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The linear metallic particles which are static lying on the GIS enclosure have less harmful to the insulating property. However, the insulating property will reduce in a large degree when the metallic particles once stand and beat in the GIS cavity. Many papers have discussed the behavior of linear particle in the GIS affected by the type and shape of the particles, the pressure of the gas insulation,...
The transformer oil-based nanofluids have significant improvements in their thermal conductivity and dielectric strength than traditional transformer oil, so they have a wide prospect of application. In order to explore the mechanism of the thermal dissipation enhancement of transformer oil-based nanofluids, the flow field distribution of them under the DC voltage were measured by particle image velocimetry...
This paper focuses on the design and analysis of RF MEMS metal contact switch with a π shaped cantilever beam operating in the frequency range from 4 to 12 GHz. The topology of the design is a modified cantilever beam to achieve a low pull-in voltage. The design was analyzed as a metal contact switch to ensure its operation from DC onwards. The design is modified in terms of thickness of the beam,...
The Dielectrophoresis (DEP) is a phenomenon in which a force exists on a particle due to a non-uniform electric field. A DEP levitation is widely used technique for particle trapping and levitation, where it is used mainly with biological particles. In this work, a 3D and 2D model of quadrupole levitation system of printed circuit board (PCB) based technology is presented and discussed. The levitation...
This paper presents a flexible, three-axis, rapidly prototyped capacitive touch sensor that utilizes a patterned elastomeric dielectric layer. The sensor was fabricated from a copper clad kapton laminate and is capable of resolving normal pressure and tracking directional motion. In a mock clinical breast examination (CBE) setup, we used a breast model to demonstrate that the sensor, when placed under...
The article describes the main approaches to the use of modular training systems intended for NSTU students laboratory works in physics. Applying these systems is assumed in educating of schoolchildren to project research activity. Examples of laboratory equipment application during physical experiments performed by students of specialized classes are demonstrated.
In recent years, there has been a significant increase in the damage to electrical and electronic devices owing to lightning surge-induced overvoltage/overcurrent, in Japan. In particular, the lightning surge overcurrent that flows through grounding lines can cause serious damage to electronic equipment. To understand the phenomenon of the lightning surge current propagation in the ground poles, it...
In this paper, we designed and simulated a multilayer planar resonator with target frequency of 2.5 MHz which is created over a row/column-addressed 2D CMUT array. We have shown through finite element modeling and simulations that a particle can be trapped and manipulated both in lateral and axial directions inside the fluid channel by activating CMUT elements; And calculated acoustic radiation force...
Capacitive Micromachined Ultrasonic Transducer (CMUT) is a new type of ultrasound wave generator and detector. Analytical method is intuitive to understand the mechanism and physical effects through modeling of CMUT. To optimize the design procedures of CMUT membrane undergoing large deflection, a new analytical model with the consideration of the lateral force using Von Kármán equations is proposed...
Radio Frequency (RF) Microelectromechanical system (MEMS) switches are becoming more and more popular in the electronics industry. The main concern in using RF MEMS switch is its high actuation voltage. Thus the main focus in this paper is to obtain low actuation voltage. This paper presents the simulation and analysis of RF MEMS cantilever beam and Fixed – Fixed beam switches. RF MEMS switches simulated...
With the superiority of compactness, high reliability and the great transmission capacity, gas-insulated lines (GIL) has been widely used especially in certain regions. However, free metal particles may be brought into the closed structure inevitably. To study the problem of metal-particles pollution in AC GIL, the electromechanics of one spherical metal particle is analysed in a pragmatic situation...
A method of assembling a multi-walled carbon-nanotube field effect transistor (CNT-FET) was presented in this paper. A nanorobotic manipulation system with 11 positioning degrees of freedom (DOFs) was used for the real time nanomanipulation. The nanorobotic manipulation system was constructed inside the scanning electron microscopy (SEM) specimen chamber to pick up a single MWCNT from MWCNT bulk without...
In this study we have tested the hypothesis regarding the increase in synchronization with the onset of muscle fatigue. For this aim, we have investigated the difference in the synchronicity between high density surface electromyogram (sEMG) channels of the rested muscles and when at the limit of endurance. Synchronization was measured by computing and normalizing the mutual information between the...
Objective. The work presented here describes a new tool for peripheral nerve interfacing, called the microneedle cuff (μN-cuff) electrode. Approach. μN arrays are designed and integrated into cuff electrodes for penetrating superficial tissues while remaining non-invasive to delicate axonal tracts. Main results. In acute testing, the presence of 75 μm height μNs decreased the electrode-tissue interface...
Limitations of many Brain Machine Interface (BMI) systems using invasive electrodes include reliance on single neurons and decoding limited to kinematics only. This study investigates whether force-related information is present in the local field potential (LFP) recorded with deep brain electrodes using data from 14 patients with Parkinson's disease. A classifier based on logistic regression (LR)...
Neural correlates of movement planning onset and direction may be present in human electrocorticography in the signal dynamics of both motor and non-motor cortical regions. We use a three-stage model of jPCA reduced-rank hidden Markov model (jPCA-RR-HMM), regularized shrunken-centroid discriminant analysis (RDA), and LASSO regression to extract direction-sensitive planning information and movement...
To generate voluntary forearm movements, the information that is encoded in the activity of the cortical neurons has to travel through the spinal cord and activate the skeletal muscles. The axons carrying these signals are tightly bundled together in the descending tracts that control the spinal circuitry innervating the forearm muscles. In this paper, we show that corticospinal tract (CST) signals...
For neural probes to be used chronically for years in the human body, they must provoke minimal scarring. Recently, a number of groups have reported substantially reduced scar tissue using cellular scale electrodes below 15 μm in size. This size scale is accessible to manufacturing techniques, but can be very difficult to insert in the brain for most common electrode materials. In this study, we explore...
Simple in-shoe sensors based on film-type sensor materials were developed in this study. Three sensor materials were tested: polyvinylidenefluoride (PVDF), cellulose nanofibrils (CNF) and ElectroMechanical Film (EMFi). Plantar pressure distributions of a subject were measured with the developed in-shoe sensors; each consisting of three sensor channels (lateral and medial metatarsal heads and heel)...
Hemispheric stroke survivors tend to have persistent motor impairments, with muscle weakness and muscle spasticity observed concurrently in the affected muscles. The objective of this preliminary study was to identify whether impairment of muscle force transmission could contribute to weakness in spastic-paretic muscles of chronic stroke survivors. To characterize the efficiency of the transmission...
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