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Potential of accelerometer tags for monitoring of Japanese quail () reproductive behaviour.
Br Poult Sci
November 2024
Instituto de Investigaciones Biológicas y Tecnológicas (IIByT, CONICET-UNC), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Córdoba, Argentina.
1. Monitoring behavioural dynamics in complex animal environments, such as poultry breeding facilities, poses a challenge. Utilising technological approaches, such as accelerometers, offers a solution to assess long-term changes in reproductive activity at an individual bird level.
View Article and Find Full Text PDFPermeability partitioning through the brittle-to-ductile transition and its implications for supercritical geothermal reservoirs.
Nat Commun
September 2024
Laboratory of Experimental Rock Mechanics, School of Architecture, Civil & Environmental Engineering, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland.
Geothermal projects utilizing supercritical water (≥400 °C) could boost power output tenfold compared to conventional plants. However, these reservoirs commonly occur in crustal areas where rocks are semi-ductile or ductile, impeding large-scale fractures and cracking, and where hydraulic properties are largely unknown. Here, we explore the complex permeability of rocks under supercritical conditions using mechanical data from a gas-based triaxial apparatus, high-resolution synchrotron post-mortem 3D imagery, and finite element modeling.
View Article and Find Full Text PDFPre-Failure Strain Localization in Siliclastic Rocks: A Comparative Study of Laboratory and Numerical Approaches.
Rock Mech Rock Eng
June 2024
Swiss Seismological Service, ETH Zurich, Zurich, Switzerland.
We combined novel laboratory techniques and numerical modeling to investigate (a)seismic preparatory processes associated with deformation localization during a triaxial failure test on a dry sample of Berea sandstone. Laboratory observations were quantified by measuring strain localization on the sample surface with a distributed strain sensing (DSS) array, utilizing optical fibers, in conjunction with both passive and active acoustic emission (AE) techniques. A physics-based computational model was subsequently employed to understand the underlying physics of these observations and to establish a spatio-temporal correlation between the laboratory and modeling results.
View Article and Find Full Text PDFHelical Gearbox Defect Detection with Machine Learning Using Regular Mesh Components and Sidebands.
Sensors (Basel)
May 2024
Faculty of Industrial Engineering, Robotics and Production Management, Technical University of Cluj-Napoca, 400114 Cluj-Napoca, Romania.
The current paper presents helical gearbox defect detection models built from raw vibration signals measured using a triaxial accelerometer. Gear faults, such as localized pitting, localized wear on helical pinion tooth flanks, and low lubricant level, are under observation for three rotating velocities of the actuator and three load levels at the speed reducer output. The emphasis is on the strong connection between the gear faults and the fundamental meshing frequency GMF, its harmonics, and the sidebands found in the vibration spectrum as an effect of the amplitude modulation (AM) and phase modulation (PM).
View Article and Find Full Text PDFWalking more, not faster, is associated with bone health in China of community-dwelling older women:A cross-sectional study.
Prev Med
October 2023
School of Physical Education, Shandong University, 17922 Jingshi Road, Lixia District, Jinan City, Shandong Province 250061, China. Electronic address:
Aims: To examine the association between daily steps and step intensity with bone health in Chinese community-dwelling older women.
Methods: Data from 1116 women in the Physical Activity and Health in Older Women Study in China, 2021. Three bone parameters: bone quality index (BQI), speed of sound (SOS), and broadband ultrasound attenuation (BUA) were measured in the left heel using an ultrasound bone densitometer and transformed into dichotomous variables from medians.
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