Synthesis and Optical Properties of Sprayed ZnO and ZnO:Ga Thin Films

Characteristics and optical constants of pure and Ga-doped ZnO thin films have been studied. Pure and Ga-doped zinc oxide thin films were deposited onto glass substrates using the spray pyrolysis technique. Optical absorption studies in the wavelength range of 300–900 nm showed a peak near 450 nm for different doped films (in addition to the peak for un-doped ZnO). Increasing the doping concentration of Ga to 7% induced an increase in the optical constants of films. This increase is attributed to the formation of chargetransfer complexes. ZnO thin films doped with Ga have improved the optical transmittance in the visible region. The addition of Ga also induced an obvious increase in the optical band gap of these films; the optical band gap of Ga-doped films was slightly higher than that of undoped samples (3.1 eV). This study also found that the highest band gap (Eg=3.4 eV) occurred for the film deposited with a doping concentration of 5% gallium

Comparing Computing Platforms for Deep Learning on a Humanoid Robot

The goal of this study is to test two different computing platforms with respect to their suitability for running deep networks as part of a humanoid robot software system. One of the platforms is the CPU-centered Intel NUC7i7BNH and the other is a NVIDIA Jetson TX2 system that puts more emphasis on GPU processing. The experiments addressed a number of benchmarking tasks including pedestrian detection using deep neural networks. Some of the results were unexpected but demonstrate that platforms exhibit both advantages and disadvantages when taking computational performance and electrical power requirements of such a system into account.Comment: 12 pages, 5 figure

Optical Characterization of Silver Doped Poly (Vinyl Alcohol) Films

Silver-doped PVA films were prepared by casting method in order to study the effect of silver on the optical properties of poly(vinyl alcohol) using UV/VIS spectroscopy. It was found that these thin films have an indirect optical band gap (2.4-1.3) eV as the doping percentage increase. Extinction coefficient and refractive index increase as the doping percentage increase, while in general the optical dispersion parameters show an opposite behavior with dopin

Effects of Annealing on the Electronic Transitions of ZnS Thin Films

Thin films of zinc sulphide were prepared using a flash evaporation technique. The obtained thin films were subjected to heat treatment to investigate the effect of annealing on the transmittance spectrum and the electronic transitions. It has been found that annealing affected the transmission spectrum and caused an increase in the direct optical band gap. The optical parameters, oscillator energy E0 and dispersion energy Ed were determined using the Wemple DiDomenico single oscillator model. The optical energy gap obtained from the Wemple and DiDomenico model was in good agreement with the optical energy gap proposed by the Tauc theory

Penerapan Preventive Maintenance Dengan Menggunakan Metode Reliability Centered Maintenance Dengan Mengaplikasikan Grey Fmea Pada PT. Wxy

PT. WXY adalah Perusahaan yang bergerak di bidang pembuatan fruit cages (lori). Kendala yang dihadapi PT.WXY adalah terganggunya proses produksi yang disebabkan oleh kerusakan pada komponen mesin yang beresiko tingginya angka downtime. Masalah ini diselesaikan dengan menggunakan metode Reliability Centered Maintenance (RCM) yang mengaplikasikan Grey FMEA dalam menentukan prioritas perbaikan sehingga diperoleh perencanaan perawatan yang lebih optimal. Diagram pareto digunakan untuk menentukan mesin yang paling kritis pada metode RCM. Hasil diagram pareto diperoleh mesin bor magnet merupakan sistem yang paling kritis. Komponen yang terdapat dalam mesin bor magnet adalah saklar magnet, spindle, spindle sleeve, drilling chuck, motor NFA03LG-011, radial ball bearing, v-belt, dan pulley. Selanjutnya hasil penerapan Reliability Centered Maintenance dengan mengaplikasikan Grey FMEA diperoleh komponen yang harus dirawat secara terjadwal (time directed) adalah spindle dengan jadwal perawatan 33 hari, motor NFA03LG-011 dengan jadwal perawatan 36 hari, radial ball bearing dengan jadwal perawatan 43 hari, dan v-belt dengan jadwal perawatan 42 hari. Perawatan komponen yang tidak terjadwal (condition directed) adalah saklar magnet, spindle sleeve, drilling chuck, dan pulley. Penerapan metode RCM dengan melakukan simulasi terhadap distribusi kerusakan diperoleh penurunan downtime sebesar 20.56%