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Studying thin film damping in a micro-beam resonator based on non-classical theories 被引量:3
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作者 Mina Ghanbari Siamak Hossainpour Ghader Rezazadeh 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2016年第3期369-379,共11页
In this paper, a mathematical model is presented for studying thin film damping of the surrounding fluid in an in-plane oscillating micro-beam resonator. The proposed model for this study is made up of a clamped-clamp... In this paper, a mathematical model is presented for studying thin film damping of the surrounding fluid in an in-plane oscillating micro-beam resonator. The proposed model for this study is made up of a clamped-clamped micro-beam bound between two fixed layers. The microgap between the micro-beam and fixed layers is filled with air. As classical theories are not properly capable of predicting the size dependence behaviors of the micro-beam,and also behavior of micro-scale fluid media, hence in the presented model, equation of motion governing longitudinal displacement of the micro-beam has been extracted based on non-local elasticity theory. Furthermore, the fluid field has been modeled based on micro-polar theory. These coupled equations have been simplified using Newton-Laplace and continuity equations. After transforming to non-dimensional form and linearizing, the equations have been discretized and solved simultaneously using a Galerkin-based reduced order model. Considering slip boundary conditions and applying a complex frequency approach, the equivalent damping ratio and quality factor of the micro-beam resonator have been obtained. The obtained values for the quality factor have been compared to those based on classical theories. We have shown that applying non-classical theories underestimate the values of the quality factor obtained based on classical theo-ries. The effects of geometrical parameters of the micro-beam and micro-scale fluid field on the quality factor of the resonator have also been investigated. 展开更多
关键词 Thin film damping micro-electromechanical systems(MEMS) Micro-polar theory
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Emission of Biophotons Is a Cosmic Effect
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作者 Siva Prasad Kodukula 《Open Journal of Biophysics》 2016年第2期34-37,共4页
Relation between emission of biophotons and the “space-time” of the universe has been conceptualized and the concerned calculation is verified with the experimental results. The theoretical result derived is at par ... Relation between emission of biophotons and the “space-time” of the universe has been conceptualized and the concerned calculation is verified with the experimental results. The theoretical result derived is at par with the experimental results on biophotons. Some concepts like “Film Theory of the Universe”, K-Suryon, “Super Theory of Relativity” and “Siva’s constant ‘K’’’ have been utilized in the calculations. These calculations emphasized that the experimental results on biophotons are an effect of cosmic interactions. It is a new dimension of research on biophotons and may lead to new path for experimental verification in the areas of consciousness and neurosciences. 展开更多
关键词 film theory of Universe K-Suryon Siva’s Constant BIOPHOTON CONSCIOUSNESS
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Mechanism of Quantum Consciousness that Synchronizes Quantum Mechanics with Relativity—Perspective of a New Model of Consciousness
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作者 Siva Prasad Kodukula 《Journal of Modern Physics》 2021年第12期1633-1655,共23页
Synchronization of quantum mechanics with relativity has been considered differently from the present quantum gravity models. It is originated from the roots of philosophy of physics and the basic concepts of relativi... Synchronization of quantum mechanics with relativity has been considered differently from the present quantum gravity models. It is originated from the roots of philosophy of physics and the basic concepts of relativity & quantum mechanics. It emphasizes the fact that two conscious observers are necessary to experience one conscious moment. Various concepts of consciousness have been discussed and emphasized the necessity for the introduction of a new model of quantum consciousness. A quantum coordinate system has been introduced to explain the present understanding of the phenomena “observation” and “reality”. It has been elaborated that the observation defined by physics is confined to Lorentz space time coordinate system, Minkowski coordinate system and general relativity. But phenomena of observation cannot be completed without considering one more hidden transformation explaining quantum coordinate system which transforms the quantum states into relativistic coordinate system as an interaction between two conscious observers explained by an interactive mechanism of quantum states. A flow chart has been illustrated by a mechanism giving rise to conscious moment and proposed a new model of consciousness. It emphasizes on the fact that “reality” is different from “observation” defined by physics. It affects the relativistic factor of special relativity and suggests a modification for it. If this modified relativistic factor is proved experimentally, the results establish consciousness’s mechanism and a remarkable breakthrough in physics of consciousness studies. 展开更多
关键词 Quantum Mechanics RELATIVITY Double Relativity Effect film theory of Universe CONSCIOUSNESS
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Thermoacoustic theory of graphene films considering heat transfer of substrate materials
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作者 BIAN Anhua LI Shuang +3 位作者 XING Qianhe HUANG Xu FAN Xueliang LI Cheng 《Chinese Journal of Acoustics》 CSCD 2018年第2期191-201,共11页
Based on thermoacoustic theory, a coupled thermal-mechanical model for graphene films is established, and the analytical solutions for thermal-acoustic radiation from a graphene thin film are obtained. The sound press... Based on thermoacoustic theory, a coupled thermal-mechanical model for graphene films is established, and the analytical solutions for thermal-acoustic radiation from a graphene thin film are obtained. The sound pressure of the graphene film generator on different substrates is measured, and the measurement data is compared with the theoretical results. The frequency response from the experimental results is consistent with the theoretical ones, while the measured values are slightly lower than the theoretical ones. Therefore, the accuracy of the proposed theoretical model is verified. It is shown that thermal-acoustic radiation from a graphene thin film reveals a wide frequency response. The sound pressure level increases with the frequency in the low frequency range, while the sound pressure varies smoothly with frequency in the high frequency range. Thus it can be used as excellent thermal generator. When the thermal effusivity of the substrate is smaller, then the sound pressure of grapheme films will be higher. Furthermore, the sound pressure decreases with the increase of heat capacity per unit area of grapheme films. Results will contribute to the mechanism of graphene films generator and its applications in the design of loudspeaker and other related areas. 展开更多
关键词 Thermoacoustic theory of graphene films considering heat transfer of substrate materials
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