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Displaying 4426 - 4450 of 7112

Scalable arrays of doped silicon RF Paul traps

October 26, 2009
Author(s)
Joseph W. Britton, Dietrich G. Leibfried, James A. Beall, Brad R. Blakestad, Janus H. Wesenberg, David J. Wineland
We report techniques for the fabrication of multi-zone linear RF Paul traps which exploit the machinability and electrical conductivity of bulk doped silicon. The approach was verified by trapping and Doppler cooling 24Mg+ ions in two trap geometries: a

Future of Fire Simulation

December 1, 2002
Author(s)
Kevin B. McGrattan, Howard R. Baum, Ronald G. Rehm, Glenn P. Forney, Kuldeep R. Prasad
Scientists and engineers are often asked to make predictions of the state of technology in the future and are usually laughably wrong. The best prognosticators get the trends right, but cannot possibly fill in the details. Think of Jules Verne predicting a

Future of Fire Investigation

October 1, 2000
Author(s)
Daniel M. Madrzykowski
As the legal climate for arson and fire investigations becomes more demanding, their need for a rigorous scientific foundation is growing. Fortunately, federal research efforts are already starting to close the gap.

Supporting Relationships in Access Control Using Role Based Access Control

October 29, 1999
Author(s)
John Barkley, Konstantin Benznosov, Jinny Uppal
The Role Based Access Control (RBAC) model and mechanism have proven to be useful and effective. This is clear from the many RBAC implementations in commercial products. However, there are many common examples where access decisions must include other

Summary of the Structural Performance of Single-Family, Wood-Frame Housing

September 1, 1998
Author(s)
Charles W. Yancey, Geraldine Cheok, Fahim H. Sadek, B Mohraz
A review of the structural performance of single-family, wood-frame houses is presented. The performance of these structures in selected earthquakes and hurricanes is summarized. In general, wood-frame houses performed well with relatively few instances of

Brand Lofting Above Large-Scale Fires.

August 3, 1997
Author(s)
J P. Woycheese, P J. Pagni, D Liepmann
Although lofting of burning brands in forest fires has received considerable attention, little research has quantified the transport of brands from burning structures. This mechanism of fire spread is of particular importance in post-earthquake and urban

Pairwise Alignment of Chromatograms using a Fisher-Rao Metric

September 2, 2014
Author(s)
William E. Wallace, Anuj Srivastava, Kelly H. Telu, Yamil Simon
A new approach to aligning chromatograms is introduced and applied to examples of metabolite identification by liquid chromatography mass spectrometry (LC MS). A square root representation of the chromatogram’s derivative coupled with a Fisher Rao

A Profile of the Key Management Framework for the Federal Government

January 9, 2014
Author(s)
Elaine B. Barker
The Computer Security Division within ITL has recently provided a draft of Special Publication (SP) 800-152, A Profile for U. S. Federal Cryptographic Key Management Systems, for public comment. NIST SP 800-152 is based on NIST SP 800-130, A Framework for

Semiconductor-based detectors

December 13, 2013
Author(s)
Sergio Cova, Massimo Ghioni, Mark A. Itzler, Joshua Bienfang, Alessandro Restelli
… spectroscopy in life and material sciences, quantum computing and cryptography, profiling of remote objects with …

Re-projection of Terabyte-Sized Images

October 7, 2013
Author(s)
Peter Bajcsy, Antoine Vandecreme, Mary C. Brady
This work addresses the problem of re-projecting a terabyte-sized 3D data set represented as a set of 2D Deep Zoom pyramids. In general, a re-projection for small 3D data sets is executed directly in RAM. However, RAM becomes a limiting factor for terabyte

Method for Measuring Axis Orthogonality in MEMS Accelerometers

July 15, 2013
Author(s)
Craig D. McGray, Muhammad Y. Afridi, Jon C. Geist
A method is described for the computation of axis orthogonality errors in 3-axis accelerometers, based on the application of gravitational force at known angles. A precision two-axis articulated gimbal system is used to control the angle at which the

Use of Electronic Calibration Units for Vector-Network-Analyzer Verification

July 30, 2010
Author(s)
Dylan F. Williams, Arkadiusz C. Lewandowski, Denis X. LeGolvan, Ronald A. Ginley, Chih-Ming Wang, Jolene D. Splett
We present measurements indicating that electronic calibration units are stable enough to be used in place of mechanical vector-network-analyzer verification artifacts. This enables a new fully automated approach to verifying microwave vector-network

Real Time Data Acquisition Platform for Pulsed Measurements

June 14, 2010
Author(s)
Sergey V. Polyakov, Alan L. Migdall, Sae Woo Nam
We present an inexpensive and simple data acquisition platform based on Field Programmable Gate Arrays (FPGAs) designed to acquire and characterize fast digital or analog electrical signal real time for processing on a generic personal computer. While the

Development of Surgical Lighting for Enhanced Color Contrast

May 14, 2007
Author(s)
Maritoni A. Litorja, Steven W. Brown, Maria E. Nadal, David W. Allen, Alexander Gorbach
The National Institute of Standards and Technology and the National Institutes of Health have started a collaborative study on the development of lighting that will provide enhanced, specific to various tissues, contrast with respect to its surroundings

Simulations of Noise-Parameter Uncertainties

June 7, 2002
Author(s)
James P. Randa
This paper reports results for uncertainties obtained using a Monte Carlo simulation of noise-parameter measurements. The simulator permits the computation of the dependence of the uncertainty in the noise parameters on uncertainties in the underlying
Displaying 4426 - 4450 of 7112
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