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A Broadband Microwave Metamaterial Absorber with Octave Bandwidth
MAPAN - Tập 31 - Trang 299-307 - 2016
In this paper, a broadband metamaterial absorber has been presented for practical applications. The unit cell of the proposed structure comprises metallic patch of single circular split-ring imprinted on top surface of a metal-backed dielectric substrate. The geometrical dimensions of the structure have been optimized in such a way that the structure exhibits broadband absorptivity response of 9.1......
Improving the Measurement of Volume Fraction of Multiphase Fluids Based on Attenuation of Gamma Rays Without the Use of Artificial Intelligence
MAPAN - Tập 36 - Trang 869-874 - 2021
Nowadays, multiphase fluid flowmetry is of great importance in the industry. The most important parameter required for multi-phase fluid flowmeter is the volume fraction of each phase. In this study, three flow regimes (annular, stratified and homogeneous) for two-phase (liquid–gas) as well as three-phase (liquid–liquid–gas) to determine the volume fraction of phases with use gamma-ray attenuation......
The uncertainty of parallel model coordinate measuring machine
MAPAN - Tập 26 - Trang 47-53 - 2011
The Stewart platform is one of 6-DOF (6 degrees of freedom) parallel mechanism. A parallel mechanism is a mechanism to connect six actuators in parallel between the base and the stage. It is necessary to calibrate the kinematic parameters that compose the mechanism in order to use the parallel mechanism as the coordinate measuring machine. Additionally, it is necessary to estimate the uncertainty ......
Realization of Negative Gauge Pressure Standard in the National Metrology Institute of Indonesia
MAPAN - - 2019
Accurate negative gauge pressure measurement is the key factor for many scientific and industrial applications such as clean room technology, medical treatment, and pharmaceutical production. However, there are not much publications regarding to the technical guide when it comes to negative pressure measurement, although several comparison of negative gauge pressure has been performed in Europe. I......
Development of scanning measurement of tooth flankform of generated face mill hypoid gear pair with reference to the conjugate mating tooth flank form using 2 axes sensor
MAPAN - Tập 26 - Trang 55-67 - 2011
The three diamensional (3D) scanning measurement method of tooth flank form of generated face mill gear pair is proposed, which is based on the conjugate mating tooth flank form. In this method, deviation sensor is placed at the position which has certain offset from the gear axis and synchronized to the gear rotation. This method realizes the 3D tooth flank form measurement and multi points scann......
Effect of Illumination Systems on Statistical Texture Parameters Based Clustering and Discrimination of Machined Surfaces Using Machine Vision
MAPAN - Tập 34 - Trang 197-205 - 2018
Inspection of surface quality using machine vision is based on the principle of surface characterization using texture parameters deduced from intensity values of images captured by the system. Illumination system plays significant role in deciding the performance and robustness of machine vision by controlling quality of image acquisition. This paper presents an experimental study of the effect o......
Review on Classification, Sources and Management of Road Dust and Determination of Uncertainty Associated with Measurement of Particle Size of Road Dust
MAPAN - Tập 36 - Trang 909-924 - 2021
Precise and accurate determination of particle size distribution (PSD) and compositional analysis is of prime importance for road dust management as most of the dust after collection is dumped on the adjacent side of the road or landfill sites. In this manuscript, we have compiled the scattered information about the dust classification, sources, PSD, polyaromatic hydrocarbons (PAHs), traces metals......
Assessment of Air Quality Before and During COVID-19-Induced Lockdown in Jaipur, India
MAPAN - Tập 38 - Trang 363-373 - 2023
Air pollution is increasing at a frightening pace due to emissions from industrial plants and manufacturing activities and other anthropogenic activities affecting living beings, property, and environment. This study aims to monitor the impact of COVID-19-induced lockdown and unlock down phases on the air quality of Jaipur city, Rajasthan, India by assessing the change in ambient air quality durin......
Manual / automated capacitance box using micro-controller technique
MAPAN - Tập 26 - Trang 105-113 - 2011
A capacitance box contains more than one decade capacitance. These decades have different capacitance ranges to get a much wider range of the capacitance steps obtained by the whole box. In general, a decade capacitance is constructed by ten capacitors to give ten manual capacitance steps. In this paper, a new design of a capacitance box is presented using two-decade capacitances. Each one of them......
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