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Search Results: 1 - 10 of 351542 matches for " S. Yi "
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Modeling and Simulation of Mechanical Properties of Nano Particle Modified Polyamide 6  [PDF]
I. Yi, J. Wiedmaier, S. Schmauder
Journal of Materials Science and Chemical Engineering (MSCE) , 2015, DOI: 10.4236/msce.2015.31012
Abstract:

This paper discusses the utilization of nano-sized fillers in Polyamide 6 to increase the fracture resistance of the composites, which are crucial for various engineering applications. The toughening of the composites is achieved by using dispersed nano-scaled rubber particles (Polyether block copolymer) as the inclusion in Polyamide 6 matrix. For a better understanding of the mechanical behavior of the composites, it is indispensable to use analytical and numerical models for evaluating the overall mechanical behavior and damage mechanism of the composite. In this work the toughening mechanism is studied through literature review and by analytical modeling. The mechanical behavior of the composites such as elastic plastic and damage properties are calculated numerically with 3D representative volume element (RVE) models. The numerical results are compared with previously obtained experiments. The influence of volume fraction and aspect ratio of inclusions on the macroscopic stress strain curve as well as the size effect of inclusions and also the failure properties of the composite are studied in detail.

Non-Hermitian quantum canonical variables and the generalized ladder operators
W. S. l'Yi
Physics , 1995, DOI: 10.1103/PhysRevA.53.1251
Abstract: Quantum canonical transformations of the second kind and the non-Hermitian realizations of the basic canonical commutation relations are investigated with a special interest in the generalization of the conventional ladder operators. The operator ordering problem is shown to be resolved when the non-Hermitian realizations for the canonical variables which can not be measured simultaneously with the energy are chosen for the canonical quantizations. Another merit of the non-Hermitian representations is that it naturally allows us to introduce the generalized ladder operators with which one can solve eigenvalue problems quite neatly.
Calibrating dipolar interaction in an atomic condensate
S. Yi,L. You
Physics , 2004, DOI: 10.1103/PhysRevLett.92.193201
Abstract: We revisit the topic of a dipolar condensate with the recently derived more rigorous pseudo-potential for dipole-dipole interaction [A. Derevianko, Phys. Rev. A {\bf 67}, 033607 (2003)]. Based on the highly successful variational technique, we find that all dipolar effects estimated before (using the bare dipole-dipole interaction) become significantly larger, i.e. are amplified by the new velocity-dependent pseudo-potential, especially in the limit of large or small trap aspect ratios. This result points to a promising prospect for detecting dipolar effects inside an atomic condensate.
Spontaneous spin textures in dipolar spinor condensates
S. Yi,H. Pu
Physics , 2006, DOI: 10.1103/PhysRevLett.97.020401
Abstract: We have mapped out a detailed phase diagram that shows the ground state structure of a spin-1 condensate with magnetic dipole-dipole interactions. We show that the interplay between the dipolar and the spin-exchange interactions induces a rich variety of quantum phases that exhibit spontaneous magnetic ordering in the form of intricate spin textures.
Coordinate-space holographic projection of fields and an application to massive vector fields
W. S. l'Yi
Physics , 1998,
Abstract: General properties of coordinate-space holographic projections of fields in AdS/CFT correspondence, which respect the Ward identity, are investigated. To show the usefulness of this methodology it is applied to the computation of correlators of massive gauge fields.
Trapped atomic condensates with anisotropic interactions
S. Yi,L. You
Physics , 2000, DOI: 10.1103/PhysRevA.61.041604
Abstract: We study the ground state properties of trapped atomic condensates with electric field induced dipole-dipole interactions. A rigorous method for constructing the pseudo potential in the spirit of ladder approximation is developed for general non-spherical (polarized) particles interacting anisotropically. We discuss interesting features not previously considered for currently available alkali condensates. In addition to provide a quantitative assessment for controlling atomic interactions with electric fields, our investigation may also shed new light into the macroscopic coherence properties of the Bose-Einstein condensation (BEC) of dilute interacting atoms.
Trapped condensates of atoms with dipole interactions
S. Yi,L. You
Physics , 2000, DOI: 10.1103/PhysRevA.63.053607
Abstract: We discuss in detail properties of trapped atomic condensates with anisotropic dipole interactions. A practical procedure for constructing anisotropic low energy pseudo potentials is proposed and justified by the agreement with results of numerical multi-channel calculations. The time dependent variational method is adapted to reveal several interesting features observed in numerical solutions of condensate wave function. Collective low energy shape oscillations and their stability inside electric fields are investigated. Our results shed new light into macroscopic coherence properties of interacting quantum degenerate atomic gases.
Correlators of currents corresponding to the massive $p$-form fields in AdS/CFT correspondence
W. S. l'Yi
Physics , 1998, DOI: 10.1016/S0370-2693(99)00009-X
Abstract: By solving the equations of motion of massive $p$-form potential in Anti-de-Sitter space and using the $AdS/CFT$ correspondence of Maldacena, the generating functional of two-point correlation functions of the currents is obtained. When the mass parameter vanishes the result agrees with the known massless case.
Generating functionals of correlation functions of p-form currents in AdS/CFT correspondence
W. S. l'Yi
Physics , 1998, DOI: 10.1016/S0370-2693(98)01457-9
Abstract: The generating functional of correlation functions of the currents corresponding to general massless $p$-form potential is calculated in $AdS/CFT$ correspondence of Maldacena. For this we construct the boundary-to-bulk Green's functions of $p$-form potentials. The proportional constant of the current-current correlation function, which is related to the central charge of the operator product expansion, is shown to be $c=(d-p\over 2\pi^{d/2}) (\Gamma (d-p) \over \Gamma ({d\over 2}-p)).$ The result agrees with the known cases such as $p=1$ or 2.
Probing dipolar effects with condensate shape oscillation
S. Yi,L. You
Physics , 2001, DOI: 10.1103/PhysRevA.66.013607
Abstract: We discuss the low energy shape oscillations of a magnetic trapped atomic condensate including the spin dipole interaction. When the nominal isotropic s-wave interaction strength becomes tunable through a Feshbach resonance (e.g. as for $^{85}$Rb atoms), anisotropic dipolar effects are shown to be detectable under current experimental conditions [E. A. Donley {\it et al.}, Nature {\bf 412}, 295 (2001)].
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