Semi-closed greenhouses have been developed in which window ventilation is minimized due to active cooling, enabling enhanced CO2 concentrations at high irradiance. Cooled and dehumidified air is blown into the greenhouse from below or above the canopy. Cooling below the canopy may induce vertical temperature gradients along the length of the plants. Our first aim was to analyze the effect of the positioning of the inlet of cooled and dehumidified air on the magnitudes of vertical temperature and VPD gradients in the semi-closed greenhouses. The second aim was to investigate the effects of vertical temperature gradients on assimilate production, partitioning, and fruit growth. Tomato crops were grown year-round in four semiclosed greenhouses with cooled and dehumidified air blown into the greenhouses from below or above the crop. Cooling below the canopy induced vertical temperature and VPD gradients. The temperature at the top of the canopy was over 5°C higher than at the bottom, when outside solar radiation was high (solar radiation >250 J cm-2 h-1). Total dry matter production was not affected by the location of the cooling (4.64 and 4.80 kg m-2 with cooling from above and from below, respectively). Percentage dry matter partitioning to the fruits was 74% in both treatments. Average over the whole growing season the fresh fruit weight of the harvested fruits was not affected by the location of cooling (118 vs 112 g fruit-1). However, during summer period the average fresh fruit weight of the harvested fruits in the greenhouse with cooling from below was higher than in the greenhouse with cooling from above (124 vs 115 g fruit-1).
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According to the critics of conventional sustainability models, particularly within the business context, it is questionable whether the objective of balancing the social, economic and environmental triad is feasible, and whether human equality and prosperity (as well as population growth) can be achieved with the present rate of natural degradation (Rees 2009). The current scale of human economic activity on Earth is already excessive; finding itself in a state of unsustainable ‘overshoot’ where consumption and dissipation of energy and material resources exceed the regenerative and assimilative capacity of supportive ecosystems (Rees 2012). Conceptualizing the current ‘politics of unsustainability’, reflected in mainstream sustainability debates, Blühdorn (2011) explores the paradox of wanting to ‘sustain the unsustainable, noting that the socio-cultural norms underpinning unsustainability support denial of the gravity of our planetary crises. This denial concerns anything from the imminence of mass extinctions to climate change. As Foster (2014) has phrased it: ‘There was a brief window of opportunity when the sustainability agenda might, at least in principle, have averted it’. That agenda, however, has failed. Not might fail, nor even is likely to fail – but has already failed. Yet, instead of acknowledging this failure and moving on from the realization of the catastrophe to the required radical measures, the optimists of sustainable development and ecological modernization continue to celebrate the purported ‘balance' between people, profit and planet. This is an Accepted Manuscript of a book chapter published by Routledge/CRC Press in "A Future Beyond Growth: Towards a Steady State Economy" on 4/14/16 ,available online: https://doi.org/10.4324/9781315667515 LinkedIn: https://www.linkedin.com/in/helenkopnina/
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Plant photosynthesis and biomass production are associated with the amount of intercepted light, especially the light distribution inside the canopy. Three virtual canopies (n = 80, 3.25 plants/m2) were constructed based on average leaf size of the digitized plant structures: ‘small leaf’ (98.1 cm2), ‘medium leaf’ (163.0 cm2) and ‘big leaf’ (241.6 cm2). The ratios of diffuse light were set in three gradients (27.8%, 48.7%, 89.6%). The simulations of light interception were conducted under different ratios of diffuse light, before and after the normalization of incident radiation. With 226.1% more diffuse light, the result of light interception could increase by 34.4%. However, the 56.8% of reduced radiation caused by the increased proportion of diffuse light inhibited the advantage of diffuse light in terms of a 26.8% reduction in light interception. The big-leaf canopy had more mutual shading effects, but its larger leaf area intercepted 56.2% more light than the small-leaf canopy under the same light conditions. The small-leaf canopy showed higher efficiency in light penetration and higher light interception per unit of leaf area. The study implied the 3D structural model, an effective tool for quantitative analysis of the interaction between light and plant canopy structure.
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Scientific research from within and beyond academia continues to provide the justification and the knowledge for policy developments directed toward migration and integration governance. A proliferation of scholarship aims to study, pilot, and investigate the ‘best practices’ for facilitating integration, which is then taken up in advice to policy makers. Many authors have written about this science-policy nexus (Boswell 2009; Penninx, Garcés-Mascareñas, and Scholten 2005; Scholten et al. 2015; Verbeek, Entzinger, and Scholten 2015) These works have also engaged in critical reflection, problematizing this nexus and demonstrating how funding structures draw researchers not only into addressing short-term policy goals, but also into reproducing some of the essentialist worldviews that come with methodological nationalism (Wimmer and Glick Schiller 2002) and the ‘national order of things’ (Malkki 1995). Yet, the colonial legacies and dis/continuities of these logics in integrationism have not received much attention so far.The paper takes a critical lens on the implications of the science-policy complicity in reproducing colonial logics of ‘cultural distance’, based on perspectives and empirical research from different national (Netherlands and Switzerland) and supra-national (EU) contexts. We analyse texts which shape the civic integration programme in the Netherlands, the genealogy of the integration requirement to respect the values of the constitution in Switzerland, and the EU framework on migrant integration. This combined analysis brings forth the role scientists and knowledge producers play in (re)producing the colonial logics within integrationism, and their contributions to the regime of truth within which integration discourse operates. Throughout this article, we draw on examples from these different contexts to display that integration and its migranticized (Dahinden 2016) subjects are constructed through practices deemed as scientific or objective expertise, building on important work by Schinkel (2018) on integration research as “neocolonial knowledge production” and Favell’s (2022) critical reflections on integration indicator frameworks. As we demonstrate, the “idea of integration as an issue of cultural distance is rendered imaginable in and through colonial legacies and scientific practices from which policy draws legitimacy. We show how cultural distance is produced in the scientification of migrants’ assimilability in a ‘Western work ethic’, in measurement of migrants’ adherence to liberal values, and through constructions of integration drawing on social imaginaries of national and European identity. Importantly, we argue that by presenting this cultural distance as a product of objective, scientific processes of empirical observation, the notion of cultural distance is normalised and depoliticized, which ultimately legitimizes integrationism as a mode of governance.The present study builds on important contributions (by Schinkel 2017; Favell 2022; Korteweg 2017; Bonjour and Duyvendak 2017, and others) in attempting to destabilize the normalization of integrationism as the widely accepted mode of governance of ‘immigrant’ or ‘ethnic’ populations and their inherent and problematic ‘distance’. The content and structure of this summer school in post-colonial Amsterdam would allow us to continue our critical reflexive discussions to better understand the colonial logics at play and how they operate in multiple contexts and at multiple levels of governance, in and beyond integration
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Purpose – purpose of this article is to report about the progress of the development of a method that makes sense of knowledge productivity, in order to be able to give direction to knowledge management initiatives. Methodology/approach – the development and testing of the method is based on the paradigm of the Design Sciences. In order to increase the objectivity of the research findings, and in order to test the transferability of the method, this article suggests a methodology for beta testing. Findings – based on the experiences within this research, the concept of beta testing seems to fit Design Science Research very well. Moreover, applying this concept within this research resulted in valuable findings for further development of the method. Research implications – this is the first article that explicitly applies the concept of beta testing to the process of developing solution concepts. Originality/value – this article contributes to the further operationalization of the relatively new concept of knowledge productivity. From a methodological point of view, this article aims to contribute to the paradigm of the Design Sciences in general, and the concept of beta testing in particular.
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This article will discuss philosophical debates on economic growth and environmental sustainability, the role of management responsibility, and the risk of subversion to business as usual. This discussion will be framed using the concepts of Cradle to Cradle (C2C) and Circular Economy about sustainable production. The case study illustrating the danger of subversion of these progressive models discussed here is based on the assignments submitted by Masters students as part of a course related to sustainable production and consumption at Leiden University. The evaluation of the supposedly best practice cases placed on the website of the Ellen MacArthur Foundation or those awarded Cradle to Cradle certificate has led some students to conclude that these cases illustrated green-washing. Larger implications of identified cases of green-washing for the field of sustainable business and ecological management are discussed. “This is a post-peer-review, pre-copyedit version of an article published in 'Philosophy of Management'. The final authenticated version is available online at: https://doi.org/10.1007/s40926-019-00108-x LinkedIn: https://www.linkedin.com/in/helenkopnina/
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Lectorale rede
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Network Applied Design Research (NADR) made an inventory of the current state of Circular Design Research in the Netherlands. In this publication, readers will find a summary of six promising ‘gateways to circularity’ that may serve as entry points for future research initiatives. These six gateways are: Looped Systems; Extension of Useful Lifetime; Servitisation; New Materials and Production Techniques; Information Technology and Digitization; and Creating Public and Industry Awareness. The final chapter offers an outlook into topics that require more profound examination. The NADR hopes that this publication will serve as a starting point for discussions among designers, entrepreneurs, and researchers, with the goal of initiating future collaborative projects. It is the NADR's belief that only through intensive international cooperation, we can contribute to the realization of a sustainable, circular, and habitable world.
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This article explores cooperation between a commercial supermarket chain and an environmental non-governmental organization linking it to consumer perception of the “The Super Animals” collectable cards promotion initiative. The case study focuses on one particular joint project involving Animal Cards that was initiated by the supermarket Albert Heijn and the World Wide Fund for Nature in The Netherlands. Based on this case, environmental non-governmental organizations’ strategic choices in the context of contesting discourses of sustainability and consumption, as well as implications for environmental education, are addressed. This article combines three strands of the literature – on sustainable consumption, on strategic cooperation between commercial companies and environmental non-governmental organizations and on environmental education. It is argued that the Animal Cards initiative presents an ambiguous case by both attempting to enhance environmental awareness and promoting consumption, opening up questions about the value of such cooperative ventures to the objectives of environmental education. It is concluded that cross-sector partnerships have the potential to lead to improvements in corporate social responsibility and environmental awareness among consumers but simultaneously pose the danger of undermining the critical stance toward consumption. https://doi.org/10.1177/1469540514556170 LinkedIn: https://www.linkedin.com/in/helenkopnina/
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Sustainability is one of the most important challenges of our time. How can we develop prosperity, without compromising the life of future generations? Companies are integrating ideas of sustainability in their marketing, corporate communication, annual reports and in their actions. The concept of sustainability has more recently also been linked to project management. Studies show that considering sustainability should not be regarded a responsibility of just the project sponsor or executive, also the project manager has a strong influence on the sustainability aspects of a project. This paper explores the concept of sustainability and its impact on the competences of the project manager. The paper also reports an analysis of 56 case studies on the integration of the concepts of sustainability in the way organizations initiate, develop and manage projects. This study showed that the average level of sustainability consideration in the actual situation of 25.9%. For the desired situation, this score is almost 10 percent higher, showing an ambition to take sustainability more into consideration. The study also showed that the way sustainability currently is considered in projects, should be categorized as the traditional ‘less bad’ approach to sustainability integration and not a more modern social responsibility approach
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