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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 369 Documents
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Optimasi Tungku Sekam Skala Industri Kecil Dengan Sistem Boiler Nawafi, F; Puspita, D; Desna, Desna; Irzaman, Irzaman
BERKALA FISIKA Vol 13, No 3 (2010): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Rice husk furnace  is a technology based on local wisdom to anticipate threats crisis energy. At first investigated husk stoves for cooking only in the scale of the household, but today rice husk furnace developed for industrial scale because of the importance of commercial aspects of a very promising from this rice husk furnace. In rice husk furnace also developed an industrial scale boiler system, boiler systems where it can enlarge its efficiency, in the midst of a boiler chimney pots have used, because basically rice husk furnace process is influenced by air flow. Husk furnace efficiency greatly affect the number of furnace ash which is required in the cooking process.   Keywords: rice husk, rice husk furnaces, air flow, efficiency, boilers.
ANALISIS GUGUS FUNGSI PADA SAMPEL UJI, BENSIN DAN SPIRITUS MENGGUNAKAN METODE SPEKTROSKOPI FTIR Anam, Choirul; Sirojudin, Sirojudin; Firdausi, K. Sofjan
BERKALA FISIKA Vol 10, No 2 (2007): Berkala Fisika
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Abstract

An analysis of functional groups using FTIR (Fourier Transform Infra Red) spectroscopy in test samples, such as petroleum and spiritus compound has been done.The spectral of the functional groups is observed by comparing of the absorption band which is formed on infra red spectrum with the infra red lines standard and comparing with other known compound. It is expected that functional group identification can be done effectively.Infra red spectrums of petroleum show the group of methyl (CH3), alkenes and aromatic compound. That results analysis is supported by appearance of bending symmetric vibration of C-H and the presence of stretching vibration of C=C from aromatic ring. The spiritus spectrums show the group of hydroxyl from alcohol compound. That analysis is supported by appearance of wide band on 3500–3000 cm-1 and appearance of band on 1000–1100 cm-1.  While test sample spectrum show the group of hidroksil (O-H) from primary alcohol, group of metil (CH3), triple bond (C≡C–H), group of nitril (R–C≡N), double bond (C=C) and C-N.   Keyword: FTIR spectroscopy, vibration, infra red spectrum, absorption, functional group
IDENTIFIKASI FOKUS MIKROSKOP DIGITAL MENGGUNAKAN METODE OTSU Putranto, Ari Bawono; Adi, Kusworo; Gernowo, Rahmat
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 4 Tahun 2014
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Abstract

A study to identify focus on a digital microscope has been done using a threshold value of the object microscope image obtained by Otsu method. Microscope image of the object captured by the change from a maximum to a minimum distance between the object and the microscope objective lens to record the amount of movement of a motor stepper and calculates the Otsu threshold value on each image. Based on data from a Otsu threshold value of each microscope image of the object to the changes within the object can be inferred the existence of a relationship between the position of an object to focus the microscope with the image of the threshold value that is increasingly the focus of an image , the image of the Otsu threshold values ​​obtained are also getting smaller. In this study done by testing two samples as objects of microscope that single hair samples and samples collection of several hairs were each placed on a microscope glass slide. Data collection and observation results show that for a single hair samples obtained object focus Otsu threshold value T = 97 and sample an object consisting of a collection of some of the hair is obtained Otsu threshold value T = 127. But the testing of two samples showed differences influenced by the ratio between the number of pixels on the image and the background image of an object caused by the influence of the intensity of the light source of the microscope. Keywords: Focus Identification, Digital Microscope, Otsu Threshold
Pemanfaatan Teknik Lissajous untuk Mengetahui Korelasi antara Kandungan Air terhadap Sifat Dielektrik Tanah (Studi Kasus: Sampel Tanah Permukaan di Sekitar Kota Purwokerto) Sehah, Sehah; Nur Aziz, Abdullah; Irayani, Zaroh
BERKALA FISIKA Vol 12, No 3 (2009): Berkala Fisika
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Abstract

The equipment has been designed to measure the dielectric properties of soil samples with lissajous technique in Basic Physics Laboratory, Study Program of Physics, Faculty of Science and Engineering, University of Jenderal Sudirman, Purwokerto. The equipment has been used to measure the dielectric constant of 19 soil samples taken from several locations in area of Purwokerto city and its surrounding, at a frequency of 100 kHz. The measurement has been conducted on soil samples with the variation of soil mass water content. The results obtained indicate, the existence of a correlation between the dielectric constant of soil samples to the soil water mass content (h) which can be expressed with two equations; dielectric permittivity e = 0.3176 h-2.5555 with a correlation coefficient R2 = 0.9538, and dielectric loss equation e'= 0.00003 h -5.3336 with a correlation coefficient R2 = 0.9513.
Penggambaran Pseudosection Bawah Permukaan dari Suatu Proses Evapotranspirasi Tanaman Jagung Menggunakan Program RES2DINV Suroso, Teguh; Yulianto, Tony; Yulianto, Gatot
BERKALA FISIKA Vol 9, No 3 (2006): Berkala Fisika
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Abstract

The dipole-dipole investigation of one line corn crop subsurface condition have been done in relationship with evapotranspiration process. The variation of subsurface resistivity investigation occured by the caused of evapotranspiration process.The space of dipole-dipole array measured in 0,20 meter and 0,40 meter with n value  from 1 to 4. In May 21st,24th,28th,31st 2005 the dipole-dipole array was measured. The electrodes and  corn crop-line  possition is parallel. The depiction of subsurface condition viewed by using the Res2Dinv apparent resistivity data. The depiction showed the high resistivity of the corn crop area and the transpiration process is higher than evaporation process. Anomaly resistivity value in the pseudosection output  is 54,30 Wm. Keywords: dipole-dipole, evapotranspiration, resistivity
PEMBUATAN SISTEM KENDALI POSISI AUTOFOKUS EKSPERIMEN LENSA DENGAN MOTOR LANGKAH Gunadi, Isnain; Gernowo, Rahmat; Adi, Kusworo
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 4 Tahun 2015
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Abstract

The automatic lens experiment with stepper motor position control has been made. Main component of this device are stepper motor which move the lens and screen. Microcontroller is contens the programs of motor movement controller. The screen contain of Light Dependent Resistor (LDR) as voltage sensor. This image will focused when the voltage in the screen is maximum. The result of test show that the automatic measurement is more accurate than manual measurement.Keywords: Auto-Fokus, LDR, IPMC, LSW, EAPs, VCM
Cover Januari 2009 Januari 2009, Cover
BERKALA FISIKA Vol 12, No 1 (2009): Berkala Fisika
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Abstract

Cover Berkala Fisika Januari 2009
PERUBAHAN BUTIR DAN PENENTUAN TEMPERATUR PEMBENTUKAN BARIUM HEXAFERRITE TERSUBSTITUSI ION Mn+2 Dan Ti+4 MELALUI MEKANISME MEKANIKA MILLING Priyono, Priyono; Manaf, A
BERKALA FISIKA Vol 15, No 2 (2012): Berkala Fisika
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Abstract

Abstract Ferrite as magnetic material has been exploited for various the application for exampleas electronic peripherals and optic like hard magnetic also soft magnetic materials. For theapplication of high frequency usually exploited as circulator, phase shifter and absorber and antidetection material. In research has been done synthesis and characterization of sewer structuresnanocristall barium phase hexaferrite substitution is partial with ion Manganese and Titaniumthrough mechanics engineering alloy. Indicated that monophase formation of Barium Hexaferriteis substitution by Mn+2 and Ti+4 happened at growth temperature above 7500 C. At low relativetemperature 5000 C and 750 0 C , 8500 C and 10000 C  result of plant from mechanics processalloy is not happened formation of phase, but only experiences recrystallization to returnfollowed with magnification growth of grain its. Above heating 7500 C plant grain desisted andhappened orthogonal transformation of off the cuff phase towards formation of bariumhexaferrite substitution by Mn+2 and Ti+4 ions. In research is not found existence of intermediatephase during formation of the phaseKeywords: recrystalization, high frequency, intermediate phase, ferrites
Model Panel Surya Cerdas Dengan Sensor Pelacak Cahaya Matahari Otomatis Berbasis Mikrokontroler Harjunowibowo, Dewanto
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
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Abstract

This research aims to create a model of intelligent solar panels are able to follow the movement direction of the sun as an energy source based on microcontroller AVR ATMEGA. This study uses ATMEGA AVR microcontroller 16bit with injection of fuzzy logic programs. The system also created using 4 (four) sensors LDR and 5 (five) photodiode sensor. Integration of fuzzy logic, AVR ATMEGA and sensors capable of providing optimal results into a dynamic model of the solar panels that automatically and can be applied on a large scale. The results of this study is a prototype solar panel that is able to follow the movement direction of the sun based on microcontroller AVR ATMEGA 16. The solar panels model is capable of putting solar panel surface perpendicular to the direction of sunlight intensity can be detected along the sensor.   Keywords: smart panel, microcontroller, fuzzy logic, sensor
PERHITUNGAN ANALITIK PEMECAHAN SPIN RASHBA PADA QUANTUM DOT GaAs DALAM POTENSIAL PARABOLIK DUA DIMENSI Tri Cahyanto, Wahyu; Hidayanto, Eko
BERKALA FISIKA Vol 16, No 2 (2013): Berkala Fisika
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Abstract

Analytical calculation of Rashba spin-splitting on the GaAs-based quantum dots in the twodimensionalparabolic confinement. It has been investigated the spin splitting due to the Zeeman effectand a Rashba-type spin-orbit coupling on a disk-like GaAs-based quantum dot. Calculations weredone analytically considering the influence of an external magnetic field applied perpendicularly tothe dot. The result shows that spin-orbit interaction causes a “crossing” on the electron energy statesin the dot with the same angular momentum and different spin polarizations in a nonzero magneticfield. The calculated magnitudes of spin splitting and magnetic fields at the crossing level can be usedto discuss more realistic quantum dots model theoretically on the further research.Keywords: Rashba spin-orbit coupling, GaAs-based quantum dots, crossing levels

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