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Displaying 13676 - 13700 of 73929

Method to Improve Point-Based Registration by Restoring Rigid-Body Condition

June 26, 2017
Author(s)
Marek Franaszek, Geraldine S. Cheok
The purpose of rigid-body registration is to find a rotation and translation which transforms one coordinate frame to another. The procedure requires measurement of common points (fiducials) in both frames. Noise and possible bias in the acquired locations

SI traceable determination of arsenic species in kelp (Thallus laminariae)

June 26, 2017
Author(s)
Lee L. Yu, Rolf L. Zeisler, Rachel C. Stanoyevitch
Kelp is a dietary supplement that contains significant amount of arsenic. Accurate assessment of dietary safety of kelp requires the determination of the arsenic species therein. A procedure was developed to extract the hydrophilic fraction of arsenicals

Software for complete mode structure analysis of a light field

June 26, 2017
Author(s)
Ivan A. Burenkov, Sergey V. Polyakov
We present a software package aimed at simulating photon-number probability distributions of a range of naturally occurring classical and non-classical states of light. This software can generate arbitrary probability distributions based on the known mode

Concave silicon micromirrors for stable hemispherical optical microcavities

June 23, 2017
Author(s)
Yiliang Bao, Feng Zhou, Thomas W. LeBrun, Jason J. Gorman
A detailed study of the fabrication of silicon concave micromirrors for hemispherical microcavities is presented that includes fabrication yield, surface quality, surface roughness, cavity depth, radius of curvature, and the aspect ratio between the cavity

Interdiffusion in the Ni-Re System: Evaluation of Uncertainties

June 23, 2017
Author(s)
William J. Boettinger, Maureen E. Williams, Kil-Won Moon
Diffusion couple experiments between Ni and Re at 1200°C and 1350°C were performed. These experiments established the limits of the two-phase FCC + HCP region. No intermediate phase was observed at these temperatures. Composition dependent interdiffusion

Optomechanical Quantum Correlations at Room Temperature

June 23, 2017
Author(s)
Thomas P. Purdy, Karen E. Grutter, Kartik A. Srinivasan, Jacob M. Taylor
By shining laser light through a nanomechanical beam, we measure the beam’s thermally driven vibrations and perturb its motion with optical forces at a level dictated by the Heisenberg measurement-disturbance uncertainty relation. Such quantum effects are

A Hybrid Task Graph Scheduler for High Performance Image Processing Workflows

June 22, 2017
Author(s)
Timothy J. Blattner, Walid Keyrouz, Mary C. Brady, Shuvra S. Bhattacharyya, Milton Halem
Designing applications for scalability is key to improving their performance in hybrid and cluster computing. Scheduling code to utilize parallelism is difficult, particularly when dealing with data dependencies, memory management, data motion, and

An Introduction to Information Security

June 22, 2017
Author(s)
Michael Nieles, Kelley L. Dempsey, Victoria Y. Pillitteri
Organizations rely heavily on the use of information technology (IT) products and services to run their day-to-day activities. Ensuring the security of these products and services is of the utmost importance for the success of the organization. This

Application of the Advanced Distillation Curve Method to the Comparison of Diesel Fuel Oxygenates: 2,5,7,10-Tetraoxaundecane (TOU), 2,4,7,9-Tetraoxadecane (TOD), and Ethanol/Fatty Acid Methyl Ester (FAME) Mixtures

June 22, 2017
Author(s)
Jessica L. Burger, Tara M. Lovestead, Mark LaFollette, Thomas J. Bruno
Although they are amongst the most efficient engine types, compression-ignition engines have difficulties achieving acceptable particulate emission and NOx formation. Indeed, catalytic after-treatment of diesel exhaust has become common and current efforts

Digital Identity Guidelines

June 22, 2017
Author(s)
Paul A. Grassi, Michael E. Garcia, James L. Fenton
These guidelines provide technical requirements for federal agencies implementing digital identity services and are not intended to constrain the development or use of standards outside of this purpose. The guidelines cover identity proofing and

Digital Identity Guidelines: Authentication and Lifecycle Management

June 22, 2017
Author(s)
Paul A. Grassi, Elaine M. Newton, Ray A. Perlner, Andrew R. Regenscheid, William E. Burr, Justin P. Richer, Naomi B. Lefkovitz, Jamie M. Danker, Yee-Yin Choong, Kristen Greene, Mary F. Theofanos
These guidelines provide technical requirements for federal agencies implementing digital identity services and are not intended to constrain the development or use of standards outside of this purpose. These guidelines focus on the authentication of

Digital Identity Guidelines: Enrollment and Identity Proofing Requirements

June 22, 2017
Author(s)
Paul A. Grassi, James L. Fenton, Naomi B. Lefkovitz, Jamie M. Danker, Yee-Yin Choong, Kristen Greene, Mary F. Theofanos
These guidelines provide technical requirements for federal agencies implementing digital identity services and are not intended to constrain the development or use of standards outside of this purpose. This guideline focuses on the enrollment and

Digital Identity Guidelines: Federation and Assertions

June 22, 2017
Author(s)
Paul A. Grassi, Ellen M. Nadeau, Justin P. Richer, Sarah K. Squire, James L. Fenton, Naomi Lefkovitz, Jamie M. Danker, Yee-Yin Choong, Kristen K. Greene
This document and its companion documents, SP 800-63, SP 800-63A, and SP 800-63B, provide technical and procedural guidelines to agencies for the implementation of federated identity systems and for assertions used by federations. This publication

In Vitro Cytochrome P450 46A1 (CYP46A1) Activation by Neuroactive Compounds

June 22, 2017
Author(s)
Natalia Mast, Kyle Anderson, Kevin Johnson, Thanh Phan, F. Peter Guengerich, Irina A. Pikuleva
Cytochrome P450 46A1 (CYP46A1 or cholesterol 24-hydroxylase) is the central nervous system-specific enzyme responsible for the majority of cholesterol elimination from the brain. Previously we found that CYP46A1 could be activated pharmacologically in mice

Towards Actionable Mission Impact Assessment in the Context of Cloud Computing

June 22, 2017
Author(s)
Xiaoyan Sun, Anoop Singhal, Peng Liu
Today's cyber-attacks towards enterprise networks often undermine and even fail the mission assurance of victim networks. Mission cyber resilience (or active cyber defense) is critical to prevent or minimize negative consequences towards missions. Without

A Near Optimal Algorithm to Count Occurrences of Subsequences of a Given Length

June 21, 2017
Author(s)
Jose Torres-Jimenez, Idelfonso Izquierdo-Marquez, Daniel Ramirez-Acuna, Rene Peralta
For a positive integer k let S = 0, 1, . . . , k − 1} be the alphabet whose symbols are the integers from 0 to k − 1. The set off all strings of length n ∈ Z+ over S is denoted by S(n). We show a near optimal algorithm to solve the problem of counting the

Approaches for Characterizing Nonlinear Mixtures in Hyperspectral Imagery

June 21, 2017
Author(s)
Robert S. Rand, Ronald G. Resmini, David W. Allen
This study considers a physics-based and a kernel-based approach for characterizing pixels in a scene that may be linear (areal mixed) or nonlinear (intimately mixed). The physics-based method is based on earlier studies that indicate nonlinear mixtures in
Displaying 13676 - 13700 of 73929
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