Results 51 to 60 of about 1,829,402 (284)

Bifurcation Control of an Electrostatically-Actuated MEMS Actuator with Time-Delay Feedback

Micromachines, 2016
The parametric excitation system consisting of a flexible beam and shuttle mass widely exists in microelectromechanical systems (MEMS), which can exhibit rich nonlinear dynamic behaviors.
Lei Li, Qichang Zhang, Wei Wang, Jianxin Han   +3 more
doaj   +1 more source

Lone‐Pair‐Induced Lattice Distortion in Lead‐Free Hybrid Perovskites for High‐Performance Nanogenerators

Advanced Functional Materials, EarlyView.
A lead‐free tin‐based hybrid perovskite is designed in which stereochemically active lone‐pair electrons on tin distort the crystal lattice and break its symmetry. Blended into a flexible polymer, the material converts pressure into electricity at milliwatt‐scale power density and continues working far below freezing, powering a commercial wristwatch ...
Majid Haji Bagheri, Asif Abdullah Khan, Md Fahim Al Fattah, Mahmoud Almadhoun, Shamaila Shahzadi, Aixi Pan, Md Soyaeb Hasan, Henry Wu, Arash Aghigh, Bhawna Bhawna, François Légaré, Vivek Maheshwari, Dayan Ban   +12 more
wiley   +1 more source

Nonlinear Vibration of Temperature-Dependent FGM Beams with Symmetric and Asymmetric Boundary Conditions via the Generalized Differential Quadrature Method

Computation
Functionally graded (FG) materials can deliver greater mechanical performance compared to pure isotropic and composite materials. Temperature has a significant effect on structural performance, as it can substantially reduce the stiffness parameter and ...
Malik K. Altaee, Azhar G. Hamad, Thamer H. Alhussein, Yousef S. Al Rjoub, Nasser Firouzi, Przemysław Podulka   +5 more
doaj   +1 more source

Nonlinear Vibration Mechanism of the Marine Rotating Machinery with Airbag Isolation Device under Heaving Motion

Shock and Vibration, 2021
In this paper, we put an investigation into the nonlinear vibration mechanism of the marine rotating machinery with an airbag isolation device under heaving motion.
Xiaolei Du, Ming Li
doaj   +1 more source

Defect‐Mediated Inelastic Light Scattering by Infrared Phonons in Hexagonal Boron Nitride

Advanced Functional Materials, EarlyView.
Optically active defects in hexagonal boron nitride enable inelastic stimulated light scattering mediated by infrared‐active phonons, relaxing conventional Raman selection rules. Defect engineering enhances the Stokes‐conversion process and activates both TO‐ and LO‐phonon scattering channels.
Prabhdeep Singh, Bharti Garg, Maximilian Black, Masoud Taleb, Nahid Talebi   +4 more
wiley   +1 more source

Influence of tooth profile errors and subharmonic resonance in helical gears rattle

Nihon Kikai Gakkai ronbunshu, 2015
This paper deals with the gear rattle of helical gear system. Introducing the mesh stiffness and torque variation into the one pair of helical gear system, the effects of the shapes of the tooth profile errors on the rattle are studied, and the ...
Yutaka YOSHITAKE, Toshiyuki KOGA, Natsumi TAGAWA, Shintaro SOBU, Takahiro HARANO, Yasuhiko OUGIYA   +5 more
doaj   +1 more source

Neuromorphic Devices for Extreme Environments: State‐Variable Reliability and Stabilization Strategies

Advanced Functional Materials, EarlyView.
Neuromorphic devices for extreme environments are interpreted through the physical states that store and process information. Radiation, temperature extremes, and vacuum can perturb vacancies, filaments, trapped charges, polarization, interfaces, and readout signals.
Taehyun Park, Geon Park, Junhyung Cho, Jaechan Song, Wangmyung Choi, Jaehyun Hur, Nicola Gasparini, Hocheon Yoo   +7 more
wiley   +1 more source

Optimum Design of a Nonlinear Vibration Absorber Coupled to a Resonant Oscillator: A Case Study

Shock and Vibration, 2018
This paper presents the optimal design of a passive autoparametric cantilever beam vibration absorber for a linear mass-spring-damper system subject to harmonic external force.
H. F. Abundis-Fong, J. Enríquez-Zárate, A. Cabrera-Amado, G. Silva-Navarro   +3 more
doaj   +1 more source

Internal Resonance Mismatch-Controlled Dissipative Bistability Collapse in Coupled Micromechanical Oscillators. [PDF]

Adv Sci (Weinh)
This paper reveals internal resonance mismatch‐controlled dissipative bistability collapse in a coupled micromechanical resonator. Tuning δIR changes both internal‐mode amplitude and phase‐dependent feedback. For negative mismatch, Duffing bistability survives.
Chen J, Zhou X, Tsukamoto T, Wang N, Tanaka S.   +4 more
europepmc   +2 more sources

Emergence of a Hexagonal Fe2S2 Single Layer Without a Bulk Counterpart via Phase Transformation

Advanced Functional Materials, EarlyView.
Upon annealing, single‐layer Mackinawite iron sulfide transforms into a previously unknown hexagonal Fe2S2${\rm Fe}_2{\rm S}_2$ phase with β$\beta$‐CuI structure. STM, LEED, and first‐principles calculations identify the structure and show that electronic correlations and magnetic order are important for its stability.
Affan Safeer, Wejdan Beida, Felix Oberbauer, Nicolae Atodiresei, Gustav Bihlmayer, Max Wolfertz, Chiara Schlichte, Wouter Jolie, Stefan Blügel, Jeison Fischer, Thomas Michely   +10 more
wiley   +1 more source