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Zhang M.,The Key Laboratory of Weak Light Nonlinear Photonics | Zhang M.,Nankai University | Yu H.,The Key Laboratory of Weak Light Nonlinear Photonics | Yu H.,Nankai University | And 3 more authors.
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2011

Optically transparent Er 3+/Yb 3+ codoped glass ceramics based on the system 60TeO 2-10CaF 2-25H 3BO 3 - 1Er 2O 3-4Yb 2O 3 have been successfully prepared by melt-quenching method at 900°C.The Er 2Te 5O 13 nanocrystals, whose phonon energy was 886 cm -1 by Raman measurement, were characterized by XRD and TEM in the tellurite glass ceramics. Both up-conversion and down-conversion emission spectra were measured. The red and green emissions have different luminescent processes under different excitation sources. The energy transfer processes were discussed individually. Source


Zhang X.,Nankai University | Liu X.,Nankai University | Pan L.,Nankai University | Pan L.,The Key Laboratory of Weak Light Nonlinear Photonics | And 2 more authors.
Biochemical and Biophysical Research Communications | Year: 2010

Several studies have been undertaken to elucidate the effects of electromagnetic field (EMF) on intracellular calcium ([Ca2+]i) in the past 20 years. However, still there were controversies of electromagnetic pollution within the scientific community. In this work, we studied the effects of alternative magnetic fields on intracellular calcium. Osteoblastic cells were used as a model both to test the hypothesis that extremely low-frequency (ELF) magnetic fields can alter the concentrations of the intracellular calcium, and to examine the 'window' effect predicted by our previous theoretical work. The outcome of this experiment demonstrated that 50 Hz, 0.8 mT magnetic field can induce the uptake of [Ca2+]i in osteoblasts. The empirical evidences of the specified window effects of [Ca2+]i in osteoblastic cells were reported for the first time in this work. © 2010 Elsevier Inc. All rights reserved. Source

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