186,430 research outputs found
Reker i Indre Oslofjord - overvåking i perioden 2000-2014
No full textHer presenteres resultatene av undersøkelser av forekomst av reker på 7 stasjoner i Indre Oslofjord og Drøbaksundet over en periode på 15 år. I alt ble det observert 15 ulike rekearter. Den mest hyppig observerte arten var Pandalina profunda etterfulgt av Crangon allmanni og dypvannsreken Pandalus borealis. Antall rekearter økte utover i fjorden. Ved oksygenkonsentrasjoner under 1 ml/l vil det normalt ikke forekomme reker. Ved oksygenkonsentrasjoner mellom 1-2 ml/l kan det forekomme noe reker, mens en må opp i konsentrasjoner på ca. 2,5-3 ml/l før en kan oppnå relativt høye individ- og artsantall. Dypvannsreken ble tidlig i forrige århundre fanget kommersielt i Bunnefjorden. På stasjonene i Bunnefjorden ble det i perioden 2000-2014 ikke registrert dypvannsreker. Sett over hele perioden 2000- 2014 ble den største forekomsten av dypvannreken observert i Gråøyrenna. Skal en få tilbake det rekefisket som engang var i Bunnefjorden, må oksygensituasjonen forbedres. Kartlegging av forekomster av reker har et potensial for bredere bruk ved overvåking av fjorder.Title: Shrimps in the Inner Oslo fjord – monitoring during the period 2000-2014. Results of monitoring shrimps at 7 stations in the inner Oslofjord and Drøbak sound over a period of 15 years are presented. The most frequently observed species were Pandalina profunda followed by Crangon allmanni and Pandalus borealis. The number of shrimp species increased from the inner to the outer part of the fjord. Shrimps will normally not occur at oxygen concentrations below 1 ml/l. At oxygen concentrations between 1-2 ml/l, there may be some shrimps, while a concentration of 2.5-3 ml/l is neccesary to achieve high individual and species numbers. P. borealis was caught commercially in Bunnefjorden early last century, but was not observed at all during the period 2000-2014. The oxygen conditions have to be improved in the Bunnefjord in order to reestablish an abundant population of P. borealis. Assessing the presence and abundance of shrimps has the potential for wider use in fjord monitoring.publishedVersio
Four flavours of twisted mass fermions
No full textKwantum chromodynamica verder verfijnd Lattice QCD (Lattice Quantum ChromoDynamics) is een tak van theoretische natuurkunde die zich bezig houdt met het berekenen van processen en eigenschappen van deeltjes onder invloed van de sterke kernkracht. Deze berekeningen worden uitgevoerd op supercomputers zoals de IBM Blue Gene/P in het computercentrum van de Rijksuniversiteit Groningen. Siebren Reker onderzocht of bepaalde berekeningen nog zuiverder kunnen worden uitgevoerd. Er zijn verschillende formuleringen van Lattice QCD. Het onderzoek van Reker richt zich op een van die formuleringen: twisted mass Lattice QCD, en werd uitgevoerd in het kader van een Europees samenwerkingsverband met de naam European Twisted Mass Collaboration (ETMC). Het doel van het onderzoek was uitzoeken of kwantum chromodynamica de goede beschrijving is van subatomaire processen onder invloed van sterke kernkracht op lage energie. Meer specifiek heeft het samenwerkingsverband als een van de eerste gekeken naar de invloed van het meenemen van een vierde quark in de berekeningen. Frederik: ‘Uit het onderzoek blijkt dat de invloed van een vierde quark op de processen en eigenschappen die wij bestudeerd hebben bijna niet merkbaar is. Dit was verwacht, maar nog niet eerder expliciet berekend.’ Reker’s dissertatie beschrijft veel van de technische details die nodig zijn om tot een zuivere berekening van deze processen en eigenschappen te komen. Ook een techniek om efficiënt grote databestanden weg te schrijven maakte onderdeel uit van het onderzoek. Het laatste hoofdstuk staat enigszins los en is het resultaat van een samenwerking (gericht op numerieke aspecten) met een groep chemici
Qualitätssicherung von Projekten zur Gesundheitsförderung in Settings
No full textTempel N, Bödeker M, Reker N, Schaefer I, Klärs G, Kolip P. Qualitätssicherung von Projekten zur Gesundheitsförderung in Settings. Köln: Bundeszentrale für gesundheitliche Aufklärung; 2013
Author-wise bibliometric analysis based on entropy.
No full textAuthor-wise bibliometric analysis based on entropy.</p
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
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
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
Dr. Edward P. Wimberly, ITC, July 2011
No full textThis video is a conversation with Dr. Edward P. Wimberly. Dr. Wimberly talks about his book, "No Shame in Wesley's Gospel: A Twenty-First Century Pastoral Gospel". Brad Ost, AUC Woodruff Library, is the interviewer
Author Rights and Scholarly Publishing
No full textOriginally posted at
http://blog.library.gsu.edu/2014/10/24/author-rights-and-scholarly-publishing/</p
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