165,633 research outputs found
Soil detritivore functioning in heterogeneously contaminated soils
No full textVerhoef, H.A. [Promotor]Berg, M.P. [Copromotor]Faber, J.H. [Copromotor
Economic evaluation of urban and spatial policies
No full textRouwendal, J. [Promotor]Verhoef, E.T. [Promotor
Surface energy balance of shrub vegetation in the Sahel
No full textRecently, the development and use of Global Circulation Models, employed for climate change prediction, has taken off. These models provide us with the current and future status of the surface, expressed by the surface energy and water balances. In order to obtain reliable climate-predictions there is an urgent need for reliable input data from all major biomes covering our Globe. The Sahel has been one of the most important areas of application for GCMs, in order to understand the reasons for its declining rainfall, a process that started in the early seventies. It is therefore of paramount importance to monitor the surface conditions of this vulnerable area, where drought and land use interact to create surface conditions able of altering the regional climate.This thesis describes the surface energy balance of Sahelian shrub vegetation (fallow savannah and tiger-bush) by using micrometeorological data obtained in the framework of the HAPEX-Sahel and SEBEX project. The surface energy balance defines how net radiation is partitioned over the atmospheric fluxes (sensible and latent heat flux) and the soil heat flux. The energy balance is studied on a diurnal, seasonal and interannual scale. In addition the CO 2 flux of savannah is described. The fallow savannah is part of a rotation scheme (usually millet) and consists of scattered shrubs (Guiera senegalensis) interspersed by a sparse undergrowth of grasses and herb species. The tiger-bush takes its name, when viewed from the sky, from the resemblance to a tiger skin. It is composed of elongated vegetation patches, mainly consisting of Guiera senegalensis with an occasional tree, growing on bare, crusted, practically impenetrable soil.To study the exchange between the (Sahelian) land surface and the atmosphere, various surface parameterizations have been developed. These soil-vegetation-atmosphere-transfer schemes (SVATs, in their simplified form being the basis of the large-scale models) require detailed input of surface parameters (e.g. albedo, roughness length for momentum, or soil thermal conductivity) and the resistances encountered by the fluxes. This thesis provides the various input parameters and surface and aerodynamic resistances of the savannah and tigerbush and their possible temporal variability. Various SVATs have been tested and it can be concluded that simple parameterizations of soil heat flux give results comparable to elaborate soil models. Of major importance are the surface resistances and the aerodynamic resistance describing the transport within the understorey. Simple relationships, in which the roughness length and the displacement height are characterized by canopy height only, do not work satisfactorily for these sparse canopies. They require a relatively detailed drag partition model, applying roughness density.If simple, one-layer, bulk transfer models are used (e.g. for remote sensing) the excess resistance has to be taken into account. It appears that the resistance for this shrub-dominated vegetation is much larger than the usually applied value
The impact of fatigue on daily activity in patients with Parkinson s disease
No full textKwakkel, G. [Promotor]Wegen, E.E.H. van [Copromotor]Verhoef, J. [Copromotor
Hendrik Verhoef en de gebroeders De Witt
No full textHendrik Verhoef, geboren te Woerden, later zilversmid in Den Haag, was een der voornaamste medeplichtigen aan de moord der gebroeders De Witt. Ten tijde van de moordpartij in 1672 was Hendrik schutter onder commando van J. de Zwart. Later was hij herbergier. Hij werd in 1677 veroordeeld tot openbare geseling en 50 jaar tuchthuis, ontvluchtte het tuchthuis en vestigde zich in Utrech
Aan de vergetelheid ontrukt (8) : Johannes Verhoef (1928-1948)
No full textJ. Verhoef werd geboren in de toenmalige gemeente Ruwiel (thans Nieuwer Ter Aa). Hij sneuvelde op 28 januari 1948 bij Lingapoera in Nederlands-Indië en is een van de gevallenen waarvan de naam vermeld staat op het gedenkteken in het Tinus de Witplantsoen te Breukele
[Report to Chief J. E. Curry, by an unknown author #1]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
[Report to Chief J. E. Curry, by an unknown author #2]
No full textReport to Chief J. E. Curry, by an unknown author. The report contains a list of officers who gave depositions to the United States Attorney
As-Kanaleneiland - Niels Stensencollege, gemeente Utrecht; archeologisch vooronderzoek: een bureau- en inventariserend veldonderzoek (proefsleuven ten behoeve van de Limesweg)
No full textOpdrachtgever:Kanaleneiland Centrum
Archeologisch onderzoek naar de Limes.
Coordinaten: 135.035/453.887
Datum einde onderzoek: 11-2008, rapportage:24-12-2009
Projectmedewerkers: P.J. Ilson MA, drs. B. Jansen, ing. J. van Roemburg, A.W. Verhoef, drs. K. Wink
Complextype(n): IWEG
Datering:PALEO-NTC
Diversen:Briels, I.R.P.M., As-Kanaleneiland/Niels Stensencollege, gemeente Utrecht; archeologisch vooronderzoek: een bureau- en inventariserend veldonderzoek (proefsleuven ten behoeve van
de limes-weg), RAAPrapport1863, (WEESP, 2009
Supplemental Material, PublicTransportMarketing_JPPM_18033_Final_WebAppendix - Moving Forward: The Role of Marketing in Fostering Public Transport Usage
No full textSupplemental Material, PublicTransportMarketing_JPPM_18033_Final_WebAppendix for Moving Forward: The Role of Marketing in Fostering Public Transport Usage by Maarten J. Gijsenberg and Peter C. Verhoef in Journal of Public Policy & Marketing</p
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