent human settlements have become favorable tourist destinations. From the perspective of human settlement science, tourism attraction system model can be established by factors of harmony of rural ecology, harmony of rural life, harmony of rural production and harmony of rural culture. Concrete strategies for improving rural tourism attractiveness based on science of human settlements were proposed from the perspectives of optimization of ecological environment, education of original residents, upgrading of agricultural landscapes and products, and construction of rural tourism culture. 展开更多
关键词 SCIENCE of human SETTLEMENT RURAL TOURISM ATTRACTION system
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Construction of Spatial Database of Tourism Resources in the Lijiang River Basin Based on MapGIS
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作者 ZHONG Hong WANG Qiaojun HUANG Hai 《Journal of Landscape Research》 2016年第4期109-113,共5页
GIS and GPS technology was applied to construct spatial database of ecotourism resources in the Lijiang River Basin,the process of constructing database was elaborated,data collection and processing as well as specifi... GIS and GPS technology was applied to construct spatial database of ecotourism resources in the Lijiang River Basin,the process of constructing database was elaborated,data collection and processing as well as specific schemes of building graphic database and attribute database were introduced,in order to provide data support for optimizing the development spaces of regional tourism resources,regulating development activities,and realizing sustainable development of ecology,environment,tourism economy and society.In addition,this paper also offered data support for eco-environment monitoring,building tourism resource management information system and "Digital Lijiang". 展开更多
关键词 MAPGIS GPS Spatial database Ecotourism resources
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Analysis of the Dominant Types of Rural Tourism in Beijing Suburbs
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作者 FU Hua ZHANG Mingqing MENG Tiantian 《Journal of Landscape Research》 2019年第4期83-89,共7页
Taking 140 administrative villages for tourism expert diagnostic training as the object, using the minimum variance method and spatial analysis method, this paper studied leading types of rural tourism industry in Bei... Taking 140 administrative villages for tourism expert diagnostic training as the object, using the minimum variance method and spatial analysis method, this paper studied leading types of rural tourism industry in Beijing based on a comprehensive analysis of the tourism business types in the villages. The results showed that rural tourism businesses are mostly the combination of many types, dominated by picking gardens and leisure farms, and the second dominant type is the combination of leisure farm and natural village household, with the clear regional distribution. The combined-business structure and its distribution is influenced by geographical location, natural conditions and industrial investment and many other factors. Water element is an important symbol of rural tourism in the suburbs of Beijing. The newly-emerging operation modes should be concluded in the scope of new format. 展开更多
关键词 Minimum variance method BEIJING SUBURBAN TOURISM CHARACTERISTIC BUSINESS type Distribution
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Linked Data Based Framework for Tourism Decision Support System: Case Study of Chinese Tourists in Switzerland
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作者 Zhan Liu Anne Le Calvé +3 位作者 Fabian Cretton Nicole Glassey Balet Maria Sokhn Nicolas Délétroz 《Journal of Computer and Communications》 2015年第5期118-126,共9页
Switzerland is one of the most desirable European destinations for Chinese tourists;therefore, a better understanding of Chinese tourists is essential for successful business practices. In China, the largest and leadi... Switzerland is one of the most desirable European destinations for Chinese tourists;therefore, a better understanding of Chinese tourists is essential for successful business practices. In China, the largest and leading social media platform—Sina Weibo, a hybrid of Twitter and Facebook—has more than 600 million users. Weibo’s great market penetration suggests that tourism operators and markets need to understand how to build effective and sustainable communications on Chinese social media platforms. In order to offer a better decision support platform to tourism destination managers as well as Chinese tourists, we proposed a framework using linked data on Sina Weibo. Linked Data is a term referring to using the Internet to connect related data. We will show how it can be used and how ontology can be designed to include the users’ context (e.g., GPS locations). Our framework will provide a good theoretical foundation for further understand Chinese tourists’ expectation, experiences, behaviors and new trends in Switzerland. 展开更多
关键词 Linked Data SEMANTIC Web DECISION Support System Natural Language Processing BEHAVIORS Analysis Social Networks Chinese TOURIST Switzerland New Trends SINA Weibo
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Development of Bedulu Village Towards Future Tourism
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作者 Ni Komang Nariani I Komang Gde Bendesa Made Budiarsa 《Management Studies》 2019年第3期247-256,共10页
Tourism is one of the largest industries in the world and a promising sector to boost a country’s growth. Bedulu Village in Gianyar Regency, Bali, is a village with high tourism potential. The village has beautiful n... Tourism is one of the largest industries in the world and a promising sector to boost a country’s growth. Bedulu Village in Gianyar Regency, Bali, is a village with high tourism potential. The village has beautiful natural scenery and archaeological heritage sites, which enable tourists to enjoy culture, nature, pilgrimage, and educational tourism. Although some efforts have been made by the locals to improve the quality of tourism, the management of tourism in Bedulu Village is still handled sketchily using a simple system, in addition to a lack of proper human resources and infrastructure. Therefore, Bedulu Village still requires further development for potential tourism attraction in order to become quality tourist destination in the future. The purpose of this study was to analyze the current situation of tourism in Bedulu and determine the necessary development needed for future tourism in Bedulu Village. The data collected from the object of research were analyzed using descriptive-qualitative analytical method. The results from this study are: While Bedulu Village has been adequately prepared in terms of tourist attractions and tourist accommodation, it is still in need of further development in areas, such as infrastructure, marketing, and the empowerment of local community. This will allow the village to stay competitive in the face of mass tourism of nearby places, like Ubud and lead to community’s welfare, which in turn will secure future tourism of Bedulu Village. 展开更多
关键词 DEVELOPMENT COMMUNITY-BASED TOURISM FUTURE EMPOWERMENT
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Reform and Construction of Tourism Management Major in Higher Vocational Colleges under the Background of Global Tourism
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作者 Peiming Du Falin Fang 《Journal of Educational Theory and Management》 2018年第1期12-16,共5页
Based on a lot of research on the tourism employers, the employment demands in the current tourism industry have been clear. By communicating and exchanging with the relevant units such as the scenic areas and travel ... Based on a lot of research on the tourism employers, the employment demands in the current tourism industry have been clear. By communicating and exchanging with the relevant units such as the scenic areas and travel agencies, the tourism posts in the actual work have been combined with the classroom teaching tasks to carry out the school-enterprise cooperation mode, highlight the combination of learning with working with the market as orientation as well as conduct the teaching reform and explore the new mode for the teaching reform of tourism management major combined with the suggestions raised by the tourism units and the current situation of tourism management major so as to contribute to improving the students' employability. 展开更多
关键词 Whole-region TOURISM TOURISM management REFORM and CONSTRUCTION
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The Cultivation of Cross-cultural Communication Ability for Students of the High Vocational Tourism College in Sino- foreign Education Cooperation
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作者 Danlu LIAO 《International Journal of Technology Management》 2015年第10期53-55,共3页
In recent years, with rapid development of Sino-foreign cooperation in higher vocational colleges, it puts forward higher requirements for students' English comprehensive ability. According to the characteristics of ... In recent years, with rapid development of Sino-foreign cooperation in higher vocational colleges, it puts forward higher requirements for students' English comprehensive ability. According to the characteristics of higher vocational colleges of tourism, as well as the author' s own teaching experience, this paper elaborates the characteristics of English teaching in the Sino-foreign cooperative education, and the ways to cultivate and improve cross-cultural communication ability for students in tourism colleges. 展开更多
关键词 Sino-foreign Education Cooperation Tourism College Cross-cultural Ability
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Translation of Metro Station Names in Guangzhou and Foshan from the Perspective of Symbolic Function of Translation Landscape
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作者 LUO Yu LI Xiao-yun 《Journal of Literature and Art Studies》 2023年第4期304-310,共7页
Guangzhou and Foshan enjoy relatively mature metro network.However,some names of metro stations are over-transliterated in Pinyin.Such a translation method is used in translating general names,nouns of locality and so... Guangzhou and Foshan enjoy relatively mature metro network.However,some names of metro stations are over-transliterated in Pinyin.Such a translation method is used in translating general names,nouns of locality and some names of tourist destinations.With translation landscape and linguistic landscape theories,the reasons and impacts of over-transliteration in Guangzhou and Foshan metro will be discussed from the perspective of symbolic function.English names of Metro stations in other cities serve as a reference so as to appropriate solutions. 展开更多
关键词 names of Metro stations translation landscape linguistic landscape Pinyin transliteration
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Standards of Ecological Compensation for Traditional Ecoagriculture:Taking Rice-Fish System in Hani Terrace as an Example 被引量:33
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作者 LIU Mou-cheng XIONG Yin +3 位作者 YUAN Zheng MIN Qing-wen SUN Ye-hong Anthony M.Fuller 《Journal of Mountain Science》 SCIE CSCD 2014年第4期1049-1059,共11页
Traditional eco-agriculture provides many ecosystem services which are important for the local environment, especially in mountain areas. In order to encourage the farmers to engage in coo-agriculture, it is necessary... Traditional eco-agriculture provides many ecosystem services which are important for the local environment, especially in mountain areas. In order to encourage the farmers to engage in coo-agriculture, it is necessary to establish an eco-compensation mechanism for them. As the compensation standard is one of key issues in establishing eeo-compensation mechanism, this paper calculated the standard based on the farmers' willingness to accept (WTA) and the input-output analysis of eco-compensation. We took the traditional rice-fish eco-agriculture as the research object, conducting field surveys in Hani Terrace of Honghe County. Through the questionnaires in 2o11, we obtained the farmers' willingness to accept government compensation and market compensation. Then, the research evaluated the output of eco-compensation, the economic value of rice-fish paddy ecosystem services. Finally, under different market compensation standards, we compared the input and output of government compensation. The results show that, in 2011 the government should to pay farmers 7462 yuan.ha^-1·a^-1 to meet their willingness, but the output (ecological benefit) was only 7393 yuan.ha^-1·a^-1. However, whenthe rice price increases 1 yuan·kg-1 because of the limited use of chemicals in the next year, the government just has to pay farmers 4062 yuan.ha^-1·a^-1 and the surplus will be 3331 yuan.ha^-1·a^-1. 展开更多
关键词 Eco-compensation Eco-agriculture Ecosystem services Cultivation system Hani Terrace.
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Current Situation and Influencing Factors of Pluriactivity in Mountainous and Hilly Rural Areas of Sichuan Province,China 被引量:4
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作者 LIU Shao-quan ZHANG Hai-qin +1 位作者 XIE Fang-ting GUO Shi-li 《Journal of Mountain Science》 SCIE CSCD 2013年第3期445-454,共10页
In this study, the current situation of pluriactivity in mountainous and hilly rural areas of Sichuan province was analyzed using representative sample survey data and natural factor data calculated based on 30 m-reso... In this study, the current situation of pluriactivity in mountainous and hilly rural areas of Sichuan province was analyzed using representative sample survey data and natural factor data calculated based on 30 m-resolution DEM and GIS. Moreover, using logistic regression model, a quantitative analysis was conducted on factors influencing pluriactivity in terms of individuals, households, communities and natural environmental conditions. The results showed that, (1) only 17.77% of rural laborers in mountainous and hilly areas of Sichuan province were engaged in pluriactivity. Geographically, pluriactivity was mainly chosen according to the "proximity principle", and was concentrated in construction and service industries; (2) the following factors have a significant influence on whether rural laborers in hilly areas engage in pluriactivity: gender, number of years of education, marriage, number of laborers and time to towns. Those with little influence include: age, health, family size, arable land per capita and per capita income, whether there are elderly people over 75 years and children less than 3 years. According to the main factors affecting pluriaetivity, the government should enhance vocational skills training for rural laborers in mountainous and hilly areas, especially for female laborers, further improve transport accessibility and encourage rural laborers, especially female laborers to move into pluriactivity to increase the income of farm households. 展开更多
关键词 Mountainous and hilly areas Rurallaborers Pluriaetivity Influencing factors
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Cosmogenic ^(10)Be and ^(26)Al Chronology of the Last Glaciation of the Palaeo-Daocheng Ice Cap,Southeastern Qinghai-Tibetan Plateau 被引量:6
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作者 ZHANG Zhigang WANG Jian +2 位作者 XU Xiaobin BAI Shibiao CHANG ZhiYang 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2015年第2期575-584,共10页
The glacial landforms of the Qinghai-Tibetan Plateau (QTP) provide a unique opportunity to research hemispheric and global environmental changes. In this study, we focus on the glacial history of the palaeo-Daocheng... The glacial landforms of the Qinghai-Tibetan Plateau (QTP) provide a unique opportunity to research hemispheric and global environmental changes. In this study, we focus on the glacial history of the palaeo-Daocheng Ice Cap (p-DIC) in the southeastern QTP during the last glacial cycle. Based on field investigations, morphostratigraphy, and surface exposure dating of roche moutonnée, polished surface and moraine debris through the terrestrial cosmogenic nuclides (TCN) ^10Be and ^26Al. We identify glacial deposits of the last deglaciation, with minimum ages of 14.9±1.3-18.7±1.7 ka, the Last Glacial Maximum (LGM) of 24.7±2.2 ka, and the early part of the last glacial period (marine oxygen isotope stage (MIS) 3) of 37.1±3.4-45.2±3.9 ka. Our results show that in this region, the extent of the glacial advance during MIS 3 was larger than that during the traditional LGM (MIS 2). These ages are consistent with prior chronologies, and the ^10Be age is consistent with the ^26Al age for the same sample. Thus, these data provide reliable constraints on climate change in the QTP, during the last glaciation. 展开更多
关键词 Terrestrial cosmogenic nuclides last glaciation MIS 3 palaeo-Daocheng Ice Cap Qinghai-Tibetan Plateau
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Carrying Capacity of Water Leisure Environment in Eco-cities-A Case Study of Ancient Canal Scenic Area in Yangzhou City 被引量:4
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作者 SONG Li XIAO Ping 《Journal of Landscape Research》 2013年第4期31-34,共4页
Water leisure tourism is an emerging theme in urban planning, and its planning mode and operation level directly influence the eco-cycle degree of urban development. Tourism activities inevitably impact environmental ... Water leisure tourism is an emerging theme in urban planning, and its planning mode and operation level directly influence the eco-cycle degree of urban development. Tourism activities inevitably impact environmental quality of urban water spaces, and the research on the environmental carrying capacity of such spaces has also become an important prerequisite of tourism planning. Taking the Yangzhou Ancient Canal Scenic Area for an example, the paper constructed the estimated indicators of water leisure tourism environmental carrying capacity on the basis of analyzing scenic geographical resources and tourism economic conditions, and calculated the scenic area's water leisure tourism environmental integrated carrying capacity by the method of barrel extrapolation, providing a reasonable foundation for evaluating the planning conditions in the eco-cycle urban water leisure tourism planning. 展开更多
关键词 Eco-cycle type WATER LEISURE tourism Environmental carrying capacity The ANCIENT CANAL SCENIC Area
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Valuation of Ecosystem Services:Research Progress and Prospects 被引量:3
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作者 FENG Ling 《Asian Agricultural Research》 2012年第10期75-79,共5页
The ecosystem services are material base and natural capital for sustainable development of human being. Valuation of ecosystem services is favorable for people realizing the importance of natural ecosystem to human b... The ecosystem services are material base and natural capital for sustainable development of human being. Valuation of ecosystem services is favorable for people realizing the importance of natural ecosystem to human being, and considering its long-term influence on sustainable development of human society when making decisions. Besides, it is an attempt of ecology, geography and other natural sciences to influence social decision process by economic methods. The Value of the World's Ecosystem Services and Natural Capital, written by Robert Costanza et al., in 1997, is generally regarded as a masterpiece for the research of valuing ecosystem services. However, the classifying standard of ecosystem services, the method of various services summation and the purpose for static global value, had confronted many criticisms. Still to now, accurately valuing ecosystem services is not easy, because of the complexity of natural ecosystem, the weak capability of economic system to pricing ecosystem services and the lack of more study in this field. Based on the criticisms summarizing and comprehensive analysis, further study suggestions of ecosystem services valuation is presented: multi-scale integrated and community participation applied in evaluation, dynamic changes of material value and intangible value of ecosystem services, investigation and simulation studies of the marginal value when ecosystem services changed, associated with related areas like ecological compensation research, and research on the market-oriented evaluation of ecosystem's intangible values. 展开更多
关键词 ECOSYSTEM SERVICES VALUE EVALUATION Research progr
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Community Regeneration Based on CPTED Theory: A Case Study of Rosengard Residential Area in Sweden 被引量:1
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作者 GU Zhixin 《Journal of Landscape Research》 2016年第5期7-10,14,共5页
With urban development and social transformation, residential areas in some western countries have been faced with safety problems and community deterioration. In order to solve these problems through community planni... With urban development and social transformation, residential areas in some western countries have been faced with safety problems and community deterioration. In order to solve these problems through community planning, Crime Prevention through Environmental Design(CPTED) theory had been applied to practice. Rosengard residential area in Malmo, Sweden was a typical example of underclass community with physical and social problems. However, regeneration programme based on CPTED theory aimed to change the community from a problematical area to a safe and attractive neighborhood. Multidimensional analysis was carried out to illustrate the relationship between environmental improvement and security from community image, traffic system, territoriality and natural surveillance perspectives. This study could be considered as a referential approach for community construction and regeneration in China. 展开更多
关键词 Community regeneration CPTED theory Natural surveillance Residential area
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A Multi-Resolution Photogrammetric Framework for Digital Geometric Recording of Large Archeological Sites: Ajloun Castle-Jordan 被引量:1
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作者 A’kif Al-Fugara Rida Al-Adamat +2 位作者 Yahya Al-Shawabkeh Omar Al-Kour Abdel Rahman Al-Shabeeb 《International Journal of Geosciences》 2016年第3期425-439,共15页
The generation of reality-based 3D models of archeological sites is the future of representing existing ancient structures. Such approach requires substantial economic and logistical costs which limit this application... The generation of reality-based 3D models of archeological sites is the future of representing existing ancient structures. Such approach requires substantial economic and logistical costs which limit this application. In this context, this paper presents the use of photogrammetric workflow, based on Structure from Motion techniques (SfM) to derive 3D metric information from Structure-and-Motion images. The interdisciplinary 3D modeling framework consists of fusion of multi resolution images from both overlapped low-altitude aerial and multi-view terrestrial imagery. The acquisition of aerial photographs survey was based on archived oblique aerial stereo pair photos acquired from the Aerial Photographic Archive for Archaeology in the Middle East (APAAME) project, while terrestrial of close range photos covering the castle walls has been acquired using portable camera. Camera calibration and orientation were carried out by VisualSFM, CMPMVS (Multi-View Reconstruction) and SURE (Photogrammetric Surface Reconstruction from Imagery) software. The resulted cloud points were processed using cloud Compare, MeshLab, Agisoft, and Skethup Softwares. A complete 3D digital geometric recording of the site was accomplished based on dense 3D point clouds with realistic metric accuracy and photorealistic performance to meet all the surveying and archaeological needs. The final Ajloun castle’s digital model geometry was added as a 3D building layer on Google Earth. 展开更多
关键词 Ajloun Castle 3D Modeling SFM Terrestrial Images Aerial Photos Archaeological Documentation PHOTOGRAMMETRY
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Periodic Solutions for a Kind of Second-Order Neutral Differential Equation on Time Scales
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作者 张莉 杜波 葛渭高 《Journal of Beijing Institute of Technology》 EI CAS 2010年第3期375-378,共4页
In this paper,the existence of periodic solutions and nonnegative periodic solutions for a kind of second-order neutral differential equation on time scales is considered.The partial increment is a fixed constant if t... In this paper,the existence of periodic solutions and nonnegative periodic solutions for a kind of second-order neutral differential equation on time scales is considered.The partial increment is a fixed constant if the time scale is the real number set and is a multiple of the periodic of the time scale if the time scale is not the real number set.By means of a fixed point theorem due to Krasnoselskii,some sufficient conditions are obtained. 展开更多
关键词 time scale periodic solutions NEUTRAL fixed point theorem
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Effect of soil-rock system on speleothems weathering in Bailong Cave,Yunnan Province,China
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作者 王静 宋林华 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE EI CAS CSCD 2005年第3期202-207,共6页
Bailong Cave with its well-developed Middle Triassic calcareous dolomite’s system was opened as a show cave for visitors in 1988. The speleothem scenery has been strongly weathered as white powder on the outer layers... Bailong Cave with its well-developed Middle Triassic calcareous dolomite’s system was opened as a show cave for visitors in 1988. The speleothem scenery has been strongly weathered as white powder on the outer layers. Study of the cave winds, permeability of soil-rock system and the chemical compositions of the dripping water indicated: (1) The cave dimension structure distinctively affects the cave winds, which were stronger at narrow places. (2) Based on the different soil grain size distribution, clay was the highest in composition in the soil. The response sense of dripping water to the rainwater percolation was slow. The density of joints and other openings in dolomite make the dolomite as mesh seepage body forming piles of thin and high columns and stalactites. (3) Study of 9 dripping water samples by HYDROWIN computer program showed that the major mineral in the water was dolomite. 展开更多
关键词 Soil-rock system WEATHERING Cave wind PERMEABILITY Dripping water
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