Results 51 to 60 of about 154,413 (348)

Fully 3D‐Printed Wave‐Wound Electromagnetic Motors

Advanced Materials Technologies, EarlyView.
This work presents the first fully 3D‐printed wave‐wound electromagnetic motors, which are created using conductive nanoparticle inks, carbon‐filled nylon polymers, and surface mount components. These motors can achieve a stall torque of 7.62N·mmA−1$7.62 \nobreakspace N{\cdot }mm A^{-1}$ and efficiency of 28.2 %, which approaches the performance of ...
Joseph Schwalbe, Sebastian Mettes, Eduardo Francke, Kenneth W. Allen, Yi Chen Mazumdar   +4 more
wiley   +1 more source

Micromachined Double‐Membrane Mechanically Tunable Metamaterial for Thermal Infrared Filtering

Advanced Photonics Research, Volume 6, Issue 5, May 2025.
Herein, a mechanically tunable double‐layer plasmonic metamaterial leveraging the extraordinary optical transmission effect observed in subwavelength arrays of openings within thin metal layers is presented. The concept is experimentally validated by integrating the proposed metamaterial structure into an electrostatic parallel‐plate actuator to create
Oleg Bannik, Fedor Kovalev, Mingkai Liu, Michal Zawierta, Dilusha Silva, Lorenzo Faraone, Mariusz Martyniuk, Ilya Shadrivov   +7 more
wiley   +1 more source

Quasi-Two-Dimensional Dynamics of Plasmas and Fluids [PDF]

, 1994
In the lowest order of approximation quasi-twa-dimensional dynamics of planetary atmospheres and of plasmas in a magnetic field can be described by a common convective vortex equation, the Charney and Hasegawa-Mirna (CHM) equation. In contrast to the two-
Akira Hasegawa, Antipov S. V., Antipov S. V., Antonova R. A., Antonova R. A., Balk A. M., Balk A. M., Charney J. G., Dyanchenko A. I., Ertel H., Gordin V. A., Gordin V. A., Horton W., Jovanović D., Kadomtsev B. B., Kandrup H. E., Kolmogorov A. N., Laedke E. W., Laedke E. W., Larichev V. D., Larichev V. D., Mazzucato E., Novakovskii S. V., Nycander J., Petviashvili V. I., Petviashvili V. I., Petviashvili V. I., Petviashvili V. I., Petviashvili V. I., Piterbarg L. I., Rudakov L. I., Shapiro V. D., Stewart H. J., Surko C. M., Tasso H., Wakatani M., Waltz R. E., Wendell Horton, Williams G. P.   +38 more
core   +1 more source

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

A comparative study of winds and tidal variability in the mesosphere/lower-thermosphere region over Bulgaria and the UK [PDF]

Annales Geophysicae, 2000
Meteor radars located in Bulgaria and the UK have been used to simultaneously measure winds in the mesosphere/lower-thermosphere region near 42.5°N, 26.6°E and 54.5°N, 3.9°W, respectively, over the period January 1991 to June 1992.
D. Pancheva, D. Pancheva, P. Mukhtarov, N. J. Mitchell, A. G. Beard, H. G. Muller   +5 more
doaj   +1 more source

A multiscale asymptotic theory of extratropical wave–mean flow interaction [PDF]

, 2018
Multiscale asymptotic methods are used to derive wave-activity equations for planetary and synoptic scale eddies and their interactions with a zonal mean flow.
Boljka, L., Shepherd, T. G.
core   +1 more source

Soft Robotic Snake with Tunable Undulatory Gait for Efficient Underwater Locomotion

Advanced Robotics Research, EarlyView.
This study designs an underwater soft snake robot using 3D‐printed soft actuators, controlled by specific signals to generate sinusoidal undulation. Results show a positive correlation between speed and swing amplitude, with optimal performance at 2/3π phase offset, PLA tail, 1.2 voltage growth rate, and 6s undulation period achieving a maximum speed ...
Huichen Ma, Junjie Zhou, Raye Yeow
wiley   +1 more source

Effect of planetary waves on cooling the upper mesosphere and lower thermosphere by the CO₂ 15-µm emission [PDF]

Annales Geophysicae, 2004
The steady-state 2-D linearized model of global-scale waves, calibrated according to available observations, is used to evaluate planetary-wave perturbations of temperature from the surface up to the height of about 165km.
G. M. Shved, V. P. Ogibalov, A. I. Pogoreltsev   +2 more
doaj   +1 more source

Types of Coupling between the Stratospheric Polar Vortex and Tropospheric Polar Vortex, and Tropospheric Circulation Anomalies Associated with Each Type in Boreal Winter

Remote Sensing, 2023
Fifty years of daily ERA5 reanalysis data are employed to investigate the linkages between the strength of the stratospheric polar vortex and the tropospheric polar vortex during the boreal winter.
Lixin Han, Chunhua Shi, Dong Guo
doaj   +1 more source

Satellite observations of planetary waves in the mesosphere

Nature, 1976
THE pressure modulator radiometer (PMR) is one of the instruments carried by the Nimbus 6 observatory satellite launched on June 12, 1975 into a near polar circular orbit at an altitude of ∼ 1,000 km. The PMR sounds atmospheric temperature in the upper stratosphere and mesosphere (the 40–95 km height range) by measuring infrared emission from ...
Austen, M, Barnett, J, Curtis, P, Morgan, C, Houghton, J, Peskett, G, Rodgers, C, Williamson, E   +7 more
openaire   +2 more sources