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Penn Physicists Discover Why Drying Liquid Crystal Drops Leave Unusual “Coffee Rings”（图）
Penn Physicists Drying Liquid Crystal Drops Coffee Rings
2017/7/21
In previous papers, University of Pennsylvania physicists investigated the “coffee ring effect,” the ring-shaped stain of particles left after drops of coffee evaporate. In one paper, they learned how...
UMD Physicists Discover “Smoke Rings” Made of Laser Light（图）
UMD Physicists Smoke Rings Laser Light
2016/9/29
Most basic physics textbooks describe laser light in fairly simple terms: a beam travels directly from one point to another and, unless it strikes a mirror or other reflective surface, will continue t...
Synchronous phase-demodulation of concentric-rings Placido mires in corneal topography and wavefront aberrometry (theoretical considerations)
Synchronous phase-demodulation concentric-rings Placido mires corneal topography wavefront aberrometry Optics
2012/4/20
This paper presents a digital interferometric method to demodulate Placido fringe patterns. This method uses a computer-stored conic-wavefront as reference carrier. Even though, Placido mires are wide...
Quantum Monte Carlo facing the Hartree-Fock symmetry dilemma: The case of hydrogen rings
Quantum Monte Carlo Hartree-Fock hydrogen rings
2011/8/5
Abstract: When using Hartree-Fock (HF) trial wave functions in quantum Monte Carlo calculations, one faces, in case of HF instabilities, the HF symmetry dilemma in choosing between the symmetry-adapte...
On rings of commuting partial differential operators
partial differential operators Algebraic Geometry
2011/7/27
Abstract: We give a natural generalization of the classification of commutative rings of ordinary differential operators, given in works of Krichever, Mumford, Mulase, and determine commutative rings ...
Q-tubes, Q-rings and Q-crusts
Q-tubes Q-rings Q-crusts
2010/12/24
We re-analyse scalar field theories which allow Q-ball solutions. We find new types of non-topological solitons: tube-shaped in SO(2) models, ring-shaped in SO(3) models, and crust-shaped in SO(3)\ti...
Superposition states of ultracold bosons in rotating rings with a weak potential barrier
Superposition states ultracold bosons weak potential barrier
2010/11/23
We study ultracold bosons in a one-dimensional rotating ring lattice with a weak potential barrier well below unit filling. Due to the potential barrier the eigenstates are superpositions of different...
Bound states and persistent currents in topological insulator rings
Bound states persistent currents
2010/11/25
We analyze theoretically the bound state spectrum of an Aharonov Bohm (AB) ring in a twodimensional topological insulator using the four-band model of HgTe-quantum wells as a concrete example.
Oceanic rings and jets as statistical equilibrium states
Oceanic rings jets equilibrium states
2010/11/16
Equilibrium statistical mechanics of two-dimensional flows provides an explanation and a prediction for the self-organization of large scale coherent structures. This theory is applied in this paper t...
Instability and Vortex Rings Dynamics in a Three-Dimensional Superfluid Flow Through a Constriction
Instability Vortex Rings Three-Dimensional Superfluid Flow
2010/11/25
We study the instability of a superfluid flow through a constriction in three spatial dimensions.We consider a Bose-Einstein condensate at zero temperature in two different geometries: a straight wave...
Magnetic forces and localized resonances in electron transfer through quantum rings
Magnetic forces localized resonances electron transfer
2010/11/19
We study the current ow through semiconductor quantum rings. In high magnetic eld the current is usually injected to the arm of the ring preferred by classical magnetic forces. However, for narrow ma...
Analytical treatment of the nonlinear electron cloud effect and the combined effects with beam-beam and space charge nonlinear forces in storage rings
electron cloud effect beam-beam effect space charge effect BEPCⅡ
2009/8/17
In this paper we treat first some nonlinear beam dynamics problems in storage rings, such as beam dynamic apertures due to magnetic multipoles, wiggles, beam-beam effects, nonlinear space charge effec...
Quantum Rings with Two Deeply Bound Electrons under a Magnetic Field
quantum ring fractional Aharonov-Bohm oscillation persistent current
2007/8/15
2007Vol.47No.4pp.733-736DOI:
Quantum Rings with Two Deeply Bound Electrons under a Magnetic Field
SITU Shu-Ping
Department of Physics, Sun Yat-Sen University, Guangzhou ...
Persistent Current in Two Connected Mesoscopic Rings with Reservoirs
persistent current Aharonov-Bohm effects mesoscopic rings
2007/8/15
2003Vol.39No.3pp.359-364DOI:
Persistent Current in Two Connected Mesoscopic Rings with Reservoirs
WEI Jian-Hua,1 CHEN Yan-Xue,1 XIE Shi-Jie,1
MEI Liang-Mo,1 and HONG Jongbae2
...
Distribution of Circles on a Circle and Correlation Between Vortex Rings of Superfluids
Superfluid vortex vortex rings vortex pattern circles on a circle
2010/4/9
Superfluids are characterized by absence of viscosity. When superfluids are rotated, differently from normal fluids, they form more than one vortex in the containers where they are placed. The number ...