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Effects of Anodic Voltages on Microstructure and Properties of Plasma Electrolytic Oxidation Coatings on Biomedical NiTi Alloy

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Journal of Materials Science & Technology 2013年第1期29卷 22-28页

作者： jilin xu Fu Liu Junming Luo Liancheng Zhao School of Materials Science and Engineering Nanchang Hangkong University School of Materials Science and Engineering Harbin Institute of Technology

Plasma electrolytic oxidation （PEO） coatings, formed under various anodic voltages （320-440 V） on biomedical NiTi alloy, are mainly composed of γ-AI203 crystal phase. The evolution of discharging sparks during the PEO process under different anodic voltages was observed. The surface and cross-sectional morphologies, composition, bonding strength, wear resistance and corrosion resistance of the coatings were investigated by scanning electron microscopy （SEM）, thin-film X-ray diffraction （TF-XRD）, energy dispersive X-ray spectrometry （EDS）, surface roughness, direct pull-off test, ball-on-disk friction and wear test and potentiodynamic polarization test, respectively. The results showed that the evolution of discharging sparks during the PEO process directly influenced the microstructure of the PEO coatings and further influences the properties. When the anodic voltage increased from 320 V to 400 V, the corrosion resistance and wear resistance of the coatings slowly increased, and all the bonding strength was higher than 60 MPa; further increasing the anodic voltages, especially up to 440 V, although the thickness and γ-AI203 crystallinity of the coatings further increased, the microstructure and properties of the coatings were obviously deteriorated.

关键词： Plasma electrolytic oxidation Biomedical NiTi alloy AI203 coating Anodic voltage

The Urban “Cultural Nexus of Power”： Intellectual Elites in Shanghai and Beijing, 1900-1937

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Frontiers of History in China 2014年第1期9卷 32-55页

作者： jilin xu Department Of History East China Normal University Shanghai 200241 China

In the decades before the full-scale war with Japan in 1937, a robust series of institutions connected the bourgeois with intellectuals （which included professionals and journalists, as well as academics） in Shanghai. Collectively, these institutions can be understood as forming an urban ＂cultural nexus of power＂ that allowed non-state actors to effectively control aspects of Shanghai＇s political life. This bourgeois-intellectual alliance was not inevitable; no similar bonds existed between these same two groups in Beijing. It was forged in Shanghai due to the city＇s unique historical position as a Treaty Port and its dynamic economy, which included an extensive structure of private higher education and a market-based publishing industry. Unlike the rural ＂cultural nexus of power＂ originally described by Prasenjit Duara, this urban nexus grew stronger during the political and economic changes of the early twentieth century. War and revolution in the 1930s and 1940s, however, destroyed the connections between the bourgeoisie and the intellectuals, ending the vibrant urban environment they had created.

关键词： urban history intellectuals bourgeois culture cultural nexus of power,Shanghai

The Public Sphere in Modern China:Forms,Functions and Self-Understandings--A Case Study of Shanghai

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Fudan Journal of the Humanities and Social Sciences 2020年第3期13卷 413-435页

作者： jilin xu Department of History East China Normal UniversityShanghai 200062China

Using the case of Shanghai,this article,by starting with a discussion of the historical evolution of political legitimacy in China,analyzes the public sphere in Modern China and its native ideological origin,historical forms and functions in public opinion,and probes into its universality and particularity through a comparison with Jurgen Habermas's notion of the public sphere.

关键词： Public sphere Public opinion Political legitimacy Shiwu Bao Modern Shanghai

Seawater Corrosion Fatigue of Welded Joints Under Random Variable Amplitude Loading

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China Ocean Engineering 1993年第2期8卷 139-146页

作者： xue, Yinian xu, jilin Li, Yanping Li, He Chinese Acad of Sciences Beijing China

Offshore platforms are always subjected to wave action which is random variable amplitude cyclic loading. In order to simulate the stressing condition at the 'hot spot' of the tubular joints and the marine environment, random variable amplitude fatigue tests have been carried out on welded plate joints in sea water. The tests have been conducted under the conditions of loading frequency of 0.2 Hz/, stress ratio of -1, seawater temperature of about 20°C and cathodic protection with the potential about -850 mV, SCE. The test results have been compared with the seawater corrosion fatigue life under constant amplitude loading. Miner's linear cumulative damage summation rule has been used to predict the corrosion fatigue life under variable amplitude loading. The predicted life is in good agreement with the test data.

关键词： Cathodic protection Corrosion fatigue Failure (mechanical) Fatigue testing Joints (structural components) Offshore structures Production platforms Seawater Stresses Structural loads Water waves Welds

INFLUENCE OF PLATE THICKNESS ON FATIGUE BEHAVIOUR OF WELDED JOINTS IN AIR AND IN SEA WATER

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China Ocean Engineering 1990年第2期5卷 179-188页

作者： xue, Yinian xu, jilin Li, He Li, Yanping Chinese Acad of Sciences Beijing China

Bending fatigue tests were carried out on cruciform welded joints of China-made platform steel E36-Z35 with plate thickness of 16mm, 32mm and 40mm. The tests consisted of testing in air and in sea water with and without cathodic protection (-850mV. SCE). The sea water corrosion fatigue tests were conducted at loading frequency of 0.2 Hz and sea water temperature of 20°C. The test results show an obvious reduction in fatigue strength of welded joints with increasing plate thickness in all the three test conditions. The present paper proposes different thickness corrections for fatigue strength and fatigue life of welded joints in air and in sea water with and without cathodic protection respectively. In addition, an explanation for thickness effect on fatigue life of welded joints is given by using the theory of fracture mechanics.

关键词： Metals and Alloys Corrosion Protection Offshore Structures Plates Testing Seawater Corrosive Effects

Optimal Culture Capacity of White Shrimp (Litopenaeus vannamei) and Razor Clam (Sinonovacula constricta) in a New Series-Connection Culture Model

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Journal of Ocean University of China 2022年第6期21卷 1641-1648页

作者： HU Jiabao ZHAO Chunpu BAO Gege LUO Yunhui WANG Danli xu jilin xu Shanliang School of Marine Sciences Ningbo UniversityNingbo 315211China

To construct an effective circular mix-culture model and investigate its culture capacity,we established one small and one large systems,with white shrimp(Litopenaeus vannamei)and razor clam(Sinonovacula constricta)cultured in separate *** culture water from the *** was pumped to the ***,and the culture water from the *** overflowed back into the *** via *** trial I,we tested four culture densities(groups 1–4),and monitored water quality,growth indices,and digestive and immune enzyme *** the results,the nitrogen and phosphorus levels generally increased then declined after 56 days,and were lower in groups 1 and *** specific growth rate of group 2 was the *** 56 days,activities of four digestive enzymes were increased in group 2,and lysozyme activity was significantly decreased in *** in groups 1–4;Alkaline phosphatase activity of *** was increased in group 3,but decreased in *** in groups 2–4;Acid phosphatase activity was significantly higher in groups 1–3(P<0.05),while SOD and CAT activities were significantly elevated in group 2(P<0.05).Thus,we applied group 2 density for trial *** trial II,nitrogen and phosphorus concentrations declined significantly during the latter stages,and growth indices were higher than the control(P<0.05).The yields of *** and *** were significantly higher than the control(P<0.05).The results revealed a good circular mix-culture system with the optimal culture capacity for ***(40 ind m^(−2))and ***(300 ind m^(−2)),which provided a reference for the future culture of them.

关键词： Litopenaeus vannamei Sinonovacula constricta culture capacity series connection culture model water quality

Influence of the Electrode Distance on Microstructure and Corrosion Resistance of Ni-Cr Alloyed Layers Deposited by Double Glow Plasma Surface Metallurgy

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Journal of Wuhan University of Technology(Materials Science) 2022年第6期37卷 1204-1215页

作者： HUANG Jun YANG Siyu CUI Shiyu xu jilin ZHANG Jianping LUO Junming School of Materials Science and Engineering Nanchang Hangkong UniversityNanchang 330063China

Ni-Cr alloyed layers were synthesized on the surface of Q235 mild steel by double-glow plasma surface metallurgy with different electrode *** microstructure and phases of the alloyed layer were characterized by scanning electron microscopy(SEM),energy dispersive X-ray spectrometry(EDS),and X-ray diffraction(XRD).The corrosion behavior of the Ni-Cr alloyed layers both in 3.5%NaCl and 0.5 M H_(2)SO_(4) solution were systematically investigated by open-circuit potential(OCP),potentiodynamic polarization and electrochemical impedance spectroscopy(EIS).The obtained results reveal that the Ni-Cr alloyed layer consists of a deposited layer and an inter-diffusion *** increasing the electrode distance,the relative thickness,microstructure and phase composition of the Ni-Cr alloyed layers vary *** data show the Ni-Cr alloyed layer with the electrode distance of 15 mm has highest corrosion resistance and lowest corrosion rate,while EIS results reveal the same *** highest protective efficiency in 3.5%NaCl and 0.5 M H_(2)SO_(4) solution are 99.23%and 99.92%,respectively,obtained for the Ni-Cr alloyed layer with 15 mm electrode *** the electrode distance is too large,a thin and porosity Ni-Cr alloyed layer,caused by low plasma density and Kirkendall effect,will be obtained,and will decrease the protective efficiency in corrosive medium.

关键词： double glow plasma surface metallurgy Ni-Cr alloyed layer electrode distance corrosion behavior electrochemical impedance spectroscopy

Isolation of Chloroplasts from Marine Microalga Isochrysis galbana Parke for Their Lipid Composition Analysis

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Journal of Ocean University of China 2022年第1期21卷 225-235页

作者： ZHONG Ye LI Yanrong xu jilin CAO Jiayi ZHOU Chengxu YAN Xiaojun Key Laboratory of Applied Marine Biotechnology Ningbo UniversityNingbo 315211China Collaborative Innovation Center for Zhejiang Marine High-Efficiency and Healthy Aquaculture Ningbo UniversityNingbo 315211China Fujian Baozhi Aquatic Science and Technology Co. Ltd.Zhangzhou 363503China Ningbo Institute of Oceanography Ningbo 315211China

Marine microalga Isochrysis galbana is an important feed species with a high nutritional *** from other uni-cellular algae,its cell contains two chloroplasts which are the major sites for lipid ***,we optimized a chloroplast isola-tion approach suitable for the isolation of *** chloroplasts and determined the purity and integrity of the isolated chloroplasts through microscopic observations and enzyme activity *** chloroplast lipids were analyzed with a ultrahigh-performance li-quid chromatography-Q Exactive Orbitrap-mass *** newly developed isolation approach is simple and reliable to isolate chloroplasts with high integrity and *** average yield of intact chloroplasts was 15.3%±0.1%.Glycolipids and acyl-glycerols were the main chloroplast *** accounted for 56.6%of chloroplast ***(DGDG),monogalactosyldiacylglycerol(MGDG)and sulfoquinovosyldiacylglycerol(SQDG)were the main *** fatty acyl R1/R2 were mostly 18:4/16:1,18:3/16:1 and 18:4/18:5 in DGDGs,14:0/18:4,18:4/18:5,18:4/18:4 and 18:3/18:4 in MGDGs and 16:0/14:0,16:0/18:3,and 18:4/18:3 in *** addition,diacylglycerol(DAG)was the most abundant acylglycerols;the content of 22:6/18:4-DAG was the *** was a little amount of glycosphingolipid(GSL)in ***(DGMG),monogalactosylmonoglyceride(MGMG),sulfoquinovosylmonoacylglycerol(SQMG),monoglyceride(MAG),phospholi-pids(PLs),ceramide(Cer)and betaine lipids were nearly undetectable in *** fatty acid proportions of DGDGs,MGDGs,SQDGs,DAGs,triglycerides(TAGs)and GSLs were either higher or lower than or similar to those of ***,our isolation approach is applicable to many aspects of chloroplast biology,and may offer a reference for the isolation of chloroplasts from other marine microalgae.

关键词： Isochrysis galbana chloroplast isolation method lipid analysis chloroplast lipid

Identification and Expression of PPAR in Sinonovacula constricta and Their Potential Regulatory Effects on Δ6 Fad Transcription

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Journal of Ocean University of China 2021年第6期20卷 1557-1566页

作者： RAN Zhaoshou KONG Fei LIAO Kai xu jilin LIU Xingwang SHI Peng ZHANG Mengqi WU Kaibin YAN Xiaojun Key Laboratory of Applied Marine Biotechnology Ningbo UniversityMinistry of Education of ChinaNingbo 315211China Collaborative Innovation Center for Zhejiang Marine High-Efficiency and Healthy Aquaculture Ningbo UniversityNingbo 315211China Fujian Baozhi Aquatic Science and Technology Co. Ltd.Zhangzhou 363503China National and Local Joint Engineering Laboratory of Marine Biotechnology and Engineering Ningbo 315211China Key Laboratory of Marine Biological Engineering Ningbo 315211China Evergreen Feed Co. Ltd.Ningbo 315211China

Peroxisome proliferator activated receptors(PPAR)are kinds of key transcriptional factors in regulating LC-PUFA *** now,little is known about PPAR in marine molluscs as well as in other *** constricta is the first marine mollusc that is proved to possess the complete LC-PUFA biosynthetic pathway,and it can be a perfect representative to clarify this *** this study,the molecular properties of *** PPAR were characterized,and corresponding potential regulatory roles in ***Δ6 fatty acyl desaturase(Fad)transcription were estimated by dual luciferase *** showed that two PPAR homologs(PPAR_a and_b)were identified in *** both contain typical features of vertebrate PPAR,suggesting highly conserved functional regions in *** phylogenetic comparison,they are clearly different with vertebrate PPAR and can be divided into two distinctive ***,they show a high expression level in gill,labial palps,mantle and *** down-regulated expressions in trochophore larva and veliger larva might be attributed to ***,the transcriptional activity of ***Δ6 Fad promoter was significantly activated by both PPAR_a and_b,indicating that *** PPAR might play a role in the regulation of LC-PUFA *** our knowledge,this is the first systematic analysis of PPAR in a marine *** results will provide a valuable reference for further researches on the function of marine molluscan PPAR and their underlying mechanisms in regulating LC-PUFA biosynthesis.

关键词： Sinonovacula constricta peroxisome proliferator activated receptors Δ6 fatty acyl desaturase long chain-polyunsaturated fatty acids