Fourier Decomposition Analysis af Anisotropic Inhomogeneous Dielectric Waveguide Structures

In this paper we extend the Fourier decomposition method to compute both propagation constants and the corresponding electromagnetic field distributions of guided waves in millimeter-wave and integrated optical structures. Our approach is based on field Fourier expansions of a pair of wave equations which have been derived to handle inhomogeneous mediums with diagonalized permittivity and permeability tensors. The tensors are represented either by a grid of homogeneous rectangles or by distribution functions defined over rectangular domains. Using the Fourier expansion, partial differential equations are converted to a matrix eigenvalue problem that correctly models this class of dielectric structures. Finally numerical results are presented for various channel waveguides and are compared with those of other literatures to validate our formulation

Some aspects of inclusive nucleon production processes

An explicit Mueller-Regge model (with poles only) is constructed for the investigation of single-particle-inclusive processes in the quasi-two-body and triple-Regge subspace of the fragmentation region. The model is then applied in studies of nucleon production processes. The inclusive cross sections are considered and compared with the available data. The qualitative agreement between the cross section data and the model is reasonable, but the model is not satisfactory in details. Regge cuts are introduced into the model via the absorption model prescription. Then nucleon production processes are reinvestigated in this modified model and the polarization of the produced nucleon is predicted. The model is applied to Lambda production (in a nucleon interaction), and the agreement between theoretical prediction and the experimental data for the polarization of the Lambda in the small p region is remarkable. Finally, the model is applied to tensor meson production and the cross section and the spin density matrix elements are predicted.<p

Realization of Receptive Fields with Excitatory and Inhibitory Responses on Equilibrium-State Luminescence of Electron Trapping Material Thin Film

Our theoretical modelings and experimental observations illustrate that the equilibrium-state luminescence of electron-trapping materials (ETMs) can be controlled to produce either excitatory or inhibitory responses to the same optical stimulus. Because of this property, ETMs have a unique potential in optical realization of neurobiologically based parallel computations. As a classic example, we have controlled the equilibrium-state luminescence of a thin film of this stimulable storage phosphor to make it behave similarly to the receptive fields of sensory neurons in the mammalian visual system, which are responsible for early visual processing

Dynamics of electron-trapping materials under blue light and near infrared exposure: an improved model

Dynamics of electron-trapping materials (ETMs) is investigated. Based on experimental observations, evolution of the ETM\u27s luminescence is mathematically modeled by a nonlinear differential equation. This improved model can predict dynamics of ETM under blue light and near-infrared (NIR) exposures during charging, discharging, simultaneous illumination, and in the equilibrium state. The equilibrium-state luminescence of ETM is used to realize a highly nonlinear optical device with potential applications in nonlinear optical signal processing

Optical Realization of the Retinal Ganglion Receptive Fields in Electron-Trapping Material Thin Film

Optical control of the electron-trapping material is used to model the retinal ganglion cell’s receptive field. Using this approach all the retinal image processing can be done on the surface of a thin film of this material

Optical Realization of Bio-inspired Spiking Neurons In Electron Trapping Material Thin

A thin film of electron-trapping material (ETM), when combined with suitable optical bistability, is considered as medium for optical implementation of bio-inspired neural nets. The optical mechanism of ETM under blue light and NIR exposure has the inherent ability at the material level to mimic the crucial components of the stylized Hodgkin-Huxley model of biological neuron. Combining this unique property with high resolution capability of ETM, a dense network of bio-inspired neurons can be realized in a thin film of this infrared stimulable storage phosphore. The work presented here, when combined with suitable optical bistability and optical interconnectivity, has the potential of producing an artificial nonlinear excitable medium analogue to cortical tissue

Self-Organization in a Parametrically Coupled Logistic Map Network: A Model for Information Processing in the Visual Cortex

In this paper, a new model seeking to emulate the way the visual cortex processes information and interacts with subcortical areas to produce higher level brain functions is described. We developed a macroscopic approach that incorporates salient attributes of the cortex based on combining tools of nonlinear dynamics, information theory, and the known organizational and anatomical features of cortex. Justifications for this approach and demonstration of its effectiveness are presented. We also demonstrate certain capabilities of this model in producing efficient sparse representations and providing the cortical computational maps

An analytic model for the dynamics of electron trapping materials with applications in nonlinear optical signal processing

In this paper the optical mechanism and dynamics of electron trapping material under simultaneous illumination with two wavelengths is investigated. Our analytical model proves that the equilibrium state luminescence of such a material can be controlled to produce highly nonlinear behavior with potential applications in nonlinear optical signal processing and optical realization of nonlinear dynamical systems. Combining this new approach with state-of-the-art fast spatial light modulators and CCD cameras that can precisely control and measure exposure, large arrays of nonlinear processing elements can be accommodated in a thin film of this material

Teaching in a Tea House

Librarians have made laudable efforts in developing information literacy instruction (ILI) programs, and in working with K-12 and public libraries, leveraging efforts to prepare students for college and university-level work, supporting lifelong learning. However, up to now few may have asked key questions across libraries of all types regarding a broader, more sequential approach to lifelong information literacy. What came before and what comes after your ILI efforts at your institution and beyond? Does your ILI build on what came before and offer additional foundation for what may come after? Who contributes to ILI, in which arenas, and how? How can we all best contribute to helping develop a populace with questioning, critical thinking, and researching knowledge and skills clearly understood and integrated into school, work, and personal/leisure activities and endeavors throughout a lifetime? LILi, a group of librarians from a spectrum of California libraries (university, college, community college, school, government, public and special libraries), is investigating IL definitions, standards and instruction in California. LILi began by mounting an online survey and promoting it to over 13,000 California libraries of all types. A quick review of initial responses revealed surprises, including this: librarians are teaching in a tea house! Other interesting findings are bound to surface as LILi analyzes this ILI snapshot and begins to… Explore what different types of libraries are teaching their users regarding IL; Identify gaps and overlaps among their efforts; Suggest at which age and educational level gaps and overlaps occur; Consider whether overlaps reinforce earlier instruction or not, and if so, what should be taught repeatedly and at which levels; Consider who should be responsible for teaching various IL competencies, and at which levels; Suggest what should be emphasized at various points throughout a lifelong ILI sequence