Aerospace. Fluid systems. Hydraulic system tubing

2016 ◽  
Keyword(s):  
Hydraulic System ◽  
Fluid Systems

Locomotion of the Limpet, Patella Vulgata L

1970 ◽  
Vol 52 (1) ◽  
pp. 201-216
Author(s):  
H. D. JONES ◽  
E. R. TRUEMAN
Keyword(s):  
Hydraulic System ◽  
Longitudinal Muscle ◽  
The Other ◽  
Muscle Fibres ◽  
Patella Vulgata ◽  
Fluid Systems ◽  
Spherical Cavities ◽  
Forward Locomotion ◽  
Contraction And Relaxation ◽  
The Waves

1. The locomotion of Patella has been studied by histological, photographic and experimental techniques. The foot consists principally of dorso-ventral and transverse muscles and has no longitudinal muscle fibres near to its sole. The pedal haemocoel is limited to a region of small spherical cavities, extending for 0.5 mm. above the sole, two pedal sinuses and several lateral vertical channels. 2. Patella moves forward by means of retrograde alternate ditaxic pedal locomotory waves, but during rarely observed backward movement the waves are direct. During tight turns the limpet uses forward locomotion on one half of the foot and backward locomotion on the other. 3. During the passage of a retrograde locomotory wave the foot is lifted off the substrate by about 0.2 mm. and the pressure beneath the sole falls by about 6 cm. of water. 4. A model is proposed to account for locomotion utilizing the dorso-ventral muscles as the sole propulsive agents in the hydraulic system of the foot. This system consists principally of the dorso-ventral and transverse muscles, the spherical cavities of the pedal haemocoel and the fluid enclosed beneath each locomotory wave. Both fluid systems may be utilized during contraction and relaxation of different groups of dorso-ventral muscles.

PID CONTROLLER TUNING USING ANT COLONY METHOD FOR SERVO HYDRAULIC SYSTEM

2019 ◽  
Vol 42 (4) ◽  
pp. 148-152
Author(s):  
Shaymaa Mahmood Mahdi ◽  
Karam Samir Khalid ◽  
Shakir Mahmood Mahdi
Keyword(s):  
Hydraulic System ◽  
Pid Controller ◽  
Ant Colony ◽  
Controller Tuning ◽  
Pid Controller Tuning

Nuovi dati sul popolamento nella pianura di Tarquinia durante la romanizzazione. Il caso della località "Il Giglio"

2008 ◽  
Vol 1 ◽  
pp. 123-135
Author(s):  
Maria Gabriella Scapaticci
Keyword(s):  
Middle Ages ◽  
Hydraulic System ◽  
Drainage System ◽  
Natural Fertility ◽  
Second Punic War ◽  
System Part ◽  
The Military ◽  
The Hill ◽  
Military Enterprise ◽  
The Middle Ages

During works for a communal athletic-ground at Tarquinia in the district “Il Giglio”, which took place between 2000 and 2001, some slight remains of ancient structures of the Late-Republican and Early-Imperial Age were accidentally discovered. The Soprintendenza per i Beni Archeologici dell’Etruria Meridionale then undertook extensive excavations, documenting a farm and an interesting hydraulic system, part of which had already been found not far from there, at Tarquinia in the district “Gabelletta”. The part of the plain of Tarquinia that is located at the foot of the hill, where Corneto was later established in the Middle Ages, was intensively cultivated with a drainage system and very extensive canalizations, because of the natural fertility of the soil and the richness of water-supplies in this region. It is thus likely that the flax for which Tarquinia was famous in antiquity was cultivated in these fields, and that, towards the end of the second Punic War, this farmland supplied Rome with the flax to make the sails destined for the military enterprise.

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