Introductie van een Speciale Editie met papers geselecteerd van het Euprera congres in Praag 2023
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In times of stability, it is relatively easy – or so it seems – to educate students for a ‘known’ future. My argument in this chapter is that we live in a time of multiple transitions (Rotmans, 2015), multiple crises (Capra & Luisi, 2014; Wahl, 2016; Sayer, 1994; Harvey, 2000; Jessop, 2012) and an unknown future. We are heading for an unknown future which, because of climate change, in its two extremes may either end in complete destruction or may be shaped by a shift towards a new sustainable balance: either a breakdown or a breakthrough (Wahl, 2016). Turbulent times tend to be fertile podia for a wide array of narratives that seek to make sense of the crisis, and which present imaginaries about the future. According to Jessop (2002), capitalism develops in a sequence of spatio-temporal fixes that each end in a crisis and then lead to competing narratives. This chapter claims that it is important for the educational community – and for society at large – to develop sufficient critical language awareness in order to be able to both critically analyse and evaluate existing narratives. In addition, it is important to be able to articulate our own narratives so as to be empowered to participate in this process of imagining and co-creating the future (Kress, 2000; Harvey, 2000).
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Wind turbines are usually clustered in wind farms which causes the downstream turbines to operate in the turbulent wakes of upstream turbines. As turbulence is directly related to increased fatigue loads, knowledge of the turbulence in the wake and its evolution are important. Therefore, the main objective of this study is a comprehensive exploration of the turbulence evolution in the wind turbine’s wake to identify characteristic turbulence regions. For this, we present an experimental study of three model wind turbine wake scenarios that were scanned with hot-wire anemometry with a very high downstream resolution. The model wind turbine was exposed to three inflows: laminar inflow as a reference case, a central wind turbine wake, and half of the wake of an upstream turbine. A detailed turbulence analysis reveals four downstream turbulence regions by means of the mean velocity, variance, turbulence intensity, energy spectra, integral and Taylor length scales, and the Castaing parameter that indicates the intermittency, or gustiness, of turbulence. In addition, a wake core with features of homogeneous isotropic turbulence and a ring of high intermittency surrounding the wake can be identified. The results are important for turbulence modeling in wakes and optimization of wind farm wake control
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English Abstract:Administrative turbulence in social work: the challenge of pluralist coalition-formation As elsewhere in Europe, social work in the Netherlands is facing ever more administrative changes. This article analyzes the administrative changes that local social work institutions are currently facing and how representatives of these institutions are reacting to these changes. The article is divided into three sections. The first section describes four administrative changes that organizations in the field of social work are currently facing. The second section is based on the results of four studies in local social work, and analyzes how social workers and managers from these organizations are experiencing and handling these administrative changes. We group the reactions into four different clusters: the confused reaction, the introvert reaction, the extravert reaction and the binding reaction. The third section zooms in on what we see as the most beneficial strategy: the binding reaction. We argue that these turbulent times call for organizations that are able to create strong coalitions, both internally and externally. These are necessary to guarantee service provision as well as innovation in a meaningful way.--Dutch Abstract:Bestuurlijk turbulentie in het sociaal werk: de uitdaging van meervoudige coalitievorming Net als elders in Europa wordt het sociaal werk in Nederland geconfronteerd met indringende bestuurlijke veranderingen. In dit artikel analyseren wij met welke bestuurlijke veranderingen instellingen in het lokaal sociaal werk te maken hebben en hoe representanten van deze instellingen op deze veranderingen reageren. Het artikel bestaat uit drie delen. In het eerste deel beschrijven we vier in het oog springende bestuurlijke veranderingen waarmee organisaties in dit veld geconfronteerd worden. In het tweede deel analyseren we op basis van verschillende onderzoeken in het lokaal sociaal werk hoe representanten van deze organisaties – sociaal werkers en managers – deze veranderingen ervaren en hoe zij hiermee omgaan. We onderscheiden vier clusters reacties: de verwarde reactie, de introverte reactie, de extraverte reactie en de verbindende reactie. In het derde deel zoomen we in op de ons inziens meest vruchtbare reactiewijze: de verbindende reactie. We betogen dat deze turbulente tijd vraagt om organisaties die erin slagen om zowel sterke interne als krachtige externe coalities te creëren, nodig om de kwaliteit van de dienstverlening te waarborgen en betekenisvol te innoveren.
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During the recent FMANZ Summit in Auckland we discussed the role of innovative suppliers and green procurement.Our one-hour workshop with 20-odd FMANZ professionals and managers started with the notion that we live in turbulent times with lots of changes (Rotmans e.a., 2012).
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A culture change within an organization may be of importance in this turbulent world. An assessment of the current and desired cultural profiles can help estimate as to whether any changes are required. In this study the organizational culture of a housing association was examined from both the staff’s and external stakeholders’ perspectives. How does the current culture compare with the desired culture? Do the external stakeholders perceive the organization’s culture in a similar way? Do the staff’s and external stakeholders’ perceptions coincide with the organization’s intended image? The results demonstrate that the external stakeholders’ perceptions of the organizational culture in this case study are similar to those of the organization’s staff.
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The environment of the(Dutch) building industry is increasingly turbulent. There are many cges for the building industry. Innovative tendering, better marketing, openness and transparency are examples of this. A strong reduction in failure costs (estimated at between 10 and 25% of the total costs) and an increase in quality are also necessary. Lastly, the declining inflow of young people has to be mentioned. The image of the building industry is not particularly good and students prefer to choose other industries. The building industry therefore has to change and, so far, everyone agrees. Evidently both the building industry and its environment are very keen to change; the sincere will is there, and money and energy are available, but it seems that efforts are not proceeding in a very planned or coordinated manner at present. And this is causing fragmentation and, therefore, sub optimisation. How does sectoral change proceed and how is this process to be managed? That is the central question in this paper.
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tract Micro wind turbines can be structurally integrated on top of the solid base of noise barriers near highways. A number of performance factors were assessed with holistic experiments in wind tunnel and in the field. The wind turbines underperformed when exposed in yawed flow conditions. The theoretical cosθ theories for yaw misalignment did not always predict power correctly. Inverter losses turned out to be crucial especially in standby mode. Combination of standby losses with yawed flow losses and low wind speed regime may even result in a net power consuming turbine. The micro wind turbine control system for maintaining optimal power production underperformed in the field when comparing tip speed ratios and performance coefficients with the values recorded in the wind tunnel. The turbine was idling between 20%–30% of time as it was assessed for sites with annual average wind speeds of three to five meters per second without any power production. Finally, the field test analysis showed that inadequate yaw response could potentially lead to 18% of the losses, the inverter related losses to 8%, and control related losses to 33%. The totalized loss led to a 48% efficiency drop when compared with the ideal power production measured before the inverter. Micro wind turbine’s performance has room for optimization for application in turbulent wind conditions on top of noise barriers. https://doi.org/10.3390/en14051288
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Net als elders in Europa wordt het sociaal werk in Nederland geconfronteerd met indringende bestuurlijke veranderingen. In dit artikel analyseren wij met welke bestuurlijke veranderingen instellingen in het lokaal sociaal werk te maken hebben en hoe representanten van deze instellingen op deze veranderingen reageren. Het artikel bestaat uit drie delen. In het eerste deel beschrijven we vier in het oog springende bestuurlijke veranderingen waarmee organisaties in dit veld geconfronteerd worden. In het tweede deel analyseren we op basis van verschillende onderzoeken in het lokaal sociaal werk hoe representanten van deze organisaties – sociaal werkers en managers – deze veranderingen ervaren en hoe zij hiermee omgaan. We onderscheiden vier clusters reacties: de verwarde reactie, de introverte reactie, de extraverte reactie en de verbindende reactie. In het derde deel zoomen we in op de ons inziens meest vruchtbare reactiewijze: de verbindende reactie. We betogen dat deze turbulente tijd vraagt om organisaties die erin slagen om zowel sterke interne als krachtige externe coalities te creëren, nodig om de kwaliteit van de dienstverlening te waarborgen en betekenisvol te innoveren.
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Small urban water bodies, like ponds or canals, are often assumed to cool their surroundings during hot periods, when water bodies remain cooler than air during daytime. However, during the night they may be warmer. Sufficient fetch is required for thermal effects to reach a height of 1–2 m, relevant for humans. In the ‘Really cooling water bodies in cities’ (REALCOOL) project thermal effects of typical Dutch urban water bodies were explored, using ENVI-met 4.1.3. This model version enables users to specify intensity of turbulent mixing and light absorption of the water, offering improved water temperature simulations. Local thermal effects near individual water bodies were assessed as differences in air temperature and Physiological Equivalent Temperature (PET). The simulations suggest that local thermal effects of small water bodies can be considered negligible in design practice. Afternoon air temperatures in surrounding spaces were reduced by typically 0.2 °C and the maximum cooling effect was 0.6 °C. Typical PET reduction was 0.6 °C, with a maximum of 1.9 °C. Night-time warming effects are even smaller. However, the immediate surroundings of small water bodies can become cooler by means of shading from trees, fountains or water mists, and natural ventilation. Such interventions induce favorable changes in daytime PET.
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