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You searched on: Topic Area: Chemistry

Displaying records 81 to 90 of 810 records.
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81. Temperature Dependence of Electron Magnetic Resonance Spectra of Iron Oxide Nanoparticles Mineralized in Listeria Innocua Protein Cages
Topic: Chemistry
Published: 10/16/2012
Author: Robert J. Usselman
Abstract: Electron magnetic resonance (EMR) spectroscopy was used to determine the magnetic properties of maghemite (gamma-F^de^2O^d3^) nanoparticles formed within size-constraining {I}Listeria innocua{/I} Dps protein cages that have an inner diameter of 5 nm. ...

82. 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 ...

83. 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 ...

84. A 4:1 transmission-line impedance transformer for broadband superconducting circuits
Topic: Chemistry
Published: 10/1/2012
Authors: Leonardo M. 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 ...

85. 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 ...

86. 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 ...

87. Recommended vapor pressure and thermophysical data for ferrocene
Topic: Chemistry
Published: 8/14/2012
Authors: Michal Fulem, Kvetoslav Ruzicka, Marisa A.A. Rocha, Luis M.N.B.F. Santos, Robert F Berg
Abstract: Recommended vapor pressure data for ferrocene (CAS Registry Number: 102-54-5) in the temperature range from 242 to 447 K were developed by the simultaneous correlation of critically assessed vapor pressures, heat capacities of the crystalline phase a ...

88. SEABIRD TISSUE ARCHIVAL AND MONITORING PROJECT: Egg Collections and Analytical Results for 2006-2009
Series: NIST Interagency/Internal Report (NISTIR)
Report Number: 7872
Topic: Chemistry
Published: 8/2/2012
Authors: Stacy S Vander-Pol, Paul R. (Paul) Becker, Sylvain Berail, Russell D Day, Olivier F. X. Donard, Keith A. Hobson, Amanda J Moors, Rebecca S Pugh, Lauren B. Rust, David G. Roseneau
Abstract: Since 1999, the Seabird Tissue Archival and Monitoring Project (STAMP) has collected, banked, and analyzed seabird eggs using established protocols to monitor chlorinated pesticides, polychlorinated biphenyls (PCBs), brominated flame retardants, ...

89. Using Viscosity Modifiers to Reduce Effective Diffusivity in Mortars
Topic: Chemistry
Published: 8/1/2012
Authors: Kenneth Alan Snyder, Dale P Bentz, Jeffrey M. Davis
Abstract: Three viscosity modifiers (a commercial shrinkage-reducing admixture, a polypropylene glycol, and cellulose ether) are used to reduce the effective diffusivity of chloride ions through mortars during a one-year exposure. Two delivery mechanisms ...

90. Observing chemical reactions using Transmission Electron Microscopy
Topic: Chemistry
Published: 7/17/2012
Author: Renu Sharma

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