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Displaying 576 - 600 of 1947

On the limits of spin-exchange optical pumping of 3He

July 2, 2014
Author(s)
Thomas R. Gentile, T G. Walker, E Babcock, Qiang NMN Ye, Wangchun Chen
Using diode bar lasers spectrally narrowed with chirped volume holographic gratings (VHGs), we have obtained an improvement in the 3He polarization achievable by spin-exchange optical pumping (SEOP). As compared to our past results with lasers narrowed

Time-resolved surface infrared spectroscopy during atomic layer deposition

September 10, 2013
Author(s)
Brent A. Sperling, John J. Hoang, William A. Kimes, James E. Maslar
This work presents a novel method for obtaining surface infrared spectra with sub-second time resolution during atomic layer deposition (ALD). Using a rapid-scan Fourier transform infrared (FT-IR) spectrometer, we obtain a series of interferograms (120 ms)

Major International Lead (Pd)-Free Solder Studies

October 16, 2008
Author(s)
C A. Handwerker, E E. de Kluizenaar, K Suganuma, Frank W. Gayle
Beginning in 1991, the microelectronics community worldwide became increasingly aware of the possibility of being required, by law, by tax, or by market pressure, to replace tin-lead eutectic solders in electronic assemblies. Over the ten years that

Cold Discharge of CF 3 I in a Simulated Aircraft Engine Nacelle

June 1, 2003
Author(s)
Jiann C. Yang, Samuel L. Manzello, Marc R. Nyden, M D. Connaghan
An aircraft engine nacelle simulator was built to study the dispersion behavior of CF3I, a potential halon 1301 (CF3Br) replacement, at an extremely cold temperature (nominally 40 C). The experimental fixture consists of a simulated engine nacelle with

Measures for Spectral Quality in Low-Voltage X-Ray Microanalysis

November 1, 2000
Author(s)
Dale E. Newbury
Characteristic x-ray production with energetic electrons depends strongly on the overvoltage, the ratio of the incident beam energy to the critical excitation energy for the atomic species of interest. Low voltage x-ray microanalysis (beam energy < 5 keV)

NIST Atomic Spectra Database (1998)

August 1, 1998
Author(s)
Yuri Ralchenko
We put Version 1 of this database online as an interactive Web server in 1995. Our first version has data on atomic energy levels for some 500 spectra, transition probability data for spectra of the iron-group elements, and wavelength data for spectra of a

Flow Induced by Fire in a Compartment.

July 1, 1982
Author(s)
Kenneth D. Steckler, Jim G. Quintiere, William J. Rinkinen
… developing fire. The mass flow rate through the door or window opening and bounds on the fire plume entrainment rate …

The National Marine Mammal Tissue Bank Specimen Inventory Report

January 29, 2026
Author(s)
Jennifer Ness, Debra Ellisor, Jennifer Hoguet, Amanda Moors, Amanda Capuano, Rebecca Pugh
This report provides a brief background of the National Marine Mammal Tissue Bank (NMMTB), information on the composition of the collection, policies for specimen use, and links to a downloadable and searchable specimen inventory. The inventory covers

Cryptography Standards in Quantum Time - New wine in old wineskin?

August 17, 2017
Author(s)
Lidong Chen
The National Institute of Standards and Technology (NIST) of the U.S. Government announced a call for proposals for quantum-resistant public-key cryptographic algorithms on December 15, 2016. The scope of the call covers all public-key cryptographic

The Evolution of Time Measurement, Part 2 - Quartz Clocks

September 30, 2011
Author(s)
Michael Lombardi
A historical article about the origins and the development of quartz clocks and oscillators (Part II of a IV-part series). It describes the discovery of piezoelectricity, the development of the first quartz oscillators, how quartz oscillators were

Update on a Comparison of Cesium Fountain Primary Frequency Standards

July 31, 2011
Author(s)
Thomas E. Parker
An update to a previous long term frequency comparison of cesium fountain primary frequency standards has been made. This update covers the approximate three year interval from March 2008 to March 2011 and also includes two new standards. Also, simulated
Displaying 576 - 600 of 1947
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