1,720,959 research outputs found
流動性材料を用いた有限領域のダム破壊流れの基本特性とその応用に関する研究
Get PDF京都大学0048新制・課程博士博士(工学)甲第15344号工博第3223号新制||工||1485(附属図書館)27822京都大学大学院工学研究科都市社会工学専攻(主査)教授 細田 尚, 教授 後藤 仁志, 准教授 米山 望学位規則第4条第1項該当Doctor of Philosophy (Engineering)Kyoto UniversityDFA
Insights into the flow characteristics of tsunami bores and surges: a case study of Malaysian coastline
No full textTsunamis, despite their rarity, are among the deadliest natural disasters, inflicting catastrophic damage on bothcoastal and inland regions. Given their highly site-specific impact, a comprehensive understanding of tsunamiwave flow characteristics is crucial for effective tsunami preparedness and for safeguarding civil engineeringstructures. This study investigates the formation and progression of tsunami bores as they transition into surgesnear the shore. We employed a wave-flume experimental approach, with a specific focus on the Malaysiancoastline. Experiments took place in a wave flume with a length of 40 m and a platform designed to replicatethe gentle slopes commonly found in Malaysian coastal areas vulnerable to tsunamis. The primary focus lied inmeasuring key flow parameters, including flow depths and velocities near the shore. Wet bed bores were markedby a sudden rise in water depth and considerable air entrainment in the front region. As these waves transformedinto dry bed surges, the front slope became gentler, and aeration diminished, while peak velocities increased.Additionally, the study also delves into the relations between flow depth and velocity concerning Froude numbersand momentum flux. The outcomes contribute significantly to global initiatives aimed at improving coastalresilience against tsunamis. 
A Fundamental Study of Supercritical Flow at Sudden Expansion Structure by Using Numerical Model
No full textIn the design of hydraulic structures, it is common to deal with the supercritical flow. Abrupt expansion structure represents a type of transition often constructed in manmade hydraulic structure (e.g. chutes in dam structures, sewer or drainage system, an irrigation channel, etc.) to cater the geometry difference. It is important to cater to the design of such transition especially it involves flow with high velocity. The flow features of high-velocity flow at sudden expansion channel are studied. A two-dimensional depth-averaged model (DA model) incorporate with Constrained Interpolation Profile (CIP) scheme is developed to simulate the supercritical flow at the abrupt expansion channel. The numerical model is able to reproduce the flow features of supercritical flow at the abrupt expansion structure. The simulated results are compared with the analytical solution with a different degree of agreement is observed. The same numerical setup is applied to the model generated by FLOW-3D model. The numerical results from the DA model and FLOW-3D model are compared with previous experimental results. The simulated results from the DA model showed better agreement with the experimental results
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
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