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INDONESIA
YOUNGSTER PHYSICS JOURNAL
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
Arjuna Subject : -
Articles 282 Documents
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Pembuatan sistem ozonizer untuk degradasi pewarna rhodamine B dengan metode peroxone menggunakan mikrokontroler ATMEGA 8535 Rin Hafsahtul Asiah; Jatmiko Endro Suseno; Zaenul Muhlisin
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

The decrease of the quality water is caused by the dye waste of rhodamine B that found in liquid waste. One of the ways to treat that liquid waste is using the peroxone process that combines ozone (O3) and hydrogen peroxide (H2O2). The production of ozonizer system is vital due to its effectivity. The system is made by adding the microcontroller of Atmega 8535 as a timing controller that can adjust the duration of ozonizer system work. In addition, the concentration of H2O2 and the optimization of ozonation process were done to produce the most optimal degradation. The optimal ozone generator works on the frequency of 3500 Hz while the power is 2.15 Watt, 3576 V of voltage, and 0.6 mA of current with the average ozone production reaching 266 ppm every 30 minutes. The greater concentration of H2O2 that used and the longer ozonation time will increase the percentage degradation of rhodamine B. The greatest degradation percentage was achieved at the H2O2 concentration of 2500 ppm. The rhodamine B of 20 ppm was successfully degraded with the highest degradation percentage reaching 97% for 150 minutes.Keywords: Rhodamine B, Peroxone, Mikrokontroller
REDUKSI LONG PERIOD MULTIPLE DENGAN MENGGUNAKAN METODE HIGH-RESOLUTION RADON DEMULTIPLE (RAMUR) PADA DATA SEISMIK DARAT 2D Faradina A. P.; Udi Harmoko; Fazrin Oktafian
Youngster Physics Journal Vol 4, No 4 (2015): Youngster Physics Journal Oktober 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Multiples often occur in marine seismic data, but actually, they also occur in the far offset section of land seismic in that multiple reduction in land seismic data using CDP gather resulted from conventional method can be applied to acquire omitted multiple model. There are many methods to reduce the appearance of long period multiples, yet to remove multiples from primary signals is challenging. Compared to other methods, high-resolution Radon demultiple (RAMUR) is a method which uses Radon transform to predict multiples using domain tau-p to model multiples. RAMUR processing has more advantages in identifying reflection events, both in primary signals and multiples, to produce good stack sections. In this research, CDP gather resulted from conventional method was used as input in multiple modeling. Besides, adaptive subtraction process also apply CDP gather as input data to be subtracted with multiple model to preserve the data. The result shows that high-resolution Radon demultiple (RAMUR) method is able to reduce long period multiples in far offset section using DTCUT 120 parameter in land seismic effectively.
IDENTIFIKASI BIDANG GELINCIR PEMICU TANAH LONGSOR DENGAN METODE RESISTIVITAS 2 DIMENSI DI DESA TRANGKIL SEJAHTERA KECAMATAN GUNUNGPATI SEMARANG Arga Brahmantyo; Tony Yulianto
Youngster Physics Journal Vol 3, No 2 (2014): Youngster Physics Journal April 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Landslides was happened by landslide surface. Landslides Identification of landslide surface using dipole-dipole array geoeletrical  resistivity 2D method has been conducted at Trangkil Sejahtera Sukorejo Village Gunungpati Regency Semarang. Interpretation of subsurface structure showed in 2D.            Field data has processed using RES2DINV program which gives stones resistivity distribution and depth of layers as a result. The result of RES2DINV is entered to CorelDraw to obtain 3D section. Landslide surface has detected by CorelDraw  result’s.            The interpretation show that at Perumahan Trangkil Sejahtera lithology consist of four layers i.e. sandstone, clay/lanau, wet clay, and topsoil. Slip surface was located on lanau/wet clay layers with resistivity 0,492-9,11 Ωm and dept of layers 2,65-6,47 m. Type landslides research area is kind of translational and rotational slides.Key words : Geoeletrical resistivity 2D, landslide surface, Trangkil Sejahtera, dipole-dipole, RESD2INV
RANCANG BANGUN SISTEM MONITORING KONDUKTIVITAS LISTRIK AIR MENGGUNAKAN WIRELESS SESNOR SYSTEM (WSS) Margo Utomo; Suryono Suryono
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

Water has many benefits one of which is a good conductor of electricity, because the water contains ions that can conduct electricity, the amount of water's ability to conduct electricity known as electrical conductivity or electrical conductivity (EC). The electrical conductivity of the water is in practice often used as parameters of water quality. Therefore the need for a monitoring electrical conductivity of water so that the levels of electrical conductivity in a body of water. The method used for water monitoring system for electrical conductivity using Wireless Sensor System (WSS). By using WSS data monitoring can be done at a distance, direct or realtime network using Wi-Fi. To know the symptoms of the changes that occur in the water sensor uses electrical conductivity of water. Values that comes out of analog value which is then converted into digital values by microcontroller ATSAM3X8E with features Analog to Digital Converter (ADC), then the data is sent to a computer using serial communication. The data sent is stored in a database at the station Remote Terminal Unit (RTU). The data has been stored subsequently sent to the Terminal Station Control Unit (CTU) using Wi-Fi networks. Data sent to CTU station can be accessed by accessing the IP address in a web browser. The results of the characterization of the sensor to a standard measuring instrument obtained the following equation y = 58,666x - 42929. Furthermore, the equation to be incorporated into the program the microcontroller then do the calibration. The results of the calibration of linear correlation coefficient (R) and standard deviation (δ), a conductivity sensor has R = 0.999 and δ = 129.76 μS / cm. Of data sent and received data error does not occur, so it can be ascertained that the data transmission no data is wrong, less, or increases. 
PENGUKURAN TINGKAT RADIOAKTIVITAS 210Pb DAN 40K PADA TEMBAKAU ROKOK SERTA ESTIMASI DOSIS EFEKTIF YANG DITERIMA DARI MEROKOK Achmad Chalid Afif; Eko Hidayanto; Zaenal Arifin; Poppy Intan Tjahaja; Putu Sukmabuana
Youngster Physics Journal Vol 3, No 4 (2014): Youngster Physics Journal Oktober 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The radioactivity in tobacco leaves assessment collected from 14 popular brand in Indonesia. Cigarette was studied in order to find activity concentration of 210Pb and 40K in a cigarette sample, and the effective dose induced to smokers from cigarette tobacco due to the naturally occurring radionuclides, such as 210Pb and 40K. It was concluded that the activity consentration of radioisotope 210Pb varied from 2,22 Bq/kgto 5,56 Bq/kg with average 3,968 ± 1.042 Bq/kg, 210Pb originated from the air and was deposited onto the tobacco leaves and trapped by trichomes, while for 40K from 8,89 Bq/kgto 15,56Bq/kg with average11,75 ± 1,782 Bq/kg.40K in the tobacco leaves was due to root uptake either from soil or fertilizer. The annual effective dose do to inhalation for adults smokers for 210Pb from 16,47 µSv/year to 41,18 µSv/year with average 29,42 ± 7,772 µSv/year. This dose must be compared with the average worldwide exposure to natural radiation source 2,4 mSv/year and especially the part due to inhalation which is 1,26 mSv/year.Keywords: Radioactivity, tobacco leaves, effective dose, smoking
Desain dan implementasi pengukuran parameter lingkungan dengan Raspberry Pi sebagai node Agvion Virsaw; Isnain Gunadi; Kusworo Adi
Youngster Physics Journal Vol 6, No 1 (2017): Youngster Physics Journal Januari 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Environment is a system that greatly affects the growth and development of organisms. In this earthly life, the environmental factors such as temperature, humidity and light intensity is an element which greatly affect humans, animals and plants to be able to adapt to its environment. Pollutants in the environment will be different in a place where others because of their conditions of temperature, humidity and lighting that will bring great influence in the spread of pollution, both in the local scale (the environment) or regional scale (environmental and vicinity). The effects of air pollution is the result of adverse impact on the environment, human health, and many living things on earth. Air pollution is a disorder that most complaints by the people. By making measurements of environmental parameters monitoring tool with LDR sensor for measuring changes in light, and DHT11 to measure changes in temperature and humidity that will be processed by the Raspberry Pi which is then displayed on a 16x2 LCD interface and stored in the database. Expected to monitor environmental parameters in real time. Some of the variables resulting from the environmental parameter measurement system with Raspberry Pi as a node such as temperature, humidity, and light intensity in the environment. The results of the data obtained by the sensor readings performed by the Raspberry Pi has a fairly good accuracy of ±  C for temperature, ± 5% RH for humidity, and ± 4,3 Lux intensity. The result shows that the system is running well. Keyword : LDR Sensor, DHT11, LCD 16x2, Raspberry Pi, Database
ANALISA PENGARUH OZONISASI HASIL LUCUTAN PLASMA BERPENGHALANG DIELEKTRIK PADA BERAS TERHADAP PERUBAHAN AMILOGRAFI, KEKERASAN, DAN WARNA Saifur Rijal; Muhammad Nur
Youngster Physics Journal Vol 4, No 1 (2015): Youngster Physics Journal Januari 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The research on application of Dielectric Barrier Discharge Plasma with spiral-cylindrical configuration to produce ozone has been done. The purpose of this study was to determine the effect of ozone on the physical characteristics of rice which include discoloration, hardness, and the value of amilograph.Ozone reactor that used in this research have a spiral electrode made of wire, and dielectric material was pyrex tube. Plasma discharge was generated by AC high voltage up to 9 kV. Air flow rate used as a determinant of ozone concentration characteristic was 6 liters/min, while for treatment the air flow rate that used was 4 liters/min in order to obtain the ozone concentration of 10 ppm. Ozone is produced by inserting the free air into the reactor. Ozone concentration is determined by varying the voltage, while ozone generated is detected by ozone meter.The results showed that that the effect of ozonation to physical character of rice was not give significant changes and has a tendency to increase the quality of rice. It can be concluded that ozonation is safe for use in rice storage system. Keywords: Dielectric Barrier Discharge, spiral-cylindrical (SC), ozone, discoloration, hardness, value of amilograph.
Pengukuran jarak objek pejalan kaki terhadap kamera menggunakan kamera stereo terkalibrasi dengan segmentasi objek histogram of oriented gradient Tutur Urip; Kusworo Adi; Catur Edi Widodo
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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Abstract

The distance measurement of pedestrian object to camera using a calibrated stereo camera has been investigated. The study was conducted by comparing Data-A and Data-B with different conditions and environment data interpretation. The stereo vision methods include camera calibration, image rectification, disparity counting, three-dimensional reconstruction and object segmentation. The object segmentation is performed using the Histogram of Oriented Gradient  feature to segment pedestrian object. Meanwhile, to determine the distance value is based on the information of the centroid of the bounding box segmented object.The calculations were performed using the Euclidian Distance calculation method to find the shortest distance between the centroid of the bounding box with both cameras. From the research results, the best accuracy was obtained  with measurement error of 4%. Keywords: Measurement object, pedestrian, calibrated stereo camera, Histogram of Oriented Gradient, Euclidian Distance.
PENGGUNAAN METODE GEOLISTRIK RESISTIVITAS 3-DIMENSI UNTUK MENGETAHUI SEBARAN LIMBAH DI TPA JATIBARANG KOTA SEMARANG Aspia Prapitari; Tony Yulianto
Youngster Physics Journal Vol 2, No 3 (2013): Youngster Physics Journal Juli 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The waste distribution in TPA of Jatibarang in Semarang has measured and interpreted using resistivity geoelectric 3-D method with pole – pole configuration.Field data has processed using Res3dinv program which gives horizontal and vertical cross section as the result. The result of res3dinv is entered to RockWork software to obtain 3-D cross section. The result of RockWork software could describe the waste distribution in TPA of Jatibarang.The research result shows that the direction of waste distribution in TPA of Jatibarang which has resistivity range 21,5 Ωm – 39,2 Ωm is to East – South which is to Kreo river. Key words : Resistivity geoelectric 3-D, Garbage dump waste, Pole – pole configuration, Res3dinv, RockWork 
Analisis kurva isodosis paparan radiasi pada ruang terapi dengan Linear Accelerator (LINAC) 6MV Ana Aprilia; Eko Hidayanto; Evi Setiawati; Sanggam Ramantisan
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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Abstract

Radiation exposure in the therapy room with linac 6 MV devices has been conducted at Ken Saras hospital. The purpose of this research was to determine the radiation exposure in the therapy room to provide the information for radiation workers regarding the safe location in therapy room using isodose curve presentation and contour mapping of radiation exposure in the therapy room. The results of radiation exposure measurement were then used to calculate the radiation dose received by patients during therapy as patient information. The method used in this research was the direct measurement of radiation exposure in therapy room using survey meter with 130 cm height from the floor at some point with the addition of each 1 meter, field size is 40 cm x 40 cm, absorbed dose is 50 MU and variations of the gantry position, gantry 00, gantry 900 and gantry 2700.  The result of the measurement then used to create a contour using a software and then analysed to point the safe location through a mathematical calculation. The Values of radiation exposure in field size of 40 cm x 40 cm then converted to the value of radiation exposure in field size of 10 cm x 10 cm on a sample study case patient X by multiplying with the value of the inverse square. The converted value is then calculated into the radiation dose received by patients X during therapy. The results showed that the gantry 00 and gantry 2700 position, the safe location in therapy room for radiation worker is at the position (-5.5; -4) with a dose rate of 7.2 μSv / h and 9.6 μSv /h while at gantry 900  position  there is no safe area for radiation workers in the therapy room. The value of exposure radiation that received by the patient X in this research, that undergo once therapy with 4 times exposure at 4 variation gantry position at dose of 50 MU with  10 cm x 10 cm field size is 1196.9502 μSv or 1.197 mSv. Keywords:  radiation exposure, therapy rooms, isodose curve, safe area, patient radiation dose

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