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World Café Insights: Combining Digital Technologies, Sustainability Goals, and Organizational Capabilities for Business Model Innovation
No full textOn the crustal composition of the Sardinia-Corsica continental block inferred from receiver functions
Get PDFSubduction-related geodynamic processes significantly influence plate tectonics and Earth's evolution, yet their impact on the continental crust remains poorly understood. We investigated the Sardinia-Corsica continental block, situated in the Mediterranean Sea, which has experienced intense subduction-driven geodynamic events. By analyzing P-wave receiver functions from our LiSard (Lithosphere of Sardinia) seismic network and publicly available stations, we aimed to understand crustal structure and composition. We inferred the Moho depth and examined the Pwave to S-wave velocity ratio (VP=VS). We interpret our findings considering petrological data, heat flux measurements, and other geophysical information. We found that the Variscan granitoid batholith has the greatest Moho depths in both Sardinia and Corsica. VP=VS ratios (ranging from 1.65 to 1.70) are consistent with average crustal values of SiO2 between 65% and 70 %. However, in central Corsica, two stations have exceptionally high VP=VS values (>1.80), suggesting the possible presence of serpentinite throughout the crust. In Alpine Corsica, a station exhibited similar high VP=VS values but a shallower Moho depth of 21 km. The western part of Sardinia, where Cenozoic volcanism occurred, also showed a shallower Moho depth (20-25 km) and high VP=VS values. The highest VP=VS value (1.91) is recorded in an area where surface-wave dispersion curves from ambient noise identified the lowest average S-wave velocity and where the highest heat flux has been reported. This suggests elevated crustal temperatures, although these values may also reflect the influence of thick Plio-Quaternary sedimentary deposits. Overall, our results indicate that recent geodynamic processes have left the granitoid batholith almost intact, with minimal alteration to its composition.</p
Development of a dashboard for management of saltwater intrusion in the Haringvliet Estuary
No full textIn support of neurodiverse participatory sensemaking
No full textThis paper asks how neurodiverse dyadic interactions may be supported by technologies, focusing on autistic children and their non-autistic others. Autism technologies often assume autism to be a social disorder that needs ‘fixing’, which we argue invalidates the experience of autistic sensemaking. Taking an enactive, participatory sensemaking perspective, paired with an ethics of neurodiversity; we investigated how to support neurodiverse participatory sensemaking. We contribute to research on ‘Diversity Computing’ technologies, which are envisioned to both respect and build connections between diverse ways of embodied sensemaking. In a Research-through-Design study, we confronted embodied theory with lived neurodiverse experiences, in interaction with our designed artifacts. Involving autistic children, teachers, (neurodivergent) dancers and music therapists, we iteratively designed and reflected on DiaDance: a system allowing autistic children and their non-autistic others to move together to adaptive music. Designing DiaDance helped understanding the ways in which interactive technology may support participatory sensemaking as self-organizing, intersubjective sensorimotor attunement. In this, each participant is invited to engage in the interaction ‘on their own terms’. Along with the prototype, we developed a set of interaction design principles, as well as outstanding challenges. In discussion, we identify three core conceptual reframings of understanding neurodiverse social interaction and how to design for it. These reframings reorient away from designing for instruction, representation and promoting social system level norms, and towards designing for scaffolding, attunement and intersubjective dialogue. With this work, we contribute to design that does justice to a diversity of sensemaking bodies, working towards a more neuro-inclusive society.</p
Assessing prolonged grief symptoms using experience sampling methodology:The development of the prolonged grief symptoms - short ecological assessment (PGS-SEA) scale
Get PDFEarly grief reactions have been hypothesized to fluctuate within persons and to be one of the strongest predictors of Prolonged Grief Disorder (PGD). Experience Sampling Methodology (ESM) offers an opportunity to examine (early) PGD dynamics in daily contexts. For this, however, a brief and valid ESM scale is needed to accurately assess PGD symptoms in everyday life. We investigated the psychometric properties of ESM items developed to assess momentary prolonged grief symptoms in daily life (ESM-PGD). Additionally, we aimed to create a valid brief scale for future ESM studies. Bereaved adults (N = 169) whose loved ones died 3–6 months earlier completed 11 ESM-PGD items based on 10 PGD symptoms, as defined in DSM-5-TR, five times a day for 14 consecutive days at semi-random intervals. We performed multilevel confirmatory factor analysis (MCFA), calculated root-mean-square of successive differences (RMSSD) and intraclass correlations (ICC), and conducted correlational analyses of ESM-PGD items with related mental health symptoms (e.g., depression) to identify the best-performing items. MCFA confirmed that the hypothesized one-factor model fits the data well with good composite reliability at the between- and within-person levels. All ESM-PGD items were able to distinguish between people with and without early PGD. Examination of within-person level factor loadings, ICCs and RMSSDs revealed that not all ESM-PGD items were able to capture fluctuations of momentary PGD symptoms. The best-performing items were selected, resulting in a valid 2-item Prolonged Grief Symptoms – Short Ecological Assessment (PGS-SEA) scale for assessing PGD in daily life to facilitate ESM-research on PGD.</p
A beam element with arbitrary active cross sections for multibody simulation of large-deflection flexure mechanisms
Get PDFDamping parasitic vibrations in flexure mechanisms can be achieved by integrating piezoelectric material in the flexures. Efficient models of such active flexures can aid in the design and optimization of such mechanisms to meet ever-increasing performance targets. In this paper, we present a novel beam element that is able to accurately and efficiently capture the large-deflection behavior of active flexures. The element combines a cross-sectional analysis based on the variational asymptotic method with the generalized strain beam formulation used in the multibody software SPACAR. The cross-sectional analysis converts an arbitrary active-section geometry to an asymptotically accurate equivalent beam model. This model is then used in the formulation of the geometrically nonlinear beam element. The element is validated against existing approaches and a challenging case study is presented, which shows that the element can be used to simulate complex active flexure mechanisms undergoing large deflection. The element is able to achieve results with a fraction of the computational effort required by a 3D finite-element package, with only a minor decrease in accuracy.</p
Dynamic error budgeting based robust system and control co-design for active vibration isolation systems
No full textThis paper proposes a novel method to optimize active vibration isolation systems based on H2-criteria using the dynamic error budgeting framework and H∞ constraints to guarantee robust stability. This method explicitly takes into account all noise sources and disturbances present in active vibration isolation systems. The dynamic error budget is interpreted as an H2 optimal control problem with a specific set of input weighting functions, that are models of the input signal spectra. This is extended with H∞ constraints to guarantee stability robustness of the controller. The constrained optimization problem is solved in a structured control setting, with a non-smooth sub-gradient descent method. This is used to optimize the controller and system parameters simultaneously. First an explorative study is done for a single axis active vibration isolation system, and it is shown that the performance improves significantly relative to a passive vibration isolation system and a benchmark active vibration isolation system. The optimal control formulation is thereafter applied to an experimental system, and performance improvements are obtained by a factor 2.3–4.1 in internal deformation power, and 2.9–13.7 in sensitive payload acceleration power with respect to the previous controller based on engineering intuition.</p
Sociale veiligheid en risicobeheersing in de georganiseerde sport:Een verantwoordelijkheid van het gehele systeem
Get PDFOn Categories of Nested Conditions
Get PDFNested conditions are used, among other things, as a graphical way to express first order formulas ruling the applicability of a graph transformation rule to a given match. In this paper, we propose (for the first time) a notion of structural morphism among nested conditions, consistent with the entailment of the corresponding formulas. This reveals a structural weakness of the existing definition of nested conditions, which we overcome by proposing a new notion of span-based nested conditions, embedding the original ones. We also introduce morphisms for the latter, showing that those form a richer structure by organising the various models in a number of categories suitably related by functors