RESUMO
The two-dimensional photonic crystal (Ni mesh with square lattice of 10 µm) was prepared and Ni film was thickened to 3 µm by electroplating. Its optical properties and its influence on the infrared absorption of sodium nitrate were investigated. The results show that there is a transmission peak centered at 1 450 cm-1 under normal incidence, and the peak covered the frequencies ranging from 1 300 to 1 500 cm-1, the antisymmetric stretching vibration of nitrate. Moreover, the change of absorption intensities of nitrate's antisymmetric stretching vibration is essentially consisting with the transmittance of photonic crystal. It indicates that the absorption intensity of sodium nitrate is improved by the modulated infrared light.
RESUMO
BACKGROUND & OBJECTIVE: Sellar region tumors are common intracranial tumor. This study was designed to investigate the methods of the removal of tumors in sellar region by pterional approach. METHODS: A total of 119 cases with sellar region tumors were performed operation. Before the operation, the relationships between the tumors and their periphery were determined according to CT, MR and the cerebral angiography and then the tumors were removed by pterional approach microsurgery in 4 different spaces. RESULTS: The number of the patients treated with total, subtotal, and partial resection were 72, 36, and 11, respectively; with 85 cases significantly improved, 24 getting better, 8 without changes and 2 dead. Follow-up half a year, 92 cases were survival in the half a year of follow-up, in which 61 cases were able to work with normal life, 15 could do light work, 9 could take care of themselves but 6 patients were disabled, and 1 died of heart disease. CONCLUSION: Pterional approach can be used to remove many kinds of tumors in sellar region and with better exploration, therefore, increase the total removal and cure rate of such tumors.
