1,720,966 research outputs found
TIME-DEPENDENT DIELECTRIC BREAKDOWN CHARACTERIZATION OF A HIGH VOLTAGE CAPACITOR
Full text linkNXP Semiconductors Business Unit (BU) Automotive is a corporate organization that provides design technology for the automotive product creation process. The assignment for this internship is to create a high voltage Time-dependent Dielectric Breakdown (TDDB) measurements setup for testing the high voltage capacitors inside galvanic isolation. The project starts with designing the schematic, selecting the right component and doing PCB layout for the measurement setup, adapting the software for the automation, and also doing TDDB measurement on the capacitor. From the TDDB measurement, it is expected we will be able to predict the reliability and lifetime of these capacitors. The lifetime of this capacitor is important, due to this product will be applied in car which requires a long lifetime.
From the results of investigating the measurement, breakdown value for negative voltage is smaller than positive voltage. The pads of the package have a sharp point (like a needle) which involved a strong electric field at this point. Tiling and floating metal 3 make the breakdown voltage become smaller. This is because tiling is pieces of metal which reduce the total thickness of inter metal dielectric. Failure analysis shows the damage always happen at the sharp corner, due to sharp electric field in this area. 1,6mm on PCB board wire spacing is too small for high voltage breakdown measurements above 1,6kV.
Keywords : TDDB, capacitor, reliability, failure, lifetim
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
PENGGUNAAN PC SEBAGAI SISTEM MONITORING MESIN DAUR ULANG PLASTIK BEKAS DENGAN PLC SEBAGAI KONTROL OTOMATIS
Full text linkPada dunia industri dan automatisasi, kebutuhan akan sistem dan kontroler yang baik, efektif dan efisien adalahsuatu keharusan. Sebagai suatu kontroler PLC dapat memberikan solusi yang diinginkan. PLC memiliki kelebihan,diantaranya dapat diprogram, mudah diprogram, program dapat diubah-ubah, sederhana dalam wiring, kompak,lebih kuat terhadap kondisi lingkungan dan mudah dalam troubleshooting.Dalam penelitian ini , PLC digunakan sebagai kontroler pada sistem mesin daur ulang plastik bekas. Dimana nantinya akan menghasilkan biji plastik dengan proses produksi menggunakan auto loader sebagai pengisian bahan baku secara automatis, heater untuk melelehkan bahan, screw untuk membawa bahan dari heater ke nozzle, pompa membuat sirkulasi air tetap terjaga suhunya dan penarik, menarik tali plastik untuk dipotong. Borland Delphi 6.0digunakan sebagai sistem monitoring, yang dapat mengontrol dan memonitor sistem kerja mesin daur ulang secarareal time.Dari pembuatan dan analisa didapat hasil bahwa dengan menggunakan kontrol automasi akan mempermudah operator untuk memonitoring sistem kerja mesin secara real time. Delphi dapat berkomunikasi dengan baik pada PLC sebagai pembuatan visual simulasi mesin.</p
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
- …
