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Displaying 2076 - 2100 of 143793

Liquid Piston Based on Molecular Springs for Energy Storage Applications

September 15, 2023
Author(s)
Mehdi Hashemi-Tilehnoee, Nikolay Tsirin, Victor Stoudenets, Yuriy Bushuev, Miroslaw Chorazewski, Mian Li, Dan Li, Juscelino Leao, Markus Bleuel, Pawel Zajdel, Elena Palomo Del Barrio, Yaroslav Grosu
Liquid piston is a method for pressure transmission used in a wide range of technologies. Currently, liquid piston is a passive element solely used to apply pressure to a working body. In this work, the concept of liquid piston based on molecular springs –

Report on High Energy Arcing Fault Experiments: Experimental Results from Medium-Voltage Bus Duct and Switchgear Enclosures

September 15, 2023
Author(s)
Gabriel Taylor, Anthony D. Putorti Jr., Scott Bareham, Christopher U. Brown, Wai Cheong Tam, Ryan Falkenstein-Smith, Stephen Fink, Michael Heck, Edward Hnetkovsky, Nicholas Melly, Kenneth Hamburger, Kenneth Miller
This report documents an experimental program designed to investigate high energy arcing fault (HEAF) phenomena for medium-voltage, metal-enclosed bus ducts and switchgear. This report covers full-scale laboratory experiments using representative nuclear

Using a BDI Agent to Represent a Human on the Factory Floor of the ARIAC 2023 Industrial Automation Competition

September 15, 2023
Author(s)
Leandro Buss Becker, Anthony Downs, Craig I. Schlenoff, Justin Albrecht, Zeid Kootbally, Angelo Ferrando, Rafael Cordoso, Michael Fisher
The "Agile Robotics for Industrial Automation Competition" (ARIAC) is an international robotic competition carried out in a simulated ROS2/Gazebo factory floor. Competitors control a robot, overcoming a range of agility challenges in this simulated

De-Identifying Government Datasets: Techniques and Governance

September 14, 2023
Author(s)
Simson L. Garfinkel, Joseph Near, Aref Dajani, Phyllis Singer, Barbara Guttman
De-identification is a general term for any process of removing the association between a set of identifying data and the data subject. This document describes the use of deidentification with the goal of preventing or limiting disclosure risks to

Vision on metal additive manufacturing: Developments, challenges and future trends

September 14, 2023
Author(s)
Alain Bernard, Jean-Pierre Kruth, Jian Cao, Gisela Lanza, Stefania Bruschi, Marion Merklein, Tom Vaneker, Michael Schmidt, John Sutherland, Alkan Donmez, Eraldo da Silva
Additive Manufacturing (AM) is one of the disruptive technologies to fabricate components, parts, assemblies or tools in various fields of application due to its main characteristics such as direct digital manufacturing, ability to offer both internal and

Comparison of Ice-on-Coil Thermal Energy Storage Models

September 13, 2023
Author(s)
Kalyan Ram Kanagala, Amanda Pertzborn
Data collected from the Intelligent Building Agents Laboratory (IBAL) at the National Institute of Standards and Technology (NIST) are used to develop a physics-based and four machine learning models of ice-on-coil thermal energy storage (TES): linear

Flame Propagation in Blends of R152a, R134a, and R-1234yf with Air

September 13, 2023
Author(s)
Dennis Kim, Valeri I. Babushok, Michael Hegetschweiler, Gregory T. Linteris
Laminar burning velocity measurements have been made using a constant volume experiment with dry air and the refrigerant R152a (CH3CHF2), pure and blended with R134a (CH2FCF3), or R1234yf (CF3CFCH2). The resulting burning velocity data deduced from the

Ab initio Calculation of Fluid Properties for Precision Metrology

September 12, 2023
Author(s)
Giovanni Garberoglio, Christof Gaiser, Roberto Maria Gavioso, Allan H. Harvey, Robert Hellmann, Bogumil Jeziorski, Karsten Meier, Michael R. Moldover, Laurent Pitre, Krzysztof Szalewicz, Robin Underwood
Recent advances regarding the interplay between ab initio calculations and metrology are reviewed, with particular emphasis on gas-based techniques used for temperature and pressure measurements. Since roughly 2010, several thermophysical quantities – in

CCQM_Retrospectoscope Reference Manual: A detailed reference to the CCQM_Retrospectoscope, a suite of graphical tools for the meta-analysis of measurement results from CCQM studies

September 12, 2023
Author(s)
David L. Duewer, Michael Nelson, Christina Cecelski
The CCQM_Retrospectoscope system combines a nominally complete database of results from Consultative Committee for the Amount of Substance: Metrology in Chemistry and Biology (CCQM) studies with a number of graphical tools for trying to make sense of the

Comparison of the detection efficiency calibration of a single-photon avalanche detector between NIST and PTB

September 12, 2023
Author(s)
Hristina Georgieva, Thomas Gerrits, Helmuth Hofer, Anouar Rahmouni, Oliver T. Slattery, Marco Lopez, Joshua Bienfang, Alan Migdall, Stefan Kueck
The detection efficiency of a commercial single-photon avalanche detector (SPAD) has been independently determined at two national metrology institutes, the National Institute of Standards and Technology (NIST) - USA and the Physikalisch-Technische

Repeatability of Contactless and Contact Fingerprint Capture

September 12, 2023
Author(s)
John M. Libert, Shahram Orandi, John Grantham, Kenneth Ko, Bruce Bandini
A new generation of contactless fingerprint capture devices has recently emerged. These devices provide the ability to capture a fingerprint without making physical contact with the finger. There is anecdotal evidence that the process of capturing a

Constraints on Proximity-Induced Ferromagnetism in a Dirac Semimetal (Cd3As2)/Ferromagnetic Semiconductor (Ga1-xMnxSb) Heterostructure

September 11, 2023
Author(s)
Arpita Mitra, Run Xiao, Wilson Yanez, Yongxi Ou, Juan Chamorro, Tyrel M. McQueen, Alexander Grutter, Julie A. Borchers, Michael R. Fitzsimmons, Timothy Charlton, Nitin Samarth
Breaking time-reversal symmetry in a Dirac semimetal Cd3As2 through doping with magnetic ions or by the magnetic proximity effect is expected to cause a transition to other topological phases (such as a Weyl semimetal). To this end, we investigate the

High-Power Radiation-Pressure-based Laser Metrology Using an Electrostatic Force Balance

September 11, 2023
Author(s)
Brian Simonds, Kyle Rogers, Sven Schulze, David Newell, Gordon Shaw, John Lehman, Paul A. Williams
A primary standard electrostatic force balance has been integrated into a multiple-reflection radiation pressure-based laser power meter capable of measuring kilowatts of optical power. We present optical power data at 0.1 kW, 1 kW, 2 kW, and 5 kW with the

Laser Power Accuracy of Additive Manufacturing Systems - A Round Robin Study

September 11, 2023
Author(s)
Brian Simonds, Kyle Rogers, Paul A. Williams
High power lasers are at the core of metal additive manufacturing (AM) systems and the accurate delivery of laser energy is critical to part performance. We have performed a round robin style survey of U.S. AM equipment across industry, academia, and

Non-flammable Low-GWP Refrigerant Blends to Replace HFC-134a

September 11, 2023
Author(s)
Harrison M. Skye, Piotr A. Domanski, Mark O. McLinden, Valeri I. Babushok, Ian Bell, Tara Fortin, Michael Hegetschweiler, Mark A. Kedzierski, Dennis Kim, Lingnan Lin, Gregory T. Linteris, Stephanie L. Outcalt, Vance (Wm.) Payne, Richard A. Perkins, Aaron Rowane
Non-flammable, lower global-warming-potential (GWP) refrigerants are needed to replace HFC-134a (GWP=1300) in military equipment. We previously used thermodynamic cycle simulations to screen 100 000+ refrigerant blends and identified 23 candidate
Displaying 2076 - 2100 of 143793
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