Over de waarde van een gebruikersonderzoek

Het opzetten en uitvoeren van een gebruikersonderzoek blijft altijd spannend. Hoe pak je zoiets aan en wegen de inspanningen en kosten wel op tegen de resultaten? En wat doe je vervolgens met die resultaten? Janneke van Zelst en Gusta Drenthe evalueren het gebruikersonderzoek in de vorm van een websurvey zoals dat recent werd uitgevoerd bij de universiteitsbibliotheek van de Erasmus Universiteit Rotterda

Development of atypical parental behavior during an inpatient family preservation intervention program

Since failed reunification is a detrimental outcome for children, particularly infants and toddlers, the aim of this study was to gain insight into support to families in multiple-problem situations to help them achieve sustainable good-enough parenting. Therefore, we examined outcomes of an assessment-based inpatient family preservation program. We prepared a thorough target-population description (n = 70) using file analysis. Next, we examined atypical parental behavior during the intervention using the Atypical Maternal Behavior Instrument for Assessment and Classification with a repeated measures design (n = 30). The family files revealed a great number of issues at the family, parent, and child levels, such as practical matters, problems in parent functioning and between parents, and difficulties in the broader environment. We found a significant decline in three dimensions of atypical parental behavior over time. This program has great potential in supporting vulnerable families in their pursuit of family preservation

Topology of phospholipids in rod disk membranes

Contains fulltext : mmubn000001_006482171.pdf (publisher's version ) (Open Access)Promotores : F. Daemen en S. Bontingxiii, 121 p

Topology of phospholipids in rod disk membranes

The dominant narrative dealing with crimes of violence against Muslim women in both the Europe and the Middle East employs strikingly similar strategies, motifs, and symbols, especially when it comes to the issue of rape. Such similarities beg the question: to what extent is the discourse on rape part of the problem of acts of violence against women

SOLSTICE: Small Orbital Launch Systems, a Tentative Initial Cost Estimate

Small rockets have the potential to play an important role in the changes that are now occurring in the spaceflight domain. Currently, satellite miniaturization is opening up new possibilities to form constellations capable of full-time global coverage for internet service, real-time earth observation applications, and disaster monitoring. Such programs involving small satellites require low-cost and frequent access to orbit. A new class of launch vehicles is uniquely positioned to offer these small satellites dedicated access to space, with no restrictions on target orbit height or inclination traditionally associated with current rideshare arrangements. A number of new launch service providers has stepped up to this challenge, developing systems with decreased size and payload capability in a commercial way. Their offerings are priced lower than costs traditionally associated with a rocket launch. However, most of these firms do not have hardware in production yet, so the question arises whether or not these early price quotes are realistic with respect to the actual costs incurred. This research has made a first step towards answering this question, by developing a way to estimate costs for such systems in partnership with the European Space Agency’s Cost Engineering Section. All aspects of the estimating process were addressed, from gathering and selecting data, to building Cost Estimating Relationships, detailing cost-risks, and employing existing - and developing new - parametric relationships, whilst exploring their applicability to systems that have a lower payload capacity and gross lift-off weight than traditionally larger rockets. An early phase parametric cost estimate was synthesized with which it is now possible to approximate for commercial liquid and solid propellant rockets in the 100-700 kg payload range the development, production and operating costs, and their cost-based price per flight to within 20% of reported costs. By doing so at an equipment-level depth, novel contributions to theory could be made by adapting the Theoretical First Unit T1method of estimating,mirroring the reductions in cost achieved by commercial launch operators through profit retention and reduced subcontractor management effort. Whilst exploring these new launch vehicles’ costs, it was also discovered that small rockets in particular require a launch rate of over 4 per year to keep program commercialization expenses fromcausing up to a threefold increase in launch prices. An ESA liquid methane vehicle concept was central to the estimate; it was however concluded that this rocket ineffectively addresses the LEO market at a price point that is too high to gainmarket share. Nonetheless, other future proposals for small launch systems can now be evaluated for their cost feasibility, either by potential investors or agencies seeking shared technology development with commercial partners.Aerospace EngineeringSpace Engineerin