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All Journal BERKALA FISIKA SAINS DAN MATEMATIKA YOUNGSTER PHYSICS JOURNAL JITEK (Jurnal Ilmiah Teknosains) Indonesian Journal of Chemistry Journal of Physics and Its Applications Cendekia Journal of Pharmacy
Heri Sugito
Department Of Physics, Faculty Of Science And Mathematics, Diponegoro University, Jl. Prof. Soedharto, SH., Tembalang, Semarang 50275, Indonesia
Agriculture, Biological Sciences & Forestry Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Materials Science & Nanotechnology Mathematics Mechanical Engineering Medicine & Pharmacology Physics Veterinary

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DETEKSI DINI KUALITAS MINYAK GORENG DAN STUDI AWAL TINGKAT KEHALALANNYA MENGGUNAKAN POLARISASI ALAMI Eva, Yulianti; Indriyani, Y; Husna, A; Putri, N Kharisma; Murni, Sri; Amitasari, Ria; Putranto, Ari Bawono; Sugito, Heri; Firdausi, K Sofjan
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 3 Tahun 2014
Publisher : BERKALA FISIKA

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Abstract

In this paper, we investigate natural light polarization for preliminary test of quality and authentication (halal) level of frying oil. Recently standard methods used are usually based on Indonesian National Standard (SNI), however all parameters are very difficult to be determined simultaneously. On the other hands even the test is time consumed, inexpensive, complicated and also preliminary treatments required, which is a major problem in era of rapid information need. One of an alternative solution is to use natural light polarization method. In the experiment, several vegetable frying oils and animal oils are used to be tested. The change of polarization angle is used to indicate the level of oil quality and its authentication. The result shows that higher polarization indicates lower oil quality relative to the others, which is in agreement to the previous study. This method is, not only, able to differentiate various edible vegetable oils, but also to distinguish edible oils and expired oils. More over, it has a prospect to indicate an authentication of oil that is a subject of a halal or not-halal case.This method is relative simply, not time consumed, conducted accurately without any previous treatments, and it provides a good prospect as a preliminary test for oil quality and its authentication. Keywords: Natural polarization, oil quality, halal or authentication level
Aplikasi Portable Brix Meter untuk Pengukuran Indeks Bias Hidayanto, Eko; Rofiq, Abdul; Sugito, Heri
BERKALA FISIKA Vol 13, No 4 (2010): Berkala Fisika
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Abstract

Measurement of concentration of sucrose (C12H22O11) solution using Portable Brix Meter was analized to determine its refractive index using Abbe refractometer. The materials used are sucrose solution with a concentration of 5%, 10%, 15%, 20%, 25%, 30%, 35% and 40%, and samples fruits of pear, watermelon, orange, apple and melon and others. The concentration of sucrose solution is proportional to the refractive index. The increase of concentration of sucrose solution will increase the refractive index. Correlation between the concentration of sucrose solution with refractive index is expressed by the equation Refractive index of sucrose solution can be determined from its concentration. Keywords:  sucrose solution, concentration, refractive index, portable brix meter
KORELASI POLARISASI ELEKTRO-OPTIS DENGAN KOMPOSISI ASAM LEMAK PADA MINYAK ZAITUN SEBAGAI METODE UJI ALTERNATIF MUTU MINYAK GORENG Nurhasanah, W Dewi; Sugito, Heri; Richardina, Very; Azam, Much; Firdausi, Ketut Sofjan
BERKALA FISIKA Vol 22, No 1 (2019): Berkala Fisika Vol. 22 No. 1 Tahun 2019
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Abstract

In this study the quality of olive oil which has been degraded due to heating has been tested using the electro-optical transmission polarization method. The light source used was a laser pointer with λ = 650 nm. The degradation of the quality of olive oil was measured to be based on changes in the electro-optical polarization angle, while changes in the composition of fatty acids were tested using Gas Chromatography and Mass Spectroscopy (GCMS). The results showed that the polarization angle increases in second order polynomial on the increase in voltage and linearly on the heating duration in the sample which showed a decrease in the quality of homogeneous olive oil. Assuming that the polarization change is a linear combination of the main fatty acids from olive oil, it is obtained that C19:2 and C19:0 fatty acids are the most contributing to oil quality, that is, the reduction in oil quality is indicated by increasing polarization which is accompanied by an increase in C19:0 fatty acids and a reduction in C19:2 fatty acids. Whereas specifically for electro-optical polarization, in addition to C19:2 and C19:0 fatty acids, C19:1 also appears which slightly increases polarization by increasing the fatty acid. This method can be developed further for investigation into other vegetable oils, as well as evaluating halal oil due to contamination of lard.Keywords: Electro-optical polarization, olive oil, fatty acid composition, change inpolarization angle
Rancang Bangun Sistem Pengaturan Suhu Ruang Inkubator Bayi Berbasis Microcontroller AT89S51 Sugito, Heri; Suryono, Suryono
BERKALA FISIKA Vol 12, No 2 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A room temperature adjustment system for infant incubator has created using electrical sources phase controlling. This device used  to create environment temperature which is normal and stabile, as in mother’s uterus. The main component of room temperature of infant incubator adjustment which uses electrical sources phase controlling is 100 watt fluorescent hot source, temperature sensor LM 35, ADC 0804, microcontroller AT89S51, DAC 0808, Op-Amp LM 741, Phase detector (IC TCA 785), optical isolator (optocoupler), SCR, Pulse transformator, Coding 74LS47 and seven segment display. The temperature sensor, LM 35, perform data acquisition to room temperature of infant incubator. Furthermore, it strengthened and transformed by ADC 0804 to be digital data and read by microcontroller AT89S51. Reading value compared to accepted value, reading difference use for remove phase activator IC TCA 785 through DAC 0808. IC TCA as phase adjuster through trigger SCR TIC 106, it used to obtain temperature variation in heater lamp. The result is setting poin value with reading value have been as according with extinct indicator of lamp at infant incubator room.   Keywords: infant incubator, temperature, phase control, microcontroller.
Konduktivitas Listrik Pulp Kakao dengan Fermentasi dan Pengenceran Sugito, Heri; Mujasam, Mujasam
BERKALA FISIKA Vol 12, No 3 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Relation between hydrogen ion exponent (acidity) cacao pulp with energy pass electrics (conductivity) checked to know how ability of cacao pulp at various level of hydrogen ion exponents in sending electrics and also how relation between cacaoes pulps hydrogen ion exponents ably energies pass the electrics.Research done by two treatment that is prose process and fermentation of thinning of cacao pulp. Its way beforehand look for resistivity value (ρ) from cacao pulp. From the resistivity value obtained by conductivity value (σ) cacao pulp. If connected between cacaoes pulps hydrogen ion exponents with energies pass the electrics out of two the treatment, the result is progressively low degree of acidity of cacao pulp, energy pass the electrics is progressively decline.Relation between hydrogen ion exponent with electrics conductivity at cacao pulp at fermentation process yield equation = 2,84782 + 1,01789 e [-(x-2,5)/0,626)] and at thinning process yield equation σ = 3,13506 + 0,46513 e [-(x-2,5)/0,20194). On file energy at cacao pulp is known that longer ammeter galvanometer network is attached smaller the electric current so that the energy still be small.
Pengukuran Nilai  dan  Larutan Gliserin Terimbas pada Frekuensi PLN Firdausi, K. Sofjan; Lego, Dro Dwi; Sugito, Heri
BERKALA FISIKA Vol 10, No 4 (2007): Berkala Fisika
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Abstract

The magnetooptical specific rotary power h and frequence specific rotary power z have been measured in the glycerine through the interaction between external magnetic field modulated at 50-60 Hz and modulated laser light at the wavelength of 632,8 nm and 532 nm. The sample induced by the magnetic field that has the maximum value of 170 mT. The source of light of 632,8 nm and 532 nm is modulated between 30 Hz and 100 Hz. The result of experiment indicates that values of h and z at l = 632,8 nm are more dominant than at l = 532 nm.    Key words: magnetooptic, specific rotary power, resonance frequency
POLARISASI FLUORESENS PADA VIRGIN COCONUT OIL SETELAH MENGALAMI OZONASI Azzahroh, Muffaricha; Sugito, Heri; Richardina, Very; Azam, Much.; Firdausi, Ketut Sofjan
BERKALA FISIKA Vol 22, No 3 (2019): Berkala Fisika Vol. 22 No. 3 Tahun 2019
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Abstract

This study investigates interaction effects between ozone and Virgin Coconut Oil (VCO) on fluorescence polarization. The ozonation time variations carried out on VCO were 30 minutes, 60 minutes and 90 minutes with ozone flow rates of 0.6L / minute. The degradation of VCO quality due to ozonation was determined by measuring changes in the fluorescence polarization angle of the light emitted by the sample, using a green laser pointer with a wavelength of 532 nm. Typical fluorescence polarization characteristics in the range of polarization angle variations from  = 0 to  = 180 are in accordance with the results of previous studies. Increasing the length of ozonation in the sample results in an increase in fluorescence polarization. The average fluorescence polarization in the range 0    180 rises linearly over the duration of ozonation, which indicates that ozone interactions are quite effective in degrading the quality of VCO. The validation results also obtained that the duration of ozonation also increases the amount of free fatty acids, however it needs to be further investigated whether the amount of free fatty acids directly contributes to fluorescence polarization. The study of interaction of ozone in solution in biophysics and also its benefits for skin therapy in medical science are very interesting to be further conducted.Keywords: Fluorescence polarization, Virgin Coconut Oil, polarization angle
REVIEW PENGUJIAN HUKUM MALUS DAN SIFAT OPTIS AKTIF LARUTAN GULA MENGGUNAKAN SISTEM DETEKSI CAHAYA Amitasari, Ria; Istiyawan, Wardono; Sugito, Heri; Bawono P, Ari; Firdausi, K Sofjan
BERKALA FISIKA Vol 16, No 1 (2013): Berkala Fisika
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Abstract

Abstract In this paper, we review the test results of Malus’ Law and optical activity of sugarsolution using a system light detector. Two polarizers were used in the experiment to serve thechoice of a certain direction of electric field of light and to determine the change of polarizationangle. The change of transmitted intensity were measured using LDR detector which was thenacquisitioned by microcontroller and displayed via LCD and computer using  Microsoft Visual Studio C#. The experiment result is in agreement to the Malus’ Law with correlation coefficient of 0.99, and by using the equipment we obtain linearity between the change of polarization angle andconcentration of sugar solution, which is appropriate to the theory, as well. The specific rotarypower is (54±2) o/dm(g/mL) in the experimental uncertainty.Keywords: Malus law, change of polarization angle, light detector
Studi Interferometer Fabry-Perot Untuk Pengukuran Panjang Gelombang Cahaya Satoto, Dwi; Sugito, Heri; Firdausi, K. Sofjan
BERKALA FISIKA Vol 10, No 4 (2007): Berkala Fisika
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Abstract

In this experiment, an interferometer Fabry-Perot method has been used to measure wavelength of diode laser. The first step is to calibrate the micrometer displacement using He-Ne laser in order to measure the diode and He-Ne wavelength. By shifting movable mirror, the transition of interference fringe in counted against the displacement of movable mirror. For the result of measurement, it is obtained for the wavelength of the red diode laser of, and green diode laser of.   Key word: Interferometer Fabry Perot, multiple beam interference.
Aplikasi Transduser Ultrasonik Jenis Immersion Transducer Untuk Karakteristik Media Cair Dan Pengukuran Tingkat Kekasaran Permukaan Beton Sugito, Heri; Suryono, Suryono; Layla, Diana
BERKALA FISIKA Vol 12, No 4 (2009): Berkala Fisika
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Abstract

Research of the application of ultrasonics for liquid medium characteristic and measurement of level of surface roughness of concrete have been done using immersion transducer. This purpose of research is to know characteristic some dilutions based on the atanuasi coefficients and measure surface roughness of concretes based on time of flight. In this research applied by ultrasonic transducer with frequency of 1 MHz.  At attenuation method, awakened ultrasonic signal through pulse generator and connected at transmitter transducer. Ultrasonic wave which transmitted through liquid medium will experience received finite attenuation of receiver. Media liquid which applied is oil and cooking oil. At method time-of-flight, measurement done with object scan which turned around counted 200 rotation apply motor stepper. Object which applied as component of test that is concrete. Reason of selec,choose it this specimen is to minimize attenuation so that will enlarge the bound. Transducer will transmit modulation to object through modulation transmiter and receiver. Result from scanner is presented at CRO ( Cathode Ray Oscilosco). Research result to liquid medium sample showing existence of tendency of increase of attenuation value for ex-oil- and ex-cooking oil if each compared with oil was new and new cooking oil. From measurement of level of surface roughness, obtained by is surface roughness average yield of  concrete A ( Radium of a minimum of 10%, and Ra maximum 16%), and concrete B ( Radium of a minimum of 8%, and Ra maximum 17%). This research result give hope that this method can be developed for inspection innoxious at solid and liquid medium.   keyword : Ultrasonic, attenuation coefficient, level of crudity, Time of Flight
Co-Authors A Husna, A Abdul Rofiq Ali Khumaeni Ari Bawono P Ari Bawono Putranto Asep Yoyo Wardaya Azzahroh, Muffaricha Diana Layla Diana Layla Riskawati Dro Dwi Lego Dwi Satoto Eko Hidayanto I. Afiefah Izzah Afiefah K Sofjan Firdausi K. Sofjan Firdausi K. Sofjan Firdausi K. Sofjan Firdausi Ketut Sofjan Firdausi, Ketut Sofjan Kiichiro Kagawa Lilik Eko Jatwiyono Much Azam Much. Azam Muchammad Azam, Muchammad Mujasam Mujasam N Kharisma Putri, N Kharisma Nasrullah Idris Nidia Kharisma Putri Nidia Kharisma Putri Nurhasanah, W Dewi Nurhasanah, Wahidatun Dewi Nyadaniati Simbolon Qidir Maulana Rahmawati, Aidah Ria Amitasari Ririn Widya Septianti Setyoningrum, Aqilatul F.D. Soesanto, Qidir M.B Soesanto, Qidir Maulana Binu Sri Murni Suryono Suryono Syifa Azahra Tiwiyaningsih, Tiwiyaningsih Very Richardina Very Richardina Wahyu Setia Budi Wardono Istiyawan Y Indriyani, Y Yulianti Eva, Yulianti