Laboratory granular landslides are smaller-scale, simplified, yet well-controlled versions of larger and often tragic natural landslides. Using systematic experiments and scaling analysis, we quantify the influence of grain size, fall height, and landslide volume on runout distance. We also determine the minimum landslide size required to observe this scaling, which we find is set by a combination of air drag, grain size, and fall height.
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http://dx.doi.org/10.1103/PhysRevE.109.064907 | DOI Listing |
Sci Rep
December 2024
Climate and Global Dynamics Laboratory, NSF National Center for Atmospheric Research, 1850 Table Mesa Drive, Boulder, CO, 80305, USA.
The warm Western Boundary Currents (WBCs) and their zonal extensions are persistent, deep, strong and narrow oceanic currents. They are known to anchor and energize the Extra-Tropical storm tracks by frontal thermal air-sea interactions. However, even in the latest generation of climate models, WBCs are characterized by large biases, and both the present storm-track activity and its recent intensification are poorly estimated.
View Article and Find Full Text PDFBiomimetics (Basel)
November 2024
Robotics Institute, Beihang University, Beijing 100191, China.
Many flights, with their precise positioning capabilities, have provided rich inspiration for designing insect-styled micro air vehicles. However, researchers have not widely studied their flight ability. In particular, research on the maneuverability of using integrated kinematics and aerodynamics is scarce.
View Article and Find Full Text PDFProc Natl Acad Sci U S A
December 2024
Deakin Marine Research and Innovation Centre, School of Life and Environmental Sciences, Deakin University, Geelong, VIC 3280, Australia.
Semiaquatic taxa, including humans, often swim at the air-water interface where they waste energy generating surface waves. For fully marine animals however, theory predicts the most cost-efficient depth-use pattern for migrating, air-breathing species that do not feed in transit is to travel at around 2 to 3 times the depth of their body diameter, to minimize the vertical distance traveled while avoiding wave drag close to the surface. This has rarely been examined, however, due to depth measurement resolution issues at the surface.
View Article and Find Full Text PDFHeliyon
January 2024
Department of Mathematics, College of Science Al-Zulfi, Majmaah University, Al-Majmaah 11952, Saudi Arabia.
- The main goal of this article is to outline the key elements of activation energy that govern the slip flow of Carreau fluid over a non-linear stretched surface with heat transfer. By using the Arrhenius relation, activation energy aspects are included. Brownian diffusion and thermophoretic effects are shown through the study of nanoparticle dispersion using the Buongiorno model.
View Article and Find Full Text PDFSci Rep
December 2024
State Key Laboratory for Strength and Vibration of Mechanical Structures, Shaanxi Engineering Laboratory for Vibration Control of Aerospace Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China.
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