1,720,955 research outputs found
Numerical simulation of free convection of nanofluids
Get PDFV diplomskem delu smo predstavili numerično simulacijo prenosa toplote za primer naravne konvekcije nanotekočin v različnih modelih z različno geometrijo. Nanotekočina je suspenzija enakomerno porazdeljenih nanodelcev v vodi. Najprej smo izvedli primer naravne konvekcije vode v kubični kotanji in določili validacijski model. Naše rezultate smo primerjali z viri drugih avtorjev in ugotovili dobro ujemanje. Izdelali smo simulacije za različne vrste nanotekočin pri različnih koncetracijah nanodelcev. Na koncu smo rezultate analizirali in ugotovili, da nam nanotekočine omogočajo izboljšanje procesa prenosa toplote.The thesis presents a numerical simulation of heat transfer by natural convection of nanofluids in different models with different geometry. Nanofluid is a suspension of evenly distributed nanoparticles in water. First, we performed natural convection of water in a cubic cavity and determined the validation model. Our results were compared with the resources of other authors, it was found that the results match. We have produced simulations for different types of nanofluids at different concentrations of nanoparticles. Results were analyzed and found that nanofluids allow us to improve the heat transfer process
Overall equipment effectiveness of automatic molding line
Get PDFMagistrsko delo se osredotoča na celovito učinkovitost avtomatske formarske linije in razvrščanje zastojev v skupine 6 velikih izgub, na realnem primeru. Najprej so predstavljena teoretična izhodišča ter proizvodni proces, ki je potreben za kvalitetno izdelane ulitke. V zadnjem delu naloge pa so predstavljeni pridobljeni OEE kazalniki in skupine 6 velikih izgub proizvodnega procesa. Na podlagi rezultatov so bile potrjene zastavljene hipoteze. Ugotovljeno je bilo, da so kazalniki OEE v livarni nujno potrebni, saj nam pridobljeni podatki omogočajo dober pregled nad vsakodnevnim delom in bodo v prihodnosti nujno potrebni za spremljanje rezultatov pri optimizaciji proizvodnega procesa.The master\u27s thesis focuses on the overall equipment efficiency of the automatic molding line and the classification of downtime into groups of 6 big losses, on a real case. First I present the theoretical starting points and production process, which is required for high-quality castings. In the end of the thesis I present the obtained OEE indicators and the groups of 6 big loses of production system. On the base of results I did confirm the set hypothesis. During the thesis it was discovered, that OEE indicators are a must in the foundry, as the data obtained allows us a good overview of daily work and will be necessity in the future to monitor the results in optimizing the production process
Design of the road bridge with timber load-bearing structure
Get PDFDiplomska naloga obravnava statično analizo in dimenzioniranje mostu z leseno nosilno konstrukcijo, ki je namenjen cestnemu prometu. V nalogi so določeni glavni vplivi na mostno konstrukcijo, narejena je statična in modalna analiza v računalniškem programu Sofistik. Dimenzionirani so nosilni elementi mostu in njihovi priključki. Projektiranje je narejeno v skladu z evropskim standardom Evrokod, kjer so upoštevani parametri iz nacionalnega dodatka. Most, ki ga projektiramo ni resničen in smo si njegovo nosilno konstrukcijo zamislili na podlagi že obstoječih podobnih lesenih mostov. Lokacija mostu je izbrana na regionalni cesti v naselju Luče, kjer prečka reko Savinjo.
Razpon mostu znaša 32 m, njegova širina pa 7 m. Primarna nosilna konstrukcija mostu sta dve razpori na obeh straneh mostu, na kateri je v temenu razpor z jeklenimi vešalkami obešen jekleni HEB profil. Preko jeklenega profila, ki predstavlja podporo na sredini razpona, poteka 8 vzdolžnih nosilcev, ki nosijo voziščno ploščo. Voziščna plošča je narejena iz pokonci obrnjenih lesenih moralov, ki so postavljeni prečno na vzdolžne nosilce in so med sabo povezani z mozniki. Obe razpori imata kraka povezana z jekleno vodoravno vezjo, zato se v podporah pojavi samo vertikalna reakcija. Razpori in vzdolžni nosilci so pravokotnega prereza in narejeni iz lepljenega lameliranega lesa kakovosti GL-36h, morali pa so iz lesa kvalitete D60.The subject of thesis is static analysis and design of a timber bridge, with a structure that is designed for road transport. In the thesis we set out the main actions on the bridge and we made static and modal analysis with the computer program Sofistik. We also designed load-bearing elements and their connections. The design has been done in accordance with the European standard Eurocode, where the National Annex has been taken into consideration. The bridge which we have designed does not exist and we have conceived the load-bearing structure on the basis of already existing similar timber bridges. Location of the bridge was selected on the main road in the village Luče, where it crosses the river Savinja.
Span of the bridge is 32 m and its width is 7 m. The primary load-bearing structure of the bridge consists of two struts on both sides of the bridge which supports steel HEB beam through vertical hangers. On top of the steel beam, which is in the middle of the span, takes place eight longitudinal timber beams, bearing timber deck. Timber deck is made of a wooden, upright facing planks that are positioned perpendicular to the longitudinal beams and are connected with dowels. Both struts are linked with steel cables and therefore there are only vertical reactions in supports. Struts and longitudinal beams are rectangular and made of glued laminated timber GL-36H, the planks are of timber D60
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
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