Judul: Pembacaan KWH meter otomatis berbasis mikrokontroler menggunakan sensor infra merah
Abstrak: The customer data acquisition system used by the PLN still uses manual methods, which opens the possibilities for an error to happen. These errors is caused by the manual reading oh the KWH meter it self. And it can happen while entering the data to the database, because it were manually inputted.
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Judul: Peracangan Alat Pencatatan Pemakaian Listrik Digital
Abstrak: Penelitian ini dilakukan untuk merancang sebuah alat pencatatan pemakaian listrik (meteran listrik) digital untuk penggunaan skala kecil (rumah tangga) dengan akurasi yang diperoleh dari hasil pengujian adalah 98%. Meteran listrik ini juga memiliki kemampuan untuk berkomunikasi dalam jaringan karena meteran listrik memiliki fitur device addressing yang memungkinkan pembedaan antara meteran listrik yang satu dengan yang lainya. Selain itu, meteran listrik juga dapat berkomunikasi dengan PC (Personal Computer) melalui komunikasi serial dengan interface RS232 melalui aplikasi software yang telah dibuat dalam penelitian ini. Variabel listrik yang dapat dibaca oleh meteran listrik ini adalah akumulasi pemakaian energy, tegangan RMS, arus RMS, daya aktif, daya reaktif, daya total, faktor daya, dan frekuensi.
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Judul: Extraction and Characteristic of Collagen and Nanoparticle Collagen from the Skin of Stingray Fish (Pastinachus solocirostris) as Ingredient of Cosmetics.
Abstrak: Isolation of collagen from the skin of stingray fish (Pastinachus solocirostris) has been successfully conducted with three stages: first soaked in 0.05 M NaOH with a sample/solution ratio of 1:10 (w/v) for 6 hour, second soaked in 0.1 M acetic acid with a sample/solution ratio of 1:6 (w/v) for 2 hour, and third extraction with destilated water at temperature 40 C for 2 hour with a yield of 14.475 % (wet base). Nanoparticle collagen was made with desolvation method using etanol as a desolvating agent with a collagen solution/etanol ratio of 1:1. Yield of nanoparticle collagen was 9.64% (wet base) with particle size of 185.24 nm. Collagen and nanoparticle collagen is in the form of white powder with whiteness degree 72.48% and 60.03%, respectively. Protein is the major component in collagen and nanoparticle collagen (86.97% and 86.18%) with trace amount of ash (0.17% and 0.13%) and fat (0.19% and 0.25%), respectively. Based on sodium dodecyl sulfate-polyacrylamide gel electrophoresis patterns, amino acid composition, and fourier transform infrared (FTIR) spectra of both collagen and nanoparticle collagen were characterized as type I collagens. Nanostructural analysis of collagen and nanoparticle collagen by Scanning Electron Microscopy (SEM) shows that both were separate aggregates. Other characteristics of collagen and nanoparticle collagen were: Tmax of 165.88 C and 156.63 C; Viscosity 292.33 cP dan 110 cP; pH 5.00 dan 4.93; respectively. Collagen has highest solubility at pH 7 and the isoelectric point at pH 6, 9, and 10. Therefore, nanoparticle collagen has highest solubility at pH 3 dan and the isoelectric point at pH 6. Collagen and nanoparticle collagen from skin of stingray fish (Pastinachus solocirostris) has a characteristic for a potential use as a cosmetic ingredient.
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