In this paper, a three-dimensional, single-phase proton-exchange membrane fuel cell (PEMFC) is studied numerically. Finite volume method was used for solving the governing equations and, consequently, the numerical results were validated by comparing them with experimental data, which showed good agreement. The main objective of this work is to investigate the effect of a novel gas channel shap...

Ing. José Avelino Manzano Lizcano, Estudiante PhD-ETSIT-UPM-España, Ingeniero de Telefónica de España, [email protected] Ing. y MSc. Samuel Ángel Jaramillo Flórez, Estudiante PhD-ETSIT-UPM-España, Profesor Titular-IEE-UPB, [email protected] Abstract Indoor multpropagation channel is modeled by the Kaiser electromagnetic wavelet. A method for channel characterization ...

Reaction times for detecting sinusoidal gratings depend jointly on grating contrast and spatial frequency. We examine whether the effect of spatial frequency results from low-pass filtering in a single channel or reflects processing of different frequencies by two or more different processing streams. Observers performed a speeded two-alternative spatial forced-choice detection. Errors and reac...

This paper presents the results of simulation experiments that successfully demonstrate FM co-channel voice separation via cross coupled phase locked loops (CCPLL). Unlike previous CCPLL studies which are typically restricted to the situation where the FM modulation waveforms are steady state sinusoidal, triangular, etc., we have empirically determined CCPLL loop parameters that provide for sta...

A key element for many fading-compensation techniques is long-range prediction of the fading channel. A linear approach, usually used to model the time evolution of the fading process, does not perform well for long-range prediction. In this article, we propose an adaptive channel prediction algorithm using a state-space approach for the fading process based on the sum-sinusoidal model. Our sim...

conclusions atypical irregular tumors should be considered as sos when the patient has received oxaliplatin-based chemotherapy. a qualitative imaging modality diagnosis, such as with diffusion-weighted mri, is superior to a morphological diagnosis in focal sos. this imaging modality can prevent unnecessary operations. case presentation a 40-year-old woman with rectal cancer underwent high anter...

The sinusoidal speech model represents a speech signal as a linear combination of sinusoids with time-varying parameters {amplitudes, frequencies, and phases}. However, one drawback of this model is that the analysis window width is generally fixed in analyzing the signal. Since each sinusoidal parameter has different frequencies, an analysis window with fixed width can’t guarantee an optimum s...

This is an attempt to model an unsteady peristaltic flow of micro-polar fluid in a channel of finite length. The channel is subjected to progressive sinusoidal waves that help the walls contract and relax but not expand beyond the natural boundary. It is found that the coupling number increases pressure along the entire length of the channel, while the micro-polar parameter decreases it. The co...

Virtual Microphone Control (ViMiC) is a real-time multichannel spatial sound rendering technique based on sound recording principles. In an auditory virtual environment, ViMiC simulates multichannel microphone techniques, resulting in the characteristic Inter-Channel Time Differences (ICTD) and Inter-Channel Level Differences (ICLD) to create the spatial image of a sound scene. When virtual sou...