1,720,959 research outputs found
Forced Migration - environmental and socioeconomic dimensions
Full text linkIn 2009, five German higher education institutions – Technical University Braunschweig, University of Hohenheim, University of Kassel, Cologne University of Applied Sciences and Ludwig-Maximilians-University München – were selected to be part of the Excellence for Development Cooperation (Exceed) Program by the German Academic Exchange Service (DAAD) and the German Federal Ministry for Economic Cooperation and Development (BMZ). Since then, these centers together with their 37 partners in developing countries, have been establishing think tanks to contribute to the post-2015 development agenda. These five Exceed Centers combined forces to take a closer look at the environmental and socioeconomic dimensions of forced migration together with scientists, politicians and the public from around the world by participating in the first Exceed Conference in Berlin. This up-to-date topic was chosen to strengthen the connection between local research on conflicts and their consequences in today's world and global action towards the mitigation of these consequences. During the course of the conference, current research results were presented, challenges were discussed and new strategies to prevent forced migration were identified by using an interactive conference set-u
Sequenzielle Co-Simulation zur Kopplung von CFD und biologischem Wachstum in einem Hefereaktor
Full text linkCoupling of multiphase fluid dynamics and biological growth is a common area of application in process engineering. At the forefront, environmental conditions and rising energy cost force companies to optimize reactor systems and processes. In optimization problems virtual methods play a major role. Models form the basis of virtual methods.
Differences in time scales for computational fluid dynamics and biological growth make direct co-simulation infeasible. A sequential method has to be applied. This work proposes the sequential co-simulation in application to baker's yeast production in a 200 L bubble column reactor.
The method combines a module for fluid dynamics implemented in CFX by Ansys and a module for biological growth implemented in Matlab and Simulink by Mathworks. Data interfaces are defined for module changes between sequences. Switching from the fluid dynamics module to the growth module data is mapped to a reduced set of elements by the neural gas algorithm. Computational demand for sequences of growth is significantly reduced.
Validation of this method follows two steps. First, computational fluid dynamics are validated with experimental data for axial liquid velocity. Second, growth model and the sequential method are validated with cultivation data. Experimental data has been determined in the same bubble column reactor. Target prediction for the sequential co-simulation deviates less than three percent from measured values.Die Kombination aus Mehrphasenströmung und biologischem Wachstum findet eine weit verbreitete Anwendung in der Prozesstechnik. In erster Linie zwingen anspruchsvolle Auflagen zum Umweltschutz und steigende Energiepreise Unternehmen dazu ihre Anlagen und Prozesse zu optimieren. Virtuelle Methoden sind ein wesentliches Hilfsmittel zur Lösung von Optimierungsproblemen. Modelle stellen die Grundlage für diese Methoden dar.
Derzeit ist eine direkte Co-Simulation aufgrund unterschiedlicher Zeitskalen für die Berechnung von Strömungs- und Wachstumsvorgängen nicht machbar. Alternativ werden sequenzielle Methoden angewandt. In dieser Arbeit wird die sequenzielle Co-Simulation am Beispiel der Backhefeherstellung in einem 200 L Blasensäulenreaktor vorgestellt.
Implementiert ist diese Methode in Form von zwei Modulen. Das Modul für die Strömungssimulation ist in CFX von Ansys umgesetzt. Das Wachstumsmodell ist als Modul in Matlab und Simulink von Mathworks realisiert. Schnittstellen beschreiben die Datenübergabe zwischen den Sequenzen. Bei der Übergabe von CFX an Matlab werden die Daten mithilfe des Neural Gas Algorithmus einem reduzierten Elementsatz zugeordnet. Damit sinkt der Rechenbedarf für Wachstumssequenzen deutlich.
Die sequenzielle Co-Simulation wird in zwei Schritten validiert. Im ersten Schritt dienen Messungen der axialen Komponente der Flüssigkeitsgeschwindigkeit zur Validierung der numerischen Strömungssimulation. Im zweiten Schritt werden experimentell ermittelte Wachstumsdaten mit Ergebnissen des Wachstumsmodells und der sequenziellen Methode abgeglichen. Grundlage der Daten ist immer der gleiche Reaktor. Der mit der sequenziellen Co-Simulation berechnete Zielwert weicht weniger als drei Prozent vom Messwert ab
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
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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