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Displaying 2876 - 2900 of 2915

High-resolution infrared studies of the V10, V11, V14, and V18 levels of [1.1.1] propellane

November 15, 2012
Author(s)
Robynne Kirkpatrick, Tony Masiello, Mathew A. Martin, Joseph W. Nibler, Arthur Maki, Alfons Weber, Thomas A. Blake
This paper is a continuation of earlier work for which the high resolution infrared spectrum of [1.1.1]propellane was measured and its k and l structure resolved for the first time. Here we present results from an analysis of more than 16,000 transitions

A Volcano Curve: Optimizing Methanol Electro-oxidation on Pt decorated Ru Nanoparticles

June 26, 2009
Author(s)
Christopher D. Zangmeister, Savelas A. Rabb, Du Bingchen, YuYe Tong
Controlled Pt adlayers were deposited on commercial Ru nanoparticles (NPs) using an industrially scalable one-pot ethylene glycol (EG) reduction based method and were characterized by X-ray diffraction (XRD), electrochemical (EC) CO stripping voltammetry

Suppression Limits of Low Strain Rate Non-Premixed Methane Flames

May 1, 2003
Author(s)
Matthew F. Bundy, Anthony P. Hamins, Ki Y. Lee
The suppression of low strain rate non-premixed flames was investigated experimentally in a counterflow configuration for laminar flames with minimal conductive heat losses. This was accomplished by varying the velocity ratio of fuel to oxidizer to adjust

Polyelectrolyte Adsorption on Hydroxyapatite

November 1, 2001
Author(s)
Vincent A. Hackley
Hydroxyapatite (HAP) belongs to a family of structurally and chemically related, sparingly soluble calcium phosphate (CP) salts [1], and is the structural prototype for the principal mineral component of bone and teeth [2]. Well-defined synthetic HAP has

New NIST-Certified Length Microscale

January 1, 1996
Author(s)
James E. Potzick
The National Institute of Standards and Technology is developing a simple one-dimension certified pitch standard (or scale) covering the range 1 um to 10 mm, intended for the calibration of microscope magnification and dimensional metrology instrument

Direct measurement of the 3P0 clock state natural lifetime in 87Sr

August 24, 2025
Author(s)
Kyle Beloy, Jonathan Dolde, Dhruva Ganapathy, Xin Zheng, Shuo Ma, Shimon Kolkowitz
Optical lattice clocks based on the narrow transition between (5s2)1S0 -(5s5p)3P0 levels in neutral strontium (Sr) are among the most precise and accurate measurement devices in existence. Although this transition is completely forbidden by selection rules

Strategic Plan for the Manufacturing USA Program

October 29, 2024
Author(s)
Robert G. Rudnitsky, Clifton Ray, Said Jahanmir
This document is the triennial strategic plan for the Manufacturing USA Program, as required by the program's authorizing statute. This strategic plan addresses the role of the Manufacturing USA institutes in developing advanced manufacturing technology

Measuring Dimensionality of Cell-Scaffold Contacts of Primary Human Bone Marrow Stromal Cells Cultured on Electrospun Fiber Scaffolds

January 1, 2023
Author(s)
Carl Simon Jr., Peter Bajcsy, Joe Chalfoun, Michael Paul Majurski, Mary C. Brady, Mylene Simon, Nathan Hotaling, Nick Schaub, Allison Horenberg, Piotr Szczypinski, Dongbo Wang, Veronica DeFelice, Soweon Yoon, Stephanie Florczyk
The properties and structure of the cellular microenvironment can influence cell behavior. Sites of cell adhesion to the extracellular matrix (ECM) initiate intracellular signaling that direct cell functions such as proliferation, differentiation and

Clearing the fog for best in the world air-wavelength

July 1, 2015
Author(s)
Patrick F. Egan, Jack A. Stone Jr.
Laser interferometry, the basis for modern length metrology, achieves very high accuracies as a consequence of the stable, well-known frequencies of laser sources. However, length measurements in air also require corrections based on precise knowledge of

Composition and Carrier Concentration Dependence of the Electronic Structure of InyGa1-yAs1-xNx Films With Nitrogen Mole Fraction Less Than 0.012

November 1, 2005
Author(s)
Youn S. Kang, Lawrence H. Robins, Anthony Birdwell, Alexander J. Shapiro, W. R. Thurber, Mark D. Vaudin, M M. Fahmi, D Bryson, S N. Mohammad
The electronic structure of Si-doped InyGa1-yAs1-xNx films on GaAs substrates, grown bynitrogen-plasma-assisted molecular-beam epitaxy, was examined by photoreflectance PR spectroscopy at temperatures between 20 and 300 K. The films were approximately 0.5

Damage Modes in Dental Crown Multilayer Structures

February 1, 2004
Author(s)
Yu Zhang, Y N. Deng, Brian R. Lawn
The full potential of esthetic ceramic-based dental restorations has not yet been realized. Processing and surgical induced damage, exacerbated by fatigue damage during normal chewing, can reduce the initial strength of inherently brittle materials. The

Standards as Enablers for a Circular Economy

June 30, 2023
Author(s)
KC Morris, Vincenzo Ferrero, Buddhika Hapuwatte, Noah Last, Nehika Mathur
A successful transition to a circular economy (CE) will require global participation, but the path to that transition will follow many unique routes depending on local situations. The transition must have rigorous technical underpinnings and well-conceived

Certification of Standard Reference Material(R) 2196 Axial Resolution Standard for Optical Medical Imaging

February 7, 2023
Author(s)
Jeeseong C. Hwang, Kimberly Briggman, Nikki Rentz, Hyun-Jin Kim, David W. Allen, Lee J. Richter, Sowon Yoon, John Lu
Medical imaging devices and systems must be calibrated to ensure uniformity and reliability of test results. A standard reference material (SRM) or "phantom", as it is known in the medical imaging community, is used to replicate fundamental characteristics

Hybrid quantum systems with trapped charged particles

February 21, 2017
Author(s)
Shlomi S. Kotler, Raymond Simmonds, Dietrich Leibfried, David J. Wineland
Trapped charged particles have been at the forefront of quantum information processing (QIP) for a few decades now, with deterministic two-qubit logic gates reaching record fidelities of 99.9% and single-qubit operations of much higher fidelity. In a

Status of the Liquid Deuterium Cold Neutron Source for the NIST Research Reactor

April 28, 2016
Author(s)
Robert E. Williams, Michael Middleton, Paul Kopetka, J. Michael Rowe, Paul C. Brand
The NBSR is a 20 MW research reactor operated by the NIST Center for Neutron Researcher (NCNR) as a neutron source providing beams of thermal and cold neutrons for research in materials science, fundamental physics and nuclear chemistry. A large, 55 cm

Cellular DNA Biomarkers for the Safety of Tissue-Engineered Medical Products Using Artificial Skin as a Model

October 16, 2008
Author(s)
H Rodriguez, C D. O'Connell, Peter E. Barker, M. Dizdaroglu, Donald H. Atha, Pawel Jaruga, M Birincioglu, M A. Marino, P McAndrew
Fundamental to the safety of many tissue-engineered medical products is how cells respond to a given polymer when implanted into the body. Assurance of cellular stability during the manufacturing, storage and shipment of such products is crucial to achieve

Methylmercury inTtuna: Demonstrating Measurement Capabilities and Evaluating Comparability of Results Worldwide From the CCQM P-39 Comparison

October 12, 2021
Author(s)
C Quetel, J P. Snell, Y Aregbe, L Abranko, Z S. Jokai, C Brunori, R Morabito, W Hagan, S. Azemard, E Wyse, V Fajon, M. Horvat, M. Logar, O.F. X. Donard, E Krupp, J Entwisle, R Hearn, Michele M. Schantz, K Inagaki, A Takatsu, P Grinberg, S. N. Willie, H Hintelmann, E Bjorn, E Blanco Gonzalez, G Centineo, J Ignacio Garcia Alonso, A Sanz-Medel
Six Metrology Institutes (NMIs), representing at the Comit International des Poids et Mesures (CIPM) 4 Member States of the Metre Convention and 2 international organisations, and 8 expert laboratories selected outside CIPM have compared their capabilities

Using uncalibrated lasers as wavelength standards

October 1, 2008
Author(s)
Jack A. Stone Jr.
The fundamental atomic physics of a gas laser transition is such that the transition frequency, or equivalently, the vacuum wavelength of the laser, cannot vary from its central value by more than a few parts in 106. The uncertainty of the gas laser
Displaying 2876 - 2900 of 2915
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