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Displaying 42726 - 42750 of 73829

Ultrafast Photodissociation of Br 2 : Laser-Generated High-Harmonic Soft X-Ray Probing of the Transient Photoelectron Spectra and Ionization Cross Sections

October 1, 2002
Author(s)
L Nugent-Glandorf, M Scheer, D A. Samuels, V M. Bierbaum, S R. Leone
The ultrafast dissociation of gas-phase Br 2 is probed via a 400 nm-pump soft-x-ray probe scheme at five different high-order harmonicwavelengths (13th, 15th, 17th, 19th, and 21st of an 800 mn Ti:sapphire laser). A series of time-resolved ultrafast

Using HMMs to Quantify Signals from DNA Driven Through a Nanometer Scale Pore

October 1, 2002
Author(s)
Vincent M. Stanford, John J. Kasianowicz
It was recently shown that individual molecules of single-stranded DNA can be forced through a nanoscale pore by an electric field. We demonstrate signal processing methods to detect and measure sub-states in the DNA-induced current blockades during

Three Dimensional Data Capture in Indoor Environments for Autonomous Navigation

September 30, 2002
Author(s)
John Evans, Tommy Chang, Tsai Hong Hong, Roger V. Bostelman, Robert Bunch
An innovative use of a low-cost laser range scanner captures three dimensional features of indoor environments in a manner suitable for mobile robot navigation that is superior to earlier approaches. This three dimensional mapping solves many of the known

A Tool to Improve Efficiency in Large Scale Manufacturing

September 25, 2002
Author(s)
Roger V. Bostelman, William P. Shackleford, Frederick M. Proctor, James S. Albus, Alan M. Lytle
NIST is working directly with industry to improve repair and conversion operations of ships in dry dock. Similarly, this work allows transfer of technology to construction and other industries requiring worker-access to large, external surfaces with

Advancements in Tele-Robotic Pipelaying

September 23, 2002
Author(s)
L E. Bernold, B Li
The labor intensive construction industry has a very high accident rate. One of the key reasons for this is the exposure of workers to a hazardous environment such as heights, confined narrow spaces, and exposure to health threatening fumes, dust, and

Bimodal Size Distribution of Self-Assembled InGaAs Quantum Dots

September 23, 2002
Author(s)
Solveig Anders, C. S. Kim, Benjamin D. Klein, Mark W. Keller, Richard Mirin
We investigate energy level quantization in self-assembled InGaAs quantum dots that are embedded In a GaAs matrix. We use capacitance and photoluminescence spectroscopy to analyze the evolution of the energy levels with varying amounts of deposited InGaAs
Displaying 42726 - 42750 of 73829
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