2,453 Works

Fleet based schedule optimisation for product tanker considering shipʼs stability

Anisa Rizvanolli, Alexander Haupt, Peter Marvin Müller & Jorin Dornemann

Aufgabenkonzepte für eine bessere Qualität von E-Prüfungen

Dennis Gallaun, Karsten Kruse & Christian Seifert
E-Assessment kann den Prüfungs- und Korrekturaufwand für die Lehrenden drastisch reduzieren. Es sollte aber auch dazu genutzt werden didaktisch anspruchsvolle Aufga-ben zu entwickeln. Im Rahmen von verschiedenen elektronischen Prüfungen in der Mathematik an der Technischen Universität Hamburg schreiben wir adaptive elektroni-sche Aufgaben mit automatischer Korrektur, und auf diesem Poster werden wir Aufga-benkonzepte vorstellen, mit denen sich die Qualität von Prüfungen verbessern lässt. Um insbesondere in großen Gruppen den Trainingsprozess für jede Studierende indivi-duell fair zu...

Modeling of the German National Standard for High Pressure Natural Gas Flow Metering in Modelica

Michael von der Heyde, Gerhard Schmitz & Bodo Mickan

Investigation of the pressure drop in refrigerant pipes of an R744 automotive air conditioning system

Christoph Subei & Gerhard Schmitz

Three-fluid heat exchanger as evaporator in multi-source heat pumps with viable options for alternative defrosting methods

Thore Oltersdorf, Gerhard Schmitz & Hans-Martin Henning

Dynamics of postcombustion CO2 capture plants : modeling, validation, and case study

Adam van de Haar, Carsten Trapp, Kai Wellner, Rrobert de Kler, Gerhard Schmitz & Piero Colonna

Optimizing the start-up process of post-combustion capture plants by varying the solvent flow rate

Thomas Marx-Schubach & Gerhard Schmitz

Bewertung von Power-to-Gas-Anlagen mittels dynamischer Systemsimulation

Lisa Andresen & Gerhard Schmitz

Improved bounds for minimal feedback vertex sets in tournaments

Matthias Mnich & Eva Lotta Teutrine
We study feedback vertex sets (FVS) in tournaments, which are orientations of complete graphs. As our main result, we show that any tournament on n nodes has at most 1.5949n minimal FVS. This significantly improves the previously best upper bound of 1.6667^n by Fomin et al. [STOC 2016] and 1.6740^n by Gaspers and Mnich [J. Graph Theory 72(1):72–89, 2013]. Our new upper bound almost matches the best-known lower bound of 21^n/7≈1.5448^n, due to Gaspers and...

Ein Ansatz zur nachvollziehbaren Verifikation medizinisch-cyber-physikalischer Systeme

Julia Padberg, Alexander Schlaefer & Sibylle Schupp

Laser scored machining of fiber reinforced plastics to prevent delamination

Wolfgang Hintze, Marcel Cordes, Tobias Geis, Melchior Frieder Blühm, Claus Emmelmann & Marten Canisius

Influence of excess power utilization in power-to-heat units on an integrated energy system with 100 % renewables

Carsten Bode & Gerhard Schmitz

Linear kernels and linear-time algorithms for finding large cuts

Michael Etscheid & Matthias Mnich

Linear kernels and linear-time algorithms for finding large cuts

Michael Etscheid & Matthias Mnich

Review on the Production of Polysaccharide Aerogel Particles

Kathirvel Ganesan, Tatiana Budtova, Lorenz Ratke, Pavel Gurikov, Victor Baudron, Imke Preibisch, Philipp Niemeyer, Irina Smirnova & Barbara Milow
A detailed study of the production of polysaccharide aerogel (bio-aerogel) particles from lab to pilot scale is surveyed in this article. An introduction to various droplets techniques available in the market is given and compared with the lab scale production of droplets using pipettes and syringes. An overview of the mechanisms of gelation of polysaccharide solutions together with non-solvent induced phase separation option is then discussed in the view of making wet particles. The main...

Non-conventional methods for gelation of alginate

Pavel Gurikov & Irina Smirnova
This review presents and critically evaluates recent advances in non-conventional gelation method of native alginate. A special focus is given to the following three methods: cryotropic gelation, non-solvent induced phase separation and carbon dioxide induced gelation. A few other gelation approaches are also briefly reviewed. Results are discussed in the context of subsequent freeze and supercritical drying. The methods are selected so as to provide the readers with a range of novel tools and tactics...

Polysaccharide-based aerogel bead production via jet cutting method

Imke Preibisch, Philipp Niemeyer, Yusuf Yusufoğlu, Pavel Gurikov, Barbara Milow & Irina Smirnova
The aim of this work is to develop a method to produce spherical biopolymer-based aerogel particles, which is capable for scale-up in the future. Therefore, the jet cutting method is suggested. Amidated pectin, sodium alginate, and chitosan are used as a precursor (a 1–3 wt. % solution) for particle production via jet cutting. Gelation is realized via two methods: the internal setting method (using calcium carbonate particles as cross-linkers and citric and acidic acid for...

Primary hip replacement stem taper fracture due to corrosion in 3 patients

Michael Morlock, Dennis Bünte, Harmen Ettema, Cees C. Verheyen, Åke Hamberg & Jeremy Gilbert

Flexible and automated production of sandwich panels for aircraft interior

Henrik Eschen, Martin Harnisch & Thorsten Schüppstuhl

Helical milling of bore holes in Ti6Al4V parts produced by selective laser melting with simultaneous support structure removal

Wolfgang Hintze, Robert Schötz, Jan Philipp Mehnen, Lars Köttner & Carsten Möller

Automated selection and assembly of sets of blades for jet engine compressors and turbines

Maik Dammann & Thorsten Schüppstuhl

Development and validation of a procedure for numerical vibration analysis of an oscillating wave surge converter

Pál Schmitt, Christian Windt, Jonathan Nicholson & Björn Elsäßer
During extreme sea states so called impact events can be observed on the wave energy converter Oyster. In small scale experimental tests these impact events cause high frequency signals in the measured load which decrease confidence in the data obtained. These loads depend on the structural dynamics of the model. Amplification of the loads can occur and is transferred through the structure from the point of impact to the load cell located in the foundation....

Self-assembly of liquid crystals in nanoporous solids for adaptive photonic metamaterials

Kathrin Sentker, Arda Yildirim, Milena Lippmann, Arne Zantop, Florian Bertram, Tommy Hofmann, Oliver H. Seeck, Andriy V. Kityk, Marco G. Mazza, Andreas Schönhals & Patrick Huber

Elasticity of cross-linked titania nanocrystal assemblies probed by AFM-bulge tests

Andreas Hensel, Clemens Jasper Schröter, Hendrik Schlicke, Norbert Schulz, Svenja Riekeberg, Hoc Khiem Trieu, Andreas Stierle, Heshmat Noei, Horst Weller & Tobias Vossmeyer
In order to enable advanced technological applications of nanocrystal composites, e.g., as functional coatings and layers in flexible optics and electronics, it is necessary to understand and control their mechanical properties. The objective of this study was to show how the elasticity of such composites depends on the nanocrystals’ dimensionality. To this end, thin films of titania nanodots (TNDs; diameter: ~3–7 nm), nanorods (TNRs; diameter: ~3.4 nm; length: ~29 nm), and nanoplates (TNPs; thickness: ~6...

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