1,720,958 research outputs found
The impacts of urban landscape pattern on urban land surface temperature - taking Urumqi as an example
No full textUrbanization has become an important contributor for global warming and urban air temperature is rising gradually in all the cities. It means that urban land use and land cover (LULC) changed became critical in determining the urban environment quality. This paper presents an integrated study to investigate and identify landscape pattern which have the influence to increase of land surface temperature, using Geographical Information Systems (GIS) and remote sensing. In this paper, an oasis city-Urumqi as an example, which explores the temporal and spatial characteristics of land use and land cover change from 1990 to 2004, and the land surface temperature variation from 1990 to 2004. Results shows that land use of Urumqi appeared a dramatic variation during the last 15 years. The mean annul temperatures of the land surface in Urumqi were 21.41 °C in 1990 and 31.12 °C in 2004, respectively. In particular, the land surface temperature and landscape pattern index had shown the close relationship. To sum up, integration of remote sensing and GIS was an effective way to monitor and analyze urban LULC, and evaluate the landscape pattern impact on land surface temperature. ©2009 IEEE. (16 refs.
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
A new geospatial data model to facilitate geographic data mining and knowledge discovery
No full textThe explosive growth in both the volume and density of geospatial data, which has resulted in the difficulty of geospatial data mining and knowledge discovery, emphasizes the need for advancing the query, analysis and computation capacity of geospatial database. In addition, distributing applications based on internet requires geospatial database and data model to accomplish the perpetually increasing demands of the query, computation and analysis distributing. Aimed at the above-mentioned issues, a new geospatial data model, X3DORGDM(X3D-based Oriented Relation Geospatial Data Model) is designed according to the integration among the improvement of database theory, the development of computational geometry algorithms and the deployment of next generation data format of Web visualization, X3D(eXensible 3D). Through a quantitative analysis on X3DORGDM, the result shows the determinants of its spatial computing and the performance of its topological computation. X3DORGDM, as the core of spatial database, will facilitate spatial data mining and knowledge discovery, due to the robustness of its architecture, the flexibility of Structured Query Language(SQL) and the extensibility of its computational algorithm library. © 2008 IEEE. (40 refs.
Satellite sensor data analysis of urban surface temperatures and land use / land cover
No full textWith the rapid population growth, urbanization has become a common trend all over the world since the 20th Century. Meanwhile, urban air temperature is rising gradually in all the cities. In this paper, we took an oasis city-Urumqi as an example, investigated application of integration of remote sensing and geographic information systems (GIS) to detect the land use/cover change and urban growth, besides assessed their impacts on land surface temperature in this region. The results indicated as fellows: 1) during the last 20 years from 1990 to 2009, land use of Urumqi appeared a dramatic variation; 2) The mean annul temperatures of the land surface in Urumqi were 21.63°C and 25.39°C in 1990 and 2009, respectively. 3) According to the characteristics of the standard classification maps of land surface temperature and they revealed that the urban development had raised the land surface temperature of the urban. 4) Integration of remote sensing and GIS was an effective way to monitor and analyze urban growth pattern, and evaluate the urbanization impact on land surface temperature. © 2010 IEEE. (10 refs.
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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