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Displaying records 61 to 70 of 793 records.
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61. Characterizing Vaccinium berry Standard Reference Materials using NIST Mass Spectral Libraries
Topic: Chemistry
Published: 1/6/2013
Authors: Mark S Lowenthal, Nirina Rabe Andriamaharavo, Stephen E Stein, Karen W Phinney
Abstract: A gas chromatography-mass spectrometry-based (GC-MS) method was developed for qualitative characterization of metabolites found in Vaccinium-fruit (berry) dietary supplement Standard Reference Materials (SRMs). Definitive identifications are pro ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912593

62. NIST/NIH Vitamin D Metabolites Quality Assurance Program Report of Participant Results: Winter 2010 Compatibility Study (Exercise 1)
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7890
Topic: Chemistry
Published: 12/21/2012
Authors: Mary Bedner, Katrice A Lippa
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911152

63. Precise conductance measurements of a pinhole orifice using a constant-pressure flowmeter
Topic: Chemistry
Published: 12/1/2012
Authors: James A Fedchak, Dana R Defibaugh
Abstract: A pinhole orifice with a known conductance can be used as the basis of a flowmeter. Commercially available laser-drilled pinhole orifices with diameters ranging from 1.0 μm to 50 μm can have conductances ranging from about 0.1 μL/s to ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=908391

64. A Humidity Generator for Temperatures to 200 °C and Pressures to 1.6 MPa
Topic: Chemistry
Published: 11/30/2012
Authors: D Vega-Maza, W Wyatt Miller, Dean C Ripple, Gregory E Scace
Abstract: We have constructed a new humidity generator that produces gas streams of known moisture content at temperatures from 85 °C to 200 °C, absolute pressures from 0.2 MPa to 1.6 MPa, and relative humidities from 10 % to 90 %. The generator produces a moi ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=905234

65. Absolute line intensities for ethylene from 1800 to 2350 cm-1.
Topic: Chemistry
Published: 11/17/2012
Authors: Walter Joseph Lafferty, Jean-Marie Flaud, A. Ben Hassen, F. Kwabia Kwabia Tchana, X Landsheere, H Aroui
Abstract: Fourteen Fourier transform spectra of ethylene (C2H4) have been recorded in the 1800-2350 spectral domain with different path-lengths and pressures and used to derive individual line intensities for lines belonging to the ν7 + ν8, ν4 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911859

66. Modeling Chloride transport in Cracked Concrete: A 3-D image-based microstructure simulation
Topic: Chemistry
Published: 10/3/2012
Authors: Edward Joseph Garboczi, Dale P Bentz, Jeffrey M. Davis, Yang Lu
Abstract: The prediction of the service life of concrete materials is difficult, mainly because of their complex heterogeneous microstructure and their random nature. Studying the presence of cracks in concrete and their effect on chloride transport and reacti ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912153

67. Biosynthesis of Athmu, a alpha,gamma-hydroxy-ß-amino acid of pahayokolides A-B
Topic: Chemistry
Published: 10/2/2012
Authors: Li Liu, Daniel W Bearden, Juan C. Rodriguez, Kathleen S. Rein
Abstract: Pahayokolides A-B are cyanobacteria derived non-ribosomal peptides which exhibit cytotoxicity against a number of cancer cell lines. The biosynthetic origin of the 3-amino-2,5,7,8- tetrahydroxy-10-methylundecanoic acid (Athmu) moiety has been inv ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912206

68. A 4:1 transmission-line impedance transformer for broadband superconducting circuits
Topic: Chemistry
Published: 10/1/2012
Authors: Leonardo Matteo Ranzani, Lafe F. Spietz, Jose Alberto Aumentado, Zoya Popovic
Abstract: We present a 4 : 1 superconducting transmission-line impedance transformer for cryogenic applications. The device transforms 25 {Omega} in the coplanar waveguide to 6.25 {Omega} in the microstrip and is designed to operate at 20 mK. Calibrated me ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=910366

69. Guidelines for Access Control System Evaluation Metrics
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7874
Topic: Chemistry
Published: 9/14/2012
Authors: Chung Tong Hu, Karen Scarfone
Abstract: The purpose of this document is to provide Federal agencies with background information on access control (AC) properties, and to help access control experts improve their evaluation of the highest security AC systems. This document discusses the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911110

70. Measurement of Scattering Cross Section with a Spectrophotometer with an Integrating Sphere Detector
Series: Journal of Research (NIST JRES)
Report Number: 117.012
Topic: Chemistry
Published: 9/13/2012
Authors: Lili Wang, Steven J Choquette, Yu-Zhong Zhang, Victoria Karpiak, Adolfas Kastytis Gaigalas
Abstract: A commercial spectrometer with an integrating sphere (IS) detector was used to measure the scattering cross section of microspheres. Analysis of the measurement process showed that two measurements of the extinction, one with the cuvette placed i ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=909272



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