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Topic Area: Chemistry

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11. Electrical Testing of Cement-Based Materials: Role of Testing Techniques, Sample Conditioning, and Accelerated Curing
Topic: Chemistry
Published: 4/1/2014
Authors: Robert Spragg, Yiwen Bu, Kenneth Alan Snyder, Dale P Bentz, Jason Weiss
Abstract: These projects examined the potential for using electrical testing on concrete as a potential surrogate for obtaining information on ion and fluid transport. Electrical measurements are particularly attractive for use in quality control as they are e ...

12. Characterization of Emerging Ambient Pressure Mass Spectrometric Techniques using Time-of-Flight Secondary Ion Mass Spectrometry
Topic: Chemistry
Published: 3/28/2014
Authors: Shinichiro Muramoto, Thomas P Forbes, Matthew E Staymates, John G Gillen
Abstract: Time-of-flight secondary ion mass spectrometry (ToF-SIMS) was used to characterize the desorption performance of two emerging ambient ionization mass spectrometry (MS) sources; desorption electrospray ionization (DESI) and low temperature plasma (LTP ...

13. A Methodology for Developing Authentication Assurance Level Taxonomy for Smart Card-based Identity Verification
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7849
Topic: Chemistry
Published: 3/5/2014
Author: Ramaswamy Chandramouli
Abstract: Smart cards (smart identity tokens) are now being extensively deployed for identity verification for controlling access to Information Technology (IT) resources as well as physical resources. Depending upon the sensitivity of the resources and the ri ...

14. Certification of Total Arsenic in Blood and Urine Standard Reference Materials by Radiochemical Neutron Activation Analysis and Inductively Coupled Plasma - Mass Spectrometry
Topic: Chemistry
Published: 3/1/2014
Authors: Rick L Paul, William C Davis, Karen E Murphy, Colleen E Bryan, Lee Lijian Yu, William F Guthrie, Dennis D Leber, Thomas W Vetter
Abstract: A newly developed procedure for determination of arsenic by radiochemical neutron activation analysis was used to measure arsenic in SRM 955c Toxic Elements in Caprine Blood and SRM 2668 Toxic Elements in Frozen Human Urine for the purpose of providi ...

15. A four-pixel single-photon pulse-position array fabricated from WSi superconducting nanowire single- photon detectors
Topic: Chemistry
Published: 2/3/2014
Authors: Varun Boehm Verma, Robert Daniel Horansky, Francesco Marsili, Jeffrey Stern, Matthew Shaw, Adriana Eleni Lita, Richard P Mirin, Sae Woo Nam
Abstract: We demonstrate a scalable readout scheme for an infrared single-photon pulse-position camera consisting of WSi superconducting nanowire single-photon detectors. For an N {multiply} N array, only 2 {multiply} N wires are required to obtain the pos ...

16. Quantitative X-Ray Powder Diffraction Analysis of Portland Cements: Proficiency Testing for Laboratory Assessment
Topic: Chemistry
Published: 2/1/2014
Author: Paul E Stutzman
Abstract: Quantitative x-ray powder diffraction analysis (QXRD) is being used within the cement industry for phase characterization of hydraulic cement. The current ASTM standard test method for powder diffraction analysis of cements provides guidance, but n ...

17. Hybrid-Phospholipid Bilayer Coatings for Separations of Cationic Proteins in Capillary Zone Electrophoresis
Topic: Chemistry
Published: 1/20/2014
Authors: Elyssia S. Gallagher, Seid M Adem, Leonard K. Bright, Elisabeth Mansfield, Craig A. Aspinwall
Abstract: Separations of proteins and peptides in capillary zone electrophoresis suffer from non-specific adsorption of the analytes to the capillary surface. Semi-permanent phospholipid bilayers have been used to minimize adsorption, but must be regenerated ...

18. Template synthesis of gold nanoparticles with an organic molecular cage
Topic: Chemistry
Published: 1/16/2014
Authors: Ryan McCaffrey, Hai Long, Yinghua Jin, Aric Warner Sanders, Wounjhang Park, Wei Zhang
Abstract: We report a novel strategy for the controlled synthesis of gold nanoparticles (AuNPs) with narrow size distribution (1.9 {plus or minus} 0.4 nm) through NP nucleation and growth inside the cavity of a well-defined three-dimensional, shape-persist ...

19. Development of Standard Reference Materials for Cement-Based Materials
Topic: Chemistry
Published: 1/6/2014
Authors: Chiara F Ferraris, Nicos Martys, William L George
Abstract: Rotational rheometers are routinely used for homogeneous materials, but their usage for characterization of a granular fluid like concrete is a relatively new phenomenon. As measurements with rheometers can involve flow in a complex geometry, it is ...

20. Accelerated and Natural Carbonation of Concretes with Internal Curing and Shrinkage/Viscosity Modifiers
Topic: Chemistry
Published: 1/5/2014
Authors: Alejandro Duran-Herrera, Jose Manuel Mendoza-Rangel, Edgar de los Santos Rodriguez, Francisco Vazquez, P Valdez, Dale P Bentz
Abstract: In many parts of the world, corrosion of reinforcing steel in concrete induced by carbonation of the concrete continues to be a major durability concern. This paper investigates the accelerated and natural carbonation resistance of a set of 7 concret ...

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