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Newton-Maxwell Journal of Physics
Published by Universitas Bengkulu
ISSN : -     EISSN : 27755894     DOI : 10.33369
Core Subject : Science, Engineering,
Astronomy Earth & Planetary Sciences Electrical & Electronics Engineering Mechanical Engineering Physics
Newton-Maxwell Journal of Physics is a scientific journal published by UNIB Press and managed by the Department of Physics, FMIPA University, Bengkulu, with ISSN Number: 2775-5894. This journal is published twice a year, in April and October, as a forum for lecturers, researchers, and students to publish their work. The scope of this scientific journal covers the field of physics in general, such as materials, theory and instrumentation, geophysics, acoustics, computer science, physics and its applications, and other relevant areas.
Arjuna Subject : Fisika dan Astronomi - Fisika dan Astronomi (Lain-Lain)
Articles 5 Documents
 1 
Search results for , issue "Vol. 2 No. 1: April 2021" : 5 Documents clear
Development of a New Data Processing System for Increasing the Accuracy of a Levitation Mass Method (LMM) based Measurement Eko Satria; Hendro Hendro; Yusaku Fujii; Mitra Djamal
Newton-Maxwell Journal of Physics Vol. 2 No. 1: April 2021
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1068.817 KB) | DOI: 10.33369/nmj.v2i1.15189

Abstract

Levitation Mass Method (LMM) is the method as a material tester to evaluate the mechanical response of general objects against impact forces. In this method, a mass is made to collide with material to be tested and the impulse, i.e. the time integration of the impact force, is measured highly accurately as a change in momentum of the mass. To realize linear motion with sufficiently small friction acting on the mass, a pneumatic linear bearing is used. The inertial force acting on the mass is calculated from the velocity of the mass. The velocity is determined, highly accurately by means of measuring the Doppler shift frequency of a laser light beam reflected on the mass using an optical interferometer. To determine the Doppler frequency shift for LMM data processing, the method for estimating the frequency is necessary. Several methods have been developed to estimate the frequency for the LMM data processing with high accuracy, i.e. Zero-Crossing Average Method (ZAM), Zero-Crossing Fitting Method (ZFM), Sine Wave Fitting, and Zero-crossing Sine Wave Fitting. All methods realized using the zero-crossing point of the waveform obtained from the digitizer. A better method to estimate frequency on the digitized waveform will enable higher precision for a more accurate result. In this research, a new method that can improve the accuracy has been developed. The program was developed using data segmentation to obtain the frequency of the digitized waveforms. The developed program has the smallest error ( 1,98 X 10^-10 for N= 200) compare to other methods (2,31 X 10-3 for ZAM; 1,10X10-3 for ZFM; and 8,69 X10-4 for Zero-crossing Sine Wave Fitting).
Preliminary research: Gas mixture flowrate detector based on acoustic measurement Melany Febrina; Eko Satria; Mitra Djamal
Newton-Maxwell Journal of Physics Vol. 2 No. 1: April 2021
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (581.487 KB) | DOI: 10.33369/nmj.v2i1.15198

Abstract

In preliminary research, a system for detecting the flow rate of the gas mixture (N2 and CO2) has been successfully built using acoustic measurements. This detector consists of a speaker as a transmitter of ultrasonic waves, and 3 microphones as a receiver of the ultrasonic waves. The quantity measured in this detection system test is the phase difference of the ultrasonic waves captured by the left and right microphones. The flow rate of the gas mixture will affect the phase difference value between the left and right microphones. With the increase of the flow rate of the gas mixture, the phase difference between the two microphones will increase. The flowrate range tested was between 0 and 0.8 l/min, with a concentration of 20% CO2 in the gas mixture of N2 and CO2. In testing this detection system, the absolute error is 2,4 10-2 l/min.
Sebaran Kualitas Air Laut di Perairan Sekitar PLTU Teluk Sepang Kota Bengkulu Berdasarkan Parameter Fisika-Kimia Lizalidiawati Lizalidiawati; Erma Juniarti; Budi Harlianto
Newton-Maxwell Journal of Physics Vol. 2 No. 1: April 2021
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (955.866 KB) | DOI: 10.33369/nmj.v2i1.15256

Abstract

PLTU Teluk Sepang Bengkulu City produces heat waste dumped back into the sea which affects the quality of the water so that it has a negative impact on marine life. This study aimed to identify the quality of the water around PLTU Teluk Sepang Bengkulu City based on the physical and chemical parameters. The method used was direct measurement at the research location which is carried out at 12 measurement points,i.e 4 points around the outlet area, and 8 points in the off-shore area. The measurement result was compared with seawater quality standard for marine biota based on the Minister of Environment Decree No. 51 of 2004 and was validated by analysis of sea water quality before the PLTU had operated. The result showed that the some parameters met the quality standards for marine biota included DO of 5.62-7.82, pH and turbidity in the offshore area with each value of 7.24-7.86 and 1.68-4.846 NTU. Meanwhile, the parameters which did not meet quality standards include a temperature of 30.62-36 ºC, a salinity of 26.6-30 ‰,  pH and turbidity around the outlet area with each value of  6.7-6.88 and 23.25-146.8 NTU. Based on the validation result, it showed that heat waste had a very significant effect on the physical and chemical parameters of the waters, especially on temperature, pH, and turbidity.
Analisis Pengaruh Perlakuan Kimia terhadap Morfologi dan Gugus Fungsional Serat Sisal Purwanto Purwanto; Arif Rakhman Suharso; Fajar Sari Kurniawan
Newton-Maxwell Journal of Physics Vol. 2 No. 1: April 2021
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1021.167 KB) | DOI: 10.33369/nmj.v2i1.15262

Abstract

Morphological and functional group analysis was carried out to study the appearance of micro and molecular structures contained in sisal fibers before and after chemical scouring and bleaching treatment. The scouring and bleaching process lasts for 1 hour with continuous stirring using a magnetic stirrer. Scouring was carried out with 6% NaOH solution while Bleaching was carried out with a solution of 10 g / L NaOH and 100 ml / L H2O2. Scanning Electron Microscopy (SEM) was used to identify the surface appearance and diameter of the fibers before and after the scouring and bleaching processes. Fourier transform infrared (FTIR) spectroscopy is used to identify functional groups in fibers. The Bleaching  process shows that the functional groups identified are the same as those of pure cellulose or alpha cellulose, namely -CH2, C-O, C = C, -CH3, C?C, and -OH, C-H. Sisal fibers with a diameter between 100 - 150 µm break down (fibrillate) into smaller fibers after the scouring (diameter: ?12 µm) and bleaching (diameter: ?7µm) processes. Thus, scouring and bleaching have caused significant changes in the morphological and microstructure of the fiber surface and also the functional groups that the sisal fiber has after the bleaching process is the same as pure fiber.
Alat Pelacak dan Pengaman Kendaraan Bermotor dengan Kendali Pesan Singkat Berbasis Arduino dan SIM900 Al Barra Harahap
Newton-Maxwell Journal of Physics Vol. 2 No. 1: April 2021
Publisher : UNIB Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (474.031 KB) | DOI: 10.33369/nmj.v2i1.15328

Abstract

Tindak kejahatan pencurian kendaraan bermotor, khususnya roda dua termasuk dalam kategori kasus yang tinggi ditangan kepolisian, jumlah kasus juga meningkat di masa pandemi covid-19 ini. Kendaraan bermotor roda dua sendiri sangat rentan dicuri dengan merusak lubang kunci motor. Oleh sebab itu, dilakukanlah penelitian ini yang bertujuan untuk merancang dan membangun alat pelacak dan pengaman kendaraan bermotor yang mudah dan murah. Alat yang dibuat berbasis mikrokontroler Arduino UNO dengan menggunakan modul SIM900 untuk komunikasi dengan pengguna. Sehingga, apabila terjadi pencurian, pengguna cukup mengirimkan SMS ke alat untuk mengaktifkan fitur GPS, alarm dan pemutusan daya listrik di kendaraan.

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