Biodiesel is often blended with regular U.S. No. 2 diesel. The blending level influences engine performance, emissions, and fuel cold‐flow properties. In this article, ultraviolet (UV) absorption spectroscopy is presented as a reliable and affordable technology for blend level detection based on the absorbance patterns of the aromatic compounds in the proposed spectrum. Blends of biodiesel from...

The Mark I Data Processor is a system for acquiring, processing, and printing, without the aid of a computer, the results of analyses carried out in Fast Analyzers. Because it is inexpensive and portable, this system is particularly applicable for use with the newly developed miniature Fast Analyzer. It uses digital logic to correlate the signals originating at the photodetector of the analyzer...

VUV absorbance and index of refraction data for a series of linear and cyclic alkanes have been collected in order to understand the relationship between the electronic excitation wavelength (or absorbance edge), index of refraction, and molecular structure. The absorbance edge and index for a homologous series of both linear and cyclic alkanes increase with increasing carbon number. The optica...

The absorbance at 450 mJ.Lof serum diluted with acidified ethylene glycol is used as a measure of the serum’s total bilirubin content in a single-tube, single-extraction method for rapid determination of free and total bilirubin in 0.1 ml. of serum. With the addition of chloroform, free bilirubin is extracted into the chloroform but conjugated bilirubin remains in the ethylene glycol. Free bili...

This paper proposes an optical method which allows determination of the organic compound concentration in water by measurement of the UV (ultraviolet) absorption at a wavelength of 250 nm~300 nm. The UV absorbance was analyzed by means of a multiple linear regression model for estimation of the total organic carbon contents in water, which showed a close correlation with the UV absorbance, demo...

The effects of N-methylphenazonium methosulfate (PMS) have been compared with three other phenazine dyes and N, N, N’, N’-tetramethyl-&phenylenediamine (TMPD). All accelerate the recovery of the initial absorbance changes in Rhodospirillum rubrum extracts induced by a lO+ec flash, although only N-ethylphenazonium ethosulfate and TMPD stimulate photophosphorylation to the same extent as PMS. N-E...

-..''Conversion' of absorbance unit into molar amount was tried as to deoxydinucleotide, In order to achieve rhis trial, a reversedphase high-performance liquid chromatographic method with a linear gradient mode was established for separation and quantification of deoxymononucleotides and deoxynucleosides. Selecting 2'-deoxycytidylyl-(3'-5')thymidylic (5') acid as an example of deoxydinucleotid...

Strong optical absorbance makes topological insulator (TI) surfaces a promising high-performance photodetector in the terahertz (THz) to infrared frequency range. Here, we study the optical absorbance of more realistic TI films with hexagonal warping effect using the Fermi's golden rules. It was found that when the warping term is λ ≠ 0, the absorbance is no longer a universal value as that of ...

Blue light-induced absorbance changes were measured from differentially centrifuged membrane fractions from dark-grown coleoptiles of Zea mays L., and mycelia from an albino mutant of Neurospora crassa. Actinic irradiation caused changes in absorbance consistent with a flavinmediated reduction of a b-type cytochrome. Both corn and Neurospora showed similar light-minus-dark difference spectra, d...

The effects of N-methylphenazonium methosulfate (PMS) have been compared with three other phenazine dyes and N, N, N’, N’-tetramethyl-&phenylenediamine (TMPD). All accelerate the recovery of the initial absorbance changes in Rhodospirillum rubrum extracts induced by a lO+ec flash, although only N-ethylphenazonium ethosulfate and TMPD stimulate photophosphorylation to the same extent as PMS. N-E...