cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
-
Contact Email
-
Phone
-
Journal Mail Official
-
Editorial Address
-
Location
Kota semarang,
Jawa tengah
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
 5   6   7   8   9 
Rancang Bangun Prototipe Alat Pres Tahu Otomatis Berbasis Mikrokontroler Sumariyah, Sumariyah
BERKALA FISIKA Vol 10, No 4 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (493.217 KB)

Abstract

An automatic tahu pressing device prototype that controlled by AT89C51 has been made. The tahu pressing is completed by  the cast with 15 cm length, 10 cm width  and  2,5 cm high. A microcontroller controlled stepper motors move used to make the desiserd shifting of the pressing thickness. One was used to move a conveyor deliver the tahu to be pressed and another to press the tahu itself. The pressing was done by setting the DL value to yield strain. Stepper motors’ step angle was reduced using a gear combination which results in a 0,270 per step. Each stepper motor yields  0,005 mm shifting of the rotating mechanics The prototype of an automatic tahu pressing device that controlled by microcontroller AT89C has done properly, that is automatically pressing tahu according desired  thickness.
KAJIAN LAHAN GAMBUT SEBAGAI CALON LOKASI/TAPAK PLTN Khusyairi, Akhmad
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 2 Tahun 2014
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (154.192 KB)

Abstract

The utilization of nuclear technology for energy will increase significantly which will supply electricity demand in the future. Geologically, Indonesia has varied condition which imply to design, operation and emergency plan. Peat lands have specific physical and chemical natures, therefore the owner should pay attention for this site to be assessed. The general potential hazard is peat lands fire during summer season which is effected by deforestation and low level of water surface, which will influence to the plants structure integrity. The assessment method which was used is literature study. Keywords: Peat lands, NPP, nuclear, electricity
PENCITRAAN RESISTIVITAS 2D BAWAH PERMUKAAN TANAMAN JATI (Tectona Grandis Sp.) MENGGUNAKAN KONFIGURASI WENNER (STUDI KASUS: LAHAN TANAMAN JATI DI BELAKANG GEDUNG MIPA UNSOED) Sehah, Sehah; Sugito, Sugito
BERKALA FISIKA Vol 14, No 1 (2011): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (671.458 KB)

Abstract

Two dimensional (2D) resistivity survey was conducted on a teak field behind the MIPA building of UNSOED, Purwokerto. The purpose of this research was to know the subsurface condition of the teak field, so that can also determine the suitability of the field to teak plant. The survey was conducted using resistivity-meter NANIURA type NRD 22S. The type of configuration was used is Wenner, with a minimum electrode spacing of two meters and maximum of ten meters. The measurement conducted for three tracks, namely LJ1, LJ2 and LJ3 with length of them self are 64 meters, 70 meters, and 40 meters, with relatively flat topography at an altitude of 110 meters above sea level. Data processing was done using RES2DINV 3.57.37 software that the result is a 2D-image of subsurface resistivity. The depth is obtained for each track is 5.37 meters. Interpretation of hydrogeology refers to local geological information. The result of interpretation is digitized using Arc-View GIS 3.3 in order to obtain final result that is hydro-geological images. The result of research show that at the LJ1 and LJ3 contain two layers of rock, there is sandy soil and clayey sand. At the LJ2 track there are three layers, sandy soil, clayey sand, and sand. The resistivity value of sandy soil is 79.4 – 193.0 Ωm, resistivity of clayey sand is 18.9 – 83.4 Ωm and resistivity of sand is 15.7 – 31.8 Ωm. The more downward tendency of resistivity value is more smaller, which indicates more water content. The results of research show that the layers of rock which is found in the land of teak is sandy soil, clayey sand and sand. According to the reference, the entire layer of rock is less than optimal to plant teak. Keywords: 2D-resistivity, land of teak plant, sub surface, Wenner configuration.
Perhitungan Kecepatan Terminal Obyek Jatuh di Udara Edi Widodo, Catur
BERKALA FISIKA Vol 9, No 4 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (164.838 KB)

Abstract

A program for determined terminal velocity of falling object in the air have been done with Python programming language version 4.2. Program was simulated interaction between massive object spheris with fluid gas (air). Program was construct by mean finite difference equation in object oriented programming Python. Object simulation is falling massive object spheris in static fluide. Input parameter is mass and radius object and viscosity  of  fluid. Output is direction and velocity of object. The result of simulation indicated the terminal velosity is depend on mass and radius of object  and viscosity of fluid.
OPTIMASI PEMBANGKIT LISTRIK TENAGA ARUS LAUT MENGGUNAKAN SISTEM TURBIN SAVONIUS TERMODIFIKASI Rahmi L, Halida; Dharmala S, Budi; Gediana, Almas; Yusup, Agus; Septria, Wenty
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 2 Tahun 2015
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (552.651 KB)

Abstract

Difficulty of access to service and installation of the electrical network in the area around a coast becomes a factor causing uneven distribution of power network. Therefore, a new prototype of Sea Flow Power Plant was prepared using a modified Savonius turbine. The modified Savonius turbine is a vertical wind turbine, which is modified into a horizontal turbine and made two pairs of turbines in different directions. Advantage of this turbine can optimally capture the come and back flows. Preparing prototype of the turbine is conducted after collecting data of the sea flow velocity surrounding Teluk Penyu - Cilacap, that is followed by manufacturing a modified Savonius turbine and prototype of PLTAL. Performance test reveals that the prototype can generate P =0,3 Watt, the velocity of turbine rotation ω = 44.42 rad/s, the turbine torque M = 0,0064 Nm and the diameter of turbine d = 0,32 m.  The sea flow velocity is often naturally changed leading to the turbine rotation change. It is found that the power and the turbine rotation increase with increasing the sea flow velocity.  At the sea flow velocity of  1,5 m/s, the prototype of PLTAL has good performance and very potential as a source of alternative electrical energy in the future. Keywords: Savonius turbine,  sea flow, electrical energy, power plant.
Studi Efek Elektrooptis Pada Minyak Goreng Widyastuti, Nina; Azam, Much; Firdausi, K. Sofjan
BERKALA FISIKA Vol 12, No 2 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (191.461 KB)

Abstract

The aim of this research is to study differences between fresh palm oil and heated palm oil in the external static electric field. The external electric field used at this research was resulted from two parallel plates of 5 × 3 cm, separated by 2.5 cm and applied by high voltage from 0 to 11 kV. Light sources used here were red laser pointer (= 650 nm) and green laser pointer (= 532 nm) to measure change of polarization angle. The heated oil used here was fresh oil that was heated in circa 16 minutes. The results indicate that fresh oil has less average gradient of electro optic polarization (h) than heated oil, both of 650 nm and 532 nm. Theh’s value is measured more significant for = 532 nm than= 650 nm, and moreover can be used to measure the quality of oils based on fresh or polluted oil.        Keywords: palm oil, electrooptic, polarization.
APLIKASI PRAKTIS MODEL IDENTIFIKASI AUTOREGRESSIVE MOVING AVERAGE EXOGENOUS (ARMAX) DENGAN METODA KUADRAT TERKECIL REKURSIF Khuriati RS, Ainie
BERKALA FISIKA Vol 14, No 4 (2011): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (396.098 KB)

Abstract

AbstractEffect on variations in power heating to air temperature in the mosquito box were modelled. Transfer function for temperature ranges from 34.93 oC to 39.93 C determinedexperimentally. A step function used to excite power control and its effect on the air temperaturemeasured. From these information, the transfer function in the ARX and ARMAX form determinedand compared. An analysis of the computational results has confirmed that the ARMAX model andthe recursive least square method are superior to the ARX model and the Extended Least Square method to model the thermal behaviour in the mosquito box as indicated by the level of fitting and system stabilitytedKeywords: Identification, prediction error method, caged mosquitoes
SINTESIS MATERIAL NANO Fe3O4 DARI KARAT BESI YANG BERPOTENSI DIAPLIKASIKAN SEBAGAI SOLAR ABSORBER PADA QUANTUM DOT SENSITIZED SOLAR CELL (QDSSC) Ma’rufah, Hani; Rohmaniah, Siti; Aripin, Muhamat; Sutanto, Heri
BERKALA FISIKA Vol 22, No 3 (2019): Berkala Fisika Vol. 22 No. 3 Tahun 2019
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (615.376 KB)

Abstract

Iron (Fe) corrosion that occurs in nature produces iron oxide (Fe3O4). The Fe3O4 has the strongest magnetic properties than in other phases such as Fe2O3. So far, Fe3O4 material from iron rust has not been widely used and further processed. If the material is made in the size of nano-meter, Fe3O4 will have ferromagnetic properties and have broad application opportunities. One of advantages is its ferromagnetic properties can absorb electromagnetic waves. High energy milling (HEM) is a physical method for making nano Fe3O4. One application of nano Fe3O4 material is as a solar absorber on quantum dot sensitized solar cell (QDSSC). In this research, the synthesis of Fe3O4 nano material from iron rust as solar absorber on QDSSC has been studied. One of the criteria of a solar absorber can be seen from the optical properties. From the scanning electron microscopy (SEM) test, it can be observed that the behavior of milling can reduce the size of the material. From the energy dispersive X-ray spectroscopy (EDS) test results, it was proven that pure synthesized material only contained Fe and O. From the X-ray diffractometer (XRD) test showed specific peaks formed were: 29.5, 350.0, 43.0, 54.0, 57.0, and 63.0. The UV-Vis test showed the band gap energy obtained was 3.3 eV.Keywords: Corrosion iron, solar absorber, QDSSC
Estimasi Ketebalan Sedimen dan Kedalaman Diskontinuitas Mohorovicic Daerah Jawa Timur dengan Analisis Power Spectrum Data Anomlai Gravitasi Dwi Indriana, Rina
BERKALA FISIKA Vol 11, No 2 (2008): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (317.159 KB)

Abstract

Gravitation anomaly research had been done to predict the depth of sediment. The gravitation research covered East Java from north coast to south coast, Indonesia. By using power spectrum method the average of sediment depth could predicted. Power spectrum method based on FFT theorem. A Short wavelength signal was correspond to narrow source and a long waveleght signal corresponds with shallow source. The power spectrum result was two discontinuities. The depth of narrow discontinuity is 2,7 km and 25,6 for the shallow continuity. The shallow discontinuity predicted as Mohorovicic layer.  Keyword: power spectrum, gravitation anomaly, discontinuity
PENGARUH VARIASI KOMPOSISI BRIKET ORGANIK TERHADAP TEMPERATUR DAN WAKTU PEMBAKARAN Tarsito, Teguh; Sutanto, Heri; Marhaendrajaya, Indras
BERKALA FISIKA Vol 16, No 1 (2013): Berkala Fisika
Publisher : BERKALA FISIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (190.569 KB)

Abstract

It has been carried out to study of influence of variation composition in organic briquetteabout temperature and duration time combustion briquette that was optimum. Briquette had made that was  briquette with composition rice hull, briquette with composition rice hull and sawdust wood rubber that mixed with glue from amylum gel. Experimental method was used in this research. Briquette sample  was burned and measured the temperature of combustion so we gained the values between temperature with combustion briquette duration time of sample briquette,briquette mass before combustion and mass residue of combustion. From the result of this researchthe conclusions can be made were the sample briquette   have  highest temperature of combustionand longest  duration time of  combustion was sample briquette with composition rice hull andwood rubber sawdust = 4 grams : 6 grams with oven  temperatur  100oC because have longestduration time combustion  over temperature  100oC with fluctuation 100°C-150°C was 12 minutes.Keywords :  briquette,  combustion calor, rice hull

Page 7 of 37 | Total Record : 366

 5   6   7   8   9 

Filter by Year

2006 2025


Reset
Filter By Issues
All Issue Vol 28, No 1 (2025): Berkala Fisika Vol 27, No 2 (2024): Berkala Fisika Vol 27, No 1 (2024): Berkala Fisika Vol 26, No 2 (2023): Berkala Fisika Vol 26, No 1 (2023): Berkala Fisika Vol 25, No 4 (2022): Berkala Fisika Vol 25, No 2 (2022): Berkala Fisika Vol 24, No 4 (2021): Berkala Fisika Vol 24, No 3 (2021): Berkala Fisika Vol 24, No 1 (2021): Berkala Fisika Vol 23, No 4 (2020): Berkala Fisika Vol 23, No 3 (2020): Berkala Fisika Vol 23, No 2 (2020): Berkala Fisika Vol 23, No 1 (2020): Berkala Fisika Vol 22, No 4 (2019): Berkala Fisika Vol. 22 No. 4 Tahun 2019 Vol 22, No 3 (2019): Berkala Fisika Vol. 22 No. 3 Tahun 2019 Vol 22, No 2 (2019): Berkala Fisika Vol. 22 No. 2 Tahun 2019 Vol 22, No 1 (2019): Berkala Fisika Vol. 22 No. 1 Tahun 2019 2015: Berkala Fisika Vol. 18 No. 4 Tahun 2015 2015: Berkala Fisika Vol. 18 No. 3 Tahun 2015 2015: Berkala Fisika Vol. 18 No. 2 Tahun 2015 2015: Berkala Fisika Vol. 18 No. 1 Tahun 2015 2014: Berkala Fisika Vol. 17 No. 4 Tahun 2014 2014: Berkala Fisika Vol. 17 No. 3 Tahun 2014 2014: Berkala Fisika Vol. 17 No. 2 Tahun 2014 2014: Berkala Fisika Vol. 17 No. 1 Tahun 2014 Vol 16, No 4 (2013): Berkala Fisika Vol 16, No 3 (2013): Berkala Fisika Vol 16, No 2 (2013): Berkala Fisika Vol 16, No 1 (2013): Berkala Fisika Vol 15, No 4 (2012): Berkala Fisika Vol 15, No 3 (2012): Berkala Fisika Vol 15, No 2 (2012): Berkala Fisika Vol 15, No 1 (2012): Berkala Fisika Vol 11, No 2 (2008): Berkala Fisika Vol 14, No 4 (2011): Berkala Fisika Vol 14, No 3 (2011): Berkala Fisika Vol 14, No 2 (2011): Berkala Fisika Vol 14, No 1 (2011): Berkala Fisika Vol 13, No 4 (2010): Berkala Fisika Vol 13, No 3 (2010): Berkala Fisika Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus Vol 13, No 2 (2010): Berkala Fisika Vol 13, No 1 (2010): Berkala Fisika Vol 12, No 4 (2009): Berkala Fisika Vol 12, No 3 (2009): Berkala Fisika Vol 12, No 2 (2009): Berkala Fisika Vol 12, No 1 (2009): Berkala Fisika Vol 11, No 4 (2008): Berkala Fisika Vol 11, No 3 (2008): Berkala Fisika Vol 11, No 1 (2008): Berkala Fisika Vol 10, No 4 (2007): Berkala Fisika Vol 10, No 3 (2007): Berkala Fisika Vol 10, No 2 (2007): Berkala Fisika Vol 10, No 1 (2007): Berkala Fisika Vol 9, No 4 (2006): Berkala Fisika Vol 9, No 3 (2006): Berkala Fisika Vol 9, No 2 (2006): Berkala Fisika Vol 9, No 1 (2006): Berkala Fisika More Issue