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Displaying records 11 to 20 of 810 records.
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11. Computing the Time Evolution of the Apparent Viscoelastic/Viscoplastic Poisson's Ratio of Hydrating Cement Paste
Topic: Chemistry
Published: 2/15/2015
Authors: Li xiodan, Zachary Grasley, Jeffrey W Bullard, Edward Joseph Garboczi
Abstract: A computational model has been developed that combines finite element methods with microstructure development simulations to quantitatively predict the viscoelastic/viscoplastic relaxation of cement paste due to intrinsic calcium silicate hydrate vis ...

12. NIST/NIH Vitamin D Metabolites Quality Assurance Program Report of Participant Results: Summer 2013 Comparability Study(Exercise 7)
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 8000
Topic: Chemistry
Published: 2/15/2015
Authors: Mary Bedner, Katrice A Lippa, Susan Shu Cheng Tai
Abstract: The National Institute of Standards and Technology (NIST) has established a Vitamin D Metabolites Quality Assurance Program (VitDQAP) in collaboration with the National Institutes of Health (NIH) Office of Dietary Supplements. Participants in the se ...

13. Modeling the apparent and intrinsic viscoelastic relaxation of hydrating cement paste
Topic: Chemistry
Published: 1/31/2015
Authors: Xiaodan Li, Zachary Grasley, Edward Joseph Garboczi, Jeffrey W Bullard
Abstract: Finite element procedures combined with microstructure development modeling are integrated to quantitatively predict the viscoelastic/viscoplastic relaxation of cement paste due to intrinsic calcium silicate hydrate viscoelasticity and microstructure ...

14. Investigating Adsorption/Desorption of Carbon Dioxide in Aluminum Compressed Gas Cylinders
Topic: Chemistry
Published: 12/18/2014
Authors: Walter R Miller Jr., George C Rhoderick, Franklin R Guenther
Abstract: Between June 2010 and June 2011, the National Institute of Standards and Technology gravimetrically prepared a suite of 20 carbon dioxide [CO2] in air primary standard mixtures [PSMs]. Ambient mole fraction levels were obtained through six levels of ...

15. Absolute line intensities for oxirane in the 11.4 micron spectral region.
Topic: Chemistry
Published: 12/15/2014
Authors: Walter Joseph Lafferty, Jean-Marie Flaud, Fridolin Kwabia
Abstract: Absolute individual line intensities of numerous transitions of the fundamental ν15, ν12 and ν5 bands of oxirane (ethylene oxide, cyc-C2H4O) have been measured in the 790-940 cm-1 region using seven high-resolution Fourier transform sp ...

16. Measurement of the Electrostatic Edge Effect in Wurtzite GaN Nanowires
Topic: Chemistry
Published: 11/24/2014
Authors: Alex Henning, Benjamin Klein, Kristine A Bertness, Paul T Blanchard, Norman A Sanford, Yossi Rosenwaks
Abstract: The electrostatic effect of the hexagonal corner on the electronic structure in wurtzite GaN nanowires (NWs) was directly measured using Kelvin probe force microscopy (KPFM). By correlating electrostatic simulations with the measured potential differ ...

17. Influence of the central mode and soft phonon on the microwave dielectric loss near the strain-induced ferroelectric phase transitions in Sr^dn+1^uTi^dn^uO^d3n+1^u*
Topic: Chemistry
Published: 11/12/2014
Authors: V. Goian, S. Kamba, D Nuzhnyy, Nathan Orloff, T. Birol, C.-H Lee, D. G. Schlom, James C Booth
Abstract: Recently, Lee et al.^u[1]^dused~1% tensile strain to induce a ferroelectic instability in thin films of Sr^dn+1^uTi^dn^uO^d3n+1^u (n=1-6) phases. They showed that the Curie temperature T^dc^u gradually increased with n, reaching 180 K for Sr7Ti6O19 ...

18. Loss of H2 and CO from Protonated Aldehydes in Electrospray Ionization Mass Spectrometry
Topic: Chemistry
Published: 9/15/2014
Authors: Pedatsur Neta, Yamil Simon, Yuxue Liang, Stephen E Stein
Abstract: Electrospray ionization mass spectrometry of 3-formylchromones and 3-formylcoumarins shows that collision-induced dissociation of the protonated ions results in elimination of H¬¬2 as a major fragmentation route. This loss of H2 yields an unstabl ...

19. Degrees of Equivalence for Chemical Measurement Capabilities: Primary pH
Topic: Chemistry
Published: 9/10/2014
Authors: David Lee Duewer, Kenneth W Pratt, Chainarong Cherdchu, Nongluck Tangpaisarnkul2 Nongluck Tangpaisarnkul2, Akiharu Hioki, Masaki Ohata, Petra Spitzer, Michal M?ri?ssy, Leo¿ Vysko¿il
Abstract: The Key Comparison (KC) studies of the Consultative Committee for Amount of Substance ‹ Metrology in Chemistry (CCQM) help ensure the reliability of chemical and biochemical measurements relevant to international trade and environmental , health , an ...

20. Reference Correlation of the Viscosity of Benzene from the Triple Point to 675 K and up to 300 MPa
Topic: Chemistry
Published: 8/29/2014
Authors: S. Avgeri, Marc J. Assael, Marcia L Huber, Richard A Perkins
Abstract: This paper contains new, representative reference equations for the viscosity of benzene. The equations are based in part upon a body of experimental data that has been critically assessed for internal consistency and for agreement with theory whenev ...

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