Judul: Analisis unjuk kerja pengontrolan tinggi muka air pada sistem irigasi otomatis menggunakan perangkat berbasis mikrokontroler
Abstrak: Perubahan iklim global dan perubahan pola hujan yang terjadi menyebabkan cuaca sulit di prediksi sehingga menimbulkan ketidakpastian ketersediaan air. Karena itu perlu dicari teknologi yang dapat meningkatkan efisiensi pemberian air irigasi. Pada perkembangan ilmu dan teknologi saat ini, kontrol otomatis memiliki peranan yang penting dalam memberikan kemudahan untuk mendapatkan performansi pada sistem dinamik. Kontrol otomatis dapat mempertinggi laju produksi, meniadakan pekerjaan-pekerjaan rutin dan membosankan yang harus dilakukan operator. Perangkat kontrol otomatis bermacam-macam jenisnya. Smartdatalog merupakan sebuah perangkat data loger otomatis berbasis mikrokontroler yang juga memiliki fungsi kontrol otomatis. Perangkat dapat berfungsi sebagai pengontrol dan pengambil data kemudian menyimpannya sehingga dapat digunakan untuk memonitor pergerakan tinggi muka air tanah pada lahan.
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Judul: Rancangan dan Uji Coba Otomatisasi Irigasi Kendi.
Abstrak: Development of science and technology today make automatic control have important role. It gives us ease to get performance in dynamic system. Automatic control be able to less routine work that operator always do. Automatic control tools have many kinds. Microcontroller ATMega328P is a kind of automatic control. The function is control and record data then save it. Automatic pitcher irrigation system constructions consist on hardware and software. Hardware consist on water level sensor and soil moisture sensor series, microcontroller, stackable SD card shield, real time clock, relay, battery and solenoid valve. Software is a program for microcontroller that used C/C++ language. Each sensor will be calibrated before use. Daily high water level and soil moisture data was data obtained. The data was obtained each 5 minutes. Data in microcontroller was obtained by record data on memory that was set in microcontroller. Calibration results express that microcontroller capability in monitoring high water level and soil moisture has high accuracy. Determination Coefficient calibration equation from the sensor is 0.955 for high water level sensor and 0.887 for soil moisture sensor. Furthermore, set point for control high water level is 5 cm for bottom margin and 14 cm for top margin.
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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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