Much. Azam
Jurusan Fisika FMIPA UNDIP, Semarang

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SIMULASI GERAK PARTIKEL BERMUATAN DALAM PENGARUH MEDAN LISTRIK DAN INDUKSI MAGNET MENGGUNAKAN MATLAB VERSI 7.1

BERKALA FISIKA Vol 10, No 2 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Charged particle motion under external electric, magnetic induction, and electric-magnetic induction field simulation program has been made using MATLAB ver. 7.1 to get the visual description of charged particle motion. The simulation program is made based on non relativistic Lorentz equation.  Each of charged particle’s position and velocity components, which is moved under external electric and or induction magnetic filed(s), is numerically computed using forth order Runge-Kutta method and be made visible by the simulation program. Proper test of the simulation program is made using known text book as the reference. Simulation results which made of 3D profile of charged particle’s motion path  and  each velocity components has already shown that it have good relationship with the known text book   Keywords : charged particle motion, position, velocity

Penentuan Kandungan Unsur Aluminium, Mangan dan Silikon dalam Air Sungai Code Terhadap Waktu Sampling dengan Metode AANC

BERKALA FISIKA Vol 10, No 1 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

An element determination which implied in river Code water below dr. Sardjito brigde with time variation was carried out using fast neutron analysis activation. Water river had been taken away from some dot later mixed, condensed by using an electrical stove from 500 ml to 7 ml. The sample then were iradiated by 14 MeV neutron from neutron generator and then were analyzed by gamma spectrometries.  The qualitative results shown that samples contents Al, Mn and Si. The quantitatively rate of element for aluminium is between 39,50-128,43 ppm, mangan between 71,54-182,80 and silicon between 19,12-84,53 ppm. Key words: FNAA, analysis element contents, Neutron Generator

Penentuan Kandungan Unsur Krom dalam Limbah Tekstil dengan Metode Analisis Pengaktifan Neutron

BERKALA FISIKA Vol 10, No 1 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A determination of chromium which consisted in textile cesspool one of the company of textile residing in Ungaran using neutron activation analysis method.The sample has been threated in the form of sediment sample and liquid sample. The sample then an irradiated by Lazy Susan irradiation facility at Kartini reactor for six hours and then  the counting is done by HPGe detector for 300 seconds. The qualitative results shown that samples contents Cr-51. The quantitatively sediment sample chromium element rate equal to 491. 67 ppm and liquid sample chromium element rate equal  to 0.011  ppm Key words: Neutron Activation Analysis, irradiation.

Kajian Fisis Radiasi Plasma Terhadap Organ Daun pada Pertumbuhan Awal Tanaman Anggrek Phalaenopsis amabilis [Physics Observation of Plasma Radiation for Leaves to Initial Growth of Phalaenopsis amabilis]

BERKALA FISIKA Vol 10, No 1 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The Phalaenopsis amabilis (”anggrek”) has been irradiated by nitrogen ions for growth  accelereting.Irradiation technique used corona plasma technology that its electrodes configuration was point-to-plan geometry to generate nitrogen ions in air. Corona glow discharge Plasma has been generated by DC Voltage of 3.50 kV and current was 0,23 mA.  Nitrogem ions that were irradiated to Phalaenopsis amabilis (”anggrek”) have been bombarded to  leaf organ during 1 to  7 minutes. We used two types Phalaenopsis amabilis control:  control with fertilizer and control without fertilizer. Growing of Phalaenopsis amabilis  can be accellereted about 90 % compare with control without  fertilizer and 30 % compare with control with fertilzer. The maximum growing of Phalaenopsis amabilis by using plasma technology for time irradiation of 1 or 2 minutes.   Key words  : corona glow discharge plasma, Phalaenopsis amabilis (anggrek), nitrogen, ion electrons,  free radicals.

Optimasi Elektroda Pada Sistem Pembangkit Plasma Non Termik untuk Meningkatkan Kuantitas Benih Mangrove

BERKALA FISIKA Vol 9, No 4 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The Mangrove is the tropics  nature resources that has two aspects, economics and ecology. This plant can be  iradiated   by the corona discharge. It is need to radiate mangrove seed with nitrogen and analize it’s  growt.  For that have need optimations of the electrode on the non thermics plasma generator system  in order to get the effective and the efficient radiations.  The steps of the research are : analize system, make a prototype, test the prototype with simulations, compare  the simulations result with the experiment result and analize the results. From the research can get conclution that: 1) had been succes to make prototype of  the mangrove plant reproduction  system by the corona discharge plasma technology with the point-plant electrode, 2) the simulations result show that  electrical fields shall increase if the distance from electrode has been  decreases, or the voltage of electrode has been  incresed, or the distance among electrode has been decreased  or  the value of the electrode radius.has been opotimum, 3) the result of simulations show that the current density  shall  decrease if distance among electrode has been decreased, 4)for the same distance electrode, the electricel fields of the experiment results  is bigger than the simulations result, because the value of permeability and permittivity medium on the simulation is using the  value of    the vaccum  space.     Key words : the non thermics plasma, iradition, Mangrove

Pengukuran Tebal Kontaminasi Zat Radioaktif pada Permukaan Tanah Secara In Situ Menggunakan Spektrometer Gamma Portabel

BERKALA FISIKA Vol 9, No 4 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Determination of contamination’s thickness on the ground for  homogeneous  source compound Cs -137 and Co-60 use portable gamma  spectrometry with height purity germanium detector ( HPGe detector) have been done.There are two methods to determine contamination’s thickness on the ground surface. The first method is Korun’s modification by looking for the total count of gamma ray before and already to experience attenuation for Cs-137 and Co-60 then divided by the decrease of linear attenuation coefficient Cs-137 and Co-60. The second is Xu comparison method by made variation of distance from ground surface to detector surface then compared with total count of gamma ray from one source Cs-137 or Co-60 during counting time. The results from experiment obtained for Korun’s modification for the actual thickness 10 cm, 20 cm and 24 cm have an error at 2 % , for actual thickness 12 and 16 cm,and an error at 3 %, for actual thickness 6 cm and 8 cm an error of 4 % and, for actual thickness 4 cm have an error at 9 %. Then for the Al Ghamdi  to Xu Comparison method,  for Co-60 in the actual thickness 6 cm and 10 cm have error 3 % and 12 %, and for Cs-137 in the  actual thickness 10 cm and 6 cm have error 9 % and 48 %.   Key words:  HPGe detector, portable gamma  spectrometry, contamination, Korun’s modification and Xu comparison method.

Respon Non Linier Sifat Optis Larutan MgSO4

BERKALA FISIKA Vol 9, No 3 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A response of nonlinear optic of several salt solutions in external magnetic field has been studied. An altered magnetic field varies from 0 until 0,2T used to induce samples, and then change of polarization angle b is measured by polarizators, where the direction propagation of laser is perpendicular to the direction of B. Various concentration of solution is used at 5% until 35%. Our experiment shows that the graphs of b vs. B are still linear for mineral water and NaCl solution. However, for MgSO4 solution, we obtained polynomial tendency of this graph. At 20% until 35% of concentration of this solution it has polynomial in third order. Keywords: Nonlinear optics, change of polarization angle, external magnetic field.

Penentuan Karakterisasi Cerrobend Sebagai “Wedge Filter” Pada Pesawat Teleterapi 60Co

BERKALA FISIKA Vol 9, No 3 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Wedge filter usually used in cavum nasi ossa maxillaris tumor therapy. And usually it is made of timbal. However, cerrobend as the alternative material is possible and needed too. The material characterization is done through determining the linear absorption coeffisien of cerrobend and the proportion of the thickness of cerrobend to timbal,  and as well as comparing the total treatment dose rate of timbal wedge filter with cerrobend wedge filter. Based on the result of the research, it is found that the linear absorption coeffisien value of cerrobend wedge filter with energy of 1.33 MeV is 0.43% cm-1. The average ratio of the thickness of cerrobend to timbal is 1.485 ± 0.002, and the difference of the total treatment dose rate between those two wedge filter is only a little, that is 0.72 cGy/minutes.  Keywords : cerrobend, wedge filter and the linear absorption coeffisien

UJI HASIL KINERJA MESIN PENGOLAH FILM OTOMATIS MINI MEDICAL

BERKALA FISIKA Vol 9, No 2 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Have been researched result test of Mini Medical automatic processing film machine. The research is conducted by reforming X-ray toward the film in the cassette which there is stepwedge on it, film catharsis is then performed using automatic processing film machine. After generating radiograph, its density is measured, and then we count speed index, fog index and contrast index. This activity is conducted every day for seven days in succession. Based on the index of fog and contrast film, the result of the research indicates that the work result of automatic processingn film machine on the first until fifth day is still in the allowed limits, but on the sixth and seventh day it exceeds the permitted limits. This is due to the ability of generator solution is getting lower (solution pH is getting smaller). Mean while, its speed index for seven days is still in the permitted limits.   Keywords : Result test, automatic processing film machine, stepwedge, fog,  contrast

Penentuan Dosis Gamma Pada Fasilitas Iradiasi Reaktor Kartini Setelah Shut Down

BERKALA FISIKA Vol 9, No 1 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Determination of gamma dose after reactor shut-down around the kartini reactor core have beeb done. The measurement was done at the Lazy Susan (Rotary Rack) and outside the reflector wall which could be used as irradiation facility. Determination of gamma dose was carried out using wide range dosimeter consisting of a Geiger muller detector end a surveymeter. Detector was directed to outside wall reflector and lazy susan through the dry irradiation facility. Measurement was done after shut down for 3 hours with power of 100 kW and interval of ± 5 minutes. The resulting dose rate in reflector wall without neutron source was 1,2 to 0,2 kR/hour and cumulative dose in a 205  minute period was 2,21 kRad. In reflector wall with neutron source was 6  to 0,2 kR/hour and cumulative dose in a 202  minute period was 2,25 kRad.  While in lazy Susan dose rate of 60 to 2 kR/hour and cumulative dose was 42,70 kRad in 203 minutes decay. Gamma decay constant in reflector wall without  neutron source was 0,008 per minute, with neutron source 0,013 per minute. While in lazy Susan gamma decay constant was 0,014 per minute. Keywords : dose, gamm, core and  reflector, reactor