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The work focuses on the study of the structural behaviour of a composite floor beam in the cargo area of a commercial aircraft subjected to static and dynamic loads (typical of hard or crash landing). Experimental tests have been performed in the laboratories of the Dept. of Industrial Engineering (UniNA) jointly with the development of numerical models suitable to correctly simulate the phenomenon through the LS-DYNA software. The definition of a robust numerical model allowed to evaluate the possibility of buckling triggering. The test article was equipped with potting supports on both ends of the tested beam, filling the pots with epoxy resin toughened with glass fiber nanoparticles. This allowed to uniformly load the beam ends in compression and to carry out the tests loading the specimen statically and dynamically, to observe the differences in the behaviour of the beam under two different types of applied load. The comparison between the numerical and the experimental results shows that the dynamic buckling was triggered by a quantitatively smaller load than in the static case. On the other hand, it is observed this phenomenon to postpone the failure of the structure, due to the significantly higher displacement with respect to the quasi-static case to reach that condition.

Within the global push towards environmental sustainability, the aviation industry is increasingly investigating electrification as a potential solution to reduce emissions and combat climate change. However, traditional battery integration faces significant drawbacks due to their limited energy and power densities, which negatively impact aircraft weight and performance. In this scenario, structural batteries are gaining interest, since they combine energy storage and load-bearing capabilities in multifunctional material structures, thus potentially eliminating barriers to the electrification of the air transport sector. While this novel technology holds immense potential, its integration raises new and unique airworthiness concerns. The present activity aims to support the development of aircraft certification requirements for structural batteries. Recognizing the dual nature of this technology, the proposed approach seeks to maintain or even enhance the current level of safety in both normal and emergency flight conditions.

Abstract This paper presents the control solutions to the spacecraft formation reconfiguration problem when impulsive or extended maneuvers are considered, and the reference orbit is circular. The proposed approach for the derivation of the control solutions is based on the inversion of the linearized equations of relative motion parameterized using the mean relative orbit elements. The use of mean relative orbit elements eases the inclusion of perturbing accelerations, such as the Earth's oblateness effects, and offers an immediate insight into the relative motion geometry. Several maneuvering schemes of practical operational relevance are considered and the performance of the derived impulsive and piecewise continuous control solutions are investigated through the numerical propagation of the nonlinear relative dynamics. Finally, the benefits of the new extended maneuvers strategies are assessed through a comparison with the corresponding impulsive one. [ABSTRACT FROM AUTHOR]

Nowadays there are several treatments to deal with disc-articular diseases as well as acute and chronic pain; they are all aimed at accelerating the resolution of symptoms, minimizing the psychological and occupational impact, preventing relapses and chronic situations.A new treatment for disc-articular conflicts is oxygen-ozone therapy, which gives good results in 90% of cases. All the patients with vertebral disease treated followed the national protocol S100T 953902 for a multicentric controlled evaluation, in perspective and at random, of oxygen-ozone therapy impact by intramuscular injection into the slipped disc. Patients' compliance with O2-O3therapy is good and complications in administering O2-O3mixture are not recorded, either at a local level (allergic reactions or implications) or at a general level (anaphylactic shock, hepatic or renal complications).Some cases were simultaneously treated with oxygen-ozone therapy and amitriptyline and a more rapid improvement was noted, either concerning pain or slipped disc reduction, as well as improved mood (considering that alteration of mood is frequent in patients with painful disease).

The Mannich bases (III) and (IV) are prepared by heating the indazolones (I), paraformaldehyde and the hydrochlorides (II) of secondary amines.

Das N‐Nitroimin (I) reagiert mit 2‐Amino‐pyridin (II) zu dem N‐Pyridylimin (III), welches zu einem Gemisch der isomeren Amine (IV) reduziert wird.