基于菌紫质膜联合子波变换的实时模式识别

菌紫质是一种结构和功能与高级动物视网的视生色素－－视紫红质极为相似的蛋白南，是一种优异的可逆光全息记录材料，子波变换是目标特征抽取和模式识别和有效方法。本文钭联合子波变换和菌紫质膜优异的光学全息记录特性结合起来，提出了一种全新的光学全息实时模式识别方案，给出了相应的实验结果。     

Improved photoluminescence and afterglow in CaTiO3:Pr with addition of nanosized SiO2

Enhancement of the ¹D₂-³H₄ red emission in CaTiO₃:Pr³⁺ with addition of nanosized SiO₂ fabricated by a solid state reaction method is reported. The dynamical processes for the improvement of red emission were systematically investigated using photoluminescence (PL) and PL excitation spectra, and diffused reflectance spectra as well as time decay patterns of PL and persistent afterglow. Higher efficiency of energy transfer from CaTiO₃ host to the activator Pr³⁺ due to the improvement of crystallinity by SiO₂ addition was discussed in comparison with that of the SiO₂ free sample. The enhancement of persistent afterglow after the cessation of excitation in SiO₂ added CaTiO₃:Pr³⁺ was also analyzed by theoretically fitted results.     

Versatile Spirocyclic Glycine‐Based Nitrones and Their Highly Stereoselective 1,3‐Dipolar Cycloaddition

A convenient and efficient method for the synthesis of novel spirocyclic nitrones prepared from glycine derivatives is reported. The 1,3‐cycloaddition reactions of the nitrones with alkenes lead to novel isoxazolidines in high yields and with excellent regio‐ and stereoselectivity.