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锰铁合金中氧氮含量联合测定方法应用实践 被引量:1
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作者 张作录 《宽厚板》 2022年第5期30-32,共3页
针对应用Leco公司ONH836脉冲加热惰气熔融热导法同时测定锰铁合金中氧、氮的分析条件展开试验研究。结果表明,助熔剂与样品质量比3∶1~10∶1时熔渣分布均匀。氧、氮同时测定时脱气功率为5.5 kW,分析功率为5.0 kW,分析积分时间分别为40 s... 针对应用Leco公司ONH836脉冲加热惰气熔融热导法同时测定锰铁合金中氧、氮的分析条件展开试验研究。结果表明,助熔剂与样品质量比3∶1~10∶1时熔渣分布均匀。氧、氮同时测定时脱气功率为5.5 kW,分析功率为5.0 kW,分析积分时间分别为40 s、60 s时结果稳定。在优化条件下建立的氧、氮校正曲线线性好,相关系数大于0.999;分析样品的相对标准偏差均小于5%。本方法简便、快速、准确,在实际生产分析中取得了良好的效果。 展开更多
关键词 脉冲加热惰气熔融热导法 锰铁合金 氧氮联合测定
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LECO TCH600型氧氮氢联合测定仪分析钢中氧、氮 被引量:6
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作者 揭森林 刘向阳 左新建 《柳钢科技》 2013年第4期24-26,47,共4页
介绍应用LECO TCH600氧氮氢联合测定仪测定钢中氧、氮时,样品制备对分析结果的影响,对分析参数的优化,钢中固溶氮分量的测定等。
关键词 LECO TCH600联合测定
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ONH-2000对钛及钛合金中氧、氮的联合测定
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作者 陶虹 《昆钢科技》 2016年第3期50-52,共3页
使用德国ELTRA公司的ONH-2000联合测定仪,建立了脉冲惰性气熔化法测定钛及钛合金中氧、氮的分析方法。采用石墨套坩埚,以镍篮做助熔剂,确立了最佳实验条件:对于0.10~0.13g试样,镍篮助熔剂的用量为1g,分析功率为0.55kW。氧、... 使用德国ELTRA公司的ONH-2000联合测定仪,建立了脉冲惰性气熔化法测定钛及钛合金中氧、氮的分析方法。采用石墨套坩埚,以镍篮做助熔剂,确立了最佳实验条件:对于0.10~0.13g试样,镍篮助熔剂的用量为1g,分析功率为0.55kW。氧、氮的线性范围分别为0.0001%-0.1%、0.0001%-0.01%(质量分数),方法检出限分别为0.000045%、0.000061%(质量分数)。采用本实验方法测定钛合金实际样品中氧、氮的测定结果与国家标准方法(GB/T4698.7—2011和GB/T4698.15—2011)的测定结果基本一致,在最佳测定条件(排气功率5.5kW,分析功率5.0kW,加热提取时氧35s,氮65s),对标准样品进行测定,结果良好。为钛及钛合金中氧、氮的同时测定提供了一条有效途径。 展开更多
关键词 惰性气熔化法 联合测定
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Xinfeng capsule improves pulmonary function in ankylosing spondylitis patients via NF-κB-iNOS-NO signaling pathway 被引量:26
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作者 Jian Liu Yajun Qi +4 位作者 Li Zheng Yunxiang Cao Lei Wan Wenfang Ye Li Fang 《Journal of Traditional Chinese Medicine》 SCIE CAS CSCD 2014年第6期657-665,共9页
OBJECTIVE: To study changes in the nuclear factor-κB p65(NF-κB p65)-inducible nitric oxide synthase(i NOS)-nitric oxide(NO) signaling pathway and the effects of Xinfeng capsules(XFC) in patients with ankylosing spon... OBJECTIVE: To study changes in the nuclear factor-κB p65(NF-κB p65)-inducible nitric oxide synthase(i NOS)-nitric oxide(NO) signaling pathway and the effects of Xinfeng capsules(XFC) in patients with ankylosing spondylitis(AS)METHODS: One hundred twenty patients with AS were randomly divided into an XFC group and a Salazopyrin group. Sixty health subjects were included as a normal control group. In the two treatment groups, pulmonary functional parameters,forced vital capacity(FVC), forced expiratory volume in 1 second(FEV1), maximal voluntary ventilation(MVV), peak expiratory flow(PEF), forced expiratory flow at 25% of forced vital capacity(FEF25),forced expiratory flow at 50% of forced vital capacity(FEF50), and forced expiratory flow at 75% of forced vital capacity(FEF75) were determined. Enzyme linked immunosorbent assays were used for detection of the serum oxidative stress indexes,NF-κB p65, i NOS, NO, reactive oxygen species(ROS), reactive nitrogen species(RNS), malondialdehyde(MDA), superoxide dismutase(SOD), catalase(CAT), total antioxidative capacity(TAOC) and interleukin-4(IL-4), IL-10, IL-1β, and tumor necrosis factor-α(TNF-α) contents. Westergren's method was used for determination of erythrocyte sedimentation rate(ESR). High-sensitivity C-reactive protein(Hs-CRP) was detected with a 7060 full-automatic biochemical analyzer(Hitachi, Japan).RESULTS: The clinical therapeutic effect in the XFC group was significantly superior to that in the Salazopyrin group(P<0.01). Compared with the normal control group, FEV1, MVV, PEF, FEF50, FEF75, SOD, CAT,TAOC, IL-4, IL-10 were significantly lower, and NF-κB p65, i NOS, NO, ROS, RNS, MDA, IL-1β, TNF-α, ESR,and Hs-CRP significantly higher in patients with AS(P<0.01 or P<0.05). Compared with before treatment, FEV1, MVV, PEF, FEF50, FEF75, SOD, CAT, TAOC,IL-4, and IL-10 were significantly increased, and NF-κB p65, i NOS, NO, ROS, RNS, MDA, IL-1β, TNF-α,ESR, CRP, visual analog scales(VAS), Bath ankylosing spondylitis disease active index, Bath ankylosing spondylitis functional index, and Bath ankylosing spondylitis global index significantly decreased in the two treatment groups after treatment(P<0.01 or P<0.05), with significant differences between the XFC and Salazopyrin groups(P<0.01 or P<0.05). Spearman correlation analysis indicated that FEV1, MVV, PEF, FEF50, and FEF75 were positively correlated with SOD, CAT, TAOC, IL-4, and IL-10, and were negatively correlated with NF-κB p65, i NOS,NO, ROS, RNS, MDA, IL-1β, TNF-α, ESR, and CRP.CONCLUSION: Patients with AS have local pathologic changes in the spinal cord and other joints.They also have decreased pulmonary function,which is negatively correlated with the NF-κB-i NOS-NO signaling pathway, oxidative indexes, and inflammatory factors. XFC improves rigidity and pain in spinal joints and other symptoms, laboratory indexes, and pulmonary function. The mechanism is possibly related to inhibition of the NF-κB-i NOS-NO signaling pathway. 展开更多
关键词 Spondylitis ankylosing Respiratoryfunction tests NF-kappa B Nitric oxide synthase Nitric oxide Xinfeng capsule
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