385 research outputs found
Una fornace per campane carolingia nella cattedrale di Luni (La Spezia) nel quadro di recenti ritrovamenti lunigianesi
No full textEditorial for the special issue on 2d nanomaterials processing and integration in miniaturized devices
No full textInitially considered little more than a scientific curiosity, the family of 2D nanomaterials has become increasingly popular over the last decade [...]
Characterization of polycrystalline 3CB-SiC thin films for MEMS and pressure sensors application
No full textRolling Dielectric Elastomer Actuator with Bulged Cylindrical Shape
No full textThis note presents preliminary investigations on the design and development of a rolling dielectric elastomer actuator (rDEA) with a bulged cylindrical shape. The actuator is based on an inflated silicone-based hollow cylinder consisting of a series of dielectric elastomer actuator sectors. The electrical activation of the sectors changes the shape of the rDEA; the induced geometrical change causes a variation of the position of the rDEA's centre of gravity and a consequent initiation of rolling of the rDEA. This paper presents a simplified parametric analytical model which is used to simulate the quasi-static behaviour of the rDEA. A testing procedure is used to assess the potential rolling performance of the rDEA prototypes
Electroactive Elastomeric Actuators for the Implementation of a Deformable Spherical Rover
No full textThis paper presents investigations toward the development of an inflated deformable rolling rover. The proposed novel locomotion system could find potential future use, for example, in scouting and exploration missions. The manufacturing procedure used to fabricate a preliminary prototype is presented in this paper. The prototype consists of a rigid frame and four dielectric elastomer actuator (DEA) sectors, which give the prototype a spherical shape. Analytical models are proposed to predict the electromechanical behavior of the DEA sectors and to estimate their effect on the prototype's dynamics. These models are validated through an experimental procedur
Rufloxacin once daily versus ofloxacin twice daily for treatment of complicated cystitis and upper urinary tract infections. Italian Multicentre UTI Rufloxacin Group
No full textThe efficacy and safety of rufloxacin once daily was compared with that of ofloxacin b.i.d. for therapy of complicated cystitis and upper urinary tract infections. Eighty-three patients were randomly assigned to receive rufloxacin as a loading dose of 400 mg on the first day, followed by 200 mg s.i.d., and 80 received ofloxacin 300 mg b.i.d. Both agents were administered orally for a median duration of eight days. Bacterial elimination rates after treatment were 90% for rufloxacin and 81% for ofloxacin. Half of the treatment failures occurred in patients with infections caused by uropathogens that became either less sensitive or resistant to the quinolones being studied. At a two-week follow-up, recurrences had not occurred in any of the rufloxacin patients and had occurred in 17% of the ofloxacin patients. Minor adverse reactions were reported by 12 and 13 patients, respectively. Rufloxacin once daily is as effective as ofloxacin b.i.d. for the treatment of complicated cystitis and upper urinary tract infections
DYNAMIC COORDINATION OF A MULTI-DOF MANIPULATOR-PLATFORM SYSTEM
No full textIn this paper the performance of a novel reaction control method recently introduced by some of the
authors is analyzed in the case of multi-degrees-of-freedom manipulator-platform systems. The proposed
method locally minimizes the base reactions transferred by redundant manipulators to the base spacecraft
by using simple least-squares real-time routines. The interesting performances that can be achieved with a
high level of redundancy are analyzed in this paper in case of minimizing the base reaction torques,
forces, or weighted combinations of them. The Zero Reaction Workspace in which a null reaction torque
is possible has been computed for different space manipulators with increasing degrees of freedom,
showing that it can be significantly increased by increasing the available degree of redundancy. This
study has been carried out for free-floating and fixed-based manipulators, which are used as a reference,
and both considering the robot physical joint limits or not. In addition, a study on the peak joint angles,
velocities, and accelerations required to perform an end-effector trajectory inside the Zero Reaction
Workspace by robot with increasing degrees of freedom has been carried out, using the classical
pseudoinverse solution as a reference. Then, the Zero Reaction Workspaces in case of minimizing the
base reaction torques, forces, or weighted combinations of them are compared for different robot degrees
of freedom, with particular attention to their shape and area, both in the case of free-floating base and
fixed-based robots. Finally, the study of the Zero Reaction Workspace for increasing number of desired
null reaction components has been carried out for a 5-degrees-of-freedom manipulator
Cost efficient master fabrication process on copper substrates
No full textIn this work a rapid and low cost process for master fabrication was carried out. Thick epoxy SU-8 photoresist was employed as sacrificial patternable layer for the definition of metal deposition area. An SU-8 photolithographic recipe was employed on low cost copper substrates, without the use of a seed layer. In particular an improvement of SU-8 adhesion, for structures with 7:1 aspect ratio, was obtained. This process was characterized by Field Emission Scanning Electron Microscope analysis on metallic substrates and it was compared with other UV-LIthographie Galvanoformung Abformung processes. An electrolytic Cu deposition was used to fabricate the master and, since the metal was deposited directly onto the copper substrate, the simplified LIGA-like process did not require silicon substrate removal or mechanical polishing. Hence, the fabrication steps and process time were considerably decreased. Finally, different molds with microfluidic patterns for hot embossing replication were obtained in 24 h with a significant costs reduction. © 2011 Elsevier B.V. All rights reserved
Correction to: advanced olfactory neuroblastoma in a teenager: a clinical case and short review of literature (Child's Nervous System, (2020), 36, 3, (485-489), 10.1007/s00381-020-04514-9)
No full textThe original version of this article unfortunately contained an error. The author apologizes for having communicated an interchanged author’s first and family names. Given in this article are the correct author names
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