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Displaying 31601 - 31625 of 74135

Quantum key distribution at GHz transmission rates

February 11, 2008
Author(s)
Alessandro Restelli, Joshua C. Bienfang, Alan Mink, Charles W. Clark
Quantum key distribution (QKD) channels are typically realized by transmitting and detecting single photons, and therefore suffer from dramatic reductions in throughput due to both channel loss and noise. These shortcomings can be mitigated by applying

Information management for Environmental Concerns

February 8, 2008
Author(s)
Eric D. Simmon, John V. Messina, Kevin G. Brady
Around the world there is a growing awareness that the environmental impact from manufacturing needs to be minimized. Concerns about issues from toxic materials ending up in landfills to manufacturing process chelmicals causing health problems are causing

The Potentials of Helium Ion Microscopy for Semiconductor Process Metrology

February 6, 2008
Author(s)
Michael T. Postek, Andras Vladar
Semiconductor manufacturing is always looking for more effective ways to monitor and control the manufacturing process. Helium Ion Microscopy (HIM) presents a new approach to process monitoring which has several potential advantages over the traditional

Effects of Contact Geometry Upon Pull-Off Force Measurements With a Colloidal Probe

February 5, 2008
Author(s)
Seung Ho Yang, Huan Zhang, Michael Nosonovsky, Koo-Hyun Chung
This paper examines the effects of contact geometry on the pull-off (adhesion) force between a glass sphere (colloidal probe) and a silicon substrate in an environment with controlled relative humidity. An atomic force microscope (AFM) is used to measure

Mixing in Microfluidic Devices Using Oscillatory Channel Flow

February 5, 2008
Author(s)
Frederick R. Phelan Jr., N R. Hughes, Jai A. Pathak
Mixing in microfluidic devices driven by oscillatory channel flow is studied. Numerical simulation of the unsteady Navier-Stokes equations is used to investigate generation of flow controlled chaotic mixing, in which the channel geometries have stationary

Self-Assembled Monolayers of an Oligo(ethylene oxide) Disulfide and its Corresponding Thiol Assembled From Water: Characterization and Protein Resistance

February 5, 2008
Author(s)
David J. Vanderah, Marlon L. Walker, Mark A. Rocco, Kenneth A. Rubinson
The self-assembled monolayers (SAMs) of the ?-methyl oligo(ethylene oxide) disulfide [S(CH2CH2O)6CH3]2, [S(EO)6]2 {OEO disulfide}, on Au from 95 % ethanol and from water are described. Spectroscopic ellipsometry and reflection-absorption infrared

TRC Thermodynamic Tables, Non-Hydrocarbon Supplement NH98, 2007

February 4, 2008
Author(s)
Michael D. Frenkel
1. Table 23-2-1-(1.15010)-db - Page db-5842.0 New table for 2-propenyl methanoate containing the density for the real fluid at selected temperatures and pressures. 2. Table 23-2-1-(1.21164)-db - Pages db-6033.0 through db-6033.3 New table for diethyl ether

Pseudo-Fermionization of 1-D Bosons in Optical Lattices

February 2, 2008
Author(s)
G Pupillo, A M. Rey, Carl J. Williams, Charles W. Clark
We present a model that generalizes the Bose-Fermi mapping for strongly correlated 1D bosons in an optical lattice, to cases in which the average number of atoms per site is larger than one. This model gives an accurate account of equilibrium properties of

Assessment of a Medium-Scale Polyurethane Foam Flammability Test.

February 1, 2008
Author(s)
Thomas J. Ohlemiller, John R. Shields
Six polyurethane foams of widely varying flame retardant levels have been tested in two modes: as four, fabric-wrapped cushions in a chair mock-up based on California Technical Bulletin 133 and in a two foam slab Vee configuration that uses multiple

Comb-Generator Characterization

February 1, 2008
Author(s)
Howard C. Reader, Dylan Williams, Paul D. Hale, Tracy S. Clement
We characterize a 50 GHz comb generator measured on a sampling oscilloscope. With careful control of the input power, input harmonics and comb generator temperature, we find the output spectrum to be stable to 0.1 dB and 0.5 degrees. We correct results for

Condensadores de Tubo con Aletas Optimizacion Mediante Sistema Inteligente

February 1, 2008
Author(s)
Piotr A. Domanski, David A. Yashar
The refrigerant circuitry influences a heat exchanger's attainable capacity. Typically, a design engineer specifies a circuitry and validates it using a simulation model or laboratory test. The circuitry optimization process can be improved by using

Diffusion Confusion

February 1, 2008
Author(s)
Edward F. Kelley
We discuss the true definitions of specular and diffuse reflection. Many people think that diffuse reflection is Lambertian reflection. Such is not the case. Lambertian is a special type of diffuse reflection, and the often-used equations for Lambertian

Recent Advances in Fire-Structure Analysis

February 1, 2008
Author(s)
Dat Duthinh, Kevin B. McGrattan, Abed M. Khaskia
One of the recommendations of the National Construction Safety Team for the Federal Building and Fire Safety Investigation of the World Trade Center Disaster (NIST NCSTAR 1, 2005) is to enhance the capability of available computational software to predict

The Accuracy and Stability of Quartz Watches

February 1, 2008
Author(s)
Michael A. Lombardi
A short review article about quartz wristwatches that presents measurements of their accuracy and stability. Measurements of both the stepping motors and crystal oscillators inside four quartz watches are made over a 30-day interval, and the results are

Design and Validation of a Whegs Robot in USARSim

January 31, 2008
Author(s)
B K. Taylor, Stephen B. Balakirsky, Elena R. Messina, R D. Quinn
Simulation of robots and other vehicles in a virtual domain has multiple benefits. End users can use the simulation as a training tool to increase their familiarity and skill with the vehicle without risking damage to the robot, potential bystanders, or
Displaying 31601 - 31625 of 74135
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