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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 ANTARMUKA KOMPUTER UNTUK PENGHITUNGAN LAJU ALIRAN KALOR KONDUKSI PADA MATERIAL PADAT MENGGUNAKAN PROTOKOL RS485 Nailatul Ilmi; Suryono Suryono
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

This research is about computer interface system for determining conduction heat flow rate on massive material using RS485 protocol. The system can be used for monitoring equipment in an industrial feasibility by measuring the rate of heat flow simultaneously at some measuring points of each measurement point that consists of some channels.Heat flow rate monitoring system uses temperature sensor LM35. This sensor serves to convert the temperature into a voltage whose  the results converted into digital signals by the ADC0 and ADC1 microcontroller which then signals are transmitted to the computer using the RS485 protocol.This system has been realized and can display the measured temperature at two different measurement points with two input channels and this system can also calculate the heat flow rate of each its points. The obtained results can be displayed graphically and also can be stored in Microsoft Excel. Keyword : heat flow rate, RS485 protocol, monitoring system, temperature sensor LM35
ANALISA INVERSI ACOUSTIC IMPEDANCE (AI) UNTUK KARAKTERISASI RESERVOIR KARBONAT PADA LAPANGAN “X” FORMASI PARIGI CEKUNGAN JAWA BARAT UTARA Luxy Rizal Fathoni; Udi Harmoko; Hernowo Danusaputro
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

Acoustic Impedance (AI) inversion method has been applied to describe characterization of carbonate reservoir in the field “X” North West Java Basin. The aim of this research is to determine the distribution of hydrocarbon prospect area that based on AI value and porosity value parameters. The used of Acoustic Impedance (AI) inversion methods is model based methods. The of model-based method is consist of geologic model construction then we compare to the real seismic data. Then by assume linear relationship between AI log and porosity log, and we have a linear equation that used to obtain the porosity distribution from AI distribution. Inversion result shows porous limestone distribution which has porosity range value about 0,21 – 0,23 fraction and acoustic impedance range value about 6800 – 8000 gr/cc.m/s with the directional distribution northwest – southeast. Keywords: Acoustic Impedance, Limestone, Porosity, Model-based method
STUDI PENGARUH LAJU ALIR LARUTAN PADA SISTEM DESALINASI METODE FLOW-THROUGH CAPACITOR (FTC) DENGAN ELEKTRODA DARI KARBON AKTIF DAN CARBON NANOTUBES (CNT) Romi Buana Puja Pangestu; Agus Subagio
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 electrodes are made of a combination between the CNT and the activated carbon had been created as a method of desalination systems the flow-through capacitor (FTC). The FTC  is one method desalination done by flowing salt water passed the between electrodes based on the principle capacitor. The addition of the CNT on activated carbon as electrode will hopefully increase the conductivity and resistivity on activated carbon reduces that provides increased absorption. System optimization testing FTC desalination is carried out by the time of voltage and variation flow rate solution.Fabrication of electrodes are made of mixed a primary ingredient CNT to the activated carbon with a comparison of 10:90 (% wt) and urotropin to the phenolic resin Binder ratio10:90 (% wt). Comparison of carbon : fastener end of 80:20. The electrodes are formed with method of hot-pressing and heated for 30 minutes at a temperature of 1800C . The electrodes are  resistance tested and characterized using SEM to saw the shape of the morphology of the electrodes.Prototype tested results with 7 pairs of electrodes 10% CNT could separated a compound salt of solution 1785 mg/L during 120 minutes with a flow rate 5 mL/min of 57%. Tested by conduktivitimeter at flow rate variation 5, 15, 25, and 35 mL/min had the lowest concentration of the solution on the reduction in flow rate 5 mL/min. But the solution that had passed through the electrodes on the low flow are much less than with a high flow rate.Keywords : Electrodes, desalination, FTC, CNT, activated carbon.
RANCANG BANGUN SISTEM TOKEN PULSA PENGGUNAAN AIR PRA-BAYAR METODE ENKRIPSI TRANSPOSISI DAN DEKRIPSI ALJABAR BOOLEAN Rima Ayuning Ratri; Kusworo Adi
Youngster Physics Journal Vol 5, No 1 (2016): Youngster Physics Journal Januari 2016
Publisher : Jurusan Fisika, Fakultas Sains dan Matematika, Universitas Diponegoro

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Abstract

Water supply company is currently still using analog counter system to determine the volume of water that has been used by customer. After officers did manually recording then customer make a payment according  the volume of water used. This system raises many problems include, payment arrears, the recording of water  unsuitable and customers can’t to arranged the water. So, we needs a system that can to overcome it all. Water counters prepaid system uses token that contains important information such as the customer's ID, date of purchase and nominal credit tokens. To maintain secrecy and make disposable token, cryptographic process carried out by the method of transposition. To use the token decryption process is done by microcontroller PIC16F877. Decryption process performed by implementing the Boolean Algebra.  Results from this research are created of water counters prepaid system by using a token and has  100% success rate. Water counter prepaid system are expected to reduces cheating  on analog water counter and customers can arrange the water needs.Keywords: Water prepaid system, Token, Cryptographic, Transposition, PIC16F877A.
IDENTIFIKASI STRUKTUR BAWAH PERMUKAAN MENGGUNAKAN METODE GEOLISTRIK KONFIGURASI SCHLUMBERGER DI AREA PANASBUMI DESA DIWAK DAN DEREKAN KECAMATAN BERGAS KABUPATEN SEMARANG Sigit Darmawan; 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

Diwak and Derekan is one of geothermal manifest which exist in geothermal system of Ungaran. Geoelectric method schlumberger configuration is one of the geophysical methods that used in the exploration of natural resources below the surface. The purpose of researching is to know layer of subsurface structure which control Diwak and Derekan geothermal manifest.Field measurement data in the field are potential differences and currents which can be used to calculate apparent resistivity value. After apparent resistivity value is created then processed using IPI2WIN program to know resistivity value in each layer with geology information validation.The results of the study showed six geoelectric layer of rock that is composed of layers of mudstone, siltstone, tuff, sandstone brecia and pasirtuf with resistivity values and different thicknesses. Interpretation of manually indicate the presence of two down faults that are weak zone where the fluid surface discharge Keyword: Geoelectric, Schlumberger, Geothermal, Fault, Diwak and Derekan
ANALISIS POROSITAS DAN SATURASI AIR DALAM INTEGRASI PETROPHYSICS DAN SEISMIC MULTIATTRIBUTES UNTUK KARAKTERISASI RESERVOIR Gian Antariksa; Hernowo Danusaputro; Tony Yulianto
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

Plan of Development I is the development plan of one or more oil and gas fields in an integrated way (integrated) to develop and produce hydrocarbon reserves. Field development was conducted in order to know the area indications of hydrocarbons based on petrophysics analysis and determine its content with multiattributes. By integrating the study of seismic data, well data (including petrophysical analysis) with geological and stratigraphic information is a necessary step to determine the characteristics of a reservoir. Formation evaluation and petrophysical analysis as an initial stage to characterize the reservoir by studying rock properties such as volume of clay, porosity and water saturation. Multiattribut seismic analysis is used to predict the physical properties of the rock as a whole in the seismic volume. Based on the results of the petrophysical analysis of the target porosity ranges from 11% -14%, from the netpay statistical data lumping results have value Net to Gross range of 7% to 40%.and water saturation ranging from 18% -38%. Seismic multiatributtes method can predict petrophysical analyzes well in the target zone.
ANALISA PENGARUH FAKTOR EKSPOSI TERHADAP ENTRANCE SURFACE AIR KERMA (ESAK) Muahamad Irsal; 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

The research has been analyzed of the effect of exposure factors at the entrance surface air kerma (ESAK) of the thorax radiographs. This research uses anthropomorphic phantom, multipurpose detectors, FFD 100 cm, with radiation field 25 cm × 25 cm. irradiation conditions is given by the variation of expose factors using tube voltage 50-100 kV and tube current-time 2-20 mAs. The results of research showed that the effect of the tube voltages to the entrance surface air kerma experience is increase a specific approximated by an polynomial equation with a correlation coefficient value R2 = 1 and the variation of the tube current-time increased linearly approximated by a approach linear equation R2 = 1, uses of tube current time under 4 mAs with resulted lower the entrance surface air kerma based on IAEA Safety Series No. 115 (1996) is 0.4 mGy at examination of thorax radiographic, and conducted a calculation uncertainly  value of every expose factors using variations of tube voltage and tube current-time based on scenarios three of IAEA Technical Report Series No. 457(2007).Keywords: entrance surface air kerma, thorax radiography, the tube voltage, tube current-time, phantom anthoropomorphic.
Analisis hamburan kuantum menggunakan diagram Feynman untuk kasus teori ϕ3 Septian Adhi Nugroho; Asep Yoyo Wardaya; Dwi P. Sasongko
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

Scattering is the most important key in particle physics. Quantum field theory/ QFT discusses much about scattering of the particles which are reviewed in any dimensions and depend on the lagrangian forms. In this ϕ theory research, lagrangian concept along with the Green function become its based on the calculation of the generating function of Z[J]. The function is a generator when we analyze the forms of Feynman diagram. In the process of the calculation, we will have an infinite series. That function is used to determine the drawing of Feynman diagrams consist of the vertices and propagators. So that the form of diagram may be able to be analyzed. In this research, there will obtain an infinite series which has to be cut to second order for simplicity case. In the first order, we will obtain 2 types of diagram and in the second one we have 8 types of diagram. There are 10 types of the diagram in total which consist of 7 types of connected diagram and 3 types of disconnected diagram.Keywords: scattering, QFT, lagrangian, Green function Feynman diagram, vertice, propagator, infinite series
HUBUNGAN ANTARA POLINOMIAL JONES (ASPEK NON-PERTURBATIF) DAN VACUUM EXPECTATION VALUE DARI OPERATOR WILSON LOOP (ASPEK PERTURBATIF) DENGAN MENGGUNAKAN AKSI CHERN SIMONS WITTEN Frangki Leko; Asep Yoyo Wardaya
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

Perturbatif aspect of Chern Simons Witten theory is viewed as value of Vacuum Expectation Value (VEV) of Wilson loop operator while non-perturbatif aspect of Chern Simons Witten theory is viewed as value of Jones Polynomial. Both aspects will be compared. Calculation of Jones Polynomial is counted by using braiding formula concept which later will be applicated to (SU)2 gauge group. VEV calculation of Wilson loop operator is counted by using Feynman’s diagram and by using vertex and propagator values. Both calculations will be counted to second order of coupling constant. The result of this research indicate that value of pertubatif aspect and non-perturbatif aspect is same although both aspects was counted by two different methods. Keyword : Chern Simons Witten, Vacuum Expectation Value, Wilson loop, Jones Polynomial.
PEMBUATAN KURVA ISODOSIS 2D UNTUK BERKAS ELEKTRON ENERGI 5 MeV MENGGUNAKAN PROFILE DOSE DAN KURVA PERCENTAGE DEPTH DOSE (PDD) UNTUK TREATMENT PLANNING SYSTEM RADIOTERAPI Mahfudz Fauzan; Vincensius Gunawan; Choirul Anam
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

Research has been done to make isodose curve of electron beam with the energy of 5 MeV. Isodosis curve performed using PDD curves and dose on broad Profile 10x10 cm2 field; 15x15 cm2; 20x20 cm2; 25x25 cm2, with a depth of 0.5 cm; 1.0 cm; 1.5 cm; 2.0 cm; 2.5 cm. The purpose of this study was to obtain 2D isodose curve shape can be applied to TPS in Radioteraphy.The method which was used to form the isodose curve using PDD curves and dose profiles was done by equalizing the data at each depth using interpolation techniques at intervals of 0.25 cm and normalized to a value of 1, and calculatd the dose at each pixel using the weighting technique that formed isodosis curve with the distribution each depth and broad field. The results show that the PDD curve formed using the interpolation does not affect the magnitude of the dose at different field wide, profile shaped dose showed a dose level at each different depth and normalized to a value of 1 to show the dose at the surface, the isodose curve formation can be applied to compare the isodose curve formed by TPS in Radiotherapy. Keywords: Radiotherapy, Treatment Planning System (TPS), isodose curve, Percentage Depth Dose (PDD), Profile dose

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