Current Issue : January - March Volume : 2017 Issue Number : 1 Articles : 6 Articles
A hollow fiber temperature sensor filled with graphene-Ag composite nanowire and liquid\nis presented and numerically characterized. The coupling properties and sensing performances\nare analyzed by finite element method (FEM) using both wavelength and amplitude interrogations.\nDue to the asymmetrical surface plasmon resonance sensing (SPR) region, the designed sensor exhibits\nstrong birefringence, supporting two separate resonance peaks in orthogonal polarizations. Results\nshow that x-polarized resonance peak can provide much better signal to noise ratio (SNR), wavelength\nand amplitude sensitivities than y-polarized, which is more suitable for tempertature detecting.\nThe graphene-Ag composite nanowire filled into the hollow fiber core can not only solve the oxidation\nproblem but also avoid the metal coating. A wide temperature range from 22 ââ??¦C to 47 ââ??¦C with steps\nof 5 ââ??¦C is calculated and the temperature sensitivities we obtained are 9.44 nm/ââ??¦C for x-polarized\nand 5.33 nm/ââ??¦C for y-polarized, much higher than other sensors of the same type....
Silicon nanowires fabricated by metal-assisted chemical etching can present low porosity and a rough surface\ndepending on the doping level of the original silicon wafer. In this case, wiring of silicon nanowires may represent\na challenging task. We investigated two different approaches to realize the electrical contacts in order to enable\nelectrical measurement on a rough silicon nanowire device: we compared FIB-assisted platinum deposition for the\nfabrication of electrical contact with EBL technique....
This paper reports a miniaturized piezoelectric accelerometer suitable for a small haptic\nactuator array. The accelerometer is made with zinc oxide (ZnO) nanowire (NW) grown on a copper\nwafer by a hydrothermal process. The size of the accelerometer is 1.5 Ã?â?? 1.5 mm2, thus fitting\nthe 1.8 Ã?â?? 1.8 mm2 haptic actuator array cell. The detailed fabrication process of the miniaturized\naccelerometer is illustrated. Performance evaluation of the fabricated accelerometer is conducted by\ncomparing it with a commercial piezoelectric accelerometer. The output current of the fabricated\naccelerometer increases linearly with the acceleration. The miniaturized ZnO NW accelerometer is\nfeasible for acceleration measurement of small and lightweight devices....
Since a photon carries both energy and momentum, when it interacts with a particle,\nphoton-particle energy and momentum transfer occur, resulting in mechanical forces acting on the\nparticle. In this paper we report our theoretical study on the use of a laser beam to manipulate\nand control the flow of nanofluids in a micro-channel. We calculate the velocity induced by a laser\nbeam for TiO2, Fe2O3, Al2O3 MgO, and SiO2 nanoparticles with water as the base fluid. The particle\ndiameter is 50 nm and the laser beam is a 4 W continuous beam of 6 mm diameter and 532 nm\nwavelength. The results indicate that, as the particle moves, a significant volume of the surrounding\nwater (up to about 8 particle diameters away from the particle surface) is disturbed and dragged\nalong with the moving particle. The results also show the effect of the particle refractive index on the\nparticle velocity and the induced volume flow rate. The velocity and the volume flowrate induced by\nthe TiO2 nanoparticle (refractive index n = 2.82) are about 0.552 mm/s and 9.86 fL, respectively, while\nthose induced by SiO2 (n = 1.46) are only about 7.569 �¼m/s and 0.135, respectively....
The aim of this study is to investigate the capability of a 6-DoF parallel robot to perform various rehabilitation exercises. The foot\ntrajectories of twenty healthy participants have been measured by a Vicon system during the performing of four different exercises.\nBased on the kinematics and dynamics of a parallel robot, a MATLAB programwas developed in order to calculate the length of the\nactuators, the actuators� forces, workspace, and singularity locus of the robot during the performing of the exercises. The calculated\nlength of the actuators and the actuators� forces were used by motion analysis in SolidWorks in order to simulate different foot\ntrajectories by the CAD model of the robot. A physical parallel robot prototype was built in order to simulate and execute the foot\ntrajectories of the participants. Kinect camera was used to track the motion of the leg�s model placed on the robot. The results\ndemonstrate the robot�s capability to perform a full range of various rehabilitation exercises....
A numerical analysis is performed to investigate the laminar, free convection flow in\nan Open Enclosure Using Lattice Boltzmann Method (LBM) in the presence of Carbon\nnanotube and Cu nanoparticles. The problem is studied for different volume\nfractions of nanoparticles, and aspect ratio of the cavity for various Ray ligh numbers.\nThe volume fraction of added nanoparticles to water (as base fluid) is lower than 1%\nto make dilute suspensions. The study presents a numerical treatment based on LBM\nto model convection heat transfer of Carbon nanotube based nanofluids. Results\nshow that adding a low value of Carbon nanotube to the base fluid led to significant\nenhancement of convection rate. Results show that adding nanoparticles to the base\nfluid enhances the rate of natural convection in a cavity. Make a comparison between\nCarbon nanotube and Cu-nanoparticles shows that the Carbon nanotube-nanoparticle\nhas better performance to enhance convection rate at comparison with Cunanoparticles....
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