1,721,008 research outputs found
Small- and large-signal characterization of trap-rich HR-Si/HR-SOI wafers for SoC applications
No full textFor the last five years the semiconductor industry has evolved from a quest to get more logic and computational power to one that looks for more performance, more functionalities and less power consumption. This change, driven by the increasing demand of all sort of mobile devices and smart sensors, requires not only logic power and memory but also multi-standard wireless communication capabilities, sensing functionalities, and more important, longer battery life, thus low power operation. Systems-on-chip (SoC) are meant to integrate in a single chip not only the logic of one or several processors, but also graphical and power management units, power amplifiers, passive components, transceivers, and memory components. SoC with fully integrated multi-band multi-standard transceivers and RF front-ends are needed. HR-Si is currently used for the fabrication of RF circuits and HR-SOI substrates are now a mature and cost-effective technology for future SoCs. Unfortunately, their lossless RF capabilities are limited by the presence of a parasitic surface conduction. In addition, HR-Si and HR-SOI presents non-linear behaviour under large signal operation and the substrate electrical properties are frequency and voltage dependent.
In this thesis, a CMOS compatible Si-based substrate for the integration of RF systems, named trap-rich HR-SOI, are investigated. The small-signal and large-signal performance of a series of Si, HR-Si, HR-SOI, trap-rich HR-Si, and (for the first time) commercial trap-rich HR-SOI wafers are characterized. The presence of trap-rich layer helps recovering the high-resistivity nominal and linear characteristics of HR-Si substrates. Moreover, compared to Si substrates, it also reduces the substrate crosstalk between adjacent devices. It is shown that the effective resistivity is a powerful figure-of-merit able to quantify the high-resistivity characteristics and nonlinear properties of HR-SOI and trap-rich HR-SOI substrates. Experimental measurements and physically-based simulations demonstrate that trap-rich HR-SOI substrates with effective resistivities higher than 3 kΩ-cm have excellent lossless and linear properties. Therefore, trap-rich HR-SOI wafers can be used for the integration of RF front-end in SoCs, with comparable performances to other more classical, and expensive, substrate solutions as SOS, SOQ or SOG.(FSA 3) -- UCL, 201
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
Variations on the Author
Full text link“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
Full text linkWe 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
RF Harmonic Distortion of CPW Lines on HR-Si and Trap-Rich HR-Si Substrates
No full textIn this paper, the nonlinear behavior of coplanar waveguide (CPW) transmission lines fabricated on Si and high-resistivity (HR) Si substrates is thoroughly investigated. Simulations and experimental characterization of 50- CPW lines are analyzed under small- and large-signal operation at 900 MHz for a wide variety of Si substrates with nominal resistivities from 10 up to values higher than 10 . The introduction of a trap-rich layer to recover the Si substrate nominal HR characteristics is also considered. We experimentally demonstrate that the distortion level of a CPW line lying on Si substrate decreases with the effective resistivity sensed by the coplanar structure. Si substrates of effective resistivity higher than 3 present harmonic levels below 80 dBm for an output power of 15 dBm
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe 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
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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