In this paper, GaN-based light-emitting diodes (LEDs) with photonic quasi-crystal (PQC) structure on p-GaN surface and n-side roughing by nano-imprint lithography are fabricated and investigated. At an injection current of 20 mA, the LED with PQC structure on p-GaN surface and n-side roughing increased the light output power of the InGaN/GaN multiple quantum well LEDs by a factor of 1.42, and t...

ABSRACT High speed machining is a relatively new production technology that allows higher productivity, excellent surface finish and good dimensional accuracy in the manufacturing process. Therefore these technologies have considerable advantages over traditional machining technologies. Instead of conventional machining chain that consists of roughing in soft state + semi fininshing + hardening...

In this design an optical ring resonator are embedded between two Horizontal input and output waveguides which has 4 orbitals around the center of the resonator so that each orbital consists of 8 rods with different size in which radius of larger orbitals rods are bigger than radius of smaller orbitals rods. The analysis of simulation results showed the proposed filter has the transmission effi...

Control of hot metal rolling process plays an important role in assuring high product quality and safe process operation. Although there have been many looper control technologies recently developed for finishing rolling processes, looperless interstand tension control of roughing and intermediate rolling mills remains a hard-to-solve problem. This paper proposes a current comparison based inte...

Machining operations for freeform surface features usually include roughing, ®nishing for the bottom surface, tapering, and corner rounding. Strategies and algorithms to decompose the overall task into these operations are presented. The decomposition aims at minimizing machining time within the constraints of the speci®ed surface roughness and tolerance, and machine tool safety. The roughing o...

State-of-the-art filtered backprojection (FBP) algorithms often define the filtering operation to be performed along non-horizontal filter lines in the detector. For non-horizontal filter lines, a limited scan field of view leads to axially as well as trans-axially truncated projections. In this work, we investigate the influence of axial and trans-axial data truncation on the reconstruction re...

In this paper, the high-efficient and reconfigurable lined-based architectures for the 9/7-5/3 discrete wavelet transform (DWT) based on lifting scheme are proposed. The proposed parallel and pipelined architectures consist of a horizontal filter (HF) and a vertical filter (VF). The critical paths of the proposed architectures are reduced. Filter coefficients of the biorthogonal 9/7-5/3 wavelet...