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Displaying 1351 - 1375 of 2521

Theory of Spin Polarized Metastable Atom De-excitation Spectroscopy; Ni-He

January 1, 1990

Author(s)

David R. Penn, S Apell

… at the Fermi energy and far from the Ni surface is -20%. …

Study of the Ignition Inhibiting Properties of Compressed Air Foam.

October 3, 1988

Author(s)

Daniel M. Madrzykowski

… initial retention efficiency for the foam of approximately 20 times the efficiency of water. This type of foam may have …

Analysis and Prediction of Air Leakage Through Door Assemblies

June 9, 1988

Author(s)

Daniel Gross, W L. Haberman

… by use of the relationship shows agreement within 20 percent. The volumetric flow of heated air through simple …

Fractographic Analysis of All Ceramic Restorations

September 1, 2006

Author(s)

George D. Quinn, Janet Quinn, Susanne Scherrer

… Transactions of the Academy of Dental Materials, Vol. 20, pages: 87-102 …

Surface photooxidation of polypropylene-based photovoltaic backsheets: A comprehensive spectroscopic investigation

December 8, 2024

Author(s)

Karissa Jensen, Ashlee Aiello, Stefan Mitterhofer, Chiara Barretta, Gernot Oreski, Christopher Stafford, Xiaohong Gu

… environmental conditions: 75°C and 50% RH, 75°C and 20% RH, and 65°C and 20% RH. The total UV dose (295 nm – 400 nm) for each film was …

Database-Assisted Design: Performance-Based Approach for Dynamically Sensitive Steel and Reinforced Concrete Structures

October 31, 2024

Author(s)

Daniel Rhee, DongHun Yeo, Mehedy Mashnad, Brian Carman, Charys Clay

This NIST Technical Note presents the User's Manual for the DAD_PBD version 2.0 software, a user-friendly tool for the advanced structural design of dynamically sensitive steel and reinforced concrete buildings. The software utilizes the Database-Assisted

Pre-Conceptual Design of the NIST Neutron Source

April 16, 2023

Author(s)

Dagistan Sahin, Osman Celikten, Jeremy Cook, Abdullah Weiss, Thomas Newton, David Diamond, Charles F. Majkrzak, Hubert King, Joy Shen, Anil Gurgen, Lap-Yan Cheng, Peter Kohut, Cihang Lu, Athi Varuttamaseni

… The National Bureau of Standards Reactor (NBSR), a 20 MW thermal power Material Test Reactor (MTR), is located … compact reactor with a heavy water reflector to operate at 20 MW thermal power. The NNS core is primarily optimized to …

Assessment of Serum Total 25-Hydroxyvitamin D Assays for Vitamin D External Quality Assessment Scheme (DEQAS) Materials Distributed at Ambient and Frozen Conditions

November 9, 2021

Author(s)

Johanna Camara, Christopher T. Sempos, Emma L. Williams, Graham D. Carter, Julia C. Jones, Carolyn Burdette, Grace Hahm, Federica Nalin, David L. Duewer, Adam J. Kuszak, J. M. Betz, Andrew Hoofnagle, Pierre Lukas, E. Cavalier, Ramon Durazo-Arvizu, P. M. Crump, Christian Popp, Christian Beckert, Glen Van Slooten, Patrick Gradon, Joelle Morgand, Sarah Paul, Bruno Emanuelli, Angelo Maggio, Fiona Ivison, Ralf Fischer, Jody M. van den Ouweland, Chung S. Ho, Emmett W. Law, Jean-Nicolas Simard, Renaud Gonthier, Brett Holmquist, Manisha S. Patwardhan, Marcelo C. Batista, Heather Pham, Sarah Meadows, Eugene Jansen, Dilshad A. Khan, Kimberly Robyak, Mark Kilbane, Neil Parker, Vincent Chen, Robert Fitzgerald, Sohail Mushtaq, Michael W. Clarke, Norma Breen, Christine Simpson, Stephen A. Wise

… are instructed to store the samples frozen at −20 °C or lower after receipt; however, the samples are … 34 sets of results for the measurement of 25(OH)D using 20 ligand binding assays and 14 liquid chromatography–tandem …

Development of Standard Reference Material (SRM) 2973 Vitamin D Metabolites in Frozen Human Serum (High Level)

July 24, 2017

Author(s)

Susan Tai, Michael Nelson, Brian Lang, Karen W. Phinney, Lane C. Sander, James H. Yen, J. M. Betz, Christopher T. Sempos, Stephen Wise

… SRMs with values assigned for total 25(OH)D between 20 nmol/L to 80 nmol/L. Values were assigned for … values of 1.59 ± 0.05 nmol/L for 25(OH)D2 and 5.23 ± 0.20 nmol/L for 3-epi-25(OH)D3. In addition, a candidate RMP … values for 24R,25(OH)2D3 were assigned to SRM 2973 (7.51 nmol/L ± 0.26 nmol/L) and SRM 972a Level 1 (6.38 nmol/L …

The National Strategy for Trusted Identities in Cyberspace (Enhancing Online Choice, Efficiency, Security, and Privacy through Standards)

November 1, 2011

Author(s)

Jeremy A. Grant

… you were never helpful: when we first went online some 20 years ago, you were downright essential. But our old … password requirements impose on most individuals to craft 20 to 30 passwords with letters, numbers, symbols, and such …

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

… photoreflectance PR spectroscopy at temperatures between 20 and 300 K. The films were approximately 0.5 m thickand had … located 0.3004 0.0101 eV above the conduction-band edge at 20 K and0.3286 0.0089 eV above the conduction-band edge at …

Distribution of Earthquake Input Energy in Structures

January 1, 2003

Author(s)

P Khashaee, B Mohraz, Fahim H. Sadek, Hai S. Lew, John L. Gross

… of input energy for a one- and a five-story building using 20 accelerograms, ten with short and ten with long duration … damping and semi-active control are examined using the 20 accelerograms. The results show that: 1) the distribution …

Electron transport in bilayer graphene nanoconstrictions patterned using atomic force microscope nanolithography

March 20, 2025

Author(s)

Robert Rienstra, Nishat Sultana, En-Min Shih, Evan Stocker, Kenji Watanabe, Takashi Taniguchi, Curt Richter, Joseph Stroscio, Nikolai Zhitenev, Fereshte Ghahari Kermani

… allows for the creation of constrictions as narrow as 20 nm. While larger constrictions exhibit an enhanced energy …

Economics of Digital Twins: Costs, Benefits, and Economic Decision Making

October 30, 2024

Author(s)

Douglas Thomas

… varying key factors of this estimate by -50 % and +20 % (i.e., biasing it downwards) and assuming that digital …

Development of Reference Material 8103: Adamantane for Subambient DSC Temperature and Enthalpy Calibration

September 13, 2024

Author(s)

Tara Fortin, Amanda Koepke, Jolene Splett

… of RM 8103 has been determined to be equal to (-64.58 ± 0.20) °C, while the enthalpy of transition has been determined …

Frequency combs for precision synthesis and characterization of atomic standards.

October 16, 2023

Author(s)

Tara Fortier

… Over the past 20 years optical frequency combs, with atomic clocks, have …

2022 Cybersecurity & Privacy Annual Report

May 30, 2023

Author(s)

Patrick D. O'Reilly, Kristina Rigopoulos, Larry Feldman, Greg Witte

During Fiscal Year 2022 (FY 2022) – from October 1, 2021, through September 30, 2022 –the NIST Information Technology Laboratory (ITL) Cybersecurity and Privacy Program successfully responded to numerous challenges and opportunities in security and privacy

Ultrafast ID-VG Technique for Reliable Cryogenic Device Characterization

March 21, 2023

Author(s)

Pragya Shrestha, Akin Akturk, Brian Hoskins, Advait Madhavan, Jason Campbell

… accurate fast I-V and transconductance transients down to 20 ns for devices operating at or below 12 K. The combination …

Tensile Tests at 77 K and 4 K on 316L Stainless Steel Welded Plates

July 19, 2022

Author(s)

Dash Weeks, Nicholas Derimow, Jake Benzing

… the strongest two welds (W4 and W2) exhibiting a nearly 20 % difference in 4 K ultimate tensile strength when …

The Irradiance Instrument Subsystem (IRIS) on the Airborne-Lunar Spectral Irradiance (Air-LUSI) Instrument

March 23, 2022

Author(s)

Steven Grantham, Thomas C. Larason, Clarence Zarobila, Stephen Maxwell, John Woodward, Kevin Turpie, S. Andrew Gadsden

… ER-2 aircraft, which can fly at altitudes of approximately 20 km above sea level. Air-LUSI measurements, corrected for …

Atomic Transition Probabilities for DyI and DyII

October 12, 2021

Author(s)

M E. Wickliffe, James E. Lawler, Gillian Nave

Atomic transition probabilities for 915 spectral lines of neutral and singly ionized dysprosium are reported. Typical uncertainties are less than +/- 10%. Branching fractions, measured using the 1.0 m Fourier transform spectrometer (FTS) at the National

Enhance Dynamics in the Anomalous Melting Regime of DMPG Lipid Membranes

October 16, 2020

Author(s)

Elizabeth Kelley, Michihiro Nagao, Paul Butler, Lionel Porcar, Bela Farago

… its anomalous phase transition that occurs over a 12 °C to 20 °C wide temperature window. Our results reveal that the …

High-brightness lasing at submicrometer enabled by droop-free fin light-emitting diodes (LEDs)

August 14, 2020

Author(s)

Robin P. Hansen, Amit K. Agrawal, Michael Shur, Jerry Tersoff, Babak Nikoobakht, Yuqin Zong

… the LEDs transition to lasing, with brightness over 20 W. Despite a light extraction efficiency of only 15%, …

Path-Integral Calculation of the Second Dielectric and Refractivity Virial Coefficients of Helium, Neon, and Argon

August 6, 2020

Author(s)

Giovanni Garberoglio, Allan H. Harvey

We present a method to calculate dielectric and refractivity virial coefficients using the path-integral Monte Carlo formulation of quantum statistical mechanics and validate it by comparing our results with equivalent calculations in the literature and

Mid-Infrared Dual Frequency Comb Spectroscopy for Combustion Analysisin the 2.8 to 5 micron Spectral Region

June 7, 2020

Author(s)

Ian Coddington, Nathan Newbury, Greg Rieker, Amanda S. Makowiecki, Daniel Herman, Nazanin Hoghooghi, Elizabeth F. Strong, Gabriel Ycas, Fabrizio Giorgetta, Ryan Cole, Caelan Lapointe, Jeff Glusman, John Daily, Peter E. Hamlington

… combustion of wood samples. Specifically, we measure 20-second time-resolved mole fractions of CH4, H2O, two …

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