Effects of Annealing on the Structural and Photoluminescent Properties of Ag-Doped ZnO Nanowires Prepared by Ion Implantation

ZnO nanowires deposited on Si substrates were prepared by thermal evaporation of a mixture of ZnO and carbon powder. Ag ions with an energy of 63 keV and a dose of 5×1015 ions/cm-2 were implanted into the as-prepared ZnO nanowires. After ion implantation, the Ag-implanted ZnO nanowires were annealed in air at different temperatures from 600℃ to 1000℃. Effects of ion implantation and thermal annealing on the structural and photoluminescent (PL) properties of the ZnO nanowires were investigated by transmission electron microscopy (TEM), selected area energy dispersive X-ray spectroscopy (SAEDX), X-ray diffraction (XRD), and fluorescence spectrophotometry. TEM, HR-TEM, and SAEDX analyses demonstrated that efficient doping of Ag was achieved by ion implantation and the subsequent annealing process. XRD patterns revealed that the hexagonal wurtzite structure of ZnO nanowires was maintained after ion implantation. Photoluminescent emissions of ZnO nanowires were decreased significantly by Ag implantation but could be recovered by thermal annealing. The mechanism of the influence of ion implantation and annealing on the PL intensity was assessed.     

玫瑰茄果冻的配方与加工工艺研究

以玫瑰茄为主要原料,魔芋粉、卡拉胶、黄原胶、琼脂为主要凝胶剂,通过响应面试验设计研究玫瑰茄果冻的配方和加工工艺。结果表明,最佳配方为:以果冻质量100 g为基准,凝胶剂用量0.5%,白砂糖用量13.5%,2%柠檬酸溶液0.4%,玫瑰茄汁用量3.2%,在该条件下制得的果冻外形完整、弹性适宜、酸甜可口、口感细腻、质地均匀,色泽呈鲜明的红宝石色,有玫瑰茄独特的风味。     

肺表面活性物质联合双相呼吸道正压通气治疗新生儿呼吸窘迫综合征的临床研究

目的: 观察肺表面活性物质联合双相呼吸道正压通气（BIPAP）治疗新生儿呼吸窘迫综合征（NRDS）的临床疗效及其对氧交换指标的影响。方法: 86例行BIPAP的NRDS患儿根据是否使用肺表面活性物质（PS）分为对照组（未使用PS,35例）和观察组（使用PS,51例）。比较两组治疗前及治疗24、48 h后的动脉血氧分压（PaO2）、氧合指数（PaO2/FiO2）、pH值、动脉血二氧化碳分压（PaCO2）、动脉血氧分压与肺泡氧分压比值（PaO2/PAO2）、机械通气参数及存活率、机械通气时间、住院天数。结果: 观察组的存活率为94.1%,高于对照组的85.7%。观察组的机械通气时间、用氧治疗时间、住院时间均少于对照组（P<0.01）,治疗前两组的PaO2、PaCO2、pH、PaO2/FiO2、PaO2/PAO2之间的差异均无统计学意义（P＞0.05）。治疗后,两组在24、48 h时各指标均较治疗前逐渐改善。观察组在治疗后各时间点的PaO2、pH、PaO2/FiO2、PaO2/PAO2均较对照组升高明显,PaCO2降低明显（P<0.05）。治疗后,对照组呼气末正压（PEEP）呈升高趋势,观察组PEEP呈逐渐降低趋势（P<0.05）。观察组在治疗后各时间点的吸入氧浓度（FiO2）、平均气道压力（MAP）、PEEP均较对照组降低明显,差异均有统计学意义（P<0.05）。结论: 肺表面活性物质联合双相呼吸道正压通气治疗NRDS,可有效改善患儿的肺通气功能,降低患儿病死率,减少住院时间,改善预后。