Results 1 to 10 of about 154,215 (248)

Simplified theory of Archimedean screws [PDF]

Journal of Hydraulic Research, 2009
The Archimedean screw pump is one of the oldest hydraulic machines. Today, it is employed in pumping as well as - operating in reverse - in an energy conversion role. Despite its age, no consistent theory links the screw's geometry with its mechanical efficiency. Based on geometrical parameters and an idealised energy conversion process for one turn of
Muller, Gerald, Senior, James
openaire   +1 more source

The melting performance of single screw extruders. II [PDF]

, 1981
In the previous paper (1) the melting performance of a number of recent screw designs was analyzed, using a rather simple theory. A new screw design was proposed.
Dekker, Gale, Lindt, Maddock, Menges, Street, Tadmor, Tadmor, Vermeulen   +8 more
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Screw dislocations in the field theory of elastoplasticity [PDF]

, 2002
A (microscopic) static elastoplastic field theory of dislocations with moment and force stresses is considered. The relationship between the moment stress and the Nye tensor is used for the dislocation Lagrangian.
Lazar, Markus
core   +6 more sources

Some aspects of the characteristics of vertical screw conveyors for granular material [PDF]

, 1974
A theory has been developed, based on a physical model, to describe the behaviour of non-cohesive granular material inside a vertical screw conveyor. By use of this theory, relationships have been derived between dimensionless numbers for capacity, power
Rademacher, F.J.C.
core   +2 more sources

Screw dislocation in zirconium: An ab initio study [PDF]

, 2012
Plasticity in zirconium is controlled by 1/3 screw dislocations gliding in the prism planes of the hexagonal close-packed structure. This prismatic and not basal glide is observed for a given set of transition metals like zirconium and is known to be ...
A. Akhtar, A. N. Stroh, C. Domain, D. Bacon, D. Caillard, D. Hull, D. Mills, Emmanuel Clouet, F. Ferrer, G. Henkelman, J. P. Hirth, K. E. J. Rapperport, P. Villars, V. V. Bulatov, V. Vitek   +14 more
core   +3 more sources

Enhanced Eshelby twist on thin wurtzite InP nanowires and measurement of local crystal rotation [PDF]

, 2011
We have performed a detailed study of the lattice distortions of InP wurtzite nanowires containing an axial screw dislocation. Eshelby predicted that this kind of system should show a crystal rotation due to the dislocation induced torque.
A. J. Craven, D. Ugarte, D. B. Williams, J. D. Eshelby, L. F. Zagonel, L. H. G. Tizei, M. A. Cotta, M. Tencé, O. Stéphan, T. Chiaramonte   +9 more
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A screw theory of static beams [PDF]

Proceedings 2001 IEEE/RSJ International Conference on Intelligent Robots and Systems. Expanding the Societal Role of Robotics in the the Next Millennium (Cat. No.01CH37180), 2002
We derive the deflection equation of a simple beam using the screw theory. The effects of tension, torsion and bending of the beam can be unified into a single equation. We begin by looking at the compliance matrix for small elements of the beam. This is loosely based on the work by von Mises (1924).
J.M. Selig, X. Ding
openaire   +1 more source

Accuracy and transferability of Gaussian approximation potential models for tungsten [PDF]

, 2014
We introduce interatomic potentials for tungsten in the bcc crystal phase and its defects within the Gaussian approximation potential framework, fitted to a database of first-principles density functional theory calculations.
Bartók, Albert P., Csányi, Gábor, Szlachta, Wojciech J.   +2 more
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Dislocation Kinks in Copper: Widths, Barriers, Effective Masses, and Quantum Tunneling [PDF]

, 2000
We calculate the widths, migration barriers, effective masses, and quantum tunneling rates of kinks and jogs in extended screw dislocations in copper, using an effective medium theory interatomic potential.
A. Hikata, A. Seeger, B. Joós, B. V. Petukhov, Christopher R. Myers, D. C. Ralph, Daniel C. Ralph, E.-J. Thompson, F. Kroupa, G. Schottky, G. Zárand, J. D. Eshelby, J. Lothe, J. P. Hirth, James P. Sethna, James P. Sethna, James P. Sethna, James P. Sethna, K. K. Mon, K. W. Jacobsen, K. W. Jacobsen, K. W. Jacobsen, L. B. Hovakimian, L. B. Hovakimian, O. P. Balkashin, P. Stoltze, R. C. Zeller, R. J. P. Keijsers, S. Coleman, S. K. Upadhyay, Siew-Ann Cheong, T. Kosugi, T. Vegge, Tejs Vegge, V. Narayanamurti, V. V. Pustovalov, V. V. Pustovalov, W. P. Su, W. P. Su, X. Liu   +39 more
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An elastoplastic theory of dislocations as a physical field theory with torsion

, 2002
We consider a static theory of dislocations with moment stress in an anisotropic or isotropic elastoplastical material as a T(3)-gauge theory. We obtain Yang-Mills type field equations which express the force and the moment equilibrium.
Abrikosov A A, Barut A O, Bilby B A, Cartan É, Edelen D G B, Edelen D G B, Eringen A C, Eshelby J D, Eshelby J D, Frankel T, Gairola B K D, Gairola B K D, Golebiewska-Lasota A A, Gronwald F, Gutkin M Yu, Hamermesh M, Hehl F W, Hehl F W, Hirth J P, Kadic A, Katanaev M O, Kondo K, Kosevich A M, Kröner E, Kröner E, Kröner E, Kröner E, Kröner E, Kröner E, Kröner E, Kröner E, Kröner E, Marsden J E, Maugin G A, Nabarro F R N, Nye J F, Peierls R E, Puntigam R A, Rogula D, Schaefer H, Seeger A, Trautman A, Trautman A, Trebin H-R, Trzesowski A   +44 more
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