The static electric polarizability of a particle bound by a finite potential well

In this paper we derive an expression for the static electric polarizability of a particle bound by a finite potential well without the explicit use of the continuum states in our calculations. This will be accomplished by employing the elegant Dalgarno-Lewis perturbative technique.Comment: 14 Pages, 2 Table

Ground State of the Hydrogen Atom via Dirac Equation in a Minimal Length Scenario

In this work we calculate the correction to the ground state energy of the hydrogen atom due to contributions arising from the presence of a minimal length. The minimal length scenario is introduced by means of modifying the Dirac equation through a deformed Heisenberg algebra (kempf algebra). With the introduction of the Coulomb potential in the new Dirac energy operator, we calculate the energy shift of the ground state of the hydrogen atom in first order of the parameter related to the minimal length via perturbation theory.Comment: 11 page

Extraction of acoustic sources for multiple arrays based on the ray space transform

In this paper we present a source extraction technique for multiple uniform linear arrays distributed in space. The technique adopts the Ray Space Transform representation of the sound field, which is inherently based on the Plane Wave Decomposition. The Ray Space Transform gives us an intuitive representation of the acoustic field, thus enabling the adoption of geometrically-motivated constraints in the spatial filter design. The proposed approach is semi-blind since it needs as input an estimate of the source positions. We prove the effectiveness of the proposed solution through simulations using both white noise and speech signals

Efficient Localization and Tracking of Two Acoustic Sources using Particle Filters with Swarm Intelligence

Publication in the conference proceedings of EUSIPCO, Poznan, Poland, 200

Experimental evaluation of a localization algorithm for multiple acoustic sources in reverberating environments

Publication in the conference proceedings of EUSIPCO, Florence, Italy, 200

Reading in the Zone of Proximal Development: Mediating Literacy Development in Beginner Readers through Guided Reading

Because the term direct instruction has been and is used broadly, it has come to define all types of explicit teaching. Thus, a traditional basal approach - where children are grouped for instruction by their abilities (high, average, and low) and where the teaching is often predetermined or scripted - is unwittingly compared to guided reading. The major objective of this article is to demonstrate that the fundamental difference between the two approaches lies in pitching instruction to the child\u27s literacy level and the need for dynamic grouping of children for instruction