33,707 research outputs found

    High fidelity thrust model for solar photon sailing

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    Taking into consideration the importance of a detailed model in the trajectory propagation, three space missions using solar photon sailing has been studied with a different thrust model. Then, an equipment has been designed and built to measure the deformation of a real sample of solar sail on several work conditions. An analysis of the deformations and they distributions has been taken in account to extrapolate a more accurate model for thrust. A comparison between models in function of the sail parameters has been presented to compare the optimal time of travel to reach a circular-to-circular orbital change

    Uneasy social and psychological landscapes in the cinemas of Chile and New Zealand

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    Distinct modes of social and psychological angst are noted in a significant number of films from Chile and New Zealand, becoming most evident in the way family relations are portrayed, and in various modes through which the protagonists relate to their natural and social environment. This article focuses on the films In My Father’s Den (Brad McGann, New Zealand, 2004) and B-Happy (Gonzalo Justiniano, Chile, 2003). The narrative of both these films centres on lower-middle-class adolescent girls who reside in semi-rural areas, living in a state of unease due to the difficulties they confront in finding social and familial protection, which drives them to yearn and search for alternative geographical, cultural and affective landscapes. This comparative examination suggests that the crisis of identity displacement observed in New Zealand society engenders more tragic results than those gestated by the ‘concrete’ socio-economic exclusion found in Chile, indicating perhaps that sociopsychological anxieties require more complex and intricate strategies of recognition and eradication than those created by structural forms of social abuse

    Pairing of few Fermi atoms in one dimension

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    We study a few Fermi atoms interacting through attractive contact forces in a one-dimensional trap by means of numerical exact diagonalization. From the combined analysis of energies and wave functions of correlated ground and excited states we find evidence of BCS-like pairing even for very few atoms. For moderate interaction strength, we reproduce the even-odd oscillation of the separation energy observed in [G. Zuern, A. N. Wenz, S. Murmann, A. Bergschneider, T. Lompe, and S. Jochim, Phys. Rev. Lett. 111, 175302 (2013)]. For strong interatomic attraction the arrangement of dimers in the trap differs from the homogeneous case as a consequence of Pauli blockade in real space.Comment: Major revision to appear in Physical Review

    Three interacting atoms in a one-dimensional trap: A benchmark system for computational approaches

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    We provide an accurate calculation of the energy spectrum of three atoms interacting through a contact force in a one-dimensional harmonic trap, considering both spinful fermions and spinless bosons. We use fermionic energies as a benchmark for exact-diagonalization technique (also known as full configuration interaction), which is found to slowly converge in the case of strong interatomic attraction.Comment: To appear in Journal of Physics B: Atomic, Molecular and Optical Physic
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