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Displaying records 41 to 50 of 159 records.
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41. Compressed-Liquid Density Measurements of Methyl Oleate and Methyl Linoleate
Topic: Chemical Analysis
Published: 9/30/2011
Author: Stephanie L Outcalt
Abstract: Compressed liquid densities of the fatty acid methyl esters methyl linoleate and methyl oleate have been measured with a vibrating-tube densimeter. The temperature and pressure range of the measured data is from 270 K to 470 K, and 0.5 MPa to 50 MPa. ...

42. Assessment of the Composition and Distillation Properties of Thermally Stressed RP-1 and RP-2: Application to Fuel Regenerative Cooling
Topic: Chemical Analysis
Published: 9/28/2011
Authors: Bret Windom, Thomas J Bruno
Abstract: In this work, we measured the volatility of thermally stressed samples of RP-1 and RP-2 rocket kerosenes by use of the advanced distillation curve method. This work is part of a large program at NIST and other laboratories geared toward improving th ...

43. Characterization of Renewable Fuels and Additives with the Advanced Distillation Curve Method
Topic: Chemical Analysis
Published: 8/28/2011
Authors: Thomas J Bruno, Tara M Lovestead, Bret Windom
Abstract: The analysis of complex fluids such as fuels poses significant challenges arising primarily from the multiplicity of components, the different properties of the components (polarity, polarizability, etc) and matrix properties (such as dirty samples). ...

44. Trace Detection and Quantitation of Hydrogen Peroxide Permeation through Polymer Barriers
Series: NIST Interagency/Internal Report (NISTIR)
Topic: Chemical Analysis
Published: 8/1/2011
Authors: Tara M Lovestead, Thomas J Bruno
Abstract: In this paper, a novel apparatus and fluorescence detection method for measuring the permeation of H^d2^O^d2^ through polymer barriers (i.e., plastic bottles, caps, and containers) is presented. Measurements were performed with 35 and 50 % (mass/mas ...

45. Detecting Gravesoil from Headspace Analysis with Adsorption on Short Porous Layer Open Tubular (PLOT) Columns
Topic: Chemical Analysis
Published: 7/23/2011
Authors: Tara M Lovestead, Thomas J Bruno
Abstract: Victims of crimes are often buried in clandestine graves. There are several techniques for finding buried bodies or the scattered remains of a victim; however, none of these methods are very reliable or work in all scenarios. One way to detect grav ...

46. Biosynthetic origin of the 3-amino-2,5,7,8-tetrahydroxy-10-methylundecanoic acid moiety and absolute configuration of pahayokolides A and B
Topic: Chemical Analysis
Published: 6/8/2011
Authors: Li Liu, Daniel W Bearden, Kathleen S. Rein
Abstract: Pahayokolide A is a cyclic undecapeptide from the cyanobacterium Lyngbya sp. The absolute configurations of the amino acids of pahayokolide A have been determined. Pahayokolide A contains the unusual α-hydroxy-β-amino acid, 3-amino-2,5,7, ...

47. Effect of oxidation on surface-enhanced Raman scattering activity of silver nanoparticles: a quantitative correlation
Topic: Chemical Analysis
Published: 6/6/2011
Authors: Yun Han, Robert Lupitskyy, Tseng-Ming Chou, Christopher M Stafford, Henry Du, Svetlana Sukhishvili
Abstract: The effect of silver oxidation on surface-enhanced Raman scattering (SERS) was investigated using citrate-reduced silver nanoparticles (Ag NPs) (45-50 nm in diameter) immobilized on glass substrate. Oxidation of Ag NPs was performed in controlled ozo ...

48. Development of Standard Reference Materials for the Analysis of Dietary Supplements: The Story Continues
Topic: Chemical Analysis
Published: 5/19/2011
Authors: Katherine E Sharpless, Lane C Sander, Stephen A Wise, A. NguyenPho, J. M. Betz
Abstract: In 2004, we published an article in HerbalGram that described a collaboration among the National Institute of Standards and Technology (NIST), the National Institutes of Health, Office of Dietary Supplements (NIH-ODS), and the Food and Drug Administr ...

49. Comparison of Diesel Fuel Oxygenate Additives with Composition-Explicit Distillation Curve Method Part 3: t-Butyl Glycerols
Topic: Chemical Analysis
Published: 5/2/2011
Authors: Tara M Lovestead, Thomas J Bruno
Abstract: Interest in the domestic production of all fuels, sparked by the high cost of petroleum crude oil, has led to consideration of fluids to replace or extend conventional petroleum-derived fuels. There is particular interest in formulating oxygenated d ...

50. Comparison of Diesel Fuel Oxygenates with Composition-Explicit Distillation Curve Method Part 1: Linear Compounds with One to Three Oxygens
Topic: Chemical Analysis
Published: 5/2/2011
Authors: Thomas J Bruno, Tara M Lovestead, Jennifer Riggs, Erica Jorgensen, Marcia L Huber
Abstract: There is a great deal of interest in formulating oxygenated diesel fuels that produce low particulate emissions. The most common oxygenating additives for diesel fuels include the glycol ethers, glycol esters, alcohols, ethers and ketones. It is im ...

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