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.
Recently, tremendous utilization of wireless networks has led to sever scarcity of radio spectrum resources. TV White Spaces (TVWSs) as novel bands enabling Cognitive Radio (CR) technology to improve spectrum resources utilization, have attracted significant standardisation efforts such as IEEE 802.11af, IEEE 802.16h and 802.22. As these heterogeneous networks may operate on the same channels of TVWSs,...
Energy efficiency is an important issue for cognitive radio networks, in which each cognitive user must acknowledge experienced environment, besides maintaining communication. Existing works on energy efficiency have been focused on power control in traditional networks (e.g. CDMA network), supposing that the network environment is static. However, there has not been works on energy efficiency under...
This paper reports the fabrication and photovoltaic (PV) demonstration of macro-length, micron-diameter hairlike solar cells. In this design of cylindrical silicon solar cell with a radial p-n architecture, the carbon fiber (CF) serves as the core electrode as well as fabrication substrate, and polysilicon (poly-Si) is used as the shell photoactive material. Uniform deposition of poly-Si on the cylindrical-shape...
This paper reports a room-temperature fabrication process for production of localized regions of highly-loaded carbon nanotube (CNT) networks within the surface layers of polydimethylsiloxane (PDMS). These bilayer micro-structures are formed by electrophoretic deposition (EPD) of CNTs into a patterned mold, followed by a transfer-micromolding step. The fabricated CNTs/PDMS bilayer exhibits flexibility,...
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.