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Displaying 5551 - 5575 of 7113

Structural Fire Response and Probable Collapse Sequence of World Trade Center Building 7, Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1-9) VOLUMES 1 and 2

November 20, 2008
Author(s)
Therese P. McAllister
This report provides technical documentation of how NIST reconstructed the effects of the events on September 11, 2001 on WTC 7. This includes how the fires that followed the impact of debris from the collapse of WTC 1 (the north tower) led to the collapse

Automated Monitoring of Thin Film Properties via Ultrasonics

October 16, 2008
Author(s)
Donald L. Hunston
Non-destructively monitoring of the properties in a thin film or layered material (coatings, adhesives, etc.) is a difficult challenge, and yet there are many instances where this would be useful: fabrication (curing or drying), environmental attack, aging

Making Biometric Systems Usable Let's Not Forget the User

December 31, 2007
Author(s)
Mary F. Theofanos, Brian C. Stanton
The use of physical identifiable characteristics (biometrics) in border and transportation security has increased since 9/11. Currently, the United States Visitor and Immigrant Status Indicator Technology (US-VISIT) program collects a right and left index

Parallel-Plate Rheometer Calibration Using Oil and Lattice Boltzmann Simulation

October 11, 2007
Author(s)
Chiara F. Ferraris, Nicos Martys, M R. Geiker, N V. Muzzatti
The flow in traditional rotational rheometers is well known and rheological parameters such as viscosity can be calculated relatively easily. On the other hand, when the fluid is a suspension that contains particles with a diameter up to 2 mm, these

Supplementary Backward Equations p(h,s) for the Critical and Supercritical Regions (Region 3), and Equations for the Two-Phase Region and Region Boundaries of the IAPWS Industrial Formulation 1997 for the Thermodynamic Properties of Water and Steam*

October 11, 2007
Author(s)
Allan H. Harvey, J S. Gallagher, H J. Kretzschmar, J R. Cooper, K Knobloch, Radim Mares, K Miyagawa, N Okita, Roland Span, I. Stocker, Wolfgang Wagner, I Weber
… While these calculations are not frequently required, the computing time can be significant. Therefore, the …

Modeling Polymer Melt Flow Using the Particle Finite Element Method

September 5, 2007
Author(s)
Kathryn M. Butler, E Onate, S R. Idelsohn, R Rossi
A new particle-based approach is applied to the modeling of experiments on the effects of the melt flow behavior of thermoplastics. The Particle Finite Element Method (PFEM) combines convection of particles by the flow field with a finite element solution

Optimal Ion Trapping Experiment

May 10, 2007
Author(s)
Kevin J. Coakley
In each run of an experiment, ions are confined in a trap for duration {\tau}. After the trapping stage, ions are purged and detected. The detector provides incomplete information because it goes dead after detecting the first trapped ion. There is a dead

Technology and Metrology of New Electronic Materials and Devices

January 1, 2007
Author(s)
Eric M. Vogel
Scaling of the complementary metal oxide semiconductor (CMOS) field effect transistor (FET) and its traditional materials has been the basis of the semiconductor industry for nearly 30 years. Traditional materials such as SiO2 gate dielectrics and

Analysis of Sensitivity of VCCTL Measurements to Various Input Quantities

August 9, 2006
Author(s)
Adriana Hornikova, Blaza Toman, Nien F. Zhang, Hung-Kung Liu, Robert C. Hagwood, Edward J. Garboczi, Jeffrey W. Bullard
Virtual measurements are the outputs of well-defined mathematical models based on theoretical principles and simulation algorithms. The VCCTL (Virtual Cement and Concrete Testing Laboratory) is a software system built by the Material and Construction

Trapped atomic ions and quantum information processing

July 16, 2006
Author(s)
David J. Wineland, Dietrich G. Leibfried, James C. Bergquist, Brad R. Blakestad, John J. Bollinger, Joseph W. Britton, J Chiaverini, Ryan Epstein, David Hume, Wayne M. Itano, John D. Jost, Emanuel H. Knill, Jeroen Koelemeij, C. Langer, R Ozeri, Rainer Reichle, Till P. Rosenband, Tobias Schaetz, Piet Schmidt, Signe Seidelin, Nobuyasu Shiga, Janus Wesenberg
… The basic requirements for quantum computing and quantum simulation (Single- and multi-qubit …

Supplementary Backward Equations for Pressure as a Function of Enthalpy and Entropy p(h,s) to the Industrial Formulation IAPWS-IF97 for Water and Steam

July 11, 2006
Author(s)
H J. Kretzschmar, J Cooper, A Dittmann, J Trubenbach, Th Willkommen, Daniel G. Friend, J S. Gallagher, Radim Mares, Kiyoshi Miyagawa, Wolfgang Wagner, K Knobloch, I. Stocker
In 2001, the International Association for the Properties of Water and Steam (IAPWS) adopted backward equations for pressure as a function of enthalpy and entropy p(h, s) as supplement to the IAPWS Industrial Formulation 1997 for the Termodynamic

Trajectory Generation for an On-Road Autonomous Vehicle

June 26, 2006
Author(s)
John A. Horst, Anthony J. Barbera
We describe an algorithm that generates a smooth trajectory (position, velocity, and acceleration) for a non-holonomic vehicle autonomously navigating within the constraints of lanes in a road. The technique models both vehicle paths and lane segments as

A Two-Dimensional Terahertz Imaging System Using Hot Electron Bolometer

May 10, 2006
Author(s)
Dazhen Gu, Eyal Gerecht, Fernando Rodriquez Morales, Sigfrid Yngvesson
We present first results with a two-dimensional(2D)scanning, terahertz passive heterodyne imaging system currently under development. The imager is based on a phonon-cooled quasi-optically coupled HEB mixer integrated with an InP MMIC IF low-noise

Manufacturing Interoperability

May 1, 2006
Author(s)
Steven R. Ray, Albert T. Jones
National Institute of Standards and Technology, Gaithersburg, MD 20899, USA ABSTRACT: As manufacturing and commerce become ever more global in nature, companies are increasingly dependent upon the efficient and effective exchange of information with their

Multiparameter Equations of State for Selected Siloxanes

April 25, 2006
Author(s)
P. Colonna, R. Nannan, A. Guardone, Eric Lemmon
The development of technical equations of state using the 12-parameter Span-Wagner functional form for four siloxanes is presented in two parts. The fluids under investigation include hexamethyldisiloxane (MM), tetradecamethylhexasiloxane (MD4M)

Protecting Sensitive Information Transmitted in Public Networks

April 21, 2006
Author(s)
Shirley M. Radack
This bulletin summarizes NIST SP 800-77, Guide to IPsec VPNs, which was issued by NIST to help network architects, network administrators, security staff, technical support staff, and computer security program managers who are responsible for the technical

Broadband Permittivity Measurements of High Dielectric Constant Films

March 1, 2006
Author(s)
Jan Obrzut, Nozaki R. AnopchenkoA
Our investigation concerns measuring broadband dielectric permittivity and loss tangent of thin film high dielectric constant (high-k) dielectric materials at microwave frequencies. The measurements are made in an APC-7 coaxial configuration where the test

Fragility of Glass-Forming Polymer Liquids

October 4, 2005
Author(s)
J Dudowicz, Karl Freed, Jack F. Douglas
Many fluids exhibiting complex molecular structure or interactions solidify by glass-formation rather than crystallization. This tendency is especially prevalent in polymeric and biological systems where glass-formation is normal rather than exceptional

Combinatorial Synthesis and Dissolution Testing of Polyanhydride Copolymers

August 28, 2005
Author(s)
Brandon M. Vogel, Naomi Eidelman, Surya Mallapragada, Balaji Narasimhan
A linearly varying compositional library of 100 different polyanhydride randomcopolymers was designed, fabricated, and characterized within a few hours. A subset of this library was chosen and a substrate was designed and fabricated to enable the synthesis
Displaying 5551 - 5575 of 7113
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