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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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ANALISA PENGARUH GRID RASIO DAN FAKTOR EKSPOSI TERHADAP GAMBARAN RADIOGRAFI PHANTOM THORAX Aulia Narindra Mukhtar; Heri Sutanto
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

Analysis of the influence of the grid has been determined and the ratio of the radiographic expose factor thorax phantom with grid ratio and expose factor variation to analyze the density and contrast on chest radiographs. Research methods using phantom anthoropomorphic, densitometer and X-ray equipments. Irradiation conditions are given with some expose factor variation is 55 kV 16 mAs, 65 kV 8 mAs, 75 kV 3.2 mAs, and a variety of grid ratio 6:1 and 8:1. Research data is processed and made in the form of a graph of the density of the contrast of the grid ratio and expose factor variation. The higher the ratio of the grid will cause a decrease in the density of radiographs, but does not always lead to increasing or decreasing the contrast radiographs. Results overview on to 5 thorax phantom organ that produces the highest optical density in the use of expose factors 65 kV, 8 mAs on both the grid ratio.Keywords: Grid ratio, expose factor, radiographs
Monitoring perubahan massa area lumpur LAPINDO dengan metode gayaberat antar waktu: Stusi kasus Porong Jawa Timur Indah Asmoro Wulan; Agus Setyawan
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

Sidoarjo mud occurs because of the emergence of hot mud and mudflow. Microgravity method used to monitor the mud, indicate that height change and know subsurface structure. Microgravity analysis based on microgravity data used to find out the value of microgravity changes. The result of microgravity value change indicate that the positive value is the addition of subsurface mass and land subsidence while the negative value is the reduction of subsurface mass. Three dimensional modeling based on gravity data were performed to find out the subsurface structure in the study area. The complete Bouguer anomaly is separated using an upward continuation to obtain regional and residual anomalies. 3D modeling were performed on complete Bouguer anomalies. 3D modeling results indicate of sedimentary rocks, sand, gravel, clay and indicate.Keywords: land subsidence, mudflow, microgravity method, 3D modelling
OTOMASI SISTEM DESTILASI MENGGUNAKAN PLC OMRON CP1H DAN KONTROL SUHU DENGAN KENDALI AUTO TUNING PID DALAM PENAMPIL SCADA Tito Rano Pradibto; Kusworo Adi
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

Industrial world today can't be separated with the problem of automation for various production facilities, one of them is the process of distillation in industry or the oil refining industry. Distillation is the process of separating substance by boiling point, where the temperature becomes the focal point of the phase that change process so it to control of substances that aims to keep the temperature value in the range of desired values. In this study using a multilevel distillation system, so it has two set of controling temperature points. Operation of distillation system automatically works with the help of controls Service such as PLC OMRON CP1H and temperature control with auto tuning PID (Proportional Integral Derivative). The system is equipped with SCADA (Supervisory Control and Data Acquisition) and data logger so as to facilitate the operation of automation and configuration PID parameters such as proportional coefficient (Kp), the integral time (Ti), the time derivative (Td). Modeling materials processed using methanol with 64 oC boiling point and ethanol with a boiling point of 78 °C. Results of the research showed us that the temperature control system can use the auto tuning PID controled by a PLC can be done, a good temperature control is obtained with a small error rate. auto tuning method is still having oscillations, but a PID value will be automatically calculated quickly so that a constant parameter values obtained to get the stability of temperature. The value of maximum overshoot (Mp) of auto tuning of 9,09% and error steady state (ESS) of 1.53%. Results of calculation from the value of parameter auto tuning PID used as next tuning parameters and steady state response is obtained more quickly, with Mp of 4,61% and 0% of ESS.
INTERPRETASI LAPISAN BAWAH PERMUKAAN DI AREA PANAS BUMI GUNUNG TELOMOYO, KABUPATEN SEMARANG MENGGUNAKAN METODE GEOLISTRIK RESISTIVITY KONFIGURASI SCHLUMBERGER Elida Septiana Putriutami; Udi Harmoko; Sugeng Widada
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

Geoelectric measurements and interpretation have been conducted to obtain subsurface structure information in Geothermal area of Telomoyo Mountain at Semarang regency using Schlumberger configurationWe obtain a potential difference and current from field data acquisition that can be used to calculate the apparent resistivity value. Then, the apparent resistivity value is processed using IPI2win program to determine the value of resistivity in each layer using geological information as validation. The geoelectric results showed the presence of fault structures such as normal faults down and the layers which has resistivity values at 116 Wm with a depth at 106 - 120 m from the surface of geoelectric line are interpreted as the upper boundaries of the Caprock layer. Keywords: Resistivity, Schlumberger, Geothermal, Telomoyo Mountain
RANCANG BANGUN SISTEMMONITORING KADAR SALINITAS AIR MENGGUNAKAN WIRELESS SENSOR SYSTEMS (WSS) Febriana Tirta Kirana; 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

Real time monitoring in designated location using remote observation has become one topic chosen to be efficiently developed because it can be observed and anticipated earlier when the water quality is decreasing. One of the indicators of water quality is salinity, which is being developed through this study by using remote measurement system (telemetry) using Wi-Fi network. To determine the change of the indicator, a salinity sensor was used to determine the level of salinity. The sensors were mounted on a Remote Terminal Unit (RTU) attach on the object being observed. Those sensors produced analog signal so the signal should be converted into digital signal using Analog to Digital Converter (ADC) on ATSAM3X8E microcontroller. The digital data were then sent using serial communication from microcontroller to computer. The data were saved in the database and sent to Control Terminal Unit (CTU) using Wi-Fi network. A characterization was then conducted to a series of sensors produced from the previous phase using standard equipment to ADC value and a formula of sensor characteristic to ADC value was calculated which results in salinity equation value on y = 0,049 x – 35,306. The formula was then used in microcontroller program which results in coefficient of correlation on salinity sensor as R = 0,993 with 0,025 ppt error. From the test on communication system between database in Remote Terminal Unit (RTU) and Control Terminal Unit (CTU), there is no additional and missing data from data sent and data received, so it can be concluded that there is no error.
PENGARUH BEBERAPA JENIS ELEKTRODA UNTUK MENENTUKAN PERPINDAHAN CESIUM-134 di DALAM TANAH MENGGUNAKAN METODE ELEKTROKINETIK Agus Joko Prasetyo; Eko Hidayanto; Zaenal Arifin
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

Require to be conducted by impure soil remidiasi to shuting-out of Cesium-134 into human being body with elekrokinetik for the purpose of determining transfer of Cesium-134 and influence of electrode type in soil. This research used by three electrode type that is copper, stainless steel, and graphite. Transfer of Cesium-134 contamination divide by three areas there are zone I (0-7,5 cm from anoda), zone II (7,5-22,5 cm from anode) and zona III (22,5-30 cm from anode). From result of transfer of Cesium-134 comntamination and transfer efficiency got one of the electrode type which the best to be used for the sweeping of Cesium-134 contamination. Result transfer of contamination Cesium-134 using three different electrode type have transfer which much the same to that is zone I  degradation of concentration, zone II unstable concentration and zone III increase of concentration. For the degradation of copper electrode type electrics current 20.80 mA, steel stainless 23.00 mA, and graphite 15,00 mA. While best electrode type this research is graphite with efficiency at zone III equal to 4,48%, 7,43%, and 9,09%. Keywords: Elektrokinetik, Cesium-134, copper, steel stainless, and graphite.
Laju paparan dan dosis radiasi dari pasien terapi kelainan kelenjar tiroid dengan pemberian radiofarmaka Iodium-131 Ahmad Mutohar; Wahyu Setiabudi; Rini Shintawati
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

Research about exposure and dose rate from patients with thyroid gland disorders therapy who received radiopharmaceutical Iodine-131 is done by direct measurement using a survey meter. In this study, the exposure rate collected from 37 patients who received doses of radiopharmaceutical therapy with activity ≤ 30 mCi and 13 patients who received doses of radiopharmaceutical therapy with activity> 30 mCi. Exposure rate of each patient was subsequently changed in the form of the dose rate. The results obtained that all patients who received a dose of a radiopharmaceutical with activity ≤ 30 mCi, produce dose rate below the maximum extent permitted to leave the hospital.  While patients who received doses with activity > 30 mCi, produce a dose rate above generate maximum extent permitted to leave the hospital. Besides that, the research also analyzed the reduction of dose rate from each patient. A decrease of dose rate (within 1 hour after administration of radiopharmaceutical) is affected by the excretion rate and rate of uptake of iodine in the blood.  Specially, patient who received a dose with activity > 30 mCi, efective half-life value is determined from a decrease of the dose rate each patient. The results obtained that effective half-life of I-131 in the body of every patient in the range of 6 to 14 hours. Patient H had the shortest effective half-life and patient M has longest effective half-life. The difference of effective half-life of I-131 affected by  biological elimination/ biological half-life of each patients.Keywords: Exposure rate, dose rate, Iodine-13 therapy patients, effective half-life
EVALUASI MODEL JARINGAN SYARAF TIRUAN METODE BACKPROPAGATION UNTUK PREDIKSI IKLIM EKSTRIM DENGAN KORELASI CURAH HUJAN DAN TINGGI MUKA LAUT DI SEMARANG Siti Yuniar Pangestu; Rahmat Gernowo
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

Global warming is an event average temperature rise of the atmosphere, ocean, and land. Atmosphere temperature changes cause the physical conditions of the atmosphere becomes unstable, causing anomalies weather parameters that cause climate change. The impact of climate changes is increasing frequency of natural disasters or extreme weather, changes in rainfall patterns, and rising sea level rise. To minimize disaster prediction is carried out by making modeling with artificial neural network method, algorithm of backpropagation models.The research was conducted in Semarang, using data from rainfall, precipitation, temperature, cloud cover, and sea level rise in 2002 until 2012.Artificial neural network modeling was used Matlab R2010a. Network training by using one unit of input layer, two hidden layer units, and one unit of output layer. The first hidden layer with 10 neurons and the second hidden layer used 5 neurons.The best results on the training and testing of the network by using the parameter learning rate 0.3 and a momentum 0.6. The results obtained in the training get a percentage value of correlation is 79.0% and in the testing process to get the percentage correlation is 77.5%. Keywords: Artifical Neural Network, Backpropagation, extreme climate, rainfall, sea level rise
Pendeteksi kelelahan mata pengemudi kendaraan menggunakan metode segmentasi warna dalam ruang warna YCBCR Salsabila Naqiyah; 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 progress and technology in development of transportation is increasing. However, this is also accompanied by the emergence of some undesirable negative effects such as increased number of traffic accidents. The increase in number of accidents is usually caused by various factors including human factors, vehicle factors, and environmental factors. The human factor is one of the most frequent factors causing traffic accidents. This system is designed as the manufacture of detection software for detect the condition of eyestrain in the driver of the vehicle using a camera connected to the computer as an image input device and measured performance of system develeopment. The method used in this system is to detect faces with segmentation RGB color to YCBCR color, eye detect with Roberts edge and the last method of simple logic as a classification of eye conditions. The system shows the results of classification with the highest accuracy is on video 1 of 85.40% and the lowest accuracy in video 7 is 13.67% whereas, the highest accuracy warning results on video 5 with 94.4% and the least accurate accuracy of warning with 25.26%.Keywords: YCBCR color space segmentation, eye fatigue, eye classification system
SIFAT OPTIS LAPISAN ZnO:Ag YANG DIDEPOSISI DI ATAS SUBSTRAT KACA MENGGUNAKAN METODE CHEMICAL SOLUTION DEPOSITION (CSD) DAN APLIKASINYA PADA DEGRADASI ZAT WARNA METHYLENE BLUE Dilla Sistesya; Heri Sutanto
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

ABSTRACTIn this research, ZnO:Ag thin films have been successfully deposited on glass substrates by spray coating technique with a variety of the doped of percent Ag about 2%, 3%, 4% dan 5%.. Optical properties ZnO:Ag thin films were characterized by using UV-Vis spectroscopy. Methylene blue as degradation media was used to estimate the photocatalytic activity from deposition samples ZnO:Ag . The research showed that silver doped in ZnO can enhance photocatalytic actifity because inhibite the recombination rate. In addition, higher concentration of ion doped, lower band gap energy making electron easily excitate. The result photocatalityc activity of ZnO:Ag able to degrade Methylene blue until 91,37%Keywords: Photocatalyst, Spray coating, ZnO:Ag, Band gap energy, Methylene blue.

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