Results 51 to 60 of about 949 (216)

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

Persistence of the planetary wave type oscillations in foF2 over Europe [PDF]

Annales Geophysicae, 2003
Planetary waves are oscillations of very predominantly tropospheric origin with typical periods of about 2–30 days. Their dominant zonal wave numbers are 1, 2 and 3, i.e. the waves are of large-scale (global) character.
J. Laštovička, P. Križan, P. Šauli, D. Novotná   +3 more
doaj   +1 more source

Mid-Latitude Mesospheric Zonal Wave 1 and Wave 2 in Recent Boreal Winters

Remote Sensing, 2021
Planetary waves in the mesosphere are studied using observational data and models to establish their origin, as there are indications of their generation independently of waves in the stratosphere.
Yu Shi, Oleksandr Evtushevsky, Valerii Shulga, Gennadi Milinevsky, Andrew Klekociuk, Yulia Andrienko, Wei Han   +6 more
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

Hard‐Magnetic Soft Millirobots in Underactuated Systems

Advanced Robotics Research, EarlyView.
This review provides a comprehensive overview of hard‐magnetic soft millirobots in underactuated systems. It examines key advances in structural design, physics‐informed modeling, and control strategies, while highlighting the interplay among these domains.
Qiong Wang, Zixuan Zhang, Bingyan Li, Junkai Wang, Hongcheng Gu   +4 more
wiley   +1 more source

Ultra-Low Frequency Waves of Foreshock Origin Upstream and Inside of the Magnetospheres of Earth, Mercury, and Saturn Related to Solar Wind–Magnetosphere Coupling

Universe
This review examines ultra-low frequency (ULF) waves across different planetary environments, focusing on Earth, Mercury, and Saturn. Data from spacecraft missions (CHAMP, Swarm, and Oersted for Earth; MESSENGER for Mercury; and Cassini for Saturn ...
Zsofia Bebesi, Navin Kumar Dwivedi, Arpad Kis, Antal Juhász, Balazs Heilig   +4 more
doaj   +1 more source

A Review on Sensor Technologies, Control Approaches, and Emerging Challenges in Soft Robotics

Advanced Robotics Research, EarlyView.
This review provides an introspective of sensors and controllers in soft robotics. Initially describing the current sensing methods, then moving on to the control methods utilized, and finally ending with challenges and future directions in soft robotics focusing on the material innovations, sensor fusion, and embedded intelligence for sensors and ...
Ean Lovett, Maxwell Hammond, Niloufar Seyfi, Amirreza Fahim Golestaneh, Venanzio Cichella, Caterina Lamuta   +5 more
wiley   +1 more source

GRAVITATIONAL WAVES EMITTED BY EXTRASOLAR PLANETARY SYSTEMS

International Journal of Modern Physics D, 2000
In this paper we consider the Extrasolar Planetary Systems recently discovered in our Galaxy as potential sources of gravitational waves. We estimate the frequency and characteristic amplitude of the radiation they emit due to the orbital motion, using the quadrupole formalism.
FERRARI, Valeria, M. D'ANDREA, E. BERTI
openaire   +3 more sources

Nonlocomotory Robotic Strategies for Dynamic Rotation Control in Terrestrial Robots: A Review

Advanced Robotics Research, EarlyView.
Terrestrial robots increasingly require rapid body rotation to maintain stability and agility in complex environments. This review shows nonlocomotory rotational control strategies that operate without ground contact, including reaction wheels, tails, bars, limbs, and thrusters.
Y. Liang, J. An, X. Zheng, D. Wang, S. Wang, X. Wang, P. Zhu, J. Pei, S. Li, J. Paripurana, Y. Han, Z. Tang, X. Gan, Q. He, X. Ma   +14 more
wiley   +1 more source

Trapped planetary (Rossby) waves observed in the Indian Ocean by satellite borne altimeters [PDF]

Ocean Science, 2017
Using 20 years of accurately calibrated, high-resolution observations of sea surface height anomalies (SSHAs) by satellite borne altimeters, we show that in the Indian Ocean south of the Australian coast the low-frequency variations of SSHAs are ...
Y. De-Leon, N. Paldor
doaj   +1 more source