We demonstrate a fiber-tip photoacoustic spectrometric sensor for trace gas detection. The sensor head is a miniature fiber-tip hollow-cavity with a deflectable polymer diaphragm. Periodic light absorption of gas molecules within the cavity generates an acoustic pressure wave, which causes deflection of the diaphragm. The hollow cavity also is a Fabry-Perot interferometer with which the diaphra...

Businesses are beginning to use virtual worlds as an innovative means for collaboration and learning among virtual team members, with the intention of harnassing increasing flow of ideas from individuals, and higher levels of productivity within the company. Virtual worlds have paved a new and important channel for user collaboration and information sharing. Motivated by this phenomenon and dra...

The intent of this paper is to explore the implications of the social aspects enabled by virtual world technology on an individual’s intention to use the technology. We identify variables such as social awareness, social interaction, and social quality that may play an important role. We test our research model by means of a controlled laboratory experiment conducted in a virtual world, Second ...

This paper investigates international technology diffusion through trade and patenting in a sample of 48 countries for the period 1980 – 2000. We divide the sample in three income groups to detect different patterns of technology absorption. Our results show that rich countries benefit from domestic technology and foreign technology embodied in imported capital goods, middle-income countries en...

a r t i c l e i n f o Tacit knowledge affects the trade-off between entrepreneurship and technology transfer. I present a formal model in which an inventor and the existing firm engage in a strategic innovation game by choosing whether to compete or to cooperate through technology transfer. The model highlights how the problem of tacit knowledge affects the inventor's R&D investment and the exi...

The combustion of fossil fuels emits a large amount CO 2 , which causes the greenhouse effect and leads to global warming poses serious threat life on earth. capture technology can effectively reduce concentration in atmosphere, alleviate effect, improve environment. technologies include absorption, membrane separation adsorption separation, among chemical absorption have advantages high effici...

A pulsed metalorganic chemical vapor deposition (MOCVD) technique, specifically designed for high quality AlN/GaN superlattices (SLs) is introduced. Optical quality and precise controllability over layer thicknesses are investigated. Indium is shown to improve interface and surface quality. An AlN/GaN SL designed for intersubband transition at a telecommunication wavelength of ~1.5 μm, is grown...