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Search Publications

NIST Authors in Bold

Displaying 9226 - 9250 of 73697

Characterization of Zinc Carboxylates in an Oil Paint Test Panel

September 25, 2019
Author(s)
Christine Romano, Thomas Lam, G. Asher Newsome, Joshua A. Taillon, Nicole Little, Jia-sun Tsang
Zinc (carboxylate) soaps, formed by reactions between zinc oxide (ZnO) and fatty acids in a drying oil, are known to cause deterioration in the paint layers of modern and contemporary oil paintings. This study investigates zinc carboxylates that developed

Effects of Al-Si Coating and Zn Coating on the Hydrogen Uptake and Embrittlement of Ultra-High Strength Press-Hardened Steel

September 25, 2019
Author(s)
Kyoung Rae Jo, Lawrence Cho, Dimas H. Sulistiyo, Eun Jung Seo, Seong Woo Kim, Bruno C. De Cooman
Press-hardened steel (PHS), used for automotive safety-related structure parts, is sensitive to hydrogen embrittlement due to its martensitic microstructure. Hydrogen is introduced in PHS during the hot press forming (HPF) process, by an atmospheric

Nonlinear Silicon waveguides produce tunable frequency combs spanning 2.0-8.5 ?m

September 25, 2019
Author(s)
Nima Nader, Abijith S. Kowligy, Jeffrey T. Chiles, Eric J. Stanton, Henry R. Timmers, Alexander J. Lind, Kimberly Briggman, Scott Diddams, Flavio Caldas da Cruz, Richard Mirin, Sae Woo Nam, Daniel M. Lesko
We present fully air clad suspended-silicon waveguides for efficient nonlinear interactions limited only by the silicon transparency. Novel fork-shaped couplers provide efficient input ( 2 dB) and broadband 3 dB output coupling spanning 6.0-8.5 υm

A Century of WWV: 100th Anniversary Commemoration

September 24, 2019
Author(s)
Glenn K. Nelson
WWV was established as a radio station on October 1, 1919 with the issuance of the call letters by the U.S. Department of Commerce. This paper will observe the upcoming 100th anniversary of that event by exploring the events leading to the founding of WWV

Categorization Errors for Data Entry in Maintenance Work-Orders

September 24, 2019
Author(s)
Thurston B. Sexton, Melinda Hodkiewicz, Michael P. Brundage
In manufacturing, there is a significant push toward the digitization of processes and decision making, by increasing the level of automation and networking via cyber-physical systems, and machine learning methods that can parse useful patterns from these

Measurements and Modeling Thermophysical Properties of Lubricants

September 24, 2019
Author(s)
Marcia L. Huber
Slides for presentation at SAE E-34 Propulsion Lubricants Committee meeting that discuss project comprised of measurements and modeling to provide thermophysical properties of a lubricant that meets military specification MIL-PRF-23699

Ultrathin Interfacial Layer with Suppressed Room Temperature Magnetization in Magnesium Aluminum Ferrite Thin Films

September 24, 2019
Author(s)
Jacob J. Wisser, Satoru Emori, Lauren Riddiford, Aaron Altman, Peng Li, Krishnamurthy Mahalingam, Brittany T. Urwin, Brandon M. Howe, Michael R. Page, Alexander Grutter, Brian Kirby, Yuri Suzuki
Low-damping magnetic oxide thin films with small thicknesses are essential for efficient insulator spintronic devices, particularly those driven by spin torques effects. Here, we investigate depth-resolved compositional and magnetic properties of epitaxial

Hot isostatic pressing (HIP) to achieve isotropic microstructure and retain as-built strength in additive manufacturing titanium alloy (Ti-6Al-4V)

September 23, 2019
Author(s)
Jake T. Benzing, Nikolas W. Hrabe, Timothy P. Quinn, Ryan M. White, Ross A. Rentz, Magnus Ahlfors
Hot isostatic pressing (HIP) treatments are used to seal internal porosity because defects exist in as-built Ti-6Al-4V parts produced by electron beam melting powder bed fusion. Standard HIP treatment of Ti-6Al-4V parts reduces internal porosity but

Near-infrared photonic phase-change properties of transition metal ditellurides.

September 23, 2019
Author(s)
Albert Davydov, Sergiy Krylyuk, Yifei Li, Akshay Singh, Rafael Jaramillo
We use the (Mo,W)Te2 system to explore the potential of transition metal dichalcogenides (TMDs) as phasechange materials for integrated photonics. We measure the complex optical constant of MoTe2 in both the 2H and 1T’ phases by spectroscopic ellipsometry

ROTDIF-web and ALTENS: GenApp-based Science Gateways for Biomolecular Nuclear Magnetic Resonance (NMR) Data Analysis and Structure Modeling

September 23, 2019
Author(s)
Yuexi Chen, Cheol Jeong, Alexey Savelyev, Susan T. Krueger, Joseph E. Curtis, Emre H. Brookes, David Fushman
Proteins and nucleic acids participate in essentially every biochemical process in living organisms, and the elucidation of their structure and motions is essential for our understanding how these molecular machines perform their function. Nuclear Magnetic

Strain Shifts under Stress-controlled Oscillatory Shearing in Theoretical, Experimental and Structural Perspectives: Application to Probing Zero-Shear Viscosity

September 23, 2019
Author(s)
Johnny Ching-Wei Lee, Yu-Tong Hong, Kathleen Weigandt, Elizabeth Kelley, Hyunjoon Kong, Simon A. Rogers
Strain response under stress-driven oscillatory shearing could shift from the origin. The phenomenology is experimentally confirmed with entangled polymer-like micelles and polyethylene oxide solutions. A theory of strain shifting is provided based on the

Exceeding the Sauter-Schwinger limit of pair production with a quantum gas

September 21, 2019
Author(s)
Alina M. Pineiro Escalera, Mingwu Lu, Dina Genkina, Ian Spielman
We quantum-simulated particle-antiparticle pair production with a bosonic quantum gas in an optical lattice by emulating the requisite 1d Dirac equation and uniform electric field. We emulated field strengths far in excess of Sauter-Schwinger's limit for

Report from the STRAND Working Group on the 2019 STR Sequence Nomenclature Meeting

September 21, 2019
Author(s)
Katherine Gettings, David Ballard, Martin Bodner, Lisa Borsuk, Jonathan King, Walther Parson, Christopher Phillips
This report summarizes topics discussed at the STR sequence nomenclature meeting hosted by the STRAND Working Group in April 2019. Invited attendees for this meeting included researchers known-to-us to be developing STR sequence-based nomenclature schemata

A review of protocols for Fiducial Reference Measurements of water-leaving radiance for validation of satellite remote sensing data over water

September 20, 2019
Author(s)
Kevin Ruddick, Emmanuel Boss, Alexandre Castagna, Robert Frouin, Alex Gilerson, Martin Hieronymi, B. Carol Johnson, Joel Kuusk, Zhongping Lee, Michael Ondrusek, Viktor Vabson, Riho Vendt, Kenneth Voss, Giuseppe Zibordi
This paper reviews the state of the art of protocols for measurement of water-leaving radiance in the context of Fiducial Reference Measurements (FRM) of water reflectance for satellite validation. Measurement of water reflectance requires the measurement

Estimating real-time infiltration for use in residential ventilation control

September 19, 2019
Author(s)
Lisa C. Ng, Stephen M. Zimmerman, Jeremy Good, Brian Toll, Steven J. Emmerich, Andrew K. Persily
Minimum outdoor air ventilation rates specified in standards such as ASHRAE Standard 62.2 are generally based on envelope airtightness, building floor area, geographical location, and number of occupants. ASHRAE Standard 62.2 allows for a constant

Machine Learning based Continuous Knowledge Engineering for Additive Manufacturing

September 19, 2019
Author(s)
Hyunwoong Ko, Yan Lu, Paul W. Witherell, Ndeye Y. Ndiaye
Additive manufacturing (AM) assisted by a digital twin is expected to revolutionize the realization of high-value and high-complexity functional parts on a global scale. With machine learning (ML) introduced in the AM digital twin, AM data are transformed
Displaying 9226 - 9250 of 73697
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