1,720,969 research outputs found
Heat treatment of aluminum alloy AlSi7Mg0,6 fabricated by metal 3D printing
No full textAuthor tries to obtain new information about the influence of different heat treatments on SLM fabricated AlSi7Mg0,6 alloy, its mechanical properties and residual stress. For this purpose were chosen parameters of heat treatment based on previous research of other authors. With the use of normalised tensile strength test specimens and special specimens for analysis of deformation caused by the residual stress were the influences studied. Author checked the influence of stress relieving annealing, parameters of precipitation hardening and artificial ageing on mechanical properties and residual stress in the material. Results can help fabrication of studied material to receive required properties and eliminate the deformation caused by the residual stress
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
No full text“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
No full textWe 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
Design and optimization of a combustion chamber with a grate for fuel mix
No full textPráce zahrnuje rešerši problematiky spalování na roštu, která slouží k sestavení výpočetního nástroje ve formě interaktivního skriptu v programovacím jazyku Matlab. Program je použit pro získání parametrů zařízení v závislosti na zadaných vlastnostech vstupující palivové směsi, pro nalezení vhodné konstrukce s ohledem na technologické požadavky a zpracování základní modelové a výkresové dokumentace.The thesis contains literature research in grate firing, leading to compilation of a computing tool in form of an interactive script written in the scripting language Matlab. The program is subsequently used for calculation of the apparatus’ parameters, finding the optimal design with respect to technological requirements and creation of basic model and drawings.
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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
Design of pneumatic transport of bulk substances
No full textPráce se zabývá problematikou pneumatické dopravy sypkých materiálů, konkrétně výpočtem tlakových ztrát v potrubních systémech a návrhem optimalizačního algoritmu pro efektivní dimenzování trasy. V úvodu je představena teorie vícefázového proudění, charakteristika jednotlivých dopravních režimů, a rozbor vlivů, které mají zásadní dopad na chování směsi. Hlavní část práce je věnována návrhu výpočetního programu v jazyce Python, který umožňuje iterativní výpočet tlakových ztrát na základě uživatelsky zadaných vstupních parametrů. Program zohledňuje jednotlivé orientace potrubí, výškové rozdíly, ztráty od tření, urychlení a místní odpory. Součástí řešení jsou rovněž moduly pro optimalizaci vnitřního průměru potrubí a dopravní rychlosti, jejichž cílem je minimalizace energetické náročnosti systému. Výsledky byly ověřeny na základě dvou případových studií z energetického provozu, v nichž byly porovnány reálně naměřené a numericky vypočtené hodnoty. Odchylky se pohybovaly v přijatelném rozmezí, což potvrzuje vhodnost navrženého přístupu pro praktické inženýrské využití. Práce tak přináší ucelený pohled na návrh pneumatických tras s důrazem na efektivitu, přesnost a možnost dalšího rozšiřování modelu.This thesis addresses the issue of pneumatic transport of bulk materials, focusing on the calculation of pressure losses in pipeline systems and the design of an optimization algorithm for efficient route sizing. The introduction covers the theory of multiphase flow, the characteristics of different transport regimes, and the factors that significantly impact the behaviour of the mixture. The main part of the thesis is dedicated to designing a Python-based computational program that enables the iterative calculation of pressure losses based on user-defined input parameters. The program considers individual pipe orientations, height differences, frictional losses, acceleration, and local resistances. The program also includes modules that optimize the internal diameter of the pipeline and the conveying velocity to minimize the system's energy consumption. The results were verified by two case studies from a thermal power plant plan in which real and numerically calculated values were compared. The deviations were within an acceptable range, confirming the approach's suitability for practical engineering applications. Thus, the paper provides a comprehensive view of pneumatic route design, emphasizing efficiency, accuracy, and the possibility of further model extension.
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