Kwaliteit in complexiteit; ruimtelijke kwaliteit en de kennisontwikkeling daarover

Het rapport bestaat uit drie delen: een onderzoek vanuit filosofie, sociologie en semiotiek naar de wijze waarop kennis over ruimtelijke kwaliteit tot stand komt en kan komen, deels gericht op de organisatie Habiforum; een onderzoek naar de dynamischewijze waarop opvattingen over ruimtelijke kwaliteit sociaal worden geconstrueerd, tegelijk een test van verschillende theorieën; en een synthetiserende tekst over een perspectief op ruimtelijke kwaliteit vanuit een consequent doorgedacht discoursbegrip. Dit kan bijdragen aan de bewustwording binnen de ruimtelijke ordening, die nodig is om problemen op innovatieve wijze aan te pakken

Uitgesloten amateurs in het nieuwe landschap van de Nederlandse archeologie

Dit artikel gaat in op de bijdrage en rollen van amateurarcheologen . Beargumenteerd wordt dat een Nederlandse transformatie van het beleidssysteem dat verantwoordelijk is voor het behoud van archeologie, heeft bijgedragen aan de uitsluiting van de amateur-archeologen. Een aantal mechanismen die bijdragen aan de geslotenheid van het archeologisch beleidssysteem an aan de uitsluiting van de amateur-archeologen wordt geëxpliciteerd. Genoemde mechanismen zijn terug te vinden in vele contexten waarin burgers en overheden interagere

Security of Quantum Key Distribution with Coherent States and Homodyne Detection

We assess the security of a quantum key distribution protocol relying on the transmission of Gaussian-modulated coherent states and homodyne detection. This protocol is shown to be equivalent to a squeezed state protocol based on a CSS code construction, and is thus provably secure against any eavesdropping strategy. We also briefly show how this protocol can be generalized in order to improve the net key rate.Comment: 7 page

Sexual and marital trajectories and HIV infection among ever-married women in rural Malawi.

OBJECTIVE: To explore how sexual and marital trajectories are associated with HIV infection among ever-married women in rural Malawi. METHODS: Retrospective survey data and HIV biomarker data for 926 ever-married women interviewed in the Malawi Diffusion and Ideational Change Project were used. The associations between HIV infection and four key life course transitions considered individually (age at sexual debut, premarital sexual activity, entry into marriage and marital disruption by divorce or death) were examined. These transitions were then sequenced to construct trajectories that represent the variety of patterns in the data. The association between different trajectories and HIV prevalence was examined, controlling for potentially confounding factors such as age and region. RESULTS: Although each life course transition taken in isolation may be associated with HIV infection, their combined effect appeared to be conditional on the sequence in which they occurred. Although early sexual debut, not marrying one's first sexual partner and having a disrupted marriage each increased the likelihood of HIV infection, their risk was not additive. Women who both delayed sexual debut and did not marry their first partner are, once married, more likely to experience marital disruption and to be HIV-positive. Women who marry their first partner but who have sex at a young age, however, are also at considerable risk. CONCLUSIONS: These findings identify the potential of a life course perspective for understanding why some women become infected with HIV and others do not, as well as the differentials in HIV prevalence that originate from the sequence of sexual and marital transitions in one's life. The analysis suggests, however, the need for further data collection to permit a better examination of the mechanisms that account for variations in life course trajectories and thus in lifetime probabilities of HIV infection

Strong asymptotics for Cauchy biorthogonal polynomials with application to the Cauchy two--matrix model

We apply the nonlinear steepest descent method to a class of 3x3 Riemann-Hilbert problems introduced in connection with the Cauchy two-matrix random model. The general case of two equilibrium measures supported on an arbitrary number of intervals is considered. In this case, we solve the Riemann-Hilbert problem for the outer parametrix in terms of sections of a spinorial line bundle on a three-sheeted Riemann surface of arbitrary genus and establish strong asymptotic results for the Cauchy biorthogonal polynomials.Comment: 31 pages, 12 figures. V2; typos corrected, added reference

The Riemann–Hilbert approach to strong asymptotics for orthogonal polynomials on [−1,1]

We consider polynomials that are orthogonal on [−1,1] with respect to a modified Jacobi weight (1− ) (1+ ) ( ), with , >−1 and real analytic and strictly positive on [−1,1]. We obtain full asymptotic expansions for the monic and orthonormal polynomials outside the interval [−1,1], for the recurrence coefficients and for the leading coefficients of the orthonormal polynomials. We also deduce asymptotic behavior for the Hankel determinants and for the monic orthogonal polynomials on the interval [−1,1]. For the asymptotic analysis we use the steepest descent technique for Riemann–Hilbert problems developed by Deift and Zhou, and applied to orthogonal polynomials on the real line by Deift, Kriecherbauer, McLaughlin, Venakides, and Zhou. In the steepest descent method we will use the Szegő function associated with the weight and for the local analysis around the endpoints ±1 we use Bessel functions of appropriate order, whereas Deift et al. use Airy functions

Over woorden en dingen: Foucault en de Nederlandse ruimtelijke ordening

Uitleg over het ontstaan van de Nederlandse planningcultuur, tegen de achtergrond van begrippen als modernisme en postmodernisme (Foucault