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Search Publications

NIST Authors in Bold

Displaying 34376 - 34400 of 73697

Hot-wire chemical vapor synthesis for a variety of nano-materials with novel aplications

April 20, 2006
Author(s)
Anne Dillon, A. H. Mahan, Rohit Deshpande, J. L. Alleman, Jeffrey Blackburn, P. A. Parillia, M. J. Heben, Chaiwat Engtrakul, K.E.H. Gilbert, Kevin M. Jones, Bobby To, S Lee, John H. Lehman
Hot-wire chemical vapor deposition (HWCVD) has been demonstrated as a simple economically scalable technique for the synthesis of a variety of nano-materials in an environmentally friendly manner. For example we have employed HWCVD for the continuous

Structure and Magnetocaloric Properties of the Fe-Doped HoTiGe Alloy

April 20, 2006
Author(s)
Virgil Provenzano, B Baumgold, Robert D. Shull, Alexander J. Shapiro, Keiichi Koyama, Kazuo Watanabe, N K. Singh, K G. Suresh, A K. Nigam, S K. Malik
The structure and magnetocaloric properties of the Fe-doped HoTiGe compound were investigated by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), x-ray diffraction (XRD), superconducting quantum interference device (SQUID)

An Algorithm for Generating Very Large Covering Arrays

April 19, 2006
Author(s)
David R. Kuhn
This note describes a covering array algorithm that can be parallelized, making it possible to handle a much larger number of variables than other know algorithms. The algorithm trades test case optimization for speed ? it produces roughly 3% to 15% more

Chip scale atomic magnetometers

April 19, 2006
Author(s)
John M. Moreland, John Kitching, Peter D. Schwindt, Svenja A. Knappe, Li-Anne Liew, V Shah, V Gerginov, Ying-Ju Wang, Leo W. Hollberg
We are developing a new class of sensors based on atoms confined in micro-fabricated enclosures. Recent work at the National Institute of Standards and Technology (NIST) has lead to a prototype chip scale atomic clock (CSAC) with remarkable operating

Interface Characterization of Molecular-Monolayer/SiO2 Based Molecular Junctions

April 19, 2006
Author(s)
Curt A. Richter, Christina Hacker, Lee J. Richter, Oleg A. Kirillov, John S. Suehle, Eric M. Vogel
We present a correlation of the results of dc-current-voltage (IV) and ac-capacitance-voltage (CV) measurements with vibrational spectroscopy of Au/monolayer/SiO2/Si structures to establish an improved understanding of the interactions at the buried metal/

Magnetic Fluids' Phase Transition Between Micelle and Mono-Dispersed Phases

April 18, 2006
Author(s)
S Taketomi, R V. Drew, Robert D. Shull
A very stably dispersed magnetic fluid (Mother MF) and its 1000-times diluted solution were independently zero-field-cooled from room temperature to 5 K followed by application of a magnetic field of 2.86 MA/m for 300 seconds. After the field was removed

Controlling Polar Molecules in Optical Lattices

April 17, 2006
Author(s)
Svetlana A. Kotochigova, Eite Tiesinga
We determine conditions for effective quantum control over internal and external degrees of freedom of polar alkali-metal molecules in optical lattices. We show that a relatively modest laser intensity is needed for strong confinement of polar molecules in

Electronic Effects in Length Distribution of Atom Chains

April 17, 2006
Author(s)
Jason Crain, Mark D. Stiles, Joseph A. Stroscio, Daniel T. Pierce
Gold deposited on Si(553) leads to self assembly of atomic chains, which are broken into finite segments by atomic defects. Scanning tunneling microscopy is used to investigate the distribution of chain lengths and the correlation between defects

Erbium-doped Gold Sensor Films for Magnetic Microcalorimeter X-ray Detectors*

April 17, 2006
Author(s)
Barry L. Zink, Kent D. Irwin, Gene C. Hilton, Joel Ullom, David P. Pappas
We briefly review the principles of a magnetic microcalorimeter x-ray detector and the requirements for fabricating an array of these sensors, which include a paramagnetic sensor fabricated with thin-film techniques. We discuss two methods for depositing

Size-related plasticity effects in AFM silicon cantilever tips

April 17, 2006
Author(s)
Malgorzata Kopycinska-Mueller, Roy H. Geiss, Donna C. Hurley
We are developing dynamic atomic force microscopy (AFM) techniques to determine nanoscale elastic properties. Atomic force acoustic microscopy (AFAM) makes use of the resonant frequencies of an AFM cantilever while its tip contacts the sample surface at a

Suppression of Orange-Peel Coupling in Magnetic Tunnel Junctions by Preoxidation

April 17, 2006
Author(s)
William F. Egelhoff Jr., Robert McMichael, Cindi L. Dennis, Mark D. Stiles, Alexander J. Shapiro, Brian B. Maranville, Cedric J. Powell
We have found that preoxidation of the bottom Co electrode in magnetic tunnel junctions (MTJs) very effectively suppresses orange-peel coupling. The result is a free layer that is much softer. Work by others has demonstrated that preoxidation is compatible

Water Heat Pipe Blackbody as a Reference Spectral Radiance Source Between 50 C and 250 C

April 17, 2006
Author(s)
Mart Noorma, Sergey Mekhontsev, V B. Khromchenko, Maritoni A. Litorja, Claus Cagran, Jinan Zeng, Leonard M. Hanssen
Realization of a radiometric temperature scale for near ambient temperatures with high accuracy is crucial for a number of demanding military and commercial applications. Reliable radiation sources with high stability and good spatial uniformity have to be

Normal Metal-insulator-superconductor Junction Technology for Bolometers

April 15, 2006
Author(s)
Dan Schmidt, William Duncan, Kent D. Irwin, Konrad Lehnert, Nathan A. Tomlin, Joel Ullom
Normal metal-insulator-superconductor tunnel junctions are candidates for large-format arrays of ultra-low noise equivalent power bolometers. Using a wafer scale process we have fabricated devices with required the sub $\mu}$m$^3}$ volumes and ohmic

Optimization of Transition-Edge Calorimeter Performance

April 15, 2006
Author(s)
Joel N. Ullom, James A. Beall, William B. Doriese, William Duncan, S. L. Ferreira, Gene C. Hilton, Kent D. Irwin, Galen C. O'Neil, Carl D. Reintsema, Leila R. Vale, Barry L. Zink
Calorimeters that exploit the superconducting-to-normal transition are used to detect individual photons from near-infrared to γ-ray wavelengths. Across this wide range, absorption efficiency, speed, and energy resolution are key performance parameters

Laser Cooling Without Repumping: A Magneto-Optical Trap for Erbium Atoms

April 14, 2006
Author(s)
Jabez J. McClelland, James L. Hanssen
We report on a novel mechanism that allows for laser cooling of atoms that do not have a closed cycling transition. This mechanism is observed in a magneto-optical trap for erbium, an atom with a very complex energy level structure with multiple pathways

Carbon Dioxide, Global Warming, and Michael Crichtons State of Fear

April 13, 2006
Author(s)
Bert W. Rust
In his recent novel, State of Fear (HarperCollins, 2004), Michael Crichton questioned the connection between global warming and increasing atmospheric carbon dioxide by pointing out that for 1940-1970, temperatures were decreasing while atmospheric carbon

Capillarity Induced Solvent?Actuated Bonding of Polymeric Microfluidic Devices

April 12, 2006
Author(s)
Jayna J. Shah, Jon C. Geist, Laurie E. Locascio, Michael Gaitan, Rao Mulpuri, Wyatt N. Vreeland
Rapid, robust and economical fabrication of fluidic microchannels is of fundamental importance for the successful development of disposable lab-on-a-chip devices. In this work, we present a solvent-actuated bonding method for fabricating polymeric

Combinatorial Method for Determining Optimum Tissue Scaffold Composition for Imaging by X-Ray Techniques

April 12, 2006
Author(s)
Carl G. Simon Jr., Yanyin Yang, Shauna M. Dorsey, Gary E. Schumacher, Glenn M. Flaim, J Kohn, Sheng Lin-Gibson, Matthew Becker
X-ray imaging techniques can be very useful for tissue engineering applications. The ability to image radiopaque medical implants in vivo with X-ray radiography enables clinicians to conveniently, inexpensively and non-invasively monitor wound healing and

Confirmation of Interstellar Methycyanodiacetylene (CH3C5N)

April 11, 2006
Author(s)
Lewis E. Snyder, J M. Hollis, P R. Jewell, Francis J. Lovas, A J. Remijan
Ten spectral lines of the symmetric-top molecule methylcyanodiacetylene (CH3C5N) have been detected with the 100 m Green Bank Telescope (GBT) toward the Taurus molecular cloud TMC-1. Both K=0 and K=1 components of the 12K-11K, 13K-12K, 14K-13K, 15K-14K

Short Fundamental Equations of State for 20 Industrial Fluids

April 11, 2006
Author(s)
Eric W. Lemmon, Roland Span
In a preceding project, functional forms for "short" Helmholtz equations of state for typical non- and weakly polar fluids and for typical polar fluids were developed by simultaneous optimization. The coefficients of these equations of state were fitted to

Simultaneous Grain Boundary Migration and Grain Rotation

April 11, 2006
Author(s)
M Upmanyu, David J. Srolovitz, A E. Lobkovsky, James A. Warren, W Carter
The energy of a polycrystalline network can be reduced by both grain boundary migration and by grain rotation. We perform a series of molecular dynamics (MD) simulations of a circular grain embedded in an otherwise single crystal matrix and monitor both
Displaying 34376 - 34400 of 73697
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