Results 131 to 140 of about 4,299 (279)

“Cold Tropics”: Permafrost Existence and Thickness on Eastern Nevado Coropuna (Southern Peruvian Andes) Revealed by Ground‐Penetrating Radar and Geoelectrical Soundings

Permafrost and Periglacial Processes, EarlyView.
ABSTRACT The existence of permafrost was explored at tropical latitude on Nevado Coropuna (southern Peruvian Andes) using a combination of ground‐penetrating radar (GPR) and vertical electrical sounding (VES) in order to strengthen the mutual validation of data processing and interpretation.
Velnia Chacca, Ramón Pellitero, Adriano Ribolini, José Úbeda, Luis Mariano del Río, Ricardo Vila, Oscar Vilca   +6 more
wiley   +1 more source

L’astronomia gravitazionale: in ascolto dei sussurri dell’universo [PDF]

S&F_scienzaefilosofia.it, 2017
Gravitational astronomy: listening to the whispers of the universe It was about 10 am, Greenwich time, on September 14th 2015 when scientists detected something which had never been detected before: the “sound” of two colliding black holes which, after ...
ALLOCCA, ANNALISA
doaj  

State-space algorithm for detecting the nanohertz gravitational wave background

Monthly Notices of the Royal Astronomical Society
ABSTRACT The stochastic gravitational wave background (SGWB) can be observed in the nanohertz band using a pulsar timing array (PTA). Here, a computationally efficient state-space framework is developed for analysing SGWB data, in which the stochastic gravitational wave strain at Earth is tracked with a non-linear Kalman filter and ...
Tom Kimpson, Andrew Melatos, Joseph O’Leary, Julian B Carlin, Robin J Evans, William Moran, Tong Cheunchitra, Wenhao Dong, Liam Dunn, Julian Greentree, Nicholas J O’Neill, Sofia Suvorova, Kok Hong Thong, Andrés F Vargas   +13 more
openaire   +2 more sources

Epistemic diversity and the politics of knowledge in plant disease management: Insights from the Xylella fastidiosa epidemic in southern Italy

PLANTS, PEOPLE, PLANET, EarlyView.
Xylella fastidiosa is a major plant pathogen affecting crops such as grapes, citrus, almonds, and olives, with potentially severe consequences for agricultural production and rural livelihoods worldwide. This paper examines the conflict around the management of the X. fastidiosa outbreak affecting olive trees in southern Italy.
Fabio Gatti, David Ludwig, Phil Macnaghten   +2 more
wiley   +1 more source

Time delay interferometry combination with zero-response

Results in Physics
In space-based gravitational wave detection, gravitational wave signals are detected by measuring the Doppler frequency shift of laser exchange between three satellites.
Pan-Pan Wang, Xiao-Yu Lu, Xin-Lei Zhao, Hao-Kang Chen, Jing Zhou, Weisheng Huang, Yu-Jie Tan, Han-Zhong Wu, Cheng-Gang Shao   +8 more
doaj   +1 more source

Near‐resonant excitation of the Adriatic barotropic modes: The seiche events of December 2019

Quarterly Journal of the Royal Meteorological Society, EarlyView.
This study examines severe flooding in the northern Adriatic Sea in December 2019, which existing forecasting systems failed to predict. Analysis of wind and sea‐level data, alongside reanalysis datasets and a high‐resolution hydrodynamic model, revealed a wind‐induced resonance mechanism.
Marco Bajo, Luca Arpaia, Christian Ferrarin, Mirko Orlić   +3 more
wiley   +1 more source

Forecast‐Error Diagnostics in Neural Weather Models

Quarterly Journal of the Royal Meteorological Society, EarlyView.
Deep learning weather prediction models enable efficient forecast‐error diagnostics through auto‐differentiation and low computational cost. We apply grid‐point relaxation and gradient‐based error sensitivity to identify key forecast‐error sources. Results show that medium‐range forecasts in the midlatitudes benefit most from relaxing the stratosphere ...
Uroš Perkan, Gregor Skok, Žiga Zaplotnik   +2 more
wiley   +1 more source

High-Performance Telescope System Design for Space-Based Gravitational Waves Detection

Sensors
Space-based gravitational wave (GW) detection employs the Michelson interferometry principle to construct ultra-long baseline laser interferometers in space for detecting GW signals with a frequency band of 10−4–1 Hz.
Huiru Ji, Lujia Zhao, Zichao Fan, Rundong Fan, Jiamin Cao, Yan Mo, Hao Tan, Zhiyu Jiang, Donglin Ma   +8 more
doaj   +1 more source

The role of the synoptic‐scale conditions in driving fog and mist during the FATIMA July 2022 Sable Island Field program

Quarterly Journal of the Royal Meteorological Society, EarlyView.
ERA5 hourly 325‐m and 1512‐m (a) convergence and (b) vertical motion (actually pressure change with sign reversed to compare with convergence) over Sable Island around the time of an event. The mist (green) and fog (red) occurrences at the surface station are shown at the bottom of the figures. A 325‐m fitted line convergence was positive for the first
Clive E. Dorman, Darko Koračin, Reneta Dimitrova, Ismail Gultepe, Sebastian W. Hoch, Jesus Ruiz‐Plancarte, Qing Wang, Alexei Perelet, H. J. S. Fernando   +8 more
wiley   +1 more source

Multi-frequency signal acquisition and phase measurement in space gravitational wave detection

To enhance the accuracy of phase measurement and to prevent tracking errors, it is crucial to effectively read the multi-frequency signal in space gravitational wave detection.
张强涛, 刘河山, 罗子人, Dong, Peng, 李磐   +4 more
core   +2 more sources