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Search Publications

NIST Authors in Bold

Displaying 17376 - 17400 of 73697

Towards Reproducible Ring Resonator Based Temperature Sensors

September 1, 2015
Author(s)
Nikolai Klimov, Michaela Berger, Zeeshan Ahmed
In recent years photonic devices have emerged as a powerful tool for developing novel, high-sensitivity sensors. In particular, tremendous progress has been reported in developing photonic temperature sensors using a wide variety of materials including

Validation of Fire Models Applied to Nuclear Power Plant Safety

September 1, 2015
Author(s)
Kevin B. McGrattan, Richard D. Peacock, Kristopher J. Overholt
The paper highlights key components of a fire model validation study conducted by the U.S. Nuclear Regulatory Commission and the Electric Power Research Institute. These include the selection of fire phenomena of interest to nuclear power plant safety, the

Voltage Metrology Using a Quantum AC Standard

September 1, 2015
Author(s)
Thomas E. Lipe, Joseph R. Kinard Jr., Yi-hua Tang, Samuel P. Benz, Charles J. Burroughs, Paul D. Dresselhaus
We report on the use of a quantum-based AC voltage standard for ac-dc difference metrology at the National Institute of Standards and Technology (NIST). The paper describes the characterization of the output transmission line, and the methods used to

Design of MEMS vision tracking system based on a micro fiducial marker

August 31, 2015
Author(s)
Yong Sik Kim, Yang Seung Ho, KwangWoong Yang, Nicholas Dagalakis
In this study, a MEMS-based vision tracking system is developed based on micro fiducial markers. The vision tracking system recognizes the predetermined patterns of the micro-scale fiducial markers and calculates the position and rotation of the MEMS

Large-scale core-level Bethe-Salpeter equation calculations

August 31, 2015
Author(s)
Keith Gilmore, John Vinson, Eric L. Shirley, David Prendergast, Chaitanya D. Pemmaraju, Josh J. Kas, John J. Rehr, Fernando D. Vila
We present an efficient implementation of the Bethe-Salpeter equation (BSE) method for obtaining core-level spectra including x-ray absorption (XAS), x-ray emission (XES), and both resonant and non-resonant inelastic x-ray scattering spectra (N/RIXS)

Modest proposals for improving biometric recognition papers

August 31, 2015
Author(s)
James R. Matey, George W. Quinn, Patrick J. Grother, Elham Tabassi, Craig I. Watson, James L. Wayman
We present practical recommendations for improving the clarity, transparency, and usefulness of many biometric papers. Several of the recommendations can be enabled by preparing a publicly available library of state of the art Receiver Operating

Neutron Investigation of the Magnetic Scattering in an Iron-based Ferromagnetic Superconductor

August 31, 2015
Author(s)
Jeffrey W. Lynn, Xiuquan Zhou, Christopher K. H. Borg, Shanta R. Saha, Johnpierre Paglione, Efrain E. Rodriguez
Neutron diffraction and small angle scattering experiments have been carried out on the double-isotopic polycrystalline sample ( 7Li 0.82Fe 0.18OD)FeSe. Profile refinements of the diffraction data of a=3.7827 A and c=9.1277 A at 4 K, in the ferromagnetic

Reconfigurable Data Driven Virtual Machine Tool: Geometric Error Modeling and Evaluation

August 31, 2015
Author(s)
Ronnie R. Fesperman Jr., Shawn P. Moylan, Gregory W. Vogl, M A. Donmez
Standards communities are actively working to establish robust machining and measurement tests used to evaluate the machining performance of 5-axis machining centers through the direct and indirect measurement of the simultaneous motions of all five axes

SYNTHESIS AND PROPERTIES OF THERMOPLASTIC POLYURETHANES WITH ISOSORBIDE CHAIN EXTENDER

August 28, 2015
Author(s)
Fan Zhang, Ivan Javni, Olivera Bili?, Nikola Bili? , Zoran S. Petrovic, Jan Ilavsky
Isosorbide, a renewable diol derived from starch, was used in combination with butane diol or alone as the chain extender in two series of thermoplastic polyurethanes with 50 and 70% soft segment concentration (SSC). Polyurethanes with 50% SSC based on

Multiferroicity in Doped Hexagonal LuFeO 3

August 27, 2015
Author(s)
Steven M. Disseler, Xuan Luo, Bin Gao, Yoon Seok Oh, Rongwei Hu, Yazhong Wang, Dylan Quintana, Alexander Zhang, Qingzhen Huang, June W. Lau, Rick L. Paul, Jeffrey W. Lynn, Sang-Wook Cheong, William D. Ratcliff
The hexagonal phase of LuFeO 3 is a rare example of a multiferroic material possessing a weak ferromagnetic moment, which is predicted to be switchable by an electric field. We stabilize this structure in bulk form through Mn and Sc doping, and determine

Substitutional Doping in Nanocrystal Superlattices

August 27, 2015
Author(s)
Aaron C. Johnston-Peck, Matteo Cargnello, Benjamin T. Diroll, Eric Wong, Bianca Datta, Divij Damodar, Vicky V. Doan-Nguyen, Andrew A. Herzing, Cherie R. Kagan, Christopher B. Murray

Thermographic Measurements of the Commercial Laser Powder Bed Fusion Process at NIST

August 27, 2015
Author(s)
Brandon M. Lane, Shawn P. Moylan, Eric P. Whitenton, Li Ma
Measurement of the high-temperature melt pool region in the laser powder bed fusion (L-PBF) process is a primary focus of researchers to further understand the dynamic physics of the heating, melting, adhesion, and cooling which define this commercially

High Throughput Screening of Substrates for Synthesis and Functionalization of 2D Materials

August 26, 2015
Author(s)
Arunima Singh, Albert Davydov, Kiran Mathew, Richard G. Hennig, Francesca M. Tavazza
Several 2D materials have been synthesized experimentally, but many theoretically predicted 2D materials are yet to be synthesized. Here, we will review a density-functional theory based framework to enable high-throughput screening of suitable substrates

Wetting-Dewetting and Dispersion-Aggregation Transitions are Distinct for Polymer Grafted Nanoparticles in Chemically Dissimilar Polymer Matrix

August 26, 2015
Author(s)
Tyler B. Martin, Katrina Irene S. Mongcopa, Rana N. Ashkar, Paul Butler, Ramanan Krishnamoorti, Arthi Jayaraman
Simulations and experiments are conducted on polymer mixtures (or blends) containing polymer grafted nanoparticles in a chemically distinct polymer matrix, where the graft and matrix polymers exhibit attractive enthalpic interactions. Both coarse-grained

Direct Observation of Critical Adsorption on Colloidal Particles

August 25, 2015
Author(s)
Christopher E Bertrand, P. D. Godfrin, Yun Liu
Despite the fundamental role adsorbed solvent layers play in generating critical Casimir forces between colloidal particles, the structure of these layers has yet to be directly determined. Using small-angle neutron scattering ,we have measured critical

Re-Certification of SRM 2492: Bingham Paste Mixture for Rheological Measurements

August 25, 2015
Author(s)
Chiara F. Ferraris, Alex Olivas, William F. Guthrie, Blaza Toman
Rheological measurements are often performed using a rotational rheometer. In this type of rheometer, the tested fluid is sheared between two surfaces, one of which is rotating [1]. Usually, an angular velocity is imposed on the fluid (through the rotating
Displaying 17376 - 17400 of 73697
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