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Topic Area: Chemical Analysis

Displaying records 71 to 80 of 154 records.
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71. 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

72. 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

73. 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

74. 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

75. 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

76. 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

77. 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

78. 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

79. 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

80. Composition-Explicit Distillation Curves for Mixtures of Diesel Fuel with Dimethyl Carbonate and Diethyl Carbonate
Topic: Chemical Analysis
Published: 7/14/2009
Authors: Thomas J Bruno, Arron Wolk, Alexander Naydich, Marcia L Huber
Abstract: We have recently introduced several important improvements in the measurement of distillation curves of complex fluids. The modifications to the classical measurement provide for (1) a composition explicit data channel for each distillate fraction ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=901495



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