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Daftar accepted manuscript:

  

Audio Bio Harmonic with WT5001 Smartchipusing Solar Cell

Author(s): Nur Kadarisman, Fitria Ayu Sulistiani, Wipsar Sunu Brams Dwandaru, Rhyko Irawan Wisnuwijaya, dan Agus Sugiarto

ABSTRAK: The design of audio bio harmonic (ABH) with smartchip WT5001 using solar cell technology in the form of ABH instrumentation with an electricity resource derived from solar energy has been successfully created and tested, which includes (i) testing the peak frequency of sound and sound output, and (ii) emptying and charging tests to determine the effectiveness of the use of the solar cell as the power provider. The ABH system consists of (i) a sound generator device composed of WT5001 sound modules, amplifiers, and horn speakers, and (ii) structured power supply devices for solar cell modules, charger controllers, and batteries for storing power. The test results of the peak frequency for the insect (garengpung) sound files and the output sound of the ABH device indicate a deviation of peak frequency of 13.46 Hz to140.81 Hz. The 15 hours emptying test results in on mode with battery charging for 7 hours shows that the use of 10Wp solar cell is effective to provide electrical powerin ABH tool operation.


 

The synthesis of TiO2 nanoparticles powder by Milling and Coprecipitation Mixed Method

Author(s): Maya Puspitasari Izaak, Yohanes Edi Gunanto, dan Henni Sitompul

ABSTRAK:Ilmenite type Fe2O3 waste (which is processed from natural iron sand) was processed into TiO2 nanoparticles powder carried out by leaching with HCl and then using high-energy milling (HEM) for 50 hours. The characteristics of the powder such as particle size, size distribution and phases were analyzed using various techniques such as XRD, SEM, EDS and particle size analyzer. Synthesis and characterization of ilmenite type iron sand have been successfully made into TiO2 by milling and coprecipitation mixed method. The purity level of TiO2 was obtained by 85.01%. Particle size of TiO2 was approximately 500 nm.

 


 

 

 



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