Results 81 to 90 of about 29,899 (334)
Increased Endurance of Nonvolatile Photonics Enabled by Nanostructured Phase‐Change Materials
Advanced Materials, EarlyView.Tapered and segmented islands of the phase‐change material (PCM) antimony selenide (Sb2Se3) integrated on silicon microring resonators enable ultra‐low‐loss, high‐endurance, non‐volatile photonic tuning. The nanostructured PCM design suppresses interfacial scattering and thermal stress, achieving record endurance over 100 million electrical switching ...
Jayita Dutta +10 more
wiley +1 more source
Fuzzy Control of Rotor System Using an Electromagnetic Actuator
MATEC Web of Conferences, 2012 In recent years, a number of new methods dedicated to acoustic and vibration attenuation have been developed and proposed aiming at handling several types of engineering problems related to the dynamic behavior of the system.
Steffen V., Mahfoud J., Koroishi E. H.
doaj +1 more source
Superconducting linear actuator [PDF]
Special actuators are needed to control the orientation of large structures in space-based precision pointing systems. Electromagnetic actuators that presently exist are too large in size and their bandwidth is too low.
Hockney, Richard, Johnson, Bruce
core +1 more source
Multi-Parametric Extremum Seeking-based Auto-Tuning for Robust Input-Output Linearization Control
, 2014 We study in this paper the problem of iterative feedback gains tuning for a class of nonlinear systems. We consider Input-Output linearizable nonlinear systems with additive uncertainties.
Benosman, Mouhacine
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A novel spherical permanent magnet actuator with three degrees-of-freedom [PDF]
, 1998 The paper describes a new version of spherical actuator, which is capable of three degrees-of-freedom and a high specific torque. The three-dimensional magnetic field distribution is established using an analytical technique formulated in spherical co ...
Howe, D. +3 more
core +1 more source
Plasmonic Nanomachines: Creating Local Potential Gradients and Motions
Advanced Materials, EarlyView.Plasmonic nanomachines can generate optical, thermal, and chemical potential gradients to drive directional rectilinear, rotational, and twisting motions at the nanometer scale. The integration of multimodal plasmonic forces with functional materials and programmed structural distortions enables precise spatiotemporal actuation, thereby providing a ...
Yoonhee Kim +3 more
wiley +1 more source
The Simulation Design of Linear Actuator of Downhole Oil Recovery Vibration Device
Shiyou jixie, 2016 To reproduce the wells which have declined production or even have been shut down due to various impurities clogging,a new type of downhole vibration device has been designed to improve oil recovery through the vibration effects on the reservoir.The ...
Hou Yongjun +3 more
doaj
Actuators, 2015 A high-precision planar digital electromagnetic actuator with two displacement directions and four discrete positions is presented in this paper. The four discrete positions are located at each corner of a square cavity where a mobile permanent magnet ...
Laurent Petit +4 more
doaj +1 more source
Hydraulic Actuator System for Rotor Control [PDF]
, 1991 In the last ten years, several different types of actuators were developed and fabricated for active control of rotors. A special hydraulic actuator system capable of generating high forces to rotating shafts via conventional bearings is addressed.
Althaus, Josef, Ulbrich, Heinz
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Advanced Materials, EarlyView.Stacked nanoflake assembly (SNA) membranes can oscillate autonomously, offering opportunities for soft actuation and energy harvesting. This work uncovers the physical mechanism behind the sustained oscillation of SNA membranes in gradient humidity and identifies three governing dimensionless parameters, enabling rational design for optimizing SNA ...
Zijing Zhang +5 more
wiley +1 more source