Search results for: Junshi Zhang

Items from 1 to 12 out of 12 results

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Long non‐coding RNA NORAD functions as a microRNA‐204‐5p sponge to repress the progression of Parkinson's disease in vitro by increasing the solute carrier family 5 member 3 expression

Shufang Zhou, Dan Zhang, Junnan Guo, Zhenzhen Chen, more

IUBMB Life > 72 > 9 > 2045 - 2055

Parkinson's disease (PD) is one of the most common neurodegenerative disorders. Long non‐coding RNAs have important regulatory values in various human diseases. Non‐coding RNA Activated by DNA Damage (NORAD) was reported to regulate PD progression in vitro, but its functional mechanism is fully unknown. We used 1‐methyl‐4‐phenylpyridinium (MPP⁺) to establish the cell‐based PD model. NORAD, microRNA‐204‐5p...

article

Pinnacle elimination and stability analyses in nonlinear oscillation of soft dielectric elastomer slide actuators

Junshi Zhang, Hualing Chen, Dichen Li

Nonlinear Dynamics > 2018 > 94 > 3 > 1907-1920

Dielectric elastomers (DEs) exhibit significant potential applications as soft robots. Due to complicated electromechanical coupling behavior, DEs generate a strong nonlinear oscillation, which may induce the undesired failure and other instabilities. Based on the DE slide actuators (DESAs), we deduce a viscoelastic dynamic model by incorporating the inertial forces and viscous dampings in all three...

article

Experimental investigation on electromechanical deformation of dielectric elastomers under different temperatures

Lei Liu, Hualing Chen, Bo Li, Junjie Sheng, more

Theoretical and Applied Mechanics Letters > 2015 > 5 > 4 > 155-159

Under an applied voltage, dielectric elastomers (DEs) produce an actuation strain that is nonlinear, partly because of the material properties. In this study, an experimental characterization is conducted to evaluate how the ambient temperature and pre-stretch affected the actuation performance. For DEs with a pre-stretch of 2×2, an increase of temperature from −10°to 80°results in a variation in...

article

Modelling of spring roll actuators based on viscoelastic dielectric elastomers

Junshi Zhang, Hualing Chen, Liling Tang, Bo Li, more

Applied Physics A > 2015 > 119 > 3 > 825-835

In this article, the effect of viscoelastic deformation is analyzed theoretically to evaluate the performance of spring roll dielectric elastomer (DE) actuators. By patterning the electrodes on the rolls, respectively, two functions are studied: axial elongation and bending. The thermodynamic model of viscoelastic DE spring roll is established, and the governing equation is deduced by the free energy...

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Dynamic performance of dissipative dielectric elastomers under alternating mechanical load

Junshi Zhang, Hualing Chen, Junjie Sheng, Lei Liu, more

Applied Physics A > 2014 > 116 > 1 > 59-67

This paper presents a theoretical study about the effect of dissipation on the dynamic performance of a dielectric elastomer membrane subject to a combination of mechanical load and voltage. The thermodynamic dissipative model is given and the equation of motion is deduced by a free energy method. It is found that when the applied mechanical load and voltage are static, the membrane may reach a state...

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Temperature effects on the dynamic response of viscoelastic dielectric elastomer

Junjie Sheng, Hualing Chen, Lei Liu, Junshi Zhang, more

Theoretical and Applied Mechanics Letters > 2013 > 3 > 5

Viscoelasticity and temperature can significantly affect the performance of a dielectric elastomer. In the current study, we use a thermodynamic model to describe the effect of temperature and viscoelasticity on the electromechanical response undergoing a cyclic electric load by taking into account of the temperature dependent dielectric constant. Because of the significant viscoelasticity in the...

article

Constitutive relation of viscoelastic dielectric elastomer

Junshi Zhang, Hualing Chen, Junjie Sheng, Lei Liu, more

Theoretical and Applied Mechanics Letters > 2013 > 3 > 5

In this paper, we present a modified model describing the constitutive relation of viscoelastic dielectric elastomer (DE). The uniform uniaxial tension-recovery experiment was carried out at different stretching rates. Based on Yeoh hyper-elastic model, model-fitting approach is put forward to obtain the relationship between parameters of Yeoh model and stretching rate, thus the modified model was...