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INDONESIA
YOUNGSTER PHYSICS JOURNAL
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Physics
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Articles 282 Documents
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STUDI POLARISASI FLUORESENSI MENGGUNAKAN SAMPEL MINYAK SAWIT Aziel Nimrod Febriyanto; Ketut Sofjan Firdausi
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

This study was conducted to compare the changes in fluorescence polarization angle for fresh cooking palm oil, expired or used cooking oils with electrooptic method. The samples are one brands with a variety of palm cooking oil expired, two fresh palm cooking oil samples and two samples of used cooking oil. Used a green laser with a wavelength of 532 nm as light source. The results showed that most small changes in polarization angle experienced by the samples of fresh oil then becomes greater for expired and used cooking oil samples. The biggest polarization angle changes occur in used cooking oils and oil expired that shows the low quality of the sample. The results showed that the polarization by fluorescence is possible to be used as a complementary test oil quality parameter.
EVALUASI METODE PERHITUNGAN KETEBALAN PERISAI PADA RUANG DIGITAL RADIOGRAFI Wulandhari Wulandhari; Wahyu Setia Budi; Agung Dwiyanto
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

This research would discuss about the methods to determine shielding thickness for X-Ray of digital radiography room published by BIR (British Institute of Radiology), NCRP (National Council on Radiation Protection), KEMENKES No.1014/Menkes/SK/XI/2008 and Perka BAPETEN No. 4 (2013). Each method assume different considerations so evaluation is needed in terms of it’s ability to control external radiation exposure.                Shielding thickness based on NCRP and BIR need data such as space map area of the other side operation X-Ray, shift workers, total number of patient, and distance of primary and secondary radiation to the point of occupation, all of data collected based on survey before experiment. Then shielding thickness calculated  based on the dose rate inside and outside room be used as a comparation.                 The result  of primary Pb shielding thickness by NCRP 49 is 1,00  mm, NCRP 147 is 0,469 mm and BIR is amount of 0,650 mm. The secondary Pb thickness shielding by NCRP 49 is 0,500 mm, NCRP 147 is 0,170 mm and BIR is amount of 0,00980 mm. Shielding thickenss based on dose rate, for primary Pb shielding thickness is  0,898 mm and secondary Pb shielding thickness is 0,987 mm respectivelly. The result of shielding thickness based on NCRP 49 method is closer with the result by shielding thickness was based on dose rate. Keywords: NCRP 49, NCRP 147, BIR, Shielding Thickness, Dose Rate.
Wireless sensor system untuk pengukuran daya listrik panel surya Yurixa Sakhinatul Putri; Suryono Suryono; Jatmiko Endro Suseno
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

In this research, wireless sensor system is used to electrical power of solar cell measurement with wirelessly through of WiFi as data transmision. This system is required to monitoring and measuring electrical power of solar cell with long distance. This system also very helpful personil to do measurement because could be solving a problem in personnel limitations and instrument limitations. So, wireless sensor system become a solution in measurement. The system is made from voltage sensor circuit and current sensor circuit. Sensors are connected to ADC ATSAM3X8E microcontroller. Microcontroller reads voltage and current values by converting the analog scale to digital for sent to computer. Then, the data was saved in database and was sent to central station. Data has sent wirelessly by WiFi which is could be shown via web browser on computer. The result of calibration voltage sensors has correlation 0.9885 to standard gauge and average error 0.013 volts. The result of calibration current sensor has correlation 0.9881 to standard gauge and average error 0.012 ampere. The result of comparison beetween data which is sent from the field and received data has 0% error. So, it could be say that there is no placement data error.Keywords: Wireless Sensor System, Electrical Power, Solar Cell, Measurement, WiFi 
STUDI KARAKTERISTIK KELISTRIKAN KOMPOSIT CARBON NANOTUBE-POLYVYNILIDENE-FLOURIDE (CNT-PVDF) Maulidanir Rohman; Agus Subagio
Youngster Physics Journal Vol 2, No 2 (2013): Youngster Physics Journal April 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Development of nanomaterial technology strongly supports advancements in composite technology. Composite that use nanomaterial produce better electrical properties than common composite. Carbon nanotubes (CNT) is one of nanomaterial with high conductivity, so it’s potentially used in composite for various aplication. This research combines Carbon Nanotubes (CNT) with Polyvynilidene Flouride (PVDF) for producing CNT-PVDF composite with high conductivity. CNT-PVDF composites were fabricated by solution processing method. PVDF was dissolved into distillated aceton then CNT was dissolved in acetone and added Triton X-100 4 ml. PVDF solution and the solution of CNT were stirred for 1 hour using a magnetic stirrer, then both were mixed and stirred at temperature of 40 ° C until the acetone evaporates. Composites were molded using a hot-pressing at a pressure of 1 MPa and a temperature of 200oC for 10 minutes. CNT-PVDF composite were characterized by a conductivity test to generate conductivity values​​. The results of the analysis of the test showed that the addition of CNT conductivity on CNT-PVDF composite increased conductivity values​​. In the mass percentage of CNT 2%, 4%, 6%, and 8% conductivity increased slowly. Improved high conductivity of CNTs obtained in the mass percentage of 10%. Key word : Carbon Nanotubes, Polyvynilidene Flouride, composite, and conductivity
Identifikasi struktur sesar daerah manifestasi panas bumi “X” di Kabupaten Manggarai Nusa Tenggara Timur berdasarkan analisis Horizontal Gradient Anik Fitrochaton Chasanah; Agus Setyawan; Dadan Dani Wardhana
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

Area “X” located in Manggarai of East Nusa Tenggara is volcanic area in Indonesia which has the potential for geothermal to be indicated by the appearance of a geothermal manifestation of hot springs and fumarole or sulfatar. Processing data by analysis gradient horizontal has been done to determine the structure of fault. From the map complete Bouguer anomali (ABL) shows anomalies in the middle of the study area which is a crater form of Mount Poco Ranakah, Poco Manggung, Poco Mandasawu and Poco Kasteno. In the southwest of the study area there is a low anomaly associated with alteration zone of rocks and hot springs. The high anomaly to the North of the study area lies in the crumpled hills, so that the area is dominated by high anomaly values. Gradient analysis were performed determine the limits of lithogy and the structure of fault associated with the appearance of hot springs and fumarol or sulfate in the study area. Geothermal manifestastios MAP 6, MAP 7, MAP 8, F/S 1 and F/S 2 controlled by strike slip fault of horizontal gradient. Geothermal manifestations of MAP 1, MAP 4 and MAP 11 are located on geological fault trending Northeast-Southwest  and Northwest-Southeast. Keywords: gravity data, gradient analysis
IDENTIFIKASI PERSEBARAN HIDROKARBON PADA KONGLOMERAT FORMASI JATIBARANG MENGGUNAKAN ANALISIS INVERSI AVO (Amplitude Versus Offset) Retno Septiani; Hernowo Danusaputro; Dimas Pramudito
Youngster Physics Journal Vol 2, No 4 (2013): Youngster Physics Journal Oktober 2013
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

AVO inversion analysis (Amplitude Versus Offset) has been done on  DBT-12 field to identify and map the distribution of hydrocarbons in conglomerat layer, Jatibarang formation, northern part of West Java basin. Sensitiv physical parameters to  separate conglomerate with other litology (lava) are λ/μ, σ and Vp/Vs. Intercept which is obtained is positive while  gradient is negative. AVO anomaly class obtained is IIp can be used as a first indicator content of the fluid is low impedance sand. This reservoir impedance values decrease for the increasing of incidence angle. Besides intercept and gradient AVO attributes which obtained is fluid factor and Poisson reflectivity. Both of these attributes is negative which means changes value of Poisson's ratio is quite large from high to low. Changes in Poisson's Ratio can indicate the existence of a hydrocarbon. Distribution of hydrocarbons DBT-12 on conglomerate layer is northwest - southeast. Keyword : Inversion, AVO, Atributtes, Conglomerat, Hydrocarbon
APLIKASI METODE DOUBLE DIFFERENCE DALAM RELOKASI HIPOSENTER UNTUK MENGGAMBARKAN ZONA TRANSISI ANTARA BUSUR BANDA DAN BUSUR SUNDA Iis Nur Jannah; Titi Anggono; Tony Yulianto
Youngster Physics Journal Vol 5, No 3 (2016): Youngster Physics Journal Juli 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

The region along of zone transition between Banda arc and Sunda arc is very vulnerable region of earthquake disaster because of this region is located at active subduction zone which caused by convergent boundaries of two tectonic plate, Eurasian plate and Indo-Australian plates. Precise catalogue data will be important as references to tectonic and earthquake study in this area. Because that reason, precise hypocenter information is very important. Earthquake relocation is used to calculate earthquake hypocenter to become precisely. The purpose of this study is to get precise hypocenter distribution of zone transition between Banda arc and Sunda arc.The double-difference (DD) method is a relative hypocenter method using residual time data of pairs of events to each seismographic station. In this research used by using P wave travel time from the International Seismological Center (ISC). Earthquake that relocated are earthquake which recorded from 2014 until 2011. The results show relocated hypocenters move toward a certain structure and from a clear pattern of seismicity. A clear seismicity pattern is located in northern 119° which active subduction zone of two tectonic plate. The double-difference (DD) method can provide a significant improvement in the hypocenter location. This is indicated by residual time that decline.Keyword: relocation hypocenter, double-difference method, zone transition between Banda arc and Sunda arc.
ANALISIS SIFAT OPTIK LAPISAN TIPIS BILAYER ZnO/TiO2 YANG DIDEPOSISIKAN MENGGUNAKAN METODE SOL-GEL SPRAY COATING DAN APLIKASINYA SEBAGAI FOTODEGRADASI ZAT WARNA Hanum Yuda Aditya; Heri Sutanto
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

ZnO/TiO2 bilayer thin films have been deposited on a glass substrate by using sol-gel method with spin coating technique. The quality of films deposited on buffer layer is found to be superior to those grown directly on a substrate. The ability of photodegradation of ZnO/TiO2 was observed through the dye test by various molarities of ZnO solution. ZnO sol was prepared by dissolving zinc acetate dehydrate into a solvent of isopropanol then add monoethanolamine and stirred for 30 min at 70°C. For preparing TiO2 sol, titanium tetraisopropoxide is first dissolved in a mixture containing isopropanol and ethanol at room temperature. Then after 30 min stirring, the sol was titrated with a mixture of acetic acid, ethanol and deionized water. The process was followed by 60 min at room temperature. ZnO sol as a first layer is first deposited on a glass substrate and then proceed TiO2 sol on it, for the both deposition was heated at 450oC. The optical properties of ZnO/TiO2 bilayer thin films was characterized by using spectrophotometer UV-Vis. The results showed that the molarity of the ZnO sol affects the optical properties of ZnO/TiO2 bilayer thin films. The band gap energy of the ZnO/TiO2 bilayer thin films with different molarity of ZnO sol respectively 0,1 M, 0,3 M, 0,5 M and 0,7 M has been measured about 3,21 eV, 3,27 eV, 3,32 eV and 3,36 eV. The results of the photodegradation test of the ZnO/TiO2 bilayer thin films have been able degrade methylene blue up to 99,85%, methyl orange 50,68% and batik’s dye 49,87%.Keywords: sol-gel, spray coating, photocatalist, ZnO/TiO2, band gap energy
ANALISIS PENGGUNAAN POLYDIMETHYL SILOXANE SEBAGAI BOLUS DALAM RADIOTERAPI MENGGUNAKAN ELEKTRON 8 MeV PADA LINAC Dodi Junaedi; Evi Setiawati; Zaenal Arifin; Sanggam Ramantisa
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

Percentage depth dose at the Linac has not reached 100% on the surface and should be made an effort to treat skin cancer or skin cancer that is closer to the surface so that the maximum dose obtained cancer, one of the efforts is the use of bolus. The research reviewer feasibility of using polydimethylsiloxane as materials bolus in radiotherapy. Bolus made with a thickness of 3, 6, 9 and 12 mm with a size of 11x11 cm2, tomography image is then taken using a CT-scan to determine the CT-number that is used to calculate the density and compared to the density of mass and volume ratio. Bolus irradiated with electron 8 MeV at 100 MU for 60 seconds and measured the dose absorbed at a depth of 0; 0.5; 1.0; 1.5; 2.0 and 2.5 cm. The result of the calculation using the CT-number density is 1.24 ± 0.02 g /cm3 and the density calculation results using the ratio of the mass and volume was 1.25 ± 0.01 g / cm. Absorbed dose at the surface with the use of a bolus of 3, 6, 9 and 12 mm by 82.09%; 85.13%, 89.12% and 93.48%, while without using bolus which showed the value of absorbed dose amounted to 78.23%. Absorbed dose at a depth of 2.5 cm with the use of a bolus of 3, 6, 9 and 12 mm by 79.84%; 49.26%; 34.52% and 17.80%, while without using bolus which showed the value of absorbed dose amounted to 88.68%.These results show the density of the bolus polydimethyl siloxane has similarities with soft tissue density and may increase the dose of the surface and reduce the dose depth so polydimethyl siloxane may be one of the reference materials that can be used as a bolus in radiotherapy.
KARAKTERISTIK THERMOLUMINESCENT DOSIMETERS UNTUK DOSIMETRI IN VIVO PADA RADIOTERAPI EKSTERNA Mursiyatun Mursiyatun; Evi Setiawati; Zaenul Muhlisin
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 Characteristics of Thermoluminescent Dosimeters (TLD) for in vivo dosimetry in external radiotherapy have been examined. The research was intended to determine the TLD calibration factor and TLD correction factors to various radiation doses, source surface distance (SSD), size field and angle of incidence so that the TLD can be beneficial for in vivo dosimetry. TLD was placed on the surface of solid water phantom and ionization chamber at the reference depth (10 cm). Then was irradiated using 6 MV photons with variation in radiation doses, SSD, size field and angle of incidence. The research  resulted in the TLD calibration factor (4,26 + 0,3) x 10-2 cGy/nC. The value of TLD correction factors at the number of MU 100, SSD 100 cm, size field 10 x 10 cm2 and angle of incidence 00 was 1.Keywords: Thermoluminescent Dosimeters (TLD), in vivo dosimetry, calibration factor, correction factor

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