1,720,961 research outputs found
ANALISIS PENGARUH PENGGUNAAN BAHAN BAKAR ALKOHOL TERHADAP PELEPASAN PANAS DAN KINERJA MESIN PEMBAKARAN
Full text linkGasoline engines are crucial, especially in the transportation sector, and currently rely on fossil-based gasoline, which is expected to deplete. To meet domestic energy needs, the country must import gasoline. Therefore, there is a need for renewable energy sources that do not require major modifications to the engine. Methanol, a renewable alcohol fuel derived from plant materials, was tested in a 20% blend with gasoline in a TV-1 engine with a power output of 4.50 kW, a single cylinder, four-stroke configuration, and a cylinder volume of 661.45 cc. The research results indicate that the engine performance with the methanol blend is better in terms of cylinder pressure and heat release. The largest difference in cylinder pressure is 1.91 bar, while the largest difference in heat release is 1.64 J/°C. However, the specific fuel consumption for the methanol blend is higher compared to pure gasoline, with an average specific fuel consumption for the methanol-blended gasoline being 8.7% higher than that of pure gasoline.
Mesin bensin sangat penting, terutama dalam sektor transportasi, dan saat ini bergantung pada bensin berbasis energi fosil yang diperkirakan akan habis. Untuk memenuhi kebutuhan energi domestik, negara harus mengimpor bensin. Oleh karena itu, diperlukan sumber energi terbarukan yang tidak memerlukan perubahan besar pada mesin. Metanol, bahan bakar alkohol yang dapat diperbaharui dari bahan nabati, diuji dalam campuran 20% dengan bensin pada mesin bensin TV-1 dengan daya 4,50 kW, satu silinder, empat langkah, dan volume silinder 661,45 cc. Hasil penelitian menunjukkan bahwa performa mesin dengan campuran metanol lebih baik dalam hal tekanan silinder dan pelepasan panas. Selisih terbesar pada parameter tekanan silinder adalah 1,91 bar, sedangkan pada parameter pelepasan panas, selisih terbesar mencapai 1,64 J/°C. Namun, konsumsi bahan bakar spesifik untuk campuran metanol lebih tinggi dibandingkan dengan bensin murni, dengan rata-rata konsumsi bahan bakar spesifik bensin yang dicampur metanol 8,7% lebih tinggi dibandingkan bensin murni.
 
Analisis Getaran dan Kebisingan Terhadap Rasio Kompresi Pada Mesin Bensin TV1
Full text linkMotor bakar terkhusus mesin bensin telah menjadi penopang utama kebutuhan transportasi dan industri. Mesin bensin yang tersedia memiliki rasio kompresi bervariasi. Tujuan penelitian ini adalah untuk mengetahui getaran dan kebisingan yang dihasilkan dari mesin bensin pada operasi dengan berbagai rasio kompresi. . Penelitian ini menggunakan mesin bensin dengan 1 silinder dan 4 langkah, alat ukur suara (sound level meter) untuk mengukur kebisingan, pengukuran getaran dilakukan menggunakan alat VibexpertII menggunakan mode percepatan. Hasil yang diperoleh dari penelitian ini adalah besar nilai getaran dan kebisingan dipengaruhi oleh besar rasio kompresi yang digunakan. Â Â Â
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
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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