Results 121 to 130 of about 1,173,580 (298)

Liquid Crystal Elastomer Actuator Matrix for Large Area Applications

Advanced Materials Technologies, EarlyView.
A scalable approach is used to manufacture a digitally‐controllable, 2D 5 × 5 actuator matrix. The elements of the matrix are produced by direct ink writing of a liquid crystal elastomer ‘artificial muscle’ on large‐area flexible thin‐film heaters. In optimizing the low‐power actuators, multiple heater designs and substrate materials are investigated ...
Giulia Spallanzani, Bart Peeters, Danqing Liu, Peter Zalar, Hylke B. Akkerman, Jeroen A. H. P. Sol   +5 more
wiley   +1 more source

On the origin of time-dependent behaviour in a barotropically unstable shear layer [PDF]

, 2003
An experimental study on the instability of a detached Stewartson layer, using an annular, rotating tank with flat, rigid upper and lower boundaries, showed an instability to steady vortices at a critical Reynolds number, arranged in a global mode ...
Früh, W.-G., Fruh, W.G., Fruh, Wolf-Gerrit; id_orcid, Nielsen, A. H., Nielsen, A.H., A. H. Nielsen, Nielsen, A H, W.-G. Früh   +7 more
core   +1 more source

Unlocking Terahertz Steganography: Authentication of Hidden Images in Flexible Media

Advanced Materials Technologies, EarlyView.
Hidden information in multilayered devices, such as steganographic portraits, is detected and authenticated using reflection‐mode terahertz time‐domain imaging. Image reconstruction relies on a dedicated figure‐of‐merit obtained by integrating the signal intensity over the time‐window associated with the reflection from the metallic mirror backing the ...
Tiziana Ritacco, Francesca Vittorioso, Dimitrios C. Zografopoulos, Romeo Beccherelli, Walter Fuscaldo   +4 more
wiley   +1 more source

A Constraint‐Based Analytical Framework for Design‐Space Analysis and Material Screening of Tubular Multilayer Dielectric Elastomer Pumps for Extracorporeal Circulatory Applications

Advanced Materials Technologies, EarlyView.
A constraint‐based analytical framework maps the coupled effects of material properties, structural parameters, and operating conditions in tubular dielectric elastomer pumps for extracorporeal circulatory applications. The approach defines performance boundaries through mechanical, electrical, and hydraulic constraints and identifies feasible design ...
Yan Zhang, Amine Benouhiba, Yoan Civet, Yves Perriard   +3 more
wiley   +1 more source

Shear Wave Elastography Acquisition Parameters May Bias Shear Wave Velocity Measurements

Australasian Journal of Ultrasound in Medicine
ABSTRACTPurposeTo determine the effects of acquisition parameters on measured shear wave velocity (SWV) in reference phantoms.MethodsSWV were measured on three phantoms of certified SWV 0.794 m/s (Phantom 1), 1.711 m/s (Phantom 2) and 2.500 m/s (Phantom 3). Parameters examined were depth, location, region of interest (ROI) size, transducer type, pitch,
Nicholas E. Lim, Steven Abbott, Marilyn Zelesco, Christopher J. Welman   +3 more
openaire   +3 more sources

Turning Light Into Matter: Programmable Microstructures Via Dose Control in Two‐Photon Polymerization

Advanced Optical Materials, EarlyView.
This work augments two‐photon polymerization with point‐wise dose control, enabling structures with heterogeneous material properties such as refractive index. An open source toolbox and superior calibration methodology for the refractive index pave the way for bio‐mimicking or numerically optimized structure designs, and enhance the synergy between 3D
Michał Ziemczonok, Koen Vanmol
wiley   +1 more source

Shear acoustic waves in plates

Archives of Acoustics, 2014
In the paper the theoretical analysis and results of experimental investigations of SH waves propagation in plates are presented. The dimensions of different plates and methods of SH wave excitation were applied in order to attain mode separation and ...
P. KIEŁCZYŃSKI, W. PAJEWSKI, M. SZALEWSKI   +2 more
doaj  

Turbulence closure: turbulence, waves and the wave-turbulence transition – Part 1: Vanishing mean shear [PDF]

Ocean Science, 2009
This paper extends a turbulence closure-like model for stably stratified flows into a new dynamic domain in which turbulence is generated by internal gravity waves rather than mean shear.
H. Z. Baumert, H. Peters
doaj  

Elimination of Necking and Aspect Ratio Dependence in Uniaxial Actuators by Continuous Fiber Reinforcement

Advanced Robotics Research, EarlyView.
A novel carbon fiber reinforcement for dielectric elastomer actuators enhances actuation force while decoupling electromechanical performance from the actuator's aspect ratio. Unlike conventional fiber reinforcements, it enables a uniform planar stretch state along the entire actuator.
Markus Koenigsdorff, Stefania Konstantinidi, Anett Endesfelder, Petr Osipov, Johannes Mersch, E.‐F. Markus Vorrath, Martina Zimmermann, Yves Perriard, Gerald Gerlach   +8 more
wiley   +1 more source

Transcranial focused ultrasound generates skull-conducted shear waves: Computational model and implications for neuromodulation. [PDF]

Appl Phys Lett, 2020
Salahshoor H, Shapiro MG, Ortiz M.
europepmc   +1 more source