Vol. 4 No. 2 (2019): SPEKTRA: Jurnal Fisika dan Aplikasinya, Volume 4 Issue 2, August 2019

SPEKTRA Volume 4 issue 2 contains 6 papers: 1) The Spring Variation in Two Dimensional Modeling Of Red Blood Cell Deformability Based on Granular; 2) Optimization of The Use of Fly Ash Is An Additive Portland Composite Cement (PCC); 3) Fluidization of A Bed of Solid Particles In A Two Dimensional Vertical Box; 4) Fruit Sweetness Characterization Using Impedance Spectroscopy Method; 5) Biosensor System Design for Dissolved Oxygen Measurement Using Current Mirror Circuit; 6) Multi-Channel Fry Counter Design Using Optocoupler Sensor.