1,721,235 research outputs found
Impiantazione ionica e laser annealing a bassa potenza: studio degli effetti microstrutturali mediante microscopia elettronica ad alta risoluzione.
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XHRTEM observations of different damage structures in high temperature implanted GaAs
No full text140 keV Zn+ ions have been implantedon (1 0 0) GaAs surfaces at a dose of 1014 cm 2 andd ifferent ion fluxes and substrate temperatures. The resulting damage in the implanted samples has been studied by cross sectional high resolution transmission electron microscopy showing different features depending on the implantation substrate temperature and on the ion flux. The observed damage is discussed in terms of the competing mechanisms of ion beam induced amorphization and ion beam induced epitaxial crystallization showing that the balance between them strongly affects both the amount of damage and its typology
Nucleation and first-stage growth processes of extrinsic defects in GaAs triggered by self-interstitials
No full textThe growth process of small self-interstitial clusters In (n≤7) in crystalline GaAs has been addressed by semi-empirical tight-binding molecular-dynamics technique. The In ground-state structures have been found among many possible choices of topological properties and stoichiometric compositions. The stable structure have been fully characterised concerning the structural, electronic, energetic, and elastic properties; some remarkable findings emerged concerning, among the others, the stability scenario of the ground-state structures, the possible low-energy reaction paths involved in the growth process, the electrostatic and the elastic capture volumes and the Fermi-level pinning. It is demonstrated that compact geometries are no longer energetically favoured for n 5 and that the In growth proceeds via capture processes involving either isolated interstitials or di-interstitials. An extended pentainterstitial (I5) ground-state structure has been identified as the possible core-basic structure of extrinsic linear defects along the {111} direction of the GaAs lattice. © 2009 The American Physical Society
Organizational Learning and Cognition Building Systems fo the learning organization
No full textManaging organizational cognition and learning has been the subject of many studies and publication and is considered a major source of competitive advantage in the knowledge-based economy in knowledge intensive and traditional business. Organizational Cognition and Learning: Building Systems for the Learning Organization addresses the concept of organizing that is centered around collective learning in organizations and on the learning organization paradigm. Organizational Cognition and Learning: Building Systems for the Learning Organization presents a theory of organizational learning based on a model of organizational memory, explaining organizational processes and dynamics through which organizational memory is built and updated. Organizational Cognition and Learning: Building Systems for the Learning Organization provides a methodology and several tools to elicit and map organizational memory contents, based on the analysis and modelization of discourses through qualitative and quantitative techniques, examples of applications, implications for practice, and a research agenda for the development of methodologies and systems for the learning organizations
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