9762 papers found
The aim of this study is to compare methods for T-wave end detection and QT interval computation and to discuss the importance of interactive result verification. The comparison includes methods for minima detection, a regression method and a method based on signal derivation. All these methods were tested on ECG data with high QT interval variability and high signal distortion.
In the present paper is presented a method for on-line measurement using a complex system for environmental monitoring whit a prototype data acquisition board. A study for Taguchi-type gas sensor using the data acquisition board will be performs.
This work proposes the development of an air pollution model based on a joined application of Kalman filter and Kriging technique. The use of modelling techniques in data environmental analysis allows to characterize the pollutants behaviour, in order to validate the measured data and to predict the values of contaminant substances emissions; so it results a very useful analysis tool, especially when there are numerous missing or erroneous data. The joint applications of both Kalman filter and Kriging algorithms allows taking the main advantages of two different methods, in order to improve...
This paper presents a smart sensor designed for oil-on-water thickness and water conductivity measurements. Basically, the proposed sensing devices include a capacitive element used to measure oil thickness and a conductivity element to measure water conductivity. Temperature compensation of measured values is also provided by including an additional temperature sensor in the system. The main characteristics of the smart sensor system include pulse-width modulation of sensors’ output signals, auto-calibration capability and temperature error compensation. Field applications are not...
Mathematical models of protective dikes are used for forecasting of extreme hydrological situations. For purposes of calibration and verification of these models, the physical modelling is used. Physical model creates the dike of defined parameters (dimensions, material, time of loading, etc.) equipped with proper sensors and instrumentation, which is mostly tested in laboratory conditions. The results of two electronic methods monitoring investigated effects are discussed.
In this work, measurements are given of ohmic resistances in samples of fitted anti-static flooring. The measurement procedures were based on the relevant regulations DIN 51953 and DIN 53482. The measurement values that are shown concern various types of aged anti-static flooring that is commonly found and used in intensive care facilities such as operating theatres, extra care treatment rooms, areas with Computer Tomography systems, etc. Furthermore it presents measurements of new types of anti-static flooring for reasons of comparison. All results are presented in table form and are...
The present paper gives a quality measurement methodology based on a complex analysis of internal and external indicators and of the relationship existing between the two ones. The result of the proposed methodology application is to dispose of an operative tool to apply appropriate corrective actions to get the quality characteristic monitored on the nominal value. Moreover, an application of the proposed methodology to a water supply company is presented.
Video surveillance systems are consolidated techniques for the monitoring of eruptive phenomena in volcanic areas. Along with this systems, which use standard video cameras, sometimes people working on this field make use of infrared cameras providing useful information about the thermal evolution of the eruptions. The surveillance of the Mount Etna volcano in Sicily, Italy, is in charge of the Istituto Nazionale di Geofisica e di Vulcanologia - Catania site, and a large amount of monitoring systems are installed along the mountain. Data transmission between these devices and the...
This paper presents a design of a multichannel measurement system for nondestructive inspection of oil-well casing's mechanical properties (i.e. tube wall thickness and inner diameter), employing pulsed eddy current (PEC) technique. A specific feature of the system is its operation in high-temperature environment (typically up to 175°C), which requires simple and robust circuits, low part-count probe design, low power consumption and proper automated measurement algorithms to ensure reliable operation. Based on our previous work on PEC method, we propose an inspection tool, consisted of a...
The task of detecting changes between two image frames is obstructed by the influence of noise and by the existence of ambient illumination variations between the image frames. The former is an inherent property of all electronic imaging devices. The latter appears when changes in camera exposure or white balance settings occur and tends to degrade the efficiency of change detection, if left untreated prior to frame differencing. An additional difficulty lies in the fact that a change detection process is required to accurately detect illumination changes in the presence of both luminance...