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.
This letter presents a study of bend discontinuities in the substrate integrated gap waveguide (SIGW), and proposes a simple solution to minimize the discontinuity effects. Both curved and chamfered right-angle bends are studied. It is found that with a proper ratio of the chamfered length and the bend via diameter, the possible cavity resonances can be suppressed and the desired performance is achieved...
In order to obtain the influence of metallic particles on the insulating performance of vegetable insulating oil, copper particles were chosen to contaminate the vegetable insulating oil. The AC breakdown voltage of rapeseed insulating oil with different copper particle concentrations was measured. The dielectric properties i.e. relative permittivity, dielectric loss tangent and volume resistivity...
The dielectric properties of transformer oil are greatly threatened by particles especially the metallic particles. In order to obtain the influence of metallic particles on frequency domain spectroscopy (FDS) of mineral oil, we chose copper particles to contaminate the mineral oil artificially. The dielectric properties such as relative permittivity, dielectric loss tangent and volume resistivity...
The vegetable insulating oil is applied increasingly as dielectric liquid in transformers, but it is vulnerable to particles especially the metallic particles. In this paper, focus is made on the influence of metallic particles such as copper and iron particles on the breakdown strengths of vegetable insulating oil. The relationship of AC breakdown strengths and the metallic particle concentration...
Creep corrosion is the corrosion of the copper (and sometimes silver) metallization on PCBs and the creeping of the corrosion product (mostly sulfides of copper and sometimes silver) on the board surfaces which may lead to the electrically shorting of neighboring features on PCBs. The problem of creep corrosion has been largely brought under control by selecting finishes, by trial and error, that...
This paper presents a configuration of 3D-chip stacks with internal channel cooling that include high thermal conductivity layers, channels for heat transport by pneumatic fluid flow, regulation of fluid velocity by channel obstructions bumps, enhanced thermal conductivity across the channel by metal spacers, wiring re-distribution layers (RDL) and electrical continuity across the cooling channels...
In this paper, using reflection coefficients of electromagnetic wave in metal surface, calculation formula of efficiency due to reflector antenna surface ohmic loss are derived. Ohmic loss efficiencies of different high reflectivity reflector antenna metal surface are calculated at frequencies 100~300GHz. Calculating results of ohmic loss efficiency have great benefit to the design and performance...
The DNA damage and subcellular of copper (Cu) in 8-day-exposure winter wheat (Triticum aestivum L.) were studied to determine Cu genotoxicity mechanisms and compartmentalization. The results showed Cu induced DNA damage significantly in all treated plants, roots are more cytotoxic and genotoxic than shoots. The translocation factors (ratio of Cu concentrations in shoots to those in roots) were from...
With the Web content having been changed from homogeneity to heterogeneity, the recommendation becomes a more challenging issue. In this paper, we have investigated the recommendation problem on a general heterogeneous Web social network. We categorize the recommendation needs on it into two main scenarios: recommendation when a person is doing a search and recommendation when the person is browsing...
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.