Results 51 to 60 of about 3,618 (152)

Wearable Movement‐Tracking for Prodromal Parkinson's Disease Detection: A Cross‐Country Validation Study

Movement Disorders, EarlyView.
Abstract Background Models trained on accelerometer data have been proposed for detecting prodromal Parkinson's disease (PD). However, uncertainties in diagnosis timing in the UK Biobank (UKBB) may affect generalizability to other cohorts. Objectives The aim of the study was to evaluate the performance of previously published models for prodromal PD ...
Fabian Kahl, Ann‐Kathrin Schalkamp, Katarina Mary Gunter, Anja Ophey, Sinah Röttgen, Jamil Razzaque, Konstantin Kufer, Cynthia Sandor, Gereon R. Fink, Elke Kalbe, Walter Maetzler, Clint Hansen, Stephan M. Jonas, Michele T. Hu, Lara Marie Reimer, Michael Sommerauer   +15 more
wiley   +1 more source

Beyond Directions: Symmetry‐Aware Rotation Sets for Triaxial Diffusion Encoding by Geometric Filter Optimization

Magnetic Resonance in Medicine, EarlyView.
ABSTRACT Purpose To improve the accuracy of diffusion‐weighted powder average signals for diffusion encoding with arbitrary b‐tensors. Methods We identify an intrinsic dihedral (D2$$ {D}_2 $$) symmetry of diffusion signals for arbitrary diffusion encoding, which defines their natural signal space (a quotient of 3D rotations).
Sune Nørhøj Jespersen, Filip Szczepankiewicz   +1 more
wiley   +1 more source

Development and validation of three-way rigid true triaxial apparatus for soils

Yantu gongcheng xuebao
The intermediate principal stresses have a significant effect on the stress-strain behavior of soils. To describe the stress-strain behavior of soils more accurately, it is necessary to carry out true triaxial tests in the field of soil mechanics.
SHAO Shengjun 1, 2, WANG Zechi 1, SHAO Shuai 1, WU Hao 1, ZHANG Shaoying 1
doaj   +1 more source

Deformation characteristics of coarse granular materials in large-scale true triaxial tests

Yantu gongcheng xuebao, 2019
The deformation behaviors of coarse granular materials under three-dimensional stress state are crucial to the settlement of earth-rockfill dams. A series of tests under constant minor principle stress and constant coefficient of intermediate principle ...
ZUO Yong-zhen 1, JIANG Jing-shan 2, 1, PAN Jia-jun 1, ZHAO Na 1, ZHOU Yue-feng 1
doaj   +1 more source

Fault Detection of Electric Motors via Symmetrized Dot Pattern‐Based Features

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT This study proposes a novel symmetrized dot pattern (SDP) approach using designed SDP‐based features, extracted from transformed vibration signals, for fault detection. These features describe the compactness, inclination, and shape of the “snowflake” diagram distributions.
Mario Spirto, Pierangelo Malfi, Armando Nicolella, Francesco Melluso, Chiara Cosenza, Sergio Savino, Vincenzo Niola   +6 more
wiley   +1 more source

Method Improvement and Effect Analysis of Triaxial Compression Acoustic Emission Test for Coal and Rock

Advances in Civil Engineering, 2019
In the study of the acoustic emission (AE) characteristics of rock samples or coal samples under triaxial compression conditions, most scholars carry out relevant experiments by placing the AE detector on the outer wall of the triaxial chamber of the ...
Yan Zhou, Chuanxiao Liu, Depeng Ma
doaj   +1 more source

Effects of Ambient Moisture and Large‐Strain Dynamic Preloading on the Dynamic Properties of the EAC‐1A Regolith Simulant

International Journal for Numerical and Analytical Methods in Geomechanics, EarlyView.
ABSTRACT The EAC‐1A lunar mare simulant, a silty sand, was selected by the European Astronaut Center (EAC) for use in the LUNA analogue facility's lunar simulation testbed. Its stress‐ and strain‐dependent shear modulus and damping ratio were determined via resonant column testing on specimens prepared either from ambient moisture material or oven ...
Christos Vrettos
wiley   +1 more source

An Improved True Triaxial Hoek–Brown Strength Criterion

工程科学与技术, 2023
Hoek–Brown strength criterion has been widely used in rock and rock mechanics analysis, rock slope stability analysis, rock tunnel design, and other fields, but the conventional Hoek–Brown strength criterion does not consider the influence of ...
Xiangchao SHI, Qingling LI, Jianfeng LIU, Leiyu GAO, Xiao ZHUO   +4 more
doaj  

Fiber Bragg Grating Force Sensors for Minimally Invasive Surgery: State of the Art, Challenges, and Opportunities

SmartBot, EarlyView.
This article reviews the application of fiber Bragg grating (FBG) technology for precise force sensing in minimally invasive surgery. It outlines the fundamental working principles and algorithms used to interpret sensor data. The text surveys clinical applications across various medical fields, such as ophthalmology and vascular intervention (Table of
Shiyuan Dong, Tianqi Huang, Lingyu Chen, Shucong Yin, Qing Chang, Dingpei Han, Yangxi Li, Boyu Zhang, Hongen Liao, Fang Chen   +9 more
wiley   +1 more source

Effect of Double Annealing on the Microstructure and Mechanical Properties of a Medium Manganese Steel

steel research international, EarlyView.
A double intercritical annealing strategy is proposed to tailor the multiphase microstructure and mechanical response of a medium‐Mn steel. The treatment produces an ultrafine mixture of ferrite, martensite and multiple austenite populations with graded thermal and mechanical stability, formed through austenite reversion and controlled retransformation.
Mattia Franceschi, Jose A. Jimenez, Carlos Garcia‐Mateo, Radhakanta Rana   +3 more
wiley   +1 more source