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618  Articles
1 of 63 pages  |  10  records  |  more records»
Trata-se de uma análise critica acerca da construção histórica do processo de definição da noção de patrimônio natural no cenário do mundo ocidental, especialmente, nos contextos da Unesco e do Iphan e a necessidade de relativização dos princÃ... see more

The paper presents the simulation results of heat transfer in single-crystal lithium niobate (LiNbO3) in the form of cylinder of diameter mm and height mm in interaction with continuous-wave laser radiation with the output power of W and the wavelength of... see more

Quercetin has low solubility, absorption and bioavailability which limits its practical use as a drug or supplement. Therefore, it is important to formulate a quercetin niosome system with various concentrations of span 20 as a surfactant. This investigat... see more

Trong nghiên c?u này, linh ki?n nh?y quang vùng bu?c sóng UV nh? vào hi?u ?ng quang d?n c?a m?t s? ch?t bán d?n vùng c?m r?ng nhu titan dioxit (TiO2), niken oxit (NiO) du?c ch? t?o b?ng phuong pháp quay ph? dung d?ch. T? dó, linh ki?n du?c hoàn thành có c... see more

Semakin meningkatnya produksi biodiesel maka gliserol kasar yang merupakan produk samping dari reaksi transesterifikasi dari minyak nabati juga semakin besar. Salah satu cara yang dikembangkan untuk memanfaatkan gliserol adalah dengan mengubahnya menjadi ... see more

The deep drawing process had been widely used in automobile, aerospace, electronics, and allied industries to produce hollow parts. The quality of the deep drawing is determined by the dies properties especially their wear-resistant and hardness. Austenit... see more

NiO/silica-rich zeolite catalysts were used for coconut oil hydrocracking. The catalyst was prepared with a mixture of Na2SiO3, Al(OH)3, NaOH, and quaternary ammonium surfactants. The surfactant was varied of types like as tetrapropylammonium bromide (TPA... see more

Strontium barium niobate (SBN) is tetragonal tungsten bronze structured ferroelectric material.It is one of the few lead-free ferroelectrics in the fore-front of environment-friendly electroceramicresearch and development. The unusual sintering behaviour ... see more

The formation of the phase composition, structure, and properties of electric-arc coatings by electrode materials based on high-manganese austenite steel, which is strengthened by twinning steel alloyed by titanium and niobium carbides, was studied. Hardf... see more

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