1,720,968 research outputs found
ANALISA PERBANDINGAN EFISIENSI LAMPU YANG MENGGUNAKAN BALAST MANGNET DAN ELEKTRONIK
Full text linkAbstrak: Pemakaian energi listrik semakin diharapkan dan diarahkan ke penggunaan energi yangefektif dan efisien untuk hasil yang maksimal. Khusus pada sistem penerangan, penggunaan lampuflorent atau yang biasa disebut lampu TL dirasakan sangat bermanfaat, baik untuk penerangan rumah,perkantoran maupun untuk keperluan industri. Pengujian peralatan rangkaian bertujuan untuk mengujiefek perubahan penggunaan balast magnetik dan balas elektronik terhadap efisiensi lampu sehinggadapat dimengerti tentang karakteristik kedua macam balast tersebut. Dalam pengujian ini akandidapatkan data-data yang diperlukan untuk perbandingan dan penganalisaan secara teori sesuaidengan alat yang akan diuji. Pada saat penyalaan ke dua jenis balast tersebut terdapat perbedaan,dimana dari hasil pengukuran didapatkan jenis balast magnetik daya lampu sebesar 18 W dengan jenislampu TL, arus start 0,28 A dan arus yang mengalir 0,20 A. Untuk jenis balast elektronik daya lampu18 W jenis lampu excellent arus start 0,20 A dan arus yang mengalir 0,17 A, Cos φ yang dihasilkanpada balast elektronik 0,98. Sedangkan untuk balast magnetik Cos φ 0,50. Untuk efisiensi lampu padabalast elektronik 90% sedangkan untuk balast magnetik sebesar 59,8%.Kata Kunci: Efisiensi Lampu, Balas Magnetik, Balas Elektroni
STUDI SISTEM MONITORING POWER JARAK JAUH PADA JARINGAN SELULER PT. SMARTFREN TELECOM PALEMBANG
Full text linkPower supply adalah salah satu faktor yang menentukan didalam operasional sistem telekomunikasi seluler.Kualitas power menentukan kehandalan perangkat telekomunikasi, oleh sebab itu gangguan kelistrikan harus mendapatpenanganan lebih awal agar tidak mengakibatkan gangguan yang berdampak pada layanan seluler kepada pelanggan.Untuk menjaga agar sistem power dilokasi-lokasi BTS yang tersebar dapat dimonitor secara terpusat dansepanjang waktu (real time), dibuatlah suatu sistem monitoring power jarak jauh yang berfungsi memantau, kendali danmanajemen semua perangkat rectifier yang tersebar diremote area yang disebut Sistem Monitoring Power Jarak Jauhatau Power Elemen Management System via radio gelombang mikro.Kelemahan menggunakan Radio Gelombang Mikro adalah rentan terhadap gangguan yang disebabkan olehperubahan cuaca (udara) layaknya sistem komunikasi radio secara umum, sehingga berpengaruh terhadap tingkatkehandalan sistem monitoring power jarak jauh.Dalam tulisan ini akan membahas dan menganalisa penyebab terjadinya kegagalan proses penyampaianinformasi yang dikirim oleh rectifier di remote area menuju pusat monitoring via radio gelombang mikro dengan metodestudi kasus pada satu lokasi tertentu yang telah ditentukan sebagai bahan studi untuk mendalami proses pengirimaninformasi menggunakan perangkat radio gelombang mikro beserta faktor yang mempengaruhi kehandalannya.Kata Kunci : Link Budget, Path Calculation, RSL (Receive Signal Level), Fade Margi
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
Studi Pengaruh Penambahan Kapasitor Shunt pada Sistem Kelistrikan 150 KV Lampung utara
Full text linkKualitas tegangan dalam sistem tenaga listrik merupakan hal yang penting untukmenjaga kehandalan sistem tenaga listrik pada jaringan 150 kV. Batasan operasi untuktegangan tinggi (150 kV) yaitu -10% dan +5% dari tegangan nominal. Dilakukan 20 simulasidengan kapasitor 5, 10, 15 dan 20 MVAr di Gardu Induk Blambangan Umpu, Gardu IndukBukit Kemuning, Gardu Induk Kotabumi, Gardu Induk Menggala, dan Gardu IndukGumawang. Jatuh tegangan di Gardu Induk Gumawang dari 131,81 kV (-12.13 % daritegangan nominal) menjadi 136,47 kV (-9.02 % dari tegangan nominal) dengan pemasangankapasitor 15 MVAr di Gardu Induk Gumawang.Voltage quality in electric power systems is essential to maintaining the reliability of thepower system 150 kV network. Operating limits for high voltage (150 kV) is -10% and +5%of the nominal voltage. Conducted 20 simulations with capacitor 5, 10, 15 and 20 MVAr atBlambangan Umpu substation, Bukit Kemuning substation, Kotabumi substation, Menggalasubstation, and Gumawang substation. Voltage drop in Gumawang of 131.81 kV (-12.13%of nominal voltage) to 136.47 kV (-9.02% of the nominal voltage) with the installation of 15MVAr capacitors at substation Gumawang
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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