Results 51 to 60 of about 921 (215)

Nondiffracting supertoroidal pulses and optical “Kármán vortex streets”

Nature Communications
Supertoroidal light pulses, as space-time nonseparable electromagnetic waves, exhibit unique topological properties including skyrmionic configurations, fractal-like singularities, and energy backflow in free space, which however do not survive upon ...
Yijie Shen, Nikitas Papasimakis, Nikolay I. Zheludev   +2 more
doaj   +1 more source

Numerical Study of the Passive Motion of Airfoils in Porous Media [PDF]

Journal of Applied Fluid Mechanics
This study proposes adding a porous medium layer to the leading edge of a rigid airfoil and investigates the influence of various porous medium properties on the passive propulsion performance of the airfoil in a Kármán vortex street, using numerical ...
J. Tang, Z. Zhou, Y. Zhang, B. Moghtaderi, Y. Wang   +4 more
doaj   +1 more source

The three dimensional flow features of interaction between two vortex streets [PDF]

, 1998
Interaction between two vortex streets with difference in shedding frequency, generated from instability of 2-D wake-type hows is investigated numerically.
凌国灿, Xiong ZM, Ling, GC (reprint author), Chinese Acad Sci, Inst Mech, Beijing 100080, Peoples R China.   +2 more
core  

‘Enthusiasts’ and ‘Fanatics’: The Decembrists as a Case Study in French Influence on Russian Culture, Emotions and Thought

History, EarlyView.
Abstract Participants in Russia's 1825 Decembrist uprising against the Tsarist regime were, quite literally, a case study in French cultural influence upon Russia. This is particularly true as it relates to Russia's emotional cultures. Although this has not, traditionally, been the primary focus of historical analysis of this event (in Soviet or ...
ADAM COKER
wiley   +1 more source

Extensive study of flow characters for two vertical rectangular polygons in a two-dimensional cross flow

Frontiers in Mechanical Engineering
Fluid dynamics problems have a significant impact on the growth of science and technologies all over the world. This study investigates viscous fluid’s behavior when interacting with two rectangular polygons positioned vertically and aligned in a ...
Farheen Gul, Ghazala Nazeer, Madiha Sana, Sehrish Hassan Shigri, Shams Ul Islam   +4 more
doaj   +1 more source

On the Development of Turbulent Wakes from Vortex Streets [PDF]

, 1952
Wave development behind circular cylinders at Reynolds numbers from 40 to 10,000 was investigated in a low speed wind tunnel. Standard hot-wire techniques were used to study the velocity fluctuations.
Roshko, Anatol
core   +1 more source

Working‐Class Muscles? Co‐Operative Gyms in Interwar Britain

History, EarlyView.
Abstract The Health & Strength League's network of co‐operative gymnasiums constituted one of interwar Britain's most significant yet overlooked physical culture institutions, affiliating over 800 gyms across Britain and Ireland by 1939. Drawing on Health & Strength magazine's editorial content and reader contributions, this article argues that these ...
CONOR HEFFERNAN
wiley   +1 more source

Decentralized propaganda in the era of digital media: The massive presence of the Chinese state on Douyin

American Journal of Political Science, EarlyView.
Abstract The rise of social media in the digital era poses unprecedented challenges to authoritarian regimes that aim to influence public attitudes and behaviors. To address these challenges, we argue that authoritarian regimes have adopted a decentralized approach to produce and disseminate propaganda on social media.
Yingdan Lu, Jennifer Pan, Xu Xu, Yiqing Xu   +3 more
wiley   +1 more source

Viscoelastic vortex street

Physical Review Fluids
This paper is associated with a poster winner of a 2024 American Physical Society's Division of Fluid Dynamics (DFD) Gallery of Fluid Motion Award for work presented at the DFD Gallery of Fluid Motion. The original poster is available online at the Gallery of Fluid Motion,
Umang N. Patel, Jonathan P. Rothstein, Yahya Modarres-Sadeghi   +2 more
openaire   +1 more source

Piezoresistive Chopped Carbon Fiber Rubber Silicone Sensors for Shedding Frequency Detection in Alternating Vortex Streets [PDF]

, 2019
In nature, fish use sensory input to feel and adapt to flow conditions. Creating solutions that mimic these capabilities need flexible and sensitive sensor solutions. In this paper we use readily available carbon fibers as a conductive filler in a rubber
Vestad, Håvard Nitter, Martin Steinert, Steinert, Ralf Martin, Havard Vestad   +3 more
core   +1 more source