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Conferences

A coherent dual-comb spectrometer at 3.4 υm for accurate line center measurement of methane

October 10, 2011

Author(s)

Esther Baumann, Fabrizio R. Giorgetta, Ian R. Coddington, William C. Swann, Alexander M. Zolot, Nathan R. Newbury

Doppler-broadened methane lines around 3.4 υm are measured with a coherent dual-comb spectrometer with an absolute-frequency axis. The obtained accuracy of the...

Radiation, Multimode Propagation, and Substrate Modes in W-Band CPW Calibrations

October 10, 2011

Author(s)

Dylan F. Williams, Franz-Joseph Schmuckle, Ralf Dorner, G.N. Phung, Wolfgang Heinrich, Uwe Arz

We investigate the degradation of the accuracy of coplanar waveguide calibration standards at higher frequencies due to multi-mode propagation, substrate modes...

Dual-comb-based characterization of rapidly tuned lasers

October 10, 2011

Author(s)

Fabrizio R. Giorgetta, Esther Baumann, Ian R. Coddington, William C. Swann, Nathan R. Newbury, Zeb W. Barber, Peter Roos

We demonstrate a technique to calibrate the instantaneous frequency versus time from a rapidly tuned cw laser. Our dual-comb-based spectrometer can measure...

Multi-Relationship Evaluation Design: Formalizing Evaluation Design Input and Output Blueprint Elements for Testing Developing Intelligent Systems

October 5, 2011

Author(s)

Brian A. Weiss, Linda C. Schmidt

Intelligent technologies within the military, law enforcement, and homeland security fields are continuously evolving. Testing these technologies is crucial to...

Suppressant-enhanced overpressure in the FAA Aerosol Can Simulator: Thermodynamic Considerations

October 5, 2011

Author(s)

Gregory T. Linteris, Fumiaki Takahashi, Viswanath R. Katta, Harsha K. Chelliah, Oliver Meier

Metamodels towards Improved Domain Modeling for Semantic Inferencing

October 3, 2011

Author(s)

Paul W. Witherell, Anantha Narayanan Narayanan, Jae H. Lee, Sudarsan Rachuri

As information requirements have increased, domain models have become increasing complex and difficult to manage. Though domain-specific languages have been...

Secondary Pulse Tubes and Regenerators for Coupling to Room-Temperature Phase Shifters in Multistage Pulse Tube Cryocoolers

October 3, 2011

Author(s)

Ray Radebaugh, Agnes A. O'Gallagher, John M. Gary

Multistage pulse tube cryocoolers require separate phase shifters for each stage. For sufficiently high frequency and acoustic power, the inertance tube is...

DNA ENTROPOPHORESIS: A BALANCE OF ENTROPY AND DIFFUSION IN COMPLEX NANOCONFINEMENT

October 3, 2011

Author(s)

Samuel Stavis, Jon Geist, Michael Gaitan, Laurie E. Locascio, Elizabeth Strychalski

Entropophoresis - motion caused by an entropy gradient - is a novel nanofluidic method to direct the self-transport of biopolymers that established a new...

ON-CHIP PERVAPORATION-FREE CONTROL OF GAS PARTIAL PRESSURES

October 2, 2011

Author(s)

Peter C. Thomas, Laurie E. Locascio, Srinivasa R. Raghavan, Samuel Forry

Pre-equilibrated aqueous solutions were used on-chip to simultaneously mitigate pervaporation and modulate the partial pressures of oxygen (PO2) and carbon...

Carbon nanotube arrays for absolute IR and THz radiometry

October 2, 2011

Author(s)

John H. Lehman, Kerry N. Betz, Erich N. Grossman

We have assembled and evaluated a novel electrically calibrated thermopile having an array of 1.5 mm long multiwalled carbon nanotubes as the radiation absorber...

Microfluidic Transport and Sensing of Functionalized Superparamagnetic Beads with Integrated Spin-Valves

October 2, 2011

Author(s)

Wendy R. Altman, John M. Moreland, Stephen E. Russek, Victor M. Bright

This work describes a novel microfluidic platform to trap, release, transport, and detect superparamagnetic beads (SPBs) with magnetic spin-valves (SVs). This...

Measuring the Gy preventing convection in water calorimetry using a low duty cycle modulated beam

October 1, 2011

Author(s)

Huaiyu H. Chen-Mayer, Ronald E. Tosh

The most fundamental method for determining the absorbed dose to water by radiation beams is by measuring the consequent temperature increase of the water...

Strategies for Nanoscale Contour Metrology using Critical Dimension Atomic Force Microscopy

September 30, 2011

Author(s)

Ndubuisi G. Orji, Ronald G. Dixson, Andras Vladar, Michael T. Postek

Contour metrology is one of the techniques used to verify optical proximity correction (OPC) in lithography models. The use of these methods, which are known as...

Calibration and Deployment of a New NIST Transfer Radiometer for Broadband and Spectral Calibration of Space Chambers (MDXR)

September 30, 2011

Author(s)

Timothy M. Jung, Adriaan C. Carter, Solomon I. Woods, Simon G. Kaplan

The Low-Background Infrared (LBIR) facility at NIST has performed on-site calibration and initial off-site deployments of a new infrared transfer radiometer...

5754 Aluminum Sheet Deformed Along Bi-Linear Strain Paths

September 29, 2011

Author(s)

Mark A. Iadicola, Lin Hu, Anthony D. Rollett, Timothy J. Foecke

Sheet specimens of aluminum alloy 5754 were deformed along a series of bi-linear, equal-biaxial and uniaxial, strain paths while simultaneously measuring stress...

Service Life Prediction for Sealants

September 29, 2011

Author(s)

Christopher C. White, Donald L. Hunston, Kar T. Tan, James J. Filliben

Previous industry consensus postulated that four elements of the weather: Temperature, Humidity, Ultraviolet Radiation, and Mechanical loading were responsible...

A Mathematical Model of Joint Congestion Control and Routing in Multisource Networks

September 28, 2011

Author(s)

Fern Y. Hunt, Vladimir V. Marbukh, Yi Wang

In this paper we study a model of joint congestion control and routing in a ring of network sources with a single destination at the center. A utility...

Distributed Deployment Algorithms for Improved Coverage in Mobile Sensor Networks

September 28, 2011

Author(s)

Vladimir V. Marbukh, Kamran Sayrafian, Hamid Mahboubi, Kaveh Moezzi, Amir G. Aghdam

In this paper, various sensor deployment strategies are studied for effective coverage in wireless sensor networks. In the proposed algorithms, each sensor...

THz Spectroscopic Study of Iron Oxide Layers within Steel-Reinforced Structural Components

September 26, 2011

Author(s)

Virgil Provenzano, Shin G. Chou

In this study, we use THz-based spectroscopy as a non-destructive diagnostic tool to characterize the corrosion by-products (rust) on aged iron structural...

An Iterative Algorithm for Calculating Stylus Radius Unambiguously

September 24, 2011

Author(s)

Theodore V. Vorburger, Xiaoyu A. Zheng, Thomas B. Renegar, Jun-Feng Song, Li Ma

The stylus radius is an important specification for stylus instruments and is commonly provided by instrument manufacturers. However, it is difficult to measure...

An Experimental and Computational Study of Approach Air Distribution for a Finned-Tube Heat Exchanger

September 21, 2011

Author(s)

David A. Yashar

A Laser-Cooled Frequency Standard for GPS

September 20, 2011

Author(s)

Thomas P. Heavner, Stephan E. Barlow, Marc A. Weiss, Neil Ashby, Steven R. Jefferts

NIST is in an initial phase of developing a prototype laser-cooled atomic frequency standard (AFS) for potential use in a future GPS system. The expected...

Modeling of Bolted Connections for Collapse Analysis of Steel Structures

September 19, 2011

Author(s)

Joseph A. Main, Fahim Sadek

In structural collapse scenarios, beam to column connections can be subjected to large rotations as the structure deforms, in addition to large axial forces...

Fully lithographic fiber-coupled cryogenic radiometer for picowatt powers

September 19, 2011

Author(s)

Nathan A. Tomlin, John H. Lehman, Sae Woo Nam

A new type of absolute cryogenic radiometer has been fabricated at the microscale level for direct substitution optical fiber power measurements. It consists of...

International comparisons of optical fiber power measurements

September 19, 2011

Author(s)

Igor Vayshenker, David J. Livigni, Xiaoyu X. Li, John H. Lehman

We discuss the results of optical fiber power meter (OFPM) measurements at 1310 and 1550 nm made by NIST and seven national measurement institutes (NMIs). We...

Extending single-photon optimized superconducting transition edge sensors beyond the single-photon counting regime

September 19, 2011

Author(s)

Thomas Gerrits, Brice R. Calkins, Nathan A. Tomlin, Adriana E. Lita, Alan L. Migdall, Sae Woo Nam, Richard P. Mirin

Photon number resolving transition-edge sensors (TES) are the cutting-edge enabling technology for high quantum efficiency photon number counting. The TES...

Absolute high-power laser measurements with a flowing water power meter

September 18, 2011

Author(s)

Christopher L. Cromer, Xiaoyu X. Li, John H. Lehman, Marla L. Dowell

We describe a novel flowing water power meter (FWOPM) for high-power laser radiometry in the range of 50 W to 10 kW. The FWOPM has several design features; a...

Performance of Hybrid 4.5kV SiC JBS Freewheeling Diode and Si IGBT

September 16, 2011

Author(s)

Karl Hobart, Eugene Imhoff, F. J. Kub, Allen R. Hefner Jr., Tam H. Duong, Jose M. Ortiz, Sei-Hyung Ryu, David Grider, Scott G. Leslie, Jerry Sherbondy, B Ray

Testing Passive UHF Tag Performance Evolution

September 15, 2011

Author(s)

Daniel G. Kuester, David R. Novotny, Jeffrey R. Guerrieri, Zoya Popovic

Trends in tag development since the introduction of the ISO 18000-6C and EPC Global standards are investigated empirically with measurements of power harvesting...

MEASUREMENTS OF EFFECTIVE DIFFUSION COEFFICIENT OF HELIUM AND HYDROGEN THROUGH GYPSUM

September 14, 2011

Author(s)

Jiann Yang, William M. Pitts, Marco Fernandez, Kuldeep Prasad

An experimental apparatus, which was based on the ¿-scale garage previously used for studying helium release and dispersion in our laboratory, was used to...

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