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Displaying 39151 - 39175 of 73929

Fingerprint Image Quality

April 13, 2004
Author(s)
Elham Tabassi, Charles Wilson, Craig I. Watson
In this report, we propose a new definition of quality of fingerprint impressions and present detailed algorithms to measure image quality for fingerprints. We define fingerprint image quality as a predictor of matcher performance before a matcher

Performance Evaluation Facility for LADARs

April 12, 2004
Author(s)
Geraldine S. Cheok, William C. Stone
The use and scope of LADAR (laser detection and ranging) applications continues to expand as the technology matures. This growth is reflected in the National Institute of Standards and Technology s (NIST) experience with research into the applications of

Reliability Metrology for the Semiconductor Industry at NIST

April 10, 2004
Author(s)
Stephen Knight, John S. Suehle, Joaquin (. Martinez
The National Institute of Standards and Technology provides critical metrology development for the semiconductor manufacturing industry as it moves from the microelectronics era into the nanoelectronics era. This presentation will describe the National

Structure and Reaction in the Active Site of Mammalian Adenylyl Cyclase

April 8, 2004
Author(s)
Y. S. Lee, Morris Krauss
The reaction path for the catalytic conversion of adenosine triphosphate (ATP) to cyclic adenosine monophosphate (cAMP) by the enzyme mammalian adenylyl cyclase has been calculated theoretically using the Hartree-Fock method. The crystal structure of a

Photomask Critical Dimension Metrology in the Scanning Electron Microscope

April 7, 2004
Author(s)
Michael T. Postek
Critical Dimension (CD) control begins at the photomask. Therefore, photomask metrology is a principal enabler for the development and manufacture of current and future generations of semiconductor devices. With the potential of 100, 65 and 45 nanometer

Microfabricated alkali atom vapor cells

April 5, 2004
Author(s)
Li-Anne Liew, Svenja A. Knappe, John M. Moreland, Hugh Robinson, David C. Larbalestier, John Kitching
We describe the fabrication of chip-sized alkali atom vapor cells using silicon micromachining and anodic bonding technology. Such cells may find use in highly miniaturized atomic frequency references or magnetometers. The cells consist of cavities etched

2nd Annual PKI Research Workshop Proceedings

April 1, 2004
Author(s)
Carl M. Ellison, William Polk, Nelson Hastings, Sean W. Smith
NIST hosted the second annual Public Key Infrastructure (PKI) Research Workshop on April 28-29, 2003. The two-day event brought together PKI experts from academia, industry, and government to explore the remaining challenges in deploying public key

A Dielectric Slit Die for In-Line Monitoring of Polymer Compounding

April 1, 2004
Author(s)
Anthony J. Bur, S C. Roth, M M. McBrearty
The dielectric slit die is an instrument that is designed to measure electrical, rheological, ultrasonics, optical and other properties of a flowing liquid. In one application it is connected to the exit of an extrudder, pump or mixing machine that passes

A digitally programmable capacitance standard

April 1, 2004
Author(s)
Yicheng Wang, Lai H. Lee
We constructed a digitally programmable capacitance standard by modifying a commercial temperature-stabilized 100 pF capacitance standard which consists of 23 binary-weighted capacitor elements on a single fused-silica disk. The variable capacitor can be

An Architecture for Modeling and Simulation for Emergency Response

April 1, 2004
Author(s)
Sanjay Jain, Charles R. McLean
A number of modeling and simulation applications exist for studying individual aspects of emergency response scenarios. The value of these applications can be significantly increased if they can be used in an integrated manner to study all aspects of a

An EQMB Examination of Cu Surface Oxides in Borate Buffer

April 1, 2004
Author(s)
Ugo Bertocci
The oxidation and reduction of copper, either electrodeposited or vapor-deposited onto quartz crystal resonators, was examined in borate/boric acid mixtures at different pH's, comparing electrochemical measurements with mass changes. The results showed

An Optimized Design of Finned-Tube Evaporators Using the Learnable Evolution Model

April 1, 2004
Author(s)
Piotr A. Domanski, David A. Yashar, Kenneth Kaufman, RK S. Michalski
Optimizing the refrigerant circuitry for a finned-tube evaporator is a daunting task for traditional exhaustive search techniques due to the extremely large number of circuitry possibilities. For this reason, more intelligent search techniques are needed

Beam-Loss Spectroscopy of Cold Collisions in a Bright Sodium Beam

April 1, 2004
Author(s)
J Ramirez-Serrano, W DeGraffenreid, J Weiner, Eite Tiesinga, Paul S. Julienne
We report beam loss photoassociation (PA) spectra of cold collisions within a slow, bright Na atom beam near the D1 resonance line. The high collimation and brilliance of the atomic beam permits the detection of atomic fluorescence loss resulting from the

Beyond Geometry: Issues in Product Representation

April 1, 2004
Author(s)
Ram D. Sriram
Slides presented at the Innovative Design of Complex Aerospace Systems Workshop at held at the NASA Langley Research Center in Hampton, Virginia, on March 24, 2004.

Chaotic Scattering and Escape Times of Marginally Trapped Ultracold Neutrons

April 1, 2004
Author(s)
Kevin Coakley, J M. Doyle, S N. Dzhosyuk, L Yang, Paul R. Huffman
We compute classical trajectories of Ultracold neutrons (UCNs) in a superconducting Ioffe-type magnetic trap using a symplectic integration method. We find that the computed escape time for a particular set of initial conditions (momentum and position)

Characteristics of Fire Scenarios in Which Sublethal Effects of Smoke Are Important

April 1, 2004
Author(s)
Richard D. Peacock, Jason D. Averill, Paul A. Reneke, Walter W. Jones
A number of simulations were performed using the CFAST zone fire model to predict the relative times at which smoke inhalation and heat exposure would result in incapacitation. Fires in three building types were modeled: a ranch house, a hotel, and an

Comparative Specular X-Ray Reflectivity, Positron Annihilation Lifetime Spectroscopy, and Incoherent Neutron Scattering Measurements of the Dynamics in Thin Polycarbonate Films

April 1, 2004
Author(s)
Christopher L. Soles, Jack F. Douglas, Wen-Li Wu, H G. Peng, D W. Gidley
The manner in which the dynamics of a polymer are affected by thin film confinement is one of technological significance, impacting thin film applications such as lubricants, adhesives, and chemically amplified photoresists. In this manuscript we use

Comparing the Transient Response of a Resistive-Type Sensor With a Thin Film Thermocouple During the Post-Exposure Bake Process

April 1, 2004
Author(s)
Kenneth G. Kreider, D P. DeWitt, J B. Fowler, J E. Proctor, William A. Kimes, Dean C. Ripple, Benjamin K. Tsai
Recent studies on dynamic temperature profiling and lithographic performance modeling of the post-exposure bake (PEB) process have demonstrated that the rate of heating and cooling may have an important influence on resist lithographic response. Generally

Dental Composites Based on Hybrid and Surface-Modified Amorphous Calcium Phosphates

April 1, 2004
Author(s)
Drago Skrtic, Joseph M. Antonucci, E D. Eanes, Naomi Eidelman
The objectives of this study were to examine the feasibility of preparing hybrid and surface-modified amorphous calcium phosphates (ACP) as fillers for mineral-releasing dental composites and determine whether the mechanical strength of the composites
Displaying 39151 - 39175 of 73929
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