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Search Publications

NIST Authors in Bold

Displaying 38651 - 38675 of 73697

Checks of Amplifier Noise-Parameter Measurements

June 11, 2004
Author(s)
James P. Randa, Dave K. Walker
We propose two verification methods for measurements of noise parameters of amplifiers, particularly low-noise amplifiers (LNAs). One method is a direct measurement of the parameter Trev, the noise temperature from the amplifier input, and the comparison

Extended NVNA Bandwidth for Long-Term Memory Measurements

June 11, 2004
Author(s)
Catherine A. Remley, Dominique Schreurs, Dylan F. Williams, John Wood
We present a new technique for measuring the magnitude and phase of intermodulation products outside the measurement bandwidth of our instrumentation. We apply the technique to measurements of long-term memory effects, and realte our measurements to

Non-Linear Large-Signal Scattering Parameters: Theory and Applications

June 11, 2004
Author(s)
Jeffrey Jargon, Kuldip Gupta, Donald C. DeGroot
We introduce nonlinear large-signal scattering parameters, a new type of frequency-domain mapping that relates incident and reflected signals for sparse-tone inputs. We present a general form of nonlinear large-signal scattering parameters and show that

Available Data and Input Into Models.

June 10, 2004
Author(s)
R F. Fahy
There is a need for better data to improve our knowledge of human behavior in fire. This data can be used in the development and refinement of evacuation models and in the use of such models. Once collected, human behavior data must be published in peer

Controlled Vesicle Self-Assembly in Continuous Two Phase Flow Microfluidic Channels

June 10, 2004
Author(s)
Andreas Jahn, Wyatt N. Vreeland, Laurie E. Locascio, Michael Gaitan
The spontaneous self-assembly of phospholipids into liposomes in aqueous solution results in the encapsulation of reagents into quantized packets in a manner that mimics cellular life-processes. Since their discovery in 1965, liposomes have been used in a

Development and Application Issues of a Spectrally Tunable LED Source

June 8, 2004
Author(s)
George P. Eppeldauer, Steven W. Brown, G Dezsi, Irena Fryc, Yoshihiro Ohno
A spectrally tunable solid state source based on Light Emitting Diodes (LEDs) is being developed at the National Institute of Standards and Technology (NIST). The tunable source will emulate the spectral distributions of various light sources and can be

Radiometer Measurements of a Near-Ambient, Variable-Temperature Noise Standard

June 7, 2004
Author(s)
George Free, James P. Randa, Robert L. Billinger
A near-ambient, variable-temperature noise standard whose physical temperature can be accurately measured was constructed and then measured with the NIST total-power radiometer to test the accuracy of radiometer measurements in the temperature range of 263

2003 AAAI Robot Competition and Exhibition

June 1, 2004
Author(s)
S E. Maxwell, Adam S. Jacoff, J Casper, Brian Weiss, Jean C. Scholtz, H A. Yanco, M Micire, D W. Stroup
The fourth annual Rescue Robot Competition took place at the IJCAI/AAAI 2003 Conference in Acapulco, Mexico. The competition encourages participants to contribute to the field of urban search and rescue (USAR) robotics and provides the competitors with a

A study of magnetic interactions of Ni80Fe20 arrays using ultra-sensitive microcantilever torque magnetometry

June 1, 2004
Author(s)
Lan Gao, D. Q. Feng, L. Yuan, T. Yokota, R. Sabirianov, Sy-Hwang Liou, Michelle Chabot, Daniel Porpora, John M. Moreland
We have successfully fabricated single and paired 300 nm × 1.5 υm × 32 nm Ni 80Fe 20 bars on a microcantilever using focused ion beam milling. Magnetic interactions of these paired bars were studied by using magnetic force microscopy, microcantilever

Active Vibration Isolation for a Long-Range Scanning Tunneling Microscope

June 1, 2004
Author(s)
K J. Lan, J Y. Yen, John A. Kramar
Vibration Isolation or control is critical for the optimum operation of the Molecular Measuring Machine (M3), a high-resolution, length-metrology instrument at the National Institute of Standards and Technology. This paper describes the extension of the M3

Analysis of Some Combination-Overtone Infrared Bands of 32 S 16 O 3

June 1, 2004
Author(s)
A G. Maki, Thomas A. Blake, R L. Sams, J Frieh, J Barber, Tony Masiello, E T. Chrysostom, J Nibler, A Weber
Several new infrared absorption bands for 32S16O3 have been measured and analyzed. The principal bands observed were v1 + v2 (at 1561 cm-1), v1 + v4 (at 1594 cm-1, v3 + v4 at 1918 cm-1), and 3v3 (at 4136 cm-1). Except for 3v3, these bands are very

Artifacts in Ballistic Magnetoresistance Measurements

June 1, 2004
Author(s)
William F. Egelhoff Jr., L Gan, H Ettedgui, Y Kadmon, Cedric J. Powell, P J. Chen, Alexander J. Shapiro, Robert McMichael, J Mallett, Thomas P. Moffat, Mark D. Stiles, Erik B. Svedberg
We have studied the behavior of electrodeposited Ni and Fe nanocontacts in magnetic fields and the changes in resistivity (Δ}R) that occur. Metallic particles suspended in plating solution, created and collected from the electroplating bath of a

Artifacts in Ballistic Magnetoresistance Measurements

June 1, 2004
Author(s)
William F. Egelhoff Jr., L Gan, H Ettendgui, Y Kadmon, Cedric J. Powell, P J. Chen, Alexander J. Shapiro, Robert McMichael, J Mallett, Thomas P. Moffat, Mark D. Stiles
We have carried out an extensive search for credible evidence to support the existence of a ballistic magnetoresistance (BMR) effect in magnetic nanocontacts. We have investigated both thin-film and thin-wire geometries for both mechanically-formed and

Atomic Spectral Tables for the Chandra X-Ray Observatory. Part II (Si vi - Si xii)

June 1, 2004
Author(s)
Larissa Podobedova, Daniel E. Kelleher, Joseph Reader, Wolfgang L. Wiese
Tables of critically compiled wavelengths, energy levels, line classifications, and transition probabilities are given for spectra of ionized silicon (Si VI - Si XII) in the region 25 to 170 . These tables provide data of interest for the Emission Line
Displaying 38651 - 38675 of 73697
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