20,777 research outputs found
Transport properties of continuous-time quantum walks on Sierpinski fractals
We model quantum transport, described by continuous-time quantum walks
(CTQW), on deterministic Sierpinski fractals, differentiating between
Sierpinski gaskets and Sierpinski carpets, along with their dual structures.
The transport efficiencies are defined in terms of the exact and the average
return probabilities, as well as by the mean survival probability when
absorbing traps are present. In the case of gaskets, localization can be
identified already for small networks (generations). For carpets, our numerical
results indicate a trend towards localization, but only for relatively large
structures. The comparison of gaskets and carpets further implies that,
distinct from the corresponding classical continuous-time random walk, the
spectral dimension does not fully determine the evolution of the CTQW.Comment: 10 pages, 6 figure
Self-forming shim or gasket for mounting heavy equipment
Soft, cross-serrated aluminum shims are used as mating gaskets between uneven surfaces. Under pressure, the aluminum flows to conform with surface irregularities, forming a plane of uniform bearing
Radiation data definitions and compilation for equipment qualification data bank
Dose definitions, physical properties, mechanical properties, electrical properties, and particle definitions are listed for insulators and dielectrics, elastomeric seals and gaskets, lubricants, adhesives, and coatings
Composite gaskets are compatible with liquid oxygen, resist compression set
Gaskets fabricated by laminating fluorocarbon polymers with fiber glass cloth have a low compression set. Their flexibility is not subject to drastic changes at the temperature of liquid oxygen with which they are used. The fabrication process is controlled so that the fibers are not impregnated with the polymer
Singular integrals on Sierpinski gaskets
We construct a class of singular integral operators associated with
homogeneous Calder\'{o}n-Zygmund standard kernels on -dimensional, ,
Sierpinski gaskets . These operators are bounded in and their
principal values diverge almost everywhere, where is the
natural (d-dimensional) measure on
On the Local-Global Conjecture for integral Apollonian gaskets
We prove that a set of density one satisfies the local-global conjecture for
integral Apollonian gaskets. That is, for a fixed integral, primitive
Apollonian gasket, almost every (in the sense of density) admissible (passing
local obstructions) integer is the curvature of some circle in the gasket.Comment: 64 pages, 3 figures; Appendix by Peter Varj
O-ring gasket test fixture
An apparatus is presented for testing O-ring gaskets under a variety of temperature, pressure, and dynamic loading conditions. Specifically, this apparatus has the ability to simulate a dynamic loading condition where the sealing surface in contact with the O-ring moves both away from and axially along the face of the O-ring
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