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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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Rancang bangun sistem pengaturan kelembaban tanah secara real time menggunakan mikrokontroler dan diakses di web Irwan Agus Saputro; Jatmiko Endro Suseno; Catur Edi Widodo
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

A research on telemetry or remote measurement, for the parameters of soil moisture and temperature of the object remains in the form of agricultural land. The measured parameters such as soil moisture values are obtained from soil moisture sensors. In addition added also parameter value air temperature obtained by measuring the air temperature. In order to measure the air suh used sensor DS18B20. Both of the devices are read and controlled by a microcontroller ATmega328 with the Arduino software. Recipients get the value of soil moisture humidity value from the sensor. Data such as soil moisture and temperature value of the air is sent to the microcontroller, then transmitted to the database server by using the Internet network GSM. The system will be automatically watering when the soil moisture values are below standard. The system is using web interface that allows users to monitor soil conditions without the need for special receiver station. The results of this study, the system can perform the measurement values of soil moisture and air temperature to the server and perform automatic watering. This reasearch used three medium, wherein each soil moisture rises up to 99% in the first and second medium, in the third medium soil moisture rises up to 97%. The increase in the value of soil moisture caused by the automatical watering is based on parameter moisture used.Keywords: Soil Moisture Sensor, Sensor DS18B20, telemetry by GSM internet, Arduino
PERBANDINGAN POST STACK TIME MIGRATION METODE FINITE DIFFERENCE DAN METODE KIRCHOFF DENGAN PARAMETER GAP DEKONVOLUSI DATA SEISMIK DARAT 2D LINE “SRDA” Sheyza Rery Dynza Anggary; Hernowo Danusaputro; Udi Harmoko
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

ABSTRACT           Analysis on Post Stack Time Migration (Post-STM) with finite difference method and Kirchoff method with determine gap parameter on deconvolution after stack had been applied to 2D land seismic at line “SRDA”. This research had purpose to applied seismic data processing to get subsurface imaging with high signal-to-noise ratio and analyze how the gap parameter corresponding on deconvolution after stack, and to determine which the appropriate method of migration between migration finite difference and Kirchoff migration in Post Stack Time Migration (Post-STM).         Gap parameter selected in the deconvolution process after the stack is a gap 24, 32 and 64. Based on the analysis of the three parameters were chosen gap 32 which has the best results because the gap 32 in accordance with the conditions of the data and the effect does not change the condition of reflectors on seismic cross section. While the migration phase, the results better structure when subjected Kirchoff migration method, because it is more obvious than the reflector continuity migration finite difference method. Keywords: Deconvolution after stack, Post Stack Time Migration
Rancang bangun furnace temperatur tinggi dengan pengendali mikrokontrol ATMEGA 8535 menggunakan sumber pemanas Silicon Carbide (SiC) Sulistyawan A; Anas M Najih; Priyono Priyono
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

It has been successfully designed high temperatur furnace using Silicon Carbide (SiC) as an electric furnace source which can be controlled by ATMEGA 8535. The result of thermocouple test with standard measuring device as calibrator in temperatur range 50 ° C - 500 ° C can work well, that have been indicated by the characteristics The temperatur in the thermocouple to the ADC (Analog to Digital Converter) value in the microcontroller is Y (ADC) = 2.0062 T + 4.6. In testing of the entire furnace system for various input voltages it can be shown that the higher operating voltage will increase the heating rate in the combustion chamber. In the design using 4 sources of heating SiC with the volume of combustion chamber 1.2 liters indicates the spread of heat is quite evenly and effectively.Keywords: Furnace, AVR ATMEGA 8535 Microcontroller, Silicon Carbide 
Rancang Bangun Audiometer Berbasis Mikrokontroler dengan Antarmuka Komputer Kartini Sinaga; Suryono Suryono; 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

For this research, an audiometer based on microcontroller with computer interface as a measuring instrument for the threshold of audible range has been designed. This device has some features, like graphic display, audio intensity display, and computer frequency. This audiometer intended for the research consists of frequency generator, audio generator, and manual and automatic amplifying switch. The microcontroller is the main component which has the ability to be frequency generator using Fast PWM at timer 1 within 16bit resolution and crystal value 16MHz so that the frequencies at 250 Hz, 500 Hz, 1000 Hz, 2000 Hz, 4000 Hz, and 8000 Hz can be generated precisely and steadily.The maximum audio intensity as the result of this research using the device was 46,2 dB. The result of the frequency test on the device designed for this research has the linear correlation coefficient R=1, meanwhile the audio intensity measured at the standardized device has the linear correlation coefficient R=0,997Keywords: microcontroller, sound level meter, multi-tester, frequency, audio intensity
Pengaruh ketebalan dan kombinasi jenis filter terhadap nilai Entrance Skin Exposure (ESE) menggunakan factor eksposi pemeriksaan kepala Salimatul Litasova; Eko Hidayanto; Muchammad Azam
Youngster Physics Journal Vol 7, No 2 (2018): Youngster Physics Journal April 2018
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Research on the analysis of the effect of filter type variation and thickness on mobile X-ray machine against ESE value of head examination. The use of filters aims to eliminate the low-energy X-ray beam so as to minimize the dose. The experiment was conducted to determine the ESE value and the thickness of the beak (HVL) on the combination of type and thickness of the filter. Combination filter used was aluminum (Al) with copper (Cu), aluminum with zinc (Zn), aluminum with galvalum (AlZnSi), aluminum (Al)), copper (Cu) with galvalum (AlZnSi), copper (Cu) with zinc (Zn), stainless steel (SS) with galvalum (AlZnSi) and stainless steel (SS) with zinc (Zn) ). With variation of 70, 81 and 90 kV fixed-time line voltages 20 mAs, 100 cm SSD, and 10 x 10 cm irradiation field measured tube voltage and ESE with combination of type and thickness of the filter. The results showed that ESE value with head examination exposure factor using combination of 1-1,5 mm filter Al with Zn, and combination of 1.5 mm  filter Al with galvalum was at tolerance 0,348 - 0,522 mGy. While the exposure factor with combination of filter, Cu with Zn, Cu with galvalum, Cu with Al, SS with Al, SS with Zn and SS with galvalum with thickness of filter combination 1-2 mm under tolerance limit. So that can be used alternative materials other than filter Al can use combination of  filter SS with AlZnSi. Half-Value Layer (HVL) exposure factor 90 kV with an filter Al with galvalum, we can use a 0.52 mm filter on a 0.71 mm filter Al with Zn. Keywords: x-ray machine, ESE, filter, HVL
INTERPRETASI STRUKTUR BAWAH PERMUKAAN DAERAH MANIFESTASI PANASBUMI GEDONG SONGO GUNUNG UNGARAN MENGGUNAKAN METODE MAGNETIK Harri Yudianto; Agus Setyawan
Youngster Physics Journal Vol 3, No 1 (2014): Youngster Physics Journal Januari 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Interpretation of subsurface structure has done in Gedong Songo geothermal manifestation of Ungaran volcano using magnetic method. Interpretation of subsurface structure showed in two dimensions. The quantitative interpretation result show that, Gedong Songo is compose of 4 main layers. The first layer is sedimentary which consists of breccia, sandstone, pyroclastic deposits, alluvium, and top soil, it have a susceptibility value about 7.0x10-5 cgs emu, the second layer is an alteration of andesite lava, it has a susceptibility value about -1.0x10-2 cgs emu. Third layer is composed of hornblende-augite andesite, it has a susceptibility value about 1.34x10‑2 cgs emu, and the fourth layer is composed of andesite rock, it has susceptibility value about 1.35x10-2 cgs emu. Keywords : Magnetic, susceptibility, geothermal, Gedong Songo
IDENTIFIKASI JENIS JERAWAT DENGAN WAVELET HAAR DAN JARINGAN SYARAF TIRUAN PROPAGASI BALIK Nava Muzdalifah; Kusworo Adi
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

Acne is one of the most common diseases that often occur in adolescence. Acne is caused by several factors, namely genetic, hormonal, stress, Propionibacterium acnes microorganisms, environmental, and cosmetics. The existence of these factors can cause many types of acne, such as blackheads, whiteheads, papules, pustules, and nodules. Various efforts that have been done to resolve the problem of identifying the types of acne still has some flaws that required identification system type of acne that is cheap, effective, efficient, and accurate. Innovation identification of the type of acne is designed with the help of digital microscope camera, and a computer model in which applications are developed is based on wavelet transform and neural networks to identify types of acne automatically. Results of a system can identify the type of acne automatically using wavelet transform with the decomposition at level 3 and the coefficients is horizontal and backpropagation neural network with a network architecture that consists of various layers are input layer, hidden layer and output layer. Accuracy of identification the system is 84,6% with instructional time by 8 seconds. Identified the type of acnes are blackheads, cysts, nodules, papules, pustules and whiteheads. The range accuracy for acnes identification on the network is 72% until 92%. The best pixel resolution is 8 MP.
PENGARUH PERUBAHAN FAKTOR EKSPOSI TERHADAP NILAI CT NUMBER Tina Melinda; Eko Hidayanto; Zaenal Arifin
Youngster Physics Journal Vol 3, No 3 (2014): Youngster Physics Journal Juli 2014
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

CT Number valuehad been conducted with various of exposurefactoronCT. Testingwas conducted to test the CTNumber value changeswith varioues of exposure factorsthencompare it withthe recommendedtolerance. Testing was doneby usingsome objectthere arewater phantom, plasticwaterphantom, chickenblood, chicken (breast part) andchickenbone(thigh). Performedwithtwoscanning, axialandhelicalscanning methods. Various of exposurefactors used the voltage 80 kVp to 140kVp, current100 mA  to 180mAandexposure time0.6 second to 2second. Collimatorwith alargeselection and slice thickness 5mm.            From the test resultshave known thatchangesof the exposurefactorswill affectedCTNumber value. CT Number value obtain from the test results by using water phantom -2,50 HU until -4,99 HU, plastic water phantom -6,99 HU until +6,99 HU, blood +31,01 HU until +36,70 HU, chiken (soft tissue) +48,33 HU until +66,61 HU and bone +800,15 HU until +1188,28 HU.Thevalue is stillwell withinthe recommendedtolerancesareforwater phantom andplasticwaterphantom0±7HU, blood+30 HU to+45HU, soft tissue+37 HUto+300 HU andbone+700HUto+3000 HU.Keywords: CTNumber, exposure factors, plasticwaterphantom, axial scanning andhelicalscanning
PEMODELAN 2D SEBARAN TAHANAN JENIS TERHADAP KEDALAMAN DAERAH PANASBUMI GARUT BAGIAN SELATAN MENGGUNAKAN METODE MAGNETOTELLURIK Dita Destyanti; Tony Yulianto; Eddy Z Gaffar
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

Southern Garut geothermal area West Java, is one of the area with geothermal prospects, characterized by the surface manifestations of craters in Papandayan mountain region and hot springs in Ciarinem area. The area was composed by old volcanic rocks, generally consists of a tuff rocks, tuff breccias and lava. This study aims to interpret 2D modeling of resistivity distribution to the depth of Garut Southern area geothermal and to determine geothermal system of that area under magnetotelluric method (MT). This method is used because its capablility to detect subsurface structure to a thousand meters depth. The data was taken as much as 32 acquisition points. The Data was obtained from field acquisition process, further processed using SSMT 2000 MT Editor 90, and WinGLink software. The results showed the presence of two geothermal systems in Ciarinem and Papandayan mountain region, consist of clay cap rocks, reservoir rocks, and hot rock. Clay cap rocks wich tend conductive located at shallow depths with resistivity value ranging from 10 – 30 ohm.m, reservoir rocks with resistivity value of between 40 – 600 ohm.m and hot rocks that are more resistive have resistivity value ≥700 ohm.m.
PERBANDINGAN PENGUKURAN PDD DAN BEAM PROFILE ANTARA DETEKTOR IONISASI CHAMBER DAN GAFCHROMIC FILM PADA LAPANGAN 10 X 10 CM2 Hamzah Fuadi; 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

The Comparison of PDD and beam profile measurements between detectors Ionization Chamber and Gafchromic film on 10x10 cm2 field. has been done Measurements were made with the detector CC-13s with a volume of 0.13 cc as a reference detector. Measurements were performed using IBA RFA phantom dosimeter. while the film measurement using solid water phantom gafchromic done. Measurements were taken at a field size of 10x10 cm2 in plane 6 MV linac with energy. Profile measurements performed using the SAD technique, with a depth of 10 cm for 6 MV. While the PDD measurements using SSD technique. From the results of this study are expected to know the PDD curve Beam profile and optimal dose measurement accuracy can be achieved in clinical treatment. well as the advantages and disadvantages of each detector and can be taken into consideration in selecting the optimal dosimeter according to the function that will be used.  Key words: Small field dosimetry, ionization chamber, gafchromic film

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