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Displaying records 41 to 50 of 810 records.
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41. Probing the intracellular glutathione redox potential using in-cell NMR spectroscopy
Topic: Chemistry
Published: 1/2/2014
Authors: Steve Y. Rhieu, Aaron A Urbas, Daniel W Bearden, John P Marino, Vytautas Reipa, Katrice A Lippa
Abstract: Non-invasive and real-time analysis of cellular redox processes has been greatly hampered by lack of suitable measurement techniques. Here we describe an in-cell nuclear magnetic resonance (NMR)-based method for measuring the intracellular glutathion ...

42. Nondestructive Testing (NDT) and Sensor Technology for Service Life Modeling of New and Existing Concrete Structures
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7974
Topic: Chemistry
Published: 12/18/2013
Authors: Kenneth Alan Snyder, Li Piin Sung, Geraldine S Cheok
Abstract: Nondestructive test (NDT) methods and sensor technologies are evaluated in the context of providing input parameters to service life prediction models for reinforced concrete structures. Relevant NDT methods and sensors are identified that are based ...

43. Forensic Analysis Methodology for Thermal and Chemical Characterization of Homemade Explosives
Topic: Chemistry
Published: 11/24/2013
Authors: Ashot Nazarian, Cary Presser
Abstract: Forensic identification of homemade explosives is critical for determining the origin of the explosive materials and precursors, and formulation procedures. Normally, the forensic examination of the pre- and post-blast physical evidence lacks specif ...

44. Fluctuation Enhanced Sensing (FES) with a Nanostructured Semiconducting Metal Oxide Film for Gas Detection and Classification
Topic: Chemistry
Published: 10/31/2013
Authors: Bulent Ayhan, Chiman Kwan, Jin Zhou, Laszlo Kish, Kurt D Benkstein, Phillip H. Rogers, Stephen Semancik
Abstract: The feasibility of fluctuation-enhanced sensing (FES) for the detection and classification of different gases by using a single microsensor has been experimentally demonstrated. A nanostructured semiconducting metal oxide film has been used as a chem ...

45. Connection between thermodynamics and dynamics of simple fluids in highly attractive pores
Topic: Chemistry
Published: 10/25/2013
Authors: William P Krekelberg, Vincent K Shen, Daniel W Siderius, Thomas M. Truskett, Jeffrey R. Errington
Abstract: We investigate the structural and diffusive dynamics properties of a model fluid in highly-absorptive cylindrical pores. At subcritical temperatures, self diffusion displays three distinct regimes as a function of average pore density ρ: 1) a de ...

46. The Seventh Industrial Fluid Properties Simulation Challenge
Topic: Chemistry
Published: 10/8/2013
Authors: Riaz Ahmad, John K. Brennan, Kevin A Frankel, Jonathan D Moore, Joshua D Moore, Raymond Dale Mountain, Richard Ross, Vincent K Shen, Nathan E Schultz, Daniel W Siderius, Kenneth D Smith, Matthias Thommes
Abstract: The primary goal of the seventy industrial fluid properties simulation challenge was to test the ability of molecular simulation methods to predict the adsorption of organic adsorbates in zeolite materials. Zeoliet adsorbents are used in a variety o ...

47. A note on the critical enhancement of transport properties and correlation length of fluids
Topic: Chemistry
Published: 10/6/2013
Authors: Richard A Perkins, Jan Vincent Sengers
Abstract: The thermal conductivity and viscosity are known to exhibit an enhancement in fluids due to critical fluctuations. We have reviewed procedures proposed in the literature for estimating the correlation length determining the magnitude of these enhance ...

48. An Assessment of 25-Hydroxyvitamin D Measurements in Comparability Studies Conducted by the Vitamin D Metabolites Quality Assurance Program
Topic: Chemistry
Published: 8/12/2013
Authors: Mary Bedner, Katrice A Lippa, Susan Shu Cheng Tai
Abstract: Background: The National Institute of Standards and Technology (NIST), in collaboration with the National Institutes of Health Office of Dietary Supplements, established the first accuracy-based program for improving the comparability of vitamin D me ...

49. Sensors and Monitoring to Assess Grout and Vault Behavior for Performance Assessments
Topic: Chemistry
Published: 8/12/2013
Authors: Kenneth Alan Snyder, Jason Weiss
Abstract: To support performance assessment (PA) of waste vaults and grout monoliths, the National Institute of Standards and Technology (NIST) has performed a preliminary evaluation of the state-of-the-art of sensors, nondestructive evaluation methods, and an ...

50. Trace water vapor analysis in specialty gases: sensor and spectroscopic approaches
Topic: Chemistry
Published: 7/1/2013
Authors: Kristine A Bertness, Mark W. Raynor, Kevin C Cossel, Florian B. Adler, Jun Ye
Abstract: The analysis of water vapor impurity is important in a number of specialty gas applications. However the main driver for the development and advancement of trace H^u2^O analysis techniques has been the microelectronics industry. The International ...

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