文丘里面罩加温湿化法在气管切开脱机患者氧疗中的应用

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,     

Vacuum Ultraviolet Excited Photoluminescence Properties of Novel Na3Y9O3（BO3）8：Tb^3＋ Phosphor

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.