Relationship archetypes in aftermarkets#

Aftermarket sales and profits have become an increasingly important part of an Original Equipment Manufacturer’s (OEM) business model. The attractiveness of the after-sales business, however, has also been recognised by other parties (e.g. competitors, suppliers) who try to capture a share of the aftermarket. A highly profitable aftermarket creates a strong incentive for the supplier to disintermediate the established supply chain and sell directly to the OEM’s aftermarket customers. To counter this threat, OEMs must be aware of the activities and actors on their aftermarket, and should understand and systematically analyse the existing or changing business relationships among the incumbent and emergent actors in the aftermarket ecosystem. In this exploratory study we use case study research with 29 companies (customer, OEM, supplier, or competitor) and draw on social network theory – in particular the concepts of structural embeddedness, structural hole and supply chain disintermediation – to examine and discuss triadic and tetradic relationship constellations (archetypes) in aftermarkets. Recognising these relationship archetypes in aftermarkets can help firms to adapt their after-sales strategies and protect the competitive advantage, revenues and profits stemming from their after-sales business.     

Organising and Managing boundaries: A structurational view of collaboration with Building Information Modelling (BIM)

The construction industry is currently undergoing digital transformation due to emerging technologies. Hence new forms of organisation are needed. Collaborating with Building Information Modelling (BIM) is complex and challenges the management of projects. The ubiquitous digital information sharing among multi-disciplinary actors in BIM-based projects, activates dense inter-organisational processes. This study offers insights into collaboration with BIM, through the theoretical lens of boundaries. By analysing two projects of BIM-based collaboration in the Netherlands, the interplay between structure and agency of collaboration was discussed. The various artefacts of BIM, as boundary objects were interpreted in multiple ways by different communities of practice and this resulted in poor communication and consequently poor collaboration. The findings challenge the prevalent view of BIM as a software artefact and showed that this view only partially supports collaboration. Additionally, a structurational view (enabled by communication, conflict management, negotiation, and teamwork) as opposed to a structural view of collaboration (e.g. BIM as a software) can fully support the implementation of digital innovations. Finally, the paper revealed a ‘tactical gap’ in the implementation of digital between strategic and operational decision-making needs fine-tuning to ensure better collaboration in projects where digital innovations are adopted. The study concludes with propositions for supporting organisation of teams through integration of activities and the management of BIM-based collaboration in projects beyond merely structural and technological approaches, which dominate the field but from a structurational view instead.     

A modal derivatives enhanced Rubin substructuring method for geometrically nonlinear multibody systems

Multibody System Dynamics - This paper presents a novel model order reduction technique for 3D flexible multibody systems featuring nonlinear elastic behavior. We adopt the mean-axis floating frame...     

Wood availability and habitat heterogeneity drive spatiotemporal habitat use by riverine cyprinids under flow intermittence

Interspecies and intraspecies variation in the use of wooded habitats has been studied for salmonids, but little is known about nonsalmonid species. In this study, we explored spatiotemporal differences in the distribution of three cyprinid species at habitats of varying wood density and at habitats of varying heterogeneity in a Mediterranean intermittent river (Evrotas, southern Greece). Hydroecological data from 843 microhabitats across four sites and in five sampling periods were collected and analysed using generalized linear mixed effects models. Adult chubs, minnowroaches, and minnows and, to a lesser degree, juvenile chubs, preferred complex, wooded habitats, characterized by lower flow velocities, higher water depths, finer substrate, and increased canopy cover, compared with wood‐free and noncomplex habitats. At the advanced stage of the dry period, the deeper, wooded habitats served as drought refugia; all fish groups, except for the adult chub, resorted to these habitats during autumn. In contrast, no such shifts were evident in early summer at the onset of the dry period. In late spring, all fish groups had higher densities at wooded habitats, a shift probably associated with reproduction. Wood density did not affect fish habitat use, as fish densities were similar across wooded habitats. In contrast, habitat heterogeneity significantly affected fish densities; more adult chubs and minnows were observed in complex habitats, whereas juvenile chubs and minnowroaches clearly preferred less complex habitats. We conclude that the targeted maintenance of instream wood structures to ensure habitat heterogeneity is a key‐action for the successful conservation of riverine fish populations.     

Co-designing reform-based online inquiry learning environments as a situated approach to teachers’ professional development

This study examined the contribution of a co-design approach to science teachers’ situated professional development, and explored its effect on student learning and motivation. Study participants were three science teachers who were members of a co-design team; one of the teachers enacted the designed learning environment with her 11th grade, non-science major students. Data were collected from 31 design meetings over two years, teacher interviews, and from pre-post student learning and motivation assessments. Findings indicated that the co-design approach addressed teachers’ reform-based professional development needs, had greater impact on the enacting teacher, and met the enacting students’ learning and motivation needs. The findings talk to the potential of co-design as a successful approach for teachers’ reform-based, situated professional development.     

Refractoriness in Poisson and Gaussian First-order Neural Nets with Chemical Markers

In this work first order probabilistic Poisson and Gaussian neural nets with chemical markers are investigated, analytically and by computer simulations. The investigation of steady-state behavior of these systems is extended here to systems in which the refractory period is assigned to be 1 for all or some of the subpopulations of the net, whereas the remainder are characterized by zero refractory periods. The interest is focused on the effects of refractoriness on the neural activities. Results obtained show the existence of several critical points at high initial activities, which are a consequence of the nonzero refractory periods. For these points a larger initial activity, above a certain critical level, results in the reduction of activity to a lower stable steady-state, instead of the highest one. We also find that in the Gaussian nets each critical point is lower than the corresponding one as in the Poisson nets. Finally, a discussion of the results is made.     

Modelling risk factors for injuries from dog bites in Greece: a case-only design and analysis

We conducted a study using a newly developed dataset based on Emergency Departments records of a network of hospitals from Greece on injuries from dog bites. Our goal is three-fold: (a) to investigate if surrogate factors of leisure time are associated with increased risk of injury from bites; (b) to address recently reported contradictory results on putative association of lunar periods and injuries from dog bites; and (c) to offer a general methodology for addressing similar case-only designs with combined factors of which some can exhibit cyclical patterns. To address these goals, we used a case-only design of our dataset, and conducted an analysis where we controlled simultaneously for weekday/weekend effects, season of year (winter, spring/fall, summer), and lunar periods, because any one of these factors can contribute to the degree of exposure to injuries from dog bites. We found that increased risk of injury from bites was associated with weekends versus weekdays (RR=1.19, 95% CI: 1.10-1.29), summer versus winter (RR=1.24, 95% CI: 1.11-1.39), and fall or spring versus winter (RR=1.31, 95% CI: 1.19-1.45). The results support the hypothesis that longer leisure time at these levels of factors does increase the risk of having a bite injury. Moreover, after controlling for these factors, risk of bite injury was not associated with moon periods, thereby also helping settle a longstanding argument.     

Ripening of Gloster 69 apples after low-ethylene storage

Preclimacteric Gloster 69 apples were stored for up to 200 days in 2 k Pa O₂ at 1·5°C with continuous ethylene removal. Fruit retained the ability to ripen normally after prolonged storage. In particular, synthesis of the aroma volatiles, 2-methyl butyl acetate and hexyl acetate, was not impaired. Ethylene at 15°C induced the synthesis of both aroma volatiles, the decrease in firmness and the increase in soluble pectin but simply accelerated the decreases in malate, starch and chlorophyll, whereas it showed no direct and consistent effect on sugar changes.