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Search Publications

NIST Authors in Bold

Displaying 28401 - 28425 of 73697

On the determination of C0 (or A0), D0K, H0K, and some dark states for symmetric-top molecules from infrared spectra without the need for localized perturbations

May 4, 2009
Author(s)
Alfons Weber, Jintao Zhang, Tony Masiello, Thomas A. Blake, J Nibler
For symmetric top molecules, the normal k = 0, l = 0 and k = 1, l = 1 selection rules for parallel and perpendicular bands, respectively, do not allow the determination of the K-dependent rotational constants, C0 (or A0), D0K, and H0K. However, we

OntoSTEP: OWL-DL Ontology for STEP

May 4, 2009
Author(s)
Sylvere Krima, Raphael Barbau, Xenia Fiorentini, Sudarsan Rachuri, Ram D. Sriram
The Standard for the Exchange of Product model data (STEP) [1] contains product information mainly related to geometry. The modeling language used to develop this standard, EXPRESS, does not have logical formalism that will enable rigorous semantics. In

Phonon softening and anomalous mode near the x c = 0.5 quantum critical point inCa 2-x Sr x RuO 4

May 4, 2009
Author(s)
R. G. Moore, M. D. Lumsden, M. B. Stone, Jiandi Zhang, Ying Chen, Jeffrey Lynn, R. Jin, D Mandrus, E. W. Plummer
Inelastic neutron scattering is used to measure the temperature-dependent phonon dispersion in Ca2−xSrxRuO4(x=0.4,0.6). The in-plane Σ4 octahedral tilt mode softens significantly at the zone boundary of the high-temperature tetragonal (HTT) I41/acd

Calculation of Relative Thermal Elongation of Structural Steels

May 2, 2009
Author(s)
Dilip K. Banerjee, Ursula R. Kattner
In the recent past, there has been a number of studies toward predicting the thermal and structural behavior of components subjected to elevated temperature due to an exposure to fire. Numerical modeling has been applied quite extensively toward this end

Projector flux from color primaries

May 2, 2009
Author(s)
Edward F. Kelley
A standard methodology exists for estimating the flux from front projection displays by sampling the projected illuminance of a white source signal. With the advent and use of white projection primaries, a dramatic increase in flux can be achieved over the

Quantum radiometry

May 2, 2009
Author(s)
Sergey V. Polyakov, Alan L. Migdall
We review radiometric techniques that take advantage of photon counting and stem from the quantum laws of nature. We present a brief history of metrological experiments and review the current state of experimental quantum radiometry.

Calibration of Speed Enforcement Down-the-Road Radars

May 1, 2009
Author(s)
John R. Jendzurski, Nicholas G. Paulter Jr.
We examine the measurement uncertainty associated with different methods of calibrating the ubiquitous down-the-road (DTR) radar used in speed enforcement. These calibration methods include the use of audio frequency sources, tuning forks, a fifth wheel

Character contrast under uniform ambient conditions

May 1, 2009
Author(s)
Edward F. Kelley, John Penczek, Paul A. Boynton
The measurement of small-area black regions on a white screen (such as a character stroke) can be subject to large errors because of veiling glare in the detector. Using replica masks can enable more accurate measurements of small-area-black and character

Cut it out!

May 1, 2009
Author(s)
Isabel M. Beichl, Francis Sullivan
This is a tutorial article on a probabilistic method for finding minimum cut sets of a connected graph.

Fourier Transform Spectrometry with a Near Infrared Supercontinuum Source

May 1, 2009
Author(s)
Chris A. Michaels, Tony Masiello, Pamela M. Chu
Optical fiber based supercontinuum light sources combine the brightness of lasers with the broad bandwidth of incandescent lamps and thus are promising candidates for sources in spectroscopic applications requiring high brightness and broad bandwidth. Near

Observation of a 2D Bose-gas: from thermal to fractured quasi-condensate to superfluid

May 1, 2009
Author(s)
Pierre Clade, Changhyun Ryu, Anand Ramanathan, Kristian Helmerson, William D. Phillips
This paper presents experimental results on a Bose gas in a quasi-2D geometry near the Berezinskii,Kosterlitz and Thouless (BKT) transition temperature. By measuring the density profile, in situ and after time of flight, and the coherence length of the gas

Plant and fungal Fpg homologs are formamidopyrimidine DNA glycosylases but not 8-oxoguanine DNA glycosylases

May 1, 2009
Author(s)
Scott D. Kathe, Ramiro Barrantes-Reynolds, Pawel Jaruga, Michael Newton, Cynthia Burrows, Viswanath Bandaru, Miral M. Dizdar, Jeffrey Bond, Susan Wallace
Formamidopyrimidine DNA glycosylase (Fpg) and endonuclease VIII (Nei) share an overall common three dimensional structure and primary amino acid sequence in conserved structural motifs but have different substrate specificities, with bacterial Fpg proteins

Potential Primary Measurement Tool for the Quantification of DNA

May 1, 2009
Author(s)
Ryan G. Brennan, Savelas A. Rabb, Marcia J. Holden, Michael R. Winchester
An automated sample introduction system, utilizing a demountable direct injection high efficiency nebulizer (d DIHEN), is successfully incorporated for the first time with an inductively coupled plasma optical emission spectrometer (ICP-OES) for the

Predicting the Permeability of Pervious Concretes from Planar Images

May 1, 2009
Author(s)
Milani S. Sumanasooriya, Dale P. Bentz, Narayanan Neithalath
This paper discusses the reconstruction of three-dimensional material structures of pervious concretes using two-dimensional digital images obtained from actual specimens, and computational permeability predictions using these reconstructed three

Quantitative Measurement of the Polydispersity in the Extent of Functionalization of Glass Forming Resorcinarenes

May 1, 2009
Author(s)
William E. Wallace, Kathleen M. Flynn, Charles M. Guttman, David L. VanderHart, Vivek M. Prabhu, Anuja De Silva, Nelson Felix, Christopher K. Ober
The polydispersity in the degree of functionalization for two calix[4]resorcinarenes was determined by measuring their molecular mass distribution with matrix-assisted laser desorption/ionization time of flight mass spectrometry. A mathematical method for

Single-photon Sources

May 1, 2009
Author(s)
Matthew T. Rakher
Quantum-dot-based single-photon sources are fast and efficient and remain at the forefront of candidates for use in quantum information schemes.
Displaying 28401 - 28425 of 73697
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