162 research outputs found
Riedizione critica delle opere di Bruno Maderna
No full textLa collana è dedicata alle composizioni degli anni 40-50 del musicista Bruno Maderna, morto nel 1973. Nel 2005 è uscito il vol X : Introduzione e Passacaglia "Lauda Sion Salvatorem" , a cura di Mauro Mastropasqua
A complete ground and flight software ecosystem for operations of autonomous satellites
No full textThe commercial competition in space exploration is increasing, which requires more efficient and scalable space missions. Autonomous satellites are emerging as an answer to this challenge. Their development became possible thanks to the increased processing power available on board to sustain onboard intelligence. However, autonomous satellites cannot be operated through traditional processes. Instead, current mission operations must adapt to this paradigm shift to fully exploit the new capabilities. Operations of autonomous satellites will be enabled by an ecosystem of software applications, which consists of both ground and flight components, covering activity planning, health monitoring, and guidance navigation and control. Flight applications enable spacecraft autonomy, whereas ground applications support the operations of autonomous satellites and further streamline the process with additional functionalities. A crucial point relies on the interaction among all components, which must integrate to build a unique process. The amount of work and results produced in recent years by academic and research institutions, as well as industry players, show that the required technology is coming to maturity, with the emergence of the first commercial solutions for mission autonomy
Control of human and animal platelet aggregation by a new prostacyclin analog
No full textThe in vitro effects of ZK 36 374, a new chemically stable prostacyclin (PGI2) analog, on platelet aggregation were studied and compared to those of PGI2. Significantly lower concentrations of ZK 36 374, versus prostacyclin, were required to inhibit collagen and epinephrine-induced aggregation in human platelet-rich plasma. In contrast, in rat and rabbit platelet rich plasma, PGI2 was more effective than ZK 36 374 in inhibiting the aggregation elicited by ADP and collagen. It is concluded that ZK 36 374 is a potent antiaggregatory compound and may be useful in the prevention of cardiovascular disorders
Robust real-time monitoring of human task advancement for collaborative robotics applications
No full textA crucial problem in human-robot collaboration is to achieve seamless coordination among the agents. Robots have to adapt to human behaviour, which is highly uncertain. In fact, humans can perform each task in many ways and with different speeds, occasional errors and short pauses. This paper offers a robust method to monitor the advancement of the current human activity in real-time in order to predict its duration. The algorithm learns online templates of new variants of the task and uses them as references for a Dynamic Time Warping-based algorithm. The proposed strategy has been tested within a realistic assembly task. Results show its ability to give accurate predictions also in case of peculiar variants, such as those associated with errors
Platelets and arachidonic acid metabolism in human and experimental hypercholesterolemia
No full textThe reported platelet alterations support the concept that platelets may be determining factors in the occurrence of the thromboembolic complications and in the development of atheroclerosis in hypercholesterolemia. Such diseases, however, are multifactorial and platelets may directly or via their released products modulate the behavior of other cell systems, such as leucocytes, endothelial and smooth muscle cells. In particular studies on platelet-vessel wall interactions in different vascular beds, such as coronary and cerebral district, will contribute to the understanding of the basic mechanisms of platelet activation in the atherosclerotic disease
Flexible scheduling and tactile communication for human-robot collaboration
No full textHuman-robot collaboration (HRC) is expected to add flexibility and agility to production lines in manufacturing plants. In this context, versatile scheduling algorithms are needed to organize the increasingly complex workflow and to exploit the gained flexibility, ensuring the optimal use of resources and the smart management of failures. Moreover, intuitive user interfaces are needed to communicate with the human worker, informing him/her of the next operation to perform. Usually, grounded or wearable screens are used to this aim. Whenever human sight is impaired or needs to be free, other sensory channels could be used as well. In this work, we present a new dynamic scheduler that adapts to the system variability, and a novel way of communicating instructions to the human operators based on haptic guidance. The proposed strategies were applied to a complex assembly task involving three agents and compared to baseline methods with an experimental campaign involving 16 subjects. Results show the clear advantage of using dynamic scheduling over the static one and suggest that a combination of visual and tactile stimuli is a viable and effective solution for displaying instructions in complex HRC scenarios
Robotic handling of liquids with spilling avoidance: a constraint-based control approach
No full textStudies on the antithrombotic action of BOC-D-PHE-PRO-ARG-H (GYKI 14,451)
No full textGyki 14,451, a peptide antagonist of thrombin, was tested on an in vivo model of venous thrombosis in the rat. At the 4 and 6 mg/kg i.v. doses, the compound caused a reduction of over 80% in the incidence of thrombus formation, also markedly reducing thrombus weight. Oral administration of Gyki 14,451 (50 and 50+50 mg/kg) did not induce a significant reduction either of thrombosis incidence or of thrombus weight
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