1,721,019 research outputs found
Steel pipeline for the hydrogen storage and delivery: metallurgical viewpoint for Finnish ecosystem
Full text linkAbstract
For more than a century, hydrogen has been used as an industrial chemical to produce ammonia for fertilizers and to process intermediate products in oil refineries. However, hydrogen has recently received renewed interest due to its ability to reduce carbon emissions to the atmosphere, particularly in the steel-making industries. Thus, hydrogen has the potential to play a critical role in combating climate change and achieving Finland's national goal of carbon neutrality by 2035. In this regard, national and global demand for hydrogen is rapidly increasing, and it is now three times more than what it was in 1975. The production and supply of hydrogen for industrial consumption would be a massive business that is expected to expand even faster than before. According to the IEA, the total demand for hydrogen in pure and mixed gas was approximately 115-120 million tones in 2018. (Gaseous) hydrogen can be efficiently transported by pipeline networks at a pressure of typically <100 bar. Pipelines provide an economical means of transporting hydrogen in large quantities over long/short distances, and hence they are often found serving end users who take hydrogen from a local central source of production. Nevertheless, the correct pipe material for hydrogen distribution must be designed and used, and the current natural gas pipeline infrastructure must be upgraded significantly if it is to be used for the delivery of pure hydrogen at high pressure. Hence, new research is needed to focus mainly on the possibility of use/modification of available natural gas pipeline network for hydrogen delivery as well as the study on the new economical pipeline material, exclusively for hydrogen transportation and storage.Abstract
For more than a century, hydrogen has been used as an industrial chemical to produce ammonia for fertilizers and to process intermediate products in oil refineries. However, hydrogen has recently received renewed interest due to its ability to reduce carbon emissions to the atmosphere, particularly in the steel-making industries. Thus, hydrogen has the potential to play a critical role in combating climate change and achieving Finland's national goal of carbon neutrality by 2035. In this regard, national and global demand for hydrogen is rapidly increasing, and it is now three times more than what it was in 1975. The production and supply of hydrogen for industrial consumption would be a massive business that is expected to expand even faster than before. According to the IEA, the total demand for hydrogen in pure and mixed gas was approximately 115-120 million tones in 2018. (Gaseous) hydrogen can be efficiently transported by pipeline networks at a pressure of typically <100 bar. Pipelines provide an economical means of transporting hydrogen in large quantities over long/short distances, and hence they are often found serving end users who take hydrogen from a local central source of production. Nevertheless, the correct pipe material for hydrogen distribution must be designed and used, and the current natural gas pipeline infrastructure must be upgraded significantly if it is to be used for the delivery of pure hydrogen at high pressure. Hence, new research is needed to focus mainly on the possibility of use/modification of available natural gas pipeline network for hydrogen delivery as well as the study on the new economical pipeline material, exclusively for hydrogen transportation and storage
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
Uuden niobimikroseostetun keskihiilisen teräksen suunnittelu, termomekaaninen käsittely ja induktiokarkaisu
No full textAbstractThis thesis has been made within the European Industrial Doctorate (EID) project called Mathematics and Materials Science for Steel Production and Manufacturing, abbreviated as MIMESIS, which has five partners: EFD Induction in Norway; SSAB, Outokumpu, and the University of Oulu in Finland; and Weierstrass Institute for Applied Analysis and Stochastics (WIAS) in Germany. The main aim of this work was to develop a steel composition and processing route suitable for making a slurry transportation pipeline with the aid of induction hardening, and to characterize the phase transformations and microstructures involved in the various stages of the processing route.A novel steel chemistry was designed based on metallurgical principles assisted by computational thermodynamics and kinetics. The designed composition is a medium-carbon, low-alloy steel microalloyed with niobium, in wt.% 0.40 C, 0.20 Si, 0.25 Mn, 0.50 Mo, 0.90 Cr, and 0.012 Nb. This was subsequently cast, thermomechanically rolled on a laboratory rolling mill to two bainitic microstructures, and finally subjected to the thermal cycles predicted to be encountered with the internal induction hardening of a typical pipe geometry. The phase transformations and microstructures found at various stages of the simulated production process have been characterized and algorithms developed to enable the optimization of microstructure and hardness through the pipe wall thickness.Original papersOriginal papers are not included in the electronic version of the dissertation.Javaheri, V., Porter, D., & Kuokkala, V.-T. (2018). Slurry erosion of steel – Review of tests, mechanisms and materials. Wear, 408–409, 248–273. https://doi.org/10.1016/j.wear.2018.05.010Self-archived versionJavaheri, V., Nyyssönen, T., Grande, B., & Porter, D. (2018). Computational design of a novel medium-carbon, low-alloy steel microalloyed with niobium. Materials Engineering and Performance, 27, 2978–2992. https://doi.org/10.1007/s11665-018-3376-9Self-archived versionJavaheri, V., Khodaie, N., Kaijalainen, A., & Porter, D. (2018). Effect of niobium and phase transformation temperature on the microstructure and texture of a novel 0.40% C thermomechanically processed steel. Materials Characterization, 142, 295–308. https://doi.org/10.1016/j.matchar.2018.05.056Self-archived versionJavaheri, V., Kolli, S., Grande, B., & Porter, D. (2019). Insight into the induction hardening behavior of a new 0.40% C microalloyed steel: Effects of initial microstructure and thermal cycles. Materials Characterization, 149, 165–183. https://doi.org/10.1016/j.matchar.2019.01.029Self-archived versionJavaheri, V., Pohjonen, A., Asperheim, J.I., Ivanov, D., & Porter, D. (2019). Physically based modelling, characterization and design of an induction hardening process for a new slurry pipeline steel. Materials and Design, 182, 108047. https://doi.org/10.1016/j.matdes.2019.108047Self-archived versionTiivistelmäTämä väitöskirja on tehty osana Euroopan teollisuustohtori (European Industrial Doctorate, EID) -ohjelmaa projektissa eli Matematiikka ja materiaalitiede teräksen valmistuksessa ja käytössä (Mathematics and Materials Science for Steel Production and Manufacturing, MIMESIS). Ohjelmassa on viisi partneria: EFD Induction Norjasta; SSAB, Outokumpu ja Oulun yliopisto Suomesta; ja Weierstrass Institute for Applied Analysis and Stochastics (WIAS) Saksasta. Työn päätavoitteina oli kehittää teräksen koostumusta ja prosessointireittiä, jotka soveltuvat lietteen kuljetusputken valmistukseen induktiokarkaisun avulla, sekä karakterisoida prosessin eri vaiheiden aikana tapahtuvat faasimuutokset ja mikrorakenteet.Uusi teräskoostumus suunniteltiin metallurgisten periaatteiden pohjalta hyödyntämällä laskennallista termodynamiikkaa ja kinetiikkaa. Suunniteltu teräs on niobilla mikroseostettu, matalaseosteinen ja keskihiilinen, eli painoprosentteina 0,40 C, 0,20 Si, 0,25 Mn, 0,50 Mo, 0,90 Cr ja 0,012 Nb. Teräs valettiin, valssattiin ja jäähdytettiin termomekaanisesti laboratoriovalssaimella kahdeksi bainiittiseksi mikrorakenteeksi ja lopulta altistettiin lämpösykleille, joiden ennustettiin olevan tyypillisiä sisäisesti induktiokarkaistulle teräsputkelle. Simuloidun tuotantoprosessin eri vaiheissa havaitut faasimuutokset ja mikrorakenteet on karakterisoitu. Sen lisäksi on kehitetty algoritmit, jotka mahdollistavat mikrorakenteen ja kovuuden optimoinnin putken seinämän paksuuden läpi.OsajulkaisutOsajulkaisut eivät sisälly väitöskirjan elektroniseen versioon.Javaheri, V., Porter, D., & Kuokkala, V.-T. (2018). Slurry erosion of steel – Review of tests, mechanisms and materials. Wear, 408–409, 248–273. https://doi.org/10.1016/j.wear.2018.05.010Rinnakkaistallennettu versioJavaheri, V., Nyyssönen, T., Grande, B., & Porter, D. (2018). Computational design of a novel medium-carbon, low-alloy steel microalloyed with niobium. Materials Engineering and Performance, 27, 2978–2992. https://doi.org/10.1007/s11665-018-3376-9Rinnakkaistallennettu versioJavaheri, V., Khodaie, N., Kaijalainen, A., & Porter, D. (2018). Effect of niobium and phase transformation temperature on the microstructure and texture of a novel 0.40% C thermomechanically processed steel. Materials Characterization, 142, 295–308. https://doi.org/10.1016/j.matchar.2018.05.056Rinnakkaistallennettu versioJavaheri, V., Kolli, S., Grande, B., & Porter, D. (2019). Insight into the induction hardening behavior of a new 0.40% C microalloyed steel: Effects of initial microstructure and thermal cycles. Materials Characterization, 149, 165–183. https://doi.org/10.1016/j.matchar.2019.01.029Rinnakkaistallennettu versioJavaheri, V., Pohjonen, A., Asperheim, J.I., Ivanov, D., & Porter, D. (2019). Physically based modelling, characterization and design of an induction hardening process for a new slurry pipeline steel. Materials and Design, 182, 108047. https://doi.org/10.1016/j.matdes.2019.108047Rinnakkaistallennettu versioAcademic dissertation to be presented with the assent of the Doctoral Training Committee of Technology and Natural Sciences of the University of Oulu for public defence in the OP auditorium (L10), Linnanmaa, on 1 November 2019, at 12 noonAbstract
This thesis has been made within the European Industrial Doctorate (EID) project called Mathematics and Materials Science for Steel Production and Manufacturing, abbreviated as MIMESIS, which has five partners: EFD Induction in Norway; SSAB, Outokumpu, and the University of Oulu in Finland; and Weierstrass Institute for Applied Analysis and Stochastics (WIAS) in Germany. The main aim of this work was to develop a steel composition and processing route suitable for making a slurry transportation pipeline with the aid of induction hardening, and to characterize the phase transformations and microstructures involved in the various stages of the processing route.
A novel steel chemistry was designed based on metallurgical principles assisted by computational thermodynamics and kinetics. The designed composition is a medium-carbon, low-alloy steel microalloyed with niobium, in wt.% 0.40 C, 0.20 Si, 0.25 Mn, 0.50 Mo, 0.90 Cr, and 0.012 Nb. This was subsequently cast, thermomechanically rolled on a laboratory rolling mill to two bainitic microstructures, and finally subjected to the thermal cycles predicted to be encountered with the internal induction hardening of a typical pipe geometry. The phase transformations and microstructures found at various stages of the simulated production process have been characterized and algorithms developed to enable the optimization of microstructure and hardness through the pipe wall thickness.Tiivistelmä
Tämä väitöskirja on tehty osana Euroopan teollisuustohtori (European Industrial Doctorate, EID) -ohjelmaa projektissa eli Matematiikka ja materiaalitiede teräksen valmistuksessa ja käytössä (Mathematics and Materials Science for Steel Production and Manufacturing, MIMESIS). Ohjelmassa on viisi partneria: EFD Induction Norjasta; SSAB, Outokumpu ja Oulun yliopisto Suomesta; ja Weierstrass Institute for Applied Analysis and Stochastics (WIAS) Saksasta. Työn päätavoitteina oli kehittää teräksen koostumusta ja prosessointireittiä, jotka soveltuvat lietteen kuljetusputken valmistukseen induktiokarkaisun avulla, sekä karakterisoida prosessin eri vaiheiden aikana tapahtuvat faasimuutokset ja mikrorakenteet.
Uusi teräskoostumus suunniteltiin metallurgisten periaatteiden pohjalta hyödyntämällä laskennallista termodynamiikkaa ja kinetiikkaa. Suunniteltu teräs on niobilla mikroseostettu, matalaseosteinen ja keskihiilinen, eli painoprosentteina 0,40 C, 0,20 Si, 0,25 Mn, 0,50 Mo, 0,90 Cr ja 0,012 Nb. Teräs valettiin, valssattiin ja jäähdytettiin termomekaanisesti laboratoriovalssaimella kahdeksi bainiittiseksi mikrorakenteeksi ja lopulta altistettiin lämpösykleille, joiden ennustettiin olevan tyypillisiä sisäisesti induktiokarkaistulle teräsputkelle. Simuloidun tuotantoprosessin eri vaiheissa havaitut faasimuutokset ja mikrorakenteet on karakterisoitu. Sen lisäksi on kehitetty algoritmit, jotka mahdollistavat mikrorakenteen ja kovuuden optimoinnin putken seinämän paksuuden läpi
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
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