In modern PET scanners, image reconstruction is performed sequentially in two steps regardless of the reconstruction method: 1. Attenuation correction factor computation (ACF) from transmission scans, 2. Emission image reconstruction using the computed ACFs. This reconstruction scheme does not use all the information in the transmission and emission scans. Post-injection transmission scans cont...

We optimize the efficiency of a quantum-dot-based micropillar single-photon source by minimizing spontaneous emission into unwanted background modes. perform numerical investigation emission, where we identify semi-periodic enhancement with diameter. At these peaks is reduced ?20%, and show how this reduction can be avoided simply choosing diameter away from peaks. Finally, analyze discrepancy ...

We present simultaneous Hα, Na i D 1 , D 2 , and He i D 3 spectroscopic observations on the RS CVn system UX Ari. We have found a dramatic increase in the excess Hα emission equivalent width by a factor of 2 in an interval of 1 day that indicates the beginning of a strong flare in this system. The presence of the He i D 3 in emission in coincidence with the enhancement of the Hα emission confir...

A new and general approach enabling us to amplify not only the bandgap emission of ZnO nanorods but also the defect emission of Al(2)O(3) is proposed. The light intensity of the band edge emission of ZnO nanorods can be improved by as much as 19 times after the decoration of Al(2)O(3) layers. Moreover, white light emission arising from Al(2)O(3) defects in ZnO/Al(2)O(3) nanostructures also show...

Introducing the use of the Factor Analysis method to analyze electron emission spectra we identify different mechanisms for electron emission from clean Al surfaces under bombardment by Ar and Li ions. The analysis of the energy electron emission distributions and their dependence on incoming ion energy allows separation of the direct contribution of Auger neutralization from that of plasmon de...

In this study, based on the Environmental Kuznets Curve (EKC) framework, we empirically examine the effects of trade openness and the level of economic development on pollution emission across the Chinese provinces. Our regression analysis shows that increasing trade openness contributes to higher pollution emission, where the effect of the former may be realized through its impacts on total fa...