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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 367 Documents
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SIMULASI GERAK PARTIKEL BERMUATAN DALAM PENGARUH MEDAN LISTRIK DAN INDUKSI MAGNET MENGGUNAKAN MATLAB VERSI 7.1 Azam, Much.; Kusbramanto, Tomy; Endro Suseno, Jatmiko
BERKALA FISIKA Vol 10, No 2 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Charged particle motion under external electric, magnetic induction, and electric-magnetic induction field simulation program has been made using MATLAB ver. 7.1 to get the visual description of charged particle motion. The simulation program is made based on non relativistic Lorentz equation.  Each of charged particle’s position and velocity components, which is moved under external electric and or induction magnetic filed(s), is numerically computed using forth order Runge-Kutta method and be made visible by the simulation program. Proper test of the simulation program is made using known text book as the reference. Simulation results which made of 3D profile of charged particle’s motion path  and  each velocity components has already shown that it have good relationship with the known text book   Keywords : charged particle motion, position, velocity
RANCANG BANGUN SISTEM PENGUKURAN PERGESERAN TANAH MENGGUNAKAN SENSOR VARIABEL RESISTOR Sugito, Sugito; Hartono, Hartono; Permadi, Ipung
BERKALA FISIKA 2015: Berkala Fisika Vol. 18 No. 1 Tahun 2015
Publisher : BERKALA FISIKA

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Abstract

The phenomenon of ground motion are things that need serious attention. The impact that can be caused by the ground motion can not be underestimated. The velocity of ground motion at each area has different characteristics. Monitoring of ground motion continuously is one way to be able to determine the policy relating to protection measures. Variable resistor is a component that can be used to detect the presence of such a shift. Variable resistor connected to the shear plane using a cord will be amended proportional  with the shift in resistance value of shear plane. Variable resistor arranged with others resistor to form a Wheatstone bridge circuit. Thus the change in resistance on the variable resistor will produce a voltage change. Value of voltage changes were characterized to obtain the calibration equations, response time and stability of the sensor. Data acquisition is done by using a personal computer and the device interface DAQ NI USB6009. While programming created using LabView 7.1 software. Based on the results obtained by testing the sensor response time is very good sensor is equal to 0.47 seconds. Highly stable sensors to take measurements, look at the value of the average reading deviation of 1.14 %. The sensor has a measurement in the range of 0 to 17 cm. Keywords : variable resistor, sensor, Wheatstone bridge, characterization
Uji Nilai Tahanan Jenis Polutan Air Laut Dengan Metode Ohmik Dan Geolistrik Tahanan Jenis Skala Laboratorium Dwi Indriana, Rina; Danusaputro, Hernowo
BERKALA FISIKA Vol 9, No 3 (2006): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Geoelectric method and ohmic method used to investigate sea water intrution (salinity) in aquifer layer.Resistivity data aquisition for 3 layer model and 3 concentration of salinity was in laboratory scale. By comparing resistivity data before and after adding sea water we get resistivity value for each layer. The research result is decreasing of resistivity value for increasing salinity concentration.   
DOKUMEN PUBLIKASI ILMIAH: WARISAN YANG TAK TERNILAI HARGANYA Anam, Choirul
BERKALA FISIKA Vol 22, No 1 (2019): Berkala Fisika Vol. 22 No. 1 Tahun 2019
Publisher : BERKALA FISIKA

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Abstract

DOKUMEN PUBLIKASI ILMIAH: WARISAN YANG TAK TERNILAI HARGANYA
Rancang Bangun Detektor Gerak Menggunakan Infra Merah Dengan Memanfaatkan Layanan Sms Pada Telepon Seluler Berbasis Mikrokontroler AT89S52 Widiyatmoko, Anjar; Sumariyah, Sumariyah
BERKALA FISIKA Vol 12, No 1 (2009): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A infrared movement detector using Short Message Service based on AT89S52 microcontroller has been designed and realized. The detector can be used for monitoring any passing object in the room. This research can be used to detect up to four object in the different room. The detector was consisted one control station and one receiver station. The control station used four couple of infrared transmitter and receiver. The receiver station of mobile station was used to receive message from control station. This detector was consisted of hardware and software. The hardware was designed with infrared transmitter, an 38 kHz infrared sensor, an op-amp comparator  used to compare infrared sensor output voltage. The Transmitter emitted infrared ray and received by  sensor. Any moving object passed between them producing the output voltage of infrared receiver  change and  proceed to comparator resulting high output. This high output signal used as trigger event to running sending message procedure. And the designed software for microcontroler was written in C language. The research showed the passed object passed infrared transmitter can be detected is received and the SMS by mobile station is matched  as the location of passing object through the infrared sensor.   Keywords: Short Message Service, Microcontroller, Infrared
APLIKASI IMC BERBASIS STRATEGI PENALAAN PENGENDALI PID DIGITAL PADA SISTEM PEMANAS UDARA Khuriati RS, Ainie
BERKALA FISIKA Vol 15, No 2 (2012): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

This paper investigated  an application of the methodology that was developed by Rivera, a methodology to obtain reduced-order models that satisfy the Prett-Garcıa digital PID tuningrules, using prefiltered ARX estimation as a  basis. The  method was applicated as the temperaturecontrol system on theair heater. IMC-PID controller is not only superior but it has a simple andgeneral structure such as that of a PID controller too.Keywords:  PID digital , IMC, ARX model.
Pembuatan ADC (Analog to Digital Converter) Untuk Rancang Bangun Instrumentasi Temperatur Tinggi Menggunakan Prinsip Defleksi Laser He-Ne Sebagai Bagian Dari Sistem Kendali Operasi Di Bidang Industri Kadarisman, Nur; Sumarna, Sumarna; Rosana, Dadan
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
Publisher : BERKALA FISIKA

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Abstract

Monitoring and control all process variables such as power, temperature, and pressure is an absolute necessity in the field of industry. Instrumentation is a tool that can be used to monitor and control the process variables. From the monitoring results it can be seen whether the system is running in accordance with the desired or not. If deviation occurs, then the control action is needed so that the process can run as expected (the operating control system). One of the instrumentation equipment that need to be investigated is the use of laser deflection, because the laser beam that has a coherent nature, so that this instrumentation can be a very useful tool in the industry. At that stage the second year of this research study focused on the process input and data analysis with the aid of a microcontroller as a stage before applied in the modeling industry. The study was conducted in two stages, namely the manufacture of the ADC program that can send data voltage to the computer via RS 232 serial cable and making the ADC data acquisition software in the computer so the computer can act as a collection station, storage, and display data. This software use Borland Delphi 7. The results showed that the graph can be known voltage variations can indicate changes in certain deflection. The value of this deflection will determine the temperature of which is shown by the graph. Changes in the analog signal from the source of the potentiometer into a digital signal using ADC is inversely proportional, which is indicated by a linear graph with a correlation R = 0.99079 Graph showing the relationship between deflection with temperature according to the graph of the results of previous years of research that is done manually. Thus, further stay pending the outcome of the development of an acceptable deflection pattern detector equipped with a data acquisition system, as the final stage before implemented in the industry. Data acquisition system consists of two parts: signal conditioning systems and interfaces. If the detector is subjected by a laser beam, the optical signal is converted into electrical signals. This causes an electrical current. Because the electric current generated by the detector is very small, it needs to be strengthened and transformed into voltage by a signal conditioning system.Temperatures are measured in a particular room will cause the laser beam deflection at a certain distance so it can be used for high temperature control system.   Keywords: ADC, Instrumentation, He-Ne Laser, Borland Delphi
Rancang Bangun dan Pengujian Sistem Reaktor Plasma Lucutan Pijar Korona guna Mempercepat Pertumbuhan Tanaman Mangrove Triadyaksa, Pandji; Nur, Muhammad; Nasrudin, Nasrudin; Wasiq, J.
BERKALA FISIKA Vol 10, No 3 (2007): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Plasma glow discharge corona reactor system has been made and tested to stimulate mangrove growth. Plasma glow discharge corona reactor consists of DC high voltage system and point to plate electode system. Reactor performance test has done on Rhizophora apiculata mangrove species. High voltage system mainly develop using TV fly back that been triggered by pulsed frequency using oscillator circuit. Point to plane electrode system was designed to maintain two electrode range remains 3 cm with number of point electrode plugged parallel with plane electrode are 63 pieces. Plasma glow discharge corona reactor tested  was done on radiation process of mangrove seed by divided sample groups into 6 sample which have different time radiation and 1 sample that not been radiated as a control data. Mangrove growth was analyzed by measure the growth of mangrove plumulae after 17 days of cultivation. Research results shows that in developing plasma glow discharge corona to radiate mangrove, plasma reactor system works in 8 kV DC plasma voltage development. Mangrove growth after 6 time variation of plasma radiation shows a good effect of growth stimulation along with longer radiation time duration.  The increase of mangrove growth was hypothetically caused by an increase of nitrogen concentration in mangrove seeds because of ion nitrogen fixation in the seeds during plasma radiation process
DETEKSI ARITMIA BLOKADE CABANG BERKAS KIRI PADA ELEKTROKARDIOGRAM DENGAN JARINGAN SYARAF TIRUAN BERDASARKAN FITUR INTERVAL QR DAN RS Primadyanie, Nistya Rischa; Nuryani, Nuryani; Purwanto, Hery; Yahya, Iwan; Lestari, Anik
BERKALA FISIKA 2014: Berkala Fisika Vol. 17 No. 3 Tahun 2014
Publisher : BERKALA FISIKA

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Abstract

Left branch bundle block (LBBB) detection system have been done and tested. The system created by using Artificial Neural Network (ANN). Some ANN methods have been investigated.  Electrocardiogram features that represent the characteristic of LBBB which were QR interval and RS interval used as input. Output of the system was electrocardiogram status to detect LBBB and normal beat. LBBB detection has been done with various input with QR interval, RS interval, QR and RS interval. Detection system have been tested using chlinical data and shown that MLP method gave the best performance. Its performance shown by sensitivity, specificity, and accuracy up to 99,92%, 100%, and 99,94% . Keywords: LBBB, artificial neural network, QR interval, RS interval
MEASUREMENT OF VISCOSITY AND SUCROSE CONCENTRATION IN AQUEOUS SOLUTION USING PORTABLE BRIX METER Hidayanto, Eko; Tanabe, Teruo; Kawai, Jun
BERKALA FISIKA Vol 13, No 2 (2010): Berkala Fisika, Edisi Khusus
Publisher : BERKALA FISIKA

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Abstract

The viscosity of aqueous sucrose solution in various concentrations and the sugar content were measured by using an Ostwald viscometer and a commercial available of portable Brix meter respectively. The increasing of the concentration of sucrose would also followed by increasing viscosity of the solution. Depending on their concentration, the measured value of viscosity of solution would be automatically confirmed into the desired concentration unit. The suitability of Brix meter for other application will be checked.

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