A multi-DOF ultrasonic motor developed in our previous study has significant potentials for dexterous actuation. The ultrasonic motor provides multiDOF rotation of a spherical rotor using three natural vibrations of a bar-shaped stator. In this paper, numerical analyses on the multi-DOF ultrasonic motor are conducted. First, a forward model of multi-DOF ultrasonic motor is developed considering...

A piezoelectric ultrasonic resonant micro-motor is developed with a stator diameter of 241 μm and an overall diameter of 400 μm. The motor is shown to produce a start-up torque of 1.2 nN m and a peak output power of 0.25 μW as designed, with a preload of 46.6 μN. An increase in preload to 2264 μN improved the performance to a start-up torque of 29 nN m and a peak output power of 9.1 μW. The mot...

Objective:The aim of this parallel controlled randomized clinical trial was to evaluate the clinical efficacy of ultrasonic subgingival debridement in combination with Er:YAG laser as compared to full mouth ultrasonic subgingival debridement alone, after one year, in patients with initial to moderate chronic periodontitis. Material & Methods: 40 patients diagnosed with mild to moderate periodon...

ompetent performance of an ultrasound examination of any type is reliant on an understanding of the basic physical principles that govern the production of ultrasound waves and their interaction with biological tissues of differing densities and consistencies. It is also necessary to understand the basic concepts of how the ultrasound systems work and the concepts underlying their manipulation ...

In this work, we proposed an effective method based on cubic and pantic B-spline scaling functions to solve partial differential equations of fractional order. Our method is based on dual functions of B-spline scaling functions. We derived the operational matrix of fractional integration of cubic and pantic B-spline scaling functions and used them to transform the mentioned equations to a syste...

introduction: the aim of this study was to evaluate the influence of different levels of external irrigation during irradiation with an erbium, chromium: yttrium-scandium-gallium-garnet (er,cr:ysgg) laser on the roughness and wear of dental tissue during scaling procedures. methods: twenty-five uniradicular bovine teeth had the proximal surfaces planed and divided into 3 regions: upper, middle ...

Burr formation is a common and undesirable phenomenon in metal cutting operations, reducing the quality, accuracy, functionality of component. In micromachining, burrs are smaller but comparable to feature size difficult remove. Most traditional deburring operations cannot be applied micromachined components without proper scaling, as on part very small prone damage. Ultrasonic energy widely us...

In order to improve the traditional methods of procyanidins extracting, ultrasonic-assisted filtration was used in the process of extracting proan-thocyanidin which was from membrane concentration of grape seed. Through the mechanism analysis of ultrasonic-assisted ultrafiltration, ultrasonic is able to alleviate the phenomenon of concentration polari-zation, so the efficiency of extracting pro...

measurement of soil saturated hydraulic conductivity, ks, is normally affected by flow patterns such as macro pore; however, most current techniques do  not differentiate flow types, causing major problems in describing water and chemical flows within the soil matrix. this study compares eight models for scaling ks and predicted matrix and macro pore ks, using a database composed of 50 datasets...