From the conference paper : "The authors examined how to improve the total (onsite and offsite) labour productivity of production and assembling of fast retrofitting concepts in the Netherlands. The authors analysed the collected data of two NetZero energy renovations in which the initial process were quite traditional. In the first case the labour productivity can increase spectacularly by prefabricating the roof. In the second case the providers modernized the process by working in multi-disciplinary teams. No evidence have been found that working in a multi-disciplinary team can increase the labour productivity but the time for realization did decrease."
The central research question in this study is: Which meaning is given to sustainability within a Dutch housing association and does making sense of the concept of sustainability lead to sustainable strategic choices? The chosen research strategy is a longitudinal case study in the Dutch housing association Welbions. Data was collected in three periods between 2009 and 2018. Welbions associates sustainability mainly with the financial position, costs and affordability, and interprets the concept as investment measures in energy savings, reducing the usage of gas and CO2-emissions which are aimed at in covenants. From the listed factors influencing strategic decision-making, the economic, technical and personal frames appeared to be used mostly. The organizational and ethical frame were used only once, and the aesthetic frame was not used at all. Noteworthy is that ecological developments were not mentioned. Frames derived from the decision criteria showed a dominating economic frame. Making sense of sustainability does not result in sustainability-based actions, or choice. This indicates that sustainable values have not gained a position in strategic decision-making, compared to traditional values such as cost-efficiency and affordability.
MULTIFILE
The explicit attention to sustainability and related concepts within the context of housing and urban development dates back to the 70’s of the last century. Since then, a lot of efforts have been done to define the concept and to bring it into practice. This involved efforts from national to local governments, to create the proper policy conditions, from commercial partners like developers, constructors, and housing corporations, to realise sustainable residential areas and houses, and from other partners like NGO’s and research institutes. And of course it involved efforts from residents, who lived in the (more) sustainable houses, experienced some benefits but sometimes also were confronted with disadvantages of their (more) sustainable houses. Certain successes were achieved, but the complete housing sector at this moment is still far from ‘sustainable’. The need for further improvement is getting bigger, both for environmental reasons and for reasons related to other dimensions of sustainable development, like for example social and economic quality.
MULTIFILE
Our mission is to increase the productivity of Dutch greenhouses. Even the most modern greenhouses still suffer from 10% to 25% loss of crop due to pests and diseases (Pimentel, 2012). Our autonomous flying platform can reduce crop loss by regular scouting while avoiding excessive cost of manual labour. With one drone we can scout one hectare of greenhouse per hour, providing detailed information about environmental parameters and crop health, quality and quantity. In comparison traditional manual scouting methods scout a single hectare per day. As a spin-off from RAAK.MKB006.017 HiPerGreen, we are aiming for a fast track solution to a single pest control problem: Fusarium in orchids, and validate a Minimum Viable Product for use in the Greenhouse.
The Ph.D. candidate will investigate the seismic response of connection details frequently used in traditional Dutch construction practice, specifically in the Groningen area. The research will focus on the experimental and numerical definition of the complete load-deflection behaviour of each considered connection; specifically, the tests will aim at identifying stiffness, strength, ductility, and dissipative behaviour of the connections. The experiments will be conducted on scaled or full-scale components that properly resemble the as-built and retrofitted as well connection details. The tests will involve monotonic and cyclic loading protocols to be able to define the load and displacement response of the connection to reversal loads, such as earthquakes, as well as the development of failure mechanisms under such loading cases. Possibly, also dynamic tests will be performed. Numerical models will be created and calibrated versus the experimental findings. Characteristic hysteretic behaviours of the examined connection types will be provided for the use of engineers and researchers.
