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All Journal ILMU KELAUTAN: Indonesian Journal of Marine Sciences BULETIN OSEANOGRAFI MARINA BERKALA FISIKA SAINS DAN MATEMATIKA YOUNGSTER PHYSICS JOURNAL
Indras Marhaendrajaya
Physics Department, Faculty Of Sciences And Mathematics, Diponegoro University
Earth & Planetary Sciences Mathematics Physics

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Journal : BERKALA FISIKA

 1   2 
Studi Pengaruh Medan Radio Frekuensi (RF) pada Minyak Goreng Firdausi, K. Sofjan; Istianah, Istianah; Marhaendrajaya, Indras
BERKALA FISIKA Vol 11, No 1 (2008): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

A study of non linier optic has been carried out for palm oil induced by RF frequency field,e using white light and laser light. The e’s value is produced by RF generator with 2kV of voltage and in the range of frequency between 6.04 MHz and 11 MHz. In this research, he-ne laser with 632.8 nm of wavelength, green pointer laser with 532 nm of wavelength and white light of halogen with maximum power 130, are used as source of light. The physical characteristics observed in the experiment are change of light polarization that is transmitted through palm oil. From experiment result indicates that the change of polarization angle is not linearly dependent on e, At the same condition, the highest changes of polarization angle takes place when providing green laser, upright position of RF frequency field on polarization angle direction  900 for the twice used-palm oil. Keywords: non – linier optics, polarization angle, RF frequency field
KOMPARASI ENTRANCE SURFACE AIR KERMA (ESAK) DENGAN SOFTWARE CALDOSE_X DAN METODE TUBE OUTPUT PADA PASIEN THORAX DEWASA DALAM PEMERIKSAAN RADIOGRAFI UMUM BERDASARKAN DATA SI-INTAN Anugrah Rahma Ari Wiganti; Eko Hidayanto; Indras Marhaendrajaya; Pandji Triadyaksa
BERKALA FISIKA Vol 25, No 4 (2022): Berkala Fisika
Publisher : BERKALA FISIKA

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Kuantitas  operasional  dosimetri  didasarkan  pada  pengukuran  Entrance  Surface  Air  Kerma (ESAK),  baik  secara  langsung  dengan  thermoluminescence  dosimeter  (TLD)  maupun  tidak langsung dengan memanfaatkan keluaran radiasi pesawat sinar-X.  Namun, CALDose_X dan juga  metode  Tube  Output  mampu  melakukan  perhitungan  dosis  menggunakan  persamaan standar.  Penelitian  ini  bertujuan  untuk  menghitung  ESAK  pada  pemeriksaan  Thorax  radiografi umum  proyeksi  Anterior  Posterior  (AP)  dan  Posterior  Anterior  (PA)  berdasarkan  data  SI- INTAN  dengan  perangkat  lunak  CALDose_X  dan  metode  tube  output  serta  menganalisis perhitungan  ESAK  tersebut  dengan  nilai  Diagnostic  Reference  Level  (DRL).  Data  penelitian bersumber  pada  basis  data  SI-INTAN  Bapeten  yang  berupa  data  survei  pasien  dan  data  keluaran radiasi pada salah satu rumah sakit di Jawa Timur yaitu sebanyak 76 data proyeksi AP dan 111 data proyeksi  PA.  Data  diolah  menggunakan  CALDose_X  dan  metode  tube  output  serta  diuji menggunakan uji normalitas dan uji Wilcoxon. ESAK pada pemeriksaan thorax dewasa radiografi umum rumah sakit X proyeksi AP dengan CALDose_X sebesar 0,34±0,055 mGy dan metode tube  output  sebesar  0,33±0,059  mGy.  Sedangkan  proyeksi  PA  dengan  Caldose-X  yaitu sebesar  0,31±0,13  dan  metode  tube  output  sebesar  0,30±0,13  mGy.  ESAK  pemeriksaan Thorax  di  rumah  sakit  X  pada  CALDose_X  menunjukkan  tidak  ada  perbedaan  yang signifikan dengan metode tube output dan nilainya lebih rendah daripada DRL Indonesia.
PEMBUATAN DAN PENGUJIAN PROTOTIPE DESALINASI BERTENAGA SURYA YANG DIKOMBINASIKAN DENGAN LAMPU ULTRAVIOLET DAN SISTEM OTOMATIS BERBASIS MIKROKONTROLER Rosyad, Muhammad Sabilul; Marhaendrajaya, Indras; Sutanto, Heri
BERKALA FISIKA Vol 27, No 1 (2024): Berkala Fisika
Publisher : BERKALA FISIKA

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Abstract

The lack of availability of clean water quantitatively is due to 97% of the water on earth is sea water, with a salt content of seawater of around 35000 mg/L causing the water to be unable to be used directly without prior treatment. One of the efforts that can be done to overcome the clean water crisis is through seawater desalination to produce water with low salinity. Several desalination methods that have existed are MSF (Multi Stage Flash Distillation) and Reverse Osmosis. But both of these methods have a high cost. Therefore, we need a method that is cheaper and easier to implement such as distillation. In this research, seawater desalination process uses the distillation method combined with a vacuum pump, electric stove and ultraviolet lamp. The use of a vacuum pump in the distillation system can speed up the evaporation process of seawater. Ultraviolet lamps function to degrade heavy metal pollutants and remove harmful bacteria. To maximize the performance of the tool, an electric stove with an automation system is added with solar panels as its energy source. Analysis of the tests carried out included the construction of the prototype, characterization and calibration of the LDR (Light Dependent Resistor) sensor and Arduino UNO microcontroller, total energy production and use, water production speed, and water quality. The results obtained include a prototype of seawater desalination. The characterization and calibration of the sensor in the automated system that the LDR sensor is running accurately, together with the Arduino UNO microcontroller, the LDR sensor can be an automation system that can make the prototype turn on and off automatically. The use of ultraviolet lamps shows that ultraviolet lamps have a photon energy of 3.0 eV and are able to work in visible light. The use of solar panels as an energy source can make an energy efficient prototype. This tool technology can increase water productivity up to 2 times and water quality shows a decrease in several pollutant parameters in distilled water including TDS (Total Dissolve Solid) of 99.7%, electrical conductivity of 99.987%, salinity of 99.93% , total coliform was 100%, and heavy metals Pb was 82.47%, Cd was 60.33%, Cu was 100%, Fe was 96.1%, Cr was 90.33%, and Zn was 98.9% , and the pH of seawater became neutral from 7.5 to 6.9. This prototype technology has the potential to be applied to the community.
Co-Authors Agung Cahyono Agus Subagio Agustina Setyaningsih Annisa Fadillah Anugrah Rahma Ari Wiganti Arinar Rosyidah Eko Hidayanto Eko Sugiyanto Evi Setiawati Hadi Endrawati Hari Wibowo Heri Sutanto Hermin Pancasakti Kusumaningrum Imam Misbach Istianah Istianah K. Sofjan Firdausi K. Sofjan Firduasi Kristantyo Sukarsono Muhammad Iskandar Zulkarnain Muhammad Zainuri Pandji Triadyaksa Priyono Priyono Rahmadi Setyawan Respita Sulistyo Riyani Riyani Robertus Triaji Mahendrajaya Rosyad, Muhammad Sabilul Sulistyo Sulistyo Sulung Edy Nugroho Teguh Tarsito Vincensius Gunawan S.K. Wahyu Dewi Utari Haryanti Widianingsih Widianingsih Yuvita Muliastuti Zaenal Arifin