1,720,955 research outputs found
Proizvodni modeli vertikalne naftne bušotine : završni rad
No full textU teoretskom dijelu rada su ukratko opisana rješenja jednadžbe difuzije za radijalni protok
fluida iz ležišta u bušotinu, koja se koriste pri postavljanju proizvodnih modela vertikalne
naftne bušotine, u svrhu određivanja njenih proizvodnih mogućnosti. Kod ovih rješenja, koja
se koriste u primjerima proračuna za određivanje dinamičkih tlakova na dnu hipotetske
bušotine, pretpostavlja se uvjet konstantnog protoka nafte. Zatim se u odabranim vremenima
određuje stanje protoka, koje prema rješenjima jednadžbe difuzije može biti prijelazno, koje
odgovara stanju u neograničenom hipotetskom ležištu, te polustacionarno ili stacionarno,
koja odgovaraju ograničenim ležištima. Temeljem navedenog i s pomoću ulaznih parametara
određuju se proizvodne mogućnosti bušotine, do pojave dvofaznog protoka fluida u ležištu,
odnosno do trenutka kada je tlak u ležištu pao do tlaka zasićenja
Accidents in oil and gas pipeline transportation systems : master's thesis
No full textDiplomski rad analizira akcidente u cjevovodnim sustavima transporta nafte i plina. Daje pregled razvoja cjevovodnih sustava od prvih komercijalnih naftovoda u SAD-u do modernih infrastrukturnih projekata, s naglaskom na povećanje učinkovitosti i sigurnosti transporta. Kroz istraživanje povijesnih podataka o akcidentima prikupljenih iz različitih baza podataka, identificiraju se ključni uzroci akcidenta i prikazuju trendovi u njihovoj pojavnosti. Rad se usredotočuje na razumijevanje faktora poput korozije, utjecaja trećih strana i prirodnih katastrofa koji mogu uzrokovati akcidente, kao i na tehničke i regulatorne mjere prevencije. Analiza obuhvaća suvremene tehnologije detekcije i mitigacije, kao i sigurnosne standarde primjenjive na europskoj i globalnoj razini. Usporedba različitih baza podataka o akcidentima pomaže u formuliranju preporuka za poboljšanje postojećih procedura u upravljanju rizicima i održavanju integriteta cjevovodnih sustava. Zaključci ukazuju na značaj stalnog unaprijeđenja tehnologija i regulativa kako bi se smanjili rizici i ekološki utjecaji vezani uz transport nafte i plina cjevovodima.The thesis analyses accidents in oil and gas pipeline transportation systems. It provides an overview of the development of pipeline systems from the first commercial oil pipelines in the USA to modern infrastructure projects, with a focus on increasing efficiency and transportation safety. By analysing historical accident data from various databases, the main causes of accidents are identified and trends in accident frequency are shown. The work focuses on understanding factors such as corrosion, third party interference, and natural disasters that can cause accidents, as well as technical and regulatory preventive measures. The analysis includes modern detection and mitigation technologies as well as the safety standards applicable at European and global level. A comparison of different accident databases helps to formulate recommendations for improving existing risk management procedures and maintaining the integrity of pipeline systems. The conclusions emphasise the importance of the continuous development of technologies and regulations to reduce the risks and environmental impacts associated with oil and gas pipeline transport
Accidents in oil and gas pipeline transportation systems : master's thesis
No full textDiplomski rad analizira akcidente u cjevovodnim sustavima transporta nafte i plina. Daje pregled razvoja cjevovodnih sustava od prvih komercijalnih naftovoda u SAD-u do modernih infrastrukturnih projekata, s naglaskom na povećanje učinkovitosti i sigurnosti transporta. Kroz istraživanje povijesnih podataka o akcidentima prikupljenih iz različitih baza podataka, identificiraju se ključni uzroci akcidenta i prikazuju trendovi u njihovoj pojavnosti. Rad se usredotočuje na razumijevanje faktora poput korozije, utjecaja trećih strana i prirodnih katastrofa koji mogu uzrokovati akcidente, kao i na tehničke i regulatorne mjere prevencije. Analiza obuhvaća suvremene tehnologije detekcije i mitigacije, kao i sigurnosne standarde primjenjive na europskoj i globalnoj razini. Usporedba različitih baza podataka o akcidentima pomaže u formuliranju preporuka za poboljšanje postojećih procedura u upravljanju rizicima i održavanju integriteta cjevovodnih sustava. Zaključci ukazuju na značaj stalnog unaprijeđenja tehnologija i regulativa kako bi se smanjili rizici i ekološki utjecaji vezani uz transport nafte i plina cjevovodima.The thesis analyses accidents in oil and gas pipeline transportation systems. It provides an overview of the development of pipeline systems from the first commercial oil pipelines in the USA to modern infrastructure projects, with a focus on increasing efficiency and transportation safety. By analysing historical accident data from various databases, the main causes of accidents are identified and trends in accident frequency are shown. The work focuses on understanding factors such as corrosion, third party interference, and natural disasters that can cause accidents, as well as technical and regulatory preventive measures. The analysis includes modern detection and mitigation technologies as well as the safety standards applicable at European and global level. A comparison of different accident databases helps to formulate recommendations for improving existing risk management procedures and maintaining the integrity of pipeline systems. The conclusions emphasise the importance of the continuous development of technologies and regulations to reduce the risks and environmental impacts associated with oil and gas pipeline transport
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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