Dealing with uncertainties in angles-only initial orbit determination

A method to deal with uncertainties in initial orbit determination (IOD) is presented. This is based on the use of Taylor differential algebra (DA) to nonlinearly map uncertainties from the observation space to the state space. When a minimum set of observations is available, DA is used to expand the solution of the IOD problem in Taylor series with respect to measurement errors. When more observations are available, high order inversion tools are exploited to obtain full state pseudo-observations at a common epoch. The mean and covariance of these pseudo-observations are nonlinearly computed by evaluating the expectation of high order Taylor polynomials. Finally, a linear scheme is employed to update the current knowledge of the orbit. Angles-only observations are considered and simplified Keplerian dynamics adopted to ease the explanation. Three test cases of orbit determination of artificial satellites in different orbital regimes are presented to discuss the feature and performances of the proposed methodology

Per una logica dell’improvvisazione musicale. Riflessioni sul rapporto tra originale ed esemplare nell’estetica di Pareyson.

This essay aims at clarifying the relation between the notions of formativity and improvisation, with particular attention to musical practices. Firstly, I will focus on originality and exemplarity, then I will briefly deepen three themes of particular interest faced by Pareyson’s philosophy of art: 1) the unforeseen; 2) the interpretation; 3) the cue or sketch. My purpose is to suggest some adjustments to the notion of formativity, in order to outline the essential features of a logic of musical improvisation. &nbsp

Reverse logistics applied to E-commerce: A Systematic Literature Review on Methods, Applications, and Trends for a Virtual Sustainable Market / Logística reversa aplicada ao comércio eletrônico: uma revisão sistemática da literatura sobre métodos, aplicações e tendências para um mercado virtual sustentável

The digital transformation of society, strengthened by the social isolation resulting from the COVID-19 pandemic, boosted sales and returns of products in e-commerce. In this sense, reverse logistics in e-commerce (RLec) has become essential to meet environmental legislation and consumer expectations, which evaluate exchange policies on new purchases. In this sense, this article presents a systematic review of the literature and content analysis, from 2009 to 2019, to identify methods of decision making and applications in RLec. Thus, 261 publications were selected, of which 92 met the search criteria related to reverse logistics and only 7 applied to e-commerce. In view of this, the main applications involved network design (26%), remanufacturing (21%) and outsourcing (16%), aiming at reducing costs and identifying barriers in reverse operations. Finally, artificial intelligence for decision making was identified as a competitive differential in reducing the complexity and subjectivity of LRec problems

Il concetto come spazio autoriflessivo. Temi della Critica del Giudizio nella filosofia di Adorno.

The purpose of this essay is to put in evidence the deep relation between Adorno’s philosophy and Kant’s Critique of Judgement, a connection which only few scholars have been concerned with and which Adorno himself never explicitly admitted. It will be shown that both these conceptual spheres contribute to outline a self–reflective thought, which aims at going beyond itself through a critic reconsideration of its theoric assumptions. While Kant achieves this goal mainly using the analogy, Adorno tends to radicalize the paradoxical expressions of Critique of Judgement focusing on the disproportion suggested by the idea of sublime. This move has the purpose to emphasize the linguistic–expositive aspect of philosophical speculation and to open a space of mediation between subject and object, concept and reality, where Kant considers judgement as a link between freedom and nature