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See detailNumerische Untersuchung zur Strömungsentwicklung im passiven Flutsystem des Reaktordesigns Kerena
Kaczmarkiewicz, Nadine UL

Doctoral thesis (2019)

In case of a loss-of-coolant accident in a nuclear power plant, the passive gravity-driven core flooding system recovers the reactor’s water inventory so that the core is covered at all times. It is ... [more ▼]

In case of a loss-of-coolant accident in a nuclear power plant, the passive gravity-driven core flooding system recovers the reactor’s water inventory so that the core is covered at all times. It is essential to estimate, when passive flooding valves open, whether reverse flow occurs and to which extent this may delay flooding or even lead to initial mass displacement from the reactor to the flooding pools. Experimental investigations including passive safety systems of the KERENA-design are performed in a scaled-down facility. Such so-called integral tests are carried out with initial and boundary conditions of different design basis accidents. The behavior of the passive core flooding system is analyzed proofing the influence through other passive safety systems. Evidence is shown that a stable two-phase reverse flow occurs, due to incomplete condensation at the outlet of the emergency condenser and to adiabatic evaporation in the flooding line. The hydrostatic column is reduced during reverse flow but regained in all considered cases. As a result the onset of flooding is delayed only moderately. The influence on the flow development of the containment pressure, of the geometry of the flooding line, and of other peculiar boundary conditions of the considered experiments is discussed. Results from numerical simulations are presented and confirm the experimental results. The considered numerical model of the flooding system can predict fundamental phenomena governing the flow development in the flooding line with satisfactory accuracy. [less ▲]

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See detailNumerische Untersuchungen der instationären Strömungstopologie im Nachlauf einer Seehundvibrisse
Witte, Matthias; Michael, Mark UL; Brede, Martin et al

in Ruck, B.; Leder, A.; Dopheide, D. (Eds.) Proceedings der 16.GALA-Fachtagung “Lasermethoden in der Strömungsmesstechnik“ (2008)

Im Rahmen des Schwerpunktprogramms 1207 „Strömungen in Natur und Technik“ wird die Umströmung einer Seehundvibrisse untersucht. Die Vibrissen von Seehunden zeichnen sich durch eine komplizierte ... [more ▼]

Im Rahmen des Schwerpunktprogramms 1207 „Strömungen in Natur und Technik“ wird die Umströmung einer Seehundvibrisse untersucht. Die Vibrissen von Seehunden zeichnen sich durch eine komplizierte dreidimensionale Strukturmodellierung aus. Sie versetzen den See- hund in die Lage, Nachlaufspuren von Beutefischen zu detektieren. Mit Hilfe Stereo- μ Piv Messungen an Seehundvibrissen konnte die stationäre Strömungstopologie des Vibrissen- nachlaufes ermittelt werden. Zum besseren Verständnis der Funktion der Strukturierung der Vibrisse ist es notwendig, die instationäre Strömungstopologie zu kennen. Durch räumlich und zeitlich hochauflösende numerische Verfahren soll die instationäre Strömungstopologie im Nachlauf einer Seehundvibrisse ermittelt werden. [less ▲]

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See detailNumériser les regards portés sur les oeuvres. Un enjeu épistémologique pour l’histoire de l’art ?
Blanc, Mathias UL

in Histoire de l'Art (2021), (87), -

Numériser les regards présente un enjeu technologique mais renvoie à une problématique classique. Les liens entre style pictural, processus cognitifs et contextes socio-culturels interrogent par ... [more ▼]

Numériser les regards présente un enjeu technologique mais renvoie à une problématique classique. Les liens entre style pictural, processus cognitifs et contextes socio-culturels interrogent par excellence l’histoire de l’art, les sciences cognitives et la sociologie. Toutefois, les cultures épistémiques de chaque discipline diffèrent, peuvent échanger mais aussi s’ignorer, voire s’opposer. La question de la numérisation des regards n’y déroge pas. Cet article met en perspective les méthodes oculométriques, présente l’approche complémentaire du tracé d’annotation et invite à un dialogue soutenu avec l’histoire de l’art. Une étude menée au musée du Louvre-Lens face aux peintures des frères Le Nain vient illustrer le propos. [less ▲]

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See detailLa nuova disciplina del lavoro a progetto
Razzolini, Orsola UL

in Persiani, Mattia (Ed.) Il nuovo diritto del mercato del lavoro (2013)

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See detailNuove prospettive storiografiche di ricerca comparata e transnazionale
Chiocchetti, Paolo UL

in Archivio Trentino (2012), (2), 249-267

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See detailNuove serie e nuovi eroi. Evoluzioni di genere ne l'Ispettore Coliandro, Dexter e Breaking Bad
Treleani, Matteo UL; Travagliati, Greta

in Ocula (2010), 11

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See detailNuovo DRM Paradiso: Designing a Secure, Verified, Fair Exchange DRM Scheme
Torabi Dashti, Mohammad; Krishnan Nair, Srijith; Jonker, Hugo UL

in Fundamenta Informaticae (2008), 89(4), 393-417

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See detailNuovo DRM Paradiso: Towards a Verified Fair DRM Scheme
Dashti, Muhammad Torabi; Nair, Srijith Krishnan; Jonker, Hugo UL

in Proc. First International Symposium on Fundamentals of Software Engineering (FSEN'07) (2007)

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See detailIl nuovo millennio e la teoria del cambiamento storico di Alan Milward: crisi o “grande mutazione”?
Leboutte, René UL; Tedeschi, Paolo

in Memoria e Ricerca : Rivista di Storia Contemporanea (2012)

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See detailIl nuovo pilastro europeo per i diritti sociali: insidie e opportunità
Ratti, Luca UL

Presentation (2016, December 20)

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See detailNur Trainingsweltmeister?
Steffgen, Georges UL

Article for general public (1990)

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See detailNURBS-based finite element analysis of functionally graded plates: Static bending, vibration, buckling and flutter
Bui, Tinh Quoc; Rabczuk, Timon; González-Estrada, Octavio Andrés et al

in Composite Structures (2013), 99

In this paper, a non-uniform rational B-spline based iso-geometric finite element method is used to study the static and dynamic characteristics of functionally graded material (FGM) plates. The material ... [more ▼]

In this paper, a non-uniform rational B-spline based iso-geometric finite element method is used to study the static and dynamic characteristics of functionally graded material (FGM) plates. The material properties are assumed to be graded only in the thickness direction and the effective properties are computed either using the rule of mixtures or by Mori-Tanaka homogenization scheme. The plate kinematics is based on the first order shear deformation plate theory (FSDT). The shear correction factors are evaluated employing the energy equivalence principle and a simple modification to the shear correction factor is presented to alleviate shear locking. Static bending, mechanical and thermal buckling, linear free flexural vibration and supersonic flutter analysis of FGM plates are numerically studied. The accuracy of the present formulation is validated against available three-dimensional solutions. A detailed numerical study is carried out to examine the influence of the gradient index, the plate aspect ratio and the plate thickness on the global response of functionally graded material plates. © 2012 Elsevier Ltd. [less ▲]

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See detailNurr1:RXRα heterodimer activation as monotherapy for Parkinson’s disease
Spathis, Athanasios; Asvos, Xenophon; Ziavra, Despina et al

in Proceedings of the National Academy of Sciences of the United States of America (2017)

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See detailNutrition and the 2020 Pandemic
Stover, Patrick; Balling, Rudolf UL

in Annual Review Of Nutrition (2020)

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See detailNutritional profiles in a public health perspective: a critical review
Foltran, Francesca; Verduci, Elvira; Ghidina, Marco et al

in Journal of International Medical Research (The) (2010), 38(2), 318-385

Nutritional profiling is defined as ‘the science of categorizing foods according to their nutritional composition’ and it is useful for food labelling and regulation of health claims. The evidence for the ... [more ▼]

Nutritional profiling is defined as ‘the science of categorizing foods according to their nutritional composition’ and it is useful for food labelling and regulation of health claims. The evidence for the link between nutrients and health outcomes was reviewed. A reduced salt intake reduces blood pressure, but only a few randomized controlled trials have verified the effect of salt on overall and cardiovascular mortality. Evidence linking a reduced fat intake with cardiovascular mortality and obesity is generally nonsignificant. Studies that have examined the relationship between obesity and diet have produced contrasting results. A simulation exercise that demonstrated that the impact of a reduced salt and fat intake on overall mortality would be negligible in the European population was carried out. Consideration of the literature and the results of this simulation exercise suggest that the introduction of nutritional profiles in Europe would be expected to have a very limited impact on health outcomes. [less ▲]

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See detailA nutritious field trip
Siry, Christina UL; Famiglietti, Jillian

in Journal of Nutrition Education and Behavior (2007), 39(3), 175-177

A class trip to the local grocery store is an engaging way to reinforce a unit on nutrition as students make connections between a real-life experience and their classroom learning. Research shows that ... [more ▼]

A class trip to the local grocery store is an engaging way to reinforce a unit on nutrition as students make connections between a real-life experience and their classroom learning. Research shows that students often remember a field trip well into adulthood and even recall specific exhibits and facts.1 and 2 Field trips generally bring to mind a trip to a museum, zoo, or nature center, but a field trip to a grocery store provides an opportunity for students to demonstrate their understanding of nutrition science and food choices. Research has shown that nutrition education programs can effectively improve the dietary behavior of children.3 and 4 Nutrition education in students’ elementary school experiences should focus on lessons that teach about the importance of choosing healthful food. This field trip can be connected to a unit in which students learn about food groups and ultimately work together to create a list of nutritious and healthful meal choices. It has been written for grade 3, but it can be adapted to meet the needs of older students. [less ▲]

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See detailDer Nutzen einer Komplexen Problemlösekompetenz: Theoretische Überlegungen und empirische Befunde
Greiff, Samuel UL; Fischer, Andreas

in Zeitschrift für Pädagogische Psychologie (2013), 27

Seit Jahrzehnten wird diskutiert ob Komplexes Problemlösen (KPL) ausschließlich von Intelligenz und Vorwissen abhängt, oder ob das systematische Generieren von Informationen, die viable Repräsentation der ... [more ▼]

Seit Jahrzehnten wird diskutiert ob Komplexes Problemlösen (KPL) ausschließlich von Intelligenz und Vorwissen abhängt, oder ob das systematische Generieren von Informationen, die viable Repräsentation der wesentlichen kausalen Zusammenhänge, sowie die zielführende Anwendung von Wissen operative Aspekte von Intelligenz erfordern, die von herkömmlichen Intelligenztests nur unzureichend erfasst werden. Der Klärung dieser Frage stehen bisher messtheoretische Probleme und eine unklare Abgrenzung von KPL zu Vorwissen und Fluider Intelligenz gegenüber. In dieser Arbeit wird daher ein Verfahren zur Messung von KPL-Kompetenz eingeführt, das auf der Verwendung multipler vorwissensneutraler komplexer Probleme basiert. Dieses Verfahren (MicroDYN) wird empirisch an einer studentischen Stichprobe (n = 140) überprüft: Latente Zusammenhänge zu Fluider Intelligenz liegen im Bereich um .50 und bestätigen die empirische Trennbarkeit der Konstrukte. KPL weist inkrementelle Validität gegenüber Fluider Intelligenz bei der Vorhersage von Schulnoten auf, insbesondere für das Gesamtabitur und für naturwissenschaftliche Fächer. Implikationen für den Nutzen von KPL in der Leistungsdiagnostik werden diskutiert. [less ▲]

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See detailDer Nutzen von Orthographie im Französisch-Anfangsunterricht.
Weth, Constanze UL

in Französisch Heute (2011), 3

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See detailNutzung und Auswertung der Fragebogen-Sondervarianten: Jura
Kmiotek-Meier, Emilia Alicja UL; Schmidt, Julia

Presentation (2015)

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