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Pandanus leaf (Pandanus Amaryllifolius) is one of the plants that have chemical content in the form of tannins, saponins, polyphenols (phenolics), alkaloids and flavonoids that can be used as antioxidants.The research that is done is total tannin and alkaloid test on pandan leaves. The purpose of this reseach was to determine the effect of extraction time on the amount of tannin and alkaloids in pandan leaves. In the tannin and alkaloids test, the extraction of pandan leaves was first used hydrothermal extract with 60°C temperature in 60 minutes using aquadest solvent with variation of extraction time 20, 30, 40, 50 and 60 minutes. Tannin content of 0.2%; 0.8%; 2.5%; 6.2%; 7.1% and flavonoid levels of 2.05%; 2.36%; 4.44%; 0.78%; 0.34%. From the results of reseach showed that the longer the extraction time, the more tannin content produced. While flavonoids have optimum time at 40 minute extraction time. Optimal tannin content obtained by using aquades solvent is the time of extraction for 60 minutes, while the optimum flavonoid content at the time of extraction 40 minutes.

An analysis has been carried out for the Spring Damper System using the Python programming language on Google Colab. The first stage that is carried out before the simulation is to determine the differential equation based on Newton's II law equation. The Python programming language was chosen because only needs to run in a browser, users can monitor the training process (or even coding) via a smartphone browser if the smartphone is connected to the same Google Drive. The simulation is carried out by varying the mass value from 5kg - 50kg with a mass increase range of 5kg. This is done to determine the effect of mass on changes in position and velocity/speed. Based on the simulation results, the greater the mass value given will affect the amplitude value, the position graph will increase while the velocity graph will decrease, and the time needed for both amplitudes to stabilize will increase.

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Mach Zehnder interferometer (MZI) based on plastic optical fiber (POF) is interesting due to its robustness and simple fabrication. In this work, MZI-POF was designed and its sensitivity to temperature change was characterized to investigate its performance for sensor application. The MZI-POF was fabricated by forming two tapers at several distance by simple heat-pull method. The spectra was investigated by launching white light emitting diode (LED) and the output were observed using VIS-NIR spectrometer. It is shown that the wavelength of spectrum peak and spectrum dip were shifted compared to that of un-tapered POF which indicates that the structure serves well as MZI. Sensor sensitivity to temperature was determined by measuring the spectrum for various temperature which was varied from 40°C to 80°C with increment of 5°C. The result showed that the sensor sensitivity is 0.0693nm/°C in terms of peak measurement and 0.0487nm/°C for dip measurement. Therefore, MZI-POF is a potential candidate for temperature sensor.