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Lead zirconate titanate (PZT) piezoelectric ceramics are widely used functional materials due to their strong and stable piezoelectric properties. A leveling method based on lead zirconate titanate piezoelectric ceramics is proposed for the high level of accuracy required in microelectromechanical fields such as aerospace, industrial robotics, biomedical, and photolithography. A leveling mechanism consisting of core components such as piezoelectric ceramic actuators and sensors is designed. The closed-loop leveling of the working platform is performed using the electromechanical coupling effect of the PZT piezoelectric material. Combined with the theory of the dielectric inverse piezoelectric effect in electric fields, a simulation is used to analyze the four force and deformation cases generated by the drive legs when the load is attached at different positions of the working platform, and the leveling is realized by applying the drive voltage to generate micro-motion displacement. Simulation and calculation results show that the leveling method can reduce the tilt angle of the working platform by 60% when the driving voltage is in the range of 10~150 V. The feasibility of the leveling method and the uniformity of the theoretical calculation and simulation are verified.
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http://dx.doi.org/10.3390/mi16070796 | DOI Listing |
Age Ageing
August 2025
Department of Nursing Health Services Research, Graduate School of Health Care Sciences, Institute of Science Tokyo, Yushima, Bunkyo-ku, Tokyo, Japan.
Background: Little is known about how ambulatory care sensitive condition (ACSC)-related readmissions can be reduced in acute care settings.
Objective: This study examined the association between transitional care for hospitalised older patients with ACSC and ACSC-related readmissions.
Methods: This retrospective observational cohort study included patients aged 65 years and older admitted with ACSC as the primary diagnosis from 1 April 2022 to 31 January 2023, using linked data from the Diagnosis Procedure Combination and the medical functions of the hospital beds database.
Cureus
August 2025
Department of Orthodontic Science, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, Tokyo, JPN.
Purpose Improved superelastic nickel-titanium (Ni-Ti) alloy wires (ISWs) can be used not only for aligning but also for closing the extraction space. The objective of this study was to measure and compare the force and moment generated during mandibular molar protraction using an ISW combined with either short or long hooks under simulated crowded dentition conditions. Materials and methods Assuming crowded dentition following mandibular first premolar extraction, we designed a three-tooth model simulating the canine, the second premolar, and the first molar.
View Article and Find Full Text PDFObjective: To evaluate the diagnostic accuracy of standard postoperative radiographs for identifying mild tibial torsional malalignment (≤ 10°) following tibial plateau leveling osteotomy (TPLO) in dogs.
Methods: Cadaveric hind limbs from medium- to large-breed dogs without radiographic evidence of stifle pathology were used in this ex vivo experimental study. Each limb underwent TPLO, and a custom 3-D-printed guide was used to induce tibial torsion at 0°, 5°, and 10° in internal and external directions.
Am J Emerg Med
August 2025
Department of Emergency Medicine, Yale University School of Medicine, New Haven, CT, USA.
Study Objectives: Emergency Department (ED) crowding is recognized as a national crisis. Load-leveling is the process of transferring patients between campuses in the same hospital system for admission to redistribute patient capacity. Our study evaluates the impact of this load-leveling on ED throughput from the transferred patient perspective and on ED operations to evaluate operational benefits and drawbacks.
View Article and Find Full Text PDFEur J Breast Health
September 2025
Department of Pathology, İstanbul Faculty of Medicine, İstanbul University, İstanbul, Türkiye.
Objective: Sentinel lymph node biopsy (SLNB) is a key procedure for evaluating axillary lymph node status in early breast cancer, offering lower morbidity than axillary lymph node dissection. Intraoperative evaluation (IOE) of sentinel lymph nodes (SLNs) with methods like frozen section (FS) and imprint cytology (IC) aid in making immediate surgical decisions, although IOE accuracy may vary due to several factors.
Materials And Methods: This retrospective study involved 2,528 patients with invasive breast cancer who underwent SLNB at a single institution from 2012 to 2024.