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Topic Area: Chemical Analysis

Displaying records 71 to 80 of 155 records.
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71. Composition-Explicit Distillation Curves for Mixtures of Gasoline and Diesel Fuel with {gamma}-Valerolactone
Topic: Chemical Analysis
Published: 3/23/2010
Authors: Thomas J Bruno, Arron Wolk, Alexander Naydich
Abstract: Interest in the domestic production of bio-derived fuels, sparked by the high cost of petroleum crude oil, the potential of supply disruptions, and fears about climate change has lead to consideration of fluids to replace or extend conventional petro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=904915

72. Uncertainties in Electron Probe Microanalysis
Topic: Chemical Analysis
Published: 3/12/2010
Authors: Ryna B. Marinenko, Stefan D Leigh
Abstract: This tutorial discusses the importance of citing valid uncertainties when reporting analytical results and the need for a universally accepted approach for evaluating uncertainties. Today, the CIPM procedure has been accepted by numerous internation ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902270

73. The Composition Explicit Distillation Curve Technique: Relating Chemical Analysis and Physical Properties of Complex Fluids
Topic: Chemical Analysis
Published: 11/17/2009
Authors: Thomas J Bruno, Lisa S. Ott, Tara M Lovestead, Marcia L Huber
Abstract: The analysis of complex fluids such as crude oils, fuels, vegetable oils and mixed waste streams poses significant challenges arising primarily from the multiplicity of components, the different properties of the components (polarity, polarizability, ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903548

74. Effect of RP-1 Compositional Variability on Thermophysical Properties
Topic: Chemical Analysis
Published: 10/6/2009
Authors: Marcia L Huber, Eric W Lemmon, Thomas J Bruno
Abstract: We compare experimental and predicted thermophysical properties of two samples of rocket propellant RP-1 obtained from different batches of RP-1 that exhibit compositional variations. One sample is atypical, due to a high olefin content. The effect o ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902380

75. Spectrum Simulation in DTSA-II
Report Number: 832430
Topic: Chemical Analysis
Published: 10/1/2009
Author: Nicholas W m Ritchie
Abstract: Spectrum simulation is a useful practical and pedagogical tool. Particularly with complex samples or trace constituents, a simulation can help to understand the limits of the technique and how to optimize the tools for the optimal measurement. DTSA- ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832430

76. Thermal Decomposition Kinetics of Kerosene-based Rocket Propellants. 1. Comparison of RP-1 and RP-2
Topic: Chemical Analysis
Published: 9/11/2009
Authors: Jason A Widegren, Thomas J Bruno
Abstract: The decomposition kinetics of the kerosene-based rocket propellants RP-1 and RP-2 was studied. For RP-2, decomposition reactions were performed at 375, 400, 425, and 450 {degree}C. For RP-1, decomposition reactions were only performed at 450 {degree} ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901027

77. Thermal Decomposition Kinetics of Kerosene-based Rocket Propellants. 2. RP-2 with Three Additives
Topic: Chemical Analysis
Published: 9/9/2009
Authors: Jason A Widegren, Thomas J Bruno
Abstract: The thermal decomposition of RP-2 with three potential stabilizing additives was investigated. The additives were 1,2,3,4-tetrahydroquinoline (THQ), 1,2,3,4-tetrahydronaphthalene (tetralin) and the additive package that is used to make JP-8+100 (here ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901028

78. A General Method for the Quantitative Measurement of Molecular Mass Distribution by Mass Spectrometry
Topic: Chemical Analysis
Published: 9/1/2009
Authors: Eun S. Park, William E Wallace III, Charles Martin Guttman, Kathleen M. Flynn, Mickey Richardson, Gale Antrus Holmes
Abstract: A method is presented to test whether the conversion of the mass spectrum of a polydisperse analyte to its molecular mass distribution is quantitative. Mixtures of samples with different average molecular masses, coupled with a Taylor's expansio ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=902189

79. Simple, Quantitative Headspace Analysis by Cryoadsorption on a Short Alumina PLOT Column
Topic: Chemical Analysis
Published: 8/1/2009
Author: Thomas J Bruno
Abstract: The use of purge and trap methods for sampling volatile organic compounds prior to chromatographic analysis is a mature technology.  Application to low volatility compounds has been far less facile and sensitive.  Especially problematic has ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=832252

80. Analysis of the Structure and Function of YfcG from Escherichia coli Reveals an Efficient and Unique Disulfide Bond Reductase
Topic: Chemical Analysis
Published: 7/21/2009
Authors: Megan C Wadington , Jane E Ladner, N V Stourman, Joel M Harp, R N Armstrong
Abstract: YfcG is one of eight glutathione (GSH) transferase homologues encoded in the Escherichia coli genome. The protein exhibits low or no GSH transferase activity toward a panel of electrophilic substrates. In contrast, it has a very robust disulfidebond ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=903003



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