Cu20 microcrystallites of the size range 55-73 A were embedded in the nano-zirconia thin film matrix f precursor contains zirconium oxychloride octahydrate and cupric nitrate trihydrate. Absorption and fi uorescence spectra of the films annealed at different temperature, 200°-1200°C revealed that the microcrystallites are possessing both mono-and biexcitonic behaviours which are dependent on microcrystallite size. Maximum biexcitonic behaviour has been predicted in the case of450°C annealed sample (size 69 A, cal.) which also showed phosphorescence possibly due to inter-crossing of potential energy curve of Cu20 exciton and 3D offreeThe anisotropic nature ofthe excitonic transitions ofCu2O was also observed due to electrical quadrupole fransition which was authenticated by its emission and ESR spectral studies.
Rotational invariant texture classification is required for many real world applications. Rotation invariant texture features are derived from the even symmetric Gabor filtered images of texture. The feature used is AAD (average absolute deviation) from mean. It can be shown that rotation of input image is equivalent to a translation of the channel output along the orientation axis. This property is exploited to convert rotational variant features to rotational invariant features. Discrete Fourier Transform of the feature is taken in rotation dimension to make the feature rotation invariant. The classification of 45 Brodatz textures rotated in 12 different directions is done using these features. The number of samples used for training and testing phase are 4320. The percentage correct classification is 85.25.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.