Using self-organizing maps to investigate environmental factors regulating colony size and breeding success of the White Stork (Ciconia ciconia)

We studied variations in the size of breeding colonies and in breeding performance of White Storks Ciconia ciconia in 2006–2008 in north-east Algeria. Each colony site was characterized using 12 environmental variables describing the physical environment, land-cover categories, and human activities, and by three demographic parameters: the number of breeding pairs, the number of pairs with chicks, and the number of fledged chicks per pair. Generalized linear mixed models and the self-organizing map algorithm (SOM, neural network) were used to investigate effects of biotic, abiotic, and anthropogenic factors on demographic parameters and on their relationships. Numbers of breeding pairs and of pairs with chicks were affected by the same environmental factors, mainly anthropogenic, which differed from those affecting the number of fledged chicks per pair. Numbers of fledged chicks per pair was not affected by colony size or by the number of nests with chicks. The categorization of the environmental variables into natural and anthropogenic, in connection with demographic parameters, was relevant to detect factors explaining variation in colony size and breeding parameters. The SOM proved a relevant tool to help determine actual dynamics in White Stork colonies, and thus to support effective conservation decisions at a regional scale

Solid intentions:an archival ethnography of corporate architecture and organizational remembering

Research on organizational spaces has not considered the importance of collective memory for the process of investing meaning in corporate architecture. Employing an archival ethnography approach, practices of organizational remembering emerge as a way to shape the meanings associated with architectural designs. While the role of monuments and museums are well established in studies of collective memory, this research extends the concept of spatiality to the practices of organizational remembering that focus on a wider selection of corporate architecture. By analyzing the historical shift from colonial to modernist architecture for banks and retailers in Ghana and Nigeria in the 1950s and 1960s on the basis of documents and photographs from three different companies, this article shows how archival sources can be used to untangle the ways in which companies seek to ascribe meaning to their architectural output. Buildings allude to the past and the future in a range of complex ways that can be interpreted more fully by reference to the archival sources and the historical context of their creation. Social remembering has the potential to explain why and how buildings have meaning, while archival ethnography offers a new research approach to investigate changing organizational practices

Children and Their Parents: A Comparative Study of the Legal Position of Children with Regard to Their Intentional and Biological Parents in English and Dutch Law

This is a book about children and their parents. There are many different kinds of children and at least about as many different kinds of parents. In addition to the many different disciplines that study children and their parents, such as sociology, psychology, child studies and gender studies, to name but a few, this study concerns a legal question with regard to the parent-child relationship, namely how the law assigns parents to children. This subject is approached in a comparative legal perspective and covers England and The Netherlands. The book contains a detailed comparison and analysis of the manner in which the law in the two jurisdictions assigns the status of legal parent and/or attributes parental responsibility to the child’s biological and intentional parents. The concept ‘procreational responsibility’, which is introduced in the concluding chapter of the book, may be used as a tool to assess and reform existing regulations on legal parent-child relationships. The structure of the book, which is based on a categorisation of different family types in a ‘family tree’, enables the reader to have easy access to family-specific information.FdR – Publicaties zonder aanstelling Universiteit Leide

Housing conditions in (cynomolgus) monkeys, a preference test

De huisvesting van laboratorium-dieren kan van invloed zijn op hun welzijn. Voor de evaluatie van huisvestingssystemen voor knaagdieren werd recent een preferentietest toegepast. De kooi waarin, bij vrije keuze uit een aantal, het langst wordt verbleven, wordt hierbij als de "beste" beschouwd. In dit rapport worden enkele waarnemingen bij een kooipreferentie onderzoek bij Java-apen beschreven. Er werd geen duidelijke invloed van wijziging in de kooiconstructie op de keuze van de apen gevonden. De keuze van de dieren voor verblijf in een van beide aangeboden kooien, werd primair bepaald door directe buurapen en secundair door verder verwijderde soortgenoten.VH

Panel survey city of Arnhem 2000 - VSO

Survey among inhabitants of the city of Arnhem Municipal services and the Internet / sports / city centre / local broadcasting company / opening public library at sunday Background variables: basic characteristics/ household characteristics/ place of work/ occupation/employment/ income/capital assets/ education/ social clas

Kiat sukses mahasiswa

iii, 139 p.; 21cm

Stadspanel Arnhem 2000 - VSO

Survey among inhabitants of the city of Arnhem Municipal services and the Internet / sports / city centre / local broadcasting company / opening public library at sunday Background variables: basic characteristics/ household characteristics/ place of work/ occupation/employment/ income/capital assets/ education/ social clas

Aerodynamic Performance of Wingtip-Mounted Propellers in Tractor and Pusher Configuration

Wingtip-mounted propellers are a promising solution for advanced propulsion integration on future (hybrid-)electric aircraft. Previous work has confirmed the favorable aerodynamic interactions between the propeller and the wing that occur for wingtip-mounted propellers in both tractor and pusher configuration. However, a direct comparison of the performance effects for the tractor and pusher configurations is unavailable in open literature. Moreover, the separate contributions of the propeller and wing forces to the overall system performance have not been sufficiently separated in previous studies. This paper presents the results of a wind-tunnel experiment performed at Delft University of Technology with a modular propeller-wing setup that addressed these knowledge gaps. A powered propeller model with a nacelle was installed at the tip of a cambered wing model. The nacelle could be reversed in order to change from tractor to pusher configuration. Measurements with an external balance quantified the system loading, while an internal balance provided a separate measurement of the propeller loading. The results highlight the differences between the interaction mechanisms for the tractor and pusher configurations. An assessment of the system performance showed that the pusher configuration required the lowest propeller shaft power to achieve a given system lift coefficient and net force coefficient in the flight direction. Power reductions of up to 9% were achieved compared to the tractor configuration for lift coefficients between 0.0 and 1.0 and net axial force coefficients between 0.00 (force balance in flight direction) and +0.08 (net positive force in flight direction).Correction: Aerodynamic Performance of Wingtip-Mounted Propellers in Tractor and Pusher Configuration Authors Name: Tomas Sinnige(1); Robert Nederlof(1); Nando van Arnhem(1) Authors Affiliations: 1. Delft University of Technology, Delft, Netherlands. DOI: https://doi.org/10.2514/6.2021-2511 Correction Notice The subcaptions of Fig. 4 are the wrong way around. Figure 4a depicts the pusher configuration, while Fig. 4b depicts the tractor configuration.Flight Performance and Propulsio