Not Just Algorithms: Strategically Addressing Consumer Impacts in Information Retrieval

Information Retrieval (IR) systems have a wide range of impacts on consumers. We offer maps to help identify goals IR systems could—or should—strive for, and guide the process of scoping how to gauge a wide range of consumer-side impacts and the possible interventions needed to address these effects. Grounded in prior work on scoping...

Shearography non-destructive testing of a composite ship hull section subjected to multiple impacts

The use of thick composites and sandwich structures is increasing rapidly in marine, aerospace, and wind energy industries [1–3]. For example in the marine sector, sandwich structures consisting of glassfiber laminate skins bonded to a foam core are attractive because of the advantages of being light-weight, resistant to corrosion and underwater...

EXTREME shearography: High-speed shearography instrument for in-plane surface strain measurements during an impact event

This work presents the design and the latest experimental results on the surface strain measurements during an impact event obtained with the EXTREME high-speed shearography instrument. The shearography technique is used in this project to provide a quantitative measurement of the surface strain development at the first moments of the impact...

Hydrodynamics of wind-assisted ship propulsion verification and validation of RANS methodology

Wind energy as an auxiliary form of propulsion for commercial ships has again become of great interest as a possible response to volatile fuel prices and increasingly stringent environmental regulations. A well-founded performance prediction tool is a key prerequisite for the further development of this promising technology, and with the support...

On the physical mechanisms for the numerical modelling of flows around air lubricated ships

Air lubrication techniques are very promising in reducing ship drag. It has been demonstrated that air cavity applications can realise propulsive power reduction percentages of 10-20% due to the reduction of the frictional resistance [1, 2]. However, a complete understanding of the two-phase flow physics involved with air cavity flows is still...

Validation of a simple aerodynamic model capable to predict the interaction effects occuring between two generic wind propulsion systems

In recent years wind-assisted propulsion for commercial ships has gained an increasing interest as valuable alternative to reduce fuel pollutant emissions. However, the development of feasible and commercially viable wind propulsion systems to partially (or fully) propel a ship is nowadays hindered by the difficulties of modelling the...

An analysis method to evaluate the added resistance in short waves considering bow wave breaking

A bow wave breaking is one of the most prominent factors to be considered regarding the nonlinearity of added resistance for a ship. Considering the stability of the bow wave breaking, which is mostly influenced by the ship speed and the waterline entrance angle, can enhance understanding of the nonlinearity. Understanding of the nonlinearity...

The application of particle image velocimetry for the analysis of high-speed craft hydrodynamics

The particle image velocimetry (PIV) technique has become a reliable method for capturing the velocity field and its derivatives, even in complex flows and is now also widely used for validation of numerical codes. As the imaging system is sensitive to vibrations, the application in environments such as towing tanks makes it a challenging task....

Computational modeling of impact damage in laminated composite plates

Self-healing of impact damage in 3d micromolecular composites

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Adapted processing routes for self-healing fibre-reinforced composites

Fibre-reinforced polymers development has been driven by the need for materials that combine high stiffness and low density, but composites based on thermoset matrices tend to remain sensitive to damage, that may occur early in the matrix. Improved efficiency could be gained by integrating functionalities into the structure, namely a self...

Towards a Framework to Analyze Causal Relations From Digital Information Networks To Micro Economic Productivity

Digital Information Networks (DINs) refer to information networks supported by telecommunication infrastructures and terminated by microprocessors. In the recent past, there is a consolidated recognition that the public digital network infrastructure is of high economic importance, being generally recognized as one of the pillars of the...