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Search Publications

NIST Authors in Bold

Displaying 10176 - 10200 of 13225

Thermochemical principles of the production of lightweight aggregates from waste coal bottom ash

August 12, 2020
Author(s)
Edward Garboczi, Mohammad Balapour, Rathin Rao, Sabrina Spatari, Grace Hsuan, Peter Billen
… Manufacturing lightweight aggregate (LWA) (i.e., porous … to form pores. This study evaluates these three conditions in the production of LWAs made from two types of waste coal … extent of the liquid phase and calculate its viscosity. In conjunction with thermochemical analysis, an experimental …

Studies to Predict Maintenance Time Duration and Important Factors From Maintenance Workorder Data

September 26, 2019
Author(s)
Fnu Madhusudanan Navinchandran, Michael E. Sharp, Michael P. Brundage, Thurston B. Sexton
… information regarding maintenance activities in a factory or other industrial setting. Analysis of these … insights, it is first necessary to transform the data in the MWOs (generally some form of natural language) into … methods, it is possible to explain the factors captured in the MWOs that have the strongest relationship with the …

LTE Handset Emissions: Radiation Pattern Measurements Final Test Report

August 16, 2019
Author(s)
Robert D. Horansky, Jason B. Coder, John M. Ladbury
… uplink (UL) emissions generated by User Equipment(UE) in the 1755 MHz to 1780 MHz band with the intent to develop … of Defense (DoD)systems that, for a time, will remain in the 1755 MHz to 1780 MHz band.The test executed by NASCTN … the emissions of commercial LTE UEs, both individually and in aggregate. This projectperformed a series of controlled …

X-ray computed tomography instrument performance evaluation, Part I: Sensitivity to detector geometry errors

July 11, 2019
Author(s)
Balasubramanian Muralikrishnan, Katharine M. Shilling, Steven D. Phillips, Wei Ren, Vincent Lee, Felix H. Kim
… X-ray computed tomography (XCT), long used in medical imaging and defect inspection, is now increasingly … used for dimensional measurements of geometrical features in engineering components. With widespread use of XCT … errors, and their effect on dimensional measurements. In particular, we have studied detector and rotation stage …

Ultrafast, deep-dopant diffusion in crystalline silicon by laser-induced full area surface melting

November 1, 2018
Author(s)
Zibo Zhou, Ivan Perez-Wurfl, Brian Simonds
… As solar cell back contact schemes have improved in recent years, the non-ideal emitter region has become a dominant contributor to overall losses in solar cell efficiency. Our analysis shows that these … cell device is created and its performance is discussed. In order to understand the causes limiting cell performance, …

Improving Measurement for Smokestack Emissions - Workshop Summary

September 21, 2018
Author(s)
Rodney A. Bryant, Aaron N. Johnson, John D. Wright, Tamae M. Wong, James R. Whetstone, Michael R. Moldover, Iosif I. Shinder, Scott Swiggard, Chris Gunning, David Elam, Tom Martz, Eric Harman, David Nuckols, Liang Zhang, Woong Kang, Salvator Vigil
… The complex flow conditions inherent in power plant smokestacks make accurate flow measurements challenging, which in turn limits the accuracy of hazardous emissions … a year via the flow relative accuracy test audit (RATA). In most cases the flow RATA is performed using an S-type …

Urinary Phthalate Metabolites in Common Bottlenose Dolphins (Tursiops truncatus) from Sarasota Bay, FL, USA

September 5, 2018
Author(s)
Leslie Hart, Barbara Beckingham, Randall Wells, Moria Alten-Flagg, Kerry Wischusen, Amanda Moors, John Kucklick, Pisarski Emily, Ed Wirth
… impairment, among other adverse health effects, in laboratory animals and human epidemiologic studies. Common … to environmental pollutants due to their apex position in the food chain, long life spans, and habitat overlap with … to two of the most commonly used phthalates in commercial manufacturing, diethyl phthalate (DEP) and di-2-ethylhexyl …

Investigation of a Simulated Chinese Jade Dagger by Neutron Radiography and Prompt Gamma Activation Analysis

July 17, 2018
Author(s)
Jacob LaManna, Richard Livingston, Ariel O'Connor, Huaiyu H. Chen-Mayer, Danyal J. Turkoglu
… In ancient China during the Shang dynasty, ca. 1600-1046 BCE, … of a nephrite jade [Ca2(Mg, Fe)5Si8O22(OH)2] blade mounted in a bronze haft. Several examples of these daggers are held … jade tang hidden within the bronze haft and uncover early manufacturing techniques. As a preliminary test of …

Lessons Learned from Spray Polyurethane Foam Emission Testing using Micro-chambers

October 16, 2016
Author(s)
Dustin Poppendieck, Mengyan Gong, Lauren E. Lawson
… micro-chamber testing conditions. Although limitations in the current proposed method do not allow the generated data to be directly used in exposure modeling, it does allow conclusions to be drawn … emission profiles (constant versus exponential decay) in the same foam, 5) emission rates from SPF are highly …

Emerging Metrology for High Throughput Nanomaterial Genotoxicology

August 26, 2016
Author(s)
Bryant C. Nelson, Christa W. Wright, Yuko Ibuki, Maria Moreno-Villanueva, Hanna L. Karlsson, Giel Hendriks, Christopher M. Sims, Neenu Singh, Shareen H. Doak
… The rapid development of the engineered nanomaterial (ENM) manufacturing industry has accelerated the incorporation of … come into contact with humans or other organisms resulting in unexpected biological effects. It is thus prudent to have rapid and robust analytical metrology in place that can be used to critically assess and/or predict …

Photochemical transformations of thiolated polyethylene glycol coatings on gold nanoparticles

August 16, 2016
Author(s)
Stacey M. Louie, Justin M. Gorham, Eric A. McGivney, Jingyu Liu, Kelvin B. Gregory, Vincent A. Hackley
… Photochemical reactions can result in significant transformations of manufactured nanomaterials in sunlit environments. While transformations of inorganic … reactivity that control NP transport, fate, and toxicity in natural and biological environments. Here, we assess the …

Structural Changes and Aggregation Mechanisms for Anti-Streptavidin IgG1 at Elevated Concentration

December 10, 2015
Author(s)
Gregory V. Barnett, Wei Qi, Samiul Amin, E. Neil Lewis, Vladimir I. Razinkov, Bruce A. Kerwin, Yun Liu, Christopher J. Roberts
… Non-native protein aggregation may occur during manufacturing and storage of protein therapeutics, and this … patient safety. From a regulatory perspective, changes in higher-order structure due to aggregation are of … concentrations (e.g. 1 mg/mL) indicated would result in different aggregation mechanisms. Time-dependent …

Measuring collected gas with microwave and acoustic resonances

April 23, 2015
Author(s)
Keith A. Gillis, James W. Schmidt, Michael R. Moldover, James B. Mehl
… With calibrations of large flow meters in mind, we established the feasibility of determining the … problem of accurately measuring the average speed-of-sound in the gas. We heated the tank's top until it was 13 K warmer … frequencies can be used to "weigh" the compressed gas in much larger tanks, which might be made from ferromagnetic …

D90: The strongest contributor to setting time in MTA and Portland Cement

April 15, 2015
Author(s)
William Ha, Dale P. Bentz, Wyatt Kahler, Laurence Walsh
… that much of this variation was due to differences in particle size distribution. Methods: Two gram samples from … or ISO 9917.1 (n=1), or not divulged to the authors (n=1). In a parallel experiment, six samples of different … reactions occurring during the setting of these pastes. In all experiments, linear correlations were assessed between …

Functionalization-Dependent Induction of Cellular Survival Pathways by CdSe Quantum Dots in Primary Normal Human Bronchial Epithelial Cells

September 5, 2013
Author(s)
Amber Nagy, Jennifer A. Hollingsworth, Bin Hu, Andrea Steinbruck, Peter C. Stark, Cristina Rios Valdez, Momchilo Vuyisich, Michael H. Stewart, Donald H. Atha, Bryant C. Nelson, Rashi Iyer
… and drug delivery. They are increasingly manufactured in large quantities which can lead to incidences of both … the cytotoxic and genotoxic effects of CdSe QDs in primary normal human bronchial epithelial cells (NHBEs). … QDs with negative or positive charges, respectively. In the current study, CYST-QDs were found to have …

Etching process effects on surface structure, fracture strength, and reliability of single-crystal silicon theta-like specimens

May 30, 2013
Author(s)
Michael S. Gaither, Richard S. Gates, Rebecca R. Kirkpatrick, Robert F. Cook, Frank W. DelRio
… and, consequently, device lifetime and reliability. In order to optimize MEMS device reliability, it is therefore … theta, acts as a tensile test specimen when loaded in compression by generating a uniform tensile stress in the … into the role of etching-induced surface features on the manufacturing yield and operational reliability of MEMS …

Towards Timely Intelligence in the Power Grid

February 25, 2013
Author(s)
YaShian Li-Baboud, Julien M. Amelot, Dhananjay Anand, Gerard N. Stenbakken, Thomas L. Nelson, James Moyne
… the key lessons learned from the 2003 Northeast Blackout in the United States was the need for improved timing. The … assess, and monitor the performance of network timing in various test scenarios. Furthermore, in conjunction with the NIST Synchrophasor Lab, a prototype …

Patterned Defect & CD Metrology by TSOM Beyond the 22 nm Node

April 10, 2012
Author(s)
Ravikiran Attota, Abraham Arceo, Benjamin Bunday, Victor Vertanian
… changes at the nanoscale, such as small perturbations in sidewall angle and height, with little or no ambiguity, … (CD), photomask, overlay and defect metrologies [8]. In-line defect metrology is continuously challenged by the … bright-field techniques currently used in semiconductor manufacturing will not be able to meet …

Assessment of Factors Affecting Fire Performance of Mattresses: A Review

March 20, 2012
Author(s)
Shonali Nazare, Rick D. Davis
… An in-depth analysis of U.S. residential fire statistics shows … regulation (16 CFR 1633) was recently introduced in the U.S. The 16 CFR 1633 prescribes performance standards … for residential mattress has generated much interest in understanding the burning behavior of mattresses as well …

Measured CO Concentrations at NIST IAQ Test House from Operation of Portable Electric Generators in Attached Garage Interim Report

July 8, 2011
Author(s)
Steven J. Emmerich, Liangzhu Wang
… from portable gasoline powered generators that can result in death or serious and/or lasting adverse health effects in exposed individuals. Such exposures have increased in recent years. Based on CPSC data, the total yearly … Test House from Operation of Portable Electric Generators in Attached Garage Interim Report …
Displaying 10176 - 10200 of 13225
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