Stationary Nonlinear Schr\"odinger Equation on Simplest Graphs: Boundary conditions and exact solutions

We treat the stationary (cubic) nonlinear Schr\"odinger equation (NSLE) on simplest graphs. Formulation of the problem and exact analytical solutions of NLSE are presented for star graphs consisting of three bonds. It is shown that the method can be extended for the case of arbitrary number of bonds of star graphs and for other simplest topologies such as tree and loop graphs. The case of repulsive and attractive nonlinearities are treated separately

A multidisciplinary approach to study precipitation kinetics and hardening in an Al-4Cu (wt. %) alloy

A multidisciplinary approach is presented to analyse the precipitation process in a model Al-Cu alloy. Although this topic has been extensively studied in the past, most of the investigations are focussed either on transmission electron microscopy or on thermal analysis of the processes. The information obtained from these techniques cannot, however, provide a coherent picture of all the complex transformations that take place during decomposition of supersaturated solid solution. Thermal analysis, high resolution dilatometry, (high resolution) transmission electron microscopy and density functional calculations are combined to study precipitation kinetics, interfacial energies, and the effect of second phase precipitates on the mechanical strength of the alloy. Data on both the coherent and semi-coherent orientations of the {\theta}"/Al interface are reported for the first time. The combination of the different characterization and modelling techniques provides a detailed picture of the precipitation phenomena that take place during aging and of the different contributions to the strength of the alloy. This strategy can be used to analyse and design more complex alloys

Efeito do peso do ovo e do seu tempo de armazenamento sobre a viabilidade dos pintos do dia

Este trabalho foi desenvolvido com o intuito de estudar o efeito do peso do ovo e do seu tempo de armazenamento sobre a viabilidade dos pintos do dia, resultantes de um bando de galinhas Shaver Redbro cruzadas com galos Starcross x Shaver carecos. Neste sentido, na cidade de Bragança (latitude 410 49'N, longitude 60 40'W e altitude 720 metros), mais precisamente na Quinta de Santa Apolónia, pertencente à Escola Superior Agrária de Bragança, foram efectuadas quatro séries de incubação utilizando no seu conjunto, 333 ovos sujeitos a um período de armazenamento que variou entre 2 e 34 dias (15,6+9,1 dias)