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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Studies among people with dementia demonstrated that the sleep quality and rhythm improves significantly when people are exposed to ambient bright light. Since almost half of the healthy older people also indicate to suffer from chronic sleep disorders, the question arises whether ambient bright light can be beneficial to healthy older people. Particularly the effect on sleep/wake rhythm in relation to the exposure to natural light is the focus. It was hypothesised that the sleep quality would be worse in winter due to a lower daylight dose than in summer due to the lower illuminance and exposure duration. A field study was conducted to examine the relationship between daylight exposure and sleep quality in 14 healthy older adults living independently in their own dwellings in the Netherlands. All participants were asked to take part of the study both during the summer period as well as during the winter period. Therefore, they had to wear an actigraph for five consecutive days which measured sleep, activity and light exposure. Results confirmed that people were significantly longer exposed to high illumination levels (>1000 lx) in summer than in winter. Sleep quality measures, however, did not differ significantly between summer and winter. A significant, positive correlation was found between exposure duration to high illuminance from daylight during the day and the sleep efficiency the following night in summer, implying that being exposed to high illuminance for a longer time period has a positive effect on sleep efficiency for the individual data. There was also a tendency of less frequent napping in case of longer exposure duration to light for both seasons. Sleep quality does not differ between summer and winter but is related to the duration of the exposure to bright light the day prior to the night. CC-BY Original article at http://solarlits.com/jd/5-14 http://dx.doi.org/10.15627/jd.2018.2 https://www.dehaagsehogeschool.nl/onderzoek/lectoraten/details/urban-ageing#over-het-lectoraat
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Spectral imaging has many applications, from methane detection using satellites to disease detection on crops. However, spectral cameras remain a costly solution ranging from 10 thousand to 100 thousand euros for the hardware alone. Here, we present a low-cost multispectral camera (LC-MSC) with 64 LEDs in eight different colors and a monochrome camera with a hardware cost of 340 euros. Our prototype reproduces spectra accurately when compared to a reference spectrometer to within the spectral width of the LEDs used and the ±1σ variation over the surface of ceramic reference tiles. The mean absolute difference in reflectance is an overestimate of 0.03 for the LC-MSC as compared to a spectrometer, due to the spectral shape of the tiles. In environmental light levels of 0.5 W m−2 (bright artificial indoor lighting) our approach shows an increase in noise, but still faithfully reproduces discrete reflectance spectra over 400 nm–1000 nm. Our approach is limited in its application by LED bandwidth and availability of specific LED wavelengths. However, unlike with conventional spectral cameras, the pixel pitch of the camera itself is not limited, providing higher image resolution than typical high-end multi- and hyperspectral cameras. For sample conditions where LED illumination bands provide suitable spectral information, our LC-MSC is an interesting low-cost alternative approach to spectral imaging.
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There has probably never been such an intense debate about the layout of the countryside as the one that is currently raging. There are serious concerns about the landscape, which is being rapidly transformed by urbanization and everything associated with this process, and not only in the Netherlands but also far beyond its borders. Everyone has something to say in this society-wide debate, from local to national governments, from environmental factions to the road-user's lobby, and from those who are professionally involved to concerned private parties. In many cases it is a battle between idealized images and economic models, between agricultural reality and urban park landscapes, between ecological concerns and mobility. This issue of OASE explores the potential significance of architectonic design for transformation processes on the regional scale. Besides considering the instruments that are available to the designer to fulfil this task, the authors also consider how the design can exercise a 'positive' influence on such processes. The various contributions shed light on the potential significance of territory in contemporary design practice and offer critical reflection on the topical discourse that has evolved over recent years.
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This chapter revisits the concept of internationalisation at home in light of the COVID pandemic and also of experiences and ongoing discourses on internationalisation. These include how internationalisation at home relates to diversity, inclusion and decolonisation of curricula. It discusses how the COVID pandemic has led to increased attention to internationalisation at home but also that confusion about terminology and the desire for physical mobility to be available to students may lead us to return to pre-COVID practices, in which internationalisation is mainly understood as mobility for a small minority of students and internationalisation of the home curriculum is a poor second best. A component of this chapter is how Virtual Exchange and Collaborative Online International Learning (COIL) have moved into the spotlight during the pandemic but were already in focus areas well before. This will be illustrated by some recent developments in internationalisation at home, mainly from non-Anglophone, European and particularly Dutch perspectives.
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Thermal comfort -the state of mind, which expresses satisfaction with the thermal environment- is an important aspect of the building design process as modern man spends most of the day indoors. This paper reviews the developments in indoor thermal comfort research and practice since the second half of the 1990s, and groups these developments around two main themes; (i) thermal comfort models and standards, and (ii) advances in computerization. Within the first theme, the PMV-model (Predicted Mean Vote), created by Fanger in the late 1960s is discussed in the light of the emergence of models of adaptive thermal comfort. The adaptive models are based on adaptive opportunities of occupants and are related to options of personal control of the indoor climate and psychology and performance. Both models have been considered in the latest round of thermal comfort standard revisions. The second theme focuses on the ever increasing role played by computerization in thermal comfort research and practice, including sophisticated multi-segmental modeling and building performance simulation, transient thermal conditions and interactions, thermal manikins.
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We have developed an SI-traceable narrow-band tunable radiance source based on an optical parametric oscillator (OPO) and an integrating sphere for the calibration of spectroradiometers. The source is calibrated with a reference detector over the ultraviolet/visible spectral range with an uncertainty of <1%. As a case study, a CubeSat spectroradiometer has been calibrated for radiance over its operating range from 370 nm to 480 nm. To validate the results, the instrument has also been calibrated with a traditional setup based on a diffuser and an FEL lamp. Both routes show good agreement within the combined measurement uncertainty. The OPO-based approach could be an interesting alternative to the traditional method, not only because of reduced measurement uncertainty, but also because it directly allows for wavelength calibration and characterization of the instrumental spectral response function and stray light effects, which could reduce calibration time and cost.
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Wat is de beroepsidentiteit van sociaal werk, wat behoort zij te zijn? Sociaal werk wordt wel omschreven als een professie maar ook als een ambacht, vaak zonder duidelijk onderscheid tussen en wellicht zelfs door impliciete gelijkstelling van deze kwalificaties. Met behulp van de ideaaltypische benadering kan echter worden aangetoond dat deze twee typen beroepen niet alleen veel overeenkomsten delen maar ook op enkele punten fundamenteel van elkaar verschillen. Op basis van het werk van Freidson (2001) en Sennett (2008) kan worden aangetoond dat het ideaaltypische doel van professies het realiseren van een abstracte waarde (zoals rechtvaardigheid) is, terwijl ambachten gericht zijn op het manipuleren van concrete materialen (bijvoorbeeld steen). Bijgevolg zijn (enkel) professies beroepen met een morele identiteit. In alle zelfdefinities van sociaal werk is deze morele identiteit, deze humanitaire kern aanwezig (zie bv. IFSW, NVMW). Daarom moet sociaal werk worden beschouwd als een professie en niet als een ambacht. Dit is niet louter een academische discussie maar beïnvloedt bijvoorbeeld de positie van dit beroep in de samenleving, zoals aan de hand van de ministeriële richtlijnen betreffende Welzijn Nieuwe Stijl kan worden geïllustreerd.
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This review offers a detailed examination of the current landscape of radio frequency (RF) electromagnetic field (EMF) assessment tools, ranging from spectrum analyzers and broadband field meters to area monitors and custom-built devices. The discussion encompasses both standardized and non-standardized measurement protocols, shedding light on the various methods employed in this domain. Furthermore, the review highlights the prevalent use of mobile apps for characterizing 5G NR radio network data. A growing need for low-cost measurement devices is observed, commonly referred to as “sensors” or “sensor nodes”, that are capable of enduring diverse environmental conditions. These sensors play a crucial role in both microenvironmental surveys and individual exposures, enabling stationary, mobile, and personal exposure assessments based on body-worn sensors, across wider geographical areas. This review revealed a notable need for cost-effective and long-lasting sensors, whether for individual exposure assessments, mobile (vehicle-integrated) measurements, or incorporation into distributed sensor networks. However, there is a lack of comprehensive information on existing custom-developed RF-EMF measurement tools, especially in terms of measuring uncertainty. Additionally, there is a need for real-time, fast-sampling solutions to understand the highly irregular temporal variations EMF distribution in next-generation networks. Given the diversity of tools and methods, a comprehensive comparison is crucial to determine the necessary statistical tools for aggregating the available measurement data.
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Deze literatuurstudie, geschreven als onderdeel van een vijftal studies naar verschillende fasen in het EU-beleidsproces, behandelt de fase van beleidsvorming door de Europese Commissie (EC). Hierin staat de vraag centraal wat de belangrijkste voorwaarden zijn voor effectieve beïnvloeding in deze fase van het EU-beleidsproces door EU-lidstaten en in het bijzonder door Nederland. In de literatuurstudie is met name literatuur tussen 2016 en 2023 behandeld, die op één of andere wijze kan bijdragen aan inzicht in de manier waarop actoren, en in het bijzonder lidstaten, invloed kunnen uitoefenen op beleidsvorming door de EC. De belangrijkste inzichten die volgen uit de literatuurstudie zijn: • Dat het effectief kan zijn om vroegtijdig een breed scala aan beleidsmakers en andere actoren, zowel nationaal als op EU-niveau, te betrekken bij een gestructureerde en gecoördineerde inzet om beleidsformulering te beïnvloeden. Hierbij zouden dan zo veel mogelijk EU-niveau actoren, zoals koepelorganisaties en implementatie-organisaties betrokken moeten worden. • Dat het een positief effect kan hebben op effectiviteit om zo veel mogelijk samen te werken als regering en oppositie in een eensluidend standpunt naar het EU-niveau, en ook samen te werken met regeringen en parlementen in andere lidstaten. • Dat voldoende menskracht, met name wat betreft coördinatie van inzet en contacten met zowel EC als Europees Parlement (EP), kan bijdragen aan een effectievere beleidsbeïnvloeding. Daarbij helpt het als nauw contact met vertegenwoordigers in expertgroepen wordt gehouden en zwaarder gekwalificeerde personen afgevaardigd worden, zodat zij in de groepshiërarchie binnen expertgroepen een leidende rol kunnen spelen. • Dat het effectief kan zijn om bij het bepalen van de boodschap en beïnvloedingsstrategie, in deze vroegtijdige fase, rekening te houden met de motivaties en belangen van (individuele ambtenaren binnen) de EC en andere lidstaten, en er een EU-wijd belang wordt gepresenteerd. • Dat strategisch nadenken over het proces en de keuzes rond consultatie-instrumenten effectiviteit zou kunnen vergroten Over veel thema’s kon geen uitsluitend wetenschappelijk onderbouwd antwoord gegeven worden vanuit de bestaande literatuur op dit moment, en is aanvullend onderzoek nodig om geïnformeerde uitspraken te kunnen doen over de rol van lidstaten en van Nederland in het bijzonder.
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