Uniformity of gallium doped zinc oxide thin film prepared by pulsed laser deposition

Recently, transparent conducting oxide thin films have attracted attention for the application to transparent conducting electrodes. In this work, we evaluated the uniformity of electrical, optical and structural properties for gallium doped zinc oxide thin films prepared on the 10 × 10 cm² silica glass substrate by pulsed laser deposition. The resistivity, carrier concentration, mobility, bonding state and atomic composition of the film were uniform along in-plane and depth direction over the 10 × 10 cm² area of the substrate. The film showed the average transmittance of 81-87%, resistivity of 1.4 × 10^− 3 Ω cm, carrier concentration of 9.7 × 10²⁰/cm³ and mobility of 5 cm²/Vs in spite of the amorphous X-ray diffraction pattern. The gradual thickness distribution was found, however, the potential for large-area and low temperature deposition of transparent conducting oxide thin film using pulsed laser deposition method was confirmed.     

添加物对Fe_2O_3超微粒的稳定作用

粒子的尺寸直接关系着气敏元件性能的好坏．为了防止Ｆｅ２Ｏ３超微粒在气敏元件烧结过程中长大，我们在纯Ｆｅ２Ｏ３中掺入５ｍｏｌ％碱土金属离子，利用ＸＲＤ和ＴＥＭ系统研究了掺杂物对Ｆｅ２Ｏ３超微粒子的稳定作用，并对由掺杂引起的Ｆｅ２Ｏ３电学性质的变化作了初步探讨．     

氧化钇纳米粉体材料的制备

以YCl3为原料 ,以Na2 CO3为添加剂 ,聚乙二醇 4 0 0为分散剂 ,首先制备出晶粒细小的碳酸钇前驱体。在 70 0℃焙烧 1h后制得Y2 O3纳米粉体材料 ,经XRD和TEM检测 ,粒径为 5 0nm ,粒度均匀     

Pulsed Electromagnetic Field (PEMF) Treatment Reduces Lipopolysaccharide-Induced Septic Shock in Mice

Despite advances in medicine, mortality due to sepsis has not decreased. Pulsed electromagnetic field (PEMF) therapy is emerging as an alternative treatment in many inflammation-related diseases. However, there are few studies on the application of PEMF therapy to sepsis. In the current study, we examined the effect of PEMF therapy on a mouse model of lipopolysaccharide (LPS)-induced septic shock. Mice injected with LPS and treated with PEMF showed higher survival rates compared with the LPS group. The increased survival was correlated with decreased levels of pro-inflammatory cytokine mRNA expression and lower serum nitric oxide levels and nitric oxide synthase 2 mRNA expression in the liver compared with the LPS group. In the PEMF + LPS group, there was less organ damage in the liver, lungs, spleen, and kidneys compared to the LPS group. To identify potential gene targets of PEMF treatment, microarray analysis was performed, and the results showed that 136 genes were up-regulated, and 267 genes were down-regulated in the PEMF + LPS group compared to the LPS group. These results suggest that PEMF treatment can dramatically decrease septic shock through the reduction of pro-inflammatory cytokine gene expression. In a clinical setting, PEMF may provide a beneficial effect for patients with bacteria-induced sepsis and reduce septic shock-induced mortality.     

还原剂和水蒸汽对钯催化NO还原反应性能的影响

为满足严格的排放法规,在控制好NOx排放的同时,也需减少N2O、NH3等二次污染物的排放。为探究尾气组分对NOx还原产物的影响,本文用催化活性模拟评价装置,对自制单钯三效催化剂,进行了还原剂种类、CO浓度及水蒸汽浓度对NO转化效率及N2O和NH3生成产物的影响研究。结果表明,CO催化还原NO是导致N2O生成的主要原因,其内在本质在于催化剂表面活性氧物种的协同作用,NH3的生成量在150~400 ℃范围内与反应温度正相关;水蒸汽的加入会促进N2O和NH3的生成,H2O分子在催化剂表面吸附作用抑制了活性氧物种的消耗;增加CO浓度可抑制N2O生成但会促进NH3生成。     

氨基磷酸树脂负载镧化合物杂化吸附剂的制备与性能

制备了水合氧化镧(LaH)并将水合氧化镧负载于氨基磷酸树脂(APAR)上制得杂化吸附剂LaH-APAR,用红外光谱(FT-IR)、热重(TGA)对LaH-APAR的结构和热学性能进行了测试,并研究了pH值、温度对LaH及LaH-APAR吸附氟离子性能的影响。结果表明,La3+与APAR以配位键结合,LaH-APAR吸附剂在300℃以下比较稳定,它与LaH吸附性能基本相同,受pH值影响不大,可以在较宽的pH范围内使用;在pH不变的情况下,LaH-APAR随着温度的升高吸附速率也相应提高,属于温度控制吸附,且为化学吸附。     

钙[Ca(NO3)2和CaO]对茶树氟吸收的影响

通过水培和土壤盆栽试验,研究了Ca对茶树F吸收的影响。结果显示,在含F溶液中添加Ca显著降低茶树对F的吸收。在土壤盆栽试验中也得到了类似结果,在2种土壤F含量条件下,加入Ca(NO3)2后显著降低茶树成熟叶和新梢F含量。同样土壤加入CaO后,显著降低茶树对F的吸收。土壤分析表明加入Ca(NO3)2后并没有显著改变土壤水溶性F含量,而加入CaO后还增加了土壤水溶性F含量。因此,Ca减少F吸收可能并不单纯是因为形成CaF2后降低土壤F的有效性。     

循环函数法在回热系统中的局部定量计算

根据等效焓降法在热力系统计算时的特点,推导了循环函数法在回热系统中的局部定量计算方法,导出了回热系统局部定量计算的几个重要结论.最后,通过实例计算对所得结论进行了验证.验证结果表明,该方法在回热系统局部定量计算过程中具有简洁、准确、概念清晰等特点,适合推广.