As an application of the ring filters, a new and simple method to determine an inherent-ring-resonance frequency and an effective loss tangent at a frequency of interest is introduced. When a certain condition is satisfied in the ring filters, a frequency, where all the excited power is reflected, exists. That is the inherent-ring-resonance frequency and the effective loss tangent from its reflection coefficient may be obtained correctly. To verify the method, two ring filters have been fabricated in microstrip lines and the measured results show good agreement with the predicted ones.
Moments are widely-used feature extractors due to their superior discriminatory power and geometrical invariance. Unfortunately, moments suffer heavy computational load and result long time spending. In viewing of the problem, we proposed a new technique in using moments- apply moments on wavelet subband. In this study, pseudo Zernike moments are selected as feature extractors due to its enhanced feature representation capability. Implementation of moments on wavelet subband affords advantages of performing local-to-global analysis and decomposing image into lower resolution. Experimental results show that this hybrid achieves computational time reduction of 36.23% with enhanced authentication performance.
We calculated temperature dependence of photoluminescence (PL) lifetime of fac tris(2-phenylpyridine) iridium (Ir(ppy)3) doped in 4, 4'-N, N'-dicarbazole-biphenyl (CBP). The emitting triplet state consists of three zero-field splitting substates. Taking into account non-radiative transitions among these substates, rate equations for the populations of the substates are solved and three PL lifetimes are derived. A good agreement has been obtained for the temperature dependence between the observed lifetime and calculated long lifetime.