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Erosion–corrosion behavior of austenitic cast iron in an acidic slurry medium

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International Journal of Minerals,Metallurgy and Materials 2015年第6期22卷 598-603页

作者： Ke Yang Lan Sun Yu-zhen Liu hong-yuan fan School of Mechanical Engineering and Automation Xihua University School of Manufacturing Science and Engineering Sichuan University

A series of austenitic cast iron samples with different compositions were cast and a part of nickel in the samples was replaced by manganese for economic reason. Erosion–corrosion tests were conducted under 2wt% sulfuric acid and 15wt% quartz sand. The results show that the matrix of cast irons remains austenite after a portion of nickel is replaced with manganese.（Fe,Cr）3C is a common phase in the cast irons, and nickel is the main alloying element in high-nickel cast iron; whereas,（Fe,Mn）3C is observed with the increased manganese content in low-nickel cast iron. Under erosion–corrosion tests, the weight-loss rates of the cast irons increase with increasing time. Wear plays a more important role than corrosion in determining the weight loss. It is indicated that the processes of weight loss for the cast irons with high and low nickel contents are different. The erosion resistance of the cast iron containing 7.29wt% nickel and 6.94wt% manganese is equivalent to that of the cast iron containing 13.29wt% nickel.

关键词： cast irons erosion corrosion weight loss acidic environment

Effect of aging temperature on the microstructures and mechanical properties of ZG12Cr9Mo1Co1NiVNbNB ferritic heat-resistant steel

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International Journal of Minerals,Metallurgy and Materials 2016年第2期23卷 168-175页

作者： Xue Yang Lan Sun Ji Xiong Ping Zhou hong-yuan fan Jian-yong Liu School of Manufacturing Science and Engineering Sichuan UniversityChengdu 610065China Dong fang Steam Turbine Works Deyang 618000China

The effect of aging on the mechanical properties and microstructures of a new ZG12Cr9 MolColNiVNbNB ferritic heat resistant steel was investigated in this work to satisfy the high steam parameters of the ultra-supercritical power *** results show that the main precipitates during aging are Fe（Cr,Mo）23C6,V（Nb）C,and（Fe2Mo） Laves in the *** amounts of the precipitated phases increase during aging,and correspondingly,the morphologies of phases are similar to be ***（Cr,Mo）23C6 appears along boundaries and grows with increasing *** addition,it is revealed that the martensitic laths are coarsened and eventually happen to be *** hardness and strength decrease gradually,whereas the plasticity of the steel ***＇s more,the hardness of this steel after creep is similar to that of other 9%-12%Cr ferritic ***,ZG12Cr9 MolColNiVNbNB can be used in the project.

关键词： heat resistant steel aging temperature precipitates microstructure mechanical properties

Preparation and photocatalytic properties of ilmenite NiTiO_3 powders for degradation of humic acid in water

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International Journal of Minerals,Metallurgy and Materials 2012年第4期19卷 372-376页

作者： Pei-hong yuan Cai-mei fan Guang-yue Ding Yun-fang Wang Xiao-chao Zhang Institute of Clean Technique for Chemical Engineering Taiyuan University of Technology Taiyuan 030024 China

The powders of ilmenite structure NiTiO3 were prepared by a modified Pechini process using tetrabutyl titanate and nickel acetate as raw materials, and using citric acid and ethanol as a chelating agent and a solvent respectively. The powder samples were characterized by thermogravimetric and differential thermal analysis （TG-DTA） and X-ray diffraction （XRD）. The photocatalytic activity of NiTiO3 under the irradiation of ultraviolet rays （UV） light was evaluated by degrading hurnic acid （HA） in water as a probe reaction. The possible photodegra- dation mechanism was studied by the examination of active species .OH, .O2, and holes （h＋） through adding scavengers. The TG-DTA and XRD results indicated that the good crystal structure of ilmenite phase NiTiO3 could be obtained when the Ni-Ti citrate complex was cal- cined at 600℃. The photocatalytic activity experiments indicated that NiTiO3 had favourable photocatalytic activity under the irradiation of UV light, and the photocatalytic degradation rate of HA reached 95.3% after a 2.5 h reaction with the photocatalyst calcined at 600℃ and a photocatalyst dosage of 0.4 g/L. The possible photocatalytic mechanism was deduced that holes （h＋） and .OH radicals are the major reactive active species in the photocatalytic reaction, and dissolved oxygen plays a weak role in the degradation of HA.

关键词： photocatalysis nickel titanate degradation humic acid water treatment

Prevalence of abnormal glycometabolism in patients with chronic hepatitis C and related risk factors in China

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Chinese Medical Journal 2011年第2期124卷 183-188页

作者： WANG Li-fen WU Chi-hong SHAN yuan fan Xiao-hong HUO Na LU Hai-ying XU Xiao-yuan Department of Infectious Diseases Peking University First Hospital Beijing 100034 China

Background An epidemiologic link between hepatitis C virus （HCV） and abnormal glycometabolism had been *** study was designed to investigate the prevalence of type 2 diabetes rnellitus and insulin resistance,and to explore the relation between insulin resistance and hepatitis C virus genotype,serum hepatitis C virus-RNA level in chronic hepatitis C（CHC） *** Three hundred and fifty-nine consecutive patients （CHC,n=296;chronic hepatitis B （CHB）,n=63） were *** genotyping was performed by restriction fragment method and serum hepatitis C virus-RNA quantified PCR for all CHC patients in the baseline *** levels of insulin and glucose were measured in all patients and the homeostatic assessment of insulin resistance was calculated in the baseline *** Type 2 diabetes mellitus was diagnosed in 15.5% of 296 CHC *** resistance was present in 23.8% of the 235 nondiabetic CHC patients,in 23.1% of the 182 nondiabetic and noncirrhotic CHC patients,and associated with high serum HCV RNA level （OR： 1.754;95% CI：1.207-2.548,P=0.003） and age 〉40 years （OR.3.542;95% CI：1.257-9.978,P=0.017）.Insulin resistance was less frequent in CHB than in matched CHC （7.9% vs.21.4%respectively,P 〈0.0001）.Conclusion The incidence of insulin resistance in CHC was significantly higher than that in CHB patients,associated with high serum HCV RNA level and age 〉40 years.

关键词： insulin resistance hepatitis C rapid virologic response

甲氰菊酯降解菌Sphingomonas ***4-5对污染土壤的生物修复

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环境科学 2007年第5期28卷 1121-1125页

作者：洪源范洪青沈雨佳李顺鹏南京农业大学生命科学学院农业部农业环境微生物工程重点开放实验室南京210095

JQL4-5(Sphingomonassp.)是1株从长期受农药污染土壤中分离的甲氰菊酯降解菌,考察了其在实验室模拟条件下对甲氰菊酯污染土壤的生物修复能力及其影响因素.结果表明,降解菌株在灭菌土壤中的降解效果要略好于未灭菌土壤,在土壤外源添加降... 详细信息

JQL4-5(Sphingomonassp.)是1株从长期受农药污染土壤中分离的甲氰菊酯降解菌,考察了其在实验室模拟条件下对甲氰菊酯污染土壤的生物修复能力及其影响因素.结果表明,降解菌株在灭菌土壤中的降解效果要略好于未灭菌土壤,在土壤外源添加降解菌106CFU.g-1,温度20-40℃,pH为6.5-7.5的条件下,该菌株能有效降解土壤中10-200 ***-1的甲氰菊酯.可以将其应用于甲氰菊酯污染土壤的生物修复.

关键词：甲氰菊酯降解菌JQIA-5 生物修复

降解菌CDS-1产呋喃丹水解酶的条件及酶学特征

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中国环境科学 2006年第2期26卷 210-213页

作者：徐剑宏洪青严秋香洪源范李顺鹏南京农业大学生命科学学院农业部农业环境微生物工程重点开放实验室江苏南京210095

Sphingomonas ***-1是一株呋喃丹高效降解菌．为了给利用该菌产生的酶去除环境中的呋喃丹残留提供一些理论依据，对CDS-1产生的呋喃丹水解酶粗酶进行了研究．结果表明，在LB培养基中。CDS-1产生呋喃丹水解酶的晟适条件为pa6～8、30℃、... 详细信息

Sphingomonas ***-1是一株呋喃丹高效降解菌．为了给利用该菌产生的酶去除环境中的呋喃丹残留提供一些理论依据，对CDS-1产生的呋喃丹水解酶粗酶进行了研究．结果表明，在LB培养基中。CDS-1产生呋喃丹水解酶的晟适条件为pa6～8、30℃、培养30h；该酶在20—30℃、pH〉6．0的条件下比较稳定：在pH6．5和30℃时显示最大的呋喃丹水解酶活性；大多数金属离子浓度在0.2mmol／L时对其酶活有促进作用：酶定域实验结果显示该酶为胞内酶．

关键词：呋喃丹酶促降解酶活酶的定域

辛硫磷降解菌XSP-1的分离、鉴定及其降解特性研究

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环境科学 2007年第12期28卷 2833-2837页

作者：沈雨佳洪源范洪青蒋新李顺鹏南京农业大学生命科学学院农业部农业环境微生物工程重点开放实验室南京210095 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室南京210008

从农药厂污泥中分离到1株能以辛硫磷为唯一碳源生长的细菌,命名为XSP-1.根据其生理生化特征和16S rRNA基因序列相似性分析,将该菌株初步鉴定为戴尔福特菌属(Delftiasp.).该菌株能在7 h内完全降解100 mg/L的辛硫磷.XSP-1降解辛硫磷的最... 详细信息

从农药厂污泥中分离到1株能以辛硫磷为唯一碳源生长的细菌,命名为XSP-1.根据其生理生化特征和16S rRNA基因序列相似性分析,将该菌株初步鉴定为戴尔福特菌属(Delftiasp.).该菌株能在7 h内完全降解100 mg/L的辛硫磷.XSP-1降解辛硫磷的最适pH为7.0,最适温度为35℃,降解速率与初始接种量呈正相关,该菌株对甲基对硫磷、毒死蜱、杀螟硫磷也有较好的降解能力.根据已报道有机磷农药降解基因mpd的保守序列设计引物,未从该菌株中扩增到目标条带,但是该菌株是否带有新的有机磷农药降解基因仍需要进一步研究.

关键词：辛硫磷生物降解戴尔福特菌属 XSP-1

遗传稳定型六六六、甲基对硫磷降解基因工程菌的构建及特性研究

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环境科学 2008年第7期29卷 1973-1976页

作者：陆鹏洪源范洪青蒋新李顺鹏南京农业大学生命科学学院农业部农业环境微生物工程重点开放实验室南京210095 中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室南京210008

通过转座子介导同源重组的方法,将甲基对硫磷水解酶基因mpd导入到六六六降解菌BHC-A的染色体上,构建了能同时降解六六六和甲基对硫磷的基因工程菌BHC-A-mpd.对其生长特性和降解特性的研究表明,工程菌在LB培养基中的生长特性与原始菌株... 详细信息

通过转座子介导同源重组的方法,将甲基对硫磷水解酶基因mpd导入到六六六降解菌BHC-A的染色体上,构建了能同时降解六六六和甲基对硫磷的基因工程菌BHC-A-mpd.对其生长特性和降解特性的研究表明,工程菌在LB培养基中的生长特性与原始菌株没有差别,生长至对数期A600 nm值都可达到2.5;对六六六的降解特性和原始菌株相同,可在10 h内将5 mg/L的六六六完全降解.mpd基因在BHC-A-mpd中稳定表达,BHC-A-mpd可以降解多种有机磷类农药.该基因工程菌的构建为六六六和甲基对硫磷复合污染环境的生物修复奠定了基础.

关键词：六六六甲基对硫磷生物降解基因工程菌

甲氰菊酯降解菌JQL4-5的分离鉴定及降解特性研究

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环境科学 2006年第10期27卷 2100-2104页

作者：洪源范洪青武俊张忠辉李顺鹏南京农业大学生命科学学院农业部农业环境微生物工程重点开放实验室南京210095

从农药厂废水处理池的活性污泥中分离到1株能以甲氰菊酯为唯一碳源生长的细菌,命名为JQL4-5.根据其生理生化特征和16S rDNA(GenBank Accession ***177525)序列相似性分析,将该菌株鉴定为鞘氨醇单胞菌属(Sphingomonassp.).该菌株在24h内... 详细信息

从农药厂废水处理池的活性污泥中分离到1株能以甲氰菊酯为唯一碳源生长的细菌,命名为JQL4-5.根据其生理生化特征和16S rDNA(GenBank Accession ***177525)序列相似性分析,将该菌株鉴定为鞘氨醇单胞菌属(Sphingomonassp.).该菌株在24h内对20 mg/L的甲氰菊酯的降解率达到99.8%.降解甲氰菊酯的最适温度为30℃,pH为7.0,降解速率与初始接种量呈正相关.酶的定域试验表明,降解甲氰菊酯的酶为胞内酶.

关键词：甲氰菊酯生物降解鞘氨醇单胞菌JQL4—5 酶的定域