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.
Space charge accumulation behaviors at voltage polarity reversal in cross-linked polyethylene (XLPE) and in improved XLPE for dc cable are observed using pulsed electro-acoustic (PEA) method. A huge amount of so called a packet like charge, which was enough to enhance the electric field significantly, is generated in XLPE at the polarity reversal, while it is not observed in the improved XLPE. It...
Space charge accumulation characteristics in Epoxy resin with various heat treatments were investigated under DC high stress using as pulsed-electro acoustic (PEA) method. Epoxy resin has been used as sealing material for semiconductor devices. Recently, a new semiconductor like silicon carbide (SiC) has been developed to use it at high temperature environment. However, the conventional epoxy resin...
A large quantity of hetero charge was observed in polyimide (Kapton®-H) film subjected to high electrical stress of 100kV/mm and under the condition of high humidity. In order to investigate the hetero charge accumulation, Quantum Chemical Calculation was applied to a small piece of polyimide specimen for obtaining an energy band structure, a band gap and an electric carrier trap level. Furthermore,...
The relationship between space charge accumulation and breakdown at various temperatures is investigated by observing the space charge formation in low density polyethylene (LDPE) and LDPE/MgO nanocomposite material under dc high stress. We have reported, earlier, that, enhancement of electric field in LDPE by packet-like charge under dc stress might be a cause of its electrical breakdown. Furthermore,...
Two main problems in the manipulation of objects with robot-hands are the control of the contact force and the planning of approaching motion. In this paper, we report on the three types of MEMS sensors for robots to detect the contact forces, slippage and the distance to the objects to realize dexterous manipulation of objects with robot-hands. As a tactile sensor, we propose standing piezoresistive...
Space charge behavior has been investigated in LDPE/MgO composite films including the different size of MgO particles with a diameter of several tens nm (nano) or a few mum (micro) when a dc high stress is applied to the sample at high temperature. It is believed that a positive packet-like charge is injected from the anode, and after that a negative packet charge is injected from the cathode. In...
A dental magnetic attachment is a denture retainer with a permanent magnet. It has been suggested that such attachment possesses many advantages compared with conventional mechanical attachments, which often pose problems of retentive force durability as well as of esthetics. However, magnetic attachments have not been put into practical use because of the insufficient magnetic attractive force and...
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.