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Displaying records 11 to 20 of 801 records.
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11. 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 ...

12. 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 ...

13. 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 ...

14. 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 ...

15. 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 ...

16. 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 ...

17. Membrane protein resistance of oligo(ethylene oxide) self-assembled monolayers
Topic: Chemistry
Published: 7/31/2014
Authors: David J. Vanderah, Marlon L Walker, David Travis Gallagher, Ryan Vierling, Fay Crawshaw
Abstract: Spectroscopic ellipsometry was used to evaluate the resistance to protein adsorption (RPA) of self- assembled monolayers (SAMs) of HS(CH2)3O(CH2CH2O)6M and [HS(CH2)3CH]2O-(CH2CH2O)6M, where M = CH3 or H, on Au. The SAMs were exposed to fibrinogen ...

18. Metrology for comparison of displacements at the picometer level
Topic: Chemistry
Published: 7/31/2014
Authors: Jack A Stone Jr., Patrick F Egan, Jay H Hendricks, Gregory F Strouse, Douglas A Olson, Jacob E Ricker, Gregory E Scace, Donavon Gerty
Abstract: An apparatus capable of comparing displacements with picometer accuracy is currently being designed at NIST. In principle, we wish to compare one displacement in vacuum to a second, equal displacement in gas, in order to determine gas refractive inde ...

19. Surface and Uniaxial Electrical Measurements on Layered Cementitious Composites having Cylindrical and Prismatic Geometries
Topic: Chemistry
Published: 7/24/2014
Authors: Robert Spragg, Scott Z Jones, Kenneth Alan Snyder, Dale P Bentz, Chiara Villani, Jason Weiss
Abstract: Electrical measurements are becoming a common method to assess the transport properties of concrete. For a saturated homogenous system, the surface resistance and the uniaxial resistance measurements provide equivalent measures of resistivity once g ...

20. Dielectric characterization by microwave cavity perturbation corrected for non-uniform fields
Topic: Chemistry
Published: 7/23/2014
Authors: Nathan D Orloff, Jan Obrzut, Christian John Long, Thomas F. Lam, James C Booth, David R Novotny, James Alexander Liddle, Pavel Kabos
Abstract: The non-uniform fields that occur due to the slot in the cavity through which the sample is inserted and those due to the sample geometry itself decrease the accuracy of dielectric characterization by cavity perturbation at microwave frequencies. ...

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