1,721,097 research outputs found
The role of the Quaternary environmental changes in shaping the diversity of European trees and shrubs
No full textBeamforming-aided processing of EEG signals for analyzing epileptic seizures
No full textAutomatic detection of epileptic seizures, by means of on-line or off-line procedures, is a matter of continuous research that commits many research groups. Electroencephalografic (EEG) detection is affected by interference due to specific electrode interference that can be removed by different techniques, namely, beamforming, proposed in this paper. This technique allows improving epilepsy identification technique without performing a precise selecting of higher-order spectra
Robust Spectral Leak Detection of Complex Pipelines using Filter Diagnonalization Method
No full textThe control and managing of pipelines have been assuming a major importance for all kinds of fluids to be conveyed through. When the fluid is like oil, harmful liquid and/or water for human beings necessity, the monitoring of pipelines becomes extremely fundamental. Based on the reflexion according to fast detecting systems, spectral analysis response is a topic of interest. Among spectral analysis response techniques, fast Fourier transform (FFT) is rated. Different other techniques are utilized, but they are costly and difficult to be used. An interesting technique, used in nuclear magnetic resonance data processing, filter diagonalization method (FDM), for tackling FFT limitations, can be used, by considering the pipeline, especially complex configurations, as a vascular apparatus with arteries, veins, capillaries, etc. The thrombosis, for human vascular apparatus, that might be occur, can be considered as a leakage for the complex pipeline. The research proposes the use of FDM according to two sub techniques called algorithm I and algorithm II. The first algorithm is a direct transformation of FDM application, while the second includes robustness and a regularization technique to solve ill-posed problems that may emerge in processing data. The results are encouraging
LED-Based Sensing system for Biomedical Gas Monitoring: Design and Experimentation of a Photoacoustic Chamber
No full textAn efficient and portable photoacoustic multi-gas monitor for biomedical application is needed in hospital in order to detect indoor gas pollution, r to protect the health of workers, patients and visitors. If the highest precision is not required, especially for continuous monitoring of anaesthetic gases, a LED-based (light emitting diode) detecting system can be employed in order to estimate an attention threshold level of gas. This paper illustrates a design and characterization of a led-based photoacoustic chamber (sensing-actuating system and cell) for anaesthetic gas detection. A measurement campaign has been conducted in a surgery room; the results have been compared with another photoacoustic instrumentation used simultaneously. The main asset of the new system is a double source of LED light instead of a more traditional system
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