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NIST Authors in Bold

Displaying 27051 - 27075 of 74220

Innovations in Maximum Likelihood Quantum State Tomography

October 9, 2009
Author(s)
Scott C. Glancy, Emanuel H. Knill, Thomas Gerrits, Tracy S. Clement, Brice R. Calkins, Adriana E. Lita, Aaron J. Miller, Alan L. Migdall, Sae Woo Nam, Richard P. Mirin
At NIST we are engaged in an experiment whose goal is to create superpositions of optical coherent states (such superpositions are sometimes called "Schroedinger cat" states). We use homodyne detection to measure the light, and we apply maximum likelihood

Results of an international photomask linewidth comparison of NIST and PTB

October 9, 2009
Author(s)
Bernd Bodermann, Detleff Bergmann, Egbert Buhr, Wolfgang Haebler-Grohne, Harald Bosse, James E. Potzick, Ronald G. Dixson, Richard Quintanilha, Michael T. Stocker, Andras Vladar, Ndubuisi George Orji
In preparation of the international Nano1 linewidth comparison on photomasks between 9 national metrology institutes, NIST and PTB have started a bilateral linewidth comparison in 2008, independent of and prior to the Nano1 comparison in order to test the

Volume Estimation of Molded Artifacts by B-Splines

October 9, 2009
Author(s)
David E. Gilsinn, Bruce R. Borchardt, Amelia Tebbe
The volumes of two industrially molded non-metallic artifacts were estimated using surface data obtained by a coordinate measuring machine. A tensor product of B-splines was used to model the probed data points on the surface and the Divergence Theorem was

Mathematical Metrology for Evaluating a 6DOF Visual Servoing System

October 8, 2009
Author(s)
Tommy Chang, Tsai H. Hong, Milli Shah, Roger D. Eastman
In this paper we develop the best homogeneous matrix trans- formation to fit two streams of dynamic six-degree-of-freedom (6DOF) data for evaluating perception systems using ground truth. In particular, we compare object position and orien- tation results

Quantifying the Performance of MT-Connect in a Distributed Manufacturing Environment

October 8, 2009
Author(s)
John L. Michaloski, Byeong Eon Lee, Frederick M. Proctor, Sid Venkatesh, Sidney Ly
In the CNC manufacturing world, the continuing pressure to reduce costs and improve time to market places a premium on smarter ways of manufacturing and intensifies the need to integrate feedback from the shop floor into the enterprise business systems

Quantitative Assessment of Robot-generated Maps

October 8, 2009
Author(s)
Christopher J. Scrapper Jr, Rajmohan Madhavan, Adam S. Jacoff, R Lakaemper, A Censi, Afzal A. Godil, Asim Wagan
Mobile robotic mapping is now considered to be a sufficiently mature field with demonstrated successes in various domains. While there has been much progress made in the development of computationally efficient and consistent mapping schemes, it is still

Viscoelastic Properties of Confined Polymer Films Measured via Thermal Wrinkling

October 8, 2009
Author(s)
Kirt A. Page, Edwin Chan, Se Hyuk Im, Derek L. Patton, Rui Huang, Christopher Stafford
We present a new measurement technique to quantify the viscoelastic properties of polymer thin films. This approach utilizes thermally-induced surface wrinkling to measure the rubbery modulus and shear viscosity of polymer thin films. Specifically, by

Draft Report on the Collapse of the Dallas Cowboys Indoor Practice Facility, May 2, 2009 (NIST IR 7636) ***DRAFT for Public Comments (for final version, see NIST IR 7661)***

October 6, 2009
Author(s)
John L. Gross, Joseph Main, Long Phan, Fahim H. Sadek, Stephen A. Cauffman, David P. Jorgensen
This report summarizes the National Institute of Standards and Technology (NIST) study of the collapse of the Dallas Cowboys indoor practice facility that occurred on the afternoon of May 2, 2009, during a severe thunderstorm. The indoor practice facility

Effect of RP-1 Compositional Variability on Thermophysical Properties

October 6, 2009
Author(s)
Marcia L. Huber, Eric W. Lemmon, Thomas J. Bruno
We compare experimental and predicted thermophysical properties of two samples of rocket propellant RP-1 obtained from different batches of RP-1 that exhibit compositional variations. One sample is atypical, due to a high olefin content. The effect of the

Ontology Formalisms: What is Appropriate for Different Applications?

October 6, 2009
Author(s)
Craig I. Schlenoff
Ontologies can take many forms. There are ontologies that are extremely formal (e.g., using first order logic), and there are ontologies that are much less formally defined (e.g., ontologies in the relational databases or dictionaries). Nonetheless, all of

Open Issues in Secure DNS Deployment

October 6, 2009
Author(s)
Ramaswamy Chandramouli, Scott W. Rose
This paper describes some practical administrative issues and challenges in the deployment of DNSSEC - an IETF specified suite of security measures for securing the Domain Name System (DNS). The issues covered include: (a) Choice of Cryptographic

A Combined Fit of Total Scattering and Extended X-ray Absorption Fine Structure Data for Local-Structure Determination in Crystalline Materials

October 5, 2009
Author(s)
Igor Levin, Victor L. Krayzman, Joseph C. Woicik, Terrell A. Vanderah, M. G. Tucker, Thomas Proffen
Reverse Monte Carlo (RMC) refinements of local structure using a simultaneous fit of x-ray/neutron total scattering and EXAFS data were developed to incorporate an explicit treatment of both single- and multiple-scattering contributions to EXAFS. The

Advanced Capacitance Metrology for Nanoelectronic Device Characterization

October 5, 2009
Author(s)
Curt A. Richter, Joseph J. Kopanski, Yicheng Wang, Muhammad Y. Afridi, Xiaoxiao Zhu, D. E. Ioannou, Qiliang Li, Chong Jiang
We designed and fabricated a test chip (consisting of an array of metal-oxide-semiconductor (MOS) capacitors and metal-insulator-metal (MIM) capacitors ranging from 0.3 fF to 1.2 pF) for use in evaluating the performance of new measurement approaches for

An experiment for the precision measurement of the radiative decay mode of the neutron

October 5, 2009
Author(s)
R Cooper, Christopher D. Bass, E Beise, H Breuer, Jim Byrne, T E. Chupp, Kevin Coakley, Maynard S. Dewey, B Fisher, Changbo Fu, Thomas R. Gentile, M. McGonagle, Hans Pieter Mumm, Jeffrey S. Nico, Alan Keith Thompson, F E. Wietfeldt
The neutron typically beta decays into a proton, electron, and antineutrino. In some decays, it can be accompanied by a high energy photon. We recently performed the rst observation of the radiative beta decay branch for the free neutron with photons of
Displaying 27051 - 27075 of 74220