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All Journal BULETIN FISIKA Jurnal Nasional Teknik Elektro dan Teknologi Informasi
D.J. Djoko H.S.
Universitas Brawijaya
Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Physics

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Identification of Free Radical in Main Stream Cigarette Smoke in Cigarette with Clove mix (Kretek) and Cigarette without Clove mix (White) Ni Kadek Nova Anggarani; D.J. Djoko H.S.; Unggul P. Juswono
BULETIN FISIKA Vol 21 No 2 (2020): BULETIN FISIKA
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

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Abstract

Cigarette smoke is a source of free radicals. Cigarette smoke is a component of Aerosols and free gases that contain large amounts of chemical compounds. Cigarette smoke can be divided into two: main smoke and side smoke. The main smoke of cigarettes inhaled by smokers is known to cause a buildup of harmful substances and causes of oxidative stress so that research is carried out using ESR Leybold Heraeus. The sample used is a smoke sample from two types of cigarettes that are popular in Indonesia. The measurement is done by pulling smoke directly into the measurement tube. Then the resonance pattern is observed and the external magnetic field is calculated and the value of the lande factor is based on frequency and current data. Measurements result showed resonance in both types of cigarettes, at a frequency of 32.4-70.8 MHz and obtained values of lande factors that vary and have a value between 1.9-2.1 with two acquisition values that are outside the range that is 1.8368; and 2.2060. There are differences in the number of resonances that occur for each sample. This difference can be due to differences in the constituent of content and the texture of cigarettes which can affect the results of the combustion process.
Metode Flyback pada Pembangkitan Tegangan Tinggi untuk Aplikasi Plasma Electrolytic Oxidation Kumala Mahda Habsari; Wijono; D.J. Djoko H.S.
Jurnal Nasional Teknik Elektro dan Teknologi Informasi Vol 6 No 3: Agustus 2017
Publisher : Departemen Teknik Elektro dan Teknologi Informasi, Fakultas Teknik, Universitas Gadjah Mada

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Abstract

Flyback is one of high voltage generation methods using a low voltage source. This method has a simple circuit, which consists of two main components for generating the high voltage. In this study, flyback method is used to generate high voltage on plasma electrolytic oxidation (PEO) application. PEO is a process that combine electrochemical oxidation process and high voltage spark. This application needs high voltage to produce plasma. The plasma is used to form a new surface coating on metal. Flyback circuit is succesfully simulated on LTSpice IV. Voltage value and waveform on simulation has been observed and compared with the real one. The measured and observed part is IGB gate, output voltage of transformer before diode, and load voltage after diode. Flyback effect and waveform on simulation has the similiar result with the real one. A 10 volt input voltage can produce output voltage on the average of 1 kilovolt. Therefore, flyback simulation is able to represent flyback ability on real circuit for generating high voltage which can be used on high voltage generation for PEO application.
Co-Authors Kumala Mahda Habsari Ni Kadek Nova Anggarani Unggul P. Juswono Wijono