164 Works

A conceptual modeling approach to health-related urban well-being

Malte Von Szombathely, Myriam Albrecht, Dejan Antanaskovic, Jobst Augustin, Matthias Augustin, Benjamin Bechtel, Thomas Bürk, Jana Fischereit, David Grawe, Peter Hoffmann, Giedrius Kaveckis, Anne Caroline Krefis, Jürgen Oßenbrügge, Jürgen Scheffran & Katharina Heinke Schlünzen
In cities, social well-being faces obstacles posed by globalization, demographic and climate change, new forms of social organization, and the fragmentation of lifestyles. These changes affect the vulnerability of city societies and impact their health-related urban well-being (UrbWellth). The conceptual model introduced in this paper systematizes the relevant variables while considering previous research, and establishes the target value UrbWellth. The model differs from existing approaches mainly in the analytical distinctions it suggests. These allow us...

Substrates and oxygen dependent citric acid production by Yarrowia lipolytica: insights through transcriptome and fluxome analyses

Wael Sabra, Rajesh Reddy Bommareddy, Garima Maheshwari, Seraphim Papanikolaou & An-Ping Zeng
Unlike the well-studied backer yeast where catabolite repression represents a burden for mixed substrate fermentation, Yarrowia lipolytica, an oleaginous yeast, is recognized for its potential to produce single cell oils and citric acid from different feedstocks. These versatilities of Y. lipolytica with regards to substrate utilization make it an attractive host for biorefinery application. However, to develop a commercial process for the production of citric acid by Y. lipolytica, it is necessary to better understand...

Versuche zur Querkrafttragfähigkeit von Stahlbetonplatten unter auflagernahen Einzellasten : Versuchsbericht

Lukas Henze & Günter Axel Rombach
Test report on a series of tests on the shear capacity and load transfer of reinforced concrete slabs without shear reinforcement under concentrated block loads.

Entwicklungswerkzeuge zur Flugzeugauslegung : Tagungsband ; Technologiezentrum Hamburg-Finkenwerder 13. November 1995

Dieter Scholz & Deutsche Gesellschaft Für Luft- Und Raumfahrt (DGLR)
Workshop am Technologiezentrum Hamburg-Finkenwerder, 13. November 1995, Tagungsband / Fachausschuß S2.1 Starrflügelsysteme, Deutsche Gesellschaft für Luft- und Raumfahrt - Lilienthal-Oberth e.V. (DGLR). Inhalt: Teil 1: Integrierter Projektentwurf, Teil 2: Flugphysikalischer Entwurf, Teil 3: Teilaspekte des Projektentwurfs

Optimizing distribution logistics within cities through time-slot deliveries

Tobias Engel, Thomas Wolfenstetter & Nikolaos Sakiotis
Technological evolvement creates new business opportunities such as the optimization of distribution networks by using big data to calculate optimal delivery routes respecting individual time windows. The optimized network enhances firms to improve customer satisfaction, reduce delivery costs, and increase the utilization of the truck load by integrating reverse flows. Following the design science approach, we review and evaluate relevant data and scientific theories. Subsequently, requirements and system design are analyzed. On this basis we...

Automotive supply-chain requirements for a time-critical knowledge management

Ann-Carina Tietze, Jan Cirullies & Boris Otto
Transforming increasingly growing data volumes into knowledge and improving its usage requires knowledge management models (KMM). KMM structures the workflow for decision taking based on knowledge. Industry-suitable requirements for a KMM, in particular for automotive supply chains (SC) and supply-critical bottlenecks, are not raised, especially concerning the crucial parameter of timecriticality. As none of the investigated models suits time-related specifications, requirements for time-critical knowledge management (KM) are derived from former case studies (CS) in the...

Ultra-high performance concrete (UHCP) precast segmental bridges

Jaewoo Shin
Brücken werden schon seit vielen Tausenden von Jahren errichtet. Es liegen somit schon viele Erfahrungen vor. Dennoch werden neue Bauverfahren benötigt, die eine schnellere Errichtung der Konstruktion ermöglichen, weitgehend ohne Beeinflussung des vorhandenen Verkehrs. Weiterhin werden Bauwerke gesucht, die die zunehmenden Verkehrs- und Umwelteinwirkungen aufnehmen können und neue Baustoffe, die die Dauerhaftigkeit verbessern und somit die Unterhaltskosten reduzieren. Extern vorgespannte Segmentfertigteilbrücken (PSB) sind eine Lösung für diese Anforderungen. Die großen Vorteile dieser Bauweise belegen die...

Integrating local scale drainage measures in meso scale catchment modelling

Sandra Hellmers & Peter Fröhle
This article presents a methodology to optimize the integration of local scale drainage measures in catchment modelling. The methodology enables to zoom into the processes (physically, spatially and temporally) where detailed physical based computation is required and to zoom out where lumped conceptualized approaches are applied. It allows the definition of parameters and computation procedures on different spatial and temporal scales. Three methods are developed to integrate features of local scale drainage measures in catchment...

Cybersecurity in ports : a conceptual approach

Jenna Ahokas, Tuomas Kiiski, Jarmo Malmsten & Lauri Ojala
As the world is becoming increasingly digitalized, the role of cybersecurity on society is mounting. Recent cyberattacks have showed the vulnerability of critical infrastructure, including ports. The objective is to describe how cybersecurity is perceived in ports, as preparedness and regulation for cyberthreats in ports appears inadequate. The study is a conceptual analysis built upon a comprehensive literature review. The results show that regardless of the growing awareness of the issue, much work needs to...

Bioprocess development for the syntheses of selected phosphorylated metabolites

Getachew Shibabaw Molla
An in vitro synthesis of optically pure phosphorylated metabolites is useful in various natural biological and synthetic processes. The aim of this thesis was to develop bioprocesses for the syntheses of sn-glycerol-3-phosphate (sn-G3P), L-glyceraldehyde-3-phosphate (L-GAP) and D-glyceraldehyde-3-phosphate (D-GAP). Asymmetric phosphorylation of glycerol catalyzed by glycerol kinase from Cellulomonas sp. (EC 2.7.1.30) utilizing ATP as a phosphoryl donor and Mg2+ as an essential activator was used for the synthesis of sn-G3P. This enzyme exhibits maximum activity...

Advanced occupational standards as basis to improve TVET and teacher training in the Sultanate of Oman

Henning Klaffke & Marc Schütte
Highly skilled teachers in TVET with professional knowledge of real work situation in their field will be a valuable resource for the Sultanate of Oman. In order to improve the vocational training system the Ministry of Manpower is running a Project called Occupational Standards and Skill Testing Center (OSSTC). The first part of the article presents the planed institutional setup of the OSSTC that will be operational till the end of the project in 2010....

A concept for multi-criteria environmental assessment of aircraft trajectories

Sigrun Matthes, Volker Grewe, Katrin Dahlmann, Christine Frömming, Emma Irvine, Ling Lim, Florian Linke, Benjamin Lührs, Bethan Owen, Keith Shine, Stavros Stromatas, Hiroshi Yamashita & Feijia Yin
Comprehensive assessment of the environmental aspects of flight movements is of increasing interest to the aviation sector as a potential input for developing sustainable aviation strategies that consider climate impact, air quality and noise issues simultaneously. However, comprehensive assessments of all three environmental aspects do not yet exist and are in particular not yet operational practice in flight planning. The purpose of this study is to present a methodology which allows to establish a multi-criteria...

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...

Betoninstandsetzung unter Wasser : Mörtelentwicklung und Applikationstechniken

Lina Phan Anh Nguyen-Sauerbaum
Für die Instandsetzung von Betonbauteilen unter Wasser stehen aktuell keine gängigen Verfahren zur Verfügung, die ohne Trockenlegung oder Einschalen des Bauteils auskommen. Diese Arbeit legt die Grundlagen für eine Betoninstandsetzung unter Wasser ohne Einschalen des Bauwerks. Es wurden neue Mörtel entwickelt, die unter Wasser einsetzbar sind und Applikationstechniken untersucht, die eine Applikation unter Wasser mit erfolgreichem Haftverbund erlauben.

End user reporting of suspicious E-mails using X-ARF

Adrian Metzner
End user e-mail abuse reporting rates are very low, however a survey conducted in this thesis revealed that the desire to report abusive e-mails exists. The reason why the report rates are so low is that the process to report abusive e-mails is very time consuming and complex. Therefore, a new process for e-mail abuse reporting is defined. In this new reporting process, end users are able to report suspicious e-mails instead of spam or...

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...

Dynamic behavior of coal-fired power plants with postcombustion CO2 capture

Kai Wellner, Thomas Marx-Schubach & Gerhard Schmitz
Der kombinierte Betrieb einer Post-Combustion CO2-Abscheideanlage und einem Kohlekraftwerk ist ein komplexer Prozess mit deutlichen gegenseitigen Auswirkungen. Auch wenn der Betrieb einer CO2-Abscheideanlage den Wirkungsgrad des Kraftwerks herabsetzt, ergibt sich dadurch die Möglichkeit das Kraftwerk flexibler zu betreiben. Um diesen Prozess zu untersuchen, wird ein detailliertes Modell einer Post-Combustion CO2-Abscheideanlage entwickelt und validiert mit Messdaten. Danach wird das Modell mit dem Modell eines Kohlekraftwerks gekoppelt, um die Effekte des zusammenhängenden Betriebs zu untersuchen. In einem...

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...

Recent development of social simulation as reflected in JASSS between 2008 and 2014 : a citation and co-citation analysis

Jonas Hauke, Iris Lorscheid & Matthias Meyer
The research field of social simulation comprises many topics and research directions. A previous study about the early years indicated that the community has evolved into a differentiated discipline. This paper investigates the recent development of social simulation as reflected in Journal of Artificial Societies and Social Simulation (JASSS) publications from 2008 to 2014. By using citation analysis, we identify the most influential publications and study the characteristics of citations. Additionally, we analyze the development...

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...

Electrochemical tuning of the optical properties of nanoporous gold

Dirk Jalas, Li-Hua Shao, Rashmi Canchi, Toshiya Okuma, Slawa Lang, Alexander Petrov, Jörg Weißmüller & Manfred Eich
Using optical in-situ measurements in an electrochemical environment, we study the electrochemical tuning of the transmission spectrum of films from the nanoporous gold (NPG) based optical metamaterial, including the effect of the ligament size. The long wavelength part of the transmission spectrum around 800 nm can be reversibly tuned via the applied electrode potential. The NPG behaves as diluted metal with its transition from dielectric to metallic response shifted to longer wavelengths. We find that the...

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...

Complete genome sequence of Thermus brockianus GE-1 reveals key enzymes of xylan/xylose metabolism

Christian Schäfers, Saskia Blank, Sigrid Wiebusch, Skander Elleuche & Garabed Antranikian
Thermus brockianus strain GE-1 is a thermophilic, Gram-negative, rod-shaped and non-motile bacterium that was isolated from the Geysir geothermal area, Iceland. Like other thermophiles, Thermus species are often used as model organisms to understand the mechanism of action of extremozymes, especially focusing on their heat-activity and thermostability. Genome-specific features of T. brockianus GE-1 and their properties further help to explain processes of the adaption of extremophiles at elevated temperatures. Here we analyze the first whole...

Embedded spherical localization for micro underwater vehicles based on attenuation of electro-magnetic carrier signals

Daniel-André Duecker, Andreas René Geist, Michael Hengeler, Edwin Kreuzer, Marc-André Pick, Viktor Rausch & Eugen Solowjow
Self-localization is one of the most challenging problems for deploying micro autonomous underwater vehicles ( μ AUV) in confined underwater environments. This paper extends a recently-developed self-localization method that is based on the attenuation of electro-magnetic waves, to the μ AUV domain. We demonstrate a compact, low-cost architecture that is able to perform all signal processing steps present in the original method. The system is passive with one-way signal transmission and scales to possibly large...

Metabolic and proteomic analyses of product selectivity and redox regulation in Clostridium pasteurianum grown on glycerol under varied iron availability

Christin Groeger, Wei Wang, Wael Sabra, Tyll Utesch & An-Ping Zeng
Background: Clostridium pasteurianum as an emerging new microbial cell factory can produce both n-butanol (BuOH) and 1,3-propanediol (1,3-PDO), and the pattern of product formation changes significantly with the composition of the culture medium. Among others iron content in the medium was shown to strongly affect the products selectivity. However, the mechanism behind this metabolic regulation is still unclear. For a better understanding of such metabolic regulation and for process optimization, we carried out fermentation experiments...

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