The restrictions on the coefficients describing physical effects depend on the orientation of the symmetry elements of the crystal or quasicrystal with respect to the Cartesian coordinate system employed. They are given for the piezoelectric effect of second order in stress or strain for all the orientations that can be expressed by the sequence of elements in the Hermann-Mauguin symbol of the point group. In the literature, the restrictions are usually given only for a particular orientation, which sometimes is not specified.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1107/S0108767307044455 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Slide-Ring Structured Stress-Electric Coupling Hydrogel Microspheres for Low-Loss Transduction Between Tissues.
Adv Mater
January 2025
Department of Orthopaedics Shanghai Key Laboratory for Prevention and Treatment of Bone and Joint Diseases, Shanghai Institute of Traumatology and Orthopaedics, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, 197 Ruijin 2nd Road, Shanghai, 200025, P. R. China.
High transductive loss at tissue injury sites impedes repair. The high dissipation characteristics in the electromechanical conversion of piezoelectric biomaterials pose a challenge. Therefore, supramolecular engineering and microfluidic technology is utilized to introduce slide-ring polyrotaxane and conductive polypyrrole to construct stress-electric coupling hydrogel microspheres.
View Article and Find Full Text PDFAn "Outer Piezoelectric and Inner Epigenetic" Logic-Gated PANoptosis for Osteosarcoma Sono-Immunotherapy and Bone Regeneration.
Adv Mater
December 2024
Materdicine Lab, School of Life Sciences, Shanghai University, Shanghai, 200444, P. R. China.
The precise manipulation of PANoptosis, a newly defined cell death pathway encompassing pyroptosis, apoptosis, and necroptosis, is highly desired to achieve safer cancer immunotherapy with tumor-specific inflammatory responses and minimal side effects. Nonetheless, this objective remains a formidable challenge. Herein, an "AND" logic-gated strategy for accurately localized PANoptosis activation, utilizing composite 3D-printed bioactive glasses scaffolds integrated with epigenetic regulator-loaded porous piezoelectric SrTiO nanoparticles is proposed.
View Article and Find Full Text PDFEffect of incomplete line defect size on energy localization and harvesting in phononic crystals.
J Acoust Soc Am
December 2024
School of Mathematics and Physics, Lanzhou Jiaotong University, Lanzhou, 730070, China.
The high electrical output performance of the phononic crystal (PnC)-based piezoelectric energy harvesting (PEH) system is of great research value in self-powered applications. This work presents the effect of incomplete line defect size on elastic wave energy localization and harvesting. The results show that for a given 7 × 5 supercell when the incomplete line defect reaches the second to sixth layer, the energy localization and harvesting performance show a changing trend of first increasing and then decreasing; when the incomplete line defect reaches the 4th, 5th, 3rd, 2nd, and 6th layers of the supercell, respectively, the performance of PEH systems shows a trend from large to small.
View Article and Find Full Text PDFFinite-time optimal control for MMCPS via a novel preassigned-time performance approach.
Neural Netw
February 2025
College of Control Science and Engineering, Bohai University, Jinzhou 121013, Liaoning, China. Electronic address:
Article Synopsis
- - This paper focuses on optimizing the stabilization of a macro-micro positioning stage (MMCPS) using a dynamic model rooted in Newton's second law, addressing the control of errors during positioning to ensure effective collaboration between its components.
- - The authors implement a reinforcement learning approach, utilizing actor-critic neural networks, to enhance controller performance while managing the forces exerted by voice coil motors (VCM) and piezoelectric actuators for vibration reduction.
- - A novel performance function is introduced to maintain the system's axis displacements within a predetermined range and time frame, proving the system's stability and showing successful simulation results that validate the proposed algorithm.
Enhancing Lower Third Molar Surgery: Using The Piezoelectric Technique for Superior Postoperative Outcomes and Complication Prevention.
Dent J (Basel)
November 2024
Department of Clinical and Experimental Medicine, University of Foggia, Via Rovelli, 50, 71122 Foggia, Italy.
The surgical removal of impacted mandibular third molars is routine in oral and maxillofacial surgery and common postoperative complications are widely reported in the literature. Therefore, this prospective split-mouth study aims to compare the postoperative sequelae of piezoelectric surgery versus conventional surgery of the lower third molar, focusing on pain and swelling. In total, 41 patients were treated under local anesthesia and surgical removal on one side of their mouth was performed using conventional rotary surgery (micromotor) while the other side's was by piezosurgery, with an interval of 15 days from the previous procedure (82 extraction sites); in addition, pain and swelling analyses were conducted.
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!