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In the SmartPush project professional editors add semantic metadata to information flow when the content is created. This metadata is used to filter the information flow to provide the end users with a personalized news service. Personalization and delivery process is modeled as software agents, to whom the user delegates the task of sifting through(More)
Digitalization of content and exponential growth of Internet and electronic commerce are changing the media industry. The availability of structured content enables new ways to produce and deliver information. This paper explains the role of semantic metadata in developing content for an adaptive news service in the SmartPush-project. In SmartPush, news(More)
Zinc oxide ͑ZnO͒ is a wide-band gap semiconductor that has attracted tremendous interest for optical, electronic, and mechanical applications. First-principles calculations by ͓C. G. Van de Walle, Phys. Rev. Lett. 85, 1012 ͑2000͔͒ have predicted that hydrogen impurities in ZnO are shallow donors. In order to determine the microscopic structure of hydrogen(More)
The pressure response of the ultraviolet photoluminescence of ZnO nanocrystallites and MgZnO nanoalloy of composition 15% Mg:85% Zn of the wurtzite structure was studied. The authors found that up to 7 GPa the pressure coefficients of ZnO and MgZnO are 23.6 and 27.1 meV/ GPa, respectively. The pressure coefficient of the ZnO nanocrystallites is similar to(More)
Zinc oxide ͑ZnO͒ is a wide-band-gap semiconductor with potential optical, electronic, and mechanical applications. First-principles investigations ͓C. showed that a local vibrational mode at 3326.3 cm −1 , at liquid-helium temperatures, corresponded to an O-H type bond. The microscopic structure of this hydrogen complex, however, was not determined. In this(More)
Zinc oxide (ZnO) has emerged as a leading material for micro-and optoelectronic applications. Although the fabrication of ZnO, from nanocrystals to bulk single crystals, is well established, a major roadblock for fabricating optoelectronic devices is the lack of reliable p-type doping. The presence of compensating donors inhibits the growth of p-type ZnO.(More)