A novel 1-3-2 type piezoelectric composite is developed. There are piezoelectric ceramic framework supports at transverse and longitudinal directions in its structure, so it is free from the influence of any outside mechanic impact and environmental temperature change. The sample characteristic is good coherence. It has many advantages, such as a high piezoelectricity, lower density and acoustic impedance matching with water and tissue easily. Based on Newnham's series and parallel theory of composites, the calculation formulae of dielectric and piezoelectric constants of a 1-3-2 type piezoelectric composite are deduced. The sample's characteristics indicate that a 1-3-2 type piezoelectric composite's theoretic calculation values are in good agreement with the measurement results. Element samples have been designed, manufactured and measured. The results indicate that the resonant frequency, resonant impedance, piezoelectricity and static capacity of these samples are stable. It is easy to design sensor array elements using this material.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.ultras.2006.05.138 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Prevalence and morphology of middle mesial canals in mandibular first molars and their relationship with anatomical aspects of the mesial root: a CBCT analysis.
BMC Oral Health
January 2025
Department of Endodontics, Shaanxi Provincial People's Hospital, Xi'an, China.
Background: This study aims to investigate the prevalence and morphology of middle mesial canal (MMC) in mandibular first molar (M1M) among a Northwestern Chinese population, and to analyze their relationship with anatomical aspects of the mesial root.
Methods: Cone beam computed tomography (CBCT) was utilized to evaluate 898 M1Ms and assess the incidence and morphology of MMC. The following parameters for M1M with or without MMC were obtained: the vertical distance between the first appearance of MMC and canal orifices (D), the distance between mesiobuccal (MB) and mesiolingual (ML) canals (D1), the buccolingual width(L1) and mesiodistal width (L2) of mesial roots, and the flatness degree(L1/L2) of mesial roots.
Isolation of a planar π-aromatic Bi ring in a cobalt-based inverse-sandwich-type complex.
Nat Chem
January 2025
Institute of Nanotechnology, Karlsruhe Institute of Technology, Karlsruhe, Germany.
Monocyclic π-aromatic compounds are ubiquitous throughout almost all fields of natural sciences-as synthons in industrial processes, as ligands of metal complexes for catalysis or sensing and as bioactive molecules. Planar organocycles stand out through their specific way of overcoming electron deficiency by a non-localizable set of (4n + 2)π electrons. By contrast, all-metal aromatic monocycles are still rare, as metal atoms prefer to form clusters with multiply bonded atoms instead.
View Article and Find Full Text PDFPrognostic value of changes in vibration-controlled transient elastography parameters for liver, cardiovascular and mortality outcomes in individuals with type 2 diabetes and metabolic dysfunction-associated steatotic liver disease: The Rio de Janeiro type 2 diabetes cohort.
Diabetes Obes Metab
January 2025
Department of Internal Medicine, University Hospital Clementino Fraga Filho, School of Medicine, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil.
Background/aims: The prognostic importance of changes in vibration-controlled transient elastography (VCTE) parameters, liver stiffness measurement (LSM), and controlled attenuation parameter (CAP), in individuals with type 2 diabetes (T2D) and metabolic dysfunction-associated steatotic liver disease (MASLD) is unknown.
Methods: A prospective cohort of 288 patients underwent 2 VCTE exams at least 2 years apart, and the relative percentage changes in LSM and CAP were calculated. Outcomes were the occurrence of any liver-related events (LREs), cardiovascular events (CVEs), and all-cause mortality.
Sun Exposure and Type 2 Diabetes Mellitus: A Prospective Follow-up Cohort Study from Southern Sweden.
Anticancer Res
January 2025
Endocrinology, Clinical Sciences, Lund University Hospital, Lund University, Lund, Sweden.
Background/aim: An inverse association exists between type 2 diabetes mellitus (T2DM) and both plasma vitamin D levels and sun exposure, but vitamin D supplementation does not reduce the incidence. We sought to assess whether there is a dose-dependency in the association between sun exposure and T2DM.
Patients And Methods: The melanoma in Southern Sweden (MISS) cohort is comprised of one thousand women without cancer from age groups between 25 and 64, drawn from the Southern Swedish Population Registry of 1990 by random selection.
High-Entropy Thermistor Ceramics (LaNd)(ZrSn)O ( = Sm, Eu, Gd, or Dy) with High Sensitivity for High-Temperature Measurements.
Sensors (Basel)
November 2024
Xinjiang Key Laboratory of Electronic Information Materials and Devices, Xinjiang Technical Institute of Physics and Chemistry of CAS, Urumqi 830011, China.
A series of high-entropy pyrochlore ceramics, specifically (LaNd)(ZnSn)O ( = Sm, Eu, Gd, or Dy), have been synthesized using the solid-state reaction method. Their potential as high-temperature thermistors was investigated by analyzing electrical and aging properties at elevated temperatures. Characterization using X-ray diffraction, scanning electron microscopy, and Raman spectroscopy confirms that these ceramics are dense, single-phase solid solutions with a pyrochlore structure.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!