1,720,988 research outputs found
Vibration and Impact Studies of Multigirder Steel Bridges in Laboratory
No full textThe impact of highway bridges resulting from the passage of vehicles across spans is an important problem encountered in the design of bridges. Many parameters that may affect the impact factor include the velocity and dynamic properties of the moving vehicle, the dynamic properties and boundary conditions of the bridge, and the roughness in road pavement. According to the truck design loading specified by AASHTO and the structural similarity principle, a vehicle and a multi-girder steel bridge are designed and constructed in laboratory for impact studies and further identification of the moving axle loads. The 3-D finite element method in the professional software package, ABAQUS, is used to calculate the dynamic characteristics of the bridge. The experimental modal analysis technique is adopted to measure the modal properties of both vehicle and bridge. The influence of both the vehicle velocity and lateral lane position on the impact factor is investigated. Accurately estimation of the static responses of bridges due to moving vehicles is considered and compared with the filtered static responses. Results arc uscli11 for the bridge design and the further study on the development of impact formulae proposed by the bridge loading code
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
Assessment of Fatigue Damage in the Tsing Ma Bridge under Traffic Loadings by Finite Element Method
No full textSteel bridges are vulnerable to fatigue damage caused by traffic loadings. The Tsing Ma Bridge (TMB) in Hong Kong, of 2.2 km total length and a main span of 1377 m, is the steel suspension bridge in the world carrying both road and rail traffic. This paper is to study the fatigue damage of the TMB using the Finite Element Method. An effective finite clement (FE) model of TMB embodying the properties of almost all the structural members was developed. The verification of the model was carried out with the help of online data. The dynamic response of the TMB under traffic loading was analyzed using the developed FE model. Considering the bridge fatigue damage is local damage, a local damage model is applied in the FE model of the TMB with possible fatigue damage degree and its evolution equation. As the TMB is at its virgin state and the traffic volume on the bridge is relatively light, an update ratio of the traffic volume is also considered in the proposed FE model. With the established FE model, the future response of the Bridge could be simulated and, the damage degree in the Bridge under traffic loading could be assessed too. All of these results provide a basis of estimating the remaining service life of the TMB
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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
- …
