Abstract High impedance ratio ( Z -ratio), low temperature coefficient of frequency (TCF) and spurious free characteristic are three main requirements for surface acoustic wave (SAW) resonators. The reported LiTaO 3 /Quartz (Qz) hetero layer (HAL) resonator can satisfy them, but the bandwidth is too narrow. LiNbO (LN) suitable wideband resonators, TCF large due to its high coupling factor. In t...

The algorithmic techniques for the implementation of the Linear Discriminant Analysis (LDA) play an important role when the LDA is applied to the high dimensional pattern recognition problem such as face recognition or veriication. The LDA implementation in the context of face recognition and veriication is investigated in this paper. Three main algorithmic techniques: matrix transformation, th...

In this paper, a tri-reflector compact antenna test range (CATR) consisting of main parabolic reflector with square aperture 3 m in side length and two sub-reflectors rotationally standard quadric surfaces working terahertz is proposed. By using the equivalent paraboloid theory cross-polarization elimination conditions then combining appropriate shaped feed, low good quiet zone (QZ) performance...

In this article the instability of single phase flow in a circular pipe from laminar to turbulence regime has been investigated. To this end, after finding boundary conditions and equation related to instability of flow in cylindrical coordination system, which is called eigenvalue Orr Sommerfeld equation, the solution method for these equation has been investigated. In this article Chebyshev p...

Introduction Non-water-suppressed (NWS) MRS techniques [1,2] have been recently investigated for the benefits that the un-suppressed water signal in NWS MRS serving as an internal reference for reliable metabolic quantification while avoiding the possible distortion of metabolite signal by water suppression (WS) pulses. However there are still some problems originating from the huge water peak....

Abstract The influence of the reflected waves at bonding boundary on resonance waveform and temperature characteristics was investigated using α-quartz (QZ). double-layered resonator specimen fabricated 129.55°Y- 0°Y-cut QZ substrates with thickness ratio x=0.520. characteristic range from 100°C to 300°C deviated calculated values estimated by equations considering electric flux density propose...

2014 We study shear flow instabilities in nematic liquids of planar geometry (molecules parallel to the plates limiting the sample) and where molecules are aligned (along Ox) perpendicular to the shear flow direction (along Oy). An external magnetic field reinforces the alignement imposed by surface effects. We develop a bidimensional model which takes into account exactly boundary conditions o...