975 research outputs found
Avec la collaboration de Pierre Gaxotte, le Docteur Den Hollander, Roger Hutter, Gabriel Rami, Albert Barbant, Jean Walter. ― L'Année Ferroviaire 1960.
No full textVeyret-Verner Germaine. Avec la collaboration de Pierre Gaxotte, le Docteur Den Hollander, Roger Hutter, Gabriel Rami, Albert Barbant, Jean Walter. ― L'Année Ferroviaire 1960.. In: Revue de géographie alpine, tome 48, n°4, 1960. pp. 724-726
Correction: "Density Functional Theory and Experimental Determination of Band Gaps and Lattice Parameters in Kesterite Cu2ZnSn(SxSe1-x)(4)" (vol 11, pg 10463, 2020)
No full textThe authors regret that one of their coauthors, Oliver S. Hutter, was omitted from the original publication due to an oversight. Dr. Hutter was responsible for performing a large part of the experiments on bulk crystalline materials. The authors therefore take this opportunity to include Dr. Hutter on the author list and extend their apologies to him for the earlier oversight
Managing food safety and hygiene: governance and regulation as risk management
No full textFood safety and hygiene is of critical importance to us all. In this wide ranging book, Bridget Hutter explores how we are all dependent on others to ensure that the food we consume from food in the retailing and hospitality sectors is safe. This has prompted a governance system embracing state regulation and groups beyond the state such as consumers, insurance, media and businesses themselves. The book argues that state regulation is ‘necessary but not sufficient’ as an influence on business risk management practices. Using research data from the UK, the author examines the relative importance of these other groups, in relation to each other and in relation to state regulation
In search of authenticity and personality : Nietzsche on the purifications of philosophy
No full textThroughout Nierzsche's writings we find discussion of various human maladies and sicknesses, such as the historical malady and decadence, along with various conceptions of a possible cure or therapy. In this essay I argue that Nietzsche's conception of philosophy's therapeutic role centres on the protection and promotion of authenticity and explore his preoccupation with authentic existence in each one of his three main intellectual periods. After an opening section on therapeia and paideia in Nietzsche, I focus first on writings from his early period, notably the untimelies on history and Schopenhauer; in the next main section I select Dawn from the middle period as a text that highlights Nietzsche's continued preoccupation with authenticity; and in the final main section I focus on the late Nietzsche and note the continuities in his lifelong project of self-cultivation and emphasis on the goals of culture
A new model of Saint Venant and Savage–Hutter type for gravity driven shallow water flows
No full textRevealing the Fate of Photo-Generated Charges in Metal Halide Perovskites
No full textIn this thesis, we have investigated the optoelectronic properties of metal halide perovskites with a special focus on their application in solar cells. In less than a decade of development, metal halide perovskites have yielded solar cells with efficiencies comparable to commercialized technologies. However, there has been limited knowledge about the fundamental properties of these materials. As mentioned in the introduction, the efficiency of perovskite-based solar cells is still not at its theoretical limit. In order to rationally design solar cells with maximized efficiencies, we need to understand which factors are currently limiting the performance of perovskite-based solar cells. In general, one of the first important processes in a solar cell is the absorption of light. For metal halide perovskites based on lead iodide, a thickness of 0.3 micrometer is already sufficient to absorb a substantial amount of visible (sun-)light, which makes these materials very suitable for solar cells. Furthermore, it is crucial that this absorbed light is converted into a current of moving charges, also known as electricity. Semiconductor materials such as silicon or metal halide perovskites have the ideal properties to generate a current of charges from light. In order to use this current however, the charges need to be collected. The efficiency with which charges are collected in a solar cell is closely related to its power conversion efficiency.ChemE/Opto-electronic Material
Buchbesprechungen
No full textJens Kastner: Die ästhetische Disposition. Eine Einführung in die Kunsttheorie Pierre Bourdieus, Wien: Turia & Kant 2009. (Gregor Bongaerts)Christian Hartard: Kunstautonomien. Luhmann und Bourdieu. München: Verlag Silke Schreiber 2010. (Pascal Geißler)Dagmar Danko: Kunstsoziologie, Bielefeld: Transcript Verlag 2012. (Michael Hutter)Walther Müller-Jentsch: Die Kunst in der Gesellschaft, Wiesbaden: VS 2011. (Amalia Barboza)André Ducret (Hg.): A quoi servent les artistes? Zürich: Seismo 2011. (Denis Hänzi)Florian Schumacher: Bourdieus Kunstsoziologie, Konstanz: UVK 2011 (Christian Steuerwald
Contact-implicit trajectory optimization for dynamic object manipulation
No full textLAUREA MAGISTRALEIn molti problemi di pianificazione dei robot, in particolare quelli che coinvolgono la locomozione e la manipolazione, si manifestano alcune dinamiche non regolari a causa di eventi di contatto, forze di attrito o impatti. La progettazione di controllori per gestire tali applicazioni, basandosi su metodi diretti classici per l'ottimizzazione della traiettoria (TO), potrebbe essere problematica nel caso in cui il problema di ottimizzazione sia risolto utilizzando un metodo basato sul gradiente. Un modo per incorporare tali fenomeni non regolari all'interno della nostra formulazione TO è attraverso l'approccio di ottimizzazione implicita del contatto (CIO), che, insieme al metodo multifase, è uno schema promettente di ottimizzazione della traiettoria sviluppato per affrontare sistemi con dinamica ibrida. A differenza della sua controparte, il metodo implicito del contatto è in grado di risolvere il problema senza conoscere a priori la successione degli eventi di contatto. In questo lavoro di tesi, si estende una versione precedentemente sviluppata di un approccio CIO che si basa sulla descrizione della dinamica multi-contatto come soluzione del problema di complementarietà lineare (LCP), apportando alcune modifiche per una migliore fattibilità dinamica. Ne risulta un programma matematico con vincoli di complementarità (MPCC), che è stato implementato per risolvere diversi compiti di manipolazione di oggetti dinamici con un robot a 6 gradi di libertà. I risultati sono forniti in termini di visualizzazione dell'output dell'ottimizzazione e di simulazione dell'evoluzione del sistema controllato. Infine, vengono presentati i risultati sperimentali per un compito di manipolazione nel quale il manipolatore spinge un blocco in una posizione desiderata situata al di fuori dell'area di lavoro del robot, tenendo conto di un appropriato modello di attrito a secco.In many robot planning problems, especially those involving locomotion and manipulation, some non-smooth dynamics arise due to contact events, frictional forces, or impacts. Designing optimal controllers to deal with such applications, by relying on classical direct methods for trajectory optimization (TO), could certainly be problematic for the underlying gradient-based optimization solver. One way to incorporate such non-smooth phenomena within our TO formulation is through the contact-implicit optimization (CIO) approach, which along with the multi-phase method, is a prominent trajectory optimization scheme intended to tackle systems with hybrid dynamics. Unlike its counterpart, the contact-implicit method optimizes through contact events, without the need for an a priori definition of a full contact schedule. In this thesis work, a previously developed version of a CIO approach that relies on the description of multi-contact dynamics in terms of a linear complementarity problem (LCP)-solution, accompanied by certain modifications for improved dynamic feasibility, is considered. A resulting mathematical program with complementarity constraints (MPCC) is formulated in order to solve several dynamic object manipulation tasks with a 6-degree of freedom robot. Results are given in terms of a visualization of the optimization's output, and a simulation of the controlled system's evolution. Finally, experimental results are also presented for a manipulation task that involves the manipulator dynamically pushing a block into a desired position that is outside of the robot's workspace, while also taking into account an appropriate dry friction model
A new Savage-Hutter type model for submarine avalanches and generated tsunami
No full textInternational audienceIn this paper, we present a new two-layer model of Savage–Hutter type to study submarine avalanches. A layer composed of fluidized granular material is assumed to flow within an upper layer composed of an inviscid fluid (e.g. water). The model is derived in a system of local coordinates following a non-erodible bottom and takes into account its curvature. We prove that the model verifies an entropy inequality, preserves water at rest for a sediment layer and their solutions can be seen as particular solutions of incompressible Euler equations under hydrostatic assumptions. Buoyancy effects and the centripetal acceleration of the grain movement due to the curvature of the bottom are considered in the definition of the Coulomb term. We propose a two-step Roe type solver to discretize the presented model. It exactly preserves water at rest and no movement of the sediment layer, when its angle is smaller than the angle of repose, and up to second order all stationary solutions. Finally, some numerical tests are performed by simulating submarine and sub-aerial avalanches as well as the generated tsunami
Maasvlakte 2, vanuit historisch perspectief; "Variant met doorgetrokken Hartelkanaal voor zeescheepvaart"
No full textIn deel 2 van het afstudeerwerk is een ontwerp gemaakt voor de uitbreiding van de Rotterdamse haven op basis van twee ontwerpplannen voor havenuitbreiding uit de jaren '70.Hydraulic EngineeringCivil Engineering and Geoscience
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