177 research outputs found
Gandhi and Peace in the Museums of the World
No full textThe article is about Gandhi’s musealization as a pacifist leader in the world. Particular emphasis has always been placed on the figure of Gandhi as a symbol of peace, a concept that encompasses many aspects of his vision. Gandhi’s pacifism is not only a rejection of war, passive nonviolence, but it is an active force, which, in order to be realized through satya (Truth) and ahiṃsā (nonviolence), acts on two levels, spiritual and political. This includes a transformative dialogue between individuals and nations, the renunciation by the great powers of imperialist designs, nuclear disarmament, the ideal of the sarvodaya (universal uplift), and practicing voluntary poverty. To understand whether these aspects are evaluated, the author analyzes significant museums for peace in India and outside India, taking into account the particular historical and cultural contexts to which they belong. These institutions give audiences access to witnessing aspects of the universality of the Gandhian message, reflecting a communion between East and West. While recognizing that in museum’s choices we sometimes witness the exploitation and trivialization of the Mahatma, for the purpose of commercialization, they have the capacity to restore, if not the entirety and complexity of the historical figure and his message, at least a part of it and an invitation to deepen and explore its meaning
◦ Unità dell’essere e superamento delle divisioni religiose nella visione di Akbar
No full textL’articolo analizza la visione religiosa e politica di Akbar (1542-1605), terzo imperatore della dinastia Mughal, noto per le sue politiche di inclusività e il suo tentativo di superare le divisioni religiose in un contesto culturale e confessionale straordinariamente variegato. Radicato nella tradizione sufi e ispirato dal principio di ṣulḥ-i kull ("pace con tutti"), Akbar sviluppò una concezione dell’unità dell’essere che informò le sue riforme amministrative e la sua visione di un impero fondato sulla coesistenza armoniosa tra comunità diverse. L’articolo indaga come Akbar abbia cercato di integrare prospettive religiose differenti in un quadro unitario, evidenziando le implicazioni di questa visione per la costruzione di una specifica identità imperiale
Investigation of sloshing phenomena near the critical filling depth through the Hilbert-Huang Transformation
No full textPropagation of gravity waves through an SPH scheme with numerical diffusive terms
No full textBasing on the work by Antuono et al. (2010) [1], an SPH model with numerical diffusive terms (here denoted delta-SPH) is combined with an enhanced treatment of solid boundaries to simulate 20 gravity waves generated by a wave maker and propagating into a basin. Both regular and transient wave systems are considered. In the former, a large number of simulations is performed for different wave steepness and height-to-depth ratio and the results are compared with a BEM Mixed-Eulerian-Lagrangian solver (here denoted BEM-MEL solver). In the latter, the delta-SPH model has been compared with both the experimental measurements available in the literature and with the BEM-MEL solver, at least until the breaking event occurs. The results show a satisfactory agreement between the delta-SPH model, the BEM-MEL solver and the experiments. Finally, the influence of the weakly-compressibility assumption on the SPH results is inspected and a convergence analysis is provided in order to identify the minimal spatial resolution needed to get an accurate representation of gravity waves. (C) 2010 Elsevier B.V. All rights reserved
ARMONIA: Feasibility Study on Aerobots in Martian Atmosphere to Enhance Science Return
No full textIn the framework of a prolonged Mars exploration, a mission to Mars supported by aerial vehicles has been investigated. The study exploits aerial platforms to collect high resolution ground and atmosphere data flying on extended Mars regions for prolonged period. The polar and tropical regions are to be visited: The former to collect data on the sublimation of polar caps during spring and detect source of methane, the latter to deepen the knowledge about the genesis of local dust storms, the formation of dust devils, enhance knowledge on Hellas Planitia and Valles Marineris. The Armonia Mission architecture includes 1 orbiter, 2 ground sensors stations delivered in the tropical regions, and 3 balloons, to fly over the pole and monitor the icy caps seasonal dynamics, and over the tropics investigating storms formations and winds evolution. The paper briefly introduces the whole mission and subsystem sizing, and focuses its attention on the balloons technology: The Mars Climate Database has been exploited to model the seasonal evolution of the atmospheric temperature, density, wind velocities, fundamental properties to tune the balloons design. Super- pressure balloons have been selected as better suited for the Mars application; the performed design, her presented, highlights the strong interdependences among material selection, environment, path planning and GNC, operations, for those aerial vehicles. The balloons (28m and 35m in diameter respectively for polar and tropical areas) are filled with helium and can fly a gondola of 42kg, connected to the balloon thanks to a 500m tether. The design compliance with respect to the mission and performance requirements is discussed too together with the technology readiness to run the mission
Chorin's approaches revisited: Vortex Particle Method vs Finite Volume Method
No full textIn the present paper, a Vortex Particle Method is combined with a Boundary Element Method for the study of viscous incompressible planar flow around solid bodies. The method is based on Chorins operator splitting approach for the Navier–Stokes equations written in vorticity–velocity formulation, and consists of an advection step followed by a diffusion step. The evaluation of the advection velocity exploits the Helmholtz–Hodge Decomposition, while the no-slip condition is enforced by an indirect boundary integral equation. The above decomposition and splitting are discussed in comparison to the analogous decomposition for the pressure-velocity formulation of the governing equations. The Vortex Particle Method is implemented with a completely meshless algorithm, as neither advection nor diffusion requires topological connection of the point lattice. The results of the meshless approach are compared with those obtained by a mesh-based Finite Volume Method, where the pseudo-compressible iteration is exploited to enforce the solenoidal constraint on the velocity field. Several benchmark tests were performed for verification and validation purposes. In particular, we analyzed the two-dimensional flow past a circle, past an ellipse with incidence and past a triangle for different Reynolds numbers
HYDRODYNAMIC MODELLING OF SEMI-DISPLACEMENT MULTI-HULL VESSELS
No full textBoth experimental and numerical tools are used to investigate the steady flow field around a trimaran vessel. The experimental measurements are used to state the reliability of two numerical algorithms: a fully nonlinear 2D+t potential flow solver and a linear 3D-RPM numerical model. Then, the two solvers have been used to study the physical features highlighted by the experiments, more in particular to identify the interference and linear and nonlinear hydrodynamic interaction among the hulls and behind the transom stern
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