Fe、Mn掺杂干凝胶的制备、表征及催化臭氧氧化邻二氯苯性能(英文)

采用溶胶-凝胶法制备Fe、Mn掺杂的干凝胶材料(XFe和XMn),并对其催化臭氧氧化去除邻二氯苯(o-DCB)的性能进行了研究.通过X射线光电子能谱(XPS)、X射线衍射(XRD)、透射电镜(TEM)、扫描电镜(SEM)、压汞仪和氮气吸附等技术对Fe、Mn掺杂的干凝胶材料进行表征.结果表明:XFe和XMn中存在三价金属氧化物等活性物种,金属相无明显的衍射峰且金属颗粒的尺寸较小,表明金属颗粒在干凝胶载体上获得较好的分散性;相比于单独臭氧氧化时44%的o-DCB去除率,XFe和XMn的添加使得o-DCB去除率分别达到58%和72%,XFe和XMn显示了较好的催化活性;XFe和XMn的金属溶出状况不同,在水溶液中浸泡5h后它们的金属溶出率分别为2%和8%左右.     

射频溅射制备α－Ge／SiO2多层膜

射频溅射制备α－Ｇｅ／ＳｉＯ２多层膜崔敬忠彭军张兴旺陈光华张仿清（兰州大学物理系，兰州７３００００）由于在非晶太阳能电池和半导体器件方面的重要性，α－Ｇｅ和α－ＳｉＯ２得到了深入的研究［１，２］．近年来，用共溅射的方法制备的Ｇｅ／ＳｉＯ２纳米材料由...     

STRESS ANALYSIS IN CUBIC BORON NITRIDE FILMS BY X-RAY DIFFRACTION USING sin2 ψ METHOD

The boron nitride (BN) films containing cubic boron nitride (c-BN) and hexagonal boron nitride (h-BN) were prepared by radio frequency a ssisted thermal filament chemical vapor deposition. The stress and strain in BN films were investigated by X-ray diffraction analysis using the sin² ψ method. The results showed that both c-BN and h-BN in the same film have similar values of elastic strain, however, the compressive stress in c-BN is much greater than that in h-BN for the same film. Both stress and strain gradually decre ased with the increase of substrate temperature (T_s). The effective stress in the films calculated by the effective stress model increased with the increase of T_s. Furthermore, the dependence of effective stress in the films on T_s was also investigated.     

ADS-B系统的故障模式、影响及危害度分析FMECA

针对空中交通管制领域使用的ADS-B这种新兴设备和技术,根据该系统5年的的故障数据,利用故障模式、影响及危害度分析（FMECA）分析方法,对故障模式进行了统计、分类、原因分析和危害度计算,制定了系统FMECA工作表,指出了该系统的可靠性薄弱环节,为可靠性设计和分析并制定可靠性保障措施提供了依据。     

CVD法沉积金刚石薄膜中成核与生长的势垒研究

探明成核与生长的机理对于沉积高质量金刚石薄膜是十分重要的.本文采用PM3方法,计算了化学汽相沉积金刚石薄膜成核与生长阶段反应势垒.研究了对于不同反应气体(甲烷和乙炔)脱氢和增加沉积基团势垒的差异.结果说明,无论是成核阶段,还是生长阶段,脱氢势垒都小于加生长基团的势垒.然而,增加乙炔基的势垒大于增加甲基的势垒,这可能是因为乙炔分子必须打开C≡C键才能沉积到衬底表面.     

STRESS ANALYSIS IN CUBIC BORON NITRIDE FILMS BY X-RAY DIFFRACTION USING sin2 ψ METHOD

The boron nitride (BN) films containing cubic boron nitride (c-BN) and hexagonal boron nitride (h-BN) were prepared by radio frequency a ssisted thermal filament chemical vapor deposition. The stress and strain in BN films were investigated by X-ray diffraction analysis using the sin² ψ method. The results showed that both c-BN and h-BN in the same film have similar values of elastic strain, however, the compressive stress in c-BN is much greater than that in h-BN for the same film. Both stress and strain gradually decre ased with the increase of substrate temperature (T_s). The effective stress in the films calculated by the effective stress model increased with the increase of T_s. Furthermore, the dependence of effective stress in the films on T_s was also investigated.     

RP-HPLC法测定唐古特铁线莲中芦丁的含量

建立了唐古特铁线莲中芦丁含量测定的RP-HPLC方法.色谱条件:采用C18柱 (4.6 mm×250 mm,5 μm),流动相:V(甲醇)∶V(0.4% H3PO4)=55∶45,流速:1.0 mL/min,柱温:30 ℃,检测波长:360 nm,芦丁在0.24～1.2 μg范围内成良好的线性关系,r=0.9992,回收率RSD=1.0%,对青海省不同地区唐古特铁线莲中芦丁进行了定量分析,测定结果:不同产地该药材中芦丁的含量有较大差异,含量在0.119%～0.317%之间.     

红茂草注射液对免疫低下小鼠免疫功能的影响

研究红茂草注射液对小鼠实验性免疫功能低下的影响.以地塞米松(DEX,0.8 mg/kg)造成免疫功能低下的动物模型,用3个不同质量分数的红茂草注射液(50,100,200 mg/(kg·d)×4 d)分别予以治疗后,采用碳粒廓清法、溶血素测定法、器官指数测定等有关免疫指标.红茂草注射液可使小鼠的廓清指数K值、吞噬指数α值、器官指数、血清溶血素及溶菌酶活力增高,尤以100 mg/kg剂量组效果显著.红茂草注射液对实验性免疫功能低下小鼠有明显的免疫增强作用,这为其应用于临床治疗提供了一定的实验依据.     

Enhancement of light trapping in thin-film solar cells through Ag

Forward-scattering efficiency (FSE) is first proposed when an Ag nanoparticle serves as the light-trapping structure for thin-film (TF) solar cells because the Ag nanoparticle’s light-trapping efficiency lies on the light-scattering direction of metal nanoparticles.Based on FSE analysis of Ag nanoparticles with radii of 53 and 88 nm,the forward-scattering spectra and light-trapping efficiencies are calculated.The contributions of dipole and quadrupole modes to light-trapping effect are also analyzed quantitatively.When the surface coverage of Ag nanoparticles is 5%,light-trapping efficiencies are 15.5% and 32.3%,respectively,for 53and 88-nm Ag nanoparticles.Results indicate that the plasmon quadrupole mode resonance of Ag nanoparticles could further enhance the light-trapping effect for TF solar cells.