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Displaying 11001 - 11025 of 73893

A Comparison Between The Solution Properties of Knotted Ring and Star Polymers

October 31, 2018
Author(s)
Luis F. Vargas Lara, Beatriz Pazmino, Jack F. Douglas
We computationally investigate the solution properties of knotted flexible ring and star polymers by combining molecular dynamics simulation (MD) and path-integral calculations. In particular, we consider knotted rings having a minimal crossing number mc

A more efficient method for calibrating discrete element method parameters for simulations of metallic powder used in additive manufacturing

October 31, 2018
Author(s)
Stephen R. Geer, Michelle Bernhardt, Edward Garboczi, Justin Whiting, Alkan Donmez
Laser powder bed fusion (LPBF) is an additive manufacturing (AM) process that uses a high-power laser to selectively melt metal powder that has been spread, layer-by-layer, to create parts with highly complex features. Because of the strong influence that

Certifying Quantum Randomness by Probability Estimation

October 31, 2018
Author(s)
Emanuel H. Knill, Yanbao Zhang, Peter L. Bierhorst
We introduce probability estimation, a broadly applicable frameworkto certify randomness in a finite sequence of measurements subject to verifiable physical constraints and with respect to classical side information. Examples include randomness from single

Compositional Imaging and Analysis of Late Iron Age Glass from the Broborg Vitrified Hillfort, Sweden

October 31, 2018
Author(s)
Jamie Weaver, Scott A. Wight, Carolyn Pearce, John McCloy, Thomas Lam, Rolf Sjoblom, David Peeler, Michael Schweiger, Albert Kruger, Scott Whittaker, Edward Vicenzi
Numerous Iron Age hillforts were constructed throughout Europe on high ground to serve ancient settlements. The edifice walls of a small fraction of hillforts were vitrified as a result of high temperature activity, most likely to reinforce the walls

Performance Metrics and Test Methods for Robotic Hands (Draft)

October 31, 2018
Author(s)
Joseph A. Falco, Karl Van Wyk, Elena R. Messina
Increasing the flexibility and general-purpose applicability of robots is a longstanding goal. Several avenues of research are addressing these goals, ranging from integration of multiple sensors to allow robots to perceive their surroundings and adapt

Persistence of Electromagnetic Units in Magnetism

October 31, 2018
Author(s)
Ronald B. Goldfarb
The centimeter-gram-second system of electromagnetic units (EMU) has been used in magnetism since the late 19th century. The International System of Units (SI), a successor to Giorgi's 1901 meter- kilogram-second system, was adopted by the General

NIST Conference Papers: Fiscal Year 2016

October 30, 2018
Author(s)
Andrea M. Medina-Smith, Kathryn Miller, Karen J. Wick
NIST is committed to the idea that results of federally funded research are a valuable national resource and a strategic asset. To the extent feasible and consistent with law, agency mission, resource constraints, and U.S. national, homeland, and economic

Mapping Electron Transfer at MoS2 using Scanning Electrochemical Microscopy

October 29, 2018
Author(s)
Nicole L. Ritzert, Veronika Szalai, Thomas P. Moffat
Understanding the role of macroscopic and atomic defects in the interfacial electron transfer properties of layered transition metal dichalcogenides is important in optimizing their performance in energy conversion and electronic devices. Means of

The Complexity and Verification of Quantum Random Circuit Sampling

October 29, 2018
Author(s)
Adam Bouland, William J. Fefferman, Chinmay Nirkhe, Umesh Vazirani
A critical milestone on the path to useful quantum computers is the demonstration of a quantum computation that is prohibitively hard for classical computers -- a task referred to as quantum supremacy. A leading near-term candidate is sampling from the

The Lumberton, North Carolina Flood of 2016: A Community Resilience Focused Technical Investigation

October 29, 2018
Author(s)
John W. van de Lindt, Walter G. Peacock, Judith Mitrani-Reiser, Nathanael Rosenheim, Derya Deniz, Maria Dillard, Tori Tomiczek, Maria Koliou, Andrew Graettinger, Patrick Crawford, Kenneth W. Harrison, Andre Barbosa, Jennifer Tobin, Jennifer Helgeson, Lori Peek, Mehrdad Memari, Elaina Sutley, Sara Hamideh, Donghwan Gu, Stephen A. Cauffman, Juan Fung
In early October 2016 Hurricane Matthew crossed North Caroline as a category 1 storm with some areas receiving 15-18 inches of rainfall on already saturated soil. The NIST-funded Center for Risk-Based Community Resilience Planning teamed with researchers

On Correlating Mixed Forest Fuel Bed Fire Spread Data

October 28, 2018
Author(s)
Jiann Yang
Mixing rules are proposed and used to correlate mixed forest fuel bed fire spread data from the literature using the dimensionless correlations previously developed for single-species forest fuel bed fire spread with the help of dimensional analysis and

Standards-based integration of advanced process control and optimization

October 28, 2018
Author(s)
Guodong Shao, Hasan Latif, Carla Martin, Peter O. Denno
Integration of process control with optimization is critical to Smart Manufacturing (SM). Oftentimes, however, the process control solutions from one vendor do not interoperate with the optimization solutions of another. Incompatibilities among the

Best Practices for Quantification of Uncertainty and Sampling Quality in Molecular Simulations

October 27, 2018
Author(s)
Alan Grossfield, Paul Patrone, Daniel R. Roe, Andrew J. Schultz, Daniel Siderius, Daniel M. Zuckerman
The quantitative assessment of uncertainty and sampling quality is essential in molecular simulation. Many systems of interest are highly complex, often at the edge of current computational capabilities. Modelers must therefore analyze and communicate

Ethane/Ethylene Separation in a Metal-Organic Framework with Iron-Peroxo Sites

October 26, 2018
Author(s)
Libo Li, Rui-Biao Lin, Rajamani Krishna, Hao Li, Shengchang Xiang, Hui Wu, Jinping Li, Wei Zhou, Banglin Chen
The separation of ethane from its corresponding ethylene is a very important challenging and energy-intensive process in the chemical industry. Herein we report a microporous metal-organic framework Fe 2(O 2)(dobdc) (dobdc 4-: 2,5-dioxido-1,4

One Block at a Time Helping to Build Blockchain Knowledge

October 26, 2018
Author(s)
Dylan J. Yaga
This bulletin summarizes the information found in NISTIR 8202: Blockchain Technology overview which provides a high-level technical overview of blockchain technology. It discusses its application to cryptocurrency in depth, but also shows its broader
Displaying 11001 - 11025 of 73893
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