Results 41 to 50 of about 1,666,400 (302)

Blending single beam RoxAnn and multi-beam swathe QTC hydro-acoustic discrimination techniques for the Stonehaven area, Scotland, UK [PDF]

, 2011
Surface properties of the seabed in a 180 km2 area of coastal waters (14-57 m depth) off northeast Scotland were mapped by hydro-acoustic discrimination using single and multi-beam echosounders linked to signal processing systems (RoxAnn for the single ...
Armstrong, F., Heath, Michael, Serpetti, N., Witte, U.   +3 more
core   +1 more source

Soundscape components inform acoustic index patterns and refine estimates of bird species richness

Frontiers in Remote Sensing, 2023
Ecoacoustic monitoring has proliferated as autonomous recording units (ARU) have become more accessible. ARUs provide a non-invasive, passive method to assess ecosystem dynamics related to vocalizing animal behavior and human activity.
Colin A. Quinn, Patrick Burns, Christopher R. Hakkenberg, Leonardo Salas, Bret Pasch, Scott J. Goetz, Matthew L. Clark   +6 more
doaj   +1 more source

Stereophonic acoustic echo cancellation employing selective-tap adaptive algorithms [PDF]

, 2006
Published ...
Khong,A.W.H., Naylor,P.A.
core   +1 more source

Forest edge structure from terrestrial laser scanning to explain bird biophony characteristics from acoustic indices

Remote Sensing in Ecology and Conservation, 2023
Forest edges can be important strongholds for biodiversity and play a crucial role in the protection of forest interiors against edge effects. However, their potential to host biodiversity is dependent on the structure of the forest: Abrupt edges often ...
Tom E. Verhelst, P. Vangansbeke, P. De Frenne, B. D'hont, Q. Ponette, Luc Willems, H. Verbeeck, K. Calders   +7 more
semanticscholar   +1 more source

Influence of recording devices and environmental noise on acoustic index scores: Implications for bird sound-based assessments

Ecological Indicators
Passive acoustic monitoring serves as a minimally invasive and effective method for biodiversity assessment, particularly in bird monitoring through the application of acoustic indices.
Chengyun Zhang, Yue Zhang, Xinjun Zheng, Xinghui Gao, Zezhou Hao   +4 more
doaj   +1 more source

Acoustic Sensor-Based Soundscape Analysis and Acoustic Assessment of Bird Species Richness in Shennongjia National Park, China

Sensors, 2022
Passive acoustic sensor-based soundscape analysis has become an increasingly important ecological method for evaluation of ecosystem conditions using acoustic indices. Understanding the soundscape composition and correlations between acoustic indices and
Yanan Hou, Xinwen Yu, Jingyuan Yang, Xuan Ouyang, Dongpu Fan   +4 more
doaj   +1 more source

Basal Chromospheric Flux and Maunder Minimum-type Stars: The quiet-Sun Chromosphere as a Universal Phenomenon

, 2012
Aims: We demonstrate the universal character of the quiet-Sun chromosphere among inactive stars (solar-type and giants). By assessing the main physical processes, we shed new light on some common observational phenomena.
Baliunas, Brandenburg, Buchholz, Cuntz, Cuntz, Duncan, Hall, Hauschildt, J. H. M. M. Schmitt, Judge, Judge, Judge, Judge, K.-P. Schröder, Keppens, Konstantinova-Antova, M. Cuntz, M. I. Pérez Martínez, M. Mittag, Mittag, Pasquini, Pevtsov, Pérez Martínez, Rammacher, Riethmüller, Schmitt, Schrijver, Schrijver, Schrijver, Schrijver, Schröder, Schröder, Schröder, Schwarzschild, Strassmeier, Stȩpień, Suzuki, Vögler, White, Wöger   +39 more
core   +1 more source

Nonlinear evolution equations for degenerate transverse waves in anisotropic elastic solids

, 2008
Transverse elastic waves behave differently in nonlinear isotropic and anisotropic media. Quadratically nonlinear coupling in the evolution equations for wave amplitudes is not possible in isotropic solids, but such a coupling may occur for certain ...
Andrew N. Norris, Bengt Enflo, Claes M. Hedberg, Leif Kari, Włodzimierz Domański   +4 more
core   +1 more source

Multi-Index Ecoacoustics Analysis for Terrestrial Soundscapes: A New Semi-Automated Approach Using Time-Series Motif Discovery and Random Forest Classification

Frontiers in Ecology and Evolution, 2021
High rates of biodiversity loss caused by human-induced changes in the environment require new methods for large scale fauna monitoring and data analysis.
Marina D. A. Scarpelli, Benoit Liquet, Benoit Liquet, David Tucker, Susan Fuller, Paul Roe   +5 more
doaj   +1 more source

Timing is everything: Drivers of interannual variability in blue whale migration. [PDF]

, 2020
Blue whales need to time their migration from their breeding grounds to their feeding grounds to avoid missing peak prey abundances, but the cues they use for this are unknown.
Ballance, Lisa T, Franks, Peter JS, Hildebrand, John A, Ohman, Mark D, Rice, Ally, Szesciorka, Angela R, Širović, Ana   +6 more
core