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Displaying 801 - 825 of 1184

Accurate Picometers for DC and Low-Frequency Displacement Measurement

April 6, 2009
Author(s)
Jon R. Pratt, Douglas T. Smith, Lowell Howard
We have developed a fiber-optic interferometer optimized for best performance in the frequency range from DC to 1 kHz, with displacement linearity of 1 % over a range of 25 nm, and noise-limited resolution of 2 pm [1]. The interferometer uses a tunable

Stress-strain behavior of rat pulmonary arteries

January 1, 2007
Author(s)
Elizabeth S. Drexler, J Wright, Andrew Slifka, Christopher N. McCowan, Dunbar Ivy, R Shandas
… artery. The difference in slope was significant (P < 0.05) for the circumferential orientations, and for the …

Reversible axial-strain effect in Y-Ba-Cu-O coated conductors

November 7, 2005
Author(s)
Najib Cheggour, John (Jack) W. Ekin, C. L. H. Thieme, Y Y. Xie, V Selvamanickam, Ron Feenstra
The recently discovered reversible strain effect in Y-Ba-Cu-O (YBCO) coated conductors contrasts with the general understanding that the effect of strain on critical-current density J c in practical high-temperature superconductors is determined only by

Chip-Scale Atomic Frequency References

September 16, 2005
Author(s)
John E. Kitching, Svenja A. Knappe, Li-Anne Liew, P Schwindt, Vladislav Gerginov, V Shah, John Moreland, Alan Brannon, J Breitbarth, Z Popovic, Leo W. Hollberg
We describe recent efforts at NIST to develop microfabricated, chip-scale atomic frequency references based on microfabrication techniques commonly used in micro electro mechanical systems (MEMS). These devices are projected to have a volume of 1 cm 3, a

Low-frequency noise measurements on commercial magnetoresistive magnetic field sensors

May 17, 2005
Author(s)
Nathan Stutzke, Stephen E. Russek, David P. Pappas, Mark Tondra
Low frequency noise was measured in the frequency range from 0.1 Hz to 10 kHz on a variety of commercially available magnetic sensors. The types of sensors investigated include anisotropic magnetoresistance (AMR), giant magnetoresistance (GMR), and tunnel

Magnetic and Structural Characterization and Ferromagnetic Resonance Study of Thin Film HITPERM Soft Magnetic Materials for Data Storage Applications

May 1, 2003
Author(s)
Hideyuki Okumura, D J. Twisselmann, Robert McMichael, M Q. Huang, Y N. Hsu, D E. Laughlin, M E. McHenry
… using a target composition of (Fe 70 Co 30 ) 88 }Zr 7 }B 4 }Cu 1 }. The as-deposited HITPERM film contains small … ribbons (1.55-1.62 T). The Lande g-factors (2.15 0.05)are typical of transition metals, particularly, of Fe. The …

Sapphire Statistical Strength Characterization

September 7, 2001
Author(s)
D R. McClure, R W. Cayse, S Goodrich, D McCullum, D C. Harris, K Lagerlof, C E. Patty, D H. Platus, Robert S. Polvani, David R. Black
… to failure was 2.85 s, but the observed median time was 4.05 s, indicating that the 4-point flexure strength provides a …

The NIST Industrial Thermometer Calibration Laboratory

June 1, 2001
Author(s)
C D. Vaughn, Gregory F. Strouse
The NIST Industrial Thermometer Calibration (ITC) Laboratory provides calibrations of industrial thermometers over the range from 196 C to 550 C. The different types of thermometers include liquid-in-glass (LiG), thermistors, thermocouples (

Superconducting Nb DHEB Mixer Arrays for Far-Infrared Spectroscopy

February 12, 2001
Author(s)
Eyal Gerecht, Carl D. Reintsema, Erich N. Grossman, A. L. Betz, R. T. Boreiko
We are developing a heterodyne focal plane array with up to eight elements to study lines with frequencies of 2 THz and above. It is intended for studies of the interstellar medium and planetary atmospheres. Our fabricatin process utilizes selective ion

Optical Tunnel-Trap Detector for Radiometric Measurements

October 1, 2000
Author(s)
John H. Lehman, Christopher L. Cromer
… 10 mm x 10 mm silicon photodiodes in a detector having a 7 mm diameter aperture. Spectral responsivity measurement … 12 mm diameter area, response variations are less than 0.05%. We have evaluated several fields-of-view and confirmed …

Hot-Electron Attenuation Lengths in Ultrathin Magnetic Films

May 1, 2000
Author(s)
R P. Lu, B A. Morgan, K L. Kavanagh, Cedric J. Powell, P J. Chen, F Serpa, W F. Egelhoff
Ballistic electron emission microscopy (BEEM) is used to measure hot electron transport across magnetic metal multilayers. Room temperature measurements in air have been carried out on Au/M/Si(100), Au/M/Au/Si(100) and Au/M/PtSi/Si diodes, that were

Size Effect for Specific Energy in Grinding of Silicon Nitride

April 1, 1999
Author(s)
T W. Hwang, Christopher J. Evans, S Malkin
An investigation is reported of the ?size effect? for specific energy in grinding of silicon nitride. Experimental measurements over a wide range of operating parameters using two different grit size diamond wheels show an increase in specific energy as

Warm-Hip Compaction of Attrition-Milled Iron Alloy Powders

January 1, 1999
Author(s)
J C. Rawers, Frank S. Biancaniello, Rodney D. Jiggetts, Richard J. Fields, Maureen E. Williams
Warm-HIP (Hot-Isostatic-Pressure) compaction of attrition-milled iron alloy powders resulted in production of high strength, fully-dense compacts of nanostructured iron alloy powders. Commercial development of nanostructured materials has been largely

Time Domain Modal Estimation

January 1, 1998
Author(s)
S Fahey, Jon R. Pratt
In a previous technical feature,2 we described some motives for performing structural dynamic tests and subsequently reviewed some frequency domain techniques for uncovering modal parameters. This time, we take up some applicable time domain algorithms by

Measurement Comparison of Stylus Radii

January 1, 1997
Author(s)
Jun-Feng Song, Theodore V. Vorburger
… as r=(1.70 +/-0.08)um, (1.67 +/-0.12)um and (1.74 +/-0.05)um (all with k>=2) corresponding to different daily …

Effect of CF3H and CF3Br on Laminar Diffusion Flames in Normal and Microgravity

October 16, 1995
Author(s)
B. A. VanDerWege, M T. Bush, S Hochgreb, Gregory T. Linteris
Due to the ban on production of bromotrifluoromethane (CF3Br) because of its high ozone destruction potential, there has been recent interest in finding a replacement for it for fire extinguishing applications. While a variety of potential replacements are
Displaying 801 - 825 of 1184
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