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The transport of bacteria in turbulent river-like environments is addressed, where bacterial populations are frequently encountered attached to solids. This transport mode is investigated by studying the transient settling of heavy particles in turbulent channel flows featuring sediment beds. A numerical method is used to fully resolve turbulence and finite-size particles, which enables the assessment of the complex interplay between flow structures, suspended solids and river sediment.
Umfang: XV, 258 S.
Preis: 51.00 €
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Scheinbar losgelöst von Mobilitätsalternativen in Städten besitzt das Auto immer noch eine hohe Relevanz bei der persönlichen Mobilität. Um die Rolle des Autos zu untersuchen, wird ein Erhebungskonzept zur mehrdimensionalen Betrachtung urbaner Mobilität vorgestellt: das Mobilitätsskelett. Der modulare Aufbau verbindet die Erhebung der Alltagsmobilität in einer typischen Woche mit seltenen Fernverkehrsereignissen als Quasi-Längsschnitt und ermöglicht die Erfassung psychographischer Eigenschaften.
Seemingly detached from attractive mobility alternatives in cities the car remains highly relevant in personal mobility. In order to investigate the role of the car, a new survey concept for a multidimensional analysis of urban mobility is presented: the travel skeleton. The modular design combines the collection of everyday trips in a typical week with occasional long-distance trips in a quasi-longitudinal approach. The concept also captures associated psychographic characteristics.
Umfang: XXII, 404 S.
Preis: 52.00 €
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Proposed in the early 1990s, the enhanced assumed strain (EAS) method is one of the probably most successful mixed finite element methods for solid mechanics. This cumulative dissertation gives a comprehensive overview of previous publications on that method and covers recent improvements for EAS elements. In particular, we describe three key issues of standard EAS elements and develop corresponding solutions.
Umfang: X, 195 S.
Preis: 48.00 €
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Die Betonbranche steht vor der großen Herausforderung, die CO₂-Emsissionen drastisch zu senken und somit einen Beitrag zu Nachhaltigkeit und Klimaschutz zu leisten. In diesem Tagungsband möchten wir den Fokus darauf richten, wie wir durch das Bauen im Kreislauf die Betonbranche nicht nur nachhaltiger, sondern auch kosteneffizienter gestalten können. Dabei stehen insbesondere das Recycling von Beton und die Wiederverwendung ganzer Betonbauteile im Vordergrund.
The concrete industry is facing the major challenge of drastically reducing CO₂ emissions and thus contributing to sustainability and climate protection. In these conference proceedings, we would like to focus on how we can make the concrete industry not only more sustainable but also more cost-efficient by adopting the circular economy in the building sector. In particular, we focus on the recycling of concrete and the reuse of entire concrete components.
Umfang: III, 67 S.
Preis: 41.00 €
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Erstmals wurden neue Verbinder aus Kunstharzpressholz (KPH) realisiert. Zu Beginn erfolgte eine Oberflächenbehandlung des KPH, um die Reibung zwischen Verbinder und Holzbauteil in den Scherfugen zu erhöhen und somit die Tragfähigkeit der Verbindung deutlich zu steigern. In Reibversuchen wurden Reibeiwerte der Oberflächen ermittelt. In anschließenden Druck-Scher-Versuchen wurde das Verhalten der Oberflächen in Verbindungen mit geneigt eingedrehten Vollgewindeschrauben untersucht.
For the first time new connectors were realized using densified veneer wood (DVW). Initially, the DVW surface was modified to increase the friction between the connector and the timber part in the shear plane and thus significantly increase the load-carrying capacity of the connection. Friction tests were carried out to determine the friction coefficients of the surfaces. Based on the friction tests, the behavior of the surfaces in combination with inclined screws was investigated.
Umfang: V, 205 S.
Preis: 43.00 €
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Multi-frequency and multi-GNSS measurements from modernized satellites are properly integrated for PPP with ambiguity resolution to achieve the state-of-the-art fast and accurate positioning, which provides an important contribution to GNSS precise positioning and applications. The multi-frequency and multi-GNSS PPP phase bias estimation and ambiguity resolution, which is accomplished by a unified model based on the uncombined PPP, are thoroughly evaluated with special focus on Galileo and BDS.
Umfang: XI, 132 S.
Preis: 46.00
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An innovative strengthening technique for the seismic retrofitting of masonry buildings is the fabric-reinforced cementitious matrix (FRCM). The system presented in this work is EQ-GRID, which consists of a multi-axial hybrid grid made of alkali-resistant glass and polypropylene fibres and a natural hydraulic lime mortar (NHL) as matrix. The results of the performed experimental campaign and the numerical modelling with the Equivalent frame method are presented and discussed in this work.
Umfang: XXXVII, 307 S.
Preis: 72.00 €
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Brücken sind zentrale Bestandteile von Infrastrukturnetzen, die die Grundvoraussetzung für eine prosperierende Wirtschaft sind. Hinsichtlich der Erhaltungsplanung ist eine fundierte Kenntnis des tatsächlichen Brückenzustandes von hohem Interesse. In dieser Arbeit wird ein modalbasiertes Monitoringsystem entwickelt, welches die subjektiv beeinflusste visuelle Prüfung von Brückenbauwerken gemäß DIN 1076 durch eine objektive sensorgestützte Überwachung ergänzen kann.
Bridges are key components of infrastructure networks, which are the basic prerequisite for a prospering economy. Regarding maintenance scheduling, profound knowledge of the current bridge condition is of high interest. In this work, a modal-based monitoring system is developed, which can augment the subjectively influenced visual inspection of bridge structures according to DIN 1076 by an objective sensor-based monitoring.
Umfang: XVII, 271 S.
Preis: 69.00 €
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Segmentlamellenholz (SLH) wird aus wechselseitig verklebten Trapezlamellen aus Fichtenholz hergestellt. Durch die Optimierung verschiedener Prozessparameter kann die Holzausbeute auf ca. 85 % gesteigert werden. Übereinander verklebtes SLH bildet den Werkstoff Segmentschichtholz (SSH). Beide Produkte sind in der ETA-19/0832 geregelt. Simulationsstudien befassen sich mit den char. Biegefestigkeiten bei variierender Trägerhöhe und -breite sowie Änderungen im Herstellungsprozess.
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 regulated in ETA-19/0832. Simulation studies deal with the characteristic bending strength at variing member depth and height as well as modifications in the production process.
Umfang: XIV, 253 S.
Preis: 49.00 €
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Research goal of the present monograph is the establishment of an efficient engineering approach, which will include straightforward but accurate simulation models, in order to estimate the residual stress fields of welded joints introduced during welding and their post-weld treatment with High Frequency Hammer Peening. The present subject lies on the intersection of structural engineering, material science and computational mechanics.
Umfang: XXXIX, 262 S.
Preis: 68.00 €
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