The effects and heat transfer mode of water film and sprinkler system on the heat-resistant property associated with the insulation of a fireproof glass were investigated. In the experiments, fireproof glass with a si...The effects and heat transfer mode of water film and sprinkler system on the heat-resistant property associated with the insulation of a fireproof glass were investigated. In the experiments, fireproof glass with a size of 3 300 mm (height) × 2 200 mm (width) × 12 mm (thickness) was exposed to an oil pool fire with a power of approximately 1.4 MW. The experimental results show that the application of the water film or sprinkler system on the glass can effectively resist the intensive heat from the fire in the test due to the absorption of latent heat. The permitted period of integrity and insulation with a water film and a sprinkler system could be extended to 60 min. It should be noted that the temperature of the glass surface can be kept under 60 °C in a 60 min test. The experimental results suggest that it is feasible to substitute fireproof glass with water film for a fireproof door as long as the water film or sprinkler system can work stably and water can cover the whole surface of the fireproof glass.展开更多
Effects of Nb_(2)O_(5)dopant on the radiation response of barium gallo-germanate(BGG)glass are studied mainly by electron paramagnetic resonance and absorption spectroscopy.Owing to the Nb^(5+)$Nb^(3+)interconversion ...Effects of Nb_(2)O_(5)dopant on the radiation response of barium gallo-germanate(BGG)glass are studied mainly by electron paramagnetic resonance and absorption spectroscopy.Owing to the Nb^(5+)$Nb^(3+)interconversion in doped samples,formations of Ge-related non-bridging oxygen hole center and Ge-related electron center defects after g-ray irradiation are inhibited.Thereby,Nb_(2)O_(5)dopant can enhance radiation resistance of BGG glass,and 1.0%Nb2O5 concentration is the best.展开更多
A kind of new scintillating glass based on PbO-Bi2O3 heavy-metal oxides was prepared by doping a certain amount of SiO2, B2O3 and a little Ce3+ ions as fluorescence agent using conventional melt quenching technology. ...A kind of new scintillating glass based on PbO-Bi2O3 heavy-metal oxides was prepared by doping a certain amount of SiO2, B2O3 and a little Ce3+ ions as fluorescence agent using conventional melt quenching technology. The fluorescence properties of the glass were investigated by means of ultraviolet-visible (UV-VIS) absorption spectrum, excitation spectrum, emission spectrum, multi-channel time spectrum and transmission spectrum. The results show that the density of the glass reaches 7.89 g/cm3, and its fluorescence emission wavelength is 547 nm, fluorescence fade time 18.68 ns. Compared to CeF3, YAP, GSO, ThF4 and PbF4 etc. scintilla-ting crystals, the glass has a higher density, a faster scintillation decay constant, a longer emission wavelength and cut off wavelength. But its ability of radiation-resistance must be improved in order to meet the requirements of application in high energy physics experiments under 106 rad radiation in Co60 source.展开更多
基金Project(2006BAK06B02) supported by the National Science and Technology Pillar Program during the Eleven Five-Year Plans of ChinaProject(70701019) supported by the National Natural Science Foundation of China
文摘The effects and heat transfer mode of water film and sprinkler system on the heat-resistant property associated with the insulation of a fireproof glass were investigated. In the experiments, fireproof glass with a size of 3 300 mm (height) × 2 200 mm (width) × 12 mm (thickness) was exposed to an oil pool fire with a power of approximately 1.4 MW. The experimental results show that the application of the water film or sprinkler system on the glass can effectively resist the intensive heat from the fire in the test due to the absorption of latent heat. The permitted period of integrity and insulation with a water film and a sprinkler system could be extended to 60 min. It should be noted that the temperature of the glass surface can be kept under 60 °C in a 60 min test. The experimental results suggest that it is feasible to substitute fireproof glass with water film for a fireproof door as long as the water film or sprinkler system can work stably and water can cover the whole surface of the fireproof glass.
基金supported by China National Funds for Guangdong Key Research and Development Program(Grant No.2018B090904001)the Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program(Grant No.2017BT01X137)+2 种基金Key Laboratory of Laser Device Technology Foundation of China Ordnance Industry Group Co.(Grant No.KLLDT202010)the Key R&D Program of Guangzhou(Grant No.202007020003)the National Natural Science Foundation of China(Grant No.52002131)。
文摘Effects of Nb_(2)O_(5)dopant on the radiation response of barium gallo-germanate(BGG)glass are studied mainly by electron paramagnetic resonance and absorption spectroscopy.Owing to the Nb^(5+)$Nb^(3+)interconversion in doped samples,formations of Ge-related non-bridging oxygen hole center and Ge-related electron center defects after g-ray irradiation are inhibited.Thereby,Nb_(2)O_(5)dopant can enhance radiation resistance of BGG glass,and 1.0%Nb2O5 concentration is the best.
文摘A kind of new scintillating glass based on PbO-Bi2O3 heavy-metal oxides was prepared by doping a certain amount of SiO2, B2O3 and a little Ce3+ ions as fluorescence agent using conventional melt quenching technology. The fluorescence properties of the glass were investigated by means of ultraviolet-visible (UV-VIS) absorption spectrum, excitation spectrum, emission spectrum, multi-channel time spectrum and transmission spectrum. The results show that the density of the glass reaches 7.89 g/cm3, and its fluorescence emission wavelength is 547 nm, fluorescence fade time 18.68 ns. Compared to CeF3, YAP, GSO, ThF4 and PbF4 etc. scintilla-ting crystals, the glass has a higher density, a faster scintillation decay constant, a longer emission wavelength and cut off wavelength. But its ability of radiation-resistance must be improved in order to meet the requirements of application in high energy physics experiments under 106 rad radiation in Co60 source.
