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Displaying 30501 - 30525 of 74242

Relativistic Connection of Discrete- and Continuous-Time Quantum Walks

October 16, 2008
Author(s)
Frederick Strauch
Quantum walks have deep connections to quantum search algorithms, quantum cellular automata, quantum chaotic maps, and quantum state transfer. One of the earliest connections, due to Feynman, is to the Dirac equation. The mathematical details of this

Relativistic Quantum Walks

October 16, 2008
Author(s)
Frederick Strauch
By pursuing the deep relation between the one-dimensional Dirac equation and quantum walks, the physical role of quantum interference in the latter is explained. It is shown that the time evolution of the probability density of a quantum walker, initially

Reliable Control of Josephson Phase Qubits

October 16, 2008
Author(s)
M Steffen, J M. Martinis, Isaac C. Chuang
A quantum bit is a closed two-dimensional Hilbert space, but often experimental systems have three or more energy levels. In a Josephson phase qubit the energy difference between successive levels differ by only a few percent, and hence care must be taken

Reliable Materials Data - The Whys and Wherefores of Data Evaluation

October 16, 2008
Author(s)
J R. Rumble, C P. Sturrock
The tangible products of our world are made from materials; some resulting from natural forces, others from manufacturing. Regardless of the source, the performance we expect from a product depends critically on the materials in that product. For

Remarks on Irreversible Processes and Entropy Increase

October 16, 2008
Author(s)
B Robertson
Thermodynamics defines entropy only at equilibrium and says that, for an isolated system that undergoes an irreversible process, the entropy is increased. It is silent about whether entropy increases monotonically during the irreversible process. Thus it

Repeatable Group Models for Molecular Associations in Dental Collagen

October 16, 2008
Author(s)
Rafael L. Bowen
Type I collagen fibrils are essential components of teeth, bones, and other anatomical structures. A clear understanding of fibril characteristics could be of help in the design of adhesion-promoting compounds for demineralized dentin surfaces. Knowledge

Reply to editor of Flow Control Magazine

October 16, 2008
Author(s)
G E. Mattingly
In the article titled Flow Calibration Laboratory Performance: What Should Your Expectations Be? (Mar/Apr 2001), authors Bowles and Grimley state several times that No national or international standards exist for flow rate (p 25 and 29). I respectfully

Report From NIST to The Medical Devices Standards Board, July 15, 2004

October 16, 2008
Author(s)
John A. Tesk
Polymers Division Activities of interest to the Medical Devices Standards Board are summarized: The status of ASTM Task Force F04.42.06, Development of Reference Scaffolds for Tissue Engineering and the availability if the report on the NIBIB, NIST and FDA

Report of the Workshop: Nanometrology of Materials

October 16, 2008
Author(s)
P M. McGuiggan, Sheldon M. Wiederhorn
Probe microscopy is a class of techniques used worldwide to characterize properties and structures of materials. The techniques are especially good for examining materials locally for a wide range of material properties, including surface topology, surface

Report on the Key Comparison CCM.P-K4 in Absolute Pressure From 1 Pa to 1000 Pa

October 16, 2008
Author(s)
A P. Miiller, M Bergoglio, N Bignell, Kitty Fen, S S. Hong, Karl Jousten, Pardeep Mohan, R J. Redgrave, M Sardi, D Simpson
This report decribes a CCM key comparison of low absolute-pressure standards at seven National Measurement Institutes (NMIs) that was carried out during the period March 1998 to September 1999 in order to determine their degrees of equivalence at pressures

Report to The Medical Devices Standards Board

October 16, 2008
Author(s)
John A. Tesk
News of recent NIST standards-related activities are presented for information to the Medical Devices Standards Board. These include the release of reference material 8457 for measurements of crosslinking of Ultra High Molecular Weight Polyethylene (UHMWPE

Research for Improved Dental Restorative Materials

October 16, 2008
Author(s)
Francis W. Wang, Joseph M. Antonucci, J W. Stansbury
In Part A of this report, the interfacial bonding between resin and filler in dental composites is probed by use of the microdrop bead test in a single fiber model study. The microbond test has been shown to be a useful method for comparing silane treated

Research on the Mechanisms of Anaerobic Corrosion

October 16, 2008
Author(s)
W Iverson
Investigations of anaerobic corrosion of iron over the past years have led to a number of conclusions regarding the mechanisms. In addition several unusual observations related to these corrosion studies were noted. The cathodic depolarization mechanism

Resummation in the Doubly-Cut Borel Plane: The LoSurdo-Stark Effect

October 16, 2008
Author(s)
U Jentschura
The divergent perturbation series for the LoSurdo--Stark effect has purely real coefficients. By contrast, the energy eigenvalue of the quasistationary states is complex (the imaginary part corresponds to the autoionization width). Two different

Review of a Workshop on Thin Film Thermal Conductivity Measurements

October 16, 2008
Author(s)
A Feldman, N M. Balzaretti, A Guenther
A Workshop was held on the subject Thin Film Thermal Conductivity Measurement as part of the Thirteenth Symposium on Thermophysical Properties at the University of Colorado in Boulder, CO, June 25 and 26, 1997. The purpose of this Workshop was to provide a

Rhodopsin Chemistry and Structure

October 16, 2008
Author(s)
K D. Ridge
Rhodopsin is a retinal photoreceptor protein of bipartite structure consisting of the transmembrane protein opsin and the light Sensitive chromophore 11-cis-retinal, linked to opsin via a protonated Schiff base. Studies on rhodopsin have unveiled many

Robust Estimation of Effect Sizes Using Influence Functions

October 16, 2008
Author(s)
James H. Yen
The estimation of effect sizes is crucial part of meta-analysis. This papers uses influence functions as a fundamental tool in the analysis of estimates of effect size. The generalization to several variables of the influence function provides heuristic
Displaying 30501 - 30525 of 74242
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