SHADOC: a multi‐agent model to tackle viability of irrigated systems

The viability of irrigated systems in the Senegal River Valley is being brought into question today due to their underutilization. We assume that their viability depends largely on the way their different components behave and interact. We therefore sought to examine in greater depth today's knowledge of the structure of these systems and activities performed within them. This led to the development of a multiagent system model, a kind of virtual irrigated system, with a special focus on rules in use for access to credit, water allocation and cropping season assessment as well as organization and coordination of farmers. The purpose of this paper is to show how this kind of tool is relevant to the study of irrigated systems' viability. As an example it is used to examine the influence of existing social networks on the viability of irrigated systems.     

Selective alkylation of a 6,7-dihydroxyquinazoline

A convenient 3-step multi-parallel process for the preparation of 4-(3-chloro-2-fluoroanilino)-6,7-bisalkoxyquinazolines is highlighted.     

Electronic structure of Al2O3 from electron energy loss spectroscopy

The electronic structure of Al₂O₃ has been studied by electron energy loss spectroscopy (ELS), and an energy level model of both filled and empty states has been constructed from the ELS and available optical data. For the high temperature pyrolytic α-polycrystalline Al₂O₃ films, the transitions are assumed to originate at the two principal peaks in the valence band density of states and the O(2s) core state, and to terminate on two peaks within the conduction band density of states. We also report energy loss spectra due to excitations out of the deeper Al(2p), Al(2s), Al(1s), and O(1s) core levels. The excitations originating at the Al(2p), Al(2s), and Al(1s) core levels terminate on levels in the conduction band and on an exciton lying about 1 eV below the conduction-band edge.     

Raman bandshape analysis in liquid fluorine

A bandshape study of the Raman diffusion by liquid fluorine over the temperature range 75–100°K is presented. A discussion of the molecular reorientation process is developed.     

Bestimmung von ?thoxygruppen in organischen Siliciumverbindungen

Ohne Zusammenfassung     

Comportamento asintotico degli integrali di un particolare sistema di equazioni differenziali ordinarie non lineari

Lavoro eseguito presso l'INAC nell'ambito del Gruppo di Ricerca n. 22 del C.N.R..     

Gas-chromatographische Bestimmung niedrigsiedender Verbindungen in Gegenwart eines st?renden L?sungsmittels

Ohne Zusammenfassung     

Applications of a quantum virial theorem to kronig and penney's model and to a diatomic molecule in static approximation

Kronig and Penney's model is used to test a new formulation of quantum virial theorem for periodic systems. It is shown that the corrective term to the usual formulation of the virial theorem corresponding to boundary conditions is of importance and gives correct energy values for the system. Application of the virial theorem to a diatomic molecule also shows an important boundary condition correction if the distance of the nuclei is slightly different from equilibrium position, in accordance with the above correction.