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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 30 Documents
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Search results for , issue "Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus" : 30 Documents clear
Model Pembelajaran Untuk Meningkatkan Keterampilan Proses Ipa-Asesmen Dan Pembelajaran Tematik Calon Guru Sekolah Dasar Siahaan, Parsaoran; Liliasari, Liliasari
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
Publisher : BERKALA FISIKA

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Abstract

This research is part of a series of research and development to improve the mastery learning model of prospective elementary school teachers in science and pembelajarannya.Model learning concepts developed in this research is the learning model that integrates two different courses are semester courses the concept of science and science education. Scenario learning is done in four phases, namely: (1). Modeling phase, (2) phase of discussion, (3). Enrichment phase, and (4) peer learning phase. The study was conducted on students of teacher candidates in two PGSD who take shelter in the Indonesian Education University of PGSD X sekota with the University and PGSD Y berdomosili in other cities within the same province.Subjects consisted of 25 students in PGSD X prospective teachers and 26 student teacher candidates at PGSD Y. The material consists of three pairs of research topics Magnet-Process Skills Science, Electrical-assessment in learning science and food-Thematic Learning. The research instrument used in the form of multiple choice tests and Description. Analysis of data using <g> dinormalisir gain from Hake. Research shows <g> PGSD X student teacher candidates related to science process skills and assessment including the classification was 0.57 ± 0.10 and high classification in thematic learning that is equal to 0.70 ± 0.14, whereas <g> student-teacher candidates PGSD Y including the classification is to Skills Assessment Process science and is equal to 0.68 ± 0.07, and medium for learning thematic classification that is equal to 0.53 ± 0.20. From <g> acquisition can be concluded that student teacher candidates PGSD PGSD Y better than X in Science Process Skills - Assessment, but lower in the Thematic learning.   Key words: learning model, prospective teachers, science process skills, assessment, thematic.
Penentuan Gaya Tolak Menolak Magnet Antar Dua Magnet Permanet Menggunakan Metode Kesetimbangan Benda Asih Nugroho, Kuncoro
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
Publisher : BERKALA FISIKA

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Abstract

Use of magnets vary in life. Use of magnets depending on needs. Magnets can be used from the side: the field is generated, attractive force and repel force between the two magnets. Special utilizing repel forces magnetic one used on the railways to reduce the friction between wheel and rail.One way to determine the amount of repel force magnet is to use the object equilibrium. Two similar magnetic poles will repel. Large repulsion force depends on magnetic field (B) accrued and distance (r) the two magnets. Two magnets with similar poles are placed in the shell will give rise to vertical distance between the magnets to each other.  There is a balance between the repulsive magnetic force with the gravity due to the mass of the magnet when the magnet above the rest. Magnetic repulsive force can be determined for certain r by changing the magnetic mass. Large magnetic gravity on each r can be computed from the gravity due to the magnetic mass.   Keywords: repel force, gravity
Pengembangan Sistem Pengukuran Gejala Fisis Longsor Sistem Elektronik Dan Optik Widiyatmoko, Bambang; Hanto, Dwi; Puranto, Prabowo
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

Landslides are a common disaster in Indonesia so that the necessary anticipation through the monitoring of areas prone to the development of instrumentation systems disaster. Design has been done measuring the physical symptoms of landslides using optical and electronic systems. Measured physical symptoms include a shift in soil, and soil strains. Shift in the electronic ground sensors made by using linear and potensio constan current source. The result of measurement is known that this sensor can detect a shift change of 0.5 mm with a maximum shift of 250 mm. Soil strain measured using a fiber optic brag grating (FBG), which changes the transmission peak of FBG was done by using the diode laser wavelength sweeping. Fiber brag grating is an optical sensor that works according to the resonant effect of a refractive index grating lattice, where the resonant wavelength is determined by the lattice distance. From this principle it is when the lattice spacing change due to the strain and temperature changes, the peak resonant wavelength will also change. Changes in the resonant peaks are measured to determine the strain or temperature measurement. measurement Simulation showed that the relationship between strain and change in peak wavelength is linear with slope (Δλ / ΔF) 1.41 nm / kNewton. Keywords: Extensometer, linear potentiometers, fiber Brag grating, landslides, system monitoring, disaster  
Membangun Filter Berdasarkan Model Amblesan dan Dinamika Muka Air Tanah Untuk Memisahkan Sumber Anomali Gaya Berat Mikro Antar Waktu Supriyadi, Supriyadi
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

Filter has been fabricated based on the model of microgravity two sources of anomalies over time, ie subsidence and groundwater level dynamics. Model adjusted for field conditions with several assumptions, one of which is the porosity of the aquifer consists of homogeneous sand and clay sand is 30% filled with water.  Gravity response due to subsidence, soil water dynamics and combined the two done 2D FFT. FFT process is changing the data from the spatial region to region frekuensi. Furthermore, the filter is built by performing mathematical operations division, which is output divided by input. The output data of the gravity response due to subsidence or ground water dynamics, and input is combined response and the dynamics of gravity due to subsidence of ground water. Experimental results show that in order to create a filter that gives a small error when using filters subsidence dimensional (XY) of the same or greater dimension of subsidence are filtered. Differences dimensional subsidence subsidence filter with a filter at X = 100 m and Y = 100 m gives 1.744% error. Giving a small error when using filters subsidence dimension (Z) the same or smaller dimensions are filtered subsidence. Differences dimensional subsidence subsidence filter with a filter of 1 cm gives 7.322% error. For the case of subsidence of more than one location indicates that the smallest error occurs if you use the filters subsidence dimension equal to - average dimensions of subsidence to be filtered.   Keywords: filter, subsidence, groundwater
Uji Sifat Listrik Film Tipis LiTao3 dan LiTaFe2O3 Indro, M. N.; Sastri, B.; Nady, L.; Ridwan, E.; Syafutra, H.; Irzaman, Irzaman; Siswadi, Siswadi
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

Lithium Tantalat (LiTaO3) pure and LF Thin films has been done is cube-shaped Ferium Oxide Fe2O3 (LFT) with a cube-shaped variation 0%, 2.5%, 5% and 7.5% above the substrate Si (100) p-type using a chemical solution deposition (CSD) method  by spin coating technique at 3000 rpm rotational speed for 30 seconds. LF Thin films made with 1 M concentration and annealing at a temperature of 850 ° C for Si substrates. Thin films on p-type silicon substrates were characterized thickness using volumetric method, characterization conductance by using LCR meter, test the current-voltage characterization (IV curve) using Keithley Meter IV model 2400, characterization of dielectric constants and time constants using the oscilloscope and function generator and pyroelectric characterization using Wetsteind bridge circuit which in furnace (combustion) to a temperature of 1300C by calculating the increase in temperature variation. From the characterization results indicate thickness thickness increases with the number pendadah ferium given oxide. IV characterization results showed that LF and LFT thin film is a dielectric resistor.Hasil are contained in a thin film on p-type silicon substrate varies in accordance with the addition pendadah used were 0%, 2.5%, 5% and 7.5%.  Keywords: LF, LFT, thin film, CSD, spin coating, annealing, cube-shaped, thickness, dielectric constant, time constant-voltage current, ferium oxides, pyroelectric. 
Konsep Massa Ekonomis Sebagai Ukuran Kelembaman Pelaku Ekonomi Dalam Ruang Harga (Kajian Mekanika Kuantum Dalam Ekonomi Mikro) Rifai, Bachtiar; Palupi, Dwi Satya; Rosyid, Muhammad Farchani
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

This paper has studied the correlation of economic systems in the market for goods by using the concept of state and the concept of observable in quantum mechanics.Also proposed the concept of economical mass as an economic actor counterparts concept of inertia or inertia in physics. Studied the things that determine the mass of a principal economic economical. Discussed the possibility of applying the model to market goods with commodities and M N economic actors using the concept of Quantum Many Body Problem. Keywords: Ekonofisika, Applied Physics, Massa economical, Quantum many-body problem
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
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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
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
Optimasi Prototipe Turbin Angin Menggunakan Metode Conjugate Gradient Bilalodin, Bilalodin; Sugito, Sugito
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

One of the principal issue of energy conversion from wind energy to electrical energy is the optimization of its conversion process. Energy conversion is called optimum if the power lost is  minimum. The condition can be attained at the development stage of a wind turbine prototype.  This research will determine the optimum value the  variables of  various operation condition by using  multivariables Conjugate Gradient (CG) optimization algorithm. It is found that the optimum value is attained at  H = 1,0 m and D = 0,6 m, hence minimum power lost. The performance of turbine prototype design at laboratory, showed that the turbine can testing at low and high wind speed and   the irrespective of wind direction condition.    Keywords :  optimalization, prototype, wind turbin, conjugate gradient  
Cover Edisi Khusus, Vol. 13, No. 2, April 2010 April 2010, Cover Edisi Khusus
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

Cover Edisi Khusus, Vol. 13, No. 2, April 2010

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