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Displaying 26851 - 26875 of 73832

Dual frequency combs at 3.4 mm with subhertz residual linewidths

May 1, 2010
Author(s)
Esther Baumann, Fabrizio R. Giorgetta, Ian R. Coddington, William C. Swann, Nathan R. Newbury
Two coherent 1.5-µm frequency combs are transferred to 3.4 µm by difference frequency generation with a 1064 nm cw laser. From a multi-heterodyne measurement, the residual linewidth between the comb teeth is resolution-limited at 200 mHz.

Dual frequency-comb sampling of a quasi-thermal incoherent light source

May 1, 2010
Author(s)
Fabrizio R. Giorgetta, Ian R. Coddington, William C. Swann, Esther Baumann, Nathan R. Newbury
Dual, coherent frequency combs are used to measure the spectrum of an incoherent, quasi-thermal source through Fourier spectroscopy. The source spectrum is acquired over 1THz bandwidth with an absolute frequency accuracy set by the combs.

Fast and accurate comb-based spectral analysis of a frequency agile CW laser

May 1, 2010
Author(s)
Fabrizio R. Giorgetta, Ian R. Coddington, Esther Baumann, William C. Swann, Nathan R. Newbury
The time-resolved frequency spectrum of a frequency agile CW laser is measured with a 300υs update rate and 3 kHz resolution/accuracy over a 28 nm wavelength range with a coherent dual comb setup.

Frequency-Dependent Charge-Pumping: The Depth Question Revisited

May 1, 2010
Author(s)
Fan Zhang, Kin P. Cheung, Jason Campbell, John S. Suehle
A popular defect depth-profiling technique, frequency-dependent charge-pumping is carefully re-examined. Without complicated math of modeling, the physics behind the technique is examined clearly. It is shown that there is no unique relationship between

Machine Learning Study of the Heulandite Family of Zeolites

May 1, 2010
Author(s)
Shujiang Yang, Mohammed Lach-hab, Estela Blaisten-Barojas, Xiang Li, Vicky L. Karen
Heulandite and clinoptilolite form the most abundant family of natural zeolite crystals. The topology of both of them is characterized by the framework type HEU. Despite many studies on these crystals, the mineral assignment to a zeolite as heulandite or

NEW DESIGNS FOR HIGH-RESISTANCE STANDARD RESISTORS

May 1, 2010
Author(s)
Andrew J. Dupree, Dean G. Jarrett
Discussed are the efforts undertaken at the National Institute of Standards and Technology to create a new set of high-resistance standards (specifically the 10 MΩ to 100 MΩ range) using newer more stable film-type resistors. The history of film-type

NEXT GENERATION GUARDED HAMON TRANSFER STANDARDS FOR HIGH RESISTANCE

May 1, 2010
Author(s)
Dean G. Jarrett, Andrew J. Dupree
Guarded Hamon transfer standards have been used at NIST for decades for scaling to high resistance levels. A recent project has been undertaken to apply improved designs in guarded Hamon transfer standards to the 1 MΩ to 100 MΩ ranges with the larger goal

Probing Stress Effects in Single Crystal Organic Transistors by Scanning Kelvin Probe Microscopy

May 1, 2010
Author(s)
L C. Teague, Oana Jurchescu, Curt A. Richter, Sanker Subramanian, John E. Anthony, Thomas Jackson, David J. Gundlach, James Kushmerick
We report scanning Kelvin probe microscopy SKPM of single crystal difluoro bistriethylsilylethynyl anthradithiophene diF-TESADT organic transistors. SKPM provides a direct measurement of the intrinsic charge transport in the crystals independent of contact

Reactive MALDI Mass Spectrometry of Saturated Hydrocarbons: A Theoretical Study

May 1, 2010
Author(s)
William E. Wallace, Lewandowski Hans, Meier J. Robert
Recently it has been shown that the cobaltocenium cation, prepared by the laser ablation of a CoCp(CO)2/fullerene matrix, may react with alkanes and polyethylenes in the gas phase via a dehydrogenation reaction to produce [Co(Cp)2(alkadiene)]+ ions without

Strategies for Concordance Testing

May 1, 2010
Author(s)
Carolyn R. Steffen, David L. Duewer, Margaret C. Kline, John M. Butler
Concordance evaluations are important to conduct to determine if there are any allelic dropout or “null alleles” present in a data set. These studies are based on the fact that there are a variety of commercial short tandem repeat (STR) multiplex kits

Waveform metrology and a quantitative study of regularized deconvolution

May 1, 2010
Author(s)
Paul D. Hale, Andrew M. Dienstfrey
We present methodology and preliminary results of a Monte-Carlo simulation to perform a quantified analysis of regularized deconvolution in the context of full waveform metrology. We analyze the behavior of different regularized inversion methods with

Comparison of Air Kerma and Absorbed Dose to Water Measurements of Co-60 Radiation Beams in Radiotherapy

April 30, 2010
Author(s)
Ronaldo Minniti, I. Csete, A.G. Leiton, V. Sochor, A. Lapenas, J.-E Grindborg, I Jokelainen, H. Bjerke, J. Dobrovodsky, A. Megzifene, H.J. Costas, R. Ivanov, B. Vekic, J. Kokocinski, H.J. Cardoso, L. Buermann, W. Tiefenboeck, G. Stucki, E. van Dijk , M P. Toni, J.P. McCaffrey, C.N.M. da Silva, I Kharitonov, D. Webb, M Saravi, F. Delaunay
The results of the 25 participants of the EUROMET.RI(I)-K1 and EUROMET.RI(I)-K4 key comparisons are reported to support their relevant CMC claims being published or going to be published by the participant laboratories. The measured quantities were the air

Measuring the effects of low energy ion milling on the magnetization of Co/Pd multilayers using scanning electron microscopy with polarization analysis

April 30, 2010
Author(s)
Benjamin James McMorran, Aaron C. Cochran, Randy K. Dumas, Kai Liu, Paul Morrow, Daniel T. Pierce, John Unguris
The dependence of the magnetic properties of Co/Pd multilayer films with very thin individual layers, Co(0.4nm)/Pd(0.6nm), on the energy of ion milling is investigated using scanning electron microscopy with polarization analysis (SEMPA). The effect of Ar

Metrology of Molecular Devices made by Flip Chip Lamination

April 30, 2010
Author(s)
Christina A. Hacker, Mariona Coll Bau, Curt A. Richter
Scaling of conventional electronics has continued unabated to dimensions approaching fundamental physical limits. As technology continues to evolve there are increasing demands to identify alternate routes of performing electrical functions. One potential

Resonance Strength in 22Ne(p,gamma)23Na from Depth Profiling in Aluminum

April 30, 2010
Author(s)
R Longland, C. Iliadis, J. Cesaratto, A E. Champagne, S Daigle, J.R. Newton, Ryan P. Fitzgerald
The novel method for extracting absolute resonance strengths has been investigated. By implanting 22Ne ions into a thick aluminum backing, and simultaneously measuring the 22Ne + p and 27Al+p reactions, the strength of the Elab,r = 479 keV resonance in

TRECVID 2009 -- Goals, Tasks, Data, Evaluation Mechanisms and Metrics

April 30, 2010
Author(s)
Paul D. Over, George M. Awad, Jonathan G. Fiscus, Martial Michel, Alan Smeaton, Wessel Kraaij
The TREC Video Retrieval Evaluation (TRECVID) 2009 was a TREC-style video analysis and retrieval evaluation, the goal of which was to promote progress in content-based exploitation of digital video via open, metrics-based evaluation. 63 teams from various
Displaying 26851 - 26875 of 73832
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