34 research outputs found
Gordius villoti (Nematomorpha) life cycle in relation with caddis fly larvae
No full textThe relationships between Gordius villoti Rosa and Allogamus auri-collis Pictet larvae are described. The horsehair worms and host life cycles have been investigated in laboratory and field conditions and aspects of their morphology and behaviour are discussed
1.55 μm Optical short pulse generation at 10-GHz repetition rate, using a mode-Locked Hybrid Distributed Bragg Reflector (ML-HDBR) Laser Source
No full textFeasibility study of a passive pneumatic exoskeleton for upper limbs based on a mckibben artificial muscle
No full textExoskeletons are wearable structures or systems designed to enhance human movement and to improve the wearer’s strength or agility, providing auxiliary support aimed at reducing efforts on muscles and joints of the human body. The aim of this work is to discuss on the feasibility of a new passive upper limb exoskeleton, based on the use of pneumatic artificial muscles, and characterized by extreme lightness, cheapness, and ease of use. A broad overview of the state of the art on current exoskeletons is introduced. Then the concept of the new device is presented, and different transmission architectures between pneumatic muscle and limb are discussed. The study demonstrates the potential effectiveness of such a device for supporting an operator in heavy work condition
A passive upper-limb exoskeleton for industrial application based on pneumatic artificial muscles
No full textIn recent years, exoskeletons are increasingly spreading into the industrial manufacturing sector to improve productivity and to reduce the incidence of work-related musculoskeletal diseases. The aim of this paper is to present a 2 degrees of freedom (DoF) passive upper-limb exoskeleton, consisting of two McKibben pneumatic artificial muscles (PAMs), and used for assisting workers during activities that require them to keep their hands in a sustained position over the head for a long time. Simulations are performed to test two different commercial PAMs and two different designs of the transmission system used to convey the traction force exerted by the pneumatic muscles to the limb; then the results are discussed. A preliminary assembly of the exoskeleton is also presented. The study confirms that PAMs can be used to realize a passive upper-limb exoskeleton for industrial application and that appropriate working space can be obtained with an accurate design of the transmission system
Título: Il Costume antico e moderno di tutti i popoli
No full textv. 1-3: Della Grecia /Gironi, R; v. 4: Dell'impero Ottomano, Degli Slavi moderni /Magnetti, C.; v. 5: Degli Etruschi /Magnetti, C. , Dei Romani /Levati, A.; v. 6: Della Spagna e del Portogallo /Gironi, R., Dei Francesi /Ferrario, G.; v. 7 t. 1: Delle Isole britanniche /Levati, A., Su la Scandinavia /[Ferrario, G. ?]; v. 7 t. 2: Degli Ungheresi /Rossi, F., Della Russia europea, Sulla Polonia, L'Olanda /Ferrario, G.; v. 8 (3 t.): Costume degl'Italiani /[Ferrario, G. ?]; v. 9 t. 1: Degli Svizzeri /Levati, A., Degli antichi Germani /Bossi, L.; v. 9 t. 2: Della Germania /[Bossi, L. ?]; v. 10: Storia ed analisi degli antichi romanzi di cavalleria /Ferrario, G
Effects of fibre orientation on the behaviour of RC beams in vibrated and self-compacting concrete
No full textStructural design of fibre-reinforced members should take into consideration fibre orientation since the residual properties of the material can be different as a function of the cracking plane position and inclination. Designers must be aware of the possible negative influence of fibre orientation and they may take advantages from its positive effect. Some international standards (i.e., fib Model Code 2010 and German standard DafStb) define a factor that should take into account the orientation effects. In this context, the present paper presents the results of an experimental program aimed at evaluating steel fibre orientation in RC beams. Three beams (0.15 m x 0.70 m x 4.10 m) were cast at Magnetti Building (Carvico, Italy) factory following the most common casting process adopted in practice by using vibrated and self-compacting concrete
Highly reliable and high-yield 1300-nm InGaAlAs directly modulated ridge Fabry-Perot lasers, operating at 10-Gb/s, up to 110/spl deg/C, with constant current swing
No full textTransceivers for 300 m multimode links, based on a serial 10 Gb laser source and incorporating receiver based electronic dispersion compensation (EDC) are creating the first high volume application for 10 Gb FP (Fabry Perot). A highly reliable and high yield uncooled ridge FP laser is presented. The device shows excellent power characteristics in the 25-150/spl deg/C temperature range with very high T0 (95 K in the temperature range 0-85/spl deg/C and still 78 K at 150/spl deg/C). Outstanding dynamic performances are also shown: 6 dB of extinction ratio can be achieved up to 110/spl deg/C, by using a constant current swing of 50 mA
