1,720,955 research outputs found
Pengaruh Kinerja Mesin Diesel Yanmar L-40-E-DT Terhadap Kandungan O2 dan CO2 pada Emisi Gas Buang
No full textProses pembakaran atau penguapan bahan bakar tersebut akan menghasilkan gas buang (emisi). Atmosfer yang bisa disebut udara yang terdiri dari gas utama, yaitu Oksigen (O2) sebanyak kurang lebih 21% volume dan Nitrogen (N2) sebanyak kira-kira 78% dari bagian atmosfer. Sisa 1% lainnya dari berbagai gas, yaitu Argon (Ar) sebanyak 0,94%, sisanya 0,06% terdiri dari CO2, CO, HC, NOx, SOx, dan lain-lain. Tujuan dari penelitian ini adalah mengetahui pengaruh kinerja mesin mesin diesel Yanmar L-40-E-DT terhadap kandungan O2 dan CO2 pada emisi gas buang. Pada pengujian ini dilakukan variasi pembebanan yaitu 750,1000 dan 1250 gram pada putaran mesin konstan 3000 rpm. Berdasarkan hasil penelitian dan pembahasan dapat diketahui bahwa daya mesin 0,349 – 0,518 (Kw), kadar oksigennya 18 – 16,5 %, kadar carbon dioksida mengalami kenaikan yaitu 2,5 – 3,7 %. Semakin besar pembebanan pemakaian bahan bakar semakin naik yaitu 0,149 – 0,199 kg/jam kadar oksigen menurun yaitu 18 – 16,5%, kadar carbon dioksida naik dari 2,5 hingga 3,7 %. Kata kunci: Kinerja mesin, Emisi gas buan
Pengaruh Kapasitas Udara Untuk Campuran Solar Terhadap Prestasi Mesin Diesel
No full textPenelitian ini mempelajari pengaruh kapasitas udara dalam ruang pembakaran (silinder ) sebagai campuran bahan bakar solar terhadap prestasi mesin Diesel. Untuk mengetahui kapasitas udara yang masuk kedalam ruang pembakaran digunakan alat ukur Orifice berdiameter 7,5 , 10 , 12,5 15 dan 20 mm. pada putaran mesin 3000 rpm konstan Udara luar masuk ruang pembakaran melalui lubang Orifice yang dipasang pada dinding kotak segi empat yang kedap dengan tekanan dan temperatur udara luar, kemudian udara ini diteruskan kedalam ruang bakar melalui katup isap.oleh isapan gerakan piston dengan kecepatan konstan. Dari hasil penelitian menunjukkan bahwa, effisiensi termal yang optimal diperoleh pada orifice berdiameter 10 mm dengan putaran 3000 rpm. Kata kunci: Kapasitas udara, Prestasi mesi
Analisis Kinerja Mesin Diesel Yanmar L-40-E-DT Terhadap Kandungan Karbon Monoksida (CO) pada Emisi Gas Buang
No full textPembakaran bahan bakar akan menghasilkan gas buang (emisi). Atmosfer yang bisa disebut udara yang terdiri dari gas utama, yaitu Oksigen (O2) sebanyak kurang lebih 21% volume dan Nitrogen (N2) sebanyak kira-kira 78% dari bagian atmosfer. Sisa 1% lainnya dari berbagai gas, yaitu Argon (Ar) sebanyak 0,94%, sisanya 0,06% terdiri dari CO2, CO, HC, NOx, SOx, dan lain-lain. Tujuan dari penelitian ini adalah mengetahui pengaruh kinerja mesin mesin diesel Yanmar L-40-E-DT terhadap kandungan karbon monoksida (CO) pada emisi gas buang. Pada pengujian ini dilakukan variasi pembebanan yaitu 750,1000 dan 1250 gram pada putaran mesin konstan 3000 rpm. Berdasarkan hasil penelitian dan pembahasan dapat diketahui bahwa Semakin besar pembebanan pemakaian bahan bakar kadar carbon monoksid naik dari 0 sampai 0,1 %. Perubahan Efisiensi thermal sangat mempengaruhi penurunan dan kenaikan unsur- unsur kimia yang terkandung didalam gas buang, Efisiensi Thermal 16,66 – 24,33%, menghasilkan carbon monoksid sebesar 0,1 %. Carbonmonksid yang dihasilkan oleh gas buang Mesin Diesel Yanmar L 40 sebesar 0,1% lebih kecil dari 0,3% masih dalam kondisi yang diizinkan, layak untuk dioperasikan. Kata kunci: Kinerja mesin, Emisi gas buang C
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
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