Informatieanalyse beheerplannen: bijdrage beheerplannen aan de rapportageverplichtingen van LNV

Kort verslag en verantwoording van de werkzaamheden ten behoeve van het programma WOT Informatievoorziening Natuur. De werkzaamheden zijn uitgevoerd in de eerste helft van 2010. De EU lidstaten dienen namelijk verantwoording af te leggen aan de Europese Commissie door middel van rapportage

Advies over de kwaliteitsborging van de Monitor agenda vitaal platteland

Dit rapport betreft een advies over de kwaliteitsborging van de Monitor Agenda Vitaal Platteland. Hiervoor is onderzoek uitgevoerd naar kwaliteitsmanagement in de overheidssector en in de ICT-sector. De resultaten hiervan zijn gebruikt om te komen tot een herdefiniëring van de Monitor Agenda Vitaal Platteland en tot aanbevelingen voor de kwaliteitsborging van dit informatiesysteem. Trefwoorden: kwaliteitsmanagement, prestatiemanagement, goed openbaar bestuur, ICT kwaliteitmanagement, monitoring en evaluatie, plattelandsbelei

The abrupt development of penumbrae in sunspots

A sunspot is distinguished from a pore by having a filamentary penumbra, corresponding to convective motions that carry energy into the spot from the surrounding field-free plasma. A simplified model of energy transport in sunspots is developed in order to model the transition from pores to spots as the magnetic flux is varied. The observed overlap between the radii of large pores and small spots implies that the filamentary convective mode sets in suddenly and rapidly, as in the idealized case where pore solutions lose stability at a bifurcation

Development of analysis techniques for the use of aerial photography in the monitoring of intertidal mussel beds and oyster beds

This project aimed at improving the analysis techniques of aerial photography for mussel bed recognition and mapping. In this project two techniques were tested; recognition and mapping by human eye and recognition and mapping by automatic detection software. The detection with the human eye was tested in two ways. The first test considered recognition of mussel beds in an area were contours of the previous year were available. The second test concerned a blind recognition test without any knowledge on previous locations of mussel beds

C*-algebras associated with endomorphisms and polymorphisms of compact abelian groups

A surjective endomorphism or, more generally, a polymorphism in the sense of \cite{SV}, of a compact abelian group $H$ induces a transformation of $L^2(H)$. We study the C*-algebra generated by this operator together with the algebra of continuous functions $C(H)$ which acts as multiplication operators on $L^2(H)$. Under a natural condition on the endo- or polymorphism, this algebra is simple and can be described by generators and relations. In the case of an endomorphism it is always purely infinite, while for a polymorphism in the class we consider, it is either purely infinite or has a unique trace. We prove a formula allowing to determine the $K$-theory of these algebras and use it to compute the $K$-groups in a number of interesting examples.Comment: 25 page

The pre- and protohistoric togué of the Niger alluvial plain, Mali

The Inland Niger Delta in Mali is scattered with thousands of tell-like dwelling mounds that testify to the rich archaeological heritage of this attractive occupation area. Little is known about the structure and evolution of this considerable settlement system. The general aim of the present research was to obtain a better understanding of the history of occupation of this region. The aim of the regional survey in the southern part of the Niger alluvial plain was to obtain an understanding of intersite relations based on the sites’ chronological, functional, socioeconomic and hierarchical differentiation and their participation in different trade networks. The main foci of attention in the Dia excavation were the sites’ roles in the earliest colonisation of the southern Inland Niger Delta, the transition from the Late Stone Age to the Early Iron Age, the introduction of crop cultivation and pastoralism and the early urban development of the site and the region. The two datasets showed two different perspectives: the regional orientation of a survey and the site-specific depth of an excavation. Another interesting aspect of this approach is that it enabled comparison of finds recovered in an urban context with the results of a geographical survey of the rural hinterland.Part 2 is published titled "Recherches archéologiques à Dia dans le Delta intérieur du Niger (Mali) : bilan des saisons de fouilles 1998-2003" as part of the series "Mededelingen van het Rijksmuseum voor Volkenkunde (RVM) Leiden"; No 33. Research School of Asian, African, and Amerindian Studies, Leiden University. CNWS publications ; 144, 2005, ISBN 9789057891076LEI Universiteit LeidenPrehistoric farming communities in NW Europ

On the relationship between continuous- and discrete-time quantum walk

Quantum walk is one of the main tools for quantum algorithms. Defined by analogy to classical random walk, a quantum walk is a time-homogeneous quantum process on a graph. Both random and quantum walks can be defined either in continuous or discrete time. But whereas a continuous-time random walk can be obtained as the limit of a sequence of discrete-time random walks, the two types of quantum walk appear fundamentally different, owing to the need for extra degrees of freedom in the discrete-time case. In this article, I describe a precise correspondence between continuous- and discrete-time quantum walks on arbitrary graphs. Using this correspondence, I show that continuous-time quantum walk can be obtained as an appropriate limit of discrete-time quantum walks. The correspondence also leads to a new technique for simulating Hamiltonian dynamics, giving efficient simulations even in cases where the Hamiltonian is not sparse. The complexity of the simulation is linear in the total evolution time, an improvement over simulations based on high-order approximations of the Lie product formula. As applications, I describe a continuous-time quantum walk algorithm for element distinctness and show how to optimally simulate continuous-time query algorithms of a certain form in the conventional quantum query model. Finally, I discuss limitations of the method for simulating Hamiltonians with negative matrix elements, and present two problems that motivate attempting to circumvent these limitations.Comment: 22 pages. v2: improved presentation, new section on Hamiltonian oracles; v3: published version, with improved analysis of phase estimatio