3,247 Works

Seamless integration of location-linked services for smartphones

Julian Ohrt
In dieser Arbeit wird das System Building-Linked, Expeditious Services System (BLESS) entworfen, das es erlaubt gebäude-gebundene Dienste auf Smartphones zu benutzen ohne vorherige Installation über einen App-Store. Betritt ein Benutzer mit einem Smartphone ein mit BLESS ausgestattetes Gebäude, werden nutzbare Dienste automatisch gefunden und anzeigt. Bei der Dienstauswahl werden sowohl Aufenthaltsortes des Nutzers, sowie seine Identität miteinbezogen. BLESS wurde als Prototyp implementiert. Ergebnisse des Feldtests werden beschrieben und anhand daran das System bewertet und Verbesserungspotenzial...

Dynamic measurement of near-field radiative heat transfer

Slawa Lang, Gaurav Sharma, Sean Molesky, Patrick Udo Kränzien, Tim Jalas, Zubin Jacob, Alexander Petrov & Manfred Eich
Super-Planckian near-field radiative heat transfer allows effective heat transfer between a hot and a cold body to increase beyond the limits long known for black bodies. Until present, experimental techniques to measure the radiative heat flow relied on steady-state systems. Here, we present a dynamic measurement approach based on the transient plane source technique, which extracts thermal properties from a temperature transient caused by a step input power function. Using this versatile method, that requires...

Elasticity and plasticity of nanoporous gold: implications of molecular dynamics simulations

Dinh Bao Nam Ngo
Molekulardynamische Simulationen von Kompressionsprüfungen an virtuellen nanoporösen Goldproben, die durch Nachahmung spinodaler Entmischung durch Monte-Carlo-Simulationen erstellt wurden, zeigen ein ungewöhnlich nachgiebiges und weiches Verhalten. Dieses Materialverhalten, welches in guter Übereinstimmung mit experimentellen Daten an millimetergroßem, entlegiertem nanoporösem Gold ist, verändert sich drastisch, wenn die Netzwerkkonnektivität verändert wird. Topologische Unordnung verursacht durch Verschiebung der Netzwerkknoten nimmt ebenfalls Einfluss auf das effektive Materialverhalten. Dennoch müssen, zusätzlich zu den oben erwähnten topologischen Beschreibungen und des Feststoffanteils, Prozesse auf...

Digitalization in supply chain management and logistics

Wolfgang Kersten, Thorsten Blecker & Christian M. Ringle
This volume contains research contributions by an international group of authors addressing innovative and technology-based approaches for logistics and supply chains. They present business models and investment options for enhanced strategic decision making as well as recent approaches for supply chain risk management. This volume, edited by Wolfgang Kersten, Thorsten Blecker and Christian Ringle, provides valuable insights into the digitalization of Supply Chain Management and Logistics with regard to: Innovation and Technology Management, Advanced Manufacturing...

Lead-time optimization potential of digitization in air cargo

Benjamin Bierwirth & Kai-Oliver Schocke
The air cargo supply chain consists of several parties: the forwarders collect air cargo shipments and consolidate these shipments in regional warehouses all over the continent. They decide upon the export airport and bring it there to consolidate all shipments in their air cargo hub - warehouse according to the chosen flight. Using local truckers, the shipments, consolidated by airline, are forwarded to the handling agents to load air cargo containers or to build up...

Adsorption and diffusion in zeolites : the pitfall of isotypic crystal structures

Nils E. R. Zimmermann, Maciej Haranczyk, Manju Sharma, Bei Liu, Berend Smit & Frerich Keil
Untersucht wird der Einfluss von isotypischen Kristallstrukturen auf die Adsorption und Diffusion von Methan in Vollsilikatzeolithe der Gittertypen LTA, SAS und ITE. Resultate, die auf Grundlage von experimentellen Strukturen erzielt wurden, werden mit Resultaten basierend auf Strukturvorhersagen und gängigen Strukturannäherungen verglichen. Die Ergebnisse weisen darauf hin, dass der Diffusionskoeffizient hierbei sehr viel stärker beeinflusst wird als der Henry-Koeffizient. Tatsächlich können Unterschiede im Diffusionskoeffizienten von mehreren Größenordnungen beobachtet werden. Eine systematische Untersuchung hebt letztendlich hervor, dass...

Simulation-framework for illicit-goods detection in large volume freight

Lutz Kretschmann & Torsten Münsterberg
Innovative non-intrusive inspection technologies can help customs prevent illicit trade in large volume freight. Validation whether technologies fulfill their intended purpose ideally takes place under real conditions. However, constraints limit the number and type of experiments performed during such field trials. Against this background simulation offers the opportunity to evaluate improvements in detection of illicit-goods without interrupting activities on site. A discrete event simulation framework in the context of large volume freight is introduced in...

Bibliometric analysis of risk management in seaports

Ayman Nagi, Marius Indorf & Wolfgang Kersten
Seaports play an essential role in global supply chains. Incidents and accidents in such ports may lead to service delays, port closure as well as damage to people, property and the environment. Therefore, risk management in seaports plays an important role in mitigating and preventing possible accidents and disruptions. This paper aims to explore the structure of literature on risk management in seaports using co-citation analysis in order to reveal its current main research areas...

Productive ponds as part of rainwater harvesting systems in the context of the slope farming project Arba Minch, Ethiopia

Stefan Hügel
In Gebieten mit langen Trockenzeiten sind Rainwater Harvesting Systeme von entscheidender Bedeutung für die Anpassung an den Klimawandel, besonders im Regenfeldbau. Wasserspeichernde Erdteiche können in ländlichen Bereichen einfach angelegt werden und in ihrer Funktionalität erweitert werden, um nicht nur Wasser zu speichern, sondern auch um aquatische Pflanzen und Tiere zu züchten. In diesem Zusammenhang sind besonders Azolla spp. und Teichlinsen hervorzuheben, die beide zu den produktivsten Pflanzen gehören und Potential zur Verwendung als Tierfutter, Gründünger...

Business model innovation : a case of the offshore lifting equipment supplier

Mikhail Shlopak, Richard Myhre & Gabriele Hofinger Jünge
The purpose of this paper is to present the background for and the process of development of an Internet of Things (IoT) business model (BM) for a Norwegian offshore lifting equipment supplier. The paper presents both challenges and new opportunities connected to the case company’s transition towards IoT, servicebased BM. The research methodology is a single case study research. The research approach involves four steps: theoretical discussion; a case study; analysis of the case study,...

A peer-to-peer platform for decentralized logistics

Olivier Gallay, Kari Korpela, Niemi Tapio & Jukka K. Nurminen
We introduce a novel platform for decentralized logistics, the aim of which is to magnify and accelerate the impact offered by the integration of the most recent advances in Information and Communication Technologies (ICTs) to multi-modal freight operations. The essence of our peer-to-peer (P2P) framework distributes the management of the logistics operations to the multiple actors according to their available computational resources. As a result, this new approach prevents the dominant players from capturing the...

IoT-coordinated logistics in product-service systems

Jürgen Anke
Product-Service Systems (PSS) enable new value to customers compared to traditional selling of goods, e.g. through new business models such as Performancebased contracting (PBC) and Pay-per-use (PPU). This turns the manufacturer into a service provider, which has to perform maintenance, repair and operation (MRO) tasks for the products provided in a PSS. Therefore, the service provider must organize the logistics of the equipment, spare parts, and consumables in a timely manner. In this paper, we...

Digitalization of logistics processes and the human perspective

Adina Silvia Kuhlmann & Matthias Klumpp
This contribution presents an analysis of the increasing consequences of digitalization with a focus on self-monitoring of personnel in logistics and production processes. This is of interest as digitalization requires large-scale innovative implementation and change management approaches in logistics and production processes. Based on standard DIN ISO 10.075 (’risk assessment’) an applicationoriented instrument is developed to evaluate und test new job systems, which are impacted by digitalization. This enables the development of digitalization strategies and...

Reducing truck congestion at ports – classification and trends

Ann-Kathrin Lange, Anne Schwientek & Carlos Jahn
Truck drayage in container ports faces several challenges. Due to the ongoing growth of container ship sizes, there are increasingly high peak situations in landside container handling at logistic nodes in the port, e.g. container terminals, empty depots, freight stations. In combination with rising demands to improve the port’s ecological footprint this requires the port and its companies to adapt to the situation in order to reduce congestion. To identify important methods, key parameters, past...

Assessing and improving countries’ logistics skills and training

Alan C. McKinnon, Kai Hoberg, Moritz Petersen & Christina Busch
Evidence is mounting to suggest that there is a global shortage of people with the right skills to meet the evolving needs of the logistics industry. Especially emerging regions are lagging behind, inhibiting economic growth. Thus, governments should systematically assess and address skills shortages in logistics. Commissioned by the World Bank, we devised a toolkit for assessing the availability of logistics skills within low- and middle-income countries. We built on the maturity model concept and...

Literature classification on dispatching of container terminal vehicles

Anne Schwientek, Ann-Kathrin Lange & Carlos Jahn
Horizontal transport on container terminals represents the interface between quay and yard. Efficient transport operations are essential to improve performance and productivity. Thereby, one main decision problem is dispatching the vehicles. Despite the large amount of literature in this field, there is no classification or survey of the respective literature. Based on an extensive survey of dispatching literature published between 2000 and 2016, a classification scheme is developed and applied to 81 scientific publications. The...

Life cycle assessment for frozen food distribution schemes

Markus Trapp, Michael Lütjen, Juan Daniel Arango Castellanos, Oliver Jelsch & Michael Freitag
The online grocery market is facing big challenges. In addition to products for daily use, it is necessary to deliver fresh, chilled and frozen foods quickly and reliably to the customer. For decades frozen products have been delivered to the customers by using small cooling vans. Since some years, also normal parcel delivery services in combination with insulated shipping containers have been used. This article examines in a comparative analysis the environmental impact based on...

Investigation of core structure and stability of human Pyruvate Dehydrogenase complex: A coarse-grained approach

Samira Hezaveh, An-Ping Zeng & Uwe Jandt
The human pyruvate dehydrogenase complex (hPDC) is a large macromolecular machine, and its unique structural and functional properties make it a versatile target for manipulation aiming for the design of new types of artificial multienzyme cascades. However, model-based and hence systematic understanding of the structure−function relationship of this kind of complexes is yet poor. However, with new structure data, modeling techniques, and increasing computation power available, this shortfall is about to cease. Recently, we have...

Dynamische Messung von Adsorptionsgleichgewichten an Nanopartikeln in nah- und überkritischen Lösungen: Experimenteller Ansatz und thermodynamische Modellierung

Johannes Kern
Die vorliegende Dissertation beschäftigt sich mit der experimentellen und theoretischen Darstellung der Adsorption gelöster Substanzen in überkritischem Kohlenstoffdioxid an Nanopartikel. Es wird zunächst die experimentelle Bestimmung von Adsorptionsgleichgewichten aus überkritischem Kohlenstoffdioxid an Nanopartikel behandelt. Dafür wurden Nanopartikel aus Al2O3 sowie AlO(OH) mit unterschiedlichen Packmethoden in chromatographische Säulen gepackt und die gepackten Säulen hinsichtlich Packungsqualität und Eignung für dynamische Adsorptionsmessmethoden charakterisiert. Dabei stellte sich heraus, dass ein Kompromiss zwischen Packungsqualität und Druckverlust der Säule eingegangen werden...

TUHH Spektrum September 2004

Windenergieanlage, Stahl für Fährschiffe, Hochwasserschutz, Logistik

TUHH Spektrum Oktober 2005

Carbon Nanotubes, Nanotechnologie in Werkstoffen, Extremozyme als Biokatalysatoren, Neue Prüftechnologie zur Erkennung gefälschter Münzen, Logistik, Abenteuer Studium

A Jacobi-Davidson-type Projection Method for nonlinear eigenvalue problems

Timo Betcke & Heinrich Voß
This article discusses a projection method for nonlinear eigenvalue problems. The ansatz space is constructed by a Jacobi-Davidson type approach, and the arising eigenproblems of small dimension are solved by safeguarded inverse iteration. The method is applied to a rational eigenvalue problem governing the vibrations of tube bundle immersed in an inviscid compressible fluid.

Solving a Rational Eigenvalue Problem in Fluid-Structure Interaction

Heinrich Voß
In this paper we consider a rational eigenvalue problem governing the vibrations of a tube bundle immersed in an inviscid compressible fluid. Taking advantage of eigensolutions of appropriate sparse linear eigenproblems the large nonlinear eigenvalue problem is projected to a much smaller one which is solved by inverse iteration.

Theoretical investigation of the nitrous oxide decomposition over iron zeolite catalysts

Andreas Heyden
In dieser Arbeit wurde die N2O-Zerlegung auf dem Fe-ZSM-5 Katalysator mittels quantenchemischer Dichtefunktionalmethoden untersucht. Mit theoretisch bestimmten Reaktionsmechanismen und -geschwindigkeiten konnten nahezu alle experimentellen Ergebnisse zur N2O-Zerlegung in Ab- und Anwesenheit von Stickoxid simuliert werden. Hoch effiziente Algorithmen zur Übergangszustandssuche wurden entwickelt.

How to use analogies for breakthrough innovations

Katharina Schild, Cornelius Herstatt & Christian Lüthje
Analogies can trigger breakthrough ideas in new product development. Numerous examples demonstrate that substantial innovations often result from transferring problem solutions from one industry or domain to another. For instance, the designers of the new running shoe generation of Nike, “Nike SHOX”, use the same suspension concept like the technologies applied for Formula 1 racing cars, or the biological Lotus-effect led to the development of various self-cleaning surfaces. Academic research on analogical thinking has been...

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