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Online detection and evaluation of early fatigue cracks using sideband peak intensity technique with frequency-mismatched excitation pulse-echo method.
Ultrasonics
December 2024
Department of Civil and Architectural Engineering and Mechanics, University of Arizona, Tucson, AZ 85721, USA.
This work presents a nonlinear ultrasonic (NLU) technique called sideband peak intensity (SPI) combining an improved pulse-echo (PE) experimental method for online detection and evaluation of fatigue cracks at their early stages. Advantages of the proposed technique are that it enjoys the high sensitivity and ease of application of NLU SPI technique and easy implementation of the PE experimental method. The PE experimental method is improved by adopting frequency-mismatched excitations to enhance the sensitivity and robustness of the SPI technique.
View Article and Find Full Text PDFIdentify devices and events from non-IP heterogeneous IoT network traffic.
PeerJ Comput Sci
October 2024
Fujian Police College, Collaborative Innovation Research Center of Intelligent Policing, Fu Zhou, Fu Jian, China.
In recent years, notable advancements have been achieved in the realm of identifying IP-based Internet of Things (IoT) devices and events. Nevertheless, the majority of methods rely on extracting fingerprints or features from plain text IP-based packets, which limits their ability to accommodate heterogeneous IoT devices such as ZigBee and Z-Wave, and fails to address the challenge of limited traffic samples. To tackle these issues, we propose a novel approach based on IoT communication characteristics and featuring module extensibility.
View Article and Find Full Text PDFBifurcation analysis and control of the full velocity difference model with delayed velocity difference.
Eur Phys J E Soft Matter
December 2024
College of Electrical Engineering, Lanzhou Institute of Technology, Lanzhou, 730050, Gansu, China.
With the increase in the number of urban vehicles, various traffic problems have gradually emerged. Studying the causes of traffic congestion and proposing effective mitigation strategies have important practical significance. This paper proposes a macroscopic traffic flow model that considers the delayed speed difference.
View Article and Find Full Text PDFWhat is the role of leisure-time physical activity in the association between neighborhood environmental characteristics and hypertension in older adults? The EpiFloripa Aging Cohort study.
Prev Med Rep
November 2024
Postgraduation Program in Physical Education, Federal University of Santa Catarina, R. Eng. Agronômico Andrei Cristian Ferreira, s/n - 88040-900, Florianópolis, Brazil.
Article Synopsis
- This study investigates how perceived neighborhood characteristics affect blood pressure in older adults, focusing on the role of walking as a mediator.
- Data from the EpiFloripa Aging Cohort Study revealed that older adults with better infrastructure, safety, and overall neighborhood perceptions are less likely to report hypertension.
- Results indicate that promoting safe environments for physical activity could be crucial for preventing and managing hypertension among older adults.
Study on terrain acquisition and processing technology of BDS-3 auxiliary mountain highway.
Sci Rep
October 2024
Guangxi Road and Bridge Engineering Group Co., LTD, Nanning, China.
Article Synopsis
- * It introduces a solution that combines BDS-assisted (BeiDou Navigation Satellite System) terrain acquisition with advanced signal tracking and multi-antenna positioning techniques.
- * A case study is presented, demonstrating the successful collection and reconstruction of 3D terrain data over a 100 km mountain road using innovative airborne and ground-based methods.
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