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In this study, we focus on the alteration of negative dielectrophoresis (n-DEP) caused by small amount of DNA labeling on the microbeads and propose a new design of microfluidic device for more sensitive DNA detection. In previous study, we proposed a new electrical technique for rapid detection of DNA amplified by polymerase chain reaction (PCR). The method is based on dramatic alteration of dielectrophoresis...
An inherent variable stiffness approach was proposed to suppress the rebound and impact of the electrostatic switch due to waveform deviations. A simple clamped-guided beam spring with large deflection, which generated inherent cubic nonlinear restoring force, was adopted for implementation of the approach. The initial stiffness is very small but increases significantly with the displacement. In this...
In this paper, the effect of the acting electrode position on the dynamic behavior of a polysilicon microcantilever is investigated by considering different oscillating modes. The oscillation of structures in higher bending modes is used to increase the quality factor and to decrease the loss of energy during oscillation. The tests are performed in ambient conditions as well as in vacuum. The position...
The need of designing tactile sensors for machines and robotic systems has become crucial with the increase of the tasks related to human. This work proposes a silicone embedded, low profile piezoelectric sensor array that is suitable for applications where tactile sensing and force localization is needed. The developed sensor has 3 piezoelectric ceramics (PZT) placed in 1×3 array and consists of...
This paper presents an analysis of effect of external load on hemispherical resonator gyroscope (HRG) feedback control system with state constraint. Firstly, the analytical solution of dynamic equation under multi-electrode excitation is obtained based on dynamic equations of resonator in the second-order resonant state. Through analysis, two main reasons that external load influences feedback control...
Corona discharge due to a conductive particle in highvoltage system is analyzed using a coupled equation, which consists of Poisson's equation for electric field distribution and a discharge equation for space charge density variation. The charge of a conductive particle is calculated using the finite element method, and the electric force acing on the particle is obtained using the calculated result...
This paper presents a new multi-muscle force estimation approach based on a HD-sEMG/force model in experimental context. Accordingly, we will try to estimate the muscle force of the three elbow flexors: Biceps Brachii (BB), Brachialis (BR) and Brachioradialis (BRD) in isometric isotonic conditions. This will be done by using a recently proposed sEMG/force equation model validated by simulation. For...
Myoelectric control with surface EMG signal has achieved great success in clinics, but only limited to the control of 2-Degrees-of-freedom prosthesis. With the appearance of multiple-channel and high-density EMG system and the advances of pattern recognition technology, it becomes possible to control a multi-degree smart prosthesis using EMG signals. However, it requires high performance EMG systems...
We developed a label-free biosensor based on light scattering from polystyrene beads and dielectrophoresis spectroscopy that can identify single stranded DNA. We have demonstrated this method using DNA strands with 16, 17, and 26 base pairs of nucleotides.
Sensitivity is an important index of the performance of micro-machined gyroscope, and enhancing sensitivity is an effective way to improve the performance of gyroscope. In this paper, a new type of vibration structure to enhance the sensitivity of butterfly micro-machined gyroscope was proposed. By using dry etching processing, the vibration structure can obtain a rectangle vibration beam rather than...
This paper describes the development of a proof of principle of a flexible force sensor and the corresponding readout circuit. The flexible force sensor consists of a parallel plate capacitor that is 3D printed using regular and conductive thermoplastic poly-urethane (TPU). The capacitance change due to an applied sinusoidal force is measured using an LCR meter. A proof of principle, using an oscillatory...
Electrostatic adhesion force is studied and analysed with emphasis on design parameters of the interdigital electrodes, material properties of dielectric layers and its thickness. From these results two fabrication processes of the electroadhesive foils are studied to reach the highest possible performance. Experimental measurements are carried out to verify the results.
It was shown experimentally in [1] that a macroscopic cylindrical solid can be rotated due to the excitation of two counter-propagating surface acoustic waves (SAWs) with different amplitudes on its surface. The arising distributed rotation force has been estimated phenomenologically in the partial case of a piezoelectric tube with a ring unidirectional electrode transducer (RUDT) using the torsion...
It was shown experimentally in [1], [2] that a macroscopic cylindrical solid can be rotated due to the excitation of two counter-propagating surface acoustic waves (SAWs) with different amplitudes on its surface. Arising internal distributed rotation force has been calculated phenomenologically in the partial case of a piezoelectric tube with a ring unidirectional electrode transducer (RUDT) using...
Phononic crystals have attracted intensive research interest for decades since the early 1990s. They exhibit a spatially periodic feature regarding the distribution of physical properties, geometry, boundary conditions, or/and external stimuli, making their wave spectrum quite different from the conventional continuous one, usually with frequency band gaps where waves cannot propagate through them...
A mathematical model of electrically charged plastic particles movement in the free-fall electrostatic separator is discussed based on the theoretical analysis and experimental observation. The formulated model considers both field-to-particle and also particle-to-particle interactions and takes into account stochastic characteristics of the model parameters. Simulation of particle motion, therefore,...
To better characterize movement-related neurophysiological change, the authors propose to measure not only neural activity through the electroencephalogram (EEG) but also cerebral blood flow (CBF) using a new technology, near-infrared diffuse correlation spectroscopy (DCS). A preliminary trial is described, in which EEG, DCS, and exerted force were simultaneously recorded during a cue-triggered hand...
This document presents the mathematical model of a microfluidic device employing dielectrophoresis for purposes of 3D-focusing. The electrode configuration consists of multiple interdigitated transducer electrodes on either side of the bottom surface of the microchannel. The model consists of three equations of motion, one for each direction, equation of electric potential and electric field, and...
In this paper we present the use of a dielectrophoresis (DEP) cytometry technique to study changes in single cells upon application of a particular stimulus. In one case we measure single CHO cells immediately after exposure to pulsed electric fields. Our results show a significant change in the dielectric response of cells after application of sufficiently strong pulses. In another study we investigate...
This work presents a Lamé mode resonator featuring a novel gap closing mechanism which employs electrostatic force to reduce the capacitive transduction gaps to sub-micron values to overcome fabrication technology limitations. This leads to significant resonator loss and motional resistance reduction, which is highly advantageous as it simplifies the design of oscillation sustaining circuitry. Prototypes...
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