1,720,959 research outputs found
Automatic fault analysis in power systems via application service provider.
No full textThis dissertation presents a new approach to automated fault analysis in electrical power systems. New contributions to the fault and disturbance investigation topic are automated fault analysis service (AFAS) via application service provider (ASP) and remote relay testing service (RRTS). The implementation of AFAS complies with the new international standard of communication network and system in substations (IEC-61850). The signal processing approaches in an automated fault analysis service are based on the wavelet transform and empirical mode decomposition methods. Several case studies have been carried out to test the performance of the signal segmentation technique. The data for analyses are from simulated fault data and from real disturbance records obtained from the intelligent electronic devices (IEDs) in substations. The implementation of AFAS and RRTS was developed using C# with .NET technologies, MATLAB and open source software. Signal segmentation, signal modelling, fault type classification, fault location service, a web-based COMTRADE viewer and remote relay test service have been developed in this dissertation. Such services are designed to enhance manual investigations performed by engineers. The services have been tested extensively using disturbance records from power utilities and a power system simulation model.Thesis (Ph.D.) -- University of Adelaide, School of Electrical and Electronic Engineering, 201
The Combustion Behavior and Emission of the Carbonized Biomass-Lignite Blended Briquettes
No full textThe biomass briquette is an alternative energy resource for the home industries as well as the power generations in many countries. In this study, the combustion behavior and emission characteristic of bio-briquettes from carbonized biomass (e.q.; Rice-hull and teak wood) and lignite coal blended are comprehensively investigated. The biomass used in this study consists of 50% rice husk and 50% teakwood. The biomass (B) and lignite (C) were mixed together with a composition of 50% C/B, 70% C/B and 100% C/B respectively. All compositions were added with 30% binder from cassava. Each composition was selected 3 grams, 4 grams and 5 grams to be briquetted inside a cylindrical molding (17 mm diameter) and pressed under 100kg/cm2. The bio-briquettes are dried naturally at atmospheric temperature for 4 days before examined. The combustion performance and emission characteristics of each type of briquettes were investigated in a cylindrical combustion furnace equipped with measurement devices such as mass balance, thermocouple and exhaust gas analyzer. The burning rate and furnace temperature of each fuel composition were measured during the combustion process. An analysis was performed from the comparison of the data recorded in the form of graphs and tables. Emissions of the bio-briquettes combustion were examined using digital smoke analyzer, MEXA Analyzer, during the combustion process. The results of the study indicate that additional of the biomass carbonized into bio-briquettes offers the advantageous on combustion rate and emissions pollution. The rapid increase in the temperature in the combustion chamber was affected by the reaction rate between a fuel and oxygen as well as the size of fuel burned. The smaller the briquettes results in the faster the burning process and leads the higher the temperature in the combustion chamber
PENJELASAN EKSPANSI ALIRAN YANG MENYEBABKAN THE BETZ LIMIT DENGAN MENGGUNAKAN MODEL DISK THEORY
No full textEfisiensi maksimum turbin angin/air konvensional dikenal sebagai Betz Limit (0.59). Parameter batas ini ini nampaknya ini tidak hanya diakibatkan oleh cacat desain. Secara aerodinamis, beberapa referensi menjelaskan ekspansi aliran ke arah hilir dengan faktor dua terhadap daerah rotor menjadi penyebab dari fenomena batas ini. Meskipun banyak dari referensi ini menjelaskan faktor-faktor yang menyebabkan fenomena batas ini, pembahasan yang komprehensif mengenai alasan untuk ekspansi aliran tampaknya masih kurang dieksplorasi. Tulisan ini mencoba mendiskusikan lebih komprehensif mengenai faktor penyebab fenomena batas efisiensi, dengan menghubungkan dengan fenomena ekspansi aliran. Model matematika dari Teori Disk dengan menggunakan program simulasi MATLAB, digunakan dalam membantu untuk mencari faktor-faktor ekpansi aliran yang menyebabkan fenonena batas efisiensi. Hasil penelitian ini menunjukkan bahwa fenomena dari jumlah laju aliran masa melalui rotor yang dibatasi oleh kebutuhan untuk menghasilkan gaya Thrust pada rotor, adalah faktor yang menyebabkan fenomena batas efisiensi serta ekspansi aliran
ANALISIS FITUR FRAKTAL CITRA TERMOGRAM SEBAGAI PENDUKUNG DETEKSI DINI KANKER PAYUDARA
No full textDeteksi dini penyakit kanker payudara di Indonesia masih terkendala sejumlah persoalan sepertitingkat pendidikan, kondisi sosial ekonomi, pemahaman dan penanganan yang kurang tepat. Haltersebut menyebabkan 40% sampai 70% pasien kanker payudara datang ke dokter dal am statuskanker stadium lanjut. Pendeteksian dini kanker payudara adalah sangat penting untuk membantupenanganan penyakit kanker payudara secara cepat. Tujuan utama penelitian ini adalahmenganalisis fitur fraktal pada citra termogram untuk mendukung deteksi dini kanker payudara.Penelitian ini menggunakan citra termal jaringan payudara normal dan citra termal kankerpayudara. Tahapan-tahapan pada penelitian ini adalah pengolahan awal citra (preprocessing) yaitukonversi citra berwarna (RGB) ke citra skala keabuan (grayscale), pengubahan kontras, croppingobyek, proses binerisasi, serta ekstraksi fitur citra untuk menghitung dimensi fraktal. Hasilpenelitian menunjukan bahwa fitur fraktal yaitu dimensi fraktal dapat digunakan untukmembedakan antara citra termal payudara normal dengan citra termal kanker payudara. Dimensifraktal citra termal payudara normal lebih kecil yaitu 1,0725 sampai 1,2689 sedangkan pada citratermal kanker payudara yaitu 1,4581 sampai 1,8515
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
No full text“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
No full textWe 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
Pengembangan Dispenser Hand Sanitizer Automatis Terintegrasi Pendeteksi Suhu Tubuh untuk Pencegahan Penyebaran Covid-19
No full textThe increase in the number of patients who have tested positive for Covid-19 continues to increase very significantly from time to time and there is no certainty when this outbreak will end. Therefore, anticipatory and preventive steps are needed to overcome these problems. One of the efforts to prevent the spread of the Covid-19 virus is to regularly wash hands and use hand sanitizers. However, not everyone is able to prepare hand sanitizers and not all public places are provided with hand washing facilities and hand sanitizers, even if there are, special personnel (operators) are needed to spray sanitizer and check body temperature with a thermo gun from a very close distance, which of course is this. It is also very vulnerable to the transmission of Covid-19. The purpose of this activity is to design and manufacture and provide appropriate technology for hand sanitizers and body temperature detectors to break the chain of the spread of Covid-19. The method used in this activity is to design, manufacture and test automatic hand sanitizer dispensers and disseminate technology at the urban village office in Kendari City. This community service activity has succeeded in producing an automatic hand sanitizer product that is integrated with a body temperature detection system and this tool has been implemented in one of the Kelurahan offices in Kendari City.
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
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