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Now a days microstrip patch antennas are heavily used in the field of communication for their compact size, low cost, flexibility and efficiency. Different shapes and sizes of patch antennas are available in the market. In this paper effect of split ring resonator on rectangular patch array antenna of 5.2 GHz is discussed. It is seen that the multiple frequencies with different gain, return loss,...
Microstrip patch antennas are heavily used in the field of communication for their compact size, low cost, flexibility and efficiency. Different shapes and sizes of patch antennas are available in the market. In this paper comparison between triangular patch antenna of 5.88 GHz and annular ring triangular patch antenna is done. It is seen that the Return Loss is increased by 57.4% whereas Gain is...
Despite the rapid progress in III-nitride-based laser diodes, sub-300 nm UV semiconductors lasers have not been realized yet, mainly due to technical and scientific barriers arising from the lack of proper crystalline substrates and poor understanding of defect control in the wide bandgap semiconductors. In addition to low dislocation density, reduction in non-radiative centers and compensating point...
Major Prerequisite to overcome the problem due to the insulation breakdown in High Voltage (HV) power apparatus is the efficient diagnosis of partial discharge (PD). Many different methods have been proposed by researchers for detection and measurement of PDs in past, based on different outcomes of PD such as Chemical, Acoustic, Electrical, Optical and Electromagnetic (EM) wave radiation. Among these,...
Metamaterial based reconfigurable fractal body worn antennas are special kind of antenna through which low frequency, multiband, low Specific Absorption Rate (SAR), miniaturize antenna can be designed. Metamaterial is a kind of defect that can be created either in ground, substrate or other places of antennas. All metamaterial based antennas are known as left handed material antenna where permittivity...
Cryogenic system in fusion research tokamak integrates many components, i.e., heat exchangers, valves, cold circulating pumps, cold compressor etc., in various configurations for the cooling of superconducting (SC) magnets like Toroidal Field (TF), Poloidal Field (PF) and Central Solenoid (CS). Helium refrigerator/liquefier (R/L) serves as a source of cold power for the cryogenic cooling of magnets...
Measurement of Partial Discharge (PD) in High Voltage (HV) power apparatus has become an emerging issue. It helps to provide prior warning before sudden failure of the apparatus. The measurement of PD in HV power apparatus and in any electrical systems helps to reduce the down time including saving of money. For large and complex apparatus apart from PD measurement, it is also mandatory to find out...
This paper deals with the project execution experience of ITER-India, the agency for delivery of India's ‘inkind’ contributions to ITER. We look at the changes that have occurred so far and are being incorporated during the construction or manufacturing of the systems in some of the packages. As these systems are linked through the interfaces with other systems (beyond the scope of ITER-India), one...
High Voltage (HV) power apparatus are usually, the most critical and costly component in any power system. Sudden failure of such component leads to unwanted interruptions and catastrophic losses. Partial Discharges (PD) are reported as main reason for degradation of insulation system in any HV power apparatus. A successive occurrence of such discharges eventually leads to complete failure of the...
DC motor can be replace by Induction motor by controlling speed of induction motor under different conditions but it required fast dynamic response. The speed of the motor must be maintained in permissible range, under varying load condition in the system. But to compensate the speed of motor it requires prior knowledge of the load characteristics. Although external load applied on the machine and...
In-homogeneities, impurities, weakness within the insulating material or improper positioning of the electrode across insulator causes uneven electric field distribution into the localized area, which often creates partial discharge (PD) and are common mainly in high voltage power apparatus. After initiation of partial discharge into the localized region, it starts damaging the whole insulator with...
As a developing nation and as the second most populous country in the world, India faces unique problem that require unique solution. One such problem is that of traditional waste management systems like periodic and routine clearing by the various civic bodies like the municipal corporation. But even though these routine maintenances are carried out, it is often seen that garbage overflowing from...
To date, there have been no consumer reports on the quality or long-term reliability of photovoltaic products, so buying modules can be a dicey and pricey undertaking. Even a module that looks good to the average customer may have tiny defects in lamination or soldering that, over time in the field, will become micro cracks or even overheat - requiring expensive repairs or full replacements. This...
The hearing impaired community has traditionally found itself marginalized from the mainstream of the society. While, this can partly be attributed to the inability of the hearing impaired persons to fluently communicate orally, it is also true that traditional education has not been able to reach out to them by addressing their special needs and requirements. In this paper, we report on the development...
Two extensively used methods for time-frequency analysis are short time Fourier transform (STFT) and Wigner distribution (WD). It is a well known fact that STFT suffers from the tradeoff between time and frequency resolution, whereas time-frequency resolution is better in case of WD. However Wigner processing gives rise to significant amount of sidelobes which makes interpretation of its output difficult...
Managing production today is a challenge to the managers, due to uncertainties in demand, availability of resources, customer satisfaction and competition. The decision-making in production planning is difficult when the environment is fuzzy in nature and vague. The problem of Product Mix is considered in this paper, for a real life industrial problem, to determine the mix of products to maximize...
Literature review shows more than hundred works on supplier selection issues. However, very few attempts have been made to measure qualitatively and quantitatively supplier's selection criteria for mass customization. Considering the growing need for mass customization, an attempt has been made in this paper to measure qualitatively and quantitatively supplier's selection criteria for make-to-stock...
In this paper the Product Mix optimization is considered using the Takagi-Sugeno Method. The fuzzy inference system, implemented in the frame work of adaptive networks, is through soft computing. The system uses an architecture called Adaptive-Network-based Fuzzy Inference System (ANFIS), which generates a set of fuzzy if-then rules (human knowledge or natural language) with an appropriate membership...
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