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Displaying 36726 - 36750 of 73697

Optical Flatness Metrology for 300 mm Silicon Wafers

April 1, 2005
Author(s)
Ulf Griesmann, Quandou (. Wang, T D. Raymond
At the National Institute of Standards and Technology (NIST), we are developing two interferometric methods for measuring the thickness variation and flatness of free-standing and chucked silicon wafers with diameters up to 300mm. The eXtremely accurate

Performance Analysis of Exponential Backoff

April 1, 2005
Author(s)
B J. Kwak, N O. Song, Leonard E. Miller
We have implemented a quantum key distribution (QKD) system with polarization encoding at 850 nm over 1 km of optical fiber. The high-speed management of the bit-stream, generation of random numbers and processing of the sifting algorithm are all handled

Precision Measurements of AC Josephson Voltage Standard Operating Margins

April 1, 2005
Author(s)
Charles J. Burroughs, Samuel P. Benz, Paul D. Dresselhaus, Yonuk Chong
Recent advances in circuit design and fabrication of superconducting integrated circuits have enabled us to demonstrate an ac Josephson voltage standard (ACJVS) that generates both ac and dc waveforms up to 242mV peak voltage. Using a Fast Fourier

Progress on Johnson Noise Thermometry using a Quantum Voltage Noise Source for Calibration

April 1, 2005
Author(s)
Sae Woo Nam, Samuel P. Benz, Paul D. Dresselhaus, Charles J. Burroughs, Weston L. Tew, D. R. White, John M. Martinis
We describe our progress towards a high-precision measurement of temperature using Johnson noise. Using a Quantized Voltage Noise Source (QVNS) based on the Josephson effect as a calculable noise source, we have been able to measure the ratio of the

Project MESA Technical Specification Group document MESA_70.012_v1.2.1.doc

April 1, 2005
Author(s)
L T. Klein-berndt, Nader Moayeri
We have implemented a quantum key distribution (QKD) system with polarization encoding at 850 nm over 1 km of optical fiber. The high-speed management of the bit-stream, generation of random numbers and processing of the sifting algorithm are all handled

Real-time Applications for Sensor Networks

April 1, 2005
Author(s)
Hamid Gharavi
We have implemented a quantum key distribution (QKD) system with polarization encoding at 850 nm over 1 km of optical fiber. The high-speed management of the bit-stream, generation of random numbers and processing of the sifting algorithm are all handled

Redefinition of the Kilogram: A Decision Whose Time Has Come

April 1, 2005
Author(s)
I M. Mills, Peter Mohr, T J. Quinn, Barry Taylor, Edwin R. Williams
The kilogram, the base unit of mass in the International System of Units (SI), is defined as the mass m(K) of the international prototype of the kilogram. This definition has the effect of fixing the value of m(K) to be one kilogram exactly. In this paper

Refractometry Using a Helium Standard

April 1, 2005
Author(s)
Jack A. Stone Jr., Alois Stejskal
The refractive index of helium at atmospheric pressure can be calculated from first principles with a very low uncertainty, on the order of 10^-10. Furthermore, the low refractive index of helium puts minimal demands on the pressure and temperature

Scanning Electron Microscope Dimensional Metrology Using a Model-Based Library

April 1, 2005
Author(s)
John S. Villarrubia, Andras Vladar, Michael T. Postek
The semiconductor electronics industry places significant demands upon secondary electron imaging to obtain dimensional measurements that are used for process control or failure analysis. Tolerances for measurement uncertainty and repeatability are smaller

Software Assurance Metrics and Tool Evaluation (SAMATE)

April 1, 2005
Author(s)
Michael J. Kass
The National Software Reference Library (NSRL) of the U.S. National Institute of Standards and Technology (NIST) collects software from various sources and publishes file profiles computed from this software (such as MD5 and SHA-1 hashes) as a Reference

Stabilized frequency comb with a self-referenced femtosecond Cr:forsterite laser

April 1, 2005
Author(s)
Kyoungsik Kim, Brian R. Washburn, G Wilpers, Christopher W. Oates, Leo W. Hollberg, Nathan R. Newbury, Scott A. Diddams, Jeffrey W. Nicholson, M. F. Yan
A frequency comb is generated with a Cr:forsterite femtosecond laser, spectrally broadened through a highly nonlinear optical fiber to span from 1.0 υm to 2.2 υm, and stabilized using the f-to-2f self-referencing technique. The repetition rate and the

Strongly Inhibited Transport of a Degenerate 1D Bose Gas in a Lattice

April 1, 2005
Author(s)
C Fertig, K M. O'Hara, J H. Huckans, S L. Rolston, William D. Phillips, James V. Porto
We report the observation of strongly damped dipole oscillations of a quantum degenerate 1D atomic Bose gas in a combined harmonic and optical lattice potential. Damping is significant for very shallow axial lattices (0.25 photon recoil energies), and

The Fast Fourier Transform for Experimentalists, Part I: Concepts

April 1, 2005
Author(s)
D Donnelly, Bert W. Rust
The discrete Fourier transform (DFT) is a widely used tool for the analysis of measured time series data. The Cooley-Tukey fast Fourier transform (FFT) algorithm gives an extremely fast and efficient implementation of the DFT. This is the first of a series

The OATS Method Revisited

April 1, 2005
Author(s)
Christopher L. Holloway, Perry F. Wilson, Robert German
Open area test sites (OATS) or equivalent semi-anechoic chambers are the most commonly used sites for EMC emissions tests. This article discusses the origins of this test methodology and revisits the interference problem (broadcast media) that the OATS

The TREC Ad Hoc Experiments

April 1, 2005
Author(s)
Donna K. Harman
Ad hoc retrieval is the prototypical search engine task: searching a static set of documents with a previouslyunseen query. The ad hoc task was one of the first two tasks tackled in TREC and was run for eight years, representing hundreds of experiments

The TREC Test Collections

April 1, 2005
Author(s)
Donna K. Harman
The creation of a set of large, unbiased test collections has been critical to the success of TREC. This chapteris the documentation for the TREC collections. It reviews the motivation for building the collections, describes the methods used to create them
Displaying 36726 - 36750 of 73697
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