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You searched on: Topic Area: Chemical Analysis

Displaying records 41 to 50 of 121 records.
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41. High signal-to-noise ratio laser technique for accurate measurements of spectral line parameters
Topic: Chemical Analysis
Published: 2/9/2012
Authors: A. Cygan, D Lisak, S. Wojtewicz, J. Domyslawska, Joseph Terence Hodges, R.S. Trawinski, R. Ciurylo
Abstract: We present a new cavity-enhanced technique for the precise measurement of absorption line shape and line position. This approach, which combines high-bandwidth locking of a continuous wave probe laser with frequency-stabilized cavity ring-down spect ...

42. Measurements and Modeling Study on a High-Aromatic Diesel Fuel
Topic: Chemical Analysis
Published: 1/31/2012
Authors: Bret Windom, Marcia L Huber, Thomas J Bruno, A L Lown, C T Lira
Abstract: The increasing cost of diesel fuel, potential for supply disruptions, and environmental concerns have resulted in a great deal of research to improve the performance and efficiency of diesel engines. This includes significant efforts in the reformul ...

43. Predictive Gold Nanocluster Formation Controlled by Metal-Ligand Complexes
Topic: Chemical Analysis
Published: 1/9/2012
Authors: John M Pettibone, Jeffrey W Hudgens
Abstract: The formation of ligand-protected transition metal nanoclusters in size-selective syntheses is driven by the inherent properties of the protecting ligands. We have previously reported the selective, monodisperse product formation of phosphine protect ...

44. Comparison of Diesel Fuel Oxygenates with Composition-Explicit Distillation Curve Method Part 4: Alcohols, Aldehydes, and Butanoic Acid
Topic: Chemical Analysis
Published: 1/2/2012
Authors: Thomas J Bruno, Jessica Lynne Burger, Evgenii Baibourine
Abstract: There is a great deal of interest in formulating oxygenated diesel fuels that produce low particulate emissions. In this paper, the fourth in a series of papers on the properties of mixtures of diesel fuel with oxygenating additives, we present the ...

45. 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. ...

46. 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 ...

47. 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). ...

48. 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 ...

49. 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 ...

50. 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 Albert 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 ...

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