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Displaying 851 - 875 of 2521

An Investigation of the Temperature and Strain-Rate Effects on Strain-to-Failure of UHMWPE Fibers

October 18, 2016

Author(s)

Don Jenket II, Amanda L. Forster, Nicholas G. Paulter Jr., Tusit Weerasooriya, Carey A. Gunnarsson, Mohamad Al-Sheikhly

… between 10-3 s-1 to 550 s-1 and eleven temperatures from 20 °C. to 148 °C. A non-failure boundary is created by … there was minor change in the strain-to-failure from 20°C to 145 °C indicating strain-rate is the dominant factor. …

A Comparative Analysis of NIST Charpy Machines and Internal Reference Materials

August 23, 2016

Author(s)

Enrico Lucon, Raymond L. Santoyo

… on historical data, collected over a period of more than 20 years, and newly obtained test results from almost 300 … delivers consistently lower energy values in the 15 J - 20 J range. This appears to be due to its higher stiffness …

Stochastic behavior of nanoscale dielectric wall buckling

March 16, 2016

Author(s)

Lawrence H. Friedman, Igor Levin, Robert F. Cook

… The dielectric walls, approximately 200 nm tall and 20 nm wide, consist of compliant, low dielectric constant … measurable quantity, and a shorter-scale (down to 20 nm) that treats buckling as a deterministic phenomenon. …

Development of an Ultra-Pure, Carrier-Free 209Po Solution Standard

July 23, 2015

Author(s)

Ronald Colle, Ryan P. Fitzgerald, Lizbeth Laureano-Perez

… (having a solution density of (1.032  0.002) g▪ mL-1 at 20 C) that are contained in 5-mL, flame-sealed, borosilicate …

Anchor Molecules Affect Structure and Properties of Tethered Bilayer Lipid Membranes. Unsaturation in the Alkyl Chains.

June 7, 2013

Author(s)

David J. Vanderah, Rima Budvytyte, Gintaras Valincius, Gediminas Niaura, Vladislava Voiciuk, Mindaugas Mickevicius, Haw-Zan Goh, Hilary Stauffer, Frank Heinrich, Siddharth Shenoy

… SAMs up to anchor/ME molar fraction ratios of 80 %/20 % and result in tBLMs that exhibit higher lipid diffusion …

Verification of the Back-EMF Method for Piston Velocity Measurements

July 10, 2012

Author(s)

Ray Radebaugh, Michael A. Lewis, Peter E. Bradley

… from the back-EMF method and the LVDT agree within 7 %. The laser position sensor showed abnormal behavior (20 % to 30 % deviations) for strokes less than about 20 % of full stroke. Agreement was within about 5 % at higher …

Mercury Stable Isotopes in Seabird Eggs Reflect a Gradient from Terrestrial Geogenic to Oceanic Mercury Reservoirs

April 21, 2012

Author(s)

Russell D. Day, David G. Roseneau, Sylvain Berail, Keith A. Hobson, O.F.X Donard, Stacy S. Schuur, Rebecca S. Pugh, Amanda J. Moors, Stephen E. Long, Paul R. Becker

… δ13C values in eggs from within Norton Sound (-23.3 to -20.0 ) relative to the northern Bering Sea (-20.9 to -18.7) indicate a major terrestrial C source is associated with …

Commutability of NIST SRM 1955 Homocysteine and Folate in Frozen Human Serum With Selected Total Homocysteine Immunometric or Enzymatic Assays

March 1, 2008

Author(s)

B C. Nelson, Christine M. Pfeiffer, Ming Zhang, David L. Duewer, Katherine E. Sharpless, Katrice Lippa

… commutability of SRM 1955. Methods: tHcy was measured in 20 patient sera and in 3 levels of SRM 1955 using selected … (CV) was 5% for patient specimens and ranged from 3% to 7% for SRM 1955 samples. The mean intraassay imprecision (CV) … of assay accuracy, ranged from 0.29 to 7.71 and from 0.20 to 2.22 for patient specimens and SRM 1955 samples, …

Phase behavior of block co-poly (ethylene oxide-butylene oxide), E 18 B 9 in water, by small angle neutron scattering

August 1, 2005

Author(s)

A I. Norman, D L. Ho, Alamgir Karim, Eric J. Amis

… different concentrations (0.025 %, 0.05 %, 0.5 %, 5 % and 20 % by mass fraction) at eight different temperatures (10 C, 20 C, 30 C, 40 C, 50 C, 65 C, 80 C and 90 C). At low …

Understanding and Optimizing the MALDI Process Using a Heated Sample Stage: a 2,5-Dihydroxybenzoic Acid Study

January 1, 2004

Author(s)

Mark Arnould, William E. Wallace, R Knochenmuss

… The graph of total ion production remains constant from 20?C until 60?C, where it increases almost exponentially and …

The Role of Hydrogen Bonding in Transition-State Stabilization by Uracil-DNA Glycosylase

February 1, 2000

Author(s)

A C. Drohat

… negative charge on uracil O2 in the transition state by 20 kJ/mol (Drohat, A.C. et al. Biochemistry 1999, 38, … 3.4 units lower than for free uracil, corresponding to 20 kJ/mol of stabilization energy by the enzyme. Thus, … 0.1), solvent exchange rate and protection factor (kex = 7 s-1 and P.F. = 500), and change in 15N chemical shift upon …

Development of Standard Reference Materials for Diagnosis of P53 Mutations; Analysis by Slab Gel Single Strand Conformation Polymorphism

February 1, 1998

Author(s)

C D. O'Connell, J Tian, A Juhasz, H M. Wenz, Donald H. Atha

… varied for each mutation examined. Subambient temperature (20 Celsius}) was preferable overall for discrimination of …

Four terminal-pair measurements of ceramic capacitors

June 28, 2024

Author(s)

Stephan Schlamminger, Yicheng Wang, Andrew Koffman, Jordan Love

… in the admittance in the frequency range from 100 kHz to 20 MHz. This measurement can be obtained with a vector …

Second harmonic generation in GaAs-on-insulator waveguides fabricated at the wafer-scale

March 18, 2020

Author(s)

Eric Stanton, Jeff Chiles, Nima Nader, Galan Moody, Nicolas Volet, Lin Chang, John E. Bowers, Sae Woo Nam, Richard Mirin

Second harmonic generation (SHG) is demonstrated with unprecedented efficiency for a single-pass device. Modal phase-matching in GaAs-on-insulator waveguides is used to convert a 2.0 µm TE pump to a 1.0 µm TM signal with an efficiency of 40 W−1 in a length

Subharmonic Entrainment of Kerr Breather Solitons

October 25, 2019

Author(s)

Daniel Cole, Scott Papp

… observed with intermediate finesse (F ∼ 30–40) for N up to 20, and we propose a way to realize higher entrainment ratios …

Improving Accuracy, Precision, Detection Limits, and Sample Throughput in PGAA Using Cold and Thermal Neutrons and Element Ratios

December 28, 2018

Author(s)

Rick Paul

… than a third of the time needed for TNPGAA alone, with a 20-30 improvement in detection limits. …

Josephson Arbitrary Waveform Synthesizer as Reference Standard for the Measurement of the Phase of Harmonics in Distorted Signals

July 7, 2018

Author(s)

Dimitrios Georgakopoulos, Ilya F. Budovsky, Samuel P. Benz, G. Gubler

In this work we use the Josephson arbitrary waveform synthesizer to provide traceability for the phase of the harmonics of a distorted waveform, relative to its fundamental. For distorted waveforms with rms values in the range from 0.154 V to 0.2 V and

Non-Resonant Valence-to-Core X-ray Emission Spectroscopy of Niobium

March 23, 2018

Author(s)

Bruce D. Ravel, A. J. Kropf, Dali Yang, Mengen Wang, Mehmet Topsokal, Deyu Lu, M. C. Stennett, N. C. Hyatt

… a strong ligand dependence, thus providing a sensitive 20 probe of the ligand environment about the niobium. …

Measurement Challenges and Metrology for Monitoring CO2 Emissions from Smokestacks Workshop Summary

January 20, 2016

Author(s)

Aaron N. Johnson, Rodney A. Bryant, Tamae M. Wong, James R. Whetstone, Eric Harman, Woong Kang, Keith A. Gillis, Hsin-Hung Lee, Iosif I. Shinder, Liang Zhang

… On April 20-21, 2015, NIST hosted a workshop that, through measurement …

Framework for Cloud Usability

August 2, 2015

Author(s)

Brian C. Stanton, Mary F. Theofanos, Karun P. Joshi

… experience. The framework includes five attributes and 20 elements that characterize this user experience. Generally …

On the Freezing Behavior and Diffusion of Water in Proximity to Single-supported Zwitterionic and Anionic Bilayer Lipid Membranes

July 22, 2014

Author(s)

A. Miskowiec, Z. N. Buck, M. C. Brown, H. Kaiser, F.Y. Hansen, G. M. King, H. Taub, R. Jiji, J.W. Cooley, Madhu Sudan Tyagi, S. O. Diallo, E. Mamontov, K. W. Herwig

… freezing transition near the anionic DMPG bilayer (δT 7- K) compared to zwitterionic DMPC (δT 20K) as wells as in …

Microwave Conductance of Semicontinuous Metallic Films from Coplanar Waveguide Scattering Parameters

May 6, 2013

Author(s)

Jan Obrzut, Oleg A. Kirillov

… waveguide configuration at frequencies of 100 MHz to 20 GHz. The presented model of the microwave network …

A Low-Power, High-Sensitivity Micromachined Optical Magnetometer

December 11, 2012

Author(s)

Rahul R. Mhaskar, Svenja A. Knappe, John E. Kitching

… pumps and interrogates the atoms. A sensitivity below 20 fΤ/√Hz is achieved in the frequency band from 15 Hz to 100 …

First Principles Phase Diagram Calculations for the Octahedral-Interstitial System ZrO(sub x), 0 less or greater X less or greater 0.5

November 27, 2012

Author(s)

Benjamin P. Burton, A Van de Walle

First principles based phase diagram calculations were performed for the octahedral-interstitial solid solution system $\alpha ZrO_{X}$~ $0 \leq X \leq 1/2$ ($\alpha Zr[~~]_{1-X}O_{X}$; [~~]=Vacancy). The cluster expansion method was used to do a ground

A gamma and X-ray dector for cryogenic, high magnetic field applications

July 13, 2012

Author(s)

Thomas R. Gentile, R L. Cooper, R. Alarcon, M J. Bales, E J. Beise, H Breuer, J. Byrne, T E. Chupp, Kevin J. Coakley, Maynard S. Dewey, Changbo Fu, Hans P. Mumm, Jeffrey S. Nico, B. O'Neill, K. Pulliam, Alan Keith Thompson, F E. Wietfeldt

… detected soft X-rays with energies between 0.2 keV and 20 keV with three large area APDs. The construction and …

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