1,720,971 research outputs found
Electric field study of silicon rubber insulator using finite element method (SLIM)
Full text linkSilicone rubber provides an alternative to porcelain and glass regarding to high voltage (HV) insulators and it has been widely used by power utilities since 1980’s owing to their superior contaminant performances. Failure of outdoor high voltage (HV) insulator often involves the solid air interface insulation. As result, knowledge of the field distribution around high voltage (HV) insulators is very important to determine the electric field stress occurring on the insulator surface, particularly on the air side of the interface. Thus, concerning to this matter, this project would analyze the electric field distribution of energized silicone rubber high voltage (HV) insulator. For comparative purposes, the analysis is based on two conditions, which are silicon rubber insulators with clean surfaces and silicon rubber insulators with contamination layer taking place over its surfaces. In addition, the effect of water droplets on the insulator surface is also included. The electric field distribution computation is accomplished using SLIM software that performs two dimensions finite element method. The finding from this project shows that pollution layer distort the voltage distribution along the insulator surface while different pollution layer material and variation in zone of incidence would contribute different profile of electric field. Existence of water droplets would create field enhancement at the interface of the water droplet, air and silicon rubber material. Also, the intensification field created by water droplet is depending on the droplets size, number of droplets and the proximity of water droplets to each othe
Energy status: Malaysia vs world
No full textThe whole world is now concerned about the energy as the continuous demand has great growth [1]. Across the globe, researches are being done and investments also have been increased to this regard to discover new sources for energy as well as to improve the efficiency of the existing systems. There are several number of energy scenarios suggested by several organizations such as the International Energy Agency (IEA), the United States Energy Information Administration (US EIA), World Energy Association (WEA), Renewable Energy Policy Network for the 21st Century (REN21), International Energy Agency (IEA), Nuclear Energy Institute and Energy Commission, Malaysia [2-4]. All scenarios depict energy generation capacity, consumption and foresee future demand by 2050. Based on different surveys and analyses suggested by these organizations, countries all over the world are following some trends and agenda items that are relevant to new energy and energy-related developments in regionally diverse systems. Renewable energy sources are the focus of the energy world in this matter. The visualizations shown here are the global production of renewable energy over the long-term. The generation and capacity of the whole world have been discussed by different fuels. Moreover, comparative, and analytical data of several countries regarded to energy are provided
Simulation study of automatic voltage regulator system by using PID and MRAC controller
No full textThe applications of Automatic Voltage Regulator (AVR) had been widely used in past decades. Precise and fast responsive controller is needed for AVR because most of the electrical equipment are sensitive to the voltage level. Majority of the devices that connected to the grid have its own desired voltage level, or so-called nameplated value for proper functioning. The problem arises when the voltage level fluctuates or beyond the operation limit of electrical equipment, it will affect the performance and case comes to the worst, the equipment will be damaged seriously [1]. Therefore, the demand of having precise controller is increasing lately..
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
Analysis of wireless power transfer using resonant inductive coupling method
No full textNowadays, the wireless power transfer technology receives intense attention among the people, especially the people who like to travel or always use gadget. It is a technology that exploits electromagnetic, magnetic and electric field to transmit electric power without conductor which eliminates the use of current carrying wires. As wearable technology becoming increasingly integrated into our daily lives, an innovative electrical supply is required to ensure power is supplied in more manageable, comfortable and safe without charging using wires. The wireless power transfer offers convenient application with variety of method to transfer the electrical energy instead used the connecting wires. There are several approaches for transferring the electric power wirelessly. Wireless power transfer methods are divided into two categories according to the distances of the transmitted power which are near-field and far-field techniques ..
Development of solar powered food truck with security monitoring system
No full textDue to global decline in fossil fuel reserves and contribution on their emissions (during the extraction, production and utilization process) to climate change, many countries including Malaysia are now examining their national energy policies with a view of shifting toward low-carbon and renewable sources of energy. Solar energy is the most promising backup energy as it has many advantages over other resources. Solar energy is a naturally available and clean energy source derived from sun that can be exploited directly to generate electricity [1]. No release the pollutant, low maintenance and high reliability with life span expectation of 20 – 30 years made solar power a favourable source energy to be used in the future .
MCB earth leakage fault detection scheme based on global system for mobile communication using Arduino Uno
No full textElectrical safety and hazard were always taken as a priority during the utilization of home appliances. Some people that are not aware of the electrical safety inspection will initiate fault and produce an electrical shock [1]. Each home will be provided with a home distribution board to distribute the current to all the loads in the house. The electrical energy that flows from the distribution board will get consumed by home appliances when the switch inlet is turned on
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
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