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Displaying 30726 - 30750 of 73461

Shear Thinning Near the Critical Point of Xenon

April 17, 2008
Author(s)
Robert F. Berg, Michael R. Moldover, M Yao, G A. Zimmerli
We measured shear thinning, a viscosity decrease ordinarily associated with complex liquids, near the critical point of xenon. The data span the range of reduced shear rates: 0.001 < γτ < 700, where γτ is the shear rate scaled by the relaxation time τ of

Physical characterization methods for iron-oxide contrast agents encapsulated within a targeted liposome-based delivery system

April 16, 2008
Author(s)
John A. Dagata, Natalia Farkas, Cindi L. Dennis, Robert D. Shull, Vincent A. Hackley, Charles W. Yang, Kathleen F. Pirollo, Esther H. Chang
Intact liposome-based targeted nanoparticle delivery systems (NDS) are immobilized by nonselective binding and characterized by scanning probe microscopy (SPM) in a fluid imaging environment. The size, size distribution, functionality, and stability of an

An Evaluation of Description Logic for the Development of Product Models

April 15, 2008
Author(s)
Xenia Fiorentini, Sudarsan Rachuri, Mahesh Mani, Steven J. Fenves, Ram D. Sriram
The languages and logical formalisms developed by information scientists and logicians concentrate on the theory of languages and logical theorem proving. These languages, when used by domain experts to represent their domain of discourse, most often have

Self-Sealing Nanoporous Low-k Dielectric Patterns Created by Nanoimprint Lithography

April 15, 2008
Author(s)
Hyun Wook Ro, H Peng, Ken-ich Nihara, Hae-Jeong Lee, Eric K. Lin, Alamgir Karim, D Gidley, Hiropshi Jinai, Do Y. Yoon, Christopher L. Soles
In this letter we describe how highly porous nanostructures can be directly printed into a poly(methylsilsequioxane) (PMSQ)-based organosilicate film, with high pattern fidelity, and develop the measurement infrastructure to quantitatively evaluate the

A Taxonomy of Homeland Security Modeling, Simulation, and Analysis Applications

April 14, 2008
Author(s)
Charles R. McLean, Sanjay Jain, Yung-Tsun T. Lee
The effective use of modeling, simulation, and analysis (MSA) applications could greatly enhance our ability to carry out the homeland security mission. These applications can be used to evaluate vulnerabilities in the nation s critical infrastructure as

Distribution of time-energy entanglement over 100 km fiber using superconducting single-photon detectors

April 14, 2008
Author(s)
Qiang Zhang, Hiroki Takesue, Sae Woo Nam, Carston Langrock, Xiuping Xie, Burm Baek, Martin M. Fejer, Yoshihisa Yamamoto
In this letter, we report an experimental realization of distributing entangled photon pairs over 100 km of dispersion-shifted fiber. In the experiment, we used a periodically poled lithium niobate waveguide to generate the time-energy entanglement and

Residual Multiparticle Entropy Does Not Generally Change Sign Near Freezing

April 13, 2008
Author(s)
William P. Krekelberg, Vincent K. Shen, Jeffrey R. Errington, Thomas M. Truskett
The residual multiparticle entropy (RMPE) of two- and three-dimensional fluids changes sign near the freezing line, providing a quasi-universal one-phase rule for the location of the liquid-solid transition. We present new simulation results ford

A Study of Users with Visual Disabilities and a Fingerprint Process

April 10, 2008
Author(s)
Mary F. Theofanos, Brian C. Stanton, Charles L. Sheppard
The Department of Homeland Security¿s (DHS) United States Visitor and Immigrant Status Indicator Technology (US-VISIT) program is a biometrically-enhanced identification system primarily situated at border points of entry such as airports and seaports

Thermal Voltage Converter Calibrations Using a Quantum AC Standard

April 10, 2008
Author(s)
Thomas E. Lipe Jr., Joseph R. Kinard Jr., Yi-hua D. Tang, Samuel Benz, Charles J. Burroughs, Paul Dresselhaus
We report on the first-ever use of a quantum ac source to calibrate a thermal transfer standard as part of the NIST calibration service for such devices, with reductions in calibration uncertainty of as much as an order of magnitude over traditional ac-dc

Digital Forensics at the National Institute of Standards and Technology

April 9, 2008
Author(s)
James R. Lyle, Douglas R. White, Richard P. Ayers
There are three digital forensic science projects: National Software Reference Library (NSRL), Computer Forensic Tool Testing (CFTT), Computer Forensic Reference Data Sets (CFReDS) currently providing resources for the digital investigator underway at the

Direct Experimental Observation of the Goos Hanchen Shift

April 9, 2008
Author(s)
H G. Schwefel, W Kohler, Z Lu, Jingyun Fan, L Wang
We report a precise direct measurement of the Goos-Hanchen (GH) shift after one reflection off a dielectric interface coated with periodic metal stripes. The spacial displacement of the shift is determined by image analysis. A maximal absolute shift of 5

Multiscale Modeling of Lattice Defects in Si-Ge(001) Quantum Wells

April 9, 2008
Author(s)
B. Yang, Vinod Tewary
A computationally efficient hybrid Green¿s function (GF) technique is developed for multiscale modeling of lattice defects in a trilayer material system that links seamlessly the length scales from lattice (sub-nanometers) to continuum (bulk). The model

Need for and Metrological Approaches Towards Standardization of Fluorescence Measurements From the View of National Metrology Institutes

April 9, 2008
Author(s)
Paul C. DeRose, Lili Wang, Adolfas K. Gaigalas, Gary W. Kramer, Ute Resch-Genger, Ulrich Panne
The need for standardization in fluorescence measurements to improve quality assurance and to meet regulatory demands is addressed from the viewpoint of national metrological institutes (NMIs). Classes of fluorescence standards are defined, including

PERFORMANCE OF SEISMIC MOMENT RESISTING CONNECTIONS UNDER COLUMN REMOVAL SCENARIO

April 9, 2008
Author(s)
Fahim Sadek, Hai S. Lew, Joseph A. Main, John L. Gross
Beam-to-column moment connections in steel frame construction have been studied extensively for seismic applications. However, the behavior of such connections has not been studied under the monotonic loading conditions expected in progressive collapse

Spatial Interpolation Algorithm for Error Concealment

April 9, 2008
Author(s)
Hamid Gharavi, Shaoshuai Gao
In this paper, we propose a new spatial interpolation algorithm for Intra-Frame error concealment. The method aims at interpolating areas in the image, which have been affected by packet loss. We have proposed an edge detection technique to aid the

A z-component magneto-resistive sensor

April 8, 2008
Author(s)
Fabio C. da Silva, Sean Halloran, Lu Yuan, David P. Pappas
A thin-film sensor is described that measures the component of the magnetic field perpendicular to the plane of the substrate (also called the z-component field.) The sensors are fabricated on anisotropically etched, V-shaped groves on Si(100) substrates

Clustering Characteristics of Millimeter Wave Indoor Channels

April 8, 2008
Author(s)
Kamran Sayrafian, Behnam Neekzad, John Baras
Temporal-Angular channel sounding measurements of an indoor millimeter wave channel (60 GHz) is analyzed to determine whether ray arrivals at the receiver form clusters in the two-dimensional time-angle space. The channel behavior for directional antennas

Exciton Spectroscopy of Hexagonal BN Using Non-Resonant X-Ray Raman Scattering

April 8, 2008
Author(s)
Y Feng, J A. Soininen, A L. Ankudinov, J O. Cross, Gerald T. Seidler, A T. Macrander, J J. Rehr, Eric L. Shirley
We report non-resonant x-ray Raman scattering (XRS) measurements from hexagonal BN for transferred momentum from 2 Angstrom} -1 to 9 Angstrom} -1 along directions both in and out of the basal plane. A symmetry-based argument together with calculations of
Displaying 30726 - 30750 of 73461
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