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BERKALA FISIKA
Published by Universitas Diponegoro
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Core Subject : Science,
Physics
BERKALA FISIKA adalah jurnal saintifik yang diterbitkan secara periodik 3 bulanan. Jurnal ini memuat kajian-kajian Fisika baik kajian teoretik maupun hasil eksperimen. Jurnal ini juga memberi ruang yang luas bagi kajian – kajian aplikasi fisika dalam bidang teknologi, ilmu-ilmu hayati dan kedokteran.
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Articles 369 Documents
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Cover Berkala Fisika Hidayanto, Eko
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014
Publisher : BERKALA FISIKA

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Abstract

Vol 17 No.1 2014
Studi Peningkatan Output Modul Surya Dengan Menggunakan Reflektor Sidopekso, Satwiko; Febtiwiyanti, Anita Eka
BERKALA FISIKA Vol 13, No 3 (2010): Berkala Fisika
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Abstract

Efforts to optimize the power output of solar modules using a mirror. In this study used 2 pieces of flat mirrors as solar reflectors mounted on the right and left of the solar module. Measurement is done by directing the position of solar modules in order to obtain optimum results with a corner reflector 50 0, 600, 700. Based on the measurement results, we obtained at maximum power cost solar modules using the corner reflector 600. The increase in power output compared to 92.7% without using a reflector.   Keywords:  reflector, solar module, output power
Interpretasi Data Seismik Refraksi Menggunakan Metode Reciprocal Hawkins dan Sofware SRIM (Studi Kasus Daerah Sioux Park, Rapid City, South Dakota, USA) Wahyuningrum, Sri; Yulianto, Gatot; Nurwidyanto, M. Irham
BERKALA FISIKA Vol 9, No 4 (2006): Berkala Fisika
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Data processing of seismic refraction has been done. This data processing was the secondary data from seismic measurement result in the Sioux Park area, Rapid City, South Dakota, USA using EG refraction & G Geometrics Model ES-1210 seismic refraction instrument made in America with 12 geophones. The seismic refraction data processing was to determined the velocity and the deepness of eachs layer, and make geology under surface model then to interpreted the the data processing result using Reciprocal Hawkins method and SRIM software. On the seismic data processing used Reciprocal Hawkins method and SRIM (Seismic Refraction Inverse Modelling) software. Reciprocal Hawkins method used time depth concept and SRIM software used delay time concept. The time depth value or the delay time value was same with a half value of intercept time.The result from the data processing using Reciprocal Hawkins method was obtained threes layer, that are the seismic wave velocity of the first layer is 1013 ft/s, the second layer is 4007 ft/s and the third layer is 6887 ft/s. While the result of the deepness calculation obtained the deep of first layer range is 0,93 ft – 11,24 ft, the second layer ranging is 8,72 ft – 19,38 ft and from data processing the result using SRIM software obtained seismic wave velocity of the first layer is 970 ft/s, the second layer is 3485 ft/s and the third layer is 6150 ft/s, while the result of deepness calculation of the first layer range is 0,10 ft – 7,20 ft, the second layer range from 3,40 ft – 27,00 ft. From the under surface image model can be interpreted that the first layer is mouldy  layer which represent cover layer, the second layer is clay stone layer, sand ( dry, having the pass character) and third layer is napal stone at Spearfish formation which has impermeable characteristic or waterproof. Key words: delay time, intercept time, Reciprocal Hawkins method, seismic refraction
PENENTUAN STRUKTUR KRISTAL AlMg2 ALLOY DENGAN DIFRAKSI NEUTRON Ismul Hadi, Arif; Sumariyah, Sumariyah; Dahlan, M.; Mohtar, Mohtar
BERKALA FISIKA Vol 14, No 2 (2011): Berkala Fisika
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The determination of crystallography structure of AlMg2 alloy has been done by neutron diffraction. In fabrication process, it was addressed by rolling phases. The first by hot rolling with thickness follows: 8.35 mm; 7.00 mm; 5.6 mm; 2.60 mm; 1.65 mm ± 0.05 at  425 0C temperature extended by cold rolling: 1.65 mm to 1.30 mm ± 0,07 thickness at normal temperature. Counting of the data was started by activate of detector from 110 to 400 angle with 0.075 overstep and preset monitor count of 60,000 at 26 MW. Processing of the data using of microcomputer 16 bit NEC PC-9801 VM2. The results show that the AlMg2 alloy structure are FCC system with lattice parameter (a) = 4.0817 A0.   Keywords: AlMg2 alloy, neutron diffraction, and FCC
Penentuan Dosis Gamma Pada Fasilitas Iradiasi Reaktor Kartini Setelah Shut Down Prasetyowati, Risprapti; Azam, Much.; Firdausi, K. Sofjan; B. S., Edi Trijono
BERKALA FISIKA Vol 9, No 1 (2006): Berkala Fisika
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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
SISTEM SENSOR NIRKABEL UNTUK MONITORING EFISIENSI PANEL SURYA Pakradiga, Ahlan; Suryono, Suryono
BERKALA FISIKA Vol 22, No 2 (2019): Berkala Fisika Vol. 22 No. 2 Tahun 2019
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Solar panels are devices consist of several solar cells that convert light into electrical energy. In order to work optimally, a monitoring system to electrical current, voltage, and light intensity in solar cells is needed. The monitoring system can be wirelessly carried out, so that solar panels can be remotely monitored without having to go to the field. The solar panel monitoring system used a wireless sensor system that uses sensors, System on Chip (SoC) WiFi Microcontroller, and computers. The sensors used were ACS712 current sensor, voltage sensor, and BH1750 light intensity sensor module. Before it was used, the current sensor and voltage sensor should be characterized and calibrated. Data stored in the database can be processed to calculate savings on solar panels in real time using php programming, then it was transferred to the web. The characterization equation for the current sensor is y = 944.9x + 13597.0, the average error for calibrating the current sensor is 3.39%. The characterization equation for the voltage sensor is y = 471.2x – 206.2 and the average error for the voltage sensor calibration is 0.77%. Sensor calibration is obtained by an average error of 1.10%. The efficiency of solar panels at bright times is 12.49%. In this study, it has been found that the efficiency of solar panels is influenced by the intensity of sunlight.Keywords: solar panel, monitoring system, remotely, sensor, efficiency of solar panels
Pengaruh Teknik Tegangan Tinggi Terhadap Entrasce Skin Exposure( ESE ) dan Laju Paparan Radiasi Hambur Pada Pemeriksaan Abdomen Dhahryan, Dhahryan; Setia Budi, Wahyu; Azam, Much
BERKALA FISIKA Vol 11, No 3 (2008): Berkala Fisika
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Abstract

The measurement for influence of high voltage technique to Entrance Skin Exposure and is Rate of Scattered Radiation Exposure on abdomen inspection has been conducted. The ESE measurement is conducted using Electrometer and is calculated by semi empirical method, while in measurement of rate of scattered radiation exposure using survey meter at a distance of 100 cm from the object by varying data intake points and its direction of detector. The result indicates that the usage of high voltage technique yields absorbent dose of 124 mrad and radiation exposure of 339 mR. It is lower than the standard value of absorbent dose of 322.7 mrad and radiation  exposure of 130,5 mR. The result of measurement is higher than calculation. In measurement of exposure of scattered radiation rate with detector position faced to object, on right side of cathode, it yields 1.03mR/hour with standard voltage and 0.32 mR/hour with high voltage technique. While in measuring  exposure of scattered radiation rate and back-scattered obtained result on A’ and C’ (close to anoda and side of object) and A” and C” nearly same, with highest value of 1 mR/hour and 0.93 mR/hour at standard tube voltage and at high kV technique obtained lower value of 0.29mR/hour and 0.25mR/hour.
PEMBUATAN KURVA ISODOSIS PAPARAN RADIASI DI RUANG PEMERIKSAAN INSTALASI RADIOLOGI RSUD KABUPATEN KOLAKA - SULAWESI TENGGARA Syahria, Syahria; Setiawati, Evi; Firdausi, K Sofjan
BERKALA FISIKA Vol 15, No 4 (2012): Berkala Fisika
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Abstract

t have been conducted research about the influence of distance variability betweensecondary radiation source and the determining spot to scatter  radiation exposure in theinspection room I radiology instalation RSUD Kolaka – South East Sulawes, it producted isodosecurve .This research use phantom, in the form of water in the plastic container high 40 cm andwidth 21 cm, with exposure wide 30×  40 cm. Exposure condition is given by fixed expose factor covering of tube voltage 90 kV, tube current 150 mA and exposure time 0.8 second.  Sample in this research is distance of 1 meter; 1,5 meter and 2 meter from the secondary radiation source to thedetermining spot, which measuring the scatter radiation exposure is directly conducted by thesurvey meter measuring instrument.The result of research indicates that the amount of thescattered radiation exposure will downhill progresivley to addition distance, so it can know thepoints/places that safe to the scatter radiation exposure. It can also know the maximum time limitallowed for a radiator worker in the inspection room I.Keywords : Isodose Curve ,  Phantom, Expose factor, Scatter radiation exposure.
Karakterisasi Dinamika Tingkat Tenaga Eksitasi 2Ag- Pada Karotenoid Spheroidene Menggunakan Spektroskopi Ultra Cepat Pisah Waktu Novita, Mega; Mangimbulude, Jubhar; S. Rondonuwu, Ferdy
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

Poliena adalah rantai karbon dengan ikatan rangkap dan tunggal yang saling berutan. PPP-MRD-CI mempredikasikan bahwa rantai-rantai pendek poliena memiliki struktur energi dengan tingkatan 1Ag- > 2Ag- > 1Bu+.  Waktu hidup tingkat tenaga eksitasi 2Ag- dan 1Bu+  pada poliena berada pada orde pikodetik – nanodetik tergantung pada panjang rantainya. Karotenoid sering dimodelkan sebagai rantai poliena dengan struktur energi yang sama. Paper ini membahas dinamika tingkat tenaga 2Ag- karotenoid spheroidene dalam pelarut n-hexane menggunakan spektroskopi ultra cepat pisah waktu. Didapati bahwa waktu hidup tingkat tenaga 2Ag- karotenoid spheroidene sekitar 9 pikodetik, dan sedikit bervariasi tergantung tingkat vibrasinya. Kata kunci: spheroidene, struktur energi, waktu hidup, spektroskopi
PEMBUATAN KURVA ISODOSIS 2D DENGAN MENGGUNAKAN KURVA PERCENTAGE DEPTH DOSE (PDD) DAN PROFIL DOSIS DENGAN VARIASI KEDALAMAN UNTUK TREATMENT PLANNING SYSTEM Nurul Ihya, Farhatin; Anam, Choirul; Gunawan, Vincensius
BERKALA FISIKA Vol 16, No 4 (2013): Berkala Fisika
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Abstract

Treatment Planning System (TPS) is very necessary in radiotherapy planning to give the accurate radiation dose given to the patient.  In the TPS, 2D isodose curve is used to determine thedose distribution with the same rate at a certain distance from the radiation source.  The isodosecurve is obtained from the Percentage Depth Dose (PDD) and dose profile.  Measurement data ofPDD and dose profiles obtained from Kensaras Hospital in Semarang.  The PDD and dose profiledata were obtained from testing the water phantom for soft tissues such as muscles or other bodytissues.  Dose profile curve which is used  is at a various depth, such as: 1.5 cm, 5 cm, 10 cm, 15cm, 20 cm and 25 cm with an area of 5 x 5 cm2field, 10 x 10 cm2, 15 x 15 cm2, 20 x 20 cm, 30 x 30cm2 and 40 x 40 cm2.  At each depth of curve profile, the dose at the surface is calculated  andnormalized using  interpolation and normalized by narrowing techniques. 2D isodose curveobtained from the weighting technique to the calculation of the dose profile curve. In the field sizeof 5 x 5 cm2 and 10 x 10 cm2, isodose curve formed better in the absence of horn at the edge of thecurve.  In the field size larger than 10 x 10 cm2 there are horns on the edge of the curve at thelower depths.Keywords : Treatment Planning System (TPS),  2D Isodose curve, Percentage Depth Dose (PDD),Dose profile.

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