93 research outputs found
Tellen én meetellen: samen recht doen aan kinderen en gezinnen in de jeugdbescherming
No full textOratie uitgesproken door Prof.dr. Anouk Goemans bij de aanvaarding van het ambt van bijzonder hoogleraar Jeugdhulp en jeugdbescherming vanuit pedagogisch en juridisch perspectief aan de Universiteit Leiden op vrijdag 16 januari 2026FdR – Publicaties niet-programma gebondenEducation and Child Studie
Does peer victimization predict low self-esteem, or does low self-esteem predict peer victimization? Meta-analyses on longitudinal studies
No full textIn the current study two meta-analyses are performed on longitudinal studies on peer victimization and self-esteem. The goal of these meta-analyses was to analyze whether a low self-esteem predicts future peer victimization, or whether peer victimization predicts future low self-esteem. The databases PsycINFO, MEDLINE, and ERIC were searched for relevant literature. Two authors independently went through the retrieved articles and found four doctoral dissertations and 14 peer reviewed articles eligible for inclusion in the meta-analysis. Articles were independently coded by two authors, with good interrater agreement. A total of 16,230 youth were included in the meta-analysis on peer victimization and self-esteem, and a total of 16,394 youth were included in the meta-analysis on self-esteem and peer victimization. Significant prospective pathways were found from peer victimization to self-esteem, and from self-esteem to peer victimization, which suggests that peer victimization and self-esteem are related in a transactional manner. Analyses suggested a negligible role of publication bias in the obtained results. Moderator analyses revealed that effect sizes were smaller for studies that used peer reports, and for studies that considered longer time-spans. The results of the current study suggest that peer victimization could have long lasting negative effects on self-esteem, but also point out that children may become victims because of low self-esteem.Development Psychopathology in context: clinical setting
The development of children in foster care
No full textIn deze rubriek komt een promovendus aan het woord. Waar ging het onderzoek over? En wat hebben professionals eraan in de praktijk?Development Psychopathology in context: clinical setting
Mathematical modeling of pressurizer thermodynamics
No full textMechanical, Maritime and Materials Engineerin
Produktie van Ethylbenzeen door middel van katalytische destillatie
No full textDocument(en) uit de collectie Chemische ProcestechnologieDelftChemTechApplied Science
Maasvlakte II: Capaciteit natte infrastructuur. Beoordeling bij verschillende alternatieven
No full textCivil Engineering and Geoscience
Topology optimization of the compliant underactuated finger with the focus on out-of-plane stiffness
No full textFor large-displacement mechanisms, such as underactuated fingers, the out-of-plane stiffness can pose problems, especially as it tends to vary over the in-plane range of motion. In this paper a method is presented to design compliant underactuated fingers using topology optimization with a focus on obtaining a desired out-of-plane stiffness profile. Load path representation is used in combination with a non-dominated sorting genetic algorithm. Aside from the thickness of beam elements, the curve of a beam element is also employed as design variable. A set of objective functions is used to evaluate the behavior of the out-of-plane stiffness over the range of motion. The resulting Pareto solutions provide insight into the trade-off between the different objective functions on contact force and out-of-plane stiffness and also show the capability of this method to design compliant underactuated fingers. Using objective functions on out-of-plane stiffness results in solutions with a higher out-of-plane stiffness than when these objective functions were not used, while the solutions decrease little in performance in terms of contact force. The resulting shape of the out-of-plane stiffness over the in-plane range of motion is shown to vary per solution. It is also shown that using curved beam elements can have a positive effect on the out-of-plane stiffness. Experiments on an underactuated finger prototype verified the simulation results.BMDBioMechanical EngineeringMechanical, Maritime and Materials Engineerin
The Development of the Biogas Industry in South Africa: Strategic Niche Management in an African institutional context
No full textIn recent years, the renewable energy sector of South Africa has seen significant growth, but the biogas industry has been lagging behind. In this research, barriers and opportunities for the South African biogas industry have been studied while taking into account the institutional context that is created by informal networks. The research methodology consists of literature review, interviews with stakeholders of the South African biogas industry and three case studies of biogas projects in South Africa. In order to identify the barriers and opportunities that exist for the South African biogas industry, both the internal environment and external environment of the industry were considered. The barriers internal to the biogas industry were structured and analysed using Strategic Niche Management theory, whereas the external environment and its impact on the biogas industry was analysed from a Multi-Level Perspective. The regime that was considered is the fossil fuel based electricity regime of South Africa. From the empirical research it follows that the most strongly perceived opportunity for the South African biogas industry lies in the country’s current energy crisis, which has created a window of opportunity for renewable energy technologies. Furthermore, opportunities are created for the biogas industry through the increased environmental awareness and this is for instance seen from green policies and measures taken by companies and government to reduce carbon emissions. Three main conclusions were drawn regarding the barriers for the South African biogas industry. Firstly Biogas projects in South Africa are currently often found to be insufficiently financially feasible. This relates to the costs involved in the project, market conditions and a lack of funding opportunities. Secondly, the regulatory framework is not conducive to the development of biogas projects and this is forming a major barrier. Finally, the network of the South African biogas industry is not sufficiently internally aligned. This relates to both a lack of alignment within the government regarding a suitable legislative process and a lack of alignment within the network as a whole regarding the expectations for the industry. This research also aimed to contribute to the academic body of knowledge by considering the impact of informal networks on Strategic Niche Management. While this could not be derived conclusively from the empirical research, informal networks were recognized throughout this research and several impacts on Strategic Niche Management can be argued. Firstly, aligning the niche network towards a joint effort will be complicated by the division that is created by informal networks. Secondly, selecting projects for support is not based solely on project viability and value to the niche development as social relationships play a role in the informal institutional context. This makes it difficult to control the selection process though policy and is likely to impede learning processes.Technology, Policy and ManagementEthics / Philosophy of Technolog
Success Factors, Barriers, and Strategies in Experimental Development in Public-Private Partnerships
No full textPublic-private partnerships (PPP) that focus on innovation are excellent methods to improve the innovative capabilities of both partners, however, within the complex dynamics of this cooperation, literature and management would benefit from an analysis of barriers, success factors, and strategies employed within the PPP. This research can be used as a springboard for further research by analyzing a novel research setting: Defense Ministries and Defense Industries. This novelty was compounded by taking a qualitative, explorative approach. A focus on experimental development was taken to limit the large amount of innovative activity present in the sector. Focus was kept on the effects on individual projects, as opposed to innovation systems or networks. This leads to the following research question: What are the barriers and success factors in public-private partnerships that focus on experimental development, and how do the participants cope with the barriers, and utilize the success factors? From the literature a theoretical framework was set up based on four categories of factors influencing the innovation process. The categories are organizational, contextual, interaction-specific, and innovation-characteristic. Literature suggested that interaction-specific barriers were the main source of barriers. The main strategies in literature revolve around interaction-specific solutions to these interaction-specific barriers. A contextual model was set up. Dutch Ministry of Defence (MoD) and the Dutch Defense industry provided a novel research setting with hard-to-define innovation goals. Individuals from both sides of the PPP with practical experience in PPPs that focus on experimental development were interviewed. Within the Dutch MoD these were innovation coordinators within sub-organizations and within the Defense Industry these were leaders of small to medium-sized companies. The data was gathered through 13 interviews, of which 11 were used as sources of data. The data was first deductively coded through the four categories and then inductively coded based using the terminology of the interviewees. This coding strategy led to three organizational factors: ‘process rules’, ‘culture, vision & implementation’ and ‘scale-up’, five contextual factors: ‘procurement: general’ ‘procurement: prior knowledge’, ‘procurement: perception’, ‘privacy’ and ‘technology-related’, one innovation-characteristic factor: ‘uncertainty’ and three interaction-specific factors: ‘contact with end-user’, ‘shared understanding’ and ‘expectation management’. The factors were described as ‘barrier’, ‘success factor’, ‘strategy’, and ‘not a barrier’. Organizational and contextual factors were the main factors influencing the success of the innovation process. ‘Process rules’ was named the most influencing factor for the innovation process. ‘Procurement law’ was the most prominent contextual factor. Innovation-characteristic factors were often considered to not be relevant to the cooperative innovation process. Lastly, the interaction-specific factors were occasionally cited as a barrier and often named as a success factor, specifically ‘contact with end-user’. Interaction was key to most strategies employed to overcome barriers. In conclusion, this study has provided a unique insight into a collaborative phenomenon in a scarcely researched setting. The findings can be used in comparison with other research on PPPs with innovative goals, especially those that have taken place in the Netherlands. Compared to literature, the appearance of interaction-specific strategies is not unique, but in their broad application to overcome a plethora of barriers is. Further research focusing on communication dynamics within PPPs is recommended to enhance collaborative efforts and drive impactful innovations in the Defense sector. In a practical sense, reviewing process and contextual rules and reviewing the accessibility of the PPP to newcomers in the sector would enhance innovation programs, fostering effective collaboration between public and private entities.Management of Technology (MoT
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