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This study investigates the use of symbolic computation in Matrix Structural Analysis (MatSA) for continuous beams, using the MATLAB Symbolic Math Toolbox. By employing symbolic MatSA, analytical expressions for displacements, support reactions, and internal forces are derived, offering deeper insights into structural behavior. This approach facilitates efficient and scalable sensitivity analysis, where partial derivatives of outputs concerning input parameters can be directly computed, enhancing design exploration. The development includes an open-source MATLAB program, hosted on GitHub, enabling symbolic analysis of continuous beams subjected to point and uniform loads. This approach is valuable for both engineering practice and pedagogy, enriching the understanding of structural mechanics and aiding in education by illustrating clear parameter relationships. The program supports deriving influence lines and identifying maximum response values.
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http://dx.doi.org/10.1038/s41598-025-98023-x | DOI Listing |
Nanophotonics
August 2025
Key Laboratory of Opto-Electronics Information Technology (Tianjin University), Ministry of Education, School of Precision Instruments and Opto-Electronics Engineering, Tianjin, 300072, China.
Vortex beams, characterized by orbital angular momentum (OAM), hold significant potential in optical communications, quantum information processing, and optical manipulation. However, existing metasurface designs are largely confined to single-degree-of-freedom control, such as static OAM generation or fixed focal points, which limiting their ability to integrate polarization multiplexing with dynamic focal tuning. To address this challenge, we propose a tunable multifunctional cascaded metasurface that synergizes polarization-sensitive phase engineering with interlayer rotational coupling, overcoming conventional device limitations.
View Article and Find Full Text PDFNat Commun
August 2025
Max Planck Institute for Medical Research, Heidelberg, Germany.
The ability to dynamically shape ultrasound fields is critical for emerging applications in therapeutic ultrasound, particle manipulation and tissue engineering. While existing phased arrays provide beam steering for imaging, these newer applications require higher intensities. This complicates the electrical driving and ultimately limits the array size and spatial complexity of the field.
View Article and Find Full Text PDFAccid Anal Prev
October 2025
Department of Civil and Environmental Engineering, The University of Tennessee, Knoxville, TN, United States. Electronic address:
The alarming increase in pedestrian fatalities highlights the urgent need for effective protection technologies. One such technology is the Pedestrian Automatic Emergency Braking (P-AEB) system, a driver assistance feature that provides temporary braking support to help prevent crashes. Despite their availability, the effectiveness of the P-AEB system varies significantly, necessitating continuous performance evaluations under various conditions, especially during nighttime, when 75% of fatal pedestrian crashes occur.
View Article and Find Full Text PDFPLoS One
August 2025
Oral and Maxillofacial Prosthodontics, King Abdulaziz University, Jeddah, Saudi Arabia.
Denture base fractures are a common issue, particularly in overdentures, necessitating high fracture toughness in denture base polymers to withstand oral mechanical loads. Despite the importance of fracture resistance, current denture base materials often fall short of meeting the required standards. The literature shows conflicting results regarding the fracture toughness of three-dimensional (3D)-printed materials compared to conventional and milled options.
View Article and Find Full Text PDFNano Lett
September 2025
School of Physics, Central South University, Changsha 410083, China.
Optical tweezers, with noncontact and high-precision manipulation, offer unique advantages in micro-nano mechanics and microfluidics. Here, we demonstrate an all-optical microgear transmission strategy based on dynamically assembled microrotors driven by vortex beams. The microrotors driven by the optical torque of vortex beams can generate localized flow fields, combined with optical forces and interparticle friction, forming a coupled transmission mechanism for angular momentum transfer.
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