1,720,965 research outputs found
POTENSI TEMPURUNG KELAPA SEBAGAI SUMBER ENERGI TERBARUKAN DI KABUPATEN BOMBANA PROVINSI SULAWESI TENGGARA
No full textTempurung kelapa merupakan salah satu jenis biomassa yang merupakan limbah pertanian yang memiliki potensi untuk dikembangkan sebagai sumber energi terbarukan di Indonesia. Kabupaten Bombana merupakan daerah penghasil kelapa terbesar di Provinsi Sulawesi Tenggara. Umumnya petan ikelapa di Kabupaten Bombana menjual hasil perkebunan mereka dalam bentuk produk olahan berupa kopra dimana proses pengolahannya menyisakan limbah berupa sabut dan tempurung dalam jumlah yang sangat besar. Kajian ini bertujuan untuk menghitung potensi tempurung kelapa sebagai sumber energy terbarukan di Kabupaten Bombana. Pada Penelitian ini digunakan data produksi kelapa dari tahun 2014 – 2019. Berdasarkan data produksi dilakukan perhitungan perkiraan produksi tempurung kelapa serta perhitungan potensi energi yang dihasilkan. Hasil perhitungan menunjukkan bahwa potensi energy maksimum diperoleh tahun 2014 mencapai 31.000 GJ dan minimum pada tahun 2016 sebesar16.000 GJ
EFEKTIVITAS PENUKAR KALOR TIPE WL 110 MODEL CONSENTRIS TUBE MENGGUNAKAN METODE ELEMEN HINGGA
Get PDFPenukar Kalor merupakan alat yang menyebabkan terjadinya perpindahan energi antara 2 fluida yang temperaturnya berbeda. Kajian ini bertujuan untuk menghitung efektivitas perpindahan panas penukar kalor tipe WL 110 Model Consentric Tube menggunakan Metode Elemen Hingga. Sebagai variabel bebas adalah debit air dingin (5 variasi) dan akan dianalisa pengaruhnya terhadap efektivitas perpindahan panas. Pengambilan data dilakukan dengan menggunakan penukar kalor tipe WL 110 Model Consentric Tube. Hasil yang diperoleh menunjukkan bahwa peningkatan debit aliran air dingin akan menurunkan efektivitas perpindahan panas. Kata Kunci: Laju aliran air dingin, efektivitas penukar kalor, metode elemen hingga
ANALISIS KARAKTERISTIK ALIRAN MELALUI PENAMPANG PERSEGI PANJANG MENGGUNAKAN MODEL TURBULEN LARGE EDDY SIMULATION (LES)
Get PDFDynamic response, fatigue, and stability issues of a structure are closely related to flow behavior past a bluff body structure. Flow past the free-end rectangular prism is investigated numerically using a Large Eddy Simulation (LES) turbulence model at Re = 22000. The prism model has a constant depth (D) to width (H) ratio D/H = 0.5 for span length variation L (= 10; 7,5; 5,0 and 2,5H). Effects of the free end on the flow characteristics showed that the flow pattern, velocity vector, and fluid forces component are changed. The presence of the free end is closed related to the flow characteristics alteration in the wake, which is presented graphically in this paper. This study suggests the critical aspect ratio of the slender rectangular is 2,5<L/H<5,0 The prism with critical aspect L = 2,5H presented an unusual flow behavior among the test models. The dynamic response of the test model affects the flow pattern in the wake, which is indicated by alteration of the region and intensity of vorticity, velocity vector, hydrodynamic force components, and other local components
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
PREDIKSI INTENSITAS ENERGI ANGIN TAHUNAN DI SULAWESI TENGGARA DENGAN MENGGUNAKAN PEMODELAN DISTRIBUSI WEIBULL
Get PDFSulawesi Tenggara adalah salah satu daerah di Indonesia yang saat ini masih memiliki rasio kelistrikan yang lebih rendah dibandingkan dengan rasio kelistrikan rata-rata di Indonesia. Hal ini dapat menjadi salah satu faktor penghambat dalam pembangunan. Energi angin merupakan salah satu energi alternatif, terbarukan dan bersih yang dapat diterapkan sebagai sumber energi listrik di Sulawesi Tenggara. Salah satu aktifitas dalam mengkaji kelayakan aplikasi teknologi energi angin dalam suatu wilayah adalah perkiraan intensitas energi angin tahunan. Hal ini memungkinkan untuk mengkaji apakah teknologi ini akan memberikan nilai keekonomian bagi penggunanya. Salah satu cara dalam memprediksi energi angin adalah dengan menggunakan model distribusi Weibull. Studi ini bertujuan untuk memprediksi intensitas energi tahunan angin di Sulawesi Tenggara, dengan metode pemodelan distribusi Weibull, yang dikombinasikan dengan data kecepatan angin dari Dinas Energi dan Sumber Daya Mineral Provinsi Sulawesi Tenggara. Dalam menghitung menggunakan model, studi ini menggunakan skenario variasi koefisien Weibull, yang berupa faktor bentuk dan faktor skala. Hasil dari studi ini menunjukan bahwa intensitas energi angin tahunan di Sulawesi Tenggara adalah sekitar 307 KWH/m2 sampai 625 KWH/m2.
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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