According to the condition that brake resistor of locomotive no considering noise reduction requirements, background Rigs and status of noise research and control on the locomotive braking resistor devices were introduced.By analyzing the near-field surface sound power and spectrum of the resistor device, the main noise and frequency composition co
Telah dilakukan studi awal pembuatan dan pengolahan bahan mineral Indonesia sebagai bahan dasar pembuatan termistor NTC.Bahan mineral yarosit dari alam dimurnikan dengan larutan HCl, diendapkan dengan menggunakan NH4OH dan dipanaskan pada suhu kalsinasi 700oC selama 2 jam.Pembuatan termistor NTC dilakukan dengan mecampurkan serbuk yarosit hasil pem
BIO FATS OMEGA 3-6-9 La detección de defectos en tubos sometidos a presión interna es un aspecto poco estudiado.Unode los problemas a resolver es el modelado de los defectos, en particular los del tipo grieta cerrada.La dinámica de un tubo con un fluido interno a presión implica dificultades adicionales al problema.Se presentan los principios y
A central goal of most sustainable agriculture programs is to encourage growers to adopt practices that jointly provide economic, environmental, and social benefits.Using surveys of outreach professionals and wine grape growers, we quantify the perceived costs and benefits of sustainable viticulture practices recommended by sustainability outreach