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Displaying records 61 to 70 of 99 records.
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61. Reference measurements of Hydrogen's Dielectric Permittivity
Topic: Chemical Engineering & Processing
Published: 8/10/2009
Authors: James W Schmidt, Michael R Moldover, Eric F. May
Abstract: We used a quasi-spherical cavity resonator to measure the relative dielectric permittivity {epsilon}^dr^ of H^d2^ at frequencies from 2.4 GHz to 7.3 GHz, at pressures up to 6.5 MPa, and at the temperatures 273 K and 293 K. The resonator was calibrat ...

62. Relating Complex Fluid Composition and Thermophysical Properties with the Advanced Distillation Curve Approach
Topic: Chemical Engineering & Processing
Published: 3/17/2010
Authors: Thomas J Bruno, Lisa S. Ott, Tara M Lovestead, Marcia L Huber
Abstract: Complex fluids have long posed a significant challenge in our ability to characterize and model fluid properties. Here, we consider complex fluids to be mixtures with many components that can differ significantly in polarity and polarizability. The ...

63. Relaxation Effects in Small Critical Nozzles
Topic: Chemical Engineering & Processing
Published: 1/1/2006
Authors: Aaron N Johnson, C L Merkle, Michael R Moldover, John D Wright
Abstract: We computed the flow of four gases (He, N^d2^, CO^d2^, and SF^d^6) through a critical nozzle by augmenting traditional computational fluid dynamics (CFD) with a rate equation that accounts for {tau}^drelax^, a species-dependent relaxation time that c ...

64. Sealed Cells for the Realization of Triple Points at the National Institute of Standards and Technology
Topic: Chemical Engineering & Processing
Published: 6/24/1996
Author: W L Tew

65. Selected Thermodynamic Properties for Mixtures of R-32 (Difluoromethane), R-125 (Pentafluoroethane), R-134A (1,1,1,2-Tetrafluoroethane), R-143A (1,1,1-Trifluoroethane), R-41 (Fluoromethane), R-290 (Propane), and R-744 (Carbon Dioxide)
Series: Technical Note (NIST TN)
Report Number: 1397
Topic: Chemical Engineering & Processing
Published: 12/1/1997
Authors: C D. Holcomb, Joe W Magee, Jennifer L Scott, Stephanie L Outcalt, William Michael Haynes

66. Shear Thinning Near the Critical Point of Xenon
Topic: Chemical Engineering & Processing
Published: 4/17/2008
Authors: Robert F Berg, Michael R Moldover, M Yao, G A Zimmerli
Abstract: We measured shear thinning, a viscosity decrease ordinarily associated with complex liquids, near the critical point of xenon. The data span the range of reduced shear rates: 0.001 < {gamma}{tau} < 700, where {gamma}{tau} is the shear rate scal ...

67. Simultaneous Measurement of Viscosity and Structure for Rod-Like Micelle Solutions
Topic: Chemical Engineering & Processing
Published: 1/1/1998
Authors: M Y Lin, Howard J. Hanley, Chris D Muzny, G C. Straty

68. Spherical Resonator for Vapor-Phase Speed of Sound and Measurements of 1,1,1,2,2,3,3-heptafluoro-3-methoxypropane (RE347mcc) and trans-1,3,3,3-tetrafluoropropene [R1234ze(E)]
Topic: Chemical Engineering & Processing
Published: 7/14/2015
Authors: Richard A Perkins, Mark O McLinden
Abstract: We describe an apparatus to measure the speed of sound of gas samples at temperatures from 265 K to 500 K with pressures up to 40 MPa. The speed of sound is determined from the frequency of the three lowest-order radial resonance modes for the gas in ...

69. Standard Molar Enthalpies of Formation of Alloys in the Pseudobinary System Zr(Al^dx^Co^d1-x^)^d2^ at the Temperature 298.15 K
Topic: Chemical Engineering & Processing
Published: 9/26/1997
Authors: R Klein, P A G O'Hare, I Jacob

70. Standard Photoacoustic Spectrometer: Model and Validation using O2 A-Band Spectra
Topic: Chemical Engineering & Processing
Published: 6/30/2010
Authors: Keith A Gillis, Daniel K. Havey, Joseph Terence Hodges
Abstract: We model and measure the absolute response of an intensity-modulated photoacoustic spectrometer comprising a 10 cm long resonator and having a {I}Q{/I}-factor of approximately 30. We present a detailed theoretical analysis of the system and predict ...

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