1,721,109 research outputs found
Semiconductor Laser Dynamics
Get PDFThis is a collection of 18 papers, two of which are reviews and seven are invited feature papers, that together form the Photonics Special Issue “Semiconductor Laser Dynamics: Fundamentals and Applications”, published in 2020. This collection is edited by Daan Lenstra, an internationally recognized specialist in the field for 40 years
Nonlinear behavior of multi-excitonic recombinations in quantum dots
No full textWe studied quantum dot arrays using m-PL measurements. Clear multi-excitonic spectra
are observed, which are attributed to homogeneous ensembles of QDs in the array. The
spectra can be explained by applying a Hartree-Fock based model including the twobody
Coulomb and exchange interactions. Eight lines in the m-PL spectrum are
attributed to bi-exciton, excited bi-exciton and multi-exciton transitions. These lines
show a clear nonlinear behavior since they only appear at high excitation power
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Electrorefraction in quantum dots
No full textWe developed a model to calculate the electrorefraction due to the Quantum Confined
Stark Effect in strained cylindrical QDs. We followed a numerical matrix diagonalization
method using an expansion in plane-wave states. The correct polarization dependence is
obtained by using the 4X4 Luttinger-Kohn Hamiltonian for the valence band. The exciton
wavefunction is also calculated using a diagonalization approach. We will present the
absorption spectra as a function of applied electric field and dot dimensions and discuss
the implications for the electrorefraction
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Quantum tunneling transport of electrons in double-barrier heterostructures : theory and modeling
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