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Friction surfacing of AISI 316 over mild steel: A characteriation study

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Defence Technology（防务技术） 2018年第4期14卷 306-312页

作者： R.George Sahaya nixon b.S.Mohanty R.Sathish Department of Mechanical Sathyabama University Department of Mechanical Engineering St.Joseph's College of Engineering Department of Mechanical Engineering SRM Easwari

An attempt has been made with overlaying of stain-less steel on mild steel by the technique of friction surfacing. This investigation elaborates the excellence acquired by different combination of the process parameters used in friction surfacing specifically traverse speed of the cross slide, speed of rotation of the spindle and the uniaxial compressive load. Excellent overlaying has been obtained amongst the chosen materials. To which, the coating can be done with various set of process parameters. It has been observed that the bond strength of the coating was found to be at a maximum of 502 MPa by ram tensile *** upon this results the surface methodology was characterized with scanning electron *** authenticating the results, the coated specimen was subjected to salt spray test. The bonding microstructure was characterized using optical microscopy and X-ray diffraction. Corrosion resistance of surfaced coatings was found to be more inferior to that of mechtrode material and greater with the substrate.

关键词： Friction surfacing Rotational speed Traverse speed Axial load Salt spray test Microstructure XRD analysis Ram tensile test

Seroprevalence of hepatitis b surface antigen in pregnant women attending antenatal clinic in Honiara Solomon Islands,2015

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World Journal of Hepatology 2016年第34期8卷 1521-1528页

作者： Aneley Getahun Margaret baekalia nixon Panda Alice Lee Elliot Puiahi Sabiha Khan Donald Tahani Doris Manongi Department of Public Health and Primary Care College of Medicine Nursing and Health SciencesFiji National University Department of Health and Social Affairs Yap State Hospital School of Nursing and Allied Health Sciences Solomon Islands National University Concord Repatriation General Hospital University of Sydney National Referral Hospital

AIMTo determine the seroprevalence of hepatitis b surface antigen (HbsAg) among pregnant women attending antenatal clinic in Honiara, Solomon Islands. METHODSThis descriptive cross-sectional study was carried out in seven area health centers in Honiara. From March to June 2015, identification of eligible pregnant women in each site was conducted using systematic random sampling technique. A total of 243 pregnant women who gave written informed consent were enrolled. Standardized tool was used to record demographics, obstetric history and serology results. HbsAg and hepatitis b e antigen (HbeAg) were tested using point-of-care rapid diagnostic test. All HbsAg positive samples were verified using enzyme-linked immunosorbent assay. RESULTSThe mean age of participants was 26 ± 6 years. The overall hepatitis HbsAg prevalence was 13.8% with higher rate (22%) reported in women between 30-34 years of age. Majority of HbsAg positive participants were Melanesians (29 out for 33). None of the pregnant women in the 15-19 years and ≥ 40 years tested positive for HbsAg. There was no statistically significant difference in HbsAg prevalence by age, ethnicity, education and residential location. The overall HbeAg seroprevalence was 36.7%. Women between 20-24 years of age had the highest rate of 54.5%. Low level of knowledge about hepatitis b vaccination was reputed. Overall, 54.6% of participants were not aware of their hepatitis b vaccination status and only 65.2% of mothers reported their child had been vaccinated. CONCLUSIONHepatitis b is a disease of public health importance in Solomon Islands and emphasize the need for integrated preventative interventions for its control.

关键词： Hepatitis b Chronic hepatitis Hepatitis b surface antigen Hepatitis b e antigen Seroprevalence Pregnant women Solomon Islands

南极洲万达盐湖中的痕量金属——一个封闭湖盆中痕量金属垂直迁移模式

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中国科学（b辑） 1991年第10期 1100-1110页

作者：于昇松 W.J.Grenn P.A.nixon 中国科学院盐湖研究所西宁810008 美国俄亥俄州迈阿密大学

万达湖(Vanda Lake)位于南极洲赖特谷(Wright Valley),它是一典型的双季回水的CaCl_2型盐湖。本文基于该盐湖水溶液的某些化学和物理性质,阐述了湖水中的痕量金属Fe,Mn,Pb,Cr,Cu,Co,Ni和Cd浓度随水深变化的垂直地球化学分布,讨论了湖水... 详细信息

万达湖(Vanda Lake)位于南极洲赖特谷(Wright Valley),它是一典型的双季回水的CaCl_2型盐湖。本文基于该盐湖水溶液的某些化学和物理性质,阐述了湖水中的痕量金属Fe,Mn,Pb,Cr,Cu,Co,Ni和Cd浓度随水深变化的垂直地球化学分布,讨论了湖水中的这些痕量金属的垂直迁移作用,并试图建立一封闭的氯化物型盐湖水中痕量金属垂直迁移模式。

关键词：南极洲痕量金属离子活度积

二维应变和应变率成像技术监测心脏移植术后急性排异反应

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中国医学影像技术 2009年第7期25卷 1179-1182页

作者：何怡华李治安谷孝艳 nixon J V(Ian) 首都医科大学附属北京安贞医院超声诊断科北京100029 弗吉尼亚联邦大学心脏内科里士满23298

目的探讨超声心动图二维应变和应变率成像技术在监测心脏移植术后急性排异反应方面的价值。方法对25例心脏移植患者在活检12h内行超声心动图检查。急性排异反应0级为A组(n=10),急性排异反应Ⅰa～Ⅰb级为b组(n=8),急性排异反应≥Ⅱ级为C... 详细信息

目的探讨超声心动图二维应变和应变率成像技术在监测心脏移植术后急性排异反应方面的价值。方法对25例心脏移植患者在活检12h内行超声心动图检查。急性排异反应0级为A组(n=10),急性排异反应Ⅰa～Ⅰb级为b组(n=8),急性排异反应≥Ⅱ级为C组(n=7)。正常对照组为D组(n=30)。应用二维应变和应变率成像测量收缩期各室壁纵向、径向及环向应变及应变率。对各数据进行组间比较,并进行统计学分析。结果二维应变应变率分析:A、b、C组与D组比较:室间隔基底段收缩期纵向应变、二尖瓣水平前间隔环向应变率、二尖瓣水平所有节段的径向应变均明显减低(P<0.05)。结论二维应变和应变率成像技术的径向应变能早期、敏感地反映出≥Ⅱ级心脏移植急性排异反应患者的心脏收缩功能变化,可以作为心脏移植术后急性排异反应的筛查指标。

关键词：超声心动描记术应变应变率心脏移植急性排异反应

经食管超声心动图检测主动脉粥样硬化斑块与冠状动脉病变严重程度的相关性研究

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中华超声影像学杂志 2009年第10期18卷 832-835页

作者：何怡华李治安谷孝艳 J.V.(Ian)nixon 首都医科大学附属北京安贞医院超声诊断科北京100029 Pauley Heart Center Virginia Commonwealth UniversityUSA

目的通过经食管超声心动图检测主动脉的不同部位不同斑块性质与冠状动脉血管病变严重程度进行对比研究，寻找冠状动脉病变严重程度的预测因素。方法对118例同时进行了经食管超声心动图及冠状动脉造影检查的患者进行对比研究。冠状动脉... 详细信息

目的通过经食管超声心动图检测主动脉的不同部位不同斑块性质与冠状动脉血管病变严重程度进行对比研究，寻找冠状动脉病变严重程度的预测因素。方法对118例同时进行了经食管超声心动图及冠状动脉造影检查的患者进行对比研究。冠状动脉造影显示血管内径狭窄≥70％定义为冠状动脉病变。粥样硬化斑块厚度大于4mm，有漂浮物形成或斑块溃疡定义为复杂斑块；其他大于2mm并小于4mm的斑块定义为简单斑块。根据冠状动脉病变支数将研究对象分为4组：A组（0支病变）99例，b组（1支病变）31例，C组（2支病变）8例，D组（3支病变）30例，比较各组间粥样硬化斑块的发生部位及程度特征。结果与A组0支病变的99例相比，有血管狭窄的89例患者（包括b，C，D组）的主动脉内粥样斑块的发生率、严重度均明显增高（P〈0．05）。多元回归分析显示高血压（优势比3．0，95％可信区间1．3～7．0，P=0．013）、糖尿病（优势比2．4，95％可信区间1．1～4．9，P=0．022）及主动脉斑块（优势比3．8，95％可信区间1．8～8．2，P=0．001）与冠状动脉病变发生明显相关。简单及复杂斑块均与冠状动脉病变严重度明显相关（P〈0．001）。多元回归分析显示主动脉降部复杂斑块是冠状动脉病变的最强预测因子（优势比5．4，95％可信区间1．8～16．4，P=0．003）。结论主动脉内简单及复杂粥样斑块均与冠状动脉病变严重度明显相关。降主动脉复杂斑块是冠状动脉病变的最强预测因子。

关键词：超声心动描记术经食管主动脉动脉粥样硬化冠状动脉疾病

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用异丙苯法生产苯酚的安全问题

齐鲁石油化工 1980年第3期 49-54页

作者： J.b.Fleming J.R.Lambrix J.R.nixon 守钟永建

目前世界上约有一半以上的苯酚装置是采用Hercules—bP方法。其生产能力每年超过170万吨。在用异丙苯法生产苯酚的过程中,由于处理的是易燃易爆物质,因此要求生产装置应具备有效的安全措施。由Hercules和Kellogg公司设计的苯酚装置,达... 详细信息

目前世界上约有一半以上的苯酚装置是采用Hercules—bP方法。其生产能力每年超过170万吨。在用异丙苯法生产苯酚的过程中,由于处理的是易燃易爆物质,因此要求生产装置应具备有效的安全措施。由Hercules和Kellogg公司设计的苯酚装置,达到了很好的安全记录,说明所用的安全措施是较成功的。这篇译文介绍了这些措施的细节,供有关方面参考。

关键词：苯酚装置石炭酸一元酚分解器过氧化氢异丙苯异丙苯法 CHP 氧化器