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Corrosion Inhibition of SiCp/5A06 Aluminum Metal Matrix Composite by Cerium Conversion Treatment

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Chinese Journal of Aeronautics 2009年第6期22卷 670-676页

作者： Irfan Aziz Zhang qi Xiang min School of Materials Science and Engineering Beo'ing University of Aeronautics and Astronautics Beijing 100191 China

This article studies the effects of the CeCl3 concentrations in conversion solutions with and without addition of NaCl, pH-values of conversion solution, drying temperature, time and temperature of immersion on the Ce-conversion coatings for corrosion protection of the SiCp/5A06 Al-MMC and 5A06 Al-alloy in the 3.5% NaCl aqueous solution at room temperature. Potentiodynamic polarization tests reveal that the Ce-conversion treatment could markedly improve the pitting corrosion resistance of the composite and the matrix alloy in chloride containing environment. The best corrosion resistance effects are obtained for the samples treatment in 1% CeCl3.7H2O/3.5% NaCl solution at 45℃ for 60 min, followed by drying at 100 ℃ for 30 min. Examinations by means of scanning electron microscopy （SEM）, energy dispersion spectroscopy （EDS） and X-ray photoelectron spectroscopy （XPS） indicate that this behavior is due to the precipitation of Ce-oxides/hydroxides on the cathodic intermetallics and the Al-oxide film on the rest of the metal matrix.

关键词： cerium thermal coatings SiCp/5A06 Al matrix composites potentiodynamic polarization alkaline corrosion

Crystallization behavior of Fe_(78)Si_(13)B_9 metallic glass under high magnetic field

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Journal of University of Science and Technology Beijing 2008年第5期15卷 600-604页

作者： Yuanfei Yu Baozhu Liu min qi School of Materials Science and Engineering Dialian University of Technology Dialian 116024 China

The effects of high magnetic field on the crystallization behavior of the Fe78Si13B9 metallic glass ribbon were studied. The samples were isothermal annealed for 30 min under high magnetic field and no field,respectively. Microstructure transformation during crystallization was identified by X-ray diffraction and transmission electron microscopy. It was found that the crystallizations of Fe78Si13B9 metallic glass processed under different conditions were that the precipitation of dendrite α-Fe（Si） and spherulite （Fe,Si）3B phases forms amorphous matrix and then the metastable （Fe,Si）3B phase transforms into the stable Fe2B phase. The grain size of the crystals is smaller and more homogeneous for the isothermal annealed samples under high magnetic field in comparison with that under no field indicating that the crystallization behavior of Fe78Si13B9 metallic glass is suppressed by high magnetic field.

关键词： metallic glass high magnetic field isothermal annealing crystallization behavior

Effects of telbivudine and entecavir for HBeAg-positive chronic hepatitis B: A meta-analysis

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World Journal of Gastroenterology 2012年第43期18卷 6290-6301页

作者： qi-min Su Xiao-Guang Ye Department of Infectious Diseases the Second Affiliated Hospital of Guangzhou Medical UniversityGuangzhou 510260Guangdong ProvinceChina

AIM:To compare the effects of telbivudine (LDT) and entecavir (ETV) in treatment of hepatitis B e antigen (HBeAg)-positive chronic hepatitis B by meta-analysis. METHODS:We conducted a literature search using PubMed, MEDLINE, EMBASE, the China National Knowledge Infrastructure, the VIP database, the Wanfang database and the Cochrane Controlled Trial Register for all relevant articles published before April 1, 2012. Randomized controlled trials (RCTs) comparing LDT with ETV for treatment of HBeAg-positive chronic hepatitis B were included. The data was analyzed with Review Manager Software 5.0. We used relative risk (RR) as an effect measure, and reported its 95% CI. Meta-analysis was performed using either a fixedeffect or random-effect model, based on the absence or presence of significant heterogeneity. Two reviewers assessed the risk of bias and extracted data indepen- dently and in duplicate. The analysis was executed using the main outcome parameters including hepatitis B virus (HBV) DNA undetectability, alanine aminotransferase (ALT) normalization, HBeAg loss, HBeAg seroconversion, drug-resistance, and adverse reactions. Meta-analysis of the included trials and subgroup analyses were conducted to examine the association between pre-specified characteristics with the therapeutic effects of the two agents. RESULTS:Thirteen eligible trials (3925 patients in total) were included and evaluated for methodological quality and heterogeneity. In various treatment durations of 4 wk, 8 wk, 12 wk, 24 wk, 36 wk, 48 wk, 52 wk, 60 wk and 72 wk, the rates of HBV DNA undetectability and ALT normalization in the two groups were similar, without statistical significance. At 4 wk and 8 wk of the treatment, no statistical differences were found in the rate of HBeAg loss between the two groups, while the rate in the LDT group was higher than in the ETV group at 12 wk, 24 wk, 48 wk and 52 wk, respectively (RR 2.28, 95% CI 1.16, 7.03, P = 0.02; RR 1.45, 95% CI 1.16, 1.82, P = 0.001; R

关键词： Telbivudine Entecavir Hepatitis B e antigen-positive chronic hepatitis B Randomized controlled trials Meta-analysis

毛竹PeACO基因家族鉴定及箨鞘剥除后的表达分析

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农业生物技术学报 2025年第1期33卷 55-67页

作者：李其旻兰智鑫朱唯玮李翔宇吴蔼民林新春浙江农林大学省部共建亚热带森林培育国家重点实验室华南农业大学林学与风景园林学院

1-氨基环丙烷-1-羧酸氧化酶(1-aminocyclopropane-1-carboxylate oxidase, ACO)是乙烯合成过程中的关键限速酶之一。本研究以毛竹(Phyllostachys edulis)为材料，对PeACO基因家族进行全基因组鉴定及表达分析，以探究PeACOs在毛竹茎秆木... 详细信息

1-氨基环丙烷-1-羧酸氧化酶(1-aminocyclopropane-1-carboxylate oxidase, ACO)是乙烯合成过程中的关键限速酶之一。本研究以毛竹(Phyllostachys edulis)为材料，对PeACO基因家族进行全基因组鉴定及表达分析，以探究PeACOs在毛竹茎秆木质化进程中的影响。本研究通过与水稻(Oryza sativa) ACO基因序列比对，在毛竹基因组中鉴定得到11条具有完整2OG-FeII＿Oxy结构域的PeACOs序列；理化分析显示，PeACOs基因编码304～445个氨基酸，蛋白分子量为34 105.83～49 417.78 D；进化关系和基因结构分析显示，同一分支的基因对在基因结构和蛋白水平上保持高度的保守性；共线性分析得出ACO基因家族在毛竹中共有6对共线性基因，说明基因组复制事件对PeACOs基因数目扩张有重要影响。基因表达分析显示，PeACOs在毛竹各组织均有表达，尤其在快速生长期的笋中表达丰度最高；剥除处于快速生长期的毛竹箨鞘导致毛竹茎秆木质化程度加深，大部分PeACOs基因的表达量显著上调，且具有相似结构的基因对表达趋势相似，提示PeACO基因家族可能在木质化进程中发挥重要作用。本研究为深入探讨毛竹ACO基因家族功能提供了参考依据。

关键词：毛竹 1-氨基环丙烷-1-羧酸氧化酶(ACO)基因家族表达分析木质化

Controllable time delay using slow/fast light in active fiber ring resonators with gain manipulation

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Science China(Physics,Mechanics & Astronomy) 2013年第6期56卷 1085-1089页

作者： XIAO PingPing HU HongWu qi min College of Physics Science and Engineering Technology Yichun University College of Mathematics and Computer Science Yichun University

We propose to generate controllable time delay using slow/fast light in fiber ring resonators with gain *** dispersion and group delay of active fiber ring resonator can be controlled by manipulating its gain level below the lasing *** of the negative group delay in the undercoupled regime and the positive group delay in the overcoupled regime is theoretically ***,large group delay can be obtained accompanied by signal gain in active ring *** addition,we describe wide bandwidth and large group delay in 4-stage cascaded ring resonators.

关键词： slow and fast light fiber ring resonator loss factor active fiber

Health Effects of Airborne Particulate Matter Trace Elements

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Biomedical and Environmental Sciences 2005年第5期18卷 349-355页

作者： XIANG GAO qi YU LI-min CHEN Department of Environmental Science and Engineering Fudan University Shanghai 200433 China

The effects of airborne particulate matter （PM） trace elements on health are widely concerned nowadays. Many achievements have been made while many unknowns exist. This article reports the recent research progresses, describes the effects of exposure to PM trace elements on health epidemiological evidence, toxicology findings, and raises some questions for future studies.

关键词： Health effect Particulate matter Trace element

On hot deformation behavior and workability characteristic of 42CrMo4 steel based on microstructure and processing map

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Journal of Iron and Steel Research International 2023年第3期30卷 537-547页

作者： min qi Hong-yan Wu Ying Dong Lin-xiu Du State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

In order to determine the safe region of 42CrMo4 steel during hot working and obtain excellent workability,the hot deformation behavior at the temperatures of 850-1150℃and the strain rates of 0.01-10 s^(-1)was investigated through single-pass compression test of *** observing and analyzing the true stress-strain curves,the conclusion may be drawn that the flow stress value increases with the decrease in deformation temperature and the increase in strain *** temperature and reducing strain rate are conductive to dynamic recrystallization(DRX)nucleating and growing,but adiabatic heating caused by higher strain rate can also promote *** the Zener-Hollomon(Z)value and dynamic recrystallized grain size(D_(DRX))have completely opposite trends with deformation condition parameters,the expression of Z value and DDRX can be determined as:D_(DRx)=15,567.645Z^(-02174).The processing map and instability map constructed at a strain of 0.9 show that the suitable window for hot working with a true strain of 0.9 is in the temperature range of 970-1150℃and strain rate range of 0.01-0.25 s^(-1),as well as at the temperature of 1150℃ and strain rate range of 0.25-10 s^(-1).The instability phenomenon appears in the process interval of 850-1096℃ and 0.22-10 s^(-1).

关键词： Hot deformation behavior Dynamic recrystallization Microstructure evolution Constitutive relationship Processing map

Effects of entecavir and lamivudine for hepatitis B decompensated cirrhosis: Meta-analysis

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World Journal of Gastroenterology 2013年第39期19卷 6665-6678页

作者： Xiao-Guang Ye qi-min Su Department of Infectious Diseases the SecondAffiliated Hospital of Guangzhou Medical University

AIM:To compare the effects of entecavir(ETV)and lamivudine(LAM)for the treatment of hepatitis B decompensated cirrhosis using a ***:We conducted a literature search for all eligible studies published prior to May 30,2013 using PUBMED,MEDLINE,EMBASE,the China National Knowledge Infrastructure(CNKI),the VIP database,the Wanfang database and the Cochrane Controlled Trial *** controlled trials(RCTs)comparing ETV with LAM for the treatment of hepatitis B decompensated cirrhosis were *** data were analyzed with Review Manager Software *** used RR as an effect measure,and reported its95%*** meta-analysis was performed using either a fixed-effect or random-effect model,based on the absence or presence of significant *** reviewers assessed the risk of bias and extracted data independently and in *** analysis was executed using the main outcome parameters including hepatitis B virus(HBV)DNA undetectability,HBV DNA level,hepatitis B e antigen(HBeAg)seroconversion,alanine aminotransferase(ALT)level,albumin level,total bilirubin(TBIL)level,prothrombin time activity(PTA)level,Child-Turcotte-Pugh(CTP)score,mortality,drugresistance,and adverse ***-analysis of the included trials and subgroup analyses were conducted to examine the association between pre-specified characteristics and the therapeutic effects of the two ***:Thirteen eligible trials(873 patients in total)were included and evaluated for methodological quality and *** these studies,all had baseline comparability,12 of them reported baseline values of the two treatment groups in *** various treatment durations(12,24,36,48 and>48 wk),both ETV and LAM significantly reduced HBV DNA level,however,reductions were greater in the ETV group(MD=-0.66,95%CI:-0.83-0.50,P<0.00001),(MD=-0.93,95%CI:-1.36-0.51,P<0.0001),(MD=-1.4,95%CI:-1.78-1.01,P<0.00001),(MD=-1.18,95%CI:-1.90-0.46,P=0.001),(MD=-0.14,95%CI:-0.17-0.

关键词： Hepatitis B Decompensated cirrhosis Entecavir Lamivudine Randomized controlled trial Metaanalysis.

Synthesis and characterization of biodegradable aliphatic polyesters using dibutylmagnesium as initiator

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Chinese Chemical Letters 2007年第6期18卷 744-746页

作者： Lian Liu Zhi Yong Wei min qi Electromechanics and Materials Engineering College Dalian Maritime University Dalian 116026 China School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China

Aliphatic polyesters were synthesized via the ring opening polymerization of the corresponding lactones initiated with dibutylmagnesium both in bulk and in solution. The resulting polymers were characterized by 1H, 13C NMR, GPC and XRD. The results indicated that dibutylmagnesium is an effective initiator for the ring opening polymerization of lactones.

关键词： Aliphatic polyesters Lactones Dibutylmagnesium Biodegradable Biomaterials