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NIST Authors in Bold

Displaying 3576 - 3600 of 143737

Crystallization Kinetics in an Immiscible Polyolefin Blend

December 12, 2022
Author(s)
Derek Huang, Anthony Kotula, Chad R. Snyder, Kalman Migler
Motivated by the problem of brittle mechanical behavior in recycled blends of high density polyethylene (HDPE) and isotactic polypropylene (iPP), we employ optical microscopy, rheo-Raman, and differential scanning calorimetry (DSC) to measure the

Determination of the Gravitational Constant Using a BIPM Balance

December 12, 2022
Author(s)
Stephan Schlamminger, Leon Chao, Vincent Lee, David B. Newell, Clive Speake
With the torsion balance developed at the Bureau International des Poids et Mesures (BIPM), the Newtonian constant of gravitation, $G$, can be measured with two methods. In the Cavendish method, the external gravitational torque is obtained from the

Development of an Improved Standard Reference Material for Folate Vitamers in Human Serum

December 12, 2022
Author(s)
Johanna Camara, Jeanita Pritchett, Yasmine Daniels, Mary Bedner, Michael Nelson, Mark Lowenthal, Zia Fazili, Christine Pfeiffer, Karen W. Phinney, Katherine E. Sharpless, Lane C. Sander, Katrice Lippa, James H. Yen, Adam Kuszak, Stephen Wise
The US National Institute of Standards and Technology (NIST) developed a Standard Reference Material® (SRM®) 3949 Folate Vitamers in Frozen Human Serum to replace SRM 1955 Homocysteine and Folate in Human Serum. The presence of increased endogenous levels

Gas Flow Standards and Their Uncertainty

December 12, 2022
Author(s)
John D. Wright, Aaron Johnson, Michael R. Moldover, Shin-ichi Nakao
We review diverse types of gas flow standards that are used to calibrate other gas flow meters. For each type of standard, we describe the principles of its operation and at least one hardware example. We identify the practical limits of the example's

High-Fidelity State Preparation, Quantum Control, and Readout of an Isotopically Enriched Silicon Spin Qubit

December 12, 2022
Author(s)
Adam Mills, Charlie Guinn, Michael Gullans, Mayer Feldman, Anthony Sigillito, M. Rakher, J. Kerckhoff, A. C. Jackson, Jason Petta
Quantum systems must be prepared, controlled, and measured with high fidelity in order to per- form complex quantum algorithms. Control fidelities have greatly improved in silicon spin qubits, but state preparation and readout fidelities have generally

New Ritz Wavelengths and Transition Probabilities for Parity-Forbidden, Singly Ionised Nickel [Ni ii] Lines of Astrophysical Interest Christian P.

December 12, 2022
Author(s)
Christian P. Clear, Peter Uylings, Ton Raassen, Gillian Nave, Juliet C. Pickering
We report accurate Ritz wavelengths for parity-forbidden [Ni ii] transitions, derived from energy levels determined using high-resolution Fourier transform spectroscopy. Transitions between the 17 lowest Ni ii energy levels of even parity produced Ritz

Radiation Pressure-based Laser Metrology Implementing an Electrostatic Force Balance

December 12, 2022
Author(s)
Brian Simonds, Kyle Rogers, Sven Schulze, David Newell, Gordon Shaw, Paul A. Williams, John Lehman
A primary standard force sensor and laser power meter are combined to achieve laser power traceability to Planck's constant by means of radiation pressure. We assess the statistical uncertainty for measurements of 1 kW, 2 kW, and 5 kW using an

Ultra-low loss quantum photonic circuits integrated with single quantum emitters

December 12, 2022
Author(s)
Ashish Chanana, Hugo Larocque, Renan Moreira, Jacques Carolan, Biswarup Guha, Emerson Goncalves De Melo, Vikas Anant, Jin Dong Song, Dirk Englund, Daniel Blumenthal, Marcelo Davanco, Kartik Srinivasan
Photon-based photonic quantum information systems require both scalable ultra-low loss photonic circuits and high-flux sources of single-photons. Direct integration of these sources and circuits is critical to realizing quantum systems that are scalable

Wind-Driven Fire Spread to a Structure from Fences and Mulch

December 12, 2022
Author(s)
Kathryn Butler, Erik L. Johnsson, Alexander Maranghides, Shonali Nazare, Marco G. Fernandez, Rachel McIntyre, William Saar, Mariusz Zarzecki, Wei Tang, Eric Auth, Michael Pryor, Colin McLaughlin
A series of field experiments was conducted to examine the effects on fire spread toward a structure for combustible fences and mulch under conditions that may be encountered in a wildland-urban interface (WUI) fire. The fire behavior of a variety of

A Macroscopic Mass From Quantum Behavior In An Integrated Approach

December 10, 2022
Author(s)
Frank Seifert, Alireza Panna, Lorenz Keck, Leon Chao, Shamith Payagala, Dean G. Jarrett, Dipanjan Saha, Randolph Elmquist, Stephan Schlamminger, Albert Rigosi, David B. Newell, Darine El Haddad
The revision of the International System of Units (SI) on May 20th, 2019, has enabled new improved experiments to consolidate and simplify electrical and mechanical metrology currently underway. Historically within the SI, the definition of energy was only

Supply Chain Assurance: Validating the Integrity of Computing Devices

December 9, 2022
Author(s)
Nakia R. Grayson, Murugiah Souppaya, Andrew Regenscheid, Tim Polk, Christopher Brown, Karen Scarfone, Chelsea Deane
Product integrity and the ability to distinguish trustworthy products is a critical foundation of C-SCRM. Authoritative information regarding the provenance and integrity of components provides a strong basis for trust in a computing device whether it is a
Displaying 3576 - 3600 of 143737
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