1,720,968 research outputs found
Pengaruh Campuran Bahan Bakar Oli Bekas dan Biosolar Terhadap Emisi Gas Buang pada Mesin Diesel Modifikasi: Analysis of The Effect of Modified Diesel Engine Power With Mix of Used Lubricants and Biosolar On Exhaust Emissions
No full textThe Production Laboratory of the Department of Mechanical Engineering, University of Riau has modified the diesel engine used as a used oil-fueled generator, the problem is the exhaust gas emissions produced, namely the opacity exceeds the quality standard that has been set. The purpose of this study was to determine the calorific value of a mixture of used fuel oil and biodiesel, to determine the relationship between the power generated from the diesel engine as a generator and the emissions produced. This research was conducted by direct measurement of the emissions produced by the diesel engine using a gas analyzer, by operating the diesel engine for 30 minutes and measuring emissions every 5 minutes. This study also varied the power load, namely at idle conditions of 0 W, 1000 W, and a maximum power of 2000 W. The calorific value was tested using a bomb calorimeter. The emission test results from the Dongfeng Model R175 diesel engine which uses a mixture of used fuel oil and biodiesel as fuel show that the CO, CO2, HC and Opacity emissions released on average increase with the length of operating time of the diesel engine and the highest emissions occur when power of 2000 W. The highest level for CO emissions is 0.0161%, for CO2 emissions is 3.53%, for HC emissions is 28.61 ppm, and for opacity is 44.85 % for B30 fuel when the engine is running. operates with a power load of 2000W. The Opacity value of this variation of fuel has exceeded the quality standard that has been set in accordance with Attachment 1 of PERMEN LH No. 5 of 2005 by 40%, but emissions from other variations are still below the quality standard.Laboratorium Produksi Jurusan Teknik Mesin Universitas Riau telah memodifikasi mesin diesel yang digunakan sebagai genset berbahan bakar oli bekas, permasalahannya adalah emisi gas buang yang dihasilkan yaitu opasitas melebihi baku mutu yang telah di tetapkan. Tujuan penelitian ini adalah mengetahui nilai kalor dari Campuran bahan bakar oli bekas dan biosolar, mengetahui hubungan antara daya yang dihasilkan dari mesin diesel sebagai genset dengan emisi yang dihasilkan. Penelitian ini dilakukan dengan cara pengukuran langsung emisi yang dihasilkan mesin diesel dengan menggunakan alat gas analyzer, dengan mengoperasikan mesin diesel selama 30 menit dan pengukuran emisi setiap 5 menit sekali. Penelitian ini juga memvariasikan beban daya, yaitu pada kondisi idle 0 W, 1000 W, dan daya maksimum sebesar 2000 W. Nilai kalor diuji dengan menggunakan alat bomb calorimeter. Hasil uji emisi dari mesin diesel Dongfeng Model R175 yang menggunakan campuran bahan bakar oli bekas dan biosolar sebagai bahan bakar menunjukkan emisi CO, CO2, HC dan Opasitas yang dikeluarkan rata – rata naik dengan seiring dengan lamanya waktu operasi dari mesin diesel dan emisi tertinggi terjadi saat daya sebesar 2000 W. Tingkat tertinggi untuk emisi CO sebesar 0,0161%, untuk emisi CO2 adalah sebesar 3,53%, untuk emisi HC sebesar 28,61 ppm, dan untuk opasitas sebesar 44,85 % pada bahan bakar B30 pada saat mesin beroperasi dengan beban daya 2000W. Nilai Opasitas bahan bakar variasi tersebut telah melebihi baku mutu yang telah di tetapkan sesuai dengan Lampiran 1 PERMEN LH No 5 Tahun 2005 sebedar 40 %, namun emisi dari variasi lain masih berada di bawah baku mutu
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
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
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
PEMETAAN TINGKAT KEBISINGAN DAN ANALISIS WAKTU PEMAPARAN MAKSIMUM PADA INDUSTRI PENGOLAHAN KARET
Get PDFKegiatan produksi pada industri pengolahan karet menghasilkan suara bising dari penggunaan mesin. Kebisingan yang ditimbulkan tersebut berpotensi menyebabkan penyakit akibat bekerja salah satunya ketulian. Tujuan penelitian ini adalah untuk mengukur nilai kebisingan yang dihasilkan dari penggunaan mesin dan membandingkan dengan Permenaker No. 5 Tahun 2018 sebagai nilai ambang batas tingkat kebisingan, pemetaan tingkat kebisingan dan menghitung waktu terpapar kebisingan maksimum yang diperbolehkan berdasarkan tingkat kebisingan yang didapat. Metode penelitian dengan pengukuran kebisingan secara grid dengan 178 titik pengukuran dan perhitungan waktu pemaparan dengan persamaan NIOSH. Hasil penelitian menunjukkan tingkat kebisingan terendah 53 dB dan tertinggi sebesar 91,1 dB. Terdapat 27 titik yang telah melebihi nilai ambang batas tingkat kebisingan sebesar 85 dB. Waktu pemaparan kebisingan yang diperbolehkan pada titik 73, sebagai titik kebisingan tertinggi hanya selama 117 menit. Dari pemetaan kebisingan diketahui pola sebaran tingkat kebisingan yang digunakan sebagai dasar upaya pengendalian kebisingan. Kata Kunci: tingkat kebisingan, pemetaan kebisingan, NIOSH, industri pengolahan karetÂ
EVALUASI TINGKAT KEBISINGAN DI BANDARA SULTAN SYARIF KASIM II PEKANBARU
Get PDFTingginya tingkat mobilisasi dan perkembangan Pekanbaru menuju kota metropolitan beberapa tahun belakangan berhubungan langsung dengan pertumbuhan aktivitas transportasi, termasuk tranportasi udara. Bandara Sultan Syarif Kasim II menjadi bandara internasional mengakibatkan aktivitas bandara yang semakin tinggi. Aktivitas bandara Sultan Syarif Kasim II Pekanbaru berpengaruh terhadap peningkatan kebisingan dikawasan Bandara, sehingga diperlukan penelitian tentang kebisingan akibat aktivitas pesawat terbang. Perhitungan tingkat kebisingan sesuai dengan Keputusan Menteri Lingkungan Hidup No. 48 tahun 1996 dan Keputusan Menteri Tenaga Kerja No. 51 tahun 1999. Perhitungan menunjukkan Tingkat kebisingan tertinggi di kawasan Bandara Internasional Sultan Syarif Kasim II berada di landasan pacu selatan yaitu 88,63 dBA, sedangkan tingkat kebisingan terendah berada pada titik apron timur yaitu 77,72 dBa. Hasil perhitungan diketahui bahwa lama bekerja paling singkat berada di landasan pacu selatan, maksimal bekerja yang diperbolehkan pada daerah tersebut hanya 3,46 jam. Maksimal bekerja terlama di apron timur selama 43,05 jam. Oleh karena itu pekerja disekitar daerah yang memiliki kebisingan yang tinggi harus menggunakan Alat pelindung diri untuk mengurangi dampak kebisingan yang dihasilkan dari aktivitas Bandar
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