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Search Publications

NIST Authors in Bold

Displaying 47801 - 47825 of 73697

Evaluation of Charge Penetration Between Distributed Multipolar Expansions

May 1, 2000
Author(s)
M A. Freitag, M S. Gordon, J H. Jensen, W J. Stevens
A formula to calculate the charge penetration energy that results when two charge densities overlap has been derived for molecules described by an effective fragment potential (EFP). The method has been compared with the ab initio charge penetration, taken

Exchange Bias Relaxation in CoO-Biased Films

May 1, 2000
Author(s)
Robert McMichael, Chang H. Lee, Mark D. Stiles, F Serpa, P J. Chen, William F. Egelhoff Jr.
Because the memory of the bias direction is carried by the antiferromagnetic order in exchange bias films, the stability of the antiferromagnetic order is critical to the existence of the exchange bias field. Ferromagnetic resonance was used to measure the

Experimental Determination of Electron Effective Attenuation Lengths in Silicon Dioxide Thin Films Using Synchrotron Radiation - I. Data Analysis and Comparisons

May 1, 2000
Author(s)
M Suzuki, H Ando, Yukihiru Higashi, H Takenaka, H Shimada, N Matsubayashi, M Imamura, S Kurosawa, S Tanuma, Cedric J. Powell
We have measured effective attenuation lengths (EALs) of 140 to 1100 eV electrons in ultrathin silicon dioxide layers using synchrotron radiation. These EALs were generally smaller than those reported previously although there was agreement with the values

Experimental Determination of Electron Effective Attenuation Lengths in Silicon Dioxide Thin Films Using Synchrotron Radiation - II. Effects of Elastic Scattering

May 1, 2000
Author(s)
Y Shimada, N Matsubayashi, M Imamura, M Suzuki, Yukihiru Higashi, H Ando, H Takenaka, S Kurosawa, S Tanuma, Cedric J. Powell
The effective attenuation lengths (EALs) of photoelectrons in thin silicon dioxide films on a Si(100) substrate were measured as a function of electron energy using synchrotron radiation as an energy-tunable excitation source. The ratios of EALs to

Experiments With Strontium in a Vapor Cell Magneto-Optic Trap

May 1, 2000
Author(s)
K R. Vogel, Tim P. Dinneen, Alan Gallagher, J L. Hall
In a ceramic vapor cell we have created a robust Sr magneto-optical trap that stores about 10 8 atoms with lifetimes > 200 ms. We eliminate the 5p 1P 1->4d 1 d2->5p 3P 2 leak and achieve a 10-fold improvement in trap lifetime by repumping the 5p 3Po.2 dark

Fibers, Percolation, and Spalling of High-Performance Concrete

May 1, 2000
Author(s)
Dale P. Bentz
While the strength and durability of high performance concretes (HPCs) are often greatly superior to conventional concretes under ambient conditions, their failure is sometimes rapid and dramatic during exposure to a fire, characterized by the explosive

Fire Performance of High Strength Concrete: Research Needs

May 1, 2000
Author(s)
Long T. Phan, Nicholas J. Carino
A compilation of fire test data which shows distinct behaviroal differences between HSC and NSC at elevated temperature is presented. The differences are most pronounced in the temperature range of 20 {degrees}C to 400 {degrees}C. What is more important is

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

Image Compression and Deblurring

May 1, 2000
Author(s)
Anastase Nakassis, Alfred S. Carasso
What follows is the description of an experiment in which we investigated the possibility that blurring techniques and lossless compression could be combined as an alternative to lossy compression techniques for still images. Our results show that while

Imaging of Composite Defects and Damage Using Optical Coherence Tomography

May 1, 2000
Author(s)
Joy Dunkers, M J. Everett, D P. Sanders, Donald L. Hunston
The Composites Group at the National Institute of Standards and Technology has found optical coherence tomography (OCT) to be a powerful tool for non-destructive characterization of polymer matrix composites. Composites can be made more cost competitive by

IMPI: Making MPI Interoperable

May 1, 2000
Author(s)
William L. George, John G. Hagedorn, J E. Devaney
The Message Passing Interface (MPI) is the de facto standard for writing parallel scientific applications in the message passing programming paradigm. Implementations of MPI were not designed to interoperate thus limiting the environments in which parallel

Improved Time-Base for Waveform Parameter Estimation

May 1, 2000
Author(s)
Bryan C. Waltrip, Owen B. Laug, Gerard N. Stenbakken
An improved gated-oscillator time-base and associated auto-calibration algorithm for use in a high-accuracy sampling waveform acquistion system are described. The time-base architecture consists of a stable 100 MHz gated-oscillator, 24-bit counter chain

Improvements in the NIST Cryogenic Thermal Transfer Standard

May 1, 2000
Author(s)
Thomas E. Lipe Jr., Joseph R. Kinard Jr., Carl D. Reintsema
Recent improvements in the prototype of an ac-dc thermal transfer standard operating at cryogenic temperatures are described. Descriptions of two new transmission lines are presented, along with ac-dc difference measurements and Fast-Reversed DC (FRDC)

Infrared Spectral Responsivity Scale of NIST

May 1, 2000
Author(s)
George P. Eppeldauer, Alan L. Migdall
An ambient temperature Infrared Spectral Responsivity Comparator Facility has been developed at NIST to calibrate infrared detectorsand radiometers for spectral and spatial responsivities. Test detectors are substituted for working- or transfer-standard
Displaying 47801 - 47825 of 73697
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