Fundamental numerical studies of thermal stratification effects in idealized urban areas: Weakly unstable thermal stratification effects on the elongated roll-structures downstream of a high-rise building, and its potential effect on pollutant dispersion in urban areas

Pollution in urban environments is increasingly becoming a major concern for our societies which, together with the increasingly powerful capabilities provided by computational fluid dynamics (CFD), has made pollution dispersion a common topic of research during the last two decades. Several factors are relevant to the dispersion of pollutants...

Developer-Friendly Test Cases: Detection and Removalof Unnecessary Casts

Test-cube is a tool that focuses on developer-friendly test amplification. Test amplification is a technique to improve a test suite by generating new tests based on manually written ones. Currently, these generated tests contain much redundant casting. Our study aimed to improve the readability of these generated test cases by reducing...

Between the Museum as City and City as Museum

Despite the museum playing a central role in society as public centre of collective memory, artefacts are dogmatically presented in highly introverted "white cubes". In response, the<i> Leiden Civic Museum</i> relies on a strong relationship between "content" and "context" in order to both reassure its collection of societal relevance, as well...

Improving Work-From-Home Satisfaction During COVID-19: Helping homeworkers manage work and family together for better work-from-home satisfaction.

This project deals with the creation of mechanisms for self-assessment in work-from-home (WFH) environments to enhance people's satisfaction. The core of the project lies in increasing WFH satisfaction by incorporating self-experimenting into work and family activities. This relies on the determinants of satisfaction and how homeworkers relate...

Unravelling the sediment transport mechanisms in an artificial lagoon: Multi-modal sand transport analysis at the hard flood defence of Maasvlakte 2

The port of Rotterdam was full and new mooring locations were required to host the largest ships in the world. And if there’s no space to expand on land, why not create land in the sea? That is exactly what The Netherlands did by creating Maasvlakte 2. The construction of Maasvlakte 2 started in 2008 and was officially completed on May 22nd ,...

Rear-Slope Revetment Stability Approached by the Wave Overtopping Simulator: Experiments Regarding the Stability of Single-Layer Cube Revetment on Breakwater Crests and Rear Slopes

Contrary to a breakwater outer slope, rear-slope revetment does not have to withstand breaking waves. However, generally, an equal dimensioned revetment is used on both the inner- and outer slope. Although with low-crested breakwaters severe overtopping occurs, the application of similarly sized armour on both sides still results in an over...

Laboratory experiments on the stability of concrete cubes: a comparison of testing methodologies

An important step in the design process of breakwaters is the laboratorial tests which show the performance of the breakwater. One of the important aspects in the performance is the stability of the armour layer. A common methodology for breakwater testing is a method in which the design wave conditions are simulated in four steps of 1000 or...

Rocking Revisited 1: Rocking of a Singe Cube on a Breakwater Slope

Prototype single layer armour units on a breakwater slope are observed to break. To predict when breakage occurs, the objective of this research project is to obtain knowledge on, and measurements of the rocking behaviour and failure mode of single layer armour units. A single cube on a breakwater slope is subjected to investigations. An...

Evaluation of the ESReDA Cube Method for the Aviation Sector

Nowadays accident analysis tools focus on finding the cause of an accident so that lessons can be learned. The ESReDA Cube method is designed to explore a new field in accident analyses. It focuses on the next step, namely analysing the lessons learned out of an accident. It is checked if they are sufficient and if they caused any change(s)....

Evaluation of concrete armour units used to repair damaged dolos breakwaters

Richards Bay Port, located in the East Coast of South Africa, was built during the 1970s. Two rubble mound breakwaters were constructed to protect the deep-water entrance channel and create a sheltered area for the vessels. Since the completion of these breakwaters in 1976, they have withstood several major storms, including cyclones that have...

A proposition for the new United Nations Environmental Council

De United Nations Environmental Council is een nieuwe autoriteit op het gebied van kennis over duurzame ontwikkeling. Het gebouw, in de tuin van het huidige VN hoofdkwartier, is een monolithische kubus op een verlaagd plein, beiden vervaardigd van Manhattan Schist. Een materiaal uit de bodem van Manhattan dat een restproduct is van de nieuwe...

Stability of a single top layer of cubes

In an attempt to reduce the cost of breakwaters, several elements have been developed. Examples are Accropodes, Tetrapods and concrete cubes. Previous tests were performed with armour layers consisting of a double layer of cubes. This study is based on a single layer of cubes. The great benefit of a single layer of cubes is that it reduces the...

Milleniumdoelen toepassen in game development: De weg naar Microsoft's Imagine Cup

Beat³ is een computerspel voor alle leeftijden, waarbij de speler woorden moet vinden in een woordveld en deze zo snel mogelijk moet selecteren. Omdat dit spel voor de Game Development competitie van Microsoft's Imagine Cup is gemaakt, zijn de acht millenniumdoelen verwerkt in het spel en heeft deze een sterk educatieve waarde. Daarnaast is een...

Invloed van plaatsingsdichtheid op de stabiliteit van 'armour layers' van golfbrekers

Door de jaren heen is er veel onderzoek gedaan naar golfbrekers en de stabiliteit van de 'armour layer'. Hieruit is gebleken dat de plaatsingsdichtheid van de 'armour layer' elementen een belangrijke parameter is. De doelstelling van dit onderzoek is om inzicht te verkrijgen in de invloed van de plaatsingsdichtheid op de stabiliteit van kubussen...

Golfbrekers met een enkele toplaag

Na analyse van de resultaten van de modelproeven zijn de volgende criteria voor Tetrapoden in een enkele toplaag bepaald: Bezwijken Ns=1,2; Start van Schade Ns=1,2 Geen Schade Ns=0.8. Ns is hierbij het schadegetal (golfhoogte gedeeld door relatieve dichtheid en blokdiameter) Na vergelijking van deze criteria met de ontwerpformule voor Tetrapoden...