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All Journal BERKALA FISIKA SAINS DAN MATEMATIKA YOUNGSTER PHYSICS JOURNAL JITEK (Jurnal Ilmiah Teknosains) Journal of Physics and Its Applications
Ketut Sofjan Firdausi, Ketut Sofjan
Departemen Fisika, Fakultas Sains Dan Matematika, Universitas Diponegoro, Semarang
Agriculture, Biological Sciences & Forestry Astronomy Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Veterinary

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Journal : YOUNGSTER PHYSICS JOURNAL

 1 
PENGUKURAN SIFAT OPTIS AKTIF BAHAN NAFTALENA DAN ANTRASENA DALAM MEDAN LISTRIK LUAR Fajri Inayat; Ketut Sofjan Firdausi
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Naphthalene (C10H8) and anthracene (C14H10) are simetric organic matter. Both of them predicted didn’t have electrooptic characteristic. That characteristic will appear if we induce them with external electric field. In the examination, it was used source light incandescent lamp 100 W. The external electric field generated by HV DC generator of 0-7 kV. The electrooptics characteristic was determined by measuring the change of polarization angle of light as it passed through the difference concentration of naphthalene and anthracene while they were applied by external electric field.Based on the result of observation,  change of polarization angle of the light was increasing at each different potential between naphthalene (range 0,30 – 10) and anthracene (range 0,10 - 0,70). Beside that, changes of polarization angle of the light was increase linearly to the increase of naphthalene concentration, while anthracene was not. These results consider for more research to do with alternative organic materials in photonic devices.
STUDI POLARISASI FLUORESENSI MENGGUNAKAN SAMPEL MINYAK SAWIT Aziel Nimrod Febriyanto; Ketut Sofjan Firdausi
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

This study was conducted to compare the changes in fluorescence polarization angle for fresh cooking palm oil, expired or used cooking oils with electrooptic method. The samples are one brands with a variety of palm cooking oil expired, two fresh palm cooking oil samples and two samples of used cooking oil. Used a green laser with a wavelength of 532 nm as light source. The results showed that most small changes in polarization angle experienced by the samples of fresh oil then becomes greater for expired and used cooking oil samples. The biggest polarization angle changes occur in used cooking oils and oil expired that shows the low quality of the sample. The results showed that the polarization by fluorescence is possible to be used as a complementary test oil quality parameter.
PENGUKURAN PERUBAHAN POLARISASI PADA AIR BERAS MENGGUNAKAN HAMBURAN MIE Wahyuni Wahyuni; Ketut Sofjan Firdausi
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Have been done scattering studies of rice water using polarization method with the light sources is a green laser with a wavelength of 532 nm and variations of the density of rice water. The test samples consist of three kinds of rice water obtained from different rice tipes.Change of scattering polarization direction is perpendicular to the incident light. Then observed the changes of scattering polarization angle seen in analyzer. The result showed that the scatttering polarization angle changes produced by the green laser in the rice water is increased to the amount of rice water particles. Then changes of scattering polarization angle in qualitative influenced by the size of rice water particles.
Metode polarisasi transmisi untuk deteksi cemaran lemak babi pada minyak goreng Nidia Kharisma Putri; Ketut Sofjan Firdausi; Heri Sugito
Youngster Physics Journal Vol 6, No 4 (2017): Youngster Physics Journal Oktober 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

This study was conducted to search for "fingerprint" of the existence of lard in vegetable  oil contaminated by lard as an evaluation of the halal of cooking oil by using transmission polarization method. The sample used was palm oil that has been mixed with chicken oil and lard. The light source used was green laser with wavelenght 532 nm. Measurement was conducted based on change of polarization transmission angle, with addition of external electric field produced by two parallel plates connected to 0-6kV DC voltage. The result shows that contaminated palm oil has greater polarization angle changes than pure palm oil. And  palm oil that has been contamined by lard has the greatest polarization angle than a pure palm oil and palm oil contaminated by chicken oil. Transmisson polarization method can be used to evaluate halal of cooking oil.Keywords: Polarization, Electrooptics,Cooking oil, Halal
Study of the most responsible parameters on polarization for powerful preliminary test of oil quality Ketut Sofjan Firdausi; Suryono Suryono; Priyono Priyono; Zaenul Muhlisin
Youngster Physics Journal Vol 7, No 2 (2018): Youngster Physics Journal April 2018
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

In this study, the most responsible parameters on polarization in total natural vegetable oils and fats have been investigated by determination of the relation between the polarization change and fatty acids (FA) composition. The change of light polarization was simply measured by using a pair of polarizer-analyser to indicate oil quality level, and the FA composition was obtained by using Gas Chromatography and Mass Spectrometer (GCMS) method. Various vegetable oils and fats were examined without any preliminary treatments. The experimental condition of the samples during measurement was assumed to be constant. It has been shown that various oils and fats have different angle of change of polarization, which indicates various oil quality level relative to each other, in agreement to the previous works. Especially for vegetable oils, high change of polarization has been considered as low quality of oil. The long chain of saturated fatty acids (SFA) and unsaturated fatty acids (UFA), which are distributed at third position (R3) and first position (R1) of triglycerides (TG) molecules, are responsible for the change of polarization and presented as a linear combination of the number of SFA or UFA. The result shows that the polarization could be used as powerful method for preliminary detection of oil quality level. The highest number of coefficient of C19:0 in lard indicates that this method has provided good prospect to evaluate the halal level of oil due to lard contamination.Keywords—polarization, triglyceride (TG), saturated fatty acid (SFA), unsaturated fatty acids (UFA)
PENGUKURAN PERUBAHAN SUDUT POLARISASI OLEH FLUORESENSI PADA SAMPEL MINYAK ZAITUN Nyadaniati Simbolon; Ketut Sofjan Firdausi
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The aim of this research is to show how the quality difference of cooking oil affect polarization angle changes of fluorescence. The fluorescence could be usefull to identify quality of matter according to colour changes. In this research, to identify fluoresence polarization changes edible and expired olive oil used as sample with different expired date. To produce fluorescence, a green laser with wavelength 532 nm pass by polarizer and produce polarized light. Analizer sets perpendicular to polarization plane. The result show that quality difference affect the fluorescence polarization changes. The worst quality of oil the higher polarization changes. Smallest polarization changes we get in the best quality edible olive oil as 50,90 and 61,60 for the expired one.
ANALISIS KUALITAS MINYAK GORENG BERDASARKAN NILAI GRADIEN PERUBAHAN SUDUT POLARISASI MENGGUNAKAN METODE ELEKTROOPTIS Ekasari Ekasari; Ketut Sofjan Firdausi
Youngster Physics Journal Vol 5, No 2 (2016): Youngster Physics Journal April 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Palm cooking oil quality testing has been done using natural polarization and electro-optics. Tests conducted to determine the quality of oil based active optical properties of the oil. The addition of external electric field aims to get the value of the polarization angle changes each brand oil. Oil samples were tested in the form of palm oil with a variety of brand new and has ditreatmen oil for frying foodstuffs. Test parameters after the addition of external electric field gradient that is of value elektrooptis. The test results, samples of oil to the value of large polarization angle gradient changes indicated have relatively low quality. Instead gradient small polarization angle, indicating high quality oil. Elektrooptis smallest gradient value of 0,51o/ kV, while the largest gradient value is 0,68o / kV. Keywords: polarization, elektrooptis, oil quality
PENGUKURAN PERUBAHAN SUDUT POLARISASI PADA KOLESTEROL SEBAGAI KOREKSI PADA MINYAK SAWIT Ulfa Maftukhah; Ketut Sofjan Firdausi
Youngster Physics Journal Vol 5, No 4 (2016): Youngster Physics Journal Oktober 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

This research aims to determine the relation between changes of polarization angle and increased levels of cholesterol and triglycerides on palm oil (expired palm oil, edible palm oil) to the change of polarization angle. Samples were placed on a polarimeter with a light source of 100 W incandescent lamp. The results showed that the increase in the cholesterol is directly proportional to the change in polarization angle. The greater increase of cholesterol levels result in the greater of the change of polarization angles that showed in the non linier graph. The value of the change of polarization angle in expired palm oil, edible palm oil are θ cholesterol = 0,26⁰; 0,25⁰ for cholesterol and θ triglycerides = 1,19⁰ ; 0,6⁰ for triglycerides, respectively. So it can be seen that the increase of each change of polarization angle of triglyceride which is the difference of θ total with θ cholesterol are affected by the increase of cholesterol levels in the cooking oils. The volatile property of the solvent and the less stabil environment temperature also could affected the result of the study.
Co-Authors Ahmad Kamil Ali Khumaeni Aziel Nimrod Febriyanto Azzahroh, Muffaricha Ekasari Ekasari Fajri Inayat Henik Rahmawati, Henik Heri Sugito I. Afiefah Izzah Afiefah M. Munir Maliki Maliki Michelson Fahrurazi Much Azam Much. Azam Muchammad Azam, Muchammad Nidia Kharisma Putri Nurhasanah, W Dewi Nurhasanah, Wahidatun Dewi Nyadaniati Simbolon Priyono Priyono Qidir Maulana Rahmawati, Aidah Ririn Widya Septianti S. Suryono Soesanto, Qidir Maulana Binu Sofia Mubarika Haryana Syifa Azahra Tiwiyaningsih, Tiwiyaningsih Ulfa Maftukhah Very Richardina Very Richardina Wahyu Setia Budi Wahyuni Wahyuni Winarno Winarno Zaenul Muhlisin