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Displaying 276 - 300 of 713

Role of Oxygen Pressure during Deposition on the Microwave Properties of YBCO Films

June 1, 1999

Author(s)

David A. Rudman, F. J. Stork, James Booth, J. Y. Juang, Leila R. Vale, G. J. Beatty, C. I. Williams, James A. Beall, Ronald H. Ono, S. B. Qadri, M. S. Osofsky, E. F. Skelton, John H. Claassen, G. Gibson, J. L. MacManus-Driscoll, N. Malde, L. F. Cohen

We have studied the effect of oxygen pressure (PO 2) during pulsed laser deposition on the properties of YBCO films, with particular attention to the low power microwave surface resistance R s.

Simultaneous Optimization of Linear and Nonlinear Microwave Response of YBCO Films

June 1, 1999

Author(s)

James Booth, James A. Beall, David A. Rudman, Leila R. Vale, Ronald H. Ono, Christopher L. Holloway, S. B. Qadri, M. S. Osofsky, E. F. Skelton, J. H. Claasen, G. Gibson, J. L. MacManus-Driscoll, N. Malde, L. F. Cohen

We present results of a systematic study of the effect of film deposition temperture on both the linear and nonlinear response of super-conducting Yba 2Cu 3O7-γ^ (YBCO) thin films and devices at microwave frequencies. Measurements of the unpatterned films

Superconducting Thin-Film Transformers at Microwave Frequencies

June 1, 1999

Author(s)

A. H. Miklich, J. X. Przybysz, T. J. Smith, Samuel Benz, Todd E. Harvey

We describe the use of thin-film superconducting transformers at frequencies up to 20 GHz. Transformers with turns ratios of 2,3, and 7 were fabricated out of Nb and tested in a liquid-He Dewar. The measured S-parameters showed considerably less bandwidth

Third Harmonics Generation from Y-Ba-Cu-O Bicrystal Josephson Junctions in Coplanar Waveguides

June 1, 1999

Author(s)

Hisashi Shimakage, James Booth, Leila R. Vale, Ronald H. Ono

199 Hg^+^ Optical Frequency Standard: Progress Report

April 1, 1999

Author(s)

R J. Rafac, B. A. Young, J. E. Cruz, James A. Beall, J. C. Bergquist, Wayne M. Itano, David J. Wineland

AC and DC Bipolar Voltage Source Using Quantized Pulses

April 1, 1999

Author(s)

Samuel Benz, Clark A. Hamilton, Charles J. Burroughs, Todd E. Harvey

Deployment of a Compact, Transportable, Fully Automated Josephson Voltage Standard

April 1, 1999

Author(s)

Stuward L. Kupferman, Clark A. Hamilton

A compact, transportable, Josephson voltage standard, first reported at CPEM96, has now been field tested and has had ten months of use as a primary standard by National Aeronautics and Space Administration (NASA) laboratories. We discuss here its

Programmable 1 V DC Voltage Standard

April 1, 1999

Author(s)

Charles J. Burroughs, Samuel Benz, Clark A. Hamilton, Todd E. Harvey

We have developed a Josephson voltage standard that produces intrinsically stable voltages that are programmable of 32 768 SNS (superconductor-normal-superconductor) Josephson junctions. The output can source or sink up to 2 mA and thus has high noise

Improved VO 2 Microbolometers for Infrared Imaging: Operation on the Semiconducting-Metallic Phase Transition with Negative Electrothermal Feedback

January 1, 1999

Author(s)

Carl D. Reintsema, Erich N. Grossman, Jonathan A. Koch

We have investigated the performance of VO 2 microbolometers biased on the semiconducting-metal phase transition with negative electrothermal feedback. We deposited crystalline thin films of phase-pure VO 2, patterned these films into useful test

Active Cavity Absolute Radiometer Based on High-Tc Superconductors

December 31, 1998

Author(s)

Joseph P. Rice, Steven R. Lorentz, Raju V. Datla, Leila R. Vale, David A. Rudman, M. L. Sing, D. Robbes

Chaos

December 31, 1998

Author(s)

Richard L. Kautz

Lithographic Dipole Antenna Properties at 10 fm Wavelength: Comparison of Method-of-Moments Predicitions with Experiment

December 31, 1998

Author(s)

Erich N. Grossman, Jonathan A. Koch, Carl D. Reintsema, A. Green

Dipole antennas designed for operation at 10 5m wavelength have been fabricated by optical lithography and their properties measured by detection of CO 2 laser rediation in integrated thin-film bolometers. We find a remarkably strong increase in cross

Multilayer Processing of High-T c Films and Stacked Bicrystal Josephson Junctions

December 31, 1998

Author(s)

H. Q. Li, Ronald H. Ono, David A. Rudman, Leila R. Vale, Sy-Hwang Liou

The Fourth Interlaboratory Comparison of 10 V Josephson Voltage Standards in North America

December 31, 1998

Author(s)

Chih-Ming Wang, Clark A. Hamilton

Doping Effects and Reversibility Studies on Gas-Exposed alpha-Sexithiophene Thin Films

December 25, 1998

Author(s)

C Kendrick, Stephen Semancik

Research on the electronic applications of organic semiconductors is growing rapidly, and both polymeric and small molcule organics are being used in the fabrication of LEDs, transistors, and biological/chemical sensors. As a part of the chemical

Specific NIST Projects in Support of the NIJ Concealed Weapon Detection and Imaging Program

November 1, 1998

Author(s)

Nicholas G. Paulter Jr.

The Electricity Division of the National Institute of Standards and Technology is developing revised performance standards for hand-held (HH) and walk-through (WT) metal weapon detectors, test procedures and systems for these detectors, and a detection

Microwave Power Handling in Engineered Yba 2 Cu 3 O^d6-d Grain Boundaries

October 12, 1998

Author(s)

Y. M. Habib, D. E. Oates, G. Dresselhaus, M. Dresselhaus, Leila R. Vale, Ronald H. Ono

Microwave-frequency (rf) power-dependence measurements performed on thin-film Yba 2Cu 3O^d7-δ grain boundaries engineered on sapphire bicrystal substrates with misorientation angles of θ=20, 50, 100, and 240 are presented. The data are compared to

A Bibliography of Publications of the NIST Electromagnetic Technology Division

September 1, 1998

Author(s)

A. G. Bradford

This bibliography lists the publications of the staff of the Electromagnetic Technology Division of NIST during the period from January 1970 through July 1999. The bibliography is divided into two general sections: (a) Cryoelectronic Metrology and (b)

Application of Microcalorimeter EDS X-Ray Detectors to Particle Analysis

September 1, 1998

Author(s)

Alain C. Diebold, David A. Wollman, Kent D. Irwin, John M. Martinis, B. H. Liu

Microcalorimeter EDS with 3 eV Energy Resolution

August 1, 1998

Author(s)

David A. Wollman, Kent D. Irwin, Gene C. Hilton, L L. Dulcie, Norman F. Bergren, Dale Newbury, John M. Martinis

AC and DC Voltage Source Using Quantized Pulses

July 1, 1998

Author(s)

Samuel Benz, Clark A. Hamilton, Charles J. Burroughs, Laurie Christian, Todd E. Harvey

Microcalorimeter EDS Measurements of Chemical Shifts in Fe Compounds

July 1, 1998

Author(s)

David A. Wollman, Dale E. Newbury, Gene C. Hilton, Kent D. Irwin, L L. Dulcie, Norman F. Bergren, John M. Martinis

Chemical shifts result from changes in electron binding energies with the chemical environment of atoms. In x-ray spectra, chemical shifts lead to changes in x-ray peak positions, relative peak intensities, and peak shapes. These chemical bonding effects

Programmable 1 Volt DC Voltage Standard

July 1, 1998

Author(s)

Charles J. Burroughs, Samuel Benz, Clark A. Hamilton, Todd E. Harvey

Thermoelectric Transfer Difference of Thermal Converters Measured with a Josephson Source

July 1, 1998

Author(s)

Charles J. Burroughs, Samuel Benz, Clark A. Hamilton, Todd E. Harvey, Joseph R. Kinard Jr., Thomas E. Lipe Jr., H. Sasaki

Pulse-Driven Josephson Digital/Analog Converter

June 1, 1998

Author(s)

Samuel Benz, Clark A. Hamilton, Charles J. Burroughs, Todd E. Harvey, Laurie Christian, J. X. Przybysz

We have designed and demonstrated a pulse-driven Josephson digital/analog converter. When used as a programmable voltage standard, this device can synthesize metrologically accurate ac waveforms as well as stable dc voltages. We show through simulations

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