Abstract A simple model wavefunction, consisting of a linear combination of two free-particle Gaussians, describes many of the observed features seen in the interactions of two isolated Bose-Einstein condensates as they expand, overlap, and interfere. We show that a simple extension of this idea can be used to predict the qualitative time-development of a single expanding BEC condensate produce...

A skywave signal is one has propagated by reflecting off the ionosphere. These signals are common in low frequency (LF) broadcast. However, in Loran, these signals are nuisances since they interfere with the more stable groundwave signal. Loran-C was designed with mitigations for the most common forms of skywave interference. However, these mitigations are not adequate to mitigate early skywave...

The purpose of this paper is to evaluate the impact of adjacent channel interference in network coverage and capacity, and find a strategy to minimize it. This strategy consists of identifying the optimal spacing between adjacent carriers in the radio spectrum available for use. To define this strategy, first the issue of dead zones is analyzed. Here, for different spacing between adjacent carr...

Holography is an optical technique for reconstructing the wave which is scattered by an object (1-4). The reconstruction of an object-scattered wave provides a three-dimensional image retaining the amplitude-attenuating and phase-retarding properties of the object. Holographic images have unique properties which are useful in biological research. A hologram is made by illuminating an object wit...

We have investigated spin-wave excitations in rolled-up Permalloy microtubes using microwave absorption spectroscopy. We find a series of quantized azimuthal modes which arise from the constructive interference of Damon-Eshbach-type spin waves propagating around the circumference of the microtubes, forming a spin-wave resonator. The mode spectrum can be tailored by the tube's radius and number ...

Wave BLOCKINpropagation BLOCKINin BLOCKINdisordered BLOCKINmedia BLOCKINis BLOCKINa BLOCKINrich BLOCKINand BLOCKINlong-standing BLOCKINproblem BLOCKINthat BLOCKINattracts many efforts, both theoretical and experimental. After almost a century of a complete sway of radiative transport and diffusion approaches, it recently became clear that the interference of multiply-scattered fields (which is ...

We study the classical and quantal ionization dynamics of a one-dimensional system by strong, low-frequency electric fields with slowly varying envelopes. We show that classical ionization can be described using the principle of adiabatic invariance, if the driving frequency is sufficiently small, and that after ionization the atomic potential does not significantly alter the motion. This dynam...

With the goal of decreasing the interference at sub-carrier level, the allocation of sub-carrier frequencies in an OFDMA based system is selective. This selective allocation can be seen like a permutation of a frequency “sequence”. This paper proposes a new analyzing tool for the frequencies permutation used in WiMAX mobile communications: the distances spectrum (DS). This tool can offer a mean...

Abstract. We extend an above barrier analysis made with the Schrödinger equation to the Dirac equation. We demonstrate the perfect agreement between the barrier results and back to back steps. This implies the existence of multiple (indeed infinite) reflected and transmitted wave packets. These packets may be well separated in space or partially overlap. In the latter case interference effects ...

transport across nanostructured thin films Z. T. Tian, B. E. White, Jr., and Y. Sun Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA Department of Physics and the Materials Science Program, Binghamton University, Binghamton, New York 13902, USA Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, Pen...