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11. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914470

12. 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915854

13. 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. ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915011

14. Activation Energies of High-Volume Fly Ash Ternary Blends: Hydration and Setting
Topic: Chemistry
Published: 7/17/2014
Author: Dale P Bentz
Abstract: Because ready-mixed concrete is placed under a wide variety of environmental conditions, the influence of temperature on the hydration reactions and the accompanying setting (hardening) process is of critical importance. While contractors are general ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914612

15. Anticipating the Setting Time of High-Volume Fly Ash Concretes Using Electrical Measurements: Feasibility Studies Using Pastes
Topic: Chemistry
Published: 7/17/2014
Authors: Dale P Bentz, Kenneth Alan Snyder, Amzaray M Ahmed
Abstract: One common concern limiting the proliferation of high-volume fly ash (HVFA) concrete mixtures is the significant delay in setting that is sometimes encountered in field concrete mixtures. While several methods to mitigate the delayed setting times of ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914999

16. Uncertainty in Bogue-Calculated Phase Composition of Hydraulic Cements
Topic: Chemistry
Published: 7/1/2014
Author: Paul E Stutzman
Abstract: The Bogue calculations of cement composition are used for manufacturing process control and cement classification. While it is commonly understood that the Bogue calculations are estimates with potential intrinsic biases, the magnitudes of such bia ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=914762

17. Measuring Freeze and Thaw Damage in Mortars Containing Deicing Salt Using a Low Temperature Longitudinal Guarded Comparative Calorimeter and Acoustic Emission (AE-LGCC)
Topic: Chemistry
Published: 6/23/2014
Authors: Yaghoob Farnam, Dale P Bentz, Aaron Richard Sakulich, Daniel Robert Flynn, Jason Weiss
Abstract: Deicing salts are often applied to the surface of pavements and bridge decks in the winter to melt ice; thereby improving safety for the travelling public. In this paper, the influence of NaCl deicing salt on freezing and thawing temperatures of pore ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913946

18. Transport Properties of Fluids near Critical Points
Topic: Chemistry
Published: 6/5/2014
Authors: Jan Vincent Sengers, Richard A Perkins
Abstract: This chapter reviews the currently available information concerning the behavior of transport properties near the vapor-liquid critical point of fluids and fluid mixtures. Special attention is devoted to the behavior of the thermal conductivity which ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913373

19. Computer-Assisted Quality Control for Building Libraries from Electrospray Ionization Tandem Mass Spectra
Topic: Chemistry
Published: 6/4/2014
Authors: Xiaoyu Yang, Pedatsur Neta, Stephen E Stein
Abstract: Electrospray ionization (ESI) tandem mass spectrometry coupled with liquid chromatography is a routine technique for identifying and quantifying compounds in complex mixtures. The identification step can be aided by matching acquired tandem mass ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915314

20. Clemens von Sonntag and the early history of radiation-induced sugar damage in DNA
Topic: Chemistry
Published: 6/2/2014
Author: M Miral Dizdar
Abstract: This article reviews the early history of radiation-induced sugar damage in DNA in dedication to Prof. Clemens von Sonntag, who recently passed away. It covers the ten years between 1968 and 1978, during which most of the work on the ionizing radiati ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915276



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