Pure Aluminum Single Crystal Study on Point Defect Dependence of Ultrasonic Longitudinal Wave Velocity

Group velocity dependence of propagation losses in single-line-defect photonic crystal waveguides on GaAs membranes - Electronics Letters

Introduction: Two-dimensional (2D) photonic crystal (PC) waveguides are expected to be one of the significant platforms in future optical communication networks. To date, much effort has been devoted to the light guidance by 2D-PC line-defect waveguides that achieve a 3D optical confinement by use of a combination of the photonic bandgap and total internal reflection [1–5], and small propagatio...

An Experimental and Theoretical Study of Freezing of Pure Aluminum

In this work, Boltzmann transform has been used to analyze the problem of freezing of pure Aluminum in semi-infinite domain. The uniqueness of solution (solidification front location) has been proved using the characteristics of the functions appeared in solution. The effect of density change on temperature distribution and errors resulting from ignoring this change have been investigated. The ...

A one-dimensional model for variations of longitudinal wave velocity under different thermal conditions

Ultrasonic testing is a versatile and important nondestructive testing method. In many industrial applications, ultrasonic testing is carried out at relatively high temperatures. Since the ultrasonic w...

Stress wave velocity patterns in the longitudinal-radial plane of trees for defect diagnosis

Development of Aluminum Nitride Single-Crystal Substrates

High-frequency, high-power semiconductor devices are widely used in electric vehicles, medical equipment, home appliances, and communication equipment. Recently, there has been a growing demand for semiconductors that have such characteristics as high withstand voltage, high speed and high-temperature operation, low power consumption and radiation resistance. To meet this demand, silicon carbid...