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Displaying 25851 - 25875 of 74176

Limit of detection determination for censored samples.

January 11, 2011
Author(s)
Andrew L. Rukhin, Daniel V. Samarov
The problem of setting the limit of detection is considered for censored samples and heterogeneous errors. After formal definitions of the critical level and of the method detection limit, we introduce simplified maximum likelihood-type estimators. The

WATER TRANSPORT ACROSS A POLYMER ELECTROLYTE MEMBRANE UNDER THERMAL GRADIENTS

January 11, 2011
Author(s)
David L. Jacobson, Richard Fu, Takeshi Shiomi, Ugur Pasaogullari, Joshua Preston, Shinichi Miyazaki, Yuichiro Tabuchi, Daniel S. Hussey
A fundamental experimental and numerical study of the water transport across a perfluorosulfonic acid (PFSA) membrane under a temperature gradient is presented. The water transport phenomenon was experimentally investigated through water flux measurement

Reduced Nonlinearity Effect on the Electronic Measurement of the Boltzmann Constant

January 10, 2011
Author(s)
Jifeng Qu, Samuel Benz, Alessio Pollarolo, Horst Rogalla
NIST has developed a quantum voltage noise source (QVNS) calibrated Johnson noise thermometer (JNT) to provide a new electronic measurement technique for determining the Boltzmann constant. Improvements in electronics and synthesized noise waveforms have

Evolution of Microscopic Localization in Graphene in a Magnetic Field: From Scattering Resonances to Quantum Dots.

January 9, 2011
Author(s)
Suyong S. Jung, Gregory M. Rutter, Nikolai Klimov, David B. Newell, Irene G. Calizo, Angela R. Hight Walker, Nikolai Zhitenev, Joseph A. Stroscio
Graphene is a unique material displaying high-mobility transport in monolayer-thin films. However, its properties are strongly dependent on interactions with substrates, local charges and environment. Scanned probe microscopies can be used to locally probe

Efficiency Enhancement of Copper Contaminated Radial p-n Junction Solar Cells

January 7, 2011
Author(s)
Akram Boukai, Paul M. Haney, Aaron Katzenmeyer, Gregg M. Gallatin, Albert A. Talin, Peidong Yang
A significant fraction of the cost of a planar p-n junction silicon solar cell stems from the silicon purification process.1 Eliminating the purification step would decrease the cost, yet also decrease the solar cell efficiency significantly. Here, we have

Quantification of cholesterol-metabolizing P450s CYP27A1 and CYP46A1 in neural tissues reveals a lack of enzyme-product correlations in human retina but not human brain

January 7, 2011
Author(s)
Wei-Li Liao, Gun-Young Heo, Nathan G. Dodder, Rachel Reem, Natalia Mast, Suber Huang, Pier L. DiPatre, Illarion Turko, Irina A. Pikuleva
Improper cholesterol metabolism in the brain causes neurological diseases. Factors affecting cholesterol homeostasis includes cholesterol hydroxylation reactions, which are regulated by cytochrome P450 enzymes. One approach to estimate the total enzymatic

ThermoML an XML-based Approach for Storage and Exchange of Experimental and Critically Evaluated Thermophysical and Thermochemical Property Data. 5. Speciation and Complex Equilibria

January 7, 2011
Author(s)
Michael D. Frenkel, Vladimir Diky, Robert D. Chirico, Robert N. Goldberg, Heiko Heerklotz, John E. Ladbury, David P. Remeta, John H. Dymond, Anthony R. Goodwin, Kenneth N. Marsh, William A. Wakeham, Stephen E. Stein, Paul L. Brown, Erich Koenigsberger, Peter A. Williams
ThermoML is an XML-based approach for storage and exchange of experimental and critically evaluated thermophysical and thermochemical property data. Extensions to the ThermoML schema for the representation of speciation and complex equilibria are described

Enticing arsonists with broken windows and social disorder

January 6, 2011
Author(s)
Douglas Thomas, David Butry, Jeffrey P. Prestemon
Arson rates vary widely across the U.S., and much of this variation can be traced to fuel and weather factors related to ignition success and socioeconomic factors shown to influence crime rates. In criminology, it is well understood that indicators of

Droplet/Surface Interaction: Relevance to Fire Suppression

January 5, 2011
Author(s)
Anthony P. Hamins
Due to the ban of Halon 1301 under the Montreal Protocol, new liquid fire suppressants have been proposed as possible alternatives to Halon 1301 in certain fires. It has been reported that in the case of water mist fire suppression systems, a large

New Capabilities for Process and Interaction Modeling in BPMN 2

January 5, 2011
Author(s)
Stephen White, Conrad Bock
This paper provides a high-level introduction to new features in processes and interaction diagrams in the Business Process Model and Notation (BPMN) Version 2.0. BPMN 2.0 expands the capabilities of BPMN 1.x Process and Collaboration diagrams, and adds

NIST Time and Frequency Bulletin

January 5, 2011
Author(s)
Petrina C. Potts
The Time and Frequency Bulletin provides information on performance of time scales and a variety of broadcasts (and related information) to users of the NIST services.

Suppression Limits of Low Strain Rate Non-Premixed Flames

January 5, 2011
Author(s)
Matthew F. Bundy, Anthony P. Hamins
The suppression of low strain rate non-premixed flames was investigated experimentally in a counterflow configuration through the development of a methodology that allows establishment of laminar flames free from conductive heat losses. The method allows

Cloud Hooks: Security and Privacy Issues in Cloud Computing

January 4, 2011
Author(s)
Wayne Jansen
In meteorology, the most destructive extratropical cyclones evolve with the formation of a bent-back front and cloud head separated from the main polar-front, creating a hook that completely encircles a pocket of warm air with colder air. The most damaging

A Survey of hp-Adaptive Strategies for Elliptic Partial Differential Equations

January 3, 2011
Author(s)
William F. Mitchell, Marjorie A. McClain
The hp version of the finite element method (hp-FEM) combined with adaptive mesh refinement is a particularly efficient method for solving partial differential equations because it can achieve a convergence rate that is exponential in the number of degrees

An interferometric platform for studying AFM probe deflection

January 3, 2011
Author(s)
Jon R. Pratt, Lee Kumanchik, Tony L. Schmitz
This paper describes an interferometric platform for measuring the full-field deflection of atomic force microscope (AFM) probes and generic cantilevers during quasi-static loading. The platform consists of a scanning white light interferometer (SWLI)
Displaying 25851 - 25875 of 74176
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