Papers by Keyword: Straight

Abstract: The torsion beam design for the micromirrors has an important effect on electrostatic behavior. We investigated three torsion beam designs and determined their effect on electrostatic characteristics as well as resonant frequency. The first design is straight torsion beam, which is the simplest and most commonly used. The second and third designs, add different folded structure to improve the performance. The results suggest that the folded-beam design has a significant effect on actuation performance. The most effective design had a driving voltage approximately one half of that for the simplest design, and the effect on resonant frequency is slightly more modest but still impressive.

Abstract: Speech synthesis is a hot research of artificial intelligence today, and urgent difficulty to overcome is how to make the machine more "emotional intelligence" for the human-computer interaction. With the STRAIGHT algorithm, this paper extracted the acoustic feature parameters of the speech signals and did statistical analysis, modified the characteristic parameters of the neutral sounds to synthesize emotional speeches, including happy, angry, frustration, then analyzed a frame of spectrum of synthetic emotional speeches through standard voices, voices added noise and voices de-nosing. The experimental results show that the method is feasible and the synthetic emotional speeches through voices de-nosing are better than voices added noise.

Abstract: Two types of helical and straight carbon nanofibers, have been synthesized by the decomposition of acetylene using cupric carbonate basic as catalyst precursor at low temperature. The obtained carbon nanomaterials were characterized by transmission electron microscope, scanning electron microscope, and X-ray power diffraction. The size of the catalyst nanoparticles remaining inside the resultant nanofibers was determined. The carbon nanofiber diameters, ranging from 30 to 400 nm, closely correlated with the size of the catalytic nanoparticle. The growth mechanism of carbon nanomaterials was also studied. The nanocopper particle size had a considerable effect on the morphology of carbon nanofibers. The helical carbon nanofibers with a symmetric growth mode were synthesized with the nanocopper catalyst particles having a grain size less than 50 nm. When the average catalyst particle size determined was around 50–300 nm, the straight carbon nanofibers were obtained dominantly.

Abstract: This paper describes the morphology and microstructure of graphitic nanofibers(GNFs) synthesized by the catalytic decomposition of ethylene in the presence of Ni:Cu(70wt%:30wt%) as catalyst at 550°C to 700°C. The catalyst was prepared by the coprecipitation method using aqueous solution of metal nitrates. The catalysts and the graphitic nanofibers(GNFs) were characterized by FE-SEM, HR-TEM and EDXS. The shape, composition and microstructure of the catalyst according to the synthesis temperature of graphitic nanofibers(GNFs)were changed so that it brought about the change of morphology and microstructure of graphitic nanofibers(GNFs). In particular, it should be noted that the composition change of catalysts with different synthesis temperature is one of the key factors in determining the morphology of graphitic nanofibers(GNFs)