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Displaying 10426 - 10450 of 73755

Exposure Study on the Aging of PTFE and Ceramic Diffusers

February 6, 2019
Author(s)
Benjamin K. Tsai, Catherine C. Cooksey, David W. Allen, Christopher C. White, Walter E. Byrd, Deborah S. Jacobs
This paper describes efforts to quantify the effects of aging in the ultraviolet (UV) on polytetrafluoroethylene (PTFE) and ceramic samples. Long term UV aging may significantly alter the reflectance factor and cause an error in the calibration of

Factory Optima: A Web-based System for Composition and Analysis of Manufacturing Service Networks based on a Reusable Model Repository

February 6, 2019
Author(s)
Alexander Brodsky, Mohan Krishnamoorthy, Mohomad O. Nachawati, William Z. Bernstein, Daniel A. Menasce
This paper reports on the development of Factory Optima, a web-based system that allows manufacturing process engineers to compose, optimize and perform trade-off analysis of manufacturing and contract service networks based on a reusable repository of

Inline Laser Power Measurement by Photon Momentum

February 6, 2019
Author(s)
John H. Lehman, Paul A. Williams, Daniel W. Rahn, Kyle A. Rogers
We present a measurement scheme and instrumentation for quantifying laser power by means of photon momentum. The optical design is optimized such that the incoming laser beam is minimally perturbed and is available for other purposes along the incoming

Mid-infrared dual-comb spectroscopy of volatile organic compounds across long open-air paths

February 5, 2019
Author(s)
Gabriel Ycas, Fabrizio Giorgetta, Kevin Cossel, Eleanor M. Waxman, Esther Baumann, Nathan Newbury, Ian Coddington
Open-path measurements of atmospheric gas species in the air, including volatile organic compounds, are essential to quantify emissions from sources like oil and gas, forest fires, and industry. Here, we extend open-path dual-comb spectroscopy to probe the

Calculation of the impulse response and phase noise of a high-current photodetector using the drift-diffusion equations

February 4, 2019
Author(s)
Franklyn Quinlan, Seyed Ehsan Jamali Mahabadi, Shaokang Wang, Thomas F. Carruthers, Curtis R. Menyuk, Meredith N. Hutchinson, Jason D. McKinney, Keith J. Williams
We describe a procedure to calculate the impulse response and phase noise of high-current photodetectors using the drift-diffusion equations while avoiding computationally expensive Monte Carlo simulations. We apply this procedure to a modified uni

Field-Polarization Sensitivity in rf Atomic Magnetometers

February 4, 2019
Author(s)
Vladislav P. Gerginov
We demonstrate the sensitivity of an optically-pumped atomic RF magnetometer to the polarization state of the detected RF magnetic field, and measure 33 dB difference in amplitude sensitivity for opposite circular field polarizations. This sensitivity

Large Outdoor Fires and the Built Environment: Summary of Kick-Off Workshop

February 4, 2019
Author(s)
Samuel L. Manzello, Sara McAllister, Sayaka Suzuki, Raphaele Blanchi, Elsa Pastor, Ronchi Enrico
The kickoff workshop of the new permanent working group, sponsored by the International Association for Fire Safety Science (IAFSS), entitled Large Outdoor Fires and the Built Environment was held from 3:00 pm to 4:30 pm on Sunday October 21, 2018. The

Nano-kelvin DC and AC Meissner-TES Thermometry

February 4, 2019
Author(s)
Solomon I. Woods, Adriaan C. Carter, Timothy M. Jung, Dana R. Defibaugh
The Meissner-TES is a relatively new type of high resolution cryogenic thermometer based upon a transition edge sensor (TES) which employs the magnetic transition of a superconductor to measure temperature. We have improved the signal-to-noise for DC

Solidification of Ni-Re Peritectic Alloys

February 4, 2019
Author(s)
William J. Boettinger, Dale E. Newbury, Nicholas W. Ritchie, Maureen E. Williams, Ursula R. Kattner, Eric Lass, Kil-Won Moon, Michael B. Katz
Differential thermal analysis (DTA) and microstructural and microprobe measurements of DTA and as-cast Ni-Re alloys with compositions between 0.20 and 0.44 mass fraction Re provide information to resolve differences in previously published Ni-Re phase

Summary of Workshop on Global Overview of Large Outdoor Fire Standards

February 4, 2019
Author(s)
Samuel L. Manzello
Large outdoor fires have the potential to negatively impact the built environment. Wildland fires that spread into communities, known as wildland-urban interface (WUI) fires have become a global problem. Large urban fires, including those that have

A Layered Graphical Model for Cloud Forensic and Mission Impact Analysis

February 1, 2019
Author(s)
Changwei Liu, Anoop Singhal, Duminda Wijesekera
In this paper, we describe a layered graphical model to analyze the impact of cyber attacks on business processes and services. Our model has three layers: the upper layer models the business processes and their dependencies. The middle layer constructs

A status of temporal trends of persistent organic pollutants in Arctic biota

February 1, 2019
Author(s)
Frank Riget, Anders Bignert, Birgit Braune, Maria Dam, Rune Dietz, Marlene Evans, Norman Green, Helga Gunnlaugsdottir, Katrin S. Hoydal, John Kucklick, Robert Letcher, Derek Muir, Stacy Schuur, Christian Sonne, Stern Gary, Gregg Tomy, Katrin Vorkamp, Simon Wilson
More than 1000 time-series of persistent organic pollutants (POPs) in Arctic biota from marine and freshwater ecosystems some extending back to the beginning of 1980s were analyzed using a robust statistical method. The Arctic area encompassed extended

Coherent light brightens the frontier of quantum science and technology

February 1, 2019
Author(s)
Jun Ye, Margaret Murnane
The precise control of coherent light across a vast spectral span has enabled revolutionary progress in precision measurements and the quantum control of atomic, molecular, and condensed matter systems. The laser was invented about 60 years ago (1) — 30

Elliptic Curves Arising from Triangular Numbers

February 1, 2019
Author(s)
Abhishek Juyal, Shiv D. Kumar, Dustin Moody
We study the Legendre family of elliptic curves E_t : y^2 = x(x − 1)(x − ∆t), parametrized by triangular numbers ∆t = t(t + 1)/2. We prove that the rank of E_t over the function field Q(t) is 1, while the rank is 0 over Q(t). We also produce some infinite
Displaying 10426 - 10450 of 73755
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