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Displaying 29476 - 29500 of 143806

Spontaneous growth of GaN nanowire nuclei on N- and Al-polar AlN: A piezoresponse force microscopy study of crystallographic polarity

March 2, 2016
Author(s)
Matthew D. Brubaker, Alexana Roshko, Paul T. Blanchard, Todd E. Harvey, Norman A. Sanford, Kristine A. Bertness
The polarity of gallium nitride (GaN) nanowire nuclei grown on AlN layers was studied by piezoresponse force microscopy (PFM). N- or Al-polar AlN layers were grown by molecular beam epitaxy (MBE) on Si (111) substrates by use of Al- or N-rich growth

3D Segmentation of Stem Cells from Thousands of Confocal Microscopy Images

March 1, 2016
Author(s)
Peter Bajcsy, Mylene H. Simon, Stephen J. Florczyk, Carl G. Simon Jr., Derek Juba, Mary C. Brady
We address the problem of estimating 3D segmentation performance when segmentation is applied to thousands of confocal microscopy images (z-stacks) of cells. With a very large number of z-stacks, manual inputs to validate each segmentation result are

A New Experiment for Determining Evaporation and Condensation Coefficients of Cryogenic Propellants

March 1, 2016
Author(s)
Kishan Bellur, E F. Medici, M Kulshreshtha, V Konduru, D Tyrewala, A Tamilarasan, J McQuillen, Juscelino Leao, Daniel S. Hussey, David L. Jacobson, Julia Scherschligt, J Hermanson, C Choi, J Allen
Passive and active technologies have been used to control propellant boil-o , but the current state of understanding of cryogenic evaporation and condensation in microgravity is insucient for designing large cryogenic depots critical to the long-term

A Review and Survey of Metrology Outreach Efforts in Post-Secondary Education

March 1, 2016
Author(s)
Georgia L. Harris, Maria Isabel Pena
The paper presents a brief history and background of metrology outreach efforts to colleges and universities. It also includes a summary of a 2015 international educational survey used in part to assess colleges and universities that have measurement

Comparison of C-14 liquid scintillation counting at NIST and NRC Canada

March 1, 2016
Author(s)
Denis E. Bergeron, Raphael Galea, Lizbeth Laureano-Perez, Brian E. Zimmerman
An informal bilateral comparison of 14C liquid scintillation (LS) counting at the National Research Council of Canada (NRC) and the National Institute of Standards and Technology (NIST) has been completed. Two solutions, one containing 14C-labeled sodium

Cross-spectrum Measurement of Thermal-noise Limited Oscillators

March 1, 2016
Author(s)
Archita Hati, Craig W. Nelson, David A. Howe
Cross-spectrum analysis is a commonly-used technique for the detection of phase and amplitude noise of a signal in the presence of interfering noise. It extracts the desired correlated noise from two time series which also contain uncorrelated interfering

Developments in the Ni-Nb-Zr Amorphous Alloy Membranes

March 1, 2016
Author(s)
S. Sarker, D. Chandra, M. Hirscher, M. Dolan, D. Isheim, J. Wermer, D. Viano, M. Baricco, Terrence J. Udovic, D. Grant, O. Palumbo, A. Paolone, R. Cantelli
Most of the global H 2 production is derived from hydrocarbon-based fuels, and efficient H 2/CO 2 separation is necessary to deliver a high purity H 2 product. Hydrogen-selective alloy membranes are emerging as a viable alternative to traditional pressure

Economics of Community Disaster Resilience Workshop Proceedings

March 1, 2016
Author(s)
Bilal Ayyub, Robert E. Chapman, Gearald Galloway, Richard Wright
This report documents the effort launched by the National Institute of Standards and Technology (NIST) to develop, organize, and convene a workshop on the economics of community disaster resilience to promote the use of economics for system sustainment and

Global DNA methylation loss associated with mercury contamination and aging in the American alligator (Alligator mississippiensis)

March 1, 2016
Author(s)
Frances Nilsen, John Bowden, Brittany L. Kassim, Colleen E. Bryan Sallee, Stephen E. Long, Benjamin B. Parrott, Stephen E. Somerville, Ted Lange, Patrick Delaney, Arnold Brunell, Louis J. Guillette
Mercury is a widespread environmental contaminant with exposures eliciting a well-documented catalog of negative outcomes in animals. Yet, our knowledge regarding the underlying mechanisms by which mercury exposures exert these effects remains incomplete
Displaying 29476 - 29500 of 143806
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