The complex band structure, large spin-orbit induced splitting, and heavy effective mass of two-dimensional (2D) hole systems hosted in GaAs quantum wells render them rich platforms to study many-body physics ballistic transport phenomena. Here we report ultra-high-quality (001) 2D systems, fabricated using molecular beam epitaxy modulation doping, with mobility values as high $5.8\times10^6$ c...

We show that the length of a queue communicates information about the quality of a product when some consumers are uninformed. In turn, a firm may strategically choose its service rate to signal its quality through the queue. In our setting, a firm may have high or low quality and sells a good to consumers who are heterogeneously informed. The firm may choose a slow or (at a cost) a fast servic...

A photonic crystal defect consisting of several subwavelength holes was investigated as a means to increase the surface area of the defect region without compromising the quality factor of the structure. Finite-difference time-domain calculations were performed to determine the relationships between the size of the multi-hole defect (MHD) region, resonance frequency, quality factor, and refract...

this study is focused on investigating the parameters of laser percussion drilling process of nickel-base super alloy inconel 718 with thickness of 1 mm. fiber laser with the power of 500 watts was used as the laser source. laser pulse frequency, duty cycle, laser power, focal point position, were assumed as the laser drilling process variables. the hole geometry features, i.e. entrance hole di...

Cutting efficiency and quality are very sensitive to gas jet pressure and nozzle standoff distance. Do a high gas pressure and a small standoff distance necessarily give better material removal capability and cutting quality? Simple experiments to measure the mass flow rate were carried out for two types of geometry: a circular hole and a linear cut directly underneath an axisymmetric nozzle. T...