Search results for "THRUST"
showing 5 items of 155 documents
Tectono-stratigraphic evolution of a basin generated by transpression: the case of the Early Pliocene Lascari Basin (northern Sicily)
2011
Integrated stratigraphy and structural analysis carried out in the Madonie Mts. (Northern Sicily) is aimed to the description of a syn-sedimentary tectonic event, recorded in a small infra-pliocene basin restricted to the Lascari Syncline core. The onset and evolution of the basin was driven by transpressive tectonics, generating a lens-shaped, deep and narrow tectonic depression, bounded by steep and high, tectonically controlled slopes, also reflected in the present-day topography of the area. During the genesis of the basin, the tectonic control interferes with a dramatic sea level oscillation during the Messinian-Early Pliocene time interval. In this paper, the syn-tectonic deposits of …
A physical model for the interaction between unsaturated soils and retaining structures
2020
Temporary and permanent retaining structures interact with soils that are usually in unsaturated conditions. In this work, a 1g-scale physical model is presented to investigate the interactions between retaining walls and unsaturated soils. The physical model is equipped with a water-filled hydraulic cylinder connected to a pressure-volume controller to measure the horizontal component of the later earth thrust and high capacity tensiometers to measure soil matric suction. A system of low-friction linear guideways has been installed at the base of the wall-model. The failure surface is observed through a 3 cm thick glass wall on one side of the container. A series of images are acquired dur…
Implicit regulation for automotive variators
2001
A well-known practice uses mechanical variators to realize the so-called continuously variable transmissions (CVTs) for automotive application. A remarkable problem for one of the most used CVTs is given by the hydraulic control of the axial thrust on the half-pulleys that is necessary for torque transmission. It involves a heavy decrease in transmission efficiency. In the present paper, the possible production of the required axial thrust by a simple spring to eliminate hydraulic losses is analysed. It is shown that the power capacity of such a regulated variator is near to the maximum possible, and the belt torque loss is always considerably lower than the sum of the belt and pump losses…
Nano-graphite cold cathodes for electric solar wind sail
2015
The nanographite (NG) films consisting of tiny graphite crystallites (nanowalls) are produced by carbon condensation from methane–hydrogen gas mixture activated by a direct current discharge. High aspect ratio and structural features of the NG crystallites provides efficient field electron emission (FE). Applicability and performance of the NG films in an electron gun (E-gun) of a solar wind thruster system with an electric sail (E-sail) is tested. The long-term tests are demonstrated suitability of E-gun assembly with the NG cathodes for the real space missions. The results of the tests are analyzed and physical mechanisms of the cathode aging and practical methods for improvement performa…
Infantilas rīšanas paradumi un citas orofaciālā kompleksa atradnes pirmsskolas vecuma bērniem Latvijā
2019
Ievads: Pētījuma mērķis bija izpētīt saikni starp infantilas rīšanas paradumiem ar citām orofaciālā kompleksa atradnēm pirmsskolas vecuma bērniem Latvijā. Paralēli tam mēs pētījām arī oklūziju. Metodes: Šajā šķērsgriezuma pētījumā piedalījās 141 pirmsskolas vecuma bērnu no 4 līdz 7 gadiem un viņu mātes. Orofaciālā kompleksa izmeklēšanu veica divi ortodonti, kurā tika novērtēta orofaciālā kompleksa miofunkcionālā situācija, oklūzija un bērnu runas defekti. Mātēm tika sniegtas anketas, lai iegūtu informāciju par bērnu veselības stāvokli un citiem identifikācijas datiem. Tika veikta aprakstoša statistika visiem pētījuma mainīgajiem lielumiem un vienvirziena analīze starp infantilo rīšanu un vi…