thesIt » wavelength http://lakm.us/thesit computer science research log in semi microbloging style Tue, 24 Aug 2010 21:34:55 +0000 http://wordpress.org/?v=2.9 en hourly 1 Use of a spectrophotometer for biodiesel … http://lakm.us/thesit/174/use-of-a-spectrophotometer-for-biodiesel/ http://lakm.us/thesit/174/use-of-a-spectrophotometer-for-biodiesel/#comments Thu, 07 Jan 2010 04:15:08 +0000 Arif http://xp-racy.lan/s2/?p=174 Use of a spectrophotometer for biodiesel quality sensing.
Paper number 053133, 2005 ASAE Annual Meeting. Artur Zawadzki, Dev Shrestha, Brian He.

The test procedures to assure ASTM biodiesel quality are not being widely implemented because of the lengthy procedures and laboratory equipment requirements. A critical need in the increasingly emerging biodiesel industry right now is a reliable, affordable and rapid test method for determining the blends of biodiesel in diesel fuel. As an effort to explore a reliable and rapid method, a spectrophotometer was used to scan the blends of #2 fossil diesel and biodiesel for spectrums in the wavelength range of 190-1100 nm.

The shape of the spectrum curve was found to be different for different biodiesel feedstock where as relative absorbance and characteristic peaks of absorbance curve was attenuated with increasing amount of diesel in the blend. Shape characteristics were fed into neural network to predict the biodiesel feedstock and blend level in biodiesel-diesel mixture.

http://asae.frymulti.com/abstract.asp?aid=19829&t=2

]]> http://lakm.us/thesit/174/use-of-a-spectrophotometer-for-biodiesel/feed/ 0 Spectral measurements were made with an … http://lakm.us/thesit/104/spectral-measurements-were-made-with-an/ http://lakm.us/thesit/104/spectral-measurements-were-made-with-an/#comments Fri, 25 Dec 2009 14:28:43 +0000 Arif http://xp-racy.lan/s2/?p=104 Spectral measurements were made with an ultraviolet-visible spectrophotometer (Varian-Cary Win UV 100). For each concentration, buffer solution were added. The solution was then diluted to the mark. The absorbance spectra of the complex solution were recorded from 350 to 700 nm. A total of 24 spectra reading were obtained. 5 were used to test the network whilst the remaining 19 were used for the training.

]]> http://lakm.us/thesit/104/spectral-measurements-were-made-with-an/feed/ 0 Spectrophotometric Determination of Cati … http://lakm.us/thesit/32/spectrophotometric-determination-of-cati/ http://lakm.us/thesit/32/spectrophotometric-determination-of-cati/#comments Sun, 20 Dec 2009 08:37:45 +0000 Arif http://xp-racy.lan/s2/?p=32 Spectrophotometric Determination of Cationic and Anionic Surfactants with Anionic Dyes in the Presence of Nonionic Surfactants, Part I: A General Aspect
Shoji Motomizu, Mitsuko Oshima, and Yasuhiro Hosoi. Mikrochim Acta 106, 57-66 (1992)
…The addition of alcohols, organic onium ions, anionic surfactants and nonionic surfactants brought about a decrease of the band at wavelengths near 480 nm and an increase of the band at wavelengths near 420 nm. Such a shift toward the shorter wavelengths in spectra was attributed to the change of the micro-environment around the dyes from a polar field to a less polar field…

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