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All Journal International Journal of Electrical and Computer Engineering TELKOMNIKA (Telecommunication Computing Electronics and Control) BULETIN FISIKA
I Wayan Supardi
Universitas Udayana
Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Environmental Science Materials Science & Nanotechnology Physics

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PERANCANGAN ALAT UKUR KANDUNGAN GAS CO PADA GAS BUANG KENDARAAN BERMOTOR MENGGUNAKAN SENSOR MQ-7 BERBASIS MIKROKONTROLER AT89S52 I Gede Didi Jimbarwan; I Wayan Supardi; Nyoman Wendri
BULETIN FISIKA Vol 14 No 2 (2013): 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

It has designed and developed a measurement tools CO gas in emissien gas of motor vehicle using MQ-7 based of AT89S52 microcontroller. The system AT89S52 microcontroller as the main processor, LM 741 as a voltage amplifier, ADC 0804 as the voltage converter into digital data, LCD as a display, and using basic language as a software. From the measurement using ten motorcycles obtainable R2 values 0,983 ?? between the tool and the reference.
Effects of Photosynthetic Activity Radiation (PAR) on Green Mustard Plant Growth (Brassica rapa var. parachinensis L.) Ni Nyoman Ratini; I Wayan Supardi; Yuli Nurfadhillah
BULETIN FISIKA Vol 20 No 1 (2019): 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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A research on the effect of photosynthetic active radiation (PAR) on the growth of green mustard plants has been conducted. The radiation source used is sunlight. Samples have been grouped as a sample which treated by red filter (P1), by orange filter (P2), by purple filter (P3), by green filter (P4), by blue filter (P5) and a sample without filter as a control (P0). Each sample consisted of four plants. The planting was carried out using polybags with compost media. Observations were made from the nursery phase to the slow vegetative phase (day 3rd, when all plants had grown shoots until day 63rd of the harvest). Parameters measured include light intensity, plant height and number of leaves. Measurement is done every three days. Also it measured plant biomass on the last day of observation (63rd day). The results showed that the intensity of each sample had an impact on the harvest. The best growth rate is obtained in P2, both in the nursery phase and fast vegetative phase i.e. 0.119 cm/day and 0.194 cm/day, respectively. While the highest growth rate was obtained in the P3 sample, namely the slow vegetative phase (0.035 cm/day). Overall the best planting results were obtained in P2 samples with plant height of 23.18 cm, number of leaves of 12 strands and plant biomass of 33.56 g.
PERANCANGAN ALAT UKUR GAS HIDROKARBON (HC) DENGAN MENGGUNAKAN SENSOR MQ-4 BERBASIS MIKROKONTROLER AT89S52 I Nyoman Gede Putra Wibawa; I Wayan Supardi; I Gusti Agung Putra Adnyana
BULETIN FISIKA Vol 17 No 1 (2016): 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

It has been designed a hydrocarbon gas measuring instrument using the sensor MQ-4. Gas levels were detected by the sensor is processed for display on seven segment through several circuits, the sensor circuit, comparator circuit, non-inverting amplifier cicuit, ADC0804 circuit, the minimum system microcontroller AT89S52, and a circuit of seven segment multiplexing. The entire circuit is powered by a power supply 5 VDC, -15 VDC and +15VDC. The measurement range of measuring instruments is ranging from 0 ppm to 131 ppm. The workings of this measuring instrument utilizes the characteristics of the sensor MQ-4 that has a change of output voltage proportional to the change of gas levels were detected. Comparator circuit is used to adjust the sensor output voltage to be 0 volts when measured 0 ppm HC gas. Because the change of the output voltage is small, that is 2 mV, it would require 10 times voltage gain to make the changes of the output voltage can be converted into digital data by the ADC0804, then the conversion result is sent to microcontroller. The data received by microcontroller AT89S52, then processed into the output levels of the gas that displayed on seven segment. Compatibility between measuring instrument and reference instrument were obtained from linear regression analysis of data from test the measuring instrument that is equal to 99,9%.
Alat Monitoring Suhu Melalui Aplikasi Android Menggunakan Sensor LM35 dan Modul SIM800L Berbasis Mikrokontroler ATMega16 I Kadek Agus Sara Sawita; I Wayan Supardi; I Gusti Agung Putra Adnyana
BULETIN FISIKA Vol 18 No 2 (2017): 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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It has been successfully designed a temperature monitoring instrument through android application using LM35 sensor and SIM800L module based on ATMega16 microcontroller. The temperature is measured using a LM35 sensor which produces a voltage and sent to ADC. Microcontroller ATMega16 is using as the main processor of this monitoring instrument to calculate the program, so that analog data in the form of input voltage are converted into digital data form a measurable temperature. The measurable temperature is sent and saved in the database on the server computer using the SIM800L module so it can be displayed on the website. The website pages are accessed with android programs that installed on the smartphone so that measurable temperature data can be monitored using a smartphone. The measurable temperature results can be displayed on a 2x16-character LCD in the instrument designed. Compatibility of monitoring instrument with comparison instrument is 99,97 %.
RANCANG BANGUN ALAT PENDETEKSI KETINGGIAN KOLOM CAIRAN INFUS MENGGUNAKAN SENSOR POTENSIOMETER DAN BERBASIS MIKROKONTROLER AT89S52 Putu Ayu Adi Susanti; I Wayan Supardi; K.N. Suarbawa
BULETIN FISIKA Vol 17 No 2 (2016): 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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It has been made a detector of the column height of the infusion fluid using by potensiometer sensor based on AT89S52 microcontroller. This detector was compiled by potensiometer, ADC0804, microcontroller AT89S52, seven segment, buzzer, and LED. The infusion fluid that used to calibrate the potensiometer sensor and the device’s working system was Otsu-NS infusion, while the infusion fluid that used to examine the device’s working system were aminovel infusion and NaCl infusion. The results of the present research were the device has conformity between system and aminovel infusion was 99.69% and 98.75% for NaCl that gained from linear regression analysis of device’s calibration data.
PERANCANGAN SISTEM PENGISIAN BATTERY CHARGER DENGAN PEMBANGKIT LISTRIK TENAGA ANGIN Wayan Supardi; G.A Putra Adnyana; K. N Suarbawa; K. P. Wibawa
BULETIN FISIKA Vol 15 No 1 (2014): 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

A system of fillng charger using wind-powered electricity has been made. A battery charger system using a four cornered windmill powered by a generator as the mean to change the movement energy from the windmill in to electricity. The current produced by the generator before it enters the battery is connected to the clain of chargers which fills the battery charger. Battery charger keeps electrical energy the battery charger will be filled when the current output from the generator is greater than 6,00 volt, if it is less than 6,00 volt it will not be filled. The length of time to fill cannot be determined because if depends on the speed of the relation of the generator.
ALAT PENCATAT TEMPERATUR OTOMATIS MENGGUNAKAN TERMOKOPEL BERBASIS MIKROKONTROLER AT89S51 Nyoman Wendri; I Wayan Supardi; K N Suarbawa; Ni Made Yuliantini
BULETIN FISIKA Vol 13 No 1 (2012): 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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An automatic temperature reader has been made by using a thermocouple based on microcontroller AT89S51. The automatic temperature works in range 0°C-66°C which has 6,07% linierity. The sensors of thermocouple works by detect changes of heat, producing in difference of voltage which then will be read by microcontroller AT89S51. The detection data given, will then be send into a PC for it to be further analyzed and finally-shown. The program used for this is Visual Basic 6. The relationship of voltage and temperature is interpolasi polynomial.
RANCANG BANGUN KLINOSTAT 2-D DENGAN PEROTASI MOTOR DC D06D401E I Made Oka Guna Antara; I Wayan Supardi; Ni Nyoman Rupiasih
BULETIN FISIKA Vol 17 No 2 (2016): 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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It has successfully developed a 2-D clinostat using a DC motor rotation D06D401E. The tool has angular velocity (?') of 1.67 to 93.53 rpm with changes intervals of 1.67 rpm. The reading of angular velocity is performed by DI-REV#1 module, the reading of data by the ATmega16 microcontroller on timer/counter T1 PortB.1 and 2x16 LCD as a data display. The accuracy of the angular velocity which compared by a digital tachometer DT-2234C + (?'ref) is 99.91%. The input voltage to a DC motor supplied by a variable power supply with range of 0-5 VDC, with the linearity between power and angular velocity of 99.13%. At the smallest value of the angular speed of 1.67 rpm obtained a Relative Centrifugal Force (RCF) of 4.68´10-5 g.
Pengaruh Eksposi terhadap Kualitas Citra Radiografi Berdasarkan Ketebalan Objek pada Pemeriksaan Abdomen Efrensiana Ana Melti; I Gde Antha Kasmawan; I Wayan Supardi
BULETIN FISIKA Vol 25 No 1 (2024): BULETIN FISIKA February Edition
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2024.V25.i01.p07

Abstract

Research has been done on the effect of exposure on the quality of the radiographic image based on the thickness of the object on abdominal examination. The thickness of the object has an impact on the amount and at least the amount of exposure used, which will affect the quality of the resulting image. The data used in this study is quantitative data, namely numerical data that can be calculated. The source of data used in this study is primary data obtained directly from 28 patients through measurements of abdominal thickness, tube voltage and current and time recorded on X-ray radiographs. This study used an anteroposterior (AP) supine projection at random on abdominal examination patients from the age range of 40-60 years. The age ranges are made in three year intervals, namely 40-42, 43-45, 46-48, 49-51, 52-54, 55-57, 58-60 years. The results showed that the thicker the size of the abdomen, the use of exposure will increase. Image quality will decrease if the exposure index (IE) value is not optimum (the optimum IE value is around 1000 to 2000). In this study, the highest IE value obtained was 2189 and the lowest IE value was 965, and both values ??were not optimum. For the highest IE value (2189), the image obtained is darker in color while for the lowest IE value (965), the image obtained is white and blurry.
Pengaruh Ikat Silang Glutaraldehid Terhadap Morfologi Nanofiber Komposit PVA/Chitosan/Kolagen Ria Yuliani; Dewa Ayu Sukma Pranastia; Ni Nyoman Rupiasih; I Wayan Supardi; K N Suarbawa
BULETIN FISIKA Vol 25 No 1 (2024): BULETIN FISIKA February Edition
Publisher : Departement of Physics Faculty of Mathematics and Natural Sciences, and Institute of Research and Community Services Udayana University, Kampus Bukit Jimbaran Badung Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/BF.2024.V25.i01.p08

Abstract

Salah satu teknik untuk meningkatkan stabilitas nanofiber komposit PVA/kitosan/kolagen (PChK) dalam air adalah dapat dilakukan melalui ikatan silang dengan glutaraldehid (GA). Berkaitan dengan hal tersebut, tujuan dari penelitian ini adalah untuk mengetahui pengaruh ikatan silang GA terhadap morfologi nanofiber komposit PChK. Nanofiber komposit yang digunakan adalah P8Ch2K2, P8Ch2K4, dan P8Ch2K8. Larutan yang digunakan dalam ikatan silang ini adalah larutan Aseton:GA:HCl dengan rasio 9:1:0,01 dan waktu reaksi ±4 jam. Karakterisasi nanofiber dilakukan dengan SEM dan dianalisis menggunakan ImageJ dan Origin. Diperoleh bahwa nanofiber ikat silang GA memiliki diameter serat rata-rata lebih besar yaitu dengan peningkatan rata-rata 7,54% dan panjang serat lebih kontinu yaitu dengan peningkatan panjang rata-rata 42,06%, dibandingkan dengan nanofibers tanpa ikat silang GA.
Co-Authors A. A. Ngurah Gunawan Adnyana, I Gusti Agung Putra Amalia Dwi Lestari Anak Agung Intan Rahmasari Arief Laksono Artawan, Made Dwi Bagus G. Dharmawan Dewa Ayu Sukma Pranastia Efrensiana Ana Melti Fahim Mamduh Feliatra Feriandanu Hakim G.A Putra Adnyana I Gde Antha Kasmawan I Gede Angga Rimawan I Gede Didi Jimbarwan I Kadek Agus Sara Sawita I Made Oka Guna Antara I Nengah Sandi I Nyoman Gede Putra Wibawa I Putu Dedy Pratama I Wayan Wisnawa Saputra I Wayan Wisnawa Saputra Ida Bagus Made Suryatika K N Suarbawa K N Suarbawa K. N Suarbawa K. P. Wibawa K.N. Suarbawa Komang Ngurah Suarbawa Kunthi, Mahendy Risnawati Laksono, Arief Made Dwi Artawan Made Padmika Mahayani, Ni Wayan Dewi Mahendy Risnawati Kunthi Maria Yulni Imas N. L. P. Sarasmitha Ni Luh Putu Anggreni Ni Luh Yuni Pramita Utami Ni Made Yuliantini Ni Nyoman Rupiasih Ni Nyoman, Ratini Ni Wayan Dewi Mahayani Ni Wayan Dewi Mahayani Nyoman Wendri Padmika, Made pandu lukito Poniman, S. Pt Widyatmika Putu Ayu Adi Susanti Ratih Wulandari Ria Yuliani Rimawan, I Gede Angga Rosvita Hilbrida Sulastri Saputra, I Wayan Wisnawa Satriya Wibawa, I Made Yuli Nurfadhillah