10,108 research outputs found
Ultra-Strong Optomechanics Incorporating the Dynamical Casimir Effect
We propose a superconducting circuit comprising a dc-SQUID with mechanically
compliant arm embedded in a coplanar microwave cavity that realizes an
optomechanical system with a degenerate or non-degenerate parametric
interaction generated via the dynamical Casimir effect. For experimentally
feasible parameters, this setup is capable of reaching the single-photon,
ultra-strong coupling regime, while simultaneously possessing a parametric
coupling strength approaching the renormalized cavity frequency. This opens up
the possibility of observing the interplay between these two fundamental
nonlinearities at the single-photon level.Comment: 7 pages, 1 figure, 1 tabl
Designing-in of Quality Through Axiomatic Design
Decisions made during the design
stage of product & process development profoundly affect product
quality and process productivity. To aid in design decision making,
a theoretical framework is advanced: the axiomatic approach
to design. Axiomatic design consists of: 1) domains in the design
world, 2) mapping between these domains, 3) characterization of
a design by a vector in each domain, 4) decomposition of the
characteristic vectors into hierarchies through a process of zigzagging
between the domains, and 5) the design axioms, viz, Independence
& Information Axioms. Statistical process control
(SE) and other methodologies to improve quality are valid only
when they are consistent with the Independence & Information Axioms.
This paper presents several criteria that govern the design
& manufacture of quality products, To be able to control the quality
of products, a design must satisfy the Independence Axiom. Based
on this axiom and some theorems, several design criteria are
derived & discussed. These criteria provide the bounds for the
validity of some of the SPC techniques being used. When there is
more than one acceptable design of a product or process, the Information
Axiom must be used to select the best design(s)
Ferromagnetic resonance imaging of Co films using magnetic resonance force microscopy
Lateral one-dimensional imaging of cobalt (Co) films by means of microscopic ferromagnetic resonance (FMR) detected using the magnetic resonance force microscope (MRFM) is demonstrated. A novel approach involving scanning a localized magnetic probe is shown to enable FMR imaging in spite of the broad resonance linewidth. We introduce a spatially selective local field by means of a small, magnetically polarized spherical crystallite of yttrium iron garnet (YIG). Using MRFM-detected FMR signals from a sample consisting of two Co films, we can resolve the âŒ20 ÎŒm lateral separation between the films. The results can be qualitatively understood by consideration of the calculated spatial profiles of the magnetic field generated by the YIG sphere
Ion pairing in model electrolytes: A study via three particle correlation functions
A novel integral equations approach is applied for studying ion pairing in
the restricted primitive model (RPM) electrolyte, i. e., the three point
extension (TPE) to the Ornstein-Zernike integral equations. In the TPE
approach, the three-particle correlation functions are obtained. The TPE results are compared to molecular
dynamics (MD) simulations and other theories. Good agreement between TPE and MD
is observed for a wide range of parameters, particularly where standard
integral equations theories fail, i. e., low salt concentration and high ionic
valence. Our results support the formation of ion pairs and aligned ion
complexes.Comment: 43 pages (including 18 EPS figs) - RevTeX 4 - J. Chem. Phys. (in
press
Enhancement of wear properties of a polyether ether ketone polymer by incorporation of carbon and glass fibers
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