We present an extensive study of the radiative transfer in dusty galaxies based on Monte Carlo simulations. The main output of these simulations are the attenuation curves Aλ (i.e. the ratio between the observed, dust extinguished, total intensity to the intrinsic unextinguished one of the galaxy as a function of wavelength). We have explored the dependence of Aλ on a conspicuous set of quantit...

We propose a monolithic narrowband guided-mode grating filter in fused silica that is widely tunable in the near-IR wavelength region. Based on a recently demonstrated approach for a monolithic reflector comprising an encapsulated grating, we theoretically investigate such a device by means of rigorous modeling aimed at a narrow linewidth. It is demonstrated that upon a spatial variation of the...

Many WDM architectures are based onJixed wavelength channels which require the lasers to be tuned to their channels accurately. Achieving this task is difJicult and costly especially in the distributed environments. Robust WDM is an approach that tolerates large laser wavelength variations, due to temperature drifts and manufacturing tolerances. A reservation-based medium access protocol is use...

A systematic study on the uncertainty in spectral responsivity of silicon photodiodes due to the calibration spectral bandwidth is presented. Two of the most common types of silicon photodiodes in the field of optical power measurements have been used in this work: one with thickness of about 100 nm of SiO2 and the other with thickness about 27 nm of SiO2. It is shown that the spectral responsi...

Two experiments demonstrated the pigeon's sensitivity to ultraviolet light. In Experiment I, pigeons' responses were reinforced on a multiple schedule with a variable-interval reinforcement schedule in one component and extinction in the other component. Response rates were quite different in the two components where the 520-nm stimuli signalling each component differed only in that one of them...

This paper presents an acquisition system and a procedure to capture 3D scenes in different spectral bands. The acquisition system is formed by a monochrome camera, and a Liquid Crystal Tunable Filter (LCTF) that allows to acquire images at different spectral bands in the [480, 680]nm wavelength interval. The Synthetic Aperture Integral Imaging acquisition technique is used to obtain the elemen...

We analyzed high resolution spectra of interstellar C I absorption toward λ Ori, 1 Sco, and δ Sco that were obtained with the Goddard High Resolution Spectrograph on the Hubble Space T elescope. Several multiplets were detected within the wavelength interval 1150 to 1200Å, where most C I lines have ill-defined oscillator strength; multiplets at longer wavelengths with well-defined atomic parame...