Piezoelectric cellular polypropylene films, so-called ferroelectrets, are assembled in a stack with two active transducer layers. The stack is characterized with respect to its linear and quadratic response in a frequency range from 1 kHz to 80 kHz. A relatively smooth frequency response in the sound-pressure level is found for the individual layers as well as for both layers driven in phase. The piezoelectric response of the two-layer stack is twice the response of an individual layer over a rather broad frequency range. Furthermore, the influence of the preparation conditions on the resonance frequency and the effect of the quadratic distortion on the radiated sound are investigated both for the individual transducer films in the stack and for the stack system as a whole.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1109/tuffc.2005.1516033 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Production and Characterization of Oil-Loaded, Semi-Resorbable, Tri-Layered Hernia Mesh.
Polymers (Basel)
January 2025
Institute of Graduate Studies, Bioengineering Division, Tokat Gaziosmanpaşa University, 60250 Tokat, Türkiye.
Hernia repair is the most common surgical operation applied worldwide. Mesh prostheses are used to support weakened or damaged tissue to decrease the risk of hernia recurrence. However, the patches currently used in clinic applications have significant short-term and long-term risks.
View Article and Find Full Text PDFImpact of Heterosigma akashiwo on the environmental behavior of microplastics: Aggregation, sinking, and resuspension dynamics.
J Hazard Mater
January 2025
Ecological Risk Research Department, KIOST, Geoje 53201, Republic of Korea; Department of Ocean Science, University of Science and Technology (UST), Daejeon 34113, Republic of Korea. Electronic address:
Aggregation processes of microalgae have significant effects on the vertical distribution of microplastics (MPs) in the marine environment. This study explored how the harmful microalga Heterosigma akashiwo affects the aggregation and sinking characteristics of four types of MPs: low and high-density polyethylene (PE) spheres, and small and large polypropylene (PP) fragments. The aggregation of MPs was primarily driven by extracellular polymeric substances (EPS) rather than direct attachment to the cells, contributing to their sinking.
View Article and Find Full Text PDFNatural deep eutectic solvent-based liquid phase microextraction in a 3D-Printed millifluidic flow cell for the on-line determination of thiabendazole in juice samples.
Anal Chim Acta
February 2025
Departamento de Medio Ambiente y Agronomía, INIA-CSIC, Carretera de A Coruña km. 7.5, 28040, Madrid, Spain. Electronic address:
Background: At present, 3D printing technology is becoming increasingly popular in analytical chemistry because it enables the rapid and cost-effective manufacture of sample preparation devices, particularly in flow-based operation, opening up new opportunities for the development of automated analytical methods. In parallel, the use of miniaturized methods and sustainable solvents in sample preparation is highly recommended. Accordingly, in this work, a 3D-printed millifluidic device was designed and used for the on-line natural deep eutectic solvent (NADES)-based liquid phase microextraction (LPME) coupled to a spectrofluorometer for, as a proof of concept, the determination of thiabendazole (TBZ) in fruit juice samples.
View Article and Find Full Text PDFToxicity assessment of DMSO extracts of environmental aged beached plastics using human cell lines.
Ecotoxicol Environ Saf
January 2025
Univ. Bordeaux, CNRS, Bordeaux INP, EPOC, UMR 5805, Pessac F-33600, France. Electronic address:
Plastic products contain complex mixtures of chemical compounds that are incorporated into polymers to improve material properties. Besides the intentional chemical additives, other compounds including residual monomers and non-intentionnaly added substances (NIAS) as well as sorbed pollutants are usually also present in aged plastic. Since most of these substances are only loosely bound to the polymer via non-covalently interactions, i.
View Article and Find Full Text PDFNew Rat Model Mimicking Sacrocolpopexy for POP Treatment and Biomaterials Testing via Unilateral Presacral Suspension.
Int Urogynecol J
January 2025
Department of Obstetrics and Gynecology, First Affiliated Hospital of Dalian Medical University, 222 Zhongshan Road, Dalian, China.
Introduction And Hypothesis: Pelvic organ prolapse (POP) impacts women's health and quality of life. Post-surgery complications can be severe. This study uses rat models to replicate sacrocolpopexy and test materials for pelvic support, verifying the 4-week postoperative mortality rate, the mechanical properties of the mesh tissue, and the collagen content.
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!