1,720,957 research outputs found
Optimization of materials for microelectronics industry by in-situ coupling of electrical and structural characterization techniques
Full text linkIn microelectronics industry, one way to improve MOSFET performances is to reduce the gate “propagation” delay, i.e. the time between input and output signal in a transistor, by reducing the contact resistance between the Source/Gate/Drain and the metallic layer. These contacts are obtained by solid-state reaction of a metallic film with the Si substrate. The thermodynamics involved in these reactions are complex, especially for thin films. Thus, for a better understanding of these reactions driving forces, it is important to have a tool that enables the correlation of structural and electrical (here sheet resistance) properties during the formation of these contacts.
The aim of this study is to build a setup that allows the optimization of materials for microelectronics industry by in-situ coupling of electrical (4 points probe method for sheet resistance measurement) and structural (XRD/XRR/Raman spectroscopy) characterization techniques and then to apply and validate the performances, capabilities, limitations of our setup with different materials…
The setup consists on a heating stage that plays the role of a sample holder in a diffractometer/spectrometer while 4 tungsten based points’ probes are positioned on the sample surface and measures its sheet resistance. Both the Temperature Control Unit (TCU) and the SourceMeter are remotely controlled using a python script that reads and writes the TCU temperature and Ramp Rate (RR), and sources current and senses voltage using the SourceMeter.
Various materials that are used in STMicroelectronics high technology chips were characterized using this setup e.g. Ni(Pt), Vanadium, ITO… with a high focus on silicides. This study aims to correlate the evolution of materials electrical and structural properties driven by physical mechanisms investigated in literature review.
First, Ni(Pt) is studied. The in-situ coupling of XRD and sheet resistance measurement showed that the sheet resistance suddenly decreases at ~265°C. It corresponds to the Ni to NiSi phase transition temperature. A Raman spectroscopy analysis performed on a sample that was annealed at this temperature showed also the formation of the Ni2Si phase, and an XRR analysis showed that this phase possibly nucleates as an interlayer in the Ni/Si interface instead of clusters inside the Ni matrix.
The Kissinger method, that estimates the activation energy of the Ni to NiSi phase transition using constant ramp rate annealing, was, for the first time, enabled in our laboratory.
Measurements were performed in air atmosphere because a TiN capping layer was deposited to prevent thermal oxidation issues. The effect of alloying, i.e. metal incorporation in small quantities in the nickel layer, e.g. 10%at Pt, on sheet resistance evolution were investigated. It was shown, using an isothermal annealing, slightly above the phase transition temperature, that the amount of Pt in the Ni remaining layer increases.
Second, Vanadium thin film was also investigated. This material is very sensitive to oxidation. We showed that even with a TiN capping layer, undesired oxidation issues were observed. To check that point, we tried on another sheet resistance measurement setup (not compatible with XRD or Raman spectroscopy) but working in vacuum/inert gas heating chamber.
We can conclude from this study that a specific setup/furnace should be used for further studies, e.g. the effect of various inert gas annealing on microstructure
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
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
Author Under Sail The Imagination of Jack London, 1893-1902
No full textIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Intro -- Title Page -- Copyright Page -- Dedication -- Contents -- Acknowledgments -- Introduction -- 1. Spirit Truth -- 2. From Absorption to Theatricality and Back Again -- 3. "I Will Build a New Present" -- 4. Sons as Authors -- 5. Fathers as Publishers -- 6. The Daughter as Author -- 7. Lovers as Authors -- 8. At Sea with the Family -- 9. Yellow News, Yellow Stories -- 10. The Return Home -- Notes -- Bibliography -- Index -- About Jay WilliamsIn Author Under Sail, Jay Williams offers the first complete literary biography of Jack London as a professional writer engaged in the labor of writing. It examines the authorial imagination in London's work, the use of imagination in both his fiction and nonfiction, and the ways he defined imagination in the creative process in his business dealings with his publishers, editors, and agents. In this first volume of a two-volume biography, Williams traverses the years 1893 to 1902, from London's "Story of a Typhoon" to The People of the Abyss. The Jack London who emerges in the pages of Author Under Sail is a writer whose partnership with publishers, most notably his productive alliance with George Brett of Macmillan, was one of the most formative in American literary history. London pioneered many author models during the heyday of realism and naturalism, blurring the boundaries of these popular genres by focusing on absorption and theatricality and the representation of the seen and unseen. London created an impassioned, sincere, and extremely personal realism unlike that of other American writers of the time. Author Under Sail is a literary tour de force that reveals the full range of London as writer, creative citizen, and entrepreneur at the same time it sheds light on the maverick side of machine-age literature.Description based on publisher supplied metadata and other sources.Electronic reproduction. Ann Arbor, Michigan : ProQuest Ebook Central, YYYY. Available via World Wide Web. Access may be limited to ProQuest Ebook Central affiliated libraries
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