Results 31 to 40 of about 154,857 (301)

Exact Computation of a Manifold Metric, via Lipschitz Embeddings and Shortest Paths on a Graph

, 2020
Data-sensitive metrics adapt distances locally based the density of data points with the goal of aligning distances and some notion of similarity. In this paper, we give the first exact algorithm for computing a data-sensitive metric called the nearest ...
Chu, Timothy, Miller, Gary, Sheehy, Donald   +2 more
core   +1 more source

Kinematic Analysis of a Spatial Cable-Driven Mechanism and Its Equivalent Hybrid Mechanism for Elliptical Trajectory

Machines, 2023
In this paper, a spatial cable-driven parallel mechanism in a V-shaped cable arrangement is proposed. It is further simplified as a planar hybrid cable-driven parallel mechanism to analyze its kinematics, which consists of two identical active cable ...
Li Wu, Xuan Liu, Mingjun Wang, Dengbiao Zhao, Lewei Tang   +4 more
doaj   +1 more source

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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Solution of an inverse kinematics problem using dual quaternions

International Journal of Applied Mathematics and Computer Science, 2020
The paper proposes a solution to an inverse kinematics problem based on dual quaternions algebra. The method, relying on screw theory, requires less calculation effort compared with commonly used approaches.
Chen Lei, Zielinska Teresa, Wang Jikun, Ge Weimin   +3 more
doaj   +1 more source

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

Dislocation constriction and cross-slip in Al and Ag: an ab initio study

, 2002
A novel model based on the Peierls framework of dislocations is developed. The new theory can deal with a dislocation spreading at more than one slip planes.
B. Joós, D.J.H. Cockayne, F.R.N. Nabarro, G. Lu, G. Lu, G. Lu, Gang Lu, J. Hartford, M.C. Payne, M.S. Duesbery, Nicholas Kioussis, S. Rao, T. Rasmussen, V.V. Bulatov, Vasily V. Bulatov, Y.M. Juan   +15 more
core   +1 more source

Improved screw theory using second order terms [PDF]

IEEE/RSJ International Conference on Intelligent Robots and System, 2003
The local displacement of an object is very useful for deciding grasp stability, generating trajectories, recognizing assembly tasks, and so on. To calculate this displacement, the screw theory is employed. It is equivalent to the first order Taylor expansion of the displacement.
J. Takamatsu, H. Kimura, K. Ikeuchi
openaire   +1 more source

Elementary edge and screw dislocations visualized at the lattice periodicity level in smectic phase of colloidal rods

, 2018
We report on the identification and quantitative characterization of elementary edge and screw dislocations in a colloidal smectic phase of tip-labeled rods.
Grelet, Eric, Repula, Andrii
core   +3 more sources

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
core   +1 more source

A geometrical introduction to screw theory [PDF]

European Journal of Physics, 2013
This work introduces screw theory, a venerable but yet little known theory aimed at describing rigid body dynamics. This formulation of mechanics unifies in the concept of screw the translational and rotational degrees of freedom of the body. It captures a remarkable mathematical analogy between mechanical momenta and linear velocities, and between ...
openaire   +2 more sources