metal spinning as a kind of manufacturing process has capability to shape hollow components. in present work shear spinning process is used to formplates into conical shapes. moreover, the aim of this research is to demonstrate the impact of the process parameters (i.e. feeding rate and spindle speed) on wall thickness. this approachwas done by experimental and finite elements method. the resul...

Core yarn was spun by introducing a PVA multifilament as the core through the yarn forming zone of a ring spinning frame and viscose fibers as the sheath containing tracer fibers. The water soluble PVA multifilament was extracted from the yarn structure. Then internal structure and properties of the hollow ring yarn was assessed and compared with those of typical ring yarns. Also, two plain fab...

used pet bottles disposal is an unsolved environmental problem, and there are many efforts for finding an applicable solution for it. many researches have showed that the degradation rate of the polymers increase with the smaller size of fibers. this work was carried out to convert used pet bottles into nanofibers by melt-electrospinning method. uncolored, washed and chipped pet bottles and the...

This paper presents the electromagnetic (EM) 3-D modeling, hardware measurement, and optimization of hybrid packaged electro-optical transmitters. The initial application is targeted for 10 Gb/s Ethernet and SONET fiber optic communication links. The hybrid package includes a micromachined silicon optical bench, a InP laser and monitor photodiode, a hermetically-sealed lid, integrated impedance...

Lead zirconate titanate (PZT)-based ferroelectric ceramic materials are piezoelectric of commercial importance. Strontium (SZT) perovskite also have a wide application area. PZ and SZT starting solutions can be prepared using variety suitable methods. Among these methods, the sol-gel process has attracted special attention due to low temperature requirement, homogeneity ability obtain appropria...

We report the development and characterization of 2-D photonic crystal (PC) microcavity devices on silicon on insulator. The transmission of light through a 2-D PC microcavity near resonance can be switched on and off by modulating the refractive index of the PC. Because silicon has poor electro-optical properties, it is advantageous to insert electro-optic materials inside the air holes. In th...