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正常人体上呼吸道对吸入气体有加温、湿化和过滤作用,保证气道黏膜纤毛正常活动,从而起到气管自净作用。在温度37℃、相对湿度100%的情况下,黏液可保持适当的黏度。气管切开患者机械通气期间,南于呼吸机本身携带湿化器,可以满足患者气道湿化的要求,但此类患者多数需要反复间断的进行脱机锻炼直至最后完全撤机,部分患者虽无需呼吸机帮助, 相似文献
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Vacuum Ultraviolet Excited Photoluminescence Properties of Novel Na3Y9O3(BO3)8:Tb^3+ Phosphor 总被引:1,自引:0,他引:1 下载免费PDF全文
The novel vacuum ultraviolet (VUV) excited Na3 Y9O3 (BO3)8:Tb^3+ (NYOB:Tb^3+) green phosphor is prepared. Strong VUV photoluminescence and high quenching concentration of Tb^3+ (20 wt%) are observed in NYOB: Tb^3+ and the strong emission are correlated with the unique layer-type structure of NYOB. All the characteristic 4 f - 5d transitions of Tb^3+ and the host absorption band in VUV region are identified in the excitation spectrum. Based on the results, the energy levels scheme of Tb^3+ in NYOB:Tb^3+ is first established. This newly developed NYOB:Tb^3+ phosphor shows excellent optical properties when compared with the commercial Zn2SiO4:Mn^2+ and would be a potential VUV-excited green phosphor. 相似文献
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