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Quenching and Re-Initiation Mechanism of Detonation Wave Passing through an Expansion Channel
Full text link学位記号番号: 博理工甲第669号博士の専攻分野の名称 : 博士(工学)
学位授与年月日 : 平成20年3月24日textapplication/pd
Analisis kegagalan detonasi akibat proses difraksi
No full textTheoretically, detonation wave propagated in combustible gas mixture can be suppressed by chemical and physical method. Although both methods are possible to be implemented in industrial fields, the
physical method is more interesting due to its simplicity and flexibility. In physical method, the detonation wave is transformed to be deflagration wave by mechanism of diffraction by an expansion wave. However, the diffraction mechanism itself is very difficult to be analyzed due to 3-dimensional effects of detonation flow field. In this experiment, the 3-dimensional effects are reduced by using single gap orifice diffracting detonation to 2 directions. Single gap orifice made from aluminum material was installed into detonation tube filled by stoichiometric condition of hydrogen-oxygen mixture with an initial pressure of 50 kPa. The detonation wave diffracted from the model in over driven mode is quickly decayed to condition which lower than Chapman-Jouguet condition. The decreasing of the detonation wave velocity along diffraction process is caused by an expansion wave around corner of the model and it reduces pressure and temperature behind the shock wave. The decreasing of pressure and temperature behind the shock wave will reduce rate of the chemical
reaction and detach it from the shock wave.
Keywords: deflagation, detonation, shock wave, diffractio
DESAIN, ANALISIS KEKUATAN DAN TERMAL CRANKCASE DAN SILINDER MESIN DIESEL DENGAN DAYA 6 HP
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Full text link“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
Full text linkWe 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
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