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INDONESIA
YOUNGSTER PHYSICS JOURNAL
Published by Universitas Diponegoro
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Physics
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Articles 282 Documents
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IDENTIFIKASI POTENSI AKUIFER BERDASARKAN METODE GEOLISTRIK TAHANAN JENIS PADA DAERAH KRISIS AIR BERSIH DI KOTA SEMARANG Octaviani Sarmauli; Agus Setyawan; Dwiyanto JS
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

Semarang city has a unique geological rock formations constituent layers in each region. The uniqueness of the identification of the presence of roundwater show that is different. Groundwater reserves in fulfilling the water requipments decreasing due to population growth, industrial growth and infrastructure development. This study aims to identify potential of aquifer to know the type of lithology layers, thickness and depth. The method used in this research is a geoelectric resistivity Schlumberger configurations with measurement points are Cangkiran, Cepoko, Ngadirgo, Gunungpati, Pakintelan, Pesantren, Tandang and Rowosari. The results suggest the potential for aquifer interpretations are based on the value of resistivity 19,6 Ωm – 92,5 Ωm with lithology as a sandstone. The aquifer grouped into the deep aquifer and the shallow aquifer. Deep aquifer has range of depth between 50-100 meters on point CA-3, CA-4, CE-1, CE-2, NG-2 and TA-1. Shallow aquifer has range of depth between 10-4 meters on point of GP, NG1, PA, PE and RO.
PERBANDINGAN DOSIS TERHADAP VARIASI KEDALAMAN DAN LUAS LAPANGAN PENYINARAN (BENTUK PERSEGI DAN PERSEGI PANJANG) PADA PESAWAT RADIOTERAPI COBALT-60 Dortua Helena Sidabutar; Evi Setiawati
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

A research on the determination of the dose of radiation to the shape of the field square and rectangular fields, this is because the cancer is irregular morphology (irregular). If the radiation dose given is not in accordance with the size, as well as cancer cell geometry is happening is damage healthy tissue surrounding the cells. Determination of the dose is done by adjusting the gantry position Cobalt-60 aircraft at an angle of 0 °, the distance (SSD) radiation source 80 cm from the surface of the phantom which has been coupled with an electrometer and computer devices. For wide field irradiation with a square shape set with field size (6.6 x 6.6), (10.8 x 10.8), (12 x 12), (13.3 x 13.3), and (14 , 2 x 14.2) cm. For a broad field with a rectangular field shape is set by the size (5 x 10), (10 x 12), (10 x 15), (10 x 20) and (10 x 25) cm. Further irradiation for each phantom depth of 1, 3, 5, 7, 9 cm for 60 sekon in a sequence corresponding variations in the size of the specified field as much as 3x (three times) measurements, so that the average value obtained. From the determination and comparison of research results in the field of irradiation dose to the shape of square and rectangular fields, obtained dose values between square and rectangular field is almost the same, is the difference between 0.04 to 1.30 Gy. This result is certainly more convincing in the broad field of use square and rectangular fields in conducting irradiation. This result has also been successfully proven formulation A / C that has been done. Then the value of the dose received phantom decrease with increasing depth phantom is used, with the state of doses already passed the point of his dmax.Keywords: radiotherapy, irradiation field, the depth of phantom
Identifikasi sifat fisis batuan reservoir karbonat menggunakan inverse acoustic impedance (AI) model sparse spike pada lapangan “ABDUH” formasi Kujung Cekungan Jawa Timur Utara Saad Abdurrahman; Udi Harmoko; Agung Ardiyanto
Youngster Physics Journal Vol 6, No 2 (2017): Youngster Physics Journal April 2017
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Physical rocks properties identification on "ABDUH" field, North East Java Basin has been done by acoustic impedance seismic inversion. The research aim conducted to predict the physical properties of rock by  acoustic impedance inversion value and the porosity distrubution by linier programming sparse spike. Sparse spike linear programming method assumes that a reflectifity regarded as the model a series of rarely spike and the big value deconvoluted with a new spike smaller than before maked it more accurated. This study used at single well and seismic 3D data post stack time migration is the area on research. Then with assumes a linear relationship between acoustic impedance and log porosity log based crossplot, obtained linear equation which was used to get the distribution of porosity from the distribution of acoustic impedance. Inversion results show the distribution of reefs on Kujung Reef formation has the porosity value 21-27% and the acoustic impedance vaue 17.000 to 28.000 ft/s.g/cc.Keywords: Acoustic Impedance, Kujung Reef, Porosity, Linier Programming Sparse Spike Inversion
VERTICAL TRANSVERS ISOTROPY (VTI) PRE STACK DEPTH MIGRATION ANISOTROPI UNTUK PENCITRAAN STRUKTUR BAWAH PERMUKAAN YANG LEBIH AKURAT Ibnu Rasid; Udi Harmoko; Agus Setyawan; Teguh Suroso
Youngster Physics Journal Vol 1, No 1 (2012): Youngster Physics Journal Oktober 2012
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Anisotropic Pre Stack Depth Migration method has been carried out for 2D seismic reflection data on Line “IR” The simplest form of anisotropic media (VTI (Vertical Transverse Isotropy) was used. Theoretically, this form requires two parameters to describe the media, those are δ (delta) and ε (epsilon). δ is an anisotropy parameter that describe velocity variation near to vertical while ε is an anisotropy parameter that describe velocity variation near to horizontal. The anisotropic Pre Stack Depth Migration produce a section which has corrected build up image and has change to be the true of reflector in 67 m of depth. Base on well and seismic data calculation process, an anisotropic parameter is in the range of 0.050-0.058. Generally, Anisotropy Pre Stack Depth Migration method gave better result than isotropy Pre Stack Depth Migration. Key Word: Anisotropy, Pre Stack Depth Migration, VTI, delta, epsilon
UJI KUALITAS MINYAK GORENG KELAPA SAWIT MENGGUNAKAN METODE POLARISASI ALAMI DENGAN VARIASI LINTASAN OPTIS Tommy Andri Palembangan; K Sofjan Firdausi
Youngster Physics Journal Vol 4, No 2 (2015): Youngster Physics Journal April 2015
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

According to Indonesian National Standards, the parameter of quality test of cooking oil consists of many aspects, accompanied by its various methods. Both the parameter and methods can't be done simultaneously. It takes a long time and quite expensive costs. Through this paper, proposed that the active optic parameter is an alternative parameter of cooking oil which experiencing some treatments.The tested sample is the palm oil, and its active optic character being measured by the change of polarization angle. The source of light which used in this experiment is a 100 watt fluorescent lamp. The sample condition divides by some parts, they are the new ones, old ones, after-used ones, and the expired ones. A place to put the sample called cuvette with the various optical track, started from 1 to 5 cm.The result of the experiment showed that the active optical properties changes linearly, depends on the length of optical path, however it's not linear with the concentration of oil. The parameter of the active optical properties is sufficient enough to show the quality of palm oil. Good quality of oil indicated by the swivel angle of the form is smaller than the oil with bad quality. This is in accordance with the validation result of Free Fatty Acid (FFA) test. In the future, this method can give accurate information and complete the parameter of quality standards which used nowadays, furthermore it's possible to applied to another form of oil. Keywords: Optical properties, the quality of palm oil, natural polarization.
Metode polarisasi transmisi untuk deteksi cemaran lemak babi pada minyak goreng Nidia Kharisma Putri; Ketut Sofjan Firdausi; Heri Sugito
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

This study was conducted to search for "fingerprint" of the existence of lard in vegetable  oil contaminated by lard as an evaluation of the halal of cooking oil by using transmission polarization method. The sample used was palm oil that has been mixed with chicken oil and lard. The light source used was green laser with wavelenght 532 nm. Measurement was conducted based on change of polarization transmission angle, with addition of external electric field produced by two parallel plates connected to 0-6kV DC voltage. The result shows that contaminated palm oil has greater polarization angle changes than pure palm oil. And  palm oil that has been contamined by lard has the greatest polarization angle than a pure palm oil and palm oil contaminated by chicken oil. Transmisson polarization method can be used to evaluate halal of cooking oil.Keywords: Polarization, Electrooptics,Cooking oil, Halal
RANCANG BANGUN SISTEM PENGHITUNG PENGGUNAAN AIR PRABAYAR MENGGUNAKAN MIKROKONTROLER PIC16F877A Faisal Rahman; 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

The water recording that still uses manual system has many shortcomings, including error recording by officer, inaccurate of water meter reading, so that many customers feel disadvantaged. The purpose of the research is to make water usage system that can minimalize Mistakes done by the Officers by making prepaid payment system. The water flowed ON flowmeter will rotate the rotor so that it can result clock that becomes input for PIC16F877A to be displayed ON LCD. The number of clock will be characterized with the amount of water that was released so it obtains equation. The equation is put on Program so LCD Output is the amount of water flowed ON flowmeter. The result from Flowmeter characterization is 0.999. The flowmeter test is done by comparing it with standard tools, it obtains correlation coefficient 0,996 with 1,3 % error and test cost is 0.05 %.
EVALUASI METODE PENENTUAN HALF VALUE LAYER (HVL) MENGGUNAKAN MULTI PURPOSE DETECTOR (MPD) BARRACUDA PADA PESAWAT SINAR-X MOBILE Handini Devi Yunitasari; Evi Setiawati; Choirul Anam
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

The dose received by the patient and the radiographic image quality is determined by the value of the half value layer (HVL). Multi Purpose Detector (MPD) Barracuda, produced by RTI Electronics, Sweden, is a solid state detector that can be used to measure the value of HVL just one exposure. This study was conducted to evaluate the accuracy of measurement of the HVL’s value with single exposure methods using the MPD Barracuda. In this study the value of HVL measurements performed with distance of focus to detector 100 cm, field size of 10x10 cm2 and times- current 12.5 at a voltage of 50 kVp, 60 kVp, 70 kVp, 81 kVp and 90 kVp.  HVL measurement for single exposure method  conducted without the addition of Al filter. As for comparative used standard methods that use some thickness variation of filters from 0.5 to 5.0 mmAl. In the standard method, determination of HVL values calculated in two ways: interpolation formula and method of graphs. The results showed that the value of HVL using MPD Barracuda with single exposure method produces a lower value than the standard method used multiple filters and HVL calculated by interpolation and graphics.Keywords: Half Value Layer (HVL), Multi Purpose Detector (MPD) Barracuda, X-ray.
INTERPRETASI STRUKTUR BAWAH PERMUKAAN MENGGUNAKAN METODE MAGNETIK (DAERAH SEKITAR SUNGAI OYO YOGYAKARTA) Dewi Saroh Muzhaffar; Muhammad Irham Nurwidiyanto
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

Magnetic survey has been carried out in the area of Central Java DI Yogyakarta, arround Oyo River, aims to interpret the subsurface structure of the fault zones surrounding Patuk, Dlingo and Playen district. In this study, magnetic data acquisition was carried out in 70 points by using a PPM (Proton Precession Magnetometer) geometrics 856X models to get the values of the total magnetic field. Data Processing began with International Geomagnetic Reference Field (IGRF) to get the total magnetic anomaly. The total magnetic anomaly contour created by using Surfer that has been used to process upward continuation and then made reduction to the poles. The result of research showed the magnetic anomaly closure pair of positive and negative indicated a fault zone below the surface. The closure pair of positve and negative close to Oyo River was made an incision to determine the subsurface structure of the region by creating a model of 2-dimensional (2D) and a model of 3-dimensional (3D). In 2D modelling result show that there was a fault zone at 650 meters depth at the x coordinate 444942(UTM). It is characterised by changes on the contrast susceptibility values 0.3241 and 0.3225 on the third layers. The interpretation was reinforced by the result of 3D modelling in the area. The fault suspected to be around arround Oyo River, Gunung Kidul with north-south direction.
KOREKSI KURVA ISODOSIS 2D UNTUK JARINGAN NONHOMOGEN MENGGUNAKAN METODE TAR (TISSUE AIR RATIO) Ryan Kurniawan; Vincensius Gunawan; Choirul Anam
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

Treatment Planning System (TPS) are used to determine the dosedistribution to be received before the irradiation in patients. To see how much radiation dose to be received on the target volume and surrounding critical organs that are required isodose curve. 2D isodose curves correction on non-homogeneous tissues done because in fact the human body not only in the form of soft tissue, but there are also other tissues such as bone tissue or lung. Isodose curve correction have been made using Tissue Air Ratio (TAR) method with Matlab software on a wide field of 10 x 10 cm2. Correction factor is obtained by comparing the effective depth of the TAR with TAR at each depth. Correction factor multiplied by the curve isodose for homogeneous phantom have been obtained from Percentage Depth Dose (PDD) and dose profiles. Corrected isodose curves obtained for nonhomogeneous phantom. Higher the density value on nonhomogeneous phantom, the attenuation will increase and produce the lower dose. Keywords: Treatment Planning System (TPS), 2D Isodose curve, Tissue Air Ratio (TAR), Correction factor, nonhomogeneous tissue, attenuation

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