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On-chip higher-order topological micromechanical metamaterials

Science Bulletin 2021年第19期66卷 1959-1966,M0003页

作者： Ying Wu Mou Yan Zhi-Kang Lin Hai-Xiao Wang Feng Li Jian-Hua Jiang School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510640China School of Physical Science and Technology&Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow UniversitySuzhou 215006China School of Physical Science and Technology Guangxi Normal UniversityGuilin 541004China Key Lab of Advanced Optoelectronic Quantum Architecture and Measurement(MOE)and School of Physics Beijing Institute of TechnologyBeijing 100081China Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province&Key Lab of Modern Optical Technologies of Education Ministry of China Soochow UniversitySuzhou 215006China

Metamaterials with higher-order topological band gaps that exhibit topological physics beyond the bulkedge correspondence provide unique application values due to their ability of integrating topological boundary states at multiple dimensions in a single *** the other hand,in the past decade,micromechanical metamaterials are developing rapidly for various applications such as micro-piezoelectricgenerators,intelligent micro-systems,on-chip sensing and self-powered *** empower these cutting-edge applications with topological manipulations of elastic waves,higher-order topological mechanical systems working at high frequencies(MHz)with high quality-factors are *** current realizations of higher-order topological mechanical systems,however,are still limited to systems with large scales(centimetres)and low frequencies(k Hz).Here,we report the first experimental realization of an on-chip micromechanical metamaterial as the higher-order topological insulator for elastic waves at *** higher-order topological phononic band gap is induced by the band inversion at the Brillouin zone corner which is achieved by configuring the orientations of the elliptic pillars etched on the silicon *** consistent experiments,theory and simulations,we demonstrate the emergence of coexisting topological edge and corner states in a single silicon chip as induced by the higher-order band *** experimental realization of on-chip micromechanical metamaterials with higherorder topology opens a new regime for materials and applications based on topological elastic waves.

关键词： Higher-order band topology Micromechanical metamaterials On-chip devices mechanical waves

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Effect of Microfocused Ultrasound on Facial Rejuvenation: Clinical and Histological Evaluation

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Journal of Biosciences and Medicines 2021年第7期9卷 112-125页

作者： Patricia Froes Meyer Michelle Meleck Fabio dos Santos Borges Esteban Fortuny Stephany Luanna Queiroga Farias Felipe Alexander Caldas Afonso Ciro Dantas Soares Eneida de Morais Carreiro Rodrigo Marcel Valentim da Silva André Luiz Miranda Barbosa Federal University of Rio Grande do Norte (UFRN) Natal Brazil University Centre of Rio Grande do Norte (UNI-RN) Natal Brazil Michelle Meleck Advanced Aesthetics S&atilde o Paulo Brazil Estácio de Sá University Rio de Janeiro Brazil Universidad Finis Terrae Santiago Chile Potiguar University (UNP) Natal Brazil Campinas State University (UNICAMP) Campinas Brazil Fellow da West Virginia University Morgantown USA

Introduction: Micro focused ultrasound (MFU) is formed by mechanical waves emitted in a focused manner, concentrating thermal energy on a certain point or region, promoting a clinical improvement in wrinkles. Objective: evaluate the effects of micro focused ultrasound on facial rejuvenation. Methodology: This is an experimental study. The sample consisted of 30 volunteers, who were evaluated before treatment, 45 and 90 days after its beginning. A single application of the MFU was performed across the facial region. The parameters used were: 10 MHz cartridge with depth of 1.5 mm, 7 MHz with depth of 3 mm, and 4 MHz with focal depth of 4.5 mm;doses ranged from 0.1 to 2.0 J, according to the sensitivity of the volunteers treated, and the application time was of approximately 90 minutes. Clinical photographic analysis and facial symmetry analysis using Dolphin Imaging software were performed, and validated questionnaires. Two volunteers were submitted to blepharoplasty surgery, and one to rhytidoplasty surgery 45 days after the application of the MFU. Samples of the treated skin were taken after the surgical procedures and submitted to histological and immunohistochemical analyses. The volunteers answered a questionnaire to assess adverse reactions and satisfaction. Results: We observed a visible clinical improvement on the images by photography, and an improvement of facial symmetry in the measurements of the paralateronasal projection (p = 0.007), left lateral mandibular (p = 0.01), and right lateral mandibular (p = 0.008). The histological analysis showed an increase in the amount of fibroblasts (p = 0.02), blood vessels (p = 0.0062) and inflammatory cells (p = 0.0036), in addition to the production of type 1 collagen. In the immunohistochemical analysis, we observed the presence of the macrophage marker IHQ: CD68, indicating phagocytosis of adipose tissue and the presence of fibrosis. In the analysis of adverse reactions, only transient hyperemia was observed with t

关键词： Skin Aging mechanical waves Sagging Wrinkles

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