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Karakterisasi sistem pembangkit aliran elektrohidrodinamika lucutan korona positif berkonfigurasi elektroda kawat-bidang Sumariyah Sumariyah; Azzuma Hasna Azzulkha; Muhammad Nur; Zaenul Muhlisin
Youngster Physics Journal Vol 6, No 2 (2017): Youngster Physics Journal April 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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The characterization of electrohidrodynamic flow generation system (EHD) has been performed utilizing positive corona discharge configured wire-plate electrode. In this study, the characteristics of the EHD flow generation system in the form of current characteristics as a function of voltage or I-V characteristics with fixed geometry factor, in the without of lubricating oil and with the lubricating oil. The fixed geometry factor was obtained from the radius of the fixed point (r) electrode with various the electrode distance (d). This research was conducted by using positive corona incandescent discharges with wire field electrode configuration. The wire electrode used is made of stainless steel having a length of 5 cm, with wire diameter 0.11 mm, 0.14 mm, 0.21 mm, 0.36 mm, and 0.38 mm. Electrode of field used in the form of circle with diameter 20 cm. Data collection system with variation of voltage, variation of electrode distance, and variation of wire electrode diameter used. Furthermore, data analysis of measurement results was carried out. From the result of characteristic research of EHD flow generator system in the form of current as a function of voltage shows that the increase of voltage is proportional to current increase. While the current as a function of geometry shows the value of the current flowing inversely proportional to the geometry factor of the electrode distance change.Keywords:electrohydrodinamic, ion wind, positive corona discharge

Pengaruh Ozon yang Dibangkitkan Melalui Reaktor Plasma Berpenghalang Dielektrik Elektroda Silinder Spiral Terhadap Pengawetan Cabai Saraslifah Saraslifah; Muhammad Nur; Fajar Arianto
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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Research on the effects of ozone generated by the plasma reactor cylindrical spiral electrode to the shelf life of chili has been done in Plasma Physics Laboratory, Diponegoro University. This study aims to obtain optimal voltage values to produce maximum ozone. And obtaining effect of ozonation time and storage for chili quality. Ozon which used is produced by dielectric barrier discharge plasma reactor with spiral cylinder configuration. This ozon , which produced by the reactor dissolved in water for washed the chili. Chili using ozone washing is done with a variety of washing time 0,5,10,15,20,25 and 30 minutes. The chili then stored in a refrigerator at a temperature of 17 ℃ for 25 days. Characterization of the reactor showed that the greater value of the applied voltage, increased current and concentration of ozone produced. Voltage used for ozonantion is 2400 V with a concentration of ozone generated at 23.75 ppm. Ozone dissolved in water to wash the chili with dissolved ozone concentration is 1.66 ppm or 7%. From the analysis of the level of damage chili, ozonation results with lowest damage rate is at the time of treatment 15 minutes with a percentage of 8% damage to the shelf life of 25 days. From the test results of proximate preservation chili using ozone is not particularly affect the content in chili peppers that is safe to use. The longer the treatment time, reduce the amount of bacteria on pepper growing. At thetime of treatment 15 minutes colonies of fungi reduced til 50,8 % and bacteria were reduced 51.7%. It seen from the results of TPC (Total Plate Count).

Analisis mobilitas pembawa muatan pada lucutan plasma korona positif konfigurasi kawat silinder menggunakan gas nitrogen Victor Prima Saputra; Muhammad Nur
Youngster Physics Journal Vol 7, No 1 (2018): Youngster Physics Journal Januari 2018
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Research on mobility of charge carries in positive corona plasma have been done by using a cylindrical wire configuration and nitrogen gas field. Plasma reactor that used in this research is a stainless tube with a length of 24 cm and a diameter of 3.5 cm. The characterization of current and voltage is used to determine the value of charge carrier mobility. This characterization was performed using nitrogen gas field. The voltage variation used was 0-11 kV with an increase interval of 0.3 kV and the flow of Nitrogen flow of 2-6 L / min with an increase interval of 1 L / min. From the research for positive corona obtained the highest charge carrier mobility at flow rate 2 L/minute equal to 0.115 ( m^2)⁄Vs and lowest charge carrier mobility at flow rate 3 L/minute equal to 0.0413 ( m^2)⁄Vs. At flow rate 2 L/minute the mobility between positive and negative corona have significant difference of 0.115 ( m^2)⁄Vs and 0.459 ( m^2)⁄Vs then decreased until finally at the gas flow rate 6 L/minute of positive coronas and negative corona have equal charge carrier mobility of 0.093 ( m^2)⁄Vs.Keywords: Plasma corona, characteristic current-voltage, the mobility of the charge-carriers, voltage, current

Penentuan sudut arah angin ion pada lucutan korona positif berkonfigurasi elektroda titik-bidang Sumariyah Sumariyah; Maryam Restiwijaya; Muhammad Nur
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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Determination of the ion wind angle of positive corona discharge with point to plane electrode geometry configuration has been done. Point electrode was made from stainless steel with various radiuses of 0.26 mm, 0.28 mm, 0.35 mm, and 0.47 mm. The plane electrode with circle form was made from stainless steel with diameter of 20 cm. Determination of the ion wind angle was carried out by measuring the current, the radius of deformation of lubricating oil at various voltage, electrode spacing, and the radius of the point electrode. The results showed that the angle of the ion wind direction is affected by a given voltage, the distance between electrodes, and the radius of the point electrode. Value of the ion wind flow direction angle is inversely proportional to the distance between the electrode and the radius of the point electrode. When the voltage is increased, the angle of ion wind direction will be larger but would reach saturation at the region of corona discharge which is close to the arc discharge.Keywords: Ion wind, positive corona discharges, point to plane electrode.

Analisis mobilitas pembawa muatan pada lucutan plasma korona negatif konfigurasi kawat silinder menggunakan gas nitrogen BN Michael GP; Muhammad Nur
Youngster Physics Journal Vol 7, No 1 (2018): Youngster Physics Journal Januari 2018
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Carbon mobility analysis has been carried out on plasma corona discharge of negative of cylindrical wire configuration using nitrogen gas. The study was conducted using a 24 cm long stainless steel cylinder and an iron wire stretched to the center in a cylindrical tube with a wire length of 24 cm. Both ends of the cylinder are closed using an insulator material and given the input and output holes of the gas. The nitrogen gas flowrate used is 2 L / min to 6 L / min at intervals of 1 L / min and the applied voltage is from 0 kV until arc discharges occur at 0.3 kV intervals. The characterization of the negative corona discharge plasma reactor was carried out to determine the initial stresses for the emergence of currents as a sign of the operation of the reactor, the final stresses for knowing arc discharges, reactor working areas, and the relation of currents to stress for gradient values. The result of this characterization is obtained by charge load mobility 4.59x10-1 m2/V.s at 2 L / min flowrate, 9.29x10-3 m2/V.s at flowrate 3 L / min, 1.15x10-1 m2/V.s at a flowrate of 4 L / min, 4.13x10-3 m2/V.s at a flowrate of 5 L / min, and 9.29x10-3 m2/V.s at a flowrate of 6 L / min. The result of this negative corona charge discharging mobility is compared with a positive corona discharge study. From this comparison it can be concluded that the mobility of negative corona discharge charge carriers at 2 L / min flow discharge is higher than positive discharge, while at 6 L / min flowrate the negative and positive corona charge discharge charge is equal. Keywords: Plasma corona negative, cylinder wire, charge carrier mobility, nitrogen gas, voltage, current

Karakterisasi reaktor plasma lucutan berpenghalang dielektrik berkonfigurasi elektroda spiral-silinder dengan sumber udara bebas Istiqomah Istiqomah; Muhammad Nur; Fajar Arianto
Youngster Physics Journal Vol 6, No 3 (2017): Youngster Physics Journal Juli 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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A research about characteristics of the plasma reactor dielectric barrier discharge gas filling the air. Plasma reactor in this research was prepared by component an electrode in the form of copper wire wrapped with a number of turns as much as 72 coil and coil diameter 25,05 mm, pyrex tube with a length of 30 cm, a diameter of 3 cm, and a thickness of 2,45 mm as a dielectric barrier, and the outer electrode in the form of cooper sheet the loaking the pyrex tube. This characterization is done by the air stream into the reactor without sample. Input voltage variation used 0,2-1,4 kV at intervals rise of 0,2 kV and the air flow rate 1-10 L/min with intervals increase of 1 L/min. The results of the characterization of current and voltage is obtained, the greater the measured current with increasing voltage and air flow rate given. The result of the characterization can be used to calculate the value of the charge carrier mobility, and the charge carrier mobility values obtained on the air flow rate 1-8 L/min increased along with the increase in air flow rate. Mobility values in the lowest obtained by air flow rate 2 L/min and the highest air flow rate 8 L/min at 2,59 x 10-5 m2/Vs and 6,08 x 10-5 m2/Vs. In addition, there are also ozone measured from the reactor stuffing free air, and obtained the maximum ozone concentration in the air flow rate of 10 L/min at 191,698 ppm.Keywords: the plasma dielectric barrier discharge, ozone, mobility of the charge carriers

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