1,720,961 research outputs found
Single Phase Inverter Circuit Based on Frequency Variation For Controlling The Speed of a Capacitor Motor
Full text linkThis research is aimed to build a single phase inverter circuit as a speed controller for a single phase induction motor which operates based on the variation of frequency. In this circuit, the variation of frequency is developed by an oscilator which work by the variation of the value ratio between a capacitor and a resistance. The capacity of the capacitor is choosen constant while the value of the resistence is varied by a potentiometer. The performance of this circuit is then examined to drive a single phase induction motor capacitor start and run tipe in no load and loaded conditions. The result showed that this inverter circuit can control the speeds of the capacitor motor proportionally to the stator voltage frequencies. The others motor quantities such as motor voltage, current, power, and slip also observed in this study. The result showed that the other motor quantities namely motor voltage, current, power also increased as the motor frequency is increased. Keywords: single-phase, inverter-circuit, frequency, oscilator, capacitor-motor
RANGKAIAN PENYEARAH SETENGAH TERKENDALI TIGA FASA UNTUK PENGENDALIAN KARAKTERISTIK MOTOR ARUS SEARAH SHUNT
Full text linkA modern control of electric motor’s speed in an industry needs a variable direct voltage. The variable direct voltage can be supplied by semiconductor devices such as SCR. The output voltage of a SCR rectifier depends on the delay angle of theSCR. The aim of this research is to make a SCR rectifier circuit and applying it for observing the characteristics of a shunt directcurrent motor. The result shows the circuit can work to demonstrate the shunt motor characteristics
PERBANDINGAN KONSUMSI DAYA OLEH ALAT PENGATAUR KECEPATAN MOTOR UNIVERSAL YANG MENGGUNAKAN METODE MODULASI LEBAR PULSA (PWM) DAN METODE TAHANAN DEPAN
Full text linkMotor universal adalah sebuah motor seri berukuran kecil dengan kapasitas daya pecahandan sub pecahan daya kuda yang dapat dioperasikan baik pada sumber tegangan bolakbalikmaupun tegangan searah. Pengaturan kecepatan motor ini dapat dilakukan denganmetoda modulasi lebar pulsa maupun metoda tahanan depan. Tujuan penelitian ini adalahuntuk membandingkan daya yang dikonsumsi oleh alat pengatur kecepatan pada keduametode ini. Hasil percobaan menunjukkan bahwa untuk putaran motor dan torsi yang sama,alat pengatur kecepatan dengan metoda modulasi lebar pulsa menkonsumsi daya yang lebihsedikit dari metoda tahanan depan
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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