1,721,045 research outputs found
GaN-on-Porous Silicon for RF Applications
No full textThis research has been supported by the Win4Company funding of the Walloon Region (GaNGSTER project) and the Fonds pour la Formation a la Recherche dans l'Industrie et dans l'Agriculture (FRIA), FNRS, Belgium
dfm/tinygp: tinygp v0.2.1
No full textRelease Notes: https://tinygp.readthedocs.io/en/latest/news.html
New Contributors:
@yadav-sachin made their first contribution in https://github.com/dfm/tinygp/pull/66
Full Changelog: https://github.com/dfm/tinygp/compare/v0.2.0...v0.2.
Time Dependence of RF Losses in GaN-on-Si Substrates
No full textGaN-on-Si HEMT technology suffers from RF losses and non-linearities originating from the conductive Si substrate. The understanding and modeling of substrate performance are the keys to enabling next-generation front-end modules. In this letter, we show that when subjected to a chuck bias step, the effective substrate resistivity of a typical C-doped HEMT stack shows a dynamic behavior. Using a dedicated setup, stress/relaxation sequences at different temperatures are performed to understand this phenomenon. With the help of TCAD simulations, it is shown that redistribution of charges trapped in deep defects located in the III-N buffer can qualitatively explain the observed trends. Trap activation energies of 0.43 and 0.33 eV are extracted from measured data
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
Modeling and Control of a Solid State Transformer and verification with Controller Hardware in the Loop
No full textClimate change is driving the evolving energy mix in the world. The amount of renewables are rising to avoid the detrimental effects of fossil fuels to the environment. Solar and wind power are the major players in the rising renewable energy mix. Most of these power generation sources are interfaced through power electronic converters. In the future, it is foreseen that the amount of renewables in the distribution shall increase. The power system is designed to handle the unidirectional flow of power. However, with the increased renewables, the power flow becomes bidirectional. This leads to stability issues in the power system. Solid State Transformers (SST) are envisaged to mitigate these issues by providing advanced functionalities like reactive power support, DC power generators and storage integration among others.FLEXstation project is a Dutch government subsidized project which deals with building an SST. The SST shall be installed the distribution grid. In this thesis, the model and control algorithm for the transformer are discussed. Also, a controller hardware in the loop setup is made using two renowned makes of real time simulators namely OPAL-RT and dSpace. The setup between the two controllers is also discussed in detail.The topology of the SST is made using a multilevel Cascaded H-Bridge (CHB) converter as the grid interface and Dual Active Bridge (DAB) converters as high frequency links between the MV and LV side converters. The balancing of the capacitor voltage of the multilevel converter is discussed. It is shown that due to the difference in the properties of DAB high frequency transformer, the capacitor voltages do not get perfectly balanced through the conventional method used in the literature. The issue is solved using DABs for balancing the capacitor voltages. The capability of the DABs are further utilized to decouple the active power flowing through the capacitors. The method can be used to significantly reduce the capacitor sizes thus reducing the cost and size of the converter
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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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