1,720,963 research outputs found
Potensi Energi Angin (Studi Kasus Pemanfaatan Energi Angin untuk WilayahKodya Makassar dan Sekitarnya)
Full text linkThe mean hourly wind speed in the year of 1997 at the city of Makassar has been analyzed by Weibull distribution. The analysis shows the wind is generally light and irregular and the distribution has a relatively high dispersion, since the values of Weibull parameters: the shape factor k and scale factor c are 1.52 and 4.91 respectively. The average wind speed 4.42 knot (2.27 m/s). The necessary calculations of the output of windmill for water pumping on the basis of wind regime data are explained. From the cost consideration, the price of water supply by windmill is higher than by the electric pump set. It is clear that the use of windmill for water pumping is not attractive as alternative energy utilization.
Keywords: Wind energy, Weibull function, shape and scale factor
Turbin Air : Teori Dan Dasar Perencanaan.-- ed. 1
No full textSecara ringkas buku ini membahas:
a) Pemahaman tentang dasar-dasar turbin air seperti tinggi terjun, daya turbin, klasifikasi dan jenis turbin air, putaran spesifik , pemilihan turbin sesuai tinggi terjun, daya dan putaran turbin.
b) Pemahaman tentang kecepatan- kecepatan absolute, relative, dan keliling guna perancangan ukuran-ukuran utama sudu gerak dan sudu pengarah pada turbin.
c) Perhitungan kerugian-kerugian daya dalam turbin dan efesiensi turbin.
d) Kavitasi, pipa isap (draft tube), putaran kritis.
e) Turbin Bankin dan roda air.
Buku ini dilengkapi dengan contoh-contoh perhitungan tentang perancangan turbin dan pada akhir setiap bab diberikan pertanyaan- pertanyaan- guna menambah pemahaman tenatang masalah turbin air
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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