Non conventional screening of the Coulomb interaction in low dimensional and finite size system

We study the screening of the Coulomb interaction in non polar systems by polarizable atoms. We show that in low dimensions and small finite size systems this screening deviates strongly from that conventionally assumed. In fact in one dimension the short range interaction is strongly screened and the long range interaction is anti-screened thereby strongly reducing the gradient of the Coulomb interaction and therefore the correlation effects. We argue that this effect explains the success of mean field single particle theories for large molecules.Comment: 4 pages, 5 figure

Players Indifferent to Cooperate and Characterizations of the Shapley Value

In this paper we provide new axiomatizations of the Shapley value for TU-games using axioms that are based on relational aspects in the interactions among players. Some of these relational aspects, in particular the economic or social interest of each player in cooperating with each other, can be found embedded in the characteristic function. We define a particular relation among the players that it is based on mutual indifference. The first newaxiom expresses that the payoffs of two playerswho are not indifferent to each other are affected in the same way if they become enemies and do not cooperate with each other anymore. The second new axiom expresses that the payoff of a player is not affected if players to whom it is indifferent leave the game. We show that the Shapley value is characterized by these two axioms together with the well-known efficiency axiom. Further, we show that another axiomatization of the Shapley value is obtained if we replace the second axiom and efficiency by the axiom which applies the efficiency condition to every class of indifferent players. Finally, we extend the previous results to the case of weighted Shapley values. © Springer-Verlag Berlin Heidelberg 2012

Requirements under EU Law on the allocation of scarce European subsidies

The Legitimacy and Effectiveness of Law & Governance in a World of Multilevel Jurisdiction

Electronic Correlations in Oligo-acene and -thiophene Organic Molecular Crystals

From first principles calculations we determine the Coulomb interaction between two holes on oligo-acene and -thiophene molecules in a crystal, as a function of the oligomer length. The relaxation of the molecular geometry in the presence of holes is found to be small. In contrast, the electronic polarization of the molecules that surround the charged oligomer, reduces the bare Coulomb repulsion between the holes by approximately a factor of two. In all cases the effective hole-hole repulsion is much larger than the calculated valence bandwidth, which implies that at high doping levels the properties of these organic semiconductors are determined by electron-electron correlations.Comment: 5 pages, 3 figure

Baardvleermuizen in Ginneken en omgeving : ecologisch en toxicologisch onderzoek naar de kraamverblijfplaats van baardvleermuizen op de Hervormde Kerk te Ginneken

Doel van dit onderzoek was: 1. Meer inzicht in het leefgebied van de populatie baardvleermuizen in Ginneken en het Ulvenhoutse Bos, in het bijzonder in de locaties van de kraamverblijfplaatsen en andere zomerverblijfplaatsen zodat de bescherming van deze verblijfplaatsen en een verdere uitbreiding van de populatie beter gewaarborgd kan worden. 2. Het inzicht krijgen in de aanwezigheid van PCP-concentraties op de zolder van de kerk van Ginneken, de locatie waar en de manier waarop de baardvleermuizen hiermee in contact komen en de mogelijkheden om dit contact te verminderen

Visual localization of the horizontal as a function of body tilt up to plus or minus 90 deg from gravitational vertical

Visual localization of horizontal as function of body tilt utilizing several positions with respect to gravit