检索结果-南通市图书馆

Wear and corrosion resistance of laser-cladded Fe-based composite coatings on AISI 4130 steel

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2018年第6期25卷 716-728页

作者： Li Fan hai-yan chen Yao-hua Dong Li-hua Dong yan-sheng Yin College of Ocean Science and Engineering Shanghai Maritime University Department of Marine Engineering Nantong Shipping College School of Mechanical Engineering Shanghai Jiaotong University

The wear and corrosion resistance of Fe_（72.2）Cr_（16.8）Ni_（7.3）Mo_（1.6）Mn_（0.7）C_（0.2）Si_（1.2） and Fe_（77.3）Cr_（15.8）Ni_（3.9）Mo_（1.1）Mn_（0.5）C_（0.2）Si_（1.2） coatings laser-cladded on AISI 4130 steel were *** coatings possess excellent wear and corrosion resistance despite the absence of expensive yttrium,tungsten,and cobalt and very little *** microstructure mainly consists of dendrites and eutectic phases,such as duplex（γ＋α）-Fe and the Fe–Cr（Ni）solid solution,confirmed via energy dispersive spectrometry and X-ray *** cladded Fe-based coatings have lower coefficients of friction,and narrower and shallower wear tracks than the substrate without the cladding,and the main wear mechanism is mild abrasive *** test results suggest that the soft Fe_（72.2）Cr_（16.8）Ni_（7.3）Mo_（1.6）Mn_（0.7）C_（0.2）Si_（1.2） coating with high Cr and Ni concentrations has high passivation resistance,low corrosion current,and positive corrosion potential,providing a better protective barrier layer to the AISI 4130 steel against corrosion.

关键词： Fe-based coating laser cladding AISI 4130 steel wear resistance corrosion resistance

Radial Distribution Characteristics of Microstructure and Mechanical Properties of Ti–6Al–4V Butt Joint by Rotary Friction Welding

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2015年第10期28卷 1291-1298页

作者： hai-yan chen Li Fu Wen-Yuan Zhang Fen-Jun Liu State Key Laboratory of Solidification Processing Northwestern Polytechnical University Shaanxi Key Laboratory of Friction Welding Technologies

Ti-6Al-4V rods were butt-welded by rotary friction welding in this study. Additionally, the radial differences in microstructure and mechanical property of joints were investigated by hierarchy slicing method. The results displayed that the width of weld zone and heat-affected zone of joints became wider along radial direction. Meanwhile, the tensile strength of joints decreased gradually along the radial direction. According to the theoretical analysis, the temperature gradient and inhomogeneous forging pressure leaded to the radial differences. Through K-type thermocouples, the actual temperatures at different locations were measured, and the results were consistent with the theoretical analysis. Theoretically, the radial differences of rotary friction welding joint are an inherent phenomenon; thus, the size of weldment should be limited strictly below the corresponding critical size. In order to prevent radial differences from enlarging, the welding surface profile of weldment can be processed into oval shape, and a larger forging pressure can be used within the scope of the joint deformation allowed according to causes for radial differences.

关键词： Titanium alloys Friction welding Microstructure Mechanical property

Corrosion behavior of Ni-based coating containing spherical tungsten carbides in hydrochloric acid solution

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2019年第2期26卷 191-199页

作者： Shan-shan Liu hai-yan chen Xuan Zhao Li Fan Xiao-ming Guo yan-sheng Yin School of Chemical and Environment Engineering Shanghai Institute of TechnologyShanghai 201418China College of Ocean Science and Engineering Shanghai Maritime UniversityShanghai 201306.China

A Ni-based alloy coating with 30 wt.%spherical fungsten carbide particles was prepared through plasma transferred arc welding on 42CrMo *** composition and microstructure of the coati ng were examined through X-ray diffraction and scanning electron microscopy with energy-dispersive *** corrosion behaviors of the coating compared to the Ni coating without tungsten carbide particles and to the bare substrate in a0.5 mol/L HC1 solution were presented through polarization curves,electrochemical impedance spectroscopy(EIS)measurements and long-term immersion *** results demonstrated that the composite coating microstructure comprised Ni matrix,Ni-rich phase,tungsten carbide particles,W-rich phase and Cr-rich *** polarization curves and EIS measurements presented that a passivation film,which mainly included Ni,Cr,Fe and W oxides,was formed in the composite coating that protected the substrate from corrosion by HC1 *** the immersion tests,a micro-galvanic reaction at the new-formed phases and Ni matrix interface caused severe pit corrosion and Ni matrix *** debonding of Ni-rich and W-rich phases could be observed with the immersion time *** tungsten carbide particles and Cr-rich phase were still attached on the surface for up to 30 days.

关键词： Plasma transferred welding Spherical tungsten carbide Ni-based coating Corrosion resistance Electrochemical impedanee spectroscopy

Effects of lower fluence pulsed dye laser irradiation on production of collagen and the mRNA expression of collagen relative gene in cultured fibroblasts in vitro

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Medical Journal 2006年第18期119卷 1543-1547页

作者： YU hai-yan chen Da-fang WANG Qi chenG Hao Department of Dermatology Sir Run Run Shaw Hospital of Zhejiang University Hangzhou 310016 China

Background Lower fluence of 585-nm flashlamp-pumped pulsed dye laser has been successfully used as a nonablative technique in the treatment of wrinkles. The objective of this study was to evaluate the effect of the pulsed dye laser （585 nm） on the production of collagen and the mRNA expression of collagen related gene in fibroblasts in vitro. Methods Cultured fibroblasts were treated with a 585-nm flashlamp-pumped pulsed dye laser （ fluence 3 J/cm^2, 4 J/cm^2, spot size 7 mm, pulse duration 450 12s）. The production of collagen and the mRNA expression of transforming growth factor （TGF）-β1, SMAD2, SMAD3, SMAD4, SMAD7 and type Ⅰ procollagen α1, α2 in fibroblasts were investigated by colorimetry or real time polymerase chain reaction. Results The production of collagen was significantly up-regulated after treatment with a 585-nm flashlamp-pumped pulsed dye laser with a fluence of 3 J/cm^2 （P 〈0.001）. The mRNA expression of TGF- β1, SMAD2, SMAD3, SMAD4, SMAD7 and procollagen I was significantly up-regulated after treatment with a 585-nm flashlamp-pumped pulsed dye laser with a fluence of 3 J/cm^2 （P 〈0.001）. No significant difference of mRNA expression of SMAD2, SMAD3, SMAD4, SMAD7 and type Ⅰ procollagen was found between controls and fibroblasts treated with pulsed dye laser with a fluence of 4 J/cm^2 （P 〉0.05）. Conclusions Lower fluence （3 J/cm^2） pulsed dye laser increased the collagen production in fibroblasts by up-regulating TGF-β1, SMAD2, SMAD3, SMAD4, SMAD7 and type Ⅰ procollagen mRNA expression. These may be the reason it can be effectively used in the treatment of wrinkles.

关键词： pulsed dye laser fibroblasts procollagen SMADs

Synthesis of anatase TiO2 with exposed {001} and {101} facets and photocatalytic activity

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2019年第4期38卷 287-291页

作者： Jia Sun Ming Zhang Zhi-Feng Wang hai-yan chen Ye chen Naoya Murakami Teruhisa Ohno School of Chemistry and Chemical Engineering Yangzhou University Yangzhou 225002 China Department of Applied Chemistry Faculty of Engineering Kyushu Institute of Technology Kitakyushu 804-8550 Japan Testing Center Yangzhou University Yangzhou 225002China Department of Chemical Engineering Yangzhou Polytechnic InstituteYangzhou 225002 China Japan Science and Technology Agency Saitama 3320012 Japan

Anatase titanium(IV) oxide (TiO2) particles with exposed {()01) and {101) facets were prepared by hydrothermal treatment of amorphous TiO2 with H2O2- NH3 solution. Crystal phase, shape, and size of TiO2 particles are found to be greatly dependent on the ratio of H2O2-NH3 solution. The prepared TiOo particles with specific exposed crystal faces show higher photocatalytic activity for acetaldehyde decomposition than commercial spherical TiO^ particles. This result implies that recombination is prevented by spatial separation of redox sites in the particles because of selective migration of electrons and positive holes to specific exposed crystal faces and/or different reactivity of electrons and positive holes on the specific exposed crystal face.

关键词： Anatase {001} and {101} facets H2O2-NH3

Lanthanum Prevents Salt Stress-induced Programmed Cell Death in Rice Root Tip Cells by Controlling Early Induction Events

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2007年第7期49卷 1024-1031页

作者： Jian-You Li Ai-Liang Jiang hai-yan chen Ying Wang Wei Zhang Department of Biochemistry and Molecular Biology College of Life Science Nanjing Agricultural University Nanjing 210095 China

In a previous study, a salt stress-induced programmed cell death （PCD） model was established in rice root tip cells. Here, by using Wuyunjing 8th rice seedlings, the effects of lanthanum on salt stress-induced PCD early events were studied. The results indicated that low concentrations （10 μmol/L）, but not high concentrations （100 μmol/L） of LaCl3 could effectively prevent salt stress-induced PCD. Further study demonstrated that in the early stages of salt-induced PCD process, 10 μmol/L of La^3＋ could prevent the increase of cytoplasmic calcium levels, inhibit reactive oxygen species （ROS） production, and enhance the ROS-scavenging enzyme activities such as superoxide dismutases （SOD） and ascorbate peroxidase （APX）. Imidazole （20 mmol/L）, the inhibitor of nicotinamide adenine dinucleotide phosphate-oxidase （NADPH oxidase）, could alleviate the occurrence of PCD obviously, and such alleviation could be enhanced by the addition of La^3＋, indicating the involvement of NADPH oxidase in the salt stress-induced PCD process. Taken together, lanthanum could prevent salt stress-induced PCD occurrence in the rice root tip cells by blocking the calcium influx under stress, which was followed by inhibiting calcium-dependent NADPH oxidase activity to prevent O2^·- production and, enhancing the cytosolic antioxidative enzyme activities to scavenge the reactive oxygen species.

关键词： Ca^2+ Oryza sativa programmed cell death reactive oxygen species salt stress.

Microstructure and properties of honeycomb composite films containing Eu and Sn

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2023年第6期42卷 2068-2074页

作者： hai-yan chen Lu Li Zhi-Feng Wang Jun-Liang Liu cheng-Yin Wang Ming Zhang School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou225009China School of Chemistry and Chemical Engineering Yangzhou Polytechnic CollegeYangzhou225127China Testing Center Yangzhou UniversityYangzhou225009China

Honeycomb composite films were prepared by breath figure method via a straightforward,one-step process by doping complex containing Eu or Sn into polystyrene-b-poly(acrylic acid) *** key influencing factors,such as the concentration of the block polymer solution,the relative humidity of the environment and the amount of complexes,were investigated to control micropore size and tune film surface *** characteristics of the composite films were studied by scanning electron microscopy(SEM),atomic force microscopy(AFM),X-ray diffraction(XRD),ultraviolet and emission *** indicate that composite films containing Eu have excellent optical performance,and micro-patterned bowl-like SnO_(2) microparticles could be fabricated from composite films containing Sn after being calcined at 600℃ for 5 *** general approach for the fabrication of honeycomb composite films opens a convenient and effective route to the functional modification of honeycomb films and offers new prospects for the application in miniaturized sensors,micro-reactor and catalysis.

关键词： Honeycomb composite film Complex containing Eu Tin dioxide Breath figure method Microstructure

Improvement of photocatalytic activity of high specific surface area graphitic carbon nitride by loading a co-catalyst

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2019年第5期38卷 468-474页

作者： Ye chen Naoya Murakami hai-yan chen Jia Sun Qi-Tao Zhang Zhi-Feng Wang Teruhisa Ohno Ming Zhang Department of Materials Science Faculty of EngineeringKyushu Institute of TechnologyKitakyushu 8048550Japan School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002China yangzhou Polytechnic Institute Yangzhou 225127.China Japan Science and Technology Agency Kawaguchi 3320012Japan

Graphitic carbon nitride(g-C3N4)was synthesized by heating melamine and was then treated with sodium hydroxide solution under a hydrothermal condition to obtain g-C3N4 with a large specific surface area(HSSA).HSSA shows higher photocatalytic activity for decomposition of acetaldehyde than that of original *** was modified with RuO2 as a co-catalyst by the impregnation *** loaded with 0.05 wt%RuO2 shows the highest photocatalytic activity for acetaldehyde decomposition under visible light(k=455 nm).

关键词： Graphitic carbon nitride Organic decomposition Co-catalyst Visible light

The value of serum metabolomics analysis in predicting the response to cardiac resynchronization therapy

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2019年第7期16卷 529-539,I0001-I0004页

作者： Meng-Ruo ZHU Zibire Fulati yang LIU Wen-Shuo WANG Qian WU yan-Gang SU hai-yan chen Xian-Hong SHU Department of Echocardiography Zhongshan HospitalFudan UniversityShanghai Institute of Cardiovascular DiseasesShanghaiChina Department of Cardiology Zhongshan HospitalFudan UniversityShanghai Institute of Cardiovascular DiseasesShanghaiChina Department of Cardiac Surgery Zhongshan HospitalFudan UniversityShanghai Institute of Cardiovascular DiseasesShanghaiChina Shanghai Center for Bioinformation Technology ShanghaiChina

Objective To construct a prediction model based on metabolic profiling for predicting the response to cardiac resynchronization therapy(CRT).Methods Peripheral venous(PV)and coronary sinus(CS)blood samples were collected from 25 patients with heart failure(HF)at the time of CRT implantation,and PV blood samples were obtained from ten healthy *** serum samples were analyzed by liquid chromatography-mass spectrometry(LC-MS).As per the clinical and echocardiographic assessment at the 6-month follow-up,the HF patients were categorized as CRT responders and *** HF patients had altered serum metabolomic profiles that were significantly different from those of the healthy *** metabolites were also observed between CRT responders and non-responders.A prediction model for CRT response(CRT-Re)was constructed using the concentration levels of the differential metabolites,L-arginine and *** optimal cutoff value of the CRT-Re model was found to be 0.343 by ROC analysis(sensitivity,88.2%;specificity,87.5%;Area under curve(AUC)=0.897,P=0.002).The concentration levels of the differential metabolites,L-arginine and lysyl-gamma-glutamate,in PV serum were significantly correlated with that in CS serum(r=0.945 and 0.680,respectively,all P<0.001).Conclusions Our results suggest that serum-based metabolic profiling may be a potential complementary screening tool for predicting the outcome of CRT.

关键词： Biomarker Cardiac resynchronization therapy Heart failure Metabolomics Serum