Publications
Voici les éléments 1381-1440 de 2508
Überlegungen zu einer entrepreneur-orientierten Ausbildung an gewerblichen Fachschulen : eine Bestandsaufnahme mit Vorschlägen für eine Ergänzung des Curriculums
(2010)
In der Arbeit wird untersucht ob eine Ausbildung zum Entrepreneur, also zur Selbständigkeit möglich ist und es wird ein geeigneter curricularer Ansatz gesucht eine Entrepreneurship Education in die Ausbildung zum staatlich ...
Die Übertragung von mikrostrukturellen Eigenschaften aus der diskreten Versetzungsdynamik in Kontinuumsbeschreibungen
(2017)
Physically motivated dislocation density based models for the description of plastic deformation do need information about the underlying processes in a homogenized form. A rate formulation for the formation of the glissile ...
Über lernende optische Inspektion am Beispiel der Schüttgutsortierung
(2018)
Automated visual inspection is an integral part in industrial manufacturing processes, but development and setup of such systems is very costly. Machine learning significantly reduces the effort of and speeds up both tasks. ...
Umgebungskartenschätzung aus Sidescan-Sonardaten für ein autonomes Unterwasserfahrzeug
(2016)
This work makes several contributions to the process of estimating elevation maps from side-scan sonar data: A new estimation method that recreates sonar measurements by pre-computed known sonar responses (so called kernels) ...
Systemtechnische Methodenentwicklung : Diskursive Definition heuristischer prozeduraler Prozessmodelle als Beitrag zur Bewältigung von informationeller Komplexität im Produktleben
(2008)
Gegenstand der Arbeit ist die Strukturierung und damit Systematisierung der Methodenentwicklung. Es wird ein Vorgehensmodell beschrieben, welches die Methodenentwicklung in übersichtliche Phasen gliedert und ausführlich ...
Timber Engineering - Principles for Design
(2017)
This comprehensive book provides in-depth knowledge and understanding of design rules according to Eurocode 5. It is based on the first edition of the STEP (Structural Timber Education Programme) series, which was prepared ...
Supraleitende koplanare Mikrowellenfilter für radioastronomische Empfänger bei 15 K
(2005)
In dieser Arbeit wird die anwendungsorientierte Entwicklung von Empfangsfiltern für das Radioteleskop des Max Planck Institutes für Radioastronomie (MPIfR) in Effelsberg vorge-stellt. Dort bestand großes Interesse an ...
Surface wave driven molecular low pressure plasmas for general lighting
(2016)
Nowadays, compact fluorescent lamps are widely-used in general lighting applications. However, they still struggle with acceptance problems due to the hazardous mercury, which serves as the radiant component inside the ...
Sustainability of the German Pension Scheme: Employment at Higher Ages and Incentives for Delayed Retirement
(2014)
The aging society and threatening old-age poverty are two major political topics in Germany for the next decades. Many modern employment biographies consist of atypical employment and discontinuities; both negatively impact ...
Sustainable Development - Relationships to Culture, Knowledge and Ethics
(2011)
The emergence of a global and technological world and its accelerating, dissemination before the beginning of the 21st century does not only give rise to technological, economic, social, environmental, political, and ...
Die tribologischen Eigenschaften von vergoldeten elektrischen Kontakten
(2013)
Electrical contacts in automotive applications are exposed to thermal and vibration induced relative motion in the tribological contact. Fretting tests with an AuCo/Ni vs. Au/NiP ball to plate contact were conducted in ...
True-Time-Delay Beamforming für ultrabreitbandige Systeme hoher Leistung
(2010)
In dieser Arbeit werden folgende Punkte, zum Teil erstmalig, untersucht:- Entwicklung eines analytischen Modells zum schnellen Design von Rotman-Linsen- Rotman-Linsen im Zeitbereich bei transienten Eingangssignalen- ...
Trusted Computing für adaptive Automobilsteuergeräte im Umfeld der Inter-Fahrzeug-Kommunikation
(2011)
Die vorliegende Arbeit beschäftigt sich mit der Sicherheit (Security) von Automobilelektronik, speziell der Kommunikation zwischen Fahrzeugen für Safety-Anwendungen. Hierzu wird die Absicherung der Kommunikation über ...
Tunable Security for Deployable Data Outsourcing
(2015)
Security mechanisms like encryption negatively affect other software quality characteristics like efficiency. To cope with such trade-offs, it is preferable to build approaches that allow to tune the trade-offs after the ...
Ultra-fast YBa2Cu3O7-x direct detectors for the THz frequency range
(2013)
For the analysis and optimization of the picosecond pulsed terahertz radiation generated by electron storage rings or other pulsed sources, ultra-fast detectors are required which are able to resolve picosecond dynamic ...
UHV-FTIRS-Untersuchungen an einkristallinen Oxidoberflächen
(2013)
In dieser Arbeit wurden metalloxidische Systeme mittels Infrarot-Reflektions-Absorptionsspektroskopie (IRRAS) im Ultrahochvakuum charakterisiert. Dies sind im Speziellen als Modellsystem für die Methanolsynthese die ...
Ultrafast nonlinear silicon waveguides and quantum dot semiconductor optical amplifiers
(2011)
In this book, nonlinear silicon-organic hybrid waveguides and quantum dot semiconductor optical amplifiers are investigated. Advantageous applications are identified, and corresponding proof-of-principle experiments are ...
Ultrabreitbandige Strahlungseinkopplung in THz-Detektoren
(2013)
Bolometric sensors show promising properties for the detection of THz radiation. To achieve an efficient coupling of the THz radiation into the detector, antenna structures with an ultra-high bandwidth have been developed ...
Ultrakurzzeitdynamik von Fulleriden in Lösung und suspendierten, längenselektierten Kohlenstoffnanoröhren
(2008)
In dieser Arbeit wurde die Relaxationsdynamik des ersten elektronisch angeregten Zustandes von Fullerid-Anionen sowie von längenselektierten CNT in Lösung mittels fs-Spektroskopie durchgeführt. Für die Dynamik der Fulleride ...
Ultrafast Dynamics of Metalloporphyrins, DNA and Iron-Lanthanide Clusters in the Liquid Phase
(2013)
Ultraschnelle Dynamik von verschiedenen organischen und anorganischen molekularen Systemen wurde unter Verwendung der zeitaufgelöste Anregungs-Abfrage-Technik in Kombination mit anderen spektroskopischen Methoden untersucht. ...
Ultraschnelle zeitaufgelöste Pump/Probe-Photoelektronenspektroskopie an isolierten und massenselektierten Anionen
(2006)
In der vorliegenden Arbeit wird die Anregungs/Abfrage-Photoelektronenspektroskopie auf die Untersuchung elektronischer Dynamik in massenselektierten Molekülionen unter Hochvakuum-Bedingungen angewendet, wodurch die Beobachtung ...
Ultrakurzzeitdynamik ausgewählter Germaniumcluster, mehrkerniger Seltenerdverbindungen sowie quasi monodisperser (9,7)-Kohlenstoffnanoröhren in Lösung
(2011)
In dieser Arbeit wurden mittels zeitaufgelöster Anregungs-Abfrage-Spektroskopie Untersuchungen zum Relaxationsverhalten eines neunkernigen Germaniumclusters, vierkerniger Lanthanoidkomplexe sowie einwandiger (9,7)-Kohlen ...
Ultrafast photophysics and photochemistry of radical precursors in solution
(2012)
The photoinduced dynamics of radical precursors in solution were investigated by means of femtosecond transient absorption spectroscopy assisted by quantum chemical calculations. The investigated systems show a wide range ...
Uncertainty handling in multi-attribute decision support for industrial risk management
(2008)
The complexity of today's industrial production networks constitutes a new challenge for industrial risk and safety management. In order to handle potential risks to and emanating from industry and their respective impact ...
Uncertainties in energy markets and their consideration in energy storage evaluation
(2013)
This book successfully illustrates the modeling of electricity prices with the help of stochastic processes. The relatively new phenomenon of negative prices is also integrated into the models. The integration of feed-in ...
Systemdesign im Market-Engineering - Experimente zu Teilnehmerverhalten und Technologieakzeptanz
(2008)
Elektronische Märkte haben in den letzten Jahren in vielen Bereichen auch des täglichen Lebens zunehmend an Bedeutung gewonnen. Um im Konkurrenzkampf bestehen zu können, sind die Anbieter elektronischer Marktplätze wie ...
Die Tagesschau-App und die Notwendigkeit der Schaffung eines ""Intermedienkollisionsrechts""
(2013)
The article takes up the example of online news-services to describe the overall purpose of Germany's public broadcasting corporation within the new networks of electronic media. It argues that the rise of the Internet is ...
Time-dependent spectrum analysis of high power gyrotrons
(2015)
In this work, a novel measurement system for the analysis of the gyrotron RF output spectrum was developed. It enables unprecedented time dependent measurements within a large bandwidth, dynamic range and unambiguous RF ...
Time-efficient Simulation of Surface-excited Guided Lamb Wave Propagation in Composites
(2012)
The methods of time-efficient simulation of surface-excited wave propagation in plate-like multilayered composites are presented. The mathematical model of wave propagation in laminated plate based on the elasticity theory ...
Tolerance Simulation in the Loop : Ansätze zur Verbesserung der Vorhersagegenauigkeit der Toleranzsimulation im Automobilbau durch Adaption an reale Fertigungsprozesse
(2019)
The dimensional accuracy in the body-in-white manufacturing process is analysed, basically confirming the simulation scope already in use. An enhanced prediction approach and a visualisation tool enable a precise and ...
Tool-supported identification of functional concerns in object-oriented code
(2010)
Concern identification aims to find the implementation of a functional concern in existing source code. In this work, concerns are described, using the Hierarchic Concern Model, as gray-boxes containing subconcerns, inputs, ...
Tourenplanung mit alternativen Lieferperioden und Teillieferungen
(2014)
This book examines the Vehicle-Routing-Problem with split-deliveries and alternative delivery periods (SDVRPA). It is solved with a Branch-and-Price-Algorithm. When alternative delivery periods and split-deliveries are ...
Tourenplanung für den eCommerce-Lebensmittel-Heimlieferservice
(2006)
In dieser Arbeit wird das praxisrelevante Problem der Tourenplanung im eCommerce-Lebensmittel-Heimlieferservice im Kontext transportlogistischer und betriebswirtschaftlicher Anforderungen untersucht. Ausgehend von der ...
Towards a rigorous fusion of GNSS and InSAR observations for the purpose of water vapor retrieval
(2014)
In the framework of the rigorous fusion of GNSS and InSAR observations, the presented work carries out at a straightforward comparison of the wet delay, caused by water vapor, derived from GNSS and InSAR. The contributions ...
Towards automated restructuring of object oriented systems
(2008)
The work introduces a method for diagnosing design flaws in object oriented systems, and finding meaningful refactorings to remove such flaws. The method is based on pairing up a structural pattern that is considered ...
Towards magnetic resonance in scanning tunneling microscopy using heterodyne detection
(2015)
The present work introduces a new concept for magnetic resonance measurements in the GHz regime inside a scanning tunneling microscope. It is based on heterodyne detection in a spin-polarized tunneling barrier. The ...
Tracking Extended Objects in Noisy Point Clouds with Application in Telepresence Systems
(2016)
We discuss theory and application of extended object tracking. This task is challenging as sensor noise prevents a correct association of the measurements to their sources on the object, the shape itself might be unknown ...
Tracking Extended Objects with Active Models and Negative Measurements
(2019)
Extended object tracking deals with estimating the shape and pose of an object based on noisy point measurements. This task is not straightforward, as we may be faced with scarce low-quality measurements, little a priori ...
Tragfähigkeit von Verbindungen mit selbstbohrenden Holzschrauben mit Vollgewinde
(2006)
Gegenwärtig stehen für den Holzbau selbstbohrende Vollgewindeschrauben mit Längen bis zu 600 mm und Durchmessern bis zu 12 mm zur Verfügung, die ohne Vorbohren und damit schnell und wirtschaftlich ins Holz eingedreht werden ...
Tragfähigkeit von stiftförmigen Verbindungsmitteln in Brettsperrholz
(2007)
Im Rahmen dieser Forschungsarbeit wurden Vorschläge zur Ermittlung der Tragfähigkeit von Verbindungen mit stiftförmigen Verbindungsmitteln in den Seiten- und Schmalflächen von Brettsperrholz erarbeitet. Die für die Berechnung ...
Tragverhalten von biegebeanspruchten Stahlmasten mit polygonalen Querschnitten
(2015)
This work deals with the bending moment capacity of thin-walled steel poles with polygonal sections. Based on experimental and numerical investigations the bearing behavior of steel poles in bending with polygonal sections ...
Transformation von Multiphysics-Modellen in einen FPGA-Entwurf für den echtzeitfähigen HiL-Test eingebetteter Systeme
(2013)
This work establishes an integrated tool chain from modeling physical simulations to design automation for FPGA-based real-time simulations. Modelica was chosen as a versatile, intuitive and object-oriented modeling language. ...
Transistor- und Leitungsmodellierung zum Entwurf von monolithisch integrierten Leistungsverstärkern für den hohen Millimeterwellen-Frequenzbereich
(2013)
The aim of this work is the design of monolithic integrated power amplifiers for frequencies from 200 to 250 GHz and beyond. For this, reliable and flexible transmission line and transistor models are required. The models ...
Transient behaviour of ITER poloidal field coils
(2011)
Transient voltages occur on the terminals of superconducting coils and may lead to internal over-voltages. The main objective of this work was to calculate the transient electrical behaviour and internal voltage distribution ...
Transport- und Umsatzprozesse bei der Abwasserversickerung aus undichten Kanälen
(2007)
Abwasserkanäle erleiden im Verlauf ihrer Nutzung Schäden durch Abnutzung, Alterung oder sonstige Einwirkung, die zu Undichtigkeiten führen können. Durch die Undichtigkeiten kann entweder unbelastetes Fremdwasser aus dem ...
Travel Time Models and Throughput Analysis of Dual Load Handling Automated Storage and Retrieval Systems in Double Deep Storage
(2018)
A general analytical travel time model for the quadruple command cycle in double deep storage systems with a dual capacity load handling device is formulated and validated by means of a simulation model. Various routing ...
Treatment of phenolic wastewater in suspended and fixed bed bioreactors
(2009)
Phenol and chlorophenols are among the most important class of raw materials in chemical industry. These compounds also list among priority pollutants. The main problem in treating phenol or chlorophenol containing wastewater ...
Neue Methode zur Bestimmung und Beschreibung der taktfrequenten Stromsteigungen in Drehstromsynchronmaschinen
(2022)
Knowledge of the cycle-frequency changes in the machine currents is of great advantage for many methods of controlling modern, highly utilized electrical machines. But how can these changes in machine currents be reliably ...
Design of Cast Steel Components under Cyclic Loading
(2022)
This work presents a design approach that links fatigue resistance of cast steel component to permissible defect sizes. It is based on fractures mechanics, is in line with experiences of the last 60 years and validated by ...
Chip-scale optical frequency comb sources for terabit communications
(2022)
To keep up with the ever-increasing data transmission speed needs, data center interconnects are scaling up to provide multi-Tbit/s connectivity. These links require a high number of WDM channels, while the associated ...
Objektivierung des Schwingungskomforts schwerer Nutzfahrzeuge
(2021)
A time efficient development process of new trucks includes an early development of ride comfort before real prototypes exist. Therefore it is necessary to determine objective and measurable characteristic values to predict ...
Entwicklung einer Kontinuumsbeschreibung für die Versetzungsmobilität in Versetzungsnetzwerken
(2020)
This work deals with the homogenization of dislocation reactions across slip systems in a physically based three-dimensional formulation of metal plasticity. Based on comparisons with discrete dislocation dynamics simulations, ...
Zur Geschichte der Reedereigebaude an der Elbstrase bei der Alten Liebe in Cuxhaven seit den 1920er Jahren
(2020)
This study will discuss the history of the creation, construction and use of three distinctive shipping company villas in the harbour of Cuxhaven/Germany, located south of the harbours lighthouse, near the Alte Liebe”. The ...
Modellierung und Optimierung der strömungstechnischen Vorgänge in Abweiseradsichtern
(2022)
Centrifugal classifiers are processing machines used in the gas-particle classification. The aim of this work is to reduce energy costs by improving the classification properties and reducing the pressure drop. In addition ...
Integrierte planare Antennen für supraleitende Detektorsysteme zur THz-Strahldiagnostik
(2022)
In the THz frequency range, superconducting detectors coupled to planar antennas are well suited for the use in the field of accelerator beam diagnostics. This work studies the coupling efficiency and spectral sensitivity ...
Optical coherence tomography for characterization of nanocomposite materials
(2021)
Major challenges in nanoparticle and nanocomposite development are the control of particle size and shape, and to achieve uniform particle dispersion. In this book, the application of optical coherence tomography (OCT) for ...
Untersuchung der Augensicherheit durch Multi-Pulsbestrahlung für LiDAR-Anwendungen
(2022)
LiDAR (Light detection and ranging) represents one of the key technologies for autonomous driving. For this reason, this work is concerned with the question of eye safety of the laser-based technology. For this purpose, ...
Bildfolgenbasierte Gewinnung und Nutzung partikelindividueller Bewegungsinformation in der optischen Schüttgutsortierung
(2022)
Sensor-based sorting enables the separation of individual particles from a material stream. In this work, a novel sorting system using an area-scan camera is investigated. The use of high-speed cameras raises exciting ...
Biegefestigkeit von Trägern aus kreissektorförmigen Lamellen
(2022)
Laminated Segment Timber (LST) consists of mutually glued trapezoidal lamellas made of Spruce. Due to the optimization of process parameters the wood yield can be increased to an average of 85 %. LST and layered LST are ...