1,720,962 research outputs found
Basic research of applying the guided wave to the foundation piles of offshore wind turbines
No full text因離岸風力發電機(簡稱風機)身處大海，其海床表面下的樁柱基礎在受自身振動、海洋動力(波浪及海流)、或地震等外力作用後，樁柱與海床砂石之固著程度可能改變，而其固著的緊密情況將影響到風機的穩定度。因此水中樁柱有必要做定期的檢測，而導波法具有長距離傳遞且能量不易衰減的特性，入射於管線上傳遞，可擴大管線檢測範圍，故本研究以超音波換能器所致之導波法來對樁柱結構上的特性評估、規劃、設計並開發一套有效的非破壞性檢測方法及設備，對樁柱基礎做定期的評估。 因此在本研究中，將風力發電機的基樁先簡化以單一鋼管為模型代表，先建立一套導波檢測之方法，以PCdisp繪出頻散曲線圖後，找出合適之入射模態及角度，架設超音波換能器以調整入射角度至最佳狀況後，因需探討基樁位於海床中之固著程度改變與表面腐蝕的情形，故以包覆實驗模擬基樁周圍土層之包覆情形，及以人工腐蝕的方式模擬基樁表面受到腐蝕，再以所建立的導波方法進行檢測，並討論及歸納出其底部回波訊號改變之規則，以提供現場檢測人員分析訊號結果之依據，並可達到基樁結構維護監測之目的。As offshore wind turbines are located in the sea, column foundation piles under the surface of the seabed which are affected by vibration, ocean power (waves and currents), earthquakes and other external forces, might affect the firmness between the foundation piles and the seabed. This will in turn affect the stability of the offshore wind turbine. Therefore, regular maintenance of the piles is very important. Since the guided wave method has long-range energy transmission and does not lose energy easily, when we use pipeline to transmit, the pipeline detection range would be greater. In this study, we will be using the ultrasonic transducer to make the guided wave method so as to assess the characteristics of the column on the surface. After which, we will start to plan, design and develop testing equipment and methods which are safe and effective in order to conduct regular assessments of the piles’ foundation. In this study, the foundation piles will be replaced by a single steel pipe as a model represent. PCdisp will be used to draw the dispersion curve to find the suitable mode and angle. After setting up the ultrasonic transducer and adjusting it to the best settings, we will explore the firmness between the foundation piles, the seabed and the corrosion of the surface. We will then be able to design a coated experiment to simulate the coated situation, and also an artificial corrosion experiment to simulate the corrosion. By applying the guided wave method, we will analyze and judge the structural condition of the surface so as to achieve the purpose of this study
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
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
Upper Rim Allyl- and Arylazo-Coupled Calix[4]arenes as Highly Sensitive Chromogenic Sensors for Hg2+ Ion
No full textAuthor-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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