The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Continuous application of high voltages in an underground cable can cause slow deterioration of its insulation system. Electronic charges can be generated within the medium of the material and this can lead to permanent change of its dielectric properties to withstand high electrical stresses. The long-term degradation of underground cable insulation plays an important role in its eventual breakdown...
Insulation of an underground cable that has been in service for a very long time is subjected to various degrees of degradation. The degradation can lead to premature breakdown of its insulation, and the cost of replacing the cable can be very expensive. Thus there is a constant need from power utility companies' point of view to continuously monitor the condition of cable insulation in order to ensure...
Since insulation plays a significant role in ensuring the reliability of an polymeric underground cable, many researchers across the globe are very much interested to investigate the mechanisms responsible for insulation degradation when it is subjected to high electrical stresses. One of the ways to monitor the processes leading to breakdown is by observing a phenomenon known as electroluminescence...
Polymeric-insulated power cables are often subjected to multiple sources of degradation. Generally, the main cause for electrical breakdown in this type of cable insulation is usually due to the microscopic impurities and defects located in the bulk, or even at the interfaces of the material. When the dielectric is subjected to a high electrical stress, imperfections such as protrusions, contaminants...
The photoplethysmography (PPG) is a non invasive method, which is suitable to measure blood volume change. In this research, second derivative method of PPG (SDPPG) was used for monitoring the arterial condition. Data from eleven healthy volunteers were used to analyze the changes in the SDPPG waveform during rest position and immediately ten minutes after exercise. The results showed that SDPPG can...
Under continuous application of high electrical stresses, the insulation system of an underground power cable is subjected to long-term degradation that can eventually cause premature breakdown of the cable. This is as a result of electronic charges being injected into the dielectric material when intense electric field is applied. These charges will then interact with polymer molecules; causing even...
This study examines the variation of photoplethysmogram (PPG) morphology based on a sample by recording PPG finger tips from erectile dysfunction (ED) patients. Nine PPG indexes are calculated along with carotid intima-media thickness (CIMT) for all patients. The measured parameters are statistically analyzed and their association is shown in results section. These results show that PPG can be used...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.