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All Journal Majalah Obat Tradisional MSI Transaction on Education
Fernando, David
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Humanities Economics, Econometrics & Finance Education Engineering Health Professions Medicine & Pharmacology Public Health Social Sciences

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Monitoring Penggunaan Daya Listrik Satu Fasa Fernando, David
MSI Transaction on Education Vol 1 No 4 (2020): MSI Transaction on Education
Publisher : Minangkabau Scholar Institute

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.46574/mted.v1i4.41

Abstract

Listrik sudah menjadi kebutuhan dasar setiap orang. Peralatan rumah tanggan dengan menggunakan listrik telah menjadi kebutuhan dasar manusia saat ini. Dibutuhkan alat monitoring agar diketahi berapa besar daya yang digunakan. Alat yang dirancang untuk memonitor ini membutuhkan sensor arus, sensor tegangan, serta arduino. Untuk pembuatan aplikasi monitoring ini menggunakan visual studio dan parameter yang diukur dapat dilihat menggunakan microsoft excel. Sensor arus yang digunakan adalah sensor SCT-013 yang berfungsi untuk mendeteksi berapa besar arus yang mengalir. Untuk sensor tegangan menggunakan sensor ZMPT101B yang berfungsi mendeteksi tegangan. Serta dibutuhkan arduino untuk mengolah data yang didapat. Hasilnya dapat ditampilkan pada PC atau laptop. Dari hasil pengujian yang didapat melalui pengukuran nilai yang didapat bisa disesuaikan melalui pengkalibrasian pada sensor arus dan sensor tegangan. Penggunaan daya pada peralatan listrik rumah tangga perlu diketahui berapa besar daya yang telah digunakan untuk mengatur pengelolaan penggunaan daya yang dioperasikan setiap harinya.
Using Macroscopic, Microscopic, and FTIR Spectroscopy combined with Chemometrics to Authenticate Arabica Coffee from Antbush Fernando, David; Santosa, Djoko; Rohman, Abdul
Majalah Obat Tradisional Vol 29, No 1 (2024)
Publisher : Faculty of Pharmacy, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/mot.85039

Abstract

Limited coffee stocks, high consumption, export demands, and increasing prices may contribute to counterfeiting. In other countries, including India and Africa, coffee forgery using antbush has been extensively established. Due to its abundance in Indonesia, unscrupulous coffee growers allegedly employ antbush (Senna occidentalis) as an adulterant in coffee to increase commercial earnings. This study aims to authenticate coffee from antbush using macroscopic and microscopic differences and FTIR spectroscopy combined with chemometrics. The arabica coffee samples from various regions were oven-roasted to a second crack and milled. The materials were then examined under macroscopic, microscopic, and infrared spectroscopic conditions. The obtained responses were used to monitor the qualitative and quantitative information in the targeted samples. Antbush in coffee samples is successfully identified microscopically by remnants of palisade tissue as well as the structural differences of the endosperm. In addition, FTIR spectroscopy combined with multivariate calibration can accurately estimate the concentration of antbush as adulterants in the target sample. Principle component regression (PCR) provides the best modeling for the relationship between the actual value. FTIR predicted the value of antbush with the lowest RMSEC and RMSEP values of 0.852 and 0.896, respectively, with the coefficient of determination (R2) in calibration and validation models of 0.9996 and 0.9967, respectively. The combination of macroscopic, microscopic, and FTIR spectroscopy offered reliable tools to authenticate arabica coffee from antbush.
Co-Authors Abdul Rohman Djoko Santosa