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Displaying 18551 - 18575 of 74071

A Two-Port Model for Antennas in an Arbitrary Environment

May 1, 2014
Author(s)
Jason B. Coder, John M. Ladbury, Mark Golkowski
We present an improved model for characterizing fundamental antenna parameters based on the concept of a passive realizable two-port network. The proposed model is consistent with circuit theory based approaches and allows for quantitative description and

First Accuracy Evaluation of NIST-F2

May 1, 2014
Author(s)
Thomas P. Heavner, Steven R. Jefferts, Jon H. Shirley, Thomas E. Parker, Elizabeth A. Donley, Neil Ashby, Stephan E. Barlow, Filippo Levi, Giovanni Costanzo
We report the first accuracy evaluation of NIST-F2, a second generation laser-cooled Cesium fountain primary standard developed at NIST with a cryogenic (Liquid Nitrogen) microwave cavity and flight region. The 80 K atom interrogation environment reduces

IAQ Specifications for a Netzero Energy Research Home

May 1, 2014
Author(s)
Andrew K. Persily, Lisa C. Ng
The National Institute of Standards and Technology (NIST) recently constructed the Net Zero Energy Research Test Facility (NZERTF) to demonstrate a range of technologies in support of achieving netzero or near zero residential buildings (1). The energy

Measuring the Neutron Lifetime Using Magnetically Trapped Neutrons

May 1, 2014
Author(s)
Hans P. Mumm, Alan Keith Thompson, Paul R. Huffman, Christopher O'Shaughnessy, Kevin J. Coakley, Robert Golub, John M. Doyle, Steve K. Lamoreaux, P.-N. Seo, C E. Mattoni, S N. Dzhosyuk, L Yang, Grace L. Yang, Karl W. Schelhammer, Christopher M. Swank
The neutron beta-decay lifetime plays an important role, both in understanding weak interactions within the framework of the Standard Model, and in theoretical predictions of the primordial abundance of 4He in Big Bang Nucleosynthesis. In previous work, we

Multiheterodyne spectroscopy with optical frequency combs generated from a continuous-wave laser

May 1, 2014
Author(s)
David A. Long, Adam J. Fleisher, Kevin O. Douglass, Stephen E. Maxwell, Katarzyna E. Bielska, Joseph T. Hodges, David F. Plusquellic
Dual-drive Mach-Zehnder modulators were utilized to produce power-leveled optical frequency combs (OFCs) from a continuous-wave laser. The resulting OFCs contained up to fifty unique frequency components and spanned more than 200 GHz. Simple changes to the
Displaying 18551 - 18575 of 74071