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NIST Authors in Bold

Displaying 4626 - 4650 of 13217

Micro/nano-wear studies on epoxy/silica nanocomposites

April 18, 2013
Author(s)
Zhengzhi Wang, Ping Gu, Xiao-ping Wu, Zhong Zhang, Martin Chiang, Hui Zhang
… micro/nano-scale wear volume (i.e., volume of wear loss) in a test to characterize the wear-resistance of … of sample surface, before/after the test, obtained using in-situ scanning probe microscopy (SPM) were used to … content, and the increase corresponds to an improvement in wear resistance of nanocomposites. This transition …

Characterization of high-temperature superconducting conductor on round core cables in magnetic fields up to 20 T

February 13, 2013
Author(s)
Daniel C. van der Laan, Patrick D. Noyes, Miller E. George, Hubertus W. Weijers, Willering P. Gerard
… (HTS). Conductor on round core (CORC) cables, in which RE-Ba 2 Cu 3 O 7-δ (RE = rare earth) (REBCO) coated conductors are wound in a helical fashion on a flexible core, are a practical and … We performed the first tests of CORC magnet cables in liquid helium in magnetic fields of up to 20 T. A record …

Correlating Chlorine-Induced Changes in Mechanical Properties to Performance in Polyamide-Based Thin Film Composite Membranes

January 26, 2013
Author(s)
Junghyun Lee, Jun Y. Chung, Edwin Chan, Christopher Stafford
… desalination and water purification modules. In this study, chlorine-induced structural changes of fully-aromatic and semi-aromatic PA active layers used in reverse osmosis (RO) and nanofiltration (NF) membranes … the overall membrane performance. A significant increase in water flux and a large decrease in salt rejection were …

Impact of Size on Carbon Nanotube Transport in Natural Porous Media

September 17, 2012
Author(s)
Denis O'Carroll, Xeuying Liu, Nikolai Mattison, Elijah Petersen
… chemical resistance. This has led to their application in a wide variety of industries, (e.g., in composite materials). As a result of their potential … to humans and ecosystems, there is increasing interest in understanding the factors that control the transport of …

Error Modeling of Seebeck Coefficient Measurements Using Finite Element Analysis

August 28, 2012
Author(s)
Joshua B. Martin
… we have developed a metrology simulation to model errors in the measurement of the Seebeck coefficient. This physical … potential that is generated across a conductor when placed in an applied thermal gradient. Its measurement requires … Measurement Science and Technology …

Framework for hybrid life-cycle inventory databases: BEES case study

June 1, 2012
Author(s)
Sangwon Suh, Barbara C. Lippiatt
… In an effort to develop a whole building LCA tool, NIST is … new bottom-up BEES data into a hybrid database in which the strengths of both bottom-up and top-down … structure. The step-by-step procedure illustrated in this paper will enable the creation of a hybridized BEES …

Mercury Stable Isotopes in Seabird Eggs Reflect a Gradient from Terrestrial Geogenic to Oceanic Mercury Reservoirs

April 21, 2012
Author(s)
Russell D. Day, David G. Roseneau, Sylvain Berail, Keith A. Hobson, O.F.X Donard, Stacy S. Schuur, Rebecca S. Pugh, Amanda J. Moors, Stephen E. Long, Paul R. Becker
… Elevated mercury concentrations ([Hg]) were found in Alaskan seabird eggs (Uria spp.) from the coastal … embayment of Norton Sound relative to insular colonies in the northern Bering Sea. Stable isotopes of Hg, carbon (C), and nitrogen (N) were measured in these eggs to investigate the source of this enrichment. …

Development of Ballistics Identification - From Image Comparison to Topography Measurement in Surface Metrology-

March 22, 2012
Author(s)
Jun-Feng Song, Theodore V. Vorburger, Robert M. Thompson, Thomas Brian Renegar, Xiaoyu Alan Zheng, James H. Yen, Richard M. Silver, Wei Chu
… these bullets and cartridge cases to the firearm used in a crime scene. Current automated ballistics identification … Measurement Science & Technology … - From Image Comparison to Topography Measurement in Surface Metrology- …

Pilot Estuarine Mesocosm Study on the Environmental Fate of Silver Nanomaterials Leached from Consumer Products

January 10, 2012
Author(s)
Danielle Cleveland, Stephen E. Long, Paul L. Pennington, Emily Cooper, Michael H. Fulton, Geoffrey I. Scott, Elijah J. Petersen, Timothy M. Brewer, Jeffrey M. Davis, Laura J. Wood
… of consumer products are such that they will end up in landfills or elsewhere in the environment. In this work, the leaching of silver from three silver … Environmental Science & Technology …

Performing three dimensional measurements on micro-scale features using a flexible CMM fiber probe with ellipsoidal tip

January 5, 2012
Author(s)
Balasubramanian Muralikrishnan, Jack A. Stone Jr., Craig M. Shakarji, John R. Stoup
… to the surface) facilitates probe radius compensation in a straightforward manner. Neither of these conditions is … data from test artifacts. We describe these issues here in the context of an application involving three-dimensional … Measurement Science & Technology …

A Streamlined Hydrolysis Procedure for the LC/MS/MS Analysis of Cocaine in Wastewater Samples

January 2, 2012
Author(s)
Katrice A. Lippa, Kevin Bisceglia, A. Lynn Roberts
… streamlined procedure for the routine analysis of cocaine in municipal wastewater. By adding NaOH (to 0.025 M) and … (RP) or hydrophilic interaction (HILIC) chromatography. In addition to cocaine, three opioids (morphine, hydrocodone, … streamlined approach for the analysis of drugs of abuse in untreated municipal wastewater are in excellent agreement …

Copper oxide nanoparticle mediated DNA damage in terrestrial plant models

December 22, 2011
Author(s)
Bryant C. Nelson, Donald H. Atha, Elijah J. Petersen, Huanhua Wang, Danielle Cleveland, Richard D. Holbrook, Pawel Jaruga, M Miral Dizdar, Baoshan Xing
… mechanical and catalytic properties, are presently found in many commercial products and will be intentionally or … have been shown to act as mediators of DNA damage in mammalian cells, organisms and even in bacteria, but the molecular mechanisms through which this …

Nanometrology Using Through-Focus Scanning Optical Microscopy Method

December 21, 2011
Author(s)
Ravikiran Attota, Richard M. Silver
… using a conventional bright-field optical microscope. In the TSOM method a target is scanned through the focus of … a given experimental condition and is sensitive to changes in the dimensions of a target in a distinct way. We use this characteristic for nanoscale …

Reversible effect of strain on transport critical current in Bi 2 Sr 2 CaCu 2 O 8+x superconducting wires: A modified descriptive strain model

December 5, 2011
Author(s)
Najib Cheggour, Xifeng Lu, T G. Holesinger, Theodore C. Stauffer, J Jiang, Loren F. Goodrich
… strain effect on transport critical current I c was found in Bi 2 Sr 2 CaCu 2 O 8+x (Bi-2212) high-temperature … and 16 T up to an irreversible strain limit of about 0.3 % in longitudinal tension, prompting hope that the Bi-2212 … has the potential to sustain mechanical strains generated in high-field magnets. However, I c was not reversible under …

High-current dc power transmission in flexible RE-Ba 2 Cu 3O 7-d coated conductor cables

December 1, 2011
Author(s)
Daniel C. van der Laan, Loren F. Goodrich, Timothy J. Haugan
… grid. These cables carry an ac current of up to 3,000 A in a much smaller size than conventional transmission lines, … A and would benefit from superconducting transmission in lightweight, flexible cables that would be cooled with … of two electrically insulated phases that can be operated in different modes, which allows us to study the effect of …

Anisotropic in-plane reversible strain effect in Y 0.5 Gd 0.5 Ba 2 Cu 3 O 7-d coated conductors

October 19, 2011
Author(s)
Daniel C. van der Laan, Dmytro Abraimov, A A. Polyanskii, David C. Larbalestier, J. F. Douglas, R. Semerad, M Bauer
… on the critical current density and flux pinning strength in the high-temperature superconductor Bi 2 Sr 2 Ca 2 Cu 3 O … for RE-Ba 2 Cu 3 O 7-δ (RE = rare earth) superconductors, in part because the in-plane pressure dependence of its critical temperature is … Superconductor Science and Technology …

Potential release pathways, environmental fate, and ecological risks of carbon nanotubes

October 11, 2011
Author(s)
Elijah J. Petersen, Andrew Whelton, Liwen Zhang, Qingguo Huang, Nasir M. Uddin, Nikolai Mattison, Denis O'Carroll, Theodore Henry, Tinh Nguyen, Richard D. Holbrook, Kai Chen
… Carbon nanotubes are currently being used in a number of consumer products, and exponentially higher … masses and a broader range of applications are expected in future years. However, the data on the environmental … is assessed. The most pressing measurement needs in each of these areas are also highlighted. …
Displaying 4626 - 4650 of 13217
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