Results 21 to 30 of about 114,880 (265)

Ion acoustic waves near a comet nucleus: Rosetta observations at comet 67P/Churyumov–Gerasimenko [PDF]

Annales Geophysicae, 2021
Ion acoustic waves were observed between 15 and 30 km from the centre of comet 67P/Churyumov–Gerasimenko by the Rosetta spacecraft during its close flyby on 28 March 2015. There are two electron populations: one cold at kBTe≈0.2 eV and one warm at kBTe≈2 
H. Gunell, C. Goetz, E. Odelstad, A. Beth, M. Hamrin, P. Henri, P. Henri, F. L. Johansson, H. Nilsson, G. Stenberg Wieser   +9 more
doaj   +1 more source

Blade dynamics in combined waves and current

Journal of Fluids and Structures, 2019
Abstract Submerged aquatic vegetation (SAV), such as seagrass, is flexible and reconfigures (bends) in response to waves and current. The blade motion and reconfiguration modify the hydrodynamic drag. The modified drag can be described by an effective blade length, l e , which is defined as the length of a rigid blade that results in the ...
Jiarui Lei, Heidi Nepf
openaire   +4 more sources

The Abundance of Kelp Is Modified by the Combined Impact of Depth, Waves and Currents [PDF]

Frontiers in Marine Science, 2019
This study analyses the combined impact of two types of ocean water flow, wave exposure and ocean currents, on kelp Laminaria hyperborea abundance, taking other environmental co-variables into account. The dataset covers many ecoregions along the NE Atlantic (Norwegian) coast, including both the Skagerrak, the North Sea and the Norwegian Sea, from 58°N
Bekkby, Trine, Smit, Cecilie, Gundersen, Hege, Rinde, Eli, Steen, Henning, Tveiten, Lise Ann, Gitmark, Janne Kim, Fredriksen, Stein, Albretsen, Jon, Christie, Hartvig C   +9 more
openaire   +6 more sources

Experimental study on local scour around large-diameter submerged cylinders under combined waves and current action

Shui kexue jinzhan, 2019
The characteristics of local scour around large-diameter submerged cylinders are quite different from the non-submerged ones under combined wave and current conditions. Local scour model tests are carried out in a wave-current flume. A submerged cylinder
CHENG Yongzhou, LYU Xing, WANG Wensen, HUANG Xiaoyun, XIA Bo   +4 more
doaj   +1 more source

When blood development meets single-cell transcriptomics

Blood Science, 2019
. Blood cells arise during embryonic development by three temporally distinct waves. Belonging to the third wave, hematopoietic stem cells (HSCs) are generated from hemogenic endothelium via endothelial-to-hematopoietic transition in mid-gestational ...
Jie Zhou, Bing Liu, Yu Lan
doaj   +1 more source

Cohesive sediment erosion in a combined wave-current boundary layer

Journal of Geophysical Research: Oceans, 2020
We conducted field work on the shoals of South San Francisco Bay to elucidate the mechanisms driving cohesive sediment erosion in a shallow, wave- and current-driven flow. Compiling data from three deployments, including measurements taken within the combined wave-current boundary layer, we found that waves were strongly correlated to turbulent ...
Galen Egan, Grace Chang, Samuel McWilliams, Gene Revelas, Oliver Fringer, Stephen Monismith   +5 more
openaire   +1 more source

Predictive Course Control and Guidance of Autonomous Unmanned Sailboat Based on Efficient Sampled Gaussian Process

Journal of Marine Science and Engineering, 2021
In view of the vulnerability of ocean unmanned sailboats to the large lateral velocities due to wind and waves during navigation, this paper proposes a Gaussian Process Model Predictive Control (GPMPC) method based on data-driven learning technique to ...
Yuqin Dong, Nailong Wu, Jie Qi, Xinyuan Chen, Chenhua Hua   +4 more
doaj   +1 more source

Bifurcated Current Sheet Observed on the Boundary of Kelvin-Helmholtz Vortices

Frontiers in Astronomy and Space Sciences, 2021
On May 5, 2017 MMS observed a bifurcated current sheet at the boundary of Kelvin-Helmholtz vortices (KHVs) developed on the dawnside tailward magnetopause. We use the event to enhance our understanding of the formation and structure of asymmetric current
K-J. Hwang, K. Dokgo, E. Choi, J. L. Burch, D. G. Sibeck, B. L. Giles, C. Norgren, T. K. M. Nakamura, T. K. M. Nakamura, D. B. Graham, Y. Khotyaintsev, Q. Q. Shi, D. J. Gershman, C. J. Pollock, R. E. Ergun, R. B. Torbert, C. T. Russell, R. J. Strangeway   +17 more
doaj   +1 more source

ADP‐ribosylation: An emerging regulator of the epigenome

Molecular Oncology, EarlyView.
ADP‐ribosylation has emerged as a dynamic epigenetic signaling mechanism that modifies histones and chromatin‐associated proteins. Through coordinated PARylation and MARylation, it integrates with other histone modifications to regulate chromatin structure, transcription factor activity, and gene expression, influencing genome function and disease ...
Cristel V. Camacho, Chenqian Liu, W. Lee Kraus   +2 more
wiley   +1 more source

An experimental study of weakly nonlinear waves atop a vertically sheared current

Applied Ocean Research
We carry out a laboratory study of weakly nonlinear waves atop a following, vertically sheared current, relevant for a wide range of coastal and ocean locations.
Zirui Xin, Xin Li, Jun Li, Samuel Draycott, Yan Li   +4 more
doaj   +1 more source