Search

This study is to find renewable energy solutions that can be used. Because non-renewable energy will be decrease one solution for harvesting renewable energy is to use PVDF. However, so far researchers have only used thickness polarized PVDF. Therefore, it is necessary to study the potential of PVDF with surface polarization as an energy harvester. To make PVDF with surface polarization, several steps are needed, including stretching and polarization with high voltage. The strain ratio in this study is 5.5 and the voltage for polarization is 4 KV. Polarized PVDF assembled with iron frame. This PVDF is tested with waves in the sea. The result is the average voltage produced is 1.95, electric current 0.85, and electric power 1.64. The results of this study show that PVDF with surface polarization can work well when hit by sea waves. [ABSTRACT FROM AUTHOR]

The aim of this research is to design and create a coffee pulper machine that functions to peel coffee cherry beans. The advantage of the coffee pulper machine is that there is a vibrating sieve with an adjustable frequency, by tightening or loosening the (nut) on the fibro motor as a screening between the peeled coffee beans and water mixed during the shell separation process. The design of the coffee pulper machine is based on the needs of farmers or users, which has a large capacity to increase coffee production. The research method used is data collection, coffee pulper machine design using Autodesk Inventor Software, preparation of work preparation, manufacturing process, and work testing. The application of coffee pulper machine can process all raw coffee so that there is no rotting raw coffee and then the quality of the coffee is maintained. [ABSTRACT FROM AUTHOR]