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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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PEMBUATAN PEMANAS INDUCTION UNTUK SISTENSIS MATERIAL DENGAN MOTODA HIDROTERMAL Nurkholis, Nurkholis; Bawono, Ari; Priyono, Priyono
BERKALA FISIKA Vol 23, No 2 (2020): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

Induction heaters furnace could work faster and more efficiently compared to the conventional electric heaters, but a temperature regulation system should be quite good and stable with a fairly long operating time. This method is suitable for the synthesis of materials that require a long operation time, such as hydrothermal process. This study aims to design and evaluate the induction heater using K-type thermocouple sensor with proportional Integral Derivative (PID) control system. Thermocouple sensors calibration tested on a set point of 150 °C to 350 °C gives a good result at stable temperature values after tested less than 90 seconds and have low error rates at 0,02% - 0,16%.  Hydrothermal synthesis process on reactor with a heating temperature of 300 °C for 24 hours gives a good result.
PENGARUH RASIO GRID TERHADAP KUALITAS RADIOGRAF FANTOM KEPALA Priyono, Setyo; Anam, Choirul; Budi, Wahyu Setia
BERKALA FISIKA Vol 23, No 1 (2020): Berkala Fisika
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Abstract

This study aims to determine the effect of the grid ratio on the quality of the radiographic examination of a head phantom. The study was conducted by using grid ratios of 5:1, 6:1, and 8:1, the head phantom. The focus-film distance (FFD) was 100 cm. In the antero-posterior projection used voltages of 70, 75, and 80 kVp with a current-time of 25 mAs, while in the lateral projection using voltages of 65, 70 and 75 kVp with a current-time of 20 mAs. The densities of radiographs were measured using a densitometer. Measurement was repeated in 10 locations. The contrast of radiograph was calculated as the difference between adjacent density values. The results showed that the higher level of the grid ratio would lower the density of radiograph, however it does not always give effect to the increase or decrease the contrast of radiographs. It was found that the optimal quality radiographs in antero-posterior projection at a grid ratio of 6:1 for tube voltage of 75 kVp with a current-time of 25 mAs, and in the lateral projections at a grid ratio of 5:1 grid for tube voltage of 75 kVp with a currenttime of 20 mAs.
ANALISIS NILAI COMPUTED TOMOGRAPHY DOSE INDEX (CTDI) PHANTOM KEPALA MENGGUNAKAN CT DOSE PROFILER DENGAN VARIASI PITCH Sari, Devi Artika; Setiawati, Evi; Arifin, Zaenal
BERKALA FISIKA Vol 23, No 2 (2020): Berkala Fisika
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Abstract

The purpose of this study was to measure the value of computed tomography dose index (CTDI) using the CT dose profiler, to compare the values of CTDI obtained in the five holes within the head of polymethil-methacrylate (PMMA) phantom, and to analyze the effect of pitch on CTDI values. The CTDI values were measured with the pitch variations of 0.562, 0.938, 1.375, and 1.750. The phantom was scanned with fixed parameters of 120 kVp, 200 mAs, 10 mm width collimation, 150 mm scan length, and 0.50 s tube rotation. Measurements were conducted at Kensaras hospital using the CT scannner of GE Optima CT580 16 slice. The results showed that if the pitch increases, the CTDI will decrease (< 25 mGy). The highest CTDI is 55,36 mGy and it is found on a pitch of 0,562 at upper hole of phantom (B position), and the lowest CTDI is 11,9 mGy and it is found a pitch of pitch 1,750 within a hole at three o’clock position (C position). If the pitch < 1, then the high CTDI is obtained (> 50 mGy) and it takes longer to scan.
ELECTROOPTIC CHARACTERISTICS OF COLLOIDAL SILVER SOLUTIONS USING TRANSVERSE ELECTROMAGNETIC MODE OF INCOMING LIGHT Firdausi, K. Sofjan; Setyoningrum, Aqilatul F.D.; Tiwiyaningsih, Tiwiyaningsih; Rahmawati, Aidah; Richardina, Very; Khumaeni, Ali; Sugito, Heri; Soesanto, Qidir M.B; Azam, Much
BERKALA FISIKA Vol 23, No 3 (2020): Berkala Fisika
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Abstract

In this paper, we demonstrated new electro-optics characteristics of silver nanoparticle solution (NPP) using  linear  light  polarization.  The  electro-optical  properties  of  NPP  solution  were  obtained  by measuring changes in the polarization of light in the transverse electromagnetic (TEM) mode, in which the  source  light  is  made  linearly  polarized  at  0˚  and  90˚to  the  axis  of  polarizer.  NPP  samples  were obtained by laser ablation method and electro-optical properties were obtained through high voltage DC 0-9 kV with light source from green laser pointer (532 nm). The results showed that colloidal silver solution  in water  at  an angle  mode  of  0˚,  strongly  suspected  to  show  active  Plasmon  resonance at a concentration area of 3-5 ppm, with a peak of polarization at a concentration of 4.6 ppm. In the 90˚ mode, it is assumed that the colloidal silver solution is resonant inactive, the change in polarization is caused  only  by  a  combination  of  natural  polarization  and  electro-optical  polarization.  The  study  of changes in the polarization of light through electro-optical effects on silver solutions is very interesting to  be developed  further  using other  particles,  because  it  can provide  a  more  comprehensive  answer. This method also contributes science to the new  perspective of understanding the interaction of light with matter, especially colloidal silver solutions, and the like.Keywords: Light polarization, electro-optics effect, colloidal silver solution 
APLIKASI MODUL SENSOR CAHAYA GY-302 BH1750 DAN SENSOR JARAK ULTRASONIK HC-SR04 PADA EKSPERIMEN FOTOMETER BERBASIS MIKROKONTROLER ARDUINO UNO Muryani, Sri; Sumariyah, Sumariyah
BERKALA FISIKA Vol 23, No 4 (2020): Berkala Fisika
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Abstract

This  study  aims  to  implement  the  GY-302  BH1750  light  sensor  module  and  the  HC-SR04 ultrasonic proximity sensor to determine the illumination of the test lamp and distance in an Arduino Uno-based photometer experiment.  There were aluminum rail with a total length of 100 cm and the sensor rail with length of 80 cm in the mechanical device of this photometer, while the sensor was made from acrylic. The working principle of this photometer experiment tool began with a DC motor that puts the sensor at the initial state near the limit switch 1. The sensor measured the illumination and distance to display on the LCD. The motor moved the sensor  away  from  the  lamp  and the  sensor  stopped  every  5  cm  change in  distance,  then  the sensor detected the distance and illuminates in which their values were displayed on the LCD. The motor returned to the limit switch 1 when it hits at the limit switch 2 of the limit finish. The average error value of the ultrasonic sensor calibration was 1.35% with the correlation value of 0.9997. Meanwhile the average error value of the light sensor calibration was 3.39% with the  correlation  value  of  0.9867.  The  results  of  this  photometer  experiment  showed  that  the intensity of the yellow, clear, red, and blue lights are 7.91, 6.42, 2.10, and 0.49 Cd with error values of 15.66, 11.61, 9.12, and 7.34% and the correlation values of 0.9954, 0.9983, 0.9987, 0.9981, respectively.Keywords: Photometer, light sensor, proximity sensor 
ANALISIS POTENSI TANAH LONGSOR DI PADANGSARI BANYUMANIK SEMARANG Setyawan, Agus; Putra, Hisbicus Dwi Surya; Suseno, Jatmiko Endro; Yulianto, Tony
BERKALA FISIKA Vol 23, No 3 (2020): Berkala Fisika
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Abstract

Semarang city is a city that grew out of old settlement built on alluvial sediment. The conditions cause many natural disasters such as floods and landslides. Padangsari Village, Banyumanik District located in the Southern part with hilly morphology and lithology from Mount.Ungaran. Positive  potential  is  the  existences  of  material  for  development  that  are  useful  for  the community, otherwise the negative potential there is soil vulnerability than can cause landslide. Classification of positive and negative potentials is obtained from combining several data and factor  such  as:  rainfall,  slope,  groundwater  level,  lithology,  sedimentation  and  landuse.  All data were processed with ArcGis softwere and produces a potential map for the Padangsari Village. Hopefully the map will be useful for research and society in Padangsari to produce policy when infrastructure development.Keywords:  Landuse,  landslide,  rainfall,  slope,  groundwater  level,  lithology,  sedimentation, Padangsari
SKEPTIS DALAM SAINS Nur, Muhammad
BERKALA FISIKA Vol 23, No 3 (2020): Berkala Fisika
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Abstract

“For my first work-related tweet of 2020, I am  totally  bummed  to  announce  that  we have  retracted  last  year's  paper  on enzymatic  synthesis  of  beta-lactams.  The work  has  not  been  reproducible.”  Itulah tweet dari peraih hadiah Nobel 2018 bidang Kimia.  Dia  harus  mengumumkan  sesuatu yang  mungkin  tak  disangka  sebelumnya. Ahli sekaliber Frances H. Arnold terpaksa mengumumkan  bahwa  sintesis  enzimatik beta-laktam  (enzymatic  synthesis  of  beta- lactams)  belum  dapat  direproduksi (diulangi).
SISTEM OTOMATISASI DAN KENDALI JARAK JAUH LAMPU SMART HOUSE BERBASIS NODEMCU ESP8266 Ningrum, Febri Sintia; Triadyaksa, Pandji
BERKALA FISIKA Vol 23, No 4 (2020): Berkala Fisika
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Abstract

Internet of Things (IoT) is a concept that aims to expand the benefits of continuously connected internet connectivity. This research aims to utilize IoT on home remote control and automates systems that can be operated with a smart phone application via an internet connection (WiFi). This system used the NodeMCU ESP8266 module as a microcontroller, the light emitting diode (LDR)  sensor  as  an  automation  controller  for  lighting  the  environment  according  to environmental conditions, and the Blynk smartphone application as a remote controller. The process of controlling the lights can be done specifically on certain lights and can be controlled by  the  changes  of  environmental  light  in  the  morning  and  evening.  The  results  showed  that when the LDR sensor was poorly lit, the lamp would be ON and otherwise the lamp would be OFF when the LDR receives more light intensity. In addition, the Blynk application is able to control the lights when connected with internet and tested, in this research, up to 2.7 km. It can be concluded that as long as the system is connected to the WiFi in a stable and continuous manner,  then  this  control  system  can  perform  the  task  of  turning  on  and  off  the  lights independently when the owner is not at home.Keywords: Internet of Things (IoT), Blynk, LDR, Smart House, NodeMCU ESP6288 
JENIS UJI STATISTIK UNTUK ANALISIS HASIL PENELITIAN Anam, Choirul
BERKALA FISIKA Vol 23, No 4 (2020): Berkala Fisika
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Abstract

Dalam penelitian, seorang peneliti dituntut unutuk melakukan penelitian yang memiliki kebaruan  (novelty).  Untuk  itu,  peneliti sering  kali  mengusulkan  metode  atau pendekatan  baru  untuk  penyelesaian  suatu permasalahan.  Terhadap  metode  atau pendekatan  baru  yang  diusulkan,  peneliti harus menguji secara komprehensif metode yang  diusulkan,  apakah  memberikan  hasil yang  secara  signifikan  berbeda  dengan metode  sebelumnya  atau  tidak.  Dalam  hal ini, peneliti tidak boleh sekedar mengklaim atau  menyimpulkan  hasil  penelitiannya secara  subyektif.  Misalnya,  dengan melaporkan  bahwa  hasil  yang  diperoleh secara  signifikan  lebih  baik  dibanding metode atau pendekatan sebelumnya.
ANALISIS PERMUKAAN NANOPARTIKEL FERIT SENG BERDASARKAN ADSORPSI ISOTERM GAS NITROGEN Kadarisman, Kadarisman; Nurhasanah, Iis
BERKALA FISIKA Vol 23, No 3 (2020): Berkala Fisika
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Abstract

This research aims to analyze surface characteristic of zinc ferrite nanoparticles based on the N2 adsorption isotherm. The morphology and size of zinc ferrite nanoparticles were observed using a scanning electron microscope. Analysis of N2 adsorption isotherm using the Brunauer- Emmett-Teller  equation  obtained  a  specific  surface  area  of  9.78  m2/g  and  mesoporous structure.    Zinc  ferrite  nanoparticles  were  composed  of  spherical  primary  particles  with  a diameter  of  67  nm.  The  size  of  the  nanoparticles  obtained  from  the  specific  surface  area analysis was greater than the scanning electron microscope image analysis. This finding shows that zinc ferrite nanoparticles are agglomerating to form larger secondary particles.Keywords: Zinc ferrite, nanoparticle, surface area, agglomeration 

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