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Displaying 34526 - 34550 of 73832

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

Source-Assisted Direction Estimation Inside Buildings

April 11, 2006
Author(s)
Kamran Sayrafian, D Kaspar
Source direction estimation inside building is a difficult and challenging task due to severe multipath signal propagation. Numerous algorithms and techniques exist that provide high-resolution direction estimation under certain conditions and channel

Weights and Measures in the United States

April 11, 2006
Author(s)
Carol T. Hockert
What does the weights and measures system in the United States look like, and what impact does it have on commerce? Every state in the United States has its own weights and measures program, and many states have county and city run programs within their

CCEM.RF-S1.CL (GTRF/02-03): RF Power Measurements with 2.4 mm Connectors

April 10, 2006
Author(s)
Thomas P. Crowley, J Miall, J dereede, J. Furrer, A Michaud, E. Dressler, T Zhang, K. Shimaoka, Ji Hyun Kim
A supplementary comparison of RF power measurements using 2.4 mm connectors was performed at 9 national metrology laboratories. The traveling standards were two commercial thermoelectric sensors and an associated power meter. Measurements were made at

TRC Thermodynamic Tables - Hydrocarbons, Supplement H-131

April 10, 2006
Author(s)
Michael D. Frenkel
Table 23-2-(1.21420)-db - Pages db-1722.0 and db-1722.1 New table for 2,6,10,14-tetramethylpentadecane containing the density for the real fluid at selected temperatures and pressures. Table 23-2-(1.21440)-db - Pages db-1724.0 and db-1724.1 New table for 7

Texture Measurements in 001> Fiber-Oriented PMN-PT

April 9, 2006
Author(s)
Kristen H. Brosnan, G L. Messing, Richard J. Meyer, Mark D. Vaudin
Textured (1-x)(Mg1/3Nb2/3)O3-xPbTiO3 (PMN-PT) ceramics obtained by the templated grain growth (TGG) process a significant fraction of the piezoelectric properties of the Bridgman growth single crystals at a fraction of the cost. These materials could have

Method for Measuring the Raman Gain Tensor in Optical Fiber

April 7, 2006
Author(s)
Idan Mandelbaum, M Bolshtyansky, T F. Heinz, Angela R. Hight Walker
In this paper we introduce a technique to measure the tensor properties of the Raman gain in a short piece (10m) of silica based polarization maintaining optical fiber. We present the results of the measurement and show agreement with new and previous bulk

Performance of Electret Ionization Chambers in Magnetic Field

April 7, 2006
Author(s)
P Kotrappa, L R. Stieff, Timothy F. Mengers, Robert McMichael, Robert D. Shull
Electret Ionization Chambers (EIC) are widely used for measuring radon and radiation. The radiation measured includes alpha, beta and gamma radiation. These detectors do not have any electronics and as such can be introduced into magnetic field regions. It

Toward rapid and inexpensive identification of bulk carbon nanotubes

April 6, 2006
Author(s)
Katie Hurst, Anne Dillon, Jeffrey Blackburn, John H. Lehman
The volume fraction of metallic and semiconducting carbon single-wall nanotubes (SWNTs)hasbeen estimated for purified laser vaporization SWNTs, from an effective medium approximation and the measured spectral responsivity of a LiTaO 3 pyroelectric detector
Displaying 34526 - 34550 of 73832
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