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Search Publications

NIST Authors in Bold

Displaying 20776 - 20800 of 73960

Measurement, Standards, and Data Needs for CO2 Capture Materials: A Critical Review

October 21, 2013
Author(s)
Laura Espinal, Dianne L. Poster, Winnie K. Wong-Ng, Andrew J. Allen, Martin L. Green
The commercial deployment of cost-effective carbon capture technology is hindered partially by the lack of a proper suite of materials-related standards, data, and measurement methods, which would provide critical information for the systematic design of

Imaging topological edge states in silicon photonics

October 20, 2013
Author(s)
Mohammad Hafezi, Jingyun Fan, Alan L. Migdall, Jacob M. Taylor
Systems with topological oder exhibit exotic phenomena including fractional statistics. While most systems with topological order have been electronic, advances in our understanding of synthetic gauge fields have enabled realization of topological order in

Ranging Performance Evaluation of a Laser Scanner

October 20, 2013
Author(s)
Massimiliano M. Ferrucci, Balasubramanian Muralikrishnan, Christopher J. Blackburn, Daniel S. Sawyer, Steven D. Phillips, Vincent D. Lee, Peter Petrov, Yuri Yakovlev, Andrey Astrelin, Spike Milligan, John Palmateer
Large volume laser scanners are used for a variety of purposes, including dimensional metrology of large artifacts, digitization and reverse engineering, as well as historical preservation and archiving. In evaluating the performance of laser scanners, we

VOLUMETRIC PERFORMANCE EVALUATION OF A LASER SCANNER

October 20, 2013
Author(s)
Balasubramanian Muralikrishnan, Massimiliano M. Ferrucci, Daniel S. Sawyer, Grant Gerner, Vincent D. Lee, Christopher J. Blackburn, Steven D. Phillips, Peter Petrov, Yuri Yakovlev, Andrey Astrelin, Spike Milligan, John Palmateer
There are several sources of error in a laser scanner measurement. The optical and material properties of the target, the shape, form, surface texture, color, reflectivity, and orientation of the target in space, environmental effects, etc., all contribute

Avoiding Accidental Data Loss

October 18, 2013
Author(s)
Richard L. Kissel
Does your organization have systematic procedures to remove sensitive data from obsolete equipment, or do you use a somewhat ad hoc process for the cleanup and disposal of old gear? Careless disposal of data storage hardware has led to costly and

Creating Integrated Evidence Graphs for Network Forensics

October 18, 2013
Author(s)
Changwei Liu, Anoop Singhal, Duminda Wijesekera
Evidence Graphs model network intrusion evidence and their dependencies, which helps network forensics analyst collate and visualize dependencies. In particular, probabilistic evidence graph provide a way to link probabilities associated with different

Practical Use and Calculation of CCT and Duv

October 18, 2013
Author(s)
Yoshihiro Ohno
The Correlated Color Temperature (CCT) is often used to represent chromaticity of white light sources, but chromaticity is two-dimensional, and another dimension, the distance from the Planckian locus, is often missing. Duv is defined in ANSI C78.377 for

Statistical Prediction of Sealant Modulus Change due to Outdoor Weathering

October 17, 2013
Author(s)
Christopher C. White, Kar T. Tan, Donald L. Hunston, Adam L. Pintar, James J. Filliben
Recently a statistically based model has been created to predict the change in modulus for a sealant exposed to outdoor weathering. The underlying high precision data supporting this model was obtained using the NIST SPHERE (Simulated Photo degradation by

Determining carbapenemase activity with 18O labeling and targeted mass spectrometry

October 16, 2013
Author(s)
Meiyao Wang, Yang Shen, Illarion Turko, Daniel Nelson, Shuwei Li
Carbapenems are broad spectrum antibiotics considered as last resort drugs to treat bacterial infections. Carbapenem-hydrolyzing β-lactamases (also called carbapenemases), however, can confer bacterial resistance and represent a serious health threat. Here

Ontology for Big Systems: The Ontology Summit 2012 Communique

October 16, 2013
Author(s)
Ram D. Sriram, Mary C. Brady
The Ontology Summit 2012 explored the current and potential uses of ontology, its methods and paradigms, in big systems and big data: How ontology can be used to design, develop, and operate such systems. The systems addressed were not just software

Evaluating Fire Blocking Performance of Barrier Fabrics

October 15, 2013
Author(s)
Shonali Nazare, William M. Pitts, Shaun M. Flynn, John R. Shields, Rick D. Davis
The purpose of fire blocking barrier materials is to reduce the flammability of soft furnishings ( mattresses and upholstered furniture) by preventing or delaying direct flame impingement from open flames and/or heat transfer from smoldering ignition

Isotope Dilution Mass Spectrometry For Quantitative Elemental Analysis Of Powdered Samples By Radiofrequency Pulsed Glow Discharge Time Of Flight Mass Spectrometry

October 15, 2013
Author(s)
John L. Molloy, Julian Malherbe, Fanny Claverie, Beatriz Fernandez, Aitor Alvarez-Toral, Alfredo Sanz-Medel, Rosario Pereiro
In recent years particular effort is being devoted to the development of pulsed glow discharges (PGDs) for mass spectrometry because this powering operation mode could offer important ionization analytical advantages. However, the capabilities of

Use of radiation pressure for measurement of high-power laser emission

October 15, 2013
Author(s)
Paul A. Williams, Joshua A. Hadler, Robert Lee, Frank Maring, John H. Lehman
We demonstrate a paradigm in absolute laser radiometry where a laser beam's power can be measured from its radiation pressure. Using an off-the-shelf high-accuracy mass scale and a 500 W Yb-doped fiber laser and a 92 kW CO2 laser, we show preliminary

Entangled photon generation in a phase-modulated, quasi-phasematched crystal

October 14, 2013
Author(s)
Paulina S. Kuo, Jason S. Pelc, Oliver T. Slattery, Yong-Su Kim, Xiao Tang
We propose a scheme to generate polarization-entangled photon pairs by spontaneous parametric downconversion in a phase-modulated, type-II, quasi-phasematched (QPM) crystal. Instead of using two distinct crystals to generate |HV>and |VH> states, the phase

Diamond Sensors and Polycapillary Lenses for X-ray Absorption Spectroscopy

October 13, 2013
Author(s)
Bruce D. Ravel
Diamond sensors are evaluated as incident beam monitors for X-ray Absorption Spectroscopy experiments. These single crystal devices pose a challenge for an energyscanning experiment using hard X-rays due to the e ect of diffraction from the crystalline

Comprehensive analysis of protein digestion using six trypsins reveals the origin of trypsin as a significant source of variability in proteomics

October 11, 2013
Author(s)
Stephen E. Stein, Paul A. Rudnick, Scott J. Walmsley, Qian Dong, Alexey I. Nesvizhskii, Yuxue Liang
Trypsin is an endoprotease commonly used for sample preparation in proteomics experiments. Importantly, protein digestion is dependent on multiple factors, including the trypsin origin and digestion conditions. In-depth characterization of trypsin activity
Displaying 20776 - 20800 of 73960
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