1,721,010 research outputs found
Interview with Milad Hanna, El-Sayed Al-Moatasem and Haider Ibrahim
No full textفي هذه المقابلة، يتحدث السيد المعتصم حاكم، مسؤول العلاقات الخارجية للحزب الاتحادي الديموقراطي، والدكتور حيدر إبراهيم، والدكتور ميلاد حنا عن الأحداث في السودان بعد الإجراءات الأخيرة التي أصدرها الرئيس عمر البشير لحل السلطة المزدوجة في السودن. أجرت الحوار إيمان رافع.In this interview, El-Sayed Al-Moatasem, the Democratic Unionist Party's spokesman for foreign relations, Dr. Haider Ibrahim, and Dr. Milad Hanna discuss what has happened in Sudan since President Omar Al-Bashir recently took steps to end the country's dual system of government. The interview was conducted by Iman Raf
Quantum Chemistry Treatment of Silicon-Hydrogen Bond Rupture by Nonequilibrium Carriers in Semiconductor Devices
No full textThe interaction of charge carriers with hydrogen-related defects plays a key role in modern semiconductor applications. Particularly in the field of micro- and nanoelectronics, where silicon together with amorphous gate oxides is still the technology of choice, Si-H bonds participate in a rich variety of phenomena. For example, the passivating nature of H and its influence on surface reconstruction are fundamentally useful features for modern technologies and emerging research fields alike. However, the dissociation of Si-H bonds results in electrically active defects and is associated with a number of device reliability issues. In this work we develop a general quantum kinetic formulation to describe the dynamics of bond excitation and breaking. The wealth of experimental and theoretical studies on Si-H bond breaking induced by energetic carriers enables us to extract the most useful excitation pathways. Based on the open-system density-matrix theory we develop a model that accounts for all relevant system-bath interactions: vibrational relaxation and dipole scattering as well as resonance-induced excitation. In contrast to existing theoretical studies, our model is coupled to a Boltzmann transport equation solver, which is required for the correct consideration of nonequilibrium carrier energy distribution functions occuring in an electronic device. Finally, we apply our framework to model Si-H bond breakage at the Si/SiO2 interface and validate our approach against different experimental data sets. The results provide a fundamental understanding of Si-H dissociation mechanisms and allow for an accurate microscopic description of hot-carrier-induced damage at the device level. Due to the model formulation being free of empirical parameters, the approach can be easily applied to future technologies and materials systems
Quantum Chemistry Treatment of Silicon-Hydrogen Bond Rupture by Nonequilibrium Carriers in Semiconductor Devices
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First Principles Approach to Study Topologically Protected Edge States in 1T′ MoS2 Nanoribbons
No full textGoing 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
Ballistic Conductance, k. p Hamiltonian, Nanoribbons, Subbands, Topological Insulators (TIs), Topologically Protected Edge States
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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
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
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