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Displaying 28826 - 28850 of 74129
Christopher G. Soares, S Vynckier, H Jarvinen, W G. Cross, J Hokkanen, P Sipila, D Fluhs, B Schaeken, F A. Mourtada, G A. Bass, T T. Williams
An international intercomparison of the dosimetry of three beta particle emitting ophthalmic applicators was performed, which involved measurements with radiochromic film, thermoluminescence dosimeters (TLDs), alanine pellets, plastic scintillators, an
Radioanalytical performance testing programs provide radioassay laboratories, regulators and the public performance-based evidence that measurement capabilities are in control. Performance acceptance criteria that combine aspects of measurements difference
A method for measuring the dynamic hardness of materials using a dropped ball is developed and applied to nonporous cold-rolled plain carbon (1018) steel. A new feature of the method is that it corrects the hardness measurement for the effects of pile-ups
The modeling or simulation of machining processes is important for economically implementing new manufacturing processes such as high-speed milling or ultraprecision machining. Knowing if a process will provide the required output prior to investing in
S C. Glotzer, N Jan, T Lookman, A B. MacIsaac, P H. Poole
We investigate the relationship between bulk and local relaxation in the Ising spin glass (in 2 and 3 dimensions) for temperatures above but approaching the glass transition temperature, using Monte Carlo computer simulations. We find that the stretched
S C. Glotzer, N Jan, T Lookman, A B. MacIsaac, P H. Poole
We investigate the relationship between bulk and local relaxation in the Ising spin glass (in 2 and 3 dimensions) for temperatures above but approaching the glass transition temperature, using Monte Carlo computer simulations. We find that the stretched
Single stranded DNA is modeled as a flexible polymer. The motion of such DNA in a vessel partitioned by a membrane containing a cylindrical nanopore is modeled. Statistical quantities such as the probability that a polymer end is at the pore entrance at
A discussion of current and proposed eBook standards and their applications. The discussions include: Open eBook Publication Structure (OEBPS), Portable Document Format (PDF), Open eBook File Format (OEBFF), Electronic Book Exchange System (EBX)
This paper describes modeling of the micromagnetic behavior near edges of ferromagentic thin films when uniform fields are applied in plane and perpendicular to the edge.
Objectives: In the edge chipping test, an increasing load is applied near the edge of a material until a chip is formed. Higher loads are required to form chips at greater distances from the specimen edge. The chip loads are plotted against the edge
Current edge-chip material testing procedures involve applying an increasing perpendicular force near a specimen edge until a chip forms. In this report, the effects of applied forces that are not perpendicular are studied, including quantitative changes
This study examined whether fluoride in a resin-based Ca-PO4 cements (RCPC) or a barrier of a bonding agent could compromise the remineralization potential of the cement. Cements were formulated with a fluoride additive (RCPC) or without fluoride (RCPC-NF)
Al interconnect lines, 2.6 υm wide, 0.5 υm thick, and 300 υm long, were synthesized with modified metal/passivation interfaces. The interface modifications are discontinuous along the length of the line, enabling comparison of void formation in modified
Quantification of signal-processing effects is required for an accurate determination (less than 1% uncertainty) of the absolute phase velocity, particularly when Fouier techniques are used. The velocity is calculated by using the travel time determined
Molecular dynamics modeling of C-C bond dissociation is performed for a series of linear alkanes and polyethylene macromolecules with the chain lengths ranging from one to a thousand of constituent ethylene monomers (PE-1 - PE-1000). The rate constants
Bonding to dentin is critically influenced by the age and mineral content and the iatrogenic state of the dentin. The latter is affected by altering the smear layer, which leads to a mineral-deprived, collagen-rich surface. Various treatments aimed at
A previous report (Mueller, IMS, Ottawa, Canada, 1998) revealed that the modeled equivalent electrical circuits for either silver or copper surfaces were different when corroded in protein-free or protein-containing solutions. The objective of this study
A formalism is introduced to describe a number of physical processes that may break down the coherence of a matter wave over a characteristic length scale l. In a second-quantized description, an appropriate master equation for a set of bosonic modes (such
Joseph M. Antonucci, Walter G. McDonough, Gary E. Schumacher, Y Shimada
Enamel and dentin are anisotropic materials because of their highly oriented microstructures that arises from the prismatic apatite structure of enamel and the tubular structure of dentin, respectively. The purpose of this study was to examine the regional
Observations of non-linear transport characteristics in nanoscale junctions triggered interest in phenylene ethynylene oligomers as potential electronic switching elements. Motivated by suggestions of vibronic origins for this behavior, we have studied
Objectives: This study investigated the hypothesis that varying the acetone content of single solution dentin bonding agents may affect the adhesive layer thickness and microtensile bond strength (MTBS) of the bonded complex, and explored whether the
Due to the high frequency sampling of on-line data acquisition systems, most of the on-line data are auto correlated. The autocorrelation of the process data has impacts on the applications of statistical analysis methodologies since the assumption of
We studied the elastic and anelastic properties of an alloy steel containing 1.1 mass % copper subjected to various isothermal agings. The steel's hardness increases with aging time; after reaching a maximum, it decreases. Peak hardness was 17% higher than
Using acoustic-resonance spectroscopy, we measured the three independent Voigt C kj (C 11, C 12, C 44) of cubic-symmetry galena (lead sulphide). Our results clarify the discrepancies of previous reports. We report also the internal friction Q -1 ij, the
This paper derives expressions for the overall average elastic constants and thermal expansion coefficients of a polycrystal in terms of its single crystal components. The polycrystal is assumed to be statistically homogeneous, isotropic, and disordered