Results 11 to 20 of about 1,044,354 (304)

Reliability of non-destructive sonic tomography for detection of defects in old Zelkova serrata (Thunb.) Makino trees

open access: yesForest Science and Technology, 2021
Zelkova serrata (Thunb.) Makino trees, which account for a large proportion of cultural assets and protected trees and have considerable historical and cultural symbolic meaning in South Korea.
Jiwon Son   +4 more
doaj   +1 more source

Using Acoustic Tomography to Infer Stem Wood Quality of Pine Forests Affected by a Fungal Pathogen in Different Latitudinal Regions and Plantation Densities

open access: yesEcologies, 2023
Diplodia pinea is a fungal pathogen that causes Diplodia shoot blight in pines and is widely spread in red pine (Pinus resinosa) and jack pine (Pinus banksiana) forests in Michigan.
Sophan Chhin, Gregory Dahle
doaj   +1 more source

An Explicable Neighboring-Pixel Reconstruction Algorithm for Temperature Distribution by Acoustic Tomography

open access: yesEnergies, 2022
Acoustic process tomography is a powerful tool for monitoring multiphase flow and combustion. However, its capability of revealing details of the interrogation zone is restricted by the ill-posed and rank deficiency problems.
Qirong Qiu   +3 more
doaj   +1 more source

Internal Tree Trunk Decay Detection Using Close-Range Remote Sensing Data and the PointNet Deep Learning Method

open access: yesRemote Sensing, 2023
The health and stability of trees are essential information for the safety of people and property in urban greenery, parks or along roads. The stability of the trees is linked to root stability but essentially also to trunk decay. Currently used internal
Marek Hrdina, Peter Surový
doaj   +1 more source

High resolution acoustic tomography based on backpropagation of waves

open access: yesФизика волновых процессов и радиотехнические системы, 2023
A method of high-resolution acoustic tomography of scattering inhomogeneities based on the method of reverse time migration is proposed. An inhomogeneous background medium with a known distribution of refractive inhomogeneities is considered, where it is
Dmitry Ya. Sukhanov, Anzhela E. Kuzovova
doaj   +1 more source

Deep Learning Convolutional Neural Network Applying for the Arctic Acoustic Tomography Current Inversion Accuracy Improvement

open access: yesJournal of Marine Science and Engineering, 2021
Warm current has a strong impact on the melting of sea ice, so clarifying the current features plays a very important role in the Arctic sea ice coverage forecasting study field.
Kangkang Jin   +6 more
doaj   +1 more source

Ocean acoustic tomography and acoustic propagation [PDF]

open access: yesThe Journal of the Acoustical Society of America, 1986
Ocean acoustic tomography is a method for remotely sensing deterministic and stochastic variations in the ocean sound speed field. The fundamental tomographic measurement is sound speed, and therefore tomography directly provides acoustic propagation models with this essential, first-order, environmental information.
R. C. Spindel, P. F. Worcester
openaire   +1 more source

Analysis of the Static Behavior of a Single Tree on a Finite Element Model

open access: yesPlants, 2021
This work deals with the innovated complex process of tree risk assessment, from precise geometrical tree shape acquisition to building and analyzing a finite element model under specified load.
Ľuboš Moravčík   +2 more
doaj   +1 more source

A Technique of Forced Expiratory Noise Time Evaluation Provides Distinguishing Human Pulmonary Ventilation Dynamics During Long-Term Head-Down and Head-Up Tilt Bed Rest Tests Simulating Micro and Lunar Gravity

open access: yesFrontiers in Physiology, 2018
Estimating the effect of microgravity/hypogravity on pulmonary ventilation function remains topical. Recently developed acoustic techniques based on the evaluation of the forced expiratory noise time (FETa) were hypothesized to be a promising tool for ...
Veronika V. Malaeva   +6 more
doaj   +1 more source

Some Peculiarities of Low-Frequency Hydroacoustic Signals Behavior in Tomographic Studies of “Sea-Land-Sea” System

open access: yesJournal of Marine Science and Engineering, 2022
In this paper, we analyzed the results of experimental data processing in the study of regularities of propagation and transformation of low-frequency harmonic signals at the boundary of the “sea−land−sea” system.
Sergey Budrin   +3 more
doaj   +1 more source

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