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Displaying 801 - 825 of 1560

Remote, Near-Field Measurement of Large Antennas

August 17, 2002
Author(s)
Ronald C. Wittmann, Michael H. Francis
It is difficult to characterize many antenna systems in a laboratory environment. Size is the major consideration, but an increasing number of sophisticated antennas are being placed at remote sites where they are simply inaccessible. Of particular concern

Concealed Weapons Detection using an Uncooled Millimeter-wave Microbolometer System

August 1, 2002
Author(s)
Erich N. Grossman, V. A. Bhupathiraju, Aaron J. Miller, Carl D. Reintsema
We describe the status of, and present the first imagery obtained using, an active uncooled mm-wave microbolometer-based imaging system. The microbolometers consist of 2 mm x 6 mm x .02 mm Nb films, coupled to the incident field by annular slot antennas

Metal Detector Studies: Research Materials

August 1, 2002
Author(s)
James R. Baker-Jarvis, Raian K. Kaiser, Michael D. Janezic, Nicholas Paulter, Ken L. Stricklett
The purpose of the work described in this report is to develop and characterize materials that mimic the electromagnetic characteristics of the human body. The materials will be used to simulate the relevant electromagnetic properties of the human body

Controlled Barrier Modification in Nb/NbOx/Ag Metal Insulator Metal Tunnel Diodes

June 15, 2002
Author(s)
Erich N. Grossman, Todd E. Harvey, Carl D. Reintsema
The nonlinear electrical transport properties of metal-insulator-metal (MIM) tunnel diodes based on a barrier of naturally grown niobium oxide have been measured at room temperature and analyzed. In most cases excellent agreement is found between the

Simulations of Noise-Parameter Uncertainties

June 7, 2002
Author(s)
James P. Randa
This paper reports results for uncertainties obtained using a Monte Carlo simulation of noise-parameter measurements. The simulator permits the computation of the dependence of the uncertainty in the noise parameters on uncertainties in the underlying

Vector Corrected Noise Temperature Measurements

June 7, 2002
Author(s)
Mark H. Weatherspoon, Lawrence P. Dunleavy, Ali Boudiaf, James P. Randa
A new one-port noise temperature measurement technique is presented that uses receiver noise parameters for error correction. Improved accuracy in one-port noise temperature measurements made with commercial systems is demonstrated without using isolators

Bounds on Permittivity Calculations using a TE 01d Dielectric Resonator

May 20, 2002
Author(s)
Jerzy Krupka, Kristof Derzakowski, Billy F. Riddle, James R. Baker-Jarvis, Robert N. Clarke, A. Abramowicz, O. C. Rochard
The use of both mode-matching and Rayleigh-Ritz numerical techniques for complex permittivity calculations using a TE 01δ mode dielectric resonator allows the determination of lower and upper bounds of the permittivity. The maximum difference of the

Spin polarization of injected electrons

May 17, 2002
Author(s)
W F. Egelhoff, M D. Stiles, David P. Pappas, D T. Pierce, J M. Byers, M B. Johnson, B T. Jonker, Jose E. Alvarellos, J G. Gregg, J A. Bland, R Buhrman

Magnetostriction and angular dependence of FMR linewidth in Tb-doped Ni 0.8 Fe 0.2 thin films

May 15, 2002
Author(s)
Stephen E. Russek, Pavel Kabos, Robert McMichael, C G. Lee, William E. Bailey, R Ewasko, S. Sanders
We present the dependence of the magnetostriction in Ni 0.8Fe 0.2 films on Tb and Gd doping concentration with the measured doping dependence of the high-frequency damping. While the magnetostriction and the high-frequency damping are correlated, the

Multifilmamentary Nb 3 Sn wires reacted in hydrogen gas

May 1, 2002
Author(s)
M Takayasu, R G. Ballinger, Ronald B. Goldfarb, A. A. Squitieri, P. J. Lee, David C. Larbalestier
Reaction of Nb 3Sn wires in an Icology 908 conduit in the presence of oxygen can decrease the conduit's fracture toughness. This may be avoided by reacting in a reducing atmosphere of 5% hydrogen-95% argon. The effects of the hydrogen reaction on the

Precessional switching in submicrometer spin valves

April 22, 2002
Author(s)
Shehzaad F. Kaka, Stephen E. Russek
Small spin valves are switched using a subnanosecond field pulse applied alongdg the magnetization hard-axis fields increases as the duration is decreased from 325 to 230 ps. This indicates a large-angle precessional motion in response to the transverse

IEEE 802.16 Marks Broadband Wireless Access Maturation

April 15, 2002
Author(s)
Roger Marks
With the completion of the IEEE Standard 802.16 WirelessMAN {trademark} air interface, broadband wireless access (BWA) is reaching maturity as a serious alternative for broadband access deployment. Once the 802.16 amendment is complete, the standard will

Broadband Direct Detection Submillimeter Spectrometer with Multiplexed Superconducting Transition Edge Thermometer Bolometers

March 1, 2002
Author(s)
D. J. Benford, Troy A. Ames, Jay A. Chervenak, S. H. Mosely, Rick A. Shafer, Johannes G. Staguhn, George M. Voellmer, Francois Pajot, Cyrille Rioux, Thomas G. Phillips, Bruno Maffei, Kent D. Irwin
We present performance results based on the first astronomical use of multiplexed superconducting bolometers. The Fabry-Perot Interferometer Bolometer Research Experiment (FIBRE) is a broadband submillimeter spectrometer that achieved first light in June

The superconducting strand for the CMS solenoid conductor

March 1, 2002
Author(s)
B Cure, B Blau, D Campi, Loren F. Goodrich, I L. Horvath, F Kircher, R Liikamaa, J Sepp{umlat}al{umlat}a, R P. Smith, J Teuho, L Vieillard
The Compact Muon Solenoid (CMS) is one of the general-purpose detectors to be provided for the LHC project at CERN. The design filed of the CMS superconducting magnet is 4 T, the magnetic length is 12.5 m and the free bore is 6 m. Approximately 2000 km of

Analysis of Electrically-Short Dipoles with a Nonlinear Load, Revisited

February 1, 2002
Author(s)
John M. Ladbury, Dennis G. Camell
We reexamine the characteristics of electrically short dipoles with nonlinear loads and, specifically, the early work of Motohisa Kanda. Although this problem has been examined in great detail in the past, some errors have not been addressed. We describe

Exchange bias and anisotropy in the Fe/KCoF 3 structure

February 1, 2002
Author(s)
Leszek Malkinski, Nicholas Cramer, Andrew Hutchinson, Robert E. Camley, Zbigniew J. Celinski, Danuta Skrzypek, Ronald B. Goldfarb
A new type of ferromagnet/antiferromagnet structure (fe/KCoF 3) was deposited by molecular beam epitaxy. Unidirectional and uniaxial anisotropies of 5.1 and 3.4 kA/m were measured at 23 K using ferromagnetic resonance. Magnetization measurements at 5 K

On Determining the Maximum Emissions From Electrically Large Sources

February 1, 2002
Author(s)
Perry F. Wilson, David A. Hill, Christopher L. Holloway
This paper examines the use of measurements of the total radiated power from an arbitrary source, combined with theory-based directivity or quality factor estimates, to accurately predict the maximum electric field radiated by the source either at a line
Displaying 801 - 825 of 1560