1,720,987 research outputs found
The Entrepreneurship SIG at the European Academy of Management: Setting the Base for Tomorrow's Challenges
No full textThis third volume of the book series The Entrepreneurship SIG at the European Academy of Management brings together contributions on aspects characterizing the field of entrepreneurship, such as entrepreneurial behavior and mindsets and business models, but addressed in light of some of the dynamics of change that characterize the current context, such as digitalization. Moreover, the book also discusses emerging issues in academic debate, including in the wake of the recent COVID 19 pandemic, such as resilience, and relevant business contexts, such as that of family businesses. The book valorizes different contexts and key strengths of the European perspective
European entrepreneurship research and practice: a multifaceted effort towards integration of different perspectives
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Local structure of ternary semiconducting random solid solutions: EXAFS of Cd1-xMnxTe
No full textThe nearest-neighbor distances around Te atoms in the random semiconducting alloy Cd1-xMnxTe have been determined by the extended x-ray-absorption fine-structure technique. The distribution of the anion-cation distances is bimodal. A model of the microscopic structure of the zinc-blende-type A1-xBxC ternary alloys based on a random distribution of cations has been developed. The model describes the bimodal distribution of nearest-neighbor distances in terms of distortion of the anion sublattice, using only the lattice constant of the alloy and the bond-stretching constants of each binary component. Within the framework of this model we consider also the problem of the structural stability of Cd1-xMnxTe
Thermodynamic properties of ternary semiconducting alloys
No full textUsing the new information supplied by EXAFS fine structure measurements and the results of our structural model, we compute the bond probability of a few ternary semiconducting III-V and II-VI alloys as a function of temperature and composition in the framework of a modified quasi-chemical approximation. We derive the thermodynamic functions of mixing, considering both elastic and chemical contributions to the bond energies. We examine how the deviation from the full randomness affects the ordering of such alloys and we construct the phase diagrams in the region of phase separation. Possible formation of ordered compounds at low temperatures is predicted
The local structure of random ternary alloys: experiment versus theory
No full textWe have performed an extended x-ray-absorption fine-structure (EXAFS) measurement of Cd1-xMnxTe solid solutions for various concentrations x in the single-phase range 0≤x≤0.7. Data have been collected on the Mn K, Cd LIII, and Te LIII edges. We have found well-defined different nearest-neighbor Cd-Te and Mn-Te distances almost independent of x. A model of the microscopic structure of the zinc-blende-type A1-xBxC ternary alloys based on a random distribution of cations has been developed. The model describes the bimodal distribution of near-neighbor distances in terms of distortion of the anion sublattice (the cation sublattice is assumed to remain fixed) with use only of the lattice constants of the alloy and the bond-stretching constants of each binary component. Its application to Cd1-xMnxTe and In1-xGaxAs alloys is proved to be in good agreement with the EXAFS results. Within the framework of this model we also consider the problem of the structural stability of Cd1-xMnxTe
Crystallographic structure of ternary semiconducting alloys
No full textRecent EXAFS experiments have revealed that the crystallographic structure of semiconducting ternary alloys is considerably distorted in comparison with zinc-blende structure. We have used the Valence-Force-Field model and the Monte-Carlo simulation properties of constituents the lattice distortion of these alloys at any arbitrary concentration. These results form the basis of the detailed interpretation of the EXAFS data. All the experimental features, including the radial distribution function broadening and the multi-modal behaviour, can be reproduced with high accuracy. We show that the distortion of the mixed sublattice is, contrary to expectations, quite large. The estimate of the elastic contribution to the enthalpy of mixing is given for both InGaAs and CdZnTe
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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