Results 71 to 80 of about 47,269 (283)

Digital Twin‐Based Optimization of Service Availability in LEO Mega Constellations Considering Handover Delays in Open RAN

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT As non‐terrestrial networks (NTNs) become integral to future 6G systems, ensuring seamless connectivity and service continuity over low Earth orbit (LEO) satellite constellations is essential. This work investigates the impact of open radio access network (RAN) functional splits on handover performance in NTNs, focusing on minimizing service ...
Siva Satya Sri Ganesh Seeram, Luca Feltrin, Mustafa Ozger, Cicek Cavdar   +3 more
wiley   +1 more source

Giant pockmarks discovered on the West Greenland shelf

Arctic, Antarctic, and Alpine Research
Pockmarks provide valuable insights into subsurface fluid dynamics, methane release, and potential geohazards. We present the first detailed mapping and characterization of giant pockmarks (>250 m diameter) on the West Greenland continental shelf using ...
Diana W. Krawczyk, Christine L. Batchelor, Aqqaluk D. Sørensen, Jens Lowag   +3 more
doaj   +1 more source

Establishing a Multibeam Sonar Evaluation Test Bed near Sidney, British Columbia [PDF]

, 2012
The Canadian Hydrographic Service (CHS), Naval Oceanographic Office (NAVOCEANO) and the Ocean Mapping Group of the University of New Brunswick (OMG) collaborated on establishing a multibeam sonar test bed in the vicinity of the Institute of Ocean ...
Beaudoin, Jonathan, Clarke, J.E. Hughes, Hare, Rob, Whittaker, Clay   +3 more
core   +2 more sources

Pre‐failure behavior of continuous post‐tensioned and post‐grouted beam in case of tendon failure

Structural Concrete, EarlyView.
Abstract Grouted tendons are a common solution for long‐span bridge structures. The grout provides bond and corrosion protection for prestressing steel. However, if the grouting is defective, corrosion of the prestressing steel may initiate and eventually lead to tendon failure.
Olli Asp, Joonas Tulonen, Anssi Laaksonen   +2 more
wiley   +1 more source

The magic project: genesis, implementation, and results

Journal of Maps
The Magic Project was conceived following a submarine-generated tsunami at Stromboli in 2002. Recognizing the lack of knowledge on submarine geohazards, the Italian Civil Protection Department launched the project in 2007, aiming to map marine geohazards
Francesco L. Chiocci
doaj   +1 more source

Fish welfare in a changing world: New developments and current challenges

Journal of Fish Biology, EarlyView.
Abstract The welfare of non‐human animals is central to ethical discussions on animal use, with increasing attention to fish welfare across research, aquaria, aquaculture, and fisheries. This paper reviews current theoretical approaches to animal welfare and recent advances in defining and assessing fish welfare since the seminal paper by Huntingford ...
Sonia Rey Planellas, João L. Saraiva, Eliane Gonçalves‐de‐Freitas, Pablo Arechavala‐Lopez, Bernice Bovenkerk, Michael Breen, Steven J. Cooke, Martin Føre, Lene Northwood, Lars Helge Stien, Sunil Kadri, Chris Noble, Jonatan Nilsson, Fernando Rodriguez, Cosme Salas, Peter Sandøe, Hans van de Vis   +16 more
wiley   +1 more source

Multibeam Characteristics of a Negative Refractive Index Shaped Lens

Sensors, 2020
Narrow beam width, higher gain and multibeam characteristics are demanded in 5G technology. Array antennas that are utilized in the existing mobile base stations have many drawbacks when operating at upper 5G frequency bands. For example, due to the high
Salbiah Ab Hamid, Nurul Huda Abd Rahman, Yoshihide Yamada, Phan Van Hung, Dinh Nguyen Quoc   +4 more
doaj   +1 more source

Variability of Natural Methane Bubble Release at Southern Hydrate Ridge

Geochemistry, Geophysics, Geosystems, 2021
Current estimations of seabed methane release into the ocean (0.4–48 Tg yr−1) are based on short‐term observations and implicitly assume that fluxes are constant over time.
Yann Marcon, Deborah Kelley, Blair Thornton, Dana Manalang, Gerhard Bohrmann   +4 more
doaj   +1 more source

E/V Nautilus EM302 Multibeam Echosounder System Review [PDF]

, 2014
Introduction The E/V Nautilus undertook leg NA040 to perform a review of the vessel’s Kongsberg EM302 multibeam echosounder in the vicinity of the continental shelf break offshore of St. Petersburg, Florida, from May 4-9, 2014 (Fig. 1).
Jerram, Kevin W., Johnson, Paul D
core   +2 more sources

Secure Satellite Communication Systems Design with Individual Secrecy Rate Constraints

, 2011
In this paper, we study multibeam satellite secure communication through physical (PHY) layer security techniques, i.e., joint power control and beamforming.
Han, Zhu, Hjørungnes, Are, Lei, Jiang, Vázquez-Castro, M. A.   +3 more
core   +1 more source