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INDONESIA
BERKALA FISIKA
Published by Universitas Diponegoro
ISSN : -     EISSN : -     DOI : -
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.
Arjuna Subject : -
Articles 366 Documents
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Penerapan Pendekatan Modified Free Inquiry Sebagai Upaya Meningkatkan Kreativitas Mahasiswa Calon Guru Dalam Mengembangkan Jenis Eksperimen Dan Pemahaman Terhadap Materi Fisika Khanafiyah, Siti; Rusilowati, Ani
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
Publisher : BERKALA FISIKA

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Abstract

This study aimed to enhance students' creativity in developing the kinds of experiments and understanding of materials physics, especially wave, with application of the modified approach to free inquiry in the department of Physics, State UNNES. The instrument used a questionnaire to measure creativity, observation sheet to measure the ability psikhomotorik and sheets test to measure the understanding of matter waves. Results were analyzed using a Likert scale questionnaire. Normalized gain formula is used to test the effectiveness of modified free inquiry approach in enhancing students' creativity and understanding of the matter wave. The results showed that the application of modified free inquiry approach that gives freedom to the students to develop creativity, to (1) improve the ability psikhomotorik students, (2) type of experiment, developed into more varied, (3) enhance student creativity, and (4) increase cognitive abilities of students. Keywords: modified free inquiry, creativity
Kajian Efisiensi dan Karakterisasi Produksi Ozon dengan Lucutan Plasma Berpenghalang Dielektrik (DBDP) untuk Pengendalian Jamur dalam Beras Rachman, Dian Arif; Nur, Muhammad; Kusdiyantini, Endang
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014
Publisher : BERKALA FISIKA

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Abstract

A research about the influence of ozone on fungi  which living on rice type mentik that used natrium agar (TPC methode) media has done.  The research was done at normal temperature and the outside air pressure with free air as a source of ozone. The ozone concentration of 2.91 up to 3.19 ppm was radiated on 7 differnet samples of rice, each sample 50 gram used ozonized  time variation 0 minutes, 30 minutes, 60 minutes, 90 minutes, 120 minutes, 150 minutes and 180 minutes. It was obtained results the number of fungi that died of 97,3 % after ozone irradiated for 30 minutes and 99,2% after 60 minutes. Total number of fungi which has dead during 150 minutes as much 99,9 %. Characterization of ozone conducted using ozone reactor (Dielectric Barrier Discharge Plasma). variation in the voltage and the rate of air flow was performed to obtain the optimum concentration of ozone. Voltage variation started from 6 kV, 6 kV, 8 kV and 6 kV whereas variation of oxygen flow rate of 0.5 L/min, 1 L/min, 2 L/min and 3 L/minute. The results obtained with the same tendency which is that at the same voltage, the higher the air flow rate and declining concentrations of ozone. On the study for flow rate of 0.5 L/min the ozone concentrations was obtained 4.6 up to 6.8 ppm. While for flow rate of 3 L/minute ozone concentrations was obtained 2.9 up to  4.8 ppm. Keywords: fungi, natrium agar, irradiate, reactor
Pengaruh Penggunaan Cermin Datar Dalam Ruang Tertutup Pada Sel Surya Silikon Sidopekso, Satwiko; Yumanda, Vony
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika
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Abstract

Efforts to optimize the electrical output of solar modules by maximizing the intensity of light that falls onto the surface of solar modules using a flat mirror (mirror room). The results obtained revealed that there is increasing output of solar modules. Value of Isc, Voc and the highest P consecutive outs in the amount of amperage 2:13; 20.483 35.34 volts and watts. While the value of Isc, Voc and the highest P out without a mirror room which was 0.78 amperes, respectively; 19.24 volts and 12 watts. Percentage increase in solar module output power can reach 64.22%, the highest efficiency solar module to the mirror room of 13.47% by using low lamp power.   Keywords: Solar Module; Electric Output Optimalization; Mirror Room 
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] Nur, Muhammad; Setiari, Nintya; Azam, Much.; Selawanti, Ika Indah
BERKALA FISIKA Vol 10, No 1 (2007): 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.
UJI HASIL KINERJA MESIN PENGOLAH FILM OTOMATIS MINI MEDICAL Raharjo, Oky Didik; Azam, Much.; Ketut Umiati, Ngurah Ayu
BERKALA FISIKA Vol 9, No 2 (2006): 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
PENGUKURAN PERMITIVITAS KOMPLEKS MATERIAL MAGNETIK MENGGUNAKAN METODE S-PARAMETER DENGAN PENDEKATAN NICOLSON ROSE-WEIR Priyono, Priyono; Abidin, Nur; Nurhasanah, Iis
BERKALA FISIKA Vol 22, No 2 (2019): Berkala Fisika Vol. 22 No. 2 Tahun 2019
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Abstract

Dielectric properties of material are important properties because it describes the interaction of material with electromagnetic waves. The complex permittivity value of material is interesting because it can represent on how much energy savings and dissipation when the material gets exposed to electromagnetic waves. The aim of this paper was to determine complex permittivity by Nicolson-Ross-Weir (NWR) method. The NWR method was based on the phenomenon of reflection and transmission of electromagnetic wave that drip on materials. The values of the reflection coefficient () and the transmission coefficient (T) were derived from reflection (S11) and transmission (S12) parameters. Determination of real permittivity in the frequency range of 10 GHz to 15 GHz of BaFe12O19 material was ε ’ = 4.36 and ε ” = 6.23. The second sample was BaFe9 (MnCo)1,5Ti1,5O19, the values of ε ’ = 5.49, while ε ” = 9.35. From the two test materials, it was revealed that in the frequency range of 10 GHz to 15 GHz, absorption did not occur in BaFe12O19, while in BaFe9 (MnCo)1.5Ti1,5O19 absorption occured at 13.0 GHz.Keywords: Ferromagnetic, S-parameter, complek permittivity
Cover Oktober 2008 Oktober 2008, Cover
BERKALA FISIKA Vol 11, No 4 (2008): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Cover Berkala Fisika 2008
IDENTIFIKASI DAN PERANCANGAN PENGENDALI PID MENGGUNAKAN PENDUGA ARX TERHADAP SISTEM PEMANAS UDARA DENGAN KRITERIA ISE, IAE, ITSE DAN ITAE Khuriati RS, Ainie
BERKALA FISIKA Vol 15, No 4 (2012): Berkala Fisika
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Abstract

In this paper ARX estimation methodology used to design a PID controller  for  temperature control of the air heater. The step input applied  on heating systems and logging the data   to MATLAB via a data acquisition system. The data obtained is used to identify the model ofthe process in the form of ARX estimator. PID parameters obtained by minimising the  standard errors integral(IAE, ISE, ITSE and ITAE).Keywords: PID controller, Tuning, ARX Identication, Error Integral ,and air heater
Tungku Sekam Sebagai Bahan Bakar Alternatif Pada Sterilasasi Media Jamur Tiram Puspita, R. D.; Desna, Desna; Husin, A.D.; Irzaman, Irzaman; Darmasetiawan, H.; Siswadi, Siswadi
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

Medium Sterilization which has been packaged in the baglog on the oyster mushroom cultivation, one of them can be done with a steam technique using the drum. Commonly used fuel is firewood that could be assisted by using coal or kerosene or LPG gas. Rice husk as alternative fuel of kerosene and firewood can be used as fuel for the medium sterilization. The husk which used in the sterilization process of oyster mushrooms medium for 6 hours, 8 hours, and 10 hours as much as 55.5 kg, 60 kg and 67 kg. The efficiency which obtained in the medium sterilization of oyster mushrooms with using rice husk is reached 45.23% in the medium sterilization for 8 hours.   Keywords: Medium, oyster mushrooms, rice husk, sterilization
RANCANG BANGUN ALAT UKUR KEKERUHAN AIR BERBASIS MIKROKONTROLER Eka Nuzula, Nike; Endarko, Endarko
BERKALA FISIKA Vol 16, No 4 (2013): Berkala Fisika
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Abstract

Turbidity meter based on microcontroller has succesfully been designed and fabricated. The photodiode as sensor and a LED as light source were used for measuring level of waterturbidity whereas microcontroller ATMega 8535 was used for data processing. The turbidity levelof water is measured based on Nephelometer method. The LED and photodiode detector were positioned parallel to each other at a distance of 2 inches. The measurement results indicated that the turbidity meter could be used to measure the turbidity level of water in the range 0 – 200 NTUand the maximum of standard deviation was at 1.33 NTU.Keywords : Turbidity, NTU, Photodiod, LED, Nephelometer

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