Titanium dioxide nanopowders doped with different amounts of Fe ions were prepared by coprecipitation method. Obtained materials were characterized by structural (XRD), morphological (TEM and SEM), optical (UV/vis reflection and photoluminescence, and Raman), and analytical techniques (XPS and ICP-OES). XRD analysis revealed rutile crystalline phase for doped and undoped titanium dioxide obtain...

This paper explores the application of principal component analysis (PCA) to the monitoring of within-lot and between-lot plasma variations that occur in a plasma etching chamber used in semiconductor manufacturing, as observed through Optical Emission Spectroscopy (OES) analysis of the chamber exhaust. Using PCA, patterns that are difficult to identify in the 2048-dimension OES data are conden...

This paper presents the single channel speech enhancement system using subband Kalman filtering by estimating optimal Autoregressive (AR) coefficients and variance for speech and noise, using Weighted Linear Prediction (WLP) and Noise Weighting Function (NWF). The system is applied for normal and Oesophageal speech signals. The method is evaluated by Perceptual Evaluation of Speech Quality (PES...

D oes the equation x + y + z = 29 have a solution in integers? Yes: (3,1,1), for instance. How about the equation x + y + z = 30? Again yes, although this was not known until 1999: the smallest solution is (−283059965,−2218888517, 2220422932). And how about x + y + z = 33? This is an unsolved problem. Of course, number theory does not end with the study of cubic equations in three variables: on...

Abstract The deposition process using the sputtering method is a technique that produces thin layer. can be used with some modifications made to system. One of identifications through results Optical Emission Spectroscopy (OES) spectrum. By analyzing OES spectrum in system, it seen condition plasma formation chamber. gas system Argon. varying voltage, flow rate, pressure and temperature substra...

D oes your paediatrician have difficulty concentrating during lectures, particularly those on molecular biology and healthcare planning? When taking a history, does your paediatrician not listen properly and keep asking the same questions? Is your paediatrician too busy to spend any time with his or her own children? These are all signs of ADHD(P), a newly described phenotype of attention defic...