60 Works

On the road to biopolymer aerogels - dealing with the solvent

Subrahmanyam Raman, Pavel Gurikov, Paul Dieringer, Miaotian Sun & Irina Smirnova
Aerogels are three-dimensional ultra-light porous structures whose characteristics make them exciting candidates for research, development and commercialization leading to a broad scope of applications ranging from insulation and catalysis to regenerative medicine and pharmaceuticals. Biopolymers have recently entered the aerogel foray. In order to fully realize their potential, progressive strategies dealing with production times and costs reduction must be put in place to facilitate the scale up of aerogel production from lab to commercial scale....

Towards online visualization and interactive monitoring of real-time CFD simulations on commodity hardware

Nils Koliha, Christian F. Janßen & Thomas Rung
Real-time rendering in the realm of computational fluid dynamics (CFD) in particular and scientific high performance computing (HPC) in general is a comparably young field of research, as the complexity of most problems with practical relevance is too high for a real-time numerical simulation. However, recent advances in HPC and the development of very efficient numerical techniques allow running first optimized numerical simulations in or near real-time, which in return requires integrated and optimized visualization...

Characterization of the microstructure evolution in IF-Steel and AA6016 during plane-strain tension and Simple Shear

Gregory Gerstein, Benjamin Klusemann, Swantje Bargmann & Mirko Schaper
In the current work, the evolutions of grain and dislocation microstructures are investigated on the basis of plane strain tension and simple shear tests for an interstitial free steel (DC06) and a 6000 series aluminum alloy (AA6016-T4). Both materials are commonly-used materials in the automobile industry. The focus of this contribution is on the characterization and comparison of the microstructure formation in DC06 and AA6016-T4. Our observations shed light on the active mechanisms at the...

Large-scale parallel alignment of platelet-shaped particles through gravitational sedimentation

Sebastian Behr, Ulla Vainio, Martin Müller, Andreas Schreyer & Gerold A. Schneider
Parallel and concentric alignment of microscopic building blocks into several orders of magnitude larger structures is commonly observed in nature. However, if similarly aligned structures are artificially produced their thickness is generally limited to just about one or two orders of magnitude more than the dimensions of the smallest element. We show that sedimentation provides a promising approach to manufacture solid materials consisting of well-aligned platelet-shaped particles while being more than 30 000 times thicker...

Rissbildung in fugenlosen Kaianlagen - ein Berechnungsmodell für massige Bauteile aus Stahlbeton

Jens Wasner
The thesis contributes to the determination of the effective restraint action in large jointless quays. The focus is on the particular cracking behaviour of the voluminous reinforced concrete superstructures. For this purpose special mechanical models are developed. With those the non-linear material behaviour and bond relation are mapped to reality. After an introduction about the development of container shipping different types of quays with jointless superstructure are presented. Then the material properties of concrete and...

Bioressourceninventur – Analyse von Stoffströmen zur Bestimmung urbaner Biomassepotenziale in einem Geoinformationssystem (GIS)

Helmut Adwiraah
Zur effizienten Nutzung des energetischen und stofflichen Potenzials der im urbanen Raum anfallenden Bioressourcen sind Menge, Entstehungsort und Zusammensetzung von größter Bedeutung. Es werden die spezifischen räumlichen Abhängigkeiten zwischen geographischen Daten und den verwertungsrelevanten Eigenschaften der Bioressourcen untersucht und Berechnungsparameter sowie Einflussfaktoren für die geodatenbasierte Bioressourceninventur in einem GIS bestimmt.

Life cycle assessment of electricity production from airborne wind energy

Stefan Wilhelm
Global energy supply is closely linked with some of the greatest challenges of our society. A rising demand has to be met whereas conventional energy sources are depleting and emit considerable amounts of greenhouse gases. Renewable energy technologies are increasingly promoted to face these issues, especially in the electricity industry. Research has shown, that renewables are superior to conventional energy technologies in many environmental aspects but are not free of burdens. However, the main causes...

RAMIRAN 2015 : 16th International Conference Rural-Urban Symbiosis : proceedings book : 8th-10th September 2015, Hamburg University of Technology, Germany

Ina Körner
Residues originate in rural and in urban systems. Many contain biogenic ingredients, e.g. food and green waste, livestock manure, feces, sewage and other sludge’s, harvest residues, digestates, agro-industry residues, and more. Commonly residues are known to pollute environments, causes hygienic problems or they are cost-intensive to collect and treat. Since fossil raw materials are becoming scarce, biogenic residues are more and more a topic of utilization. Application options are manifold. They range from energetic utilization,...

Indian Companies in Germany - A Report on Investment Activities in 2014-15

Rajnish Tiwari
In the previous fiscal year (April 2014 to March 2015) the level of outward foreign direct investments (FDI) by Indian firms witnessed some moderation. The gross outflow of FDI from India in FY 2014-15 stood at US $8.5 billion as per data released by the Reserve Bank of India. At March-end 2015, the cumulative stock of FDI from India stood at US $130.5 billion, which was only slightly higher from US $128.7 at the end...

Smart Mobility for India: Needs, Opportunities & Challenges

Rajnish Tiwari
India finds itself in a precarious situation. While the lack of efficient and effective mediums of mobility for public-at-large outside metropolitan cities continues to cause loss of productivity and stifle economic growth in a considerable manner; the economic growth in major urban centres and the resultant growth of passenger vehicles and two-wheelers is leading to heavy traffic jams and pollution, again causing loss of productivity and chocking of economic growth. This article argues that a...

USB - an attack surface of emerging importance

Frieder Steinmetz
USB is one of the most widely adopted standards for buses. Little work regarding its security implications has been published. This work provides a brief summary of known issues as well as a documentation of new problems and possible future threats. The discovered issues have been classified and possible solutions have been discussed. During the research a secret channel for data exfiltration, as well as command and control has been designed and implemented. The results...

RAMIRAN 2015 : 16th International Conference Rural-Urban Symbiosis : abstract book : 8th-10th September 2015, Hamburg University of Technology, Germany

Ina Körner
Rückstände stammen aus ländlichen und aus städtischen Systemen. Viele enthalten biogene Bestandteile, z.B. Nahrungs- und Gartenabfälle, Rückstände aus Nutztierhaltungen, Abwasser und andere Schlämme, Ernterückstände, Gärreste, Agro-Industrie Rückstände und mehr. Allgemein ist bekannt, dass diese Rückstände die Umwelt verunreinigen und hygienische Probleme hervorrufen können und dass ihre Einsammlung und Behandlung kostenintensiv ist. Seitdem fossile Rohstoffe knapper werden, sind biogene Rückstände und deren Nutzung mehr und mehr ein Thema. Die Verwendungsmöglichkeiten sind vielfältig. Sie reichen von der...

Die Spannung steigern : Laborpraktika didaktisch gestalten

Zentrum Für Lehre Und Lernen (ZLL), Mirjam Sophia Gleßmer, Sönke Knutzen & Peter Salden
Laboratory classes are an important part of the curriculum in STEM (Science, Technology, Engineering, Mathematics) courses. In laboratory classes students develop an understanding of connections between theory and application in an experimental and research-oriented manner. In this brochure, a team of instructional designers offer suggestions on how to design laboratory courses to maximise student learning. We focus on didactical planning of laboratory classes, considerations when running the laboratory class concerning methods for e.g. group work,...

Friction-based injection clinching joining (F-ICJ): a new joining method for hybrid lightweight structures

André Bastos Abibe
Friction-based Injection Clinching Joining (F-ICJ) is a new advanced staking joining technology for lightweight hybrid structures. This PhD work was devised to understand the fundamental scientific and engineering aspects of F-ICJ. The joint formation mechanisms, process-related changes in the joined materials, and quasi-static mechanical behavior were clarified. This knowledge was used to establish relationships between processing conditions, microstructure, and global joint properties. A proof of concept of the F-ICJ process was explored by optimizing the...

Court rulings as evidence for social engineering research

Ngoc-Minh Michal Pham
This paper is about the question whether court rulings can be used as evidence for Social Engineering research. It goes into the methodology of acquiring and analysing the material and presents the results.

Fatigue Performance of Laser Additive Manufactured Ti–6al–4V in Very High Cycle Fatigue Regime up to 1E9 Cycles

Eric Wycisk, Shafaqat Siddique, Dirk Herzog, Frank Walther & Claus Emmelmann
Additive manufacturing technologies are in the process of establishing themselves as an alternative production technology to conventional manufacturing, such as casting or milling. Especially laser additive manufacturing (LAM) enables the production of metallic parts with mechanical properties comparable to conventionally manufactured components. Due to the high geometrical freedom in LAM, the technology enables the production of ultra-light weight designs, and therefore gains increasing importance in aircraft and space industry. The high quality standards of these...

Jahresbericht 2014 des Präsidiums der Technischen Universität Hamburg-Harburg

Garabed Antranikian & Technische Universität Hamburg-Harburg
Jahresbericht des Präsidiums der TU Hamburg-Harburg 2014

Algebraic Statistics

Karl-Heinz Zimmermann
Algebraic statistics brings together ideas from algebraic geometry, commutative algebra, and combinatorics to address problems in statistics and its applications. Computer algebra provides powerful tools for the study of algorithms and software. However, these tools are rarely prepared to address statistical challenges and therefore new algebraic results need often be developed. This way of interplay between algebra and statistics fertilizes both disciplines. Algebraic statistics is a relatively new branch of mathematics that developed and changed...

Micromechanisms governing plastic instability in Al–Li based alloys

Henry Ovri
The investigation of the underlying microscopic mechanisms that govern plastic in- stability in solution strengthened and precipitation strengthened Al alloys has been the subject of several studies. These studies are largely motivated by the need to devise strategies to mitigate the undesirable effects, such as reduction in ductility and formation of surface striations, which occur in alloys that exhibit this phenomenon. While the microscopic origin of plastic instability in solution strengthened alloys Al alloys is...

Einfluss von Anreizsystemen zur Förderung alternativer Antriebe auf Kaufentscheidungen und Verkehrsverhalten

Christian Rudolph
Die Marktdurchdringung alternativ angetriebener Fahrzeuge schreitet in Deutschland langsamer voran, als von der Bundesregierung erhofft. Das formulierte Ziel von einer Millionen Elektrofahrzeugen auf Deutschlands Straßen bis 2020 scheint nach derzeitigen Entwicklungen nicht erreichbar. Stimmen nach mehr staatlicher Unterstützung zur Beschleunigung der Marktdurchdringung von Elektrofahrzeugen werden lauter. Diese Arbeit untersucht den Einfluss staatlicher Anreizsysteme auf Pkw- Kaufentscheidungen bezüglich der Antriebstechnologie. Hierzu wird ein auswahlbasiertes Stated-Preference-Experiment zu hypothetischen Kaufentscheidungen mit rund 1.000 Personen in der Metropolregion Hamburg...

Innovations and strategies for logistics and supply chains

Wolfgang Kersten, Thorsten Blecker & Christian Marc Ringle
The HICL-Conference celebrates its 10th anniversary, indicating major interest in the research fields of supply chain management and logistics. They are dedicated to make recommendations for new approaches and solutions that enable companies to cope with current and future challenges in supply chains and logistics. The first volume of the 2015 conference addresses innovative and technology-based approaches for logistics and supply chains. It presents business models and investment options for enhanced strategic decision making as...

Operational excellence in logistics and supply chains

Thorsten Blecker, Wolfgang Kersten & Christian Marc Ringle
This volume contains research contributions by an international group of authors focusing on innovative models to optimize logistics and supply chains at an operational level. They address process efficiency and data-related aspects. Supply chain security insights are also given.

Sustainability in Logistics and Supply Chain Management

Wolfgang Kersten, Thorsten Blecker & Christian Marc Ringle
The HICL-Conference celebrates its 10th anniversary, indicating major interest in the research fields of supply chain management and logistics. They are dedicated to make recommendations for new approaches and solutions that enable companies to cope with current and future challenges in supply chains and logistics. The second volume of the 2015 conference provides valuable insights into the highly relevant topic of sustainability in logistics and supply chains. Contributions concern achievement of sustainability and application of...

Synchronization and sequencing of data acquisition and control electronics at the European X-ray free electron laser

Patrick Geßler
Der Europäische XFEL ist eine Großforschungsanlage, die Serien von kurzen Röntgenpulsen erzeugen und an mehrere Experimentierplätze liefern wird. Diese erlauben detaillierte Untersuchungen in verschiedenen Forschungsfeldern. Um die eingesetzte Kontroll- und Datenaufnahmeelektronik synchronisieren und Abläufe steuern zu können, wird ein verteiltes Zeitgebersystem benötigt. Diese Arbeit beschreibt Planung, Entwicklung, Umsetzung und Evaluierung dieses European XFEL Timing Systems.

Systemanalyse und -synthese für die Auslegung varianter Leichtbaustrukturen unter dynamischen Lasten

Benedikt Plaumann
Die vorliegende Arbeit stellt einen neuen methodischen Ansatz zur Unterstützung der Ausle-gung von varianten Leichtbaustrukturen unter stationären dynamischen Lasten vor. Dieser unterstützt die Leichtbauauslegung mit einer simulationsbasierten Vorhersage des Schwingverhaltens bei einer hohen Anzahl an Produktvarianten durch die Kopplung von mehreren dynamischen Substrukturen entsprechend einer modularen Produktstruktur. Das hierzu genutzte hybride Modell kann sowohl Simulationsdaten wie auch reale Testdaten im Frequenzbereich verwenden. Für valide Modelle und Modellparameter wurden umfangreiche Versuche von Sandwichpanels bis hin zu...

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Publication Year

  • 2015

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  • 2015