1,720,954 research outputs found
Environmental status in Årungen studied by Cs-137 dating and sediment analysis of carbon, nitrogen, phosphorus, sulphur, copper, iron, manganese, zinc and lead
No full textOppgavefilen mangler forsideEutrofiering er en sammensatt dynamisk prosess i en innsjø og involverer en rekke kjemiske stoffer. Spesielt fosfor er av avgjørende betydning som vekstbegrensende faktor for alger. Innsjøen er imidlertid påvirket av prosesser relatert til klima og nedbørfelt. Sedimentet i en innsjø vil gjenspeile den historiske utviklingen i innsjøen og aktiviteten i nedbørfeltet.Eutrophication is a complex dynamic process in a lake which involves various chemical components. Especially phosphorus is of importance as a growth limiting factor to alges. The lake composition is influenced by two main factors which are climate condition and catchment area. Therefore the sediment in a lake will reveal the historical changes in the lake and the activities in the catchment area.M-MIN
Modellering av ledningsnett for opplæring i lekkasjesøk ved Nasjonalt senter for vanninfrastruktur
Get PDFLekkasjeandelen ved norske drikkevannsforsyningsnett er høy i forhold til resten av Europa. 29 % lekkasje oppgir Folkehelseinstituttet for 2022 (Steinberg et al., 2023). Det virkelige vanntapet kan være over 40 %, ifølge Norsk Vann (Norsk Vann, 2024). I andre europeiske land kan andelen være det halve. Norge er rikt på ferskvann og kostnadene ved å rense drikkevann sies å være lavere enn kostnadene for å reparere lekkasjer. Lekkasjer kan være en utfordring for helse, miljø og samfunn.
Norge har som mål å «redusere drikkevannslekkasje til under 25 % innen 2033» (Helse- og omsorgsdepartementet & Klima- og miljødepartementet, 2024).
Vann- og avløpsbransjen trenger kostnadseffektive løsninger og kompetanse for å håndtere lekkasjer. Nasjonalt senter for vanninfrastruktur er nylig blitt etablert i nærområdet til Norges miljø-
og biovitenskapelige universitet i Ås. Vannsenteret vil være et kompetanse- og forsøkssenter for bransjen og nasjonale utdanningsinstitusjoner. Senteret har et vannledningsnett for praktisk
opplæring i lekkasjesøk i felt. Hoved- og stikkledninger er utstyrt med lekkasjehull og kraner, som kan åpnes og stenges etter behov.
I denne masteroppgaven er det blitt bygd en skjematisk hydraulisk modell i EPANET 2.2 av vannanlegget ved Nasjonalt senter for vanninfrastruktur som supplement til opplæringsvirksomheten. I EPANET ble emittere benyttet for lekkasjehullene på trykkledninger i lekkasjesøksfeltet. Disse emitterne er kalibrert ved bruk av data fra tappetester. Modellen kan
beregne hva som lekker i lekkasjehullene ved ulike trykk.
Videre steg kan være å validere modellen, det vil si å teste modellen på nye måledata i en annen driftssituasjon, og i tillegg vurdere hva modellen kan brukes til.Pipe network leakage at water distribution systems in Norway was about 29 % in 2022, reported by the Norwegian Institute of Public Health. The real loss of water might be more than 40 %, the double of other european couentries. In Norway, there are a lot of freshwater lakes and the costs to clean drinking water is considered to be lower than leakage costs. Leakage is a challenge to health, environment and community. Norwegian aims is to reduce drinking water leakage to less than 25 %
during 2033.
The water and sewage industry needs cost efficient solutions and leakage competence. The National center for water infrastructure is recently established close to the Norwegian University og Life Sciences in Ås. The center of water is supposed to be a meeting place for teaching and practising leak localization at a water pipe network at field. Pipes in the network have leakage holes and cranes to open or close.
The work in this master thesis has focused on building a schematic hydraulic model in EPANET 2.2 of the pipe network at The National center for water infrastructure, and is ment to supplement the teaching activity. In the EPANET model emitters were used for leakage holes on pressure pipes at the leak localization area. These emitters are calibrated by use of leakage tests. The model calculate the leakage from the holes at different pressures.
Work to be continued is the validation of the EPANET model, that means testing the model with new data in another situation, and to evaluate the use of the model
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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