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Ytfinhets karakterisering av mikroprober
No full textSurface roughness and surface texture are key contributors to friction and wear. Microprobes are small, responsive tactile surface roughness sensors made from single-crystal silicon. The microprobe features a cantilever with a stylus and a strain gauge to measure the deflection of the cantilever. The intent of this thesis is to explore potential and complications of microprobes, with an industrial environment in mind.
To characterize the microprobe, four different ISO 12179 calibration measurements were performed. Two additional stability benchmarks were performed to compare results between research groups.
A printed circuit board (PCB) was developed based on a design provided by Technische Universität Braunschweig to control the microprobe. A mechanical structure was designed and constructed around the microprobe and PCB for the measurements. A transportation box was designed and 3D-printed for safer transportation of the microprobe.
The microprobe has the potential to perform very precise measurements of 10–20 nm under perfect conditions. External influences can greatly affect the precision of the microprobe. Detecting features smaller than 200 nm might not be possible in an industrial environment, as they can be indistinguishable from external vibrations and background noise.
The microprobe is sensitive to multiple external influences. Factors that can be noticed in the results are: the number of people in the room; opening and closing the room door; and covering the measurement with a cloth.
The microprobe is fragile. During attachment and bonding to PCBs, five microprobes broke. One bonding wire was detached, requiring repair; after it was dropped while unfastened in its transportation box. Two microprobes have been produced to a usable state and used in for this thesis.
This evaluation is part of the EU funded EMPIR project 17IND05 MicroProbes “Multi-functional ultrafast microprobes for on-the-machine measurements”.Ytfinhet och ytstruktur är centrala bidragande faktorer för friktion och slitage. Mikroprober är små och känsliga berörande ytfinhetsmätare som är gjorda av monokristallint kisel. Mikroproben har en konsolbalk med en mätspets och en Wheatstones brygga för att mäta böjningen av konsolbalken. Syftet med detta arbete är att klargöra mikroprobers möjliga potential och problem för en industriell miljö.
För att karakterisera mikroproben utfördes fyra ISO 12179 kalibreringsmätningar. Två ytterligare stabilitetsmätningar utfördes för att jämföra resultat mellan forskningsgrupper.
Ett kretskort utvecklades baserat på en design från Technische Universität Braunschweig för att kontrollera mikroproben. Mekanik utvecklades och konstruerades runt mikroproben och kretskortet för att möjliggöra mätningar. En transporterings låda utvecklades och 3D-printades, för att minska på transporteringsrisker.
Mikroproben har potential att utföra mycket exakta mätningar av storleksordningen 10-20 nm under perfekta förhållanden. Externa influenser kan påverka mikroprobens precision i hög grad. Detektering av funktioner som är mindre än 200 nm kanske inte är möjliga i en industriell miljö, eftersom de kan skilja sig från yttre vibrationer och bakgrundsbrus.
Mikroproben är känslig för yttre påverkan. Faktorer som är detekteras i mätresultaten är: antalet personer i rummet; öppning och stängning av rummets dörr; och täckning av mätkonstruktionen med ett tyg.
Mikroproben är ömtålig. Under fastsättningen och förbindningen till kretskorten bröts fem mikroprober. En bondtråd lossade och krävde reparation, efter att den tappats på golvet medan mikroproben inte var fastsatt i sin transporteringslåda. Två mikroprober har producerats till ett användbart tillstånd och användes inom denna avhandling.
Denna utvärdering är en del av det EU-finansierade EMPIR projektet 17IND05 MicroProbes "Multifunctional ultrafast microprobes for on-the-machine measurements"
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
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
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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