IOSR-JAP   Volume-14 ~ Issue-3 ~ May – Jun. 2022

ABSTRACT: This work is focused on the comparison of optical and electrical characteristics of the most widely used photosensors in light measurement and light detection systems which include; photoresistor, photodiode and phototransistor in terms of linearity and sensitivity. Therefore, to intuitively compare their characteristics, an attempt was made by developing a light intensity measuring device which has ability to interface with the three sensors simultaneously. The device is a single system which can measure the intensity of incident light falling upon a surface, and also the current and voltage generated by each sensor when been illuminated by a light source.........

Keywords: Light intensity, linearity, sensitivity, photoresistor, photodiode, phototransistor, arduino-microcontroller, current, voltage

[1]. Antii, N. Bachelor's Thesis "Photodetector Amplifier and Measurement Setup Design". Metropolia University of Applied Sciences, Finland. 2021; 5-12. http://www.metropolia.fi/en
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[5]. Kazi M. F. S. Automatic Headlight Controlling of Vehicle using Ambient Light Sensor Based on Phototransistor. 2021;1-7. doi:10.14293/S2199-1006.1.SOR-.PP8OYBC.v1.

ABSTRACT: Gamma scanning is a very useful technique to monitor the health of the process equipment. It provides the insights of the equipment in operational condition which helps to decide on the shutdowns, reduce the downtime, maintain the standard quality product supply chain and thus, avoid the huge financial losses. A Demethanizer column separates the methane from feed LNG in a petrochemical plant. The column was able to operate only at 95% of the design feed rate without disturbing the process parameters. As the feed rate was increased slightly, the pressure drop across the column was increasing drastically.......

Keywords: demethanizer column, gamma scanning, process equipment, scanline, tray

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[2]. Yelgaonkar, Vivek, Agrahari, Gaurav, Vikrant, Dhakar, Prasanna, Rao and Pathak, B. K. "Flow dynamics study of catalyst powder in catalytic cracking unit for troubleshooting" Nukleonika, vol.62, no.4, 2017, pp.277-283.
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[5]. Aquino, Denis D., Mallillin, Janice P., Sulit, Ramoncito F., Hila, Frederick C., Nuñez, Ivy Angelica A. and Bulos, Adelina D. M. "Performance evaluation of a rectifier column using gamma column scanning" Nukleonika, vol.62, no.4, 2017,

ABSTRACT: The scattering of electromagnetic wave by a spherical particle was first presented using the Mie formulation. The parameters needed to describe the characteristics of the radiation scattered by the particles were derived. The parameters include the Mie coefficient an and bn, the scattering, absorption and extinction efficiencies, the cross section for radiation pressure and the asymmetry factor <cos >. The behaviour of these parameters was investigated as functions of the dimensionless size of the particle . Experimental value was obtained from radiation pressure measurements on a levitated oil droplet with refractive index of m= 1.29. It was found that the various efficiency factors are related to the optical property of the scattering.......

Keywords: Scattering, Absorption, Extinction, Mie coefficient

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ABSTRACT: AC conductivity and the related dielectric properties of bulk Coumarian-6 (C6) dye have been investigated as a function of temperature in the 303–403 K temperature regime and 50 Hz to 1 MHz frequency regime. The frequency dependence of AC conductivity follows the Jonscher universal dynamic law . The change of the frequency exponent (s) with temperature was analyzed in terms of different conduction mechanisms; It is found that the correlated barrier hopping (CBH) model is the dominant conduction mechanism. The behavior of σac(ω) increases with increasing temperature and frequency. It has been found that AC activation energy decreases with increasing frequency. The frequency dependence of the dielectric constant (ε′) and dielectric loss (ε″) for bulk C6 has been studied using the complex permittivity. It is found that ε′ and ε″ are decreases with increasing frequency and increases with temperature. The dielectric modulus shows the non-Debye relaxation in the material. The extracted relaxation time by using the imaginary part of modulus (M″) is found to follow the Arrhenius law..

Keywords: Coumarin; Ac Conductivity; Dielectric properties; organic semiconductor

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ABSTRACT: This research carried out the design, construction and performance analysis of locally made portable wind turbine for domestic applications. Today, world is immensely seeking clean, renewable and cost effective energy to reduce greenhouse gases, which problem is becoming a global issue. Constructing a small wind turbine provides useful quantity of environmental friendly energy, to supply houses and workshops, without ejection of carbon-monoxide into the atmosphere. The conversion of kinetic energy in form of mechanical energy is transformed to generate electrical energy by vertical axis wind turbine, derived from 12 Volts car alternator. The car alternator used differs from.......

Keywords: Wind, Turbine, electricity, renewable energy, car alternator

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