Results 11 to 20 of about 123 (120)
Developments and Challenges of Miniature Piezoelectric Robots: A Review. [PDF]
Adv Sci (Weinh), 2023 Miniature piezoelectric robots (MPRs) have exhibited many highlight features and captured considerable attentions and favor of numerous scholars. A comprehensive review of recent development in MPRs is provided, including the operating environment, the structure of piezoelectric actuating element, working principle, attempts of new fabricated methods ...
Li J +5 more
europepmc +2 more sources
The Canadian Journal of Chemical Engineering, Volume 101, Issue 10, Page 6003-6016, October 2023., 2023 Drawbacks in phase change models in simulating flashing of steam with a subsaturation downstream boundary condition. Abstract The development of phase change models applicable to a wide range of temperatures, pressures, and mass flow rates is primarily limited by the metastable or partially stable behaviour of the fluid. Due to this, the fluid does not
Stanley John, Carlos F. Lange
wiley +1 more source
Deep‐time invention and hydrodynamic convergences through amniote flipper evolution
The Anatomical Record, Volume 306, Issue 6, Page 1323-1355, June 2023., 2023 Abstract The diapsid plesiosaurs were pelagic and inhabited the oceans from the Triassic to the Cretaceous. A key evolutionary character of plesiosaurs is the four wing‐like flippers. While it is mostly accepted that plesiosaurs were underwater fliers like marine turtles, penguins, and maybe whales, other swimming styles have been suggested in the past.
Anna Krahl, Ingmar Werneburg
wiley +1 more source
Beltrami fields and knotted vortex structures in incompressible fluid flows
Bulletin of the London Mathematical Society, Volume 55, Issue 3, Page 1059-1103, June 2023., 2023 Abstract This paper gives a survey on recent results about the existence of knotted vortex structures in incompressible fluids. This includes the proof of Lord Kelvin's conjecture on the existence of knotted vortex tubes in steady Euler flows and a new probabilistic approach to address Arnold's speculation that typical Beltrami fields should exhibit ...
Alberto Enciso, Daniel Peralta‐Salas
wiley +1 more source
Ship waves in rivers: Environmental criteria and analysis methods for measurements
River Research and Applications, Volume 39, Issue 4, Page 629-647, May 2023., 2023 Abstract A literature review shows that the most important physical quantities determining environmental impact of ship waves in a waterway are the fluid velocities, maximum and minimum water levels, and size of drawdown events. Fluid velocity can vary strongly in the vertical so that the usual measurements at a single point are not enough unless made ...
John D. Fenton +3 more
wiley +1 more source
Lake dynamics in an Early Jurassic desert: Evidence from the Clarens Formation in southern Africa
Sedimentology, Volume 70, Issue 3, Page 865-894, April 2023., 2023 ABSTRACT Interdune deposits are sensitive to climatic fluctuations and ancient interdune lacustrine systems can reveal the drivers of erg dynamics through time and space. This southern African study details the dynamics of interdune deposition in a vast ancient desert system that was active over Pangaea in the Middle Mesozoic and formed part of one of ...
Howard V. Head, Emese M. Bordy
wiley +1 more source
Journal of Morphology, Volume 284, Issue 2, February 2023., 2023 Cetaceans both depart from and are defined by their mammalian biology. This paradox is best exemplified during embryonic development. Here, we discuss stages of prenatal development in the beluga whale (Delphinapterus leucas), the bowhead whale (Balaena mysticetus), and the pan‐tropical spotted dolphin (Stenella attenuata), calling attention to ...
Lia Gavazzi +8 more
wiley +1 more source
Applied Sciences, 2018 The goal of this study involves developing an efficient and accurate parallel computation method for two-phase flow problems including complex moving foreign bodies.
Minho Ha +5 more
doaj +1 more source
Pressure Characteristics and Cavitation on an Oscillating Hydrofoil
Journal of the Society of Naval Architects of Japan, 1972 Unsteady cavitation that results from the non-uniformity of the flow field renders evil influences on marine propellers. It has been a general experiment for the investigation on such problems to observe unsteady cavitation in a flow field analogous to a wake pattern.
Hideaki Miyata +2 more
openaire +2 more sources
Hydrodynamic and energy extraction properties of oscillating hydrofoil with double Fowler flaps
Frontiers in Marine ScienceIn order to improve the energy extraction capability of oscillating hydrofoils, a dual Fowler flap structure is adopted as a device to increase lift.
Guang Sun +4 more
doaj +1 more source