Dreijen Regeneration Study: Professional Academy 2007

This year the students of the “Professional Academy”, a combined theory and design class in landscape architecture, elaborated on a vision on the campus “de Dreijen” in Wageningen. This campus will be left by the university within the coming decade, university functions mainly moving towards the new campus “de Born” in the North of the city. Their “research by design” study brought about very different visions, but they all reflected the main theories learnt about urban sustainability and ecolog

A Multistory Structure Concept

It is the objective of this thesis to investigate the feasibility of a multistoried structural concept in which the principal structural elements are hollow girders and chambered hollow columns. The scope will be directed towards the general conceptions, assumptions and design procedures for the system. Only such specific design of a particular example will be accomplished as is necessary to provide correlation and justification for the general assumptions. A detailed investigation and design is not intended since this thesis is oriented towards establishing a general concept not merely a particular example

Bifurcation at nonsemisimple 1: - 1 resonance

In this paper a description is given of the bifurcation of periodic solutions occurring when a Hamiltonian system of two degrees of freedom passes through nonsemisimple 1–1 resonance at an equilibrium. A bifurcation like this is found in the planar circular restricted problem of three bodies at the Lagrange equilibriumL 4 when the mass parameter passes through the critical value of Routh. Gegenstand dieses Artikels ist die Verzweigung periodischer Lösungen in Hamilton''schen Systemen mit zwei Freiheitsgraden beim Durchgang durch eine nicht-einfache 1–1-Resonanz an einem Gleichgewicht. Ein Beispiel ist das ebene restringierte Dreikörperproblem am Lagrange-PunktL 4, wenn die Masse durch den kritischen Wert von Routh hindurchgeht

Spontaneous Ratchet Effect in a Granular Gas

The spontaneous clustering of a vibrofluidized granular gas is employed to generate directed transport in two different compartmentalized systems: a "granular fountain" in which the transport takes the form of convection rolls, and a "granular ratchet" with a spontaneous particle current perpendicular to the direction of energy input. In both instances, transport is not due to any system-intrinsic anisotropy, but arises as a spontaneous collective symmetry breaking effect of many interacting granular particles. The experimental and numerical results are quantitatively accounted for within a flux model.Comment: 4 pages, 5 figures; Fig. 4 has been reduced in size and qualit

Ervaringen met intraveneus toegediend acyclovir bij ernstige herpesvirus infecties

Contains fulltext : 4333.pdf (publisher's version ) (Open Access

Losing Wallets, Retaining Trust? The Relationship Between Ethnic Heterogeneity and Trusting Coethnic and Non-coethnic Neighbours and Non-neighbours to Return a Lost Wallet

Contains fulltext : 168707.pdf (publisher's version ) (Open Access)The constrict claim that ethnic heterogeneity drives down social trust has been empirically tested across the globe. Meta-analyses suggest that neighbourhood ethnic heterogeneity generally undermines ties within the neighbourhood (such as trust in neighbours), but concurrently has an inconsistent or even positive effect on interethnic ties (such as outgroup trust). While the composition of the living environment thus often seems to matter, when and where remain unclear. We contribute to the literature by: (1) scrutinizing the extent to which ethnic heterogeneity drives down trust in coethnic neighbours, non-coethnic neighbours, unknown neighbours and unknown non-neighbours similarly; (2) comparing effects of heterogeneity aggregated to geographical areas that vary in scale and type of boundary; and (3) assessing whether the impact of heterogeneity of the local area depends on the wider geographic context. We test our hypotheses on the Religion in Dutch Society 2011–2012 dataset, supplemented with uniquely detailed GIS-data of Statistics Netherlands. Our dependent variables are four different so-called wallet-items, which we model through spatial and multilevel regression techniques. We demonstrate that both trust in non-coethnic and coethnic neighbours are lower in heterogeneous environments. Trust in people outside the neighbourhood is not affected by local heterogeneity. Measures of heterogeneity aggregated to relatively large scales, such as, administrative municipalities and egohoods with a 4000 m radius, demonstrate the strongest negative relationships with our trust indicators.28 p