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Electrocatalytic characterization of Ni-Fe-TiO_(2) overlayers for hydrogen evolution reaction in alkaline solution

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Rare Metals 2023年第6期42卷 1858-1864页

作者： Jing-Guo Zhang Qiang Hu Shao-ming Zhang Shuo li Fei Ma Fan-Cai Chen Ya-ling wang li-min wang GRIPM Advanced Materials Co.Ltd General Research Institute for Nonferrous MetalsBeijing101407China General Research Institute for Nonferrous Metals Beijing100088China College of Chemistry and Chemical Engineering Hunan UniversityChangsha410082China

The Ni-Fe-TiO_(2) overlayers on mild steel strips were prepared by electrochemical deposition.The layers were characterized morphologically by confocal laser scanning microscopy and scanning electron microscopy(SEM) coupled with energy-dispersive spectroscopy(EDS)analysis.The layers exhibit a quasi-three-dimensional(3D)morphology in which the crystalline,TiO_(2),is embedded.Electrocatalytic activity of the Ni-Fe-TiO_(2) layers for the hydrogen evolution reaction(HER) was assessed by using pseudo-steady-state polarization curves and electrochemical impedance spectroscopy(EIS) in alkaline solution.The results were compared with the properties of Ni-Fe electrodes and used for determining the mechanism and kinetics of HER.In comparison with Ni-Fe electrodes,the synthesized Ni-Fe-TiO_(2) electrodes present higher catalytic activity for HER due to the increase in the real surface area and high intrinsic elec trocatalytic activity of titanium dioxide.The present study provides valuable insight for exploring practical applications of Ni-based alloys as hydrogen evolution electrodes.

关键词： Ni-Fe-TiO_(2) Hydrogen evolution reaction Electrodeposition Electrocatalytic activity

Friction and wear properties of PM cam materials with different boron contents

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Rare Metals 2023年第12期42卷 4255-4263页

作者： Rui wang lin-Shan wang Xue-Bing liang wang Zhang Yan-Ru Mu Jing-Jie Xu li-min wang Shao-ming Zhang General Research Institute for Nonferrous Metals Beijing 100088China GRIPM Advanced Materials Co.Ltd Beijing 101407China Beijing Hengyuantianqiao Powder Metallurgy Co.Ltd Beijing 101407China Beijing Engineering Research Center for Metal Powder Beijing 101407China

In this study,effects of B addition on the sintering densification,microstructure,hardness,friction and wear properties of sintered Fe-2.4C-4Cr-1Mo-0.5P-0.7Si-2.5Cu(in wt%)were investigated.In spite of the decreased sintered density,the addition of B changes the phase composition of the materials and their ratio.Moreover,hardness of either the matrix or the liquid solidification structure dramatically increases.These changes in micro structure result in higher friction coefficient and lower wear loss.It is observed that the addition of0.1 wt%B offers the optimum friction and wear properties with a running-in period of only 30 s and wear volume loss of 0.006 mm^(3) under the testing conditions.Such friction and wear properties are superior to those of the other two widely used cam materials,cast iron and 45 steel.

关键词： Boron addition Friction and wear property Cam material Microstructure Wear mechanism

Intermittent hypoxia is involved in gut microbial dysbiosis in type 2 diabetes mellitus and obstructive sleep apnea-hypopnea syndrome

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World Journal of Gastroenterology 2022年第21期28卷 2320-2333页

作者： Sha-Sha Tang Cheng-Hong liang Ya-Lei liu Wei Wei Xin-Ru Deng Xiao-Yang Shi li-min wang li-Jun Zhang Hui-Juan Yuan Department of Endocrinology Henan Provincial Key Medicine Laboratory of Intestinal Microecology and DiabetesHenan Provincial People’s HospitalPeople’s Hospital of Zhengzhou UniversityZhengzhou 450003Henan ProvinceChina

BACKGROUND Obstructive sleep apnea(OSA)-hypopnea syndrome(OSAHS)has been recognized as a comorbidity of type 2 diabetes mellitus(T2DM);more than half of T2DM patients suffer from OSAHS.Intermittent hypoxia(IH)plays an important role in metabolic diseases,such as obesity and OSAHS,through various mechanisms,including altering the gut microecological composition and function.Therefore,it is important to study the role of gut microbiota in T2DM patients with OSAHS,which has a high incidence and is prone to several complications.AIM To assess whether IH is involved in altering the fecal microbiome in T2DM patients with OSAHS.METHODS Seventy-eight participants were enrolled from Henan Province People’s Hospital and divided into healthy control(HC,n=26),T2DM(n=25),and T2DM+OSA(n=27)groups based on their conditions.The fecal bacterial DNA of the research participants was extracted and subjected to 16S ribosomal RNA sequencing.The clinical indices,such as insulin resistance index,homocysteine(HCY)concentration,and the concentrations of inflammatory factors in the peripheral blood,were assessed and recorded.RESULTS Group T2DM+OSA had the highest apnea-hypopnea index(AHI)(2.3 vs 3.7 vs 13.7),oxygen desaturation index(0.65 vs 2.2 vs 9.1),HCY concentration(9.6μmol/L vs 10.3μmol/L vs 13.81μmol/L)and C-reactive protein(CRP)concentrations(0.3 mg/L vs 1.43 mg/L vs 2.11 mg/L),and lowest mean oxygen saturation(97.05%vs 96.6%vs 94.7%)among the three groups.Twelve and fifteen key differences in amplicon sequence variants were identified when comparing group T2DM+OSA with groups T2DM and HC,respectively.We found progressively decreased levels of Faecalibacterium,Eubacterium,and Lachnospiraceae,and an increase in the level of Actinomyces,which strongly correlated with the HCY,CRP,fasting plasma glucose,and hemoglobin A1c concentrations,AHI,mean oxygen saturation,and insulin resistance index in group T2DM+OSA(P<0.05).CONCLUSION For T2DM patients with OSAHS,IH may be involved in selective alterations of the gut microbiota,which may affe

关键词： Gut microbiota Obstructive sleep apnea-hypopnea syndrome Type 2 diabetes mellitus Intermittent hypoxia Obstructive sleep apnea

Polymorphisms of some cytokines and chronic hepatitis B and C virus infection

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World Journal of Gastroenterology 2009年第44期15卷 5610-5619页

作者： Qiu-Ju Gao Dian-Wu liu Shi-Yong Zhang min Jia li-min wang li-Hong Wu Shu-Yun wang li-Xin Tong Department of Epidemiology Public Health College Hebei Medical University Shijiazhuang 050017 Hebei Province China Department of Preventive Medicine Bethune Military Medical College of PLA Shijiazhuang 050081 Hebei Province China Institution of Epidemiology Center for Disease Prevention and Control of Shijiazhuang Shijiazhuang 050011 Hebei Province China Department of Biochemistry Detection the People's Hospital of Hebei Province Shijiazhuang 050071 Hebei Province China Center of liver Diseases the First Affiliated Hospital of Hebei Medical University. Shijiazhuang 050031 Hebei Province China

AIM:To study the relationship between the poly- morphisms in some cytokines and the outcome of hepatitis B virus(HBV)and hepatitis C virus(HCV)infection. METHODS:Samples were obtained from 203 patients infected with HBV and/or HCV while donating plasma in 1987,and 74 controls were obtained from a rural area of North China.Antibodies to HBV or HCV antigens were detected by enzyme-linked immunoassay.The presence of viral particles in the serum was determined by nested reverse-transcriptase polymerase chain reaction (PCR).Hepatocellular injury,as revealed by alanine aminotransferase(ALT)and aspartate aminotransferase level,was detected by a Beckman LX-20 analyzer. DNA was extracted from blood cells.Then,the single nucleotide polymorphisms of IL-2-330,IFN-γ+874, IL-10-1082/-592 and IL-4-589 were investigated by restriction fragment length polymorphism-PCR or sequence specific primer-PCR.RESULTS:Persistent infection with HBV,HCV,and HBV/HCV coinfection was associated with IL-2-330 TT genotype and T allele,IFN-γ+874 AA genotype,and IL-10-1082 AA genotype.The clinical outcome of HBV and/or HCV infection was associated with IL-2-330 TT genotype and T allele,IFN-γ+874 AA genotype, and IL-10-1082 AA genotype.IL-2-330 GG genotype frequency showed a negative correlation with clinical progression,IL-10-1082 AA genotype frequency showed a positive correlation and IL-10-1082 AG genotype frequency showed a negative correlation with clinical progression.HCV RNA positive expression was associated with IL-10-1082 AA genotype and the A allele frequency.Abnormal serum ALT level was associated with IL-10-592 AC genotype frequency and IL-4-589 CC genotype,CT genotype,and the C allele. CONCLUSION:These results suggest that polymor- phisms in some cytokine genes influence persistent HBV and HCV infection,clinical outcome,HCV replication, and liver damage.

关键词：基因多态性病毒感染丙型肝炎细胞因子乙型慢性

The K°-relation on the Congruence Lattice of a Regular Semigroup with an Inverse Transversal

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Acta Mathematica Sinica,English Series 2012年第5期28卷 1061-1074页

作者： Ying Ying FENG li min wang Department of Information Science and Mathematics Foshan University School of Mathematics South China Normal University

Let S be a regular semigroup with an inverse transversal S° and C（S） the congruence lattice of S. A relation K° on C（S） is introduced as follows： if p, θ∈ C（S）, then we say that p and 0 are K°-related if Ker pO = Ker θ°, where p°= p｜s°. Expressions for the least and the greatest congruences in the same K°-class as p are provided. A number of equivalent conditions for K° being a congruence are given.

关键词： Regular semigroup inverse transversal congruence K°-relation

A Synthetic Photorespiratory Shortcut Enhances Photosynthesis to Boost Biomass and Grain Yield in Rice

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Molecular Plant 2020年第12期13卷 1802-1815页

作者： li-min wang Bo-Ran Shen Bo-Di li Chuan-ling Zhang min lin Pan-Pan Tong li-li Cui Zhi-Sheng Zhang Xin-Xiang Peng State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources College of Life SciencesSouth China Agricultural UniversityGuangzhou 510642China College of Agriculture and Biology Zhongkai University of Agriculture and EngineeringGuangzhouChina

Several photorespiratory bypasses have been introduced into plants and shown to improve photosynthesis by increasing chloroplastic C02 concentrations or optimizing energy balance.We recently reported that an engineered GOC bypass could increase photosynthesis and productivity in rice.However,the grain yield of GOC plants was unstable,fluctuating in different cultivation seasons because of varying seed setting rates.In this study,we designed a synthetic photorespiratory shortcut(the GCGT bypass)consisting of genes en-coding Oryza sativa glycolate oxidase and Escherichia coli catalase,glyoxylate carboligase,and tartronic semialdehyde reductase.The GCGT bypass was guided by an optimized chloroplast transit peptide that targeted rice chloroplasts and redirected 75% of carbon from glycolate metabolism to the Calvin cycle,identical to the native photorespiration pathway.GCGT transgenic plants exhibited significantly increased biomass production and grain yield,which were mainly attributed to enhanced photosynthesis due to increased chloroplastic C02 concentrations.Despite the increases in biomass production and grain yield,GCGT transgenic plants showed a reduced seed setting rate,a phenotype previously reported for the GOC plants.Integrative transcriptomic,physiological,and biochemical assays revealed that photosynthetic car-bohydrates were not transported to grains in an efficient manner,thereby reducing the seed setting rate.Taken together,our results demonstrate that the GCGT photorespiratory shortcut confers higher yield by promoting photosynthesis in rice,mainly through increasing chloroplastic C02 concentrations.

关键词： photorespiratory shortcut photosynthesis yield rice

The development and challenges of rechargeable non-aqueous lithium-air batteries

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International Journal of Smart and Nano Materials 2013年第1期4卷 27-46页

作者： Lei-Lei Zhang Zhong-li wang Dan Xu Xin-Bo Zhang li-min wang State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022JilinPeople’s Republic of China Graduate University of Chinese Academy of Sciences Beijing 100049People’s Republic of China

lithium-air(li-air)batteries have recently received much attention due to their extremely high theoretical energy densities.The significantly larger theoretical energy density of li-air batteries is due to the use of a pure lithium metal anode and the fact that the cathode oxidant,oxygen,is stored externally since it can be readily obtained from the surrounding air.However,before li-air batteries can be realized as high-performance,commercially viable products there are still numerous scientific and technical challenges that must be overcome,from designing the cathode structure,to optimizing the electrolyte compositions and elucidating the complex chemical reactions that occur during charge and discharge.The scientific obstacles that are related to the performance of li-air batteries open up an exciting opportunity for researchers from many different backgrounds to utilize their unique knowledge and skills to bridge the knowledge gaps that exist in current research projects.This review article is a summary of the most significant developments and challenges of practical li-air batteries and the current understanding of their chemistry.

关键词： lithium-air battery high energy density electrolyte separator catalyst

Laves Phase in 22Cr-27Ni-2Ti-Al Austenitic Valve Steel

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Journal of Iron and Steel Research(International) 2016年第12期23卷 1303-1308页

作者： li-min wang Cheng-cheng XUE Gang YANG Zheng-dong liU Institute for Special Steels Central Iron and Steel Research Institute Faculty of Materials Science and Engineering Kunming University of Science and Technology

The Thermo Calc software was employed to calculate the equilibrium phase of 22Cr-27Ni-2Ti-Al austenitic valve steel, and the Laves phase in this steel was investigated after solid solution and aging by means of scanning electron microscopy （SEM）, transmission electron microscopy （TEM） and X- ray diffraction （XRD）. Results show that the microstructure of the experimental steel consists of γ, γ′, Laves and NbC. I.aves phases mainly precipitate on grain boundaries, with granular and fibrous morphologies. The size of the granular Laves phase is about 50-600 nm, and the fihrous Laves phase is composed of short strip Laves phases which are 300-600 nm in length and 50 150 nm in width. These two morphologies of Laves phase coarsen with increasing aging temperature, and this steel possesses the highest strength and hardness at aging temperature of 760 ℃.

关键词： 22Cr-27Ni-2Ti A1 austenitic valve steel microstructure Laves phase aging

Electrochemical hydrogen storage properties of melt-spun Ti0.9Zr0.1V0.2Ni1.5La0.5 alloy

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Frontiers of physics 2011年第2期6卷 209-213页

作者： Jian wang Guang-bo CHE Qing-wei wang Wan-xi ZHANG li-min wang Key Laboratory of Preparation and Applications of Environmental Friendly Materials （ministry of Education） Jilin Normal University Siping 136000 China State Key Laboratory of Rare Earth Resource Utilization Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China

The Ti0.9Zr0.1V0.2Ni1.5La0.5 alloy samples were synthesized by melt-spinning technique at the different wheel velocity （cooling rate）, and the structure and electrochenfical hydrogen storage properties were investigated. The result indicated that the structure of the melt-spun ribbons mainly contains C14 Laves phase and V-based solid solution phase. The discharge capacity, cyclic stability, high-rate discharge ability and electrochemical kinetic of the alloy electrodes are correlated with the cooling rate （wheel velocity）, and the maximum discharge capacity is over 200 mA.h/g at the wheel velocity of 20 m/s.

关键词： Ti0.9Zr0.1V0.2Ni1.5La0.5 alloy melt-spinning hydrogen storage electrochemical prop-erties