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Displaying 45726 - 45750 of 74178

All-Optical Atomic Clocks

January 1, 2001
Author(s)
Robert E. Drullinger, T Udem, Scott A. Diddams, K R. Vogel, Christopher W. Oates, E A. Curtis, W D. Lee, Wayne M. Itano, Leo W. Hollberg, James C. Bergquist

An Analysis of Combined CFD and Multizone IAQ Model Assembly Issues

January 1, 2001
Author(s)
Amy Musser
This study considers the situation of two isothermal rooms linked to one another via an opening of varying size. Air and a neutrally buoyant contaminant are transferred through the opening in an essentially one way flow situation, driven by forced

An Expert Rule Set For Fault Detection In Air-Handling Units

January 1, 2001
Author(s)
J House, H Vaezi-Nejad
This paper presents an expert rule set for air-handling units (AHUs) and examines the performance of the rule set using simulation and field data. APAR (air-handling unit performance assessment rules), the software implementation of the rule set, is first

An Investigation of Refrigerant Void Fraction in Horizontal, Microfin Tubes

January 1, 2001
Author(s)
David A. Yashar, M J. Wilson, HM R. Kopke, D M. Graham, J C. Chato, TJD A. Newell
A series of experiments to determine void fraction in both condensation and evaporation have been performed in horizontal microfin tubes with refrigerants R134a and R410A. Mass flux varied from 75 kg/m2-s to 700 kg/m2-s and average test section quality

An Optical Clock Based on a Single Trapped Hg + Ion

January 1, 2001
Author(s)
Scott A. Diddams, T Udem, K R. Vogel, Christopher W. Oates, E A. Curtis, W D. Lee, Wayne M. Itano, Robert E. Drullinger, James C. Bergquist, Leo W. Hollberg
Microwave atomic clocks have been the de facto standards for precision time and frequency metrology over the past 50 years, finding widespread use in basic scientific studies, communications, and navigation. However, with its higher operating frequency, an

An SDR-Based Performance Measurement of LTE and WLAN Coexistence

January 1, 2001
Author(s)
Nadia Yoza Mitsuishi, Yao Ma, Jason Coder
In this paper, we report on a software-defined radio (SDR) based test setup to emulate and evaluate the performance of a few wireless coexistence scenarios. The first case we study consists of two long-term evolution (LTE) downlink channels from adjacent

Analysis of dimensional metrology standards:

January 1, 2001
Author(s)
John Evans, Simon Frechette, John Horst, Hui Huang, Thomas Kramer, Elena Messina, Fred Proctor, Bill Rippey, Harry Scott, Ted Vorburger, Al Wavering

Anomalous Modes Underpin Vortex Dynamics in Confined Bose-Einstein Condensates

January 1, 2001
Author(s)
D L. Feder, A A. Svidzinsky, A L. Fetter, Charles W. Clark
The dynamics of vortices in trapped Bose-Einstein condensates are investigated both analytically and numerically. In axially symmetric traps, the critical rotation frequency for metasability of an isolated vortex coincides with the largest vortex

Antibody-Antigen Adhesion Studies Using Optical Tweezers

January 1, 2001
Author(s)
S Kulin, Rani B. Kishore, Kristian Helmerson, Joseph B. Hubbard
Multivalent molecular adhesion processes play a key role in a wide variety of biological phenomena, such as immune response, infections, as well as cellular migration, communication, and differentiation. In many cases adhesion is mediated by interactions

Apparatus for Screening Fire Suppression Efficiency of Dispersed Liquid Agents.

January 1, 2001
Author(s)
Jiann C. Yang, Michelle K. Donnelly, N C. Prive, William L. Grosshandler
This paper is an abridged version of NISTIR 6319. The design, construction, demonstration, and operation of a bench-scale device capable of screening the fire suppression efficiency of liquid agents are described in detail in this report. The apparatus is

Apparatus for Screening Fire Suppression Efficiency of Dispersed Liquid Agents.

January 1, 2001
Author(s)
Jiann C. Yang, Michelle K. Donnelly, William L. Grosshandler, N C. Prive
This paper is an abridged version of NISTIR 6319. The design, construction, demonstration, and operation of a bench-scale device capable of screening the fire suppression efficiency of liquid agents are described in detail in this report. The apparatus is
Displaying 45726 - 45750 of 74178