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Microstructure and phase compositions of as-cast Mg–3.9Zn–0.6RE(Gd,Y) alloy with different Gd/Y ratios

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Rare Metals 2015年第3期34卷 160-163页

作者： Yang Yang Kui Zhang ming-Long ma Jia-Wei Yuan State Key Laboratory for Fabrication and Processing of Nonferrous Metals General Research Institute for Nonferrous Metals

Mg-Zn-RE （Gd, Y） alloys with different Gd/Y atomic ratios were prepared by conventional casting, and the microstructure of the alloys was studied by multiple means. Icosahedral quasicrystal phases are observed in all alloys. The different Gd/Y atomic ratios affect the micro- structures of the alloys irregularly. The alloy with more Gd has large dendritic structure and more complicated phase composition which are composed of I-phase lamellar eutectic, W-phase divorced eutectic, Mg-RE cuboid par- ticles and Mg-Zn binary phases. Other two alloys show similar microstructures and phase compositions with very thin lamellar eutectics which distribute along the inter- dendritic region, and the lamellar eutectics are formed by I-phase and Mg. The element contents of the I-phases and Mg-RE phases are partially controlled by the Gd/Y atomic ratio.

关键词： Mg-Zn-RE alloy Icosahedralquasicrystalline Microstructure Atomic ratio

Parameter inversion and location determination of evolutionary weak layer for open-pit mine slope

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International Journal of Coal Science & Technology 2020年第4期7卷 714-724页

作者： Zhao Hongze Wang Dongyu ma ming Zheng Kaihui School of Energy and Mining Engineering China University of Mining and TechnologyBeijing 100083China State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyBeijing 100083China Beijing Reliance Coal Research Institute Beijing 100083China North Weijiamao Coal Power Co.Ltd. Ordos 010308Inner MongoliaChina

In light of the complex and dynamic mechanical properties of evolving weak strata in open-pit mines,and the consequent difficulty of determining their mechanical parameters,this study uses the ultimate balance theory,along with the back analysis method combined with monitoring data on field displacement,to carry out parameter inversion using the FLAC3D numerical simulation *** edge slope of a working pit of the Weijiamao open-pit mine was used as research object to this *** the results obtained by the constitutive model were consistent with the field monitoring data,the evolving weak strata in the slope and the position of the landslide in the mine could be *** landslide was directed *** mechanism of the edge slope of the working pit was identified as unloading shear failure,and the feasibility of the method of parameter inversion was *** internal friction angle φand cohesion C of evolving weak strata in the slope of the open-pit mine were also obtained,where this compensated for the deficiency of laboratory tests and enabled the transformation from qualitative to quantitative *** can provide a reliable basis for the safe operation of open-pit mines.

关键词： Open-pit mine Evolution of weak layer Inverse analysis Monitoring data Numerical simulation

Selective nitration of aromatic compounds catalyzed by Hβ zeolite using N_2O_5

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Chinese Chemical Letters 2012年第7期23卷 809-812页

作者： Xiao ming ma Bin Dong Li Lei Chen ming Lu Chun Xu Lv Chemical Engineering College Nanjing University of Science and TechnologyNanjing 210094China

A selective and efficient process for the electrophilic nitration is described using N_2O_5 as a green nitrating agent,Hβ zeolite as a solid acid catalyst and shape controlling agent under mild conditions.

关键词： Selective nitration Hβ zeolite N2O5 Catalysis

Influence of Finish Rolling Temperature on Microstructure and Mechanical Properties of a 19Cr1.5Mo0.5W Ferritic Stainless Steel

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Acta Metallurgica Sinica(English Letters) 2020年第7期33卷 991-1000页

作者： Hou-Long Liu Ling-Ling Liu ming-Yu ma Li-Qing Chen State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819China

A 444-type heat-resistant ferritic stainless steel containing 0.05 wt% Ce(rare earth element) and 2 wt%(Mo+W) was adopted as an experimental material to study the effect of finish rolling temperature on microstructure and texture evolution as well as on mechanical properties and *** rolling processes contain hot rolling at two different finish rolling temperatures(860℃ and 770℃) and annealing,cold rolling and subsequent *** was found that the microstructures after hot rolling and annealing could be refined by lowering finish rolling *** resultant microstructures after cold rolling and annealing were hereditarily *** finish rolling temperature can weaken α-fiber texture in hotrolled or cold-rolled ferritic stainless steel strip,while γ-fiber texture in the final product was homogeneously ***,enhanced mechanical property and formability in terms of strength and average plastic strain ratio could be obtained via decreasing finish rolling temperature.

关键词： steel Microstructure microstructure

Stereocompfexed Poiy(iactide) Composites toward Engineering Plastics with Superior Toughness, Heat Resistance and Anti-hydrolysis

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Chinese Journal of Polymer Science 2020年第10期38卷 1107-1116,I0006页

作者： Bao-Gou Wu WeiJun Yang De-Yu Niu WeiFu Pong ming-Qing Chen Tian-Xi Liu ming-Liang Du Pi-ming ma The Key Laboratoryof Synthetic and Biogial Colloids Ministyof Educationliangnan UniversityWuxi214122 China

Polyl(lactide),PLA,suffers from bitleness and low heat deflection temperature(HDT),which limits its application as an engineering *** this work,poly(L-lactide)/poly(D-lactide)/ethylene-vinyl acetate glycidyl methacrylate random copolymer(PLLA/PDL A/EVM-Gma=1/1/x)composites were prepared by melt blending,and the in situ formed EVM-g PLA copolymers improved the compatibility between PLA and ***,the blends were subjected to a two-step annealing process during compression molding,*** annealing at 120℃ to rapidly form a certain amount of stereocomplex(sc)crystallites as nucleation sites,and then annealing at 200℃ to guide the formation of new *** differential scanning calorimetry(DSC)and wide angle X-ray dffrction(WAXD)measurements confirmed the formation of highly stereocomplexed PLA *** results showed that the PLLA/PDLA blend with 20 wt%of EVM-Gma had a notched impact strength up to 65 kJ/m2 and an elongation at break of 48%,while maintaining a tensile strength of 40 ***,dynamic mechanical analysis(Dma)and heat deflection tests showed that the PLA composite had an HDT up to 142℃ which is 90℃ higher than that of normal PLA *** electron microscopy(SEM)confirmed the fine dispersion of EVM-Gma particles,which facilitated to understand the toughening ***,the highly stereocomplexed PLA composites simultaneously exhibited excellent chemical and hydrolysis ***,these fascinating properties may extend the application range of sc PLA material as an engineering bioplastic.

关键词： PLA composites Stereocomplexation Annealing Heat resistance Toughness

Synthesis, characterization and theoretical study of 2-azido-4-nitroimidazole-based energetic salts

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Chinese Chemical Letters 2014年第3期25卷 438-440页

作者： Ke-Hui Hou Cong-ming ma Zu-Liang Liu School of Chemical Engineering Nanjing University of Science and Technology

The 2-azido-4-nitroimidazole-based energetic salts were synthesized in a simple and straightforward manner. The structures of these new salts were determined by IR, 1H NMR and 13C NMR spectroscopy and elemental analysis. These salts also exhibited high positive enthalpies of formation, high nitrogen content, and moderate detonation properties.

关键词： SynthesisEnergetic compoundsHeats of formation2-Azido-4-nitroimidazole

NUMERICAL COMPUTATION OF BOUNDED SOLUTIONS FORA SEMILINEAR ELLIPTIC EQUATION ON AN INFINITE STRIP

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Journal of Computational mathematics 1999年第2期17卷 159-170页

作者： Fu-ming ma(Department of mathematics, Jilin ’University, Changchun 130023, China) 吉林大学数学系吉林长春

In this paper, we consider the computation of bounded solutions of a semilinear elliptic equation on an infinite strip. The dynamical system approach and reduction on center manifold are used to overcome the difficult... 详细信息

关键词： numerical method nonlinear PDE center manifold

7, 8-dihydroxycoumarin improves neurological function in a mouse model of sciatic nerve injury

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Neural Regeneration Research 2012年第6期7卷 445-450页

作者： Jianshi Du Qing Zhao Yingli Zhang Yu Wang ming ma Department of Vascular Surgery China-Japan Union Hospital Jilin University Changchun 130033 Jilin Province China Department of Neurology China-Japan Union Hospital Jifin University Changchun 130033 Jilin Province China

In the present study, a mouse model of sciatic nerve injury was treated with intraperitoneal injection of 7, 8-dihydroxycoumarin （10, 5, or 2.5 mg/kg per day）. Western blot and real-time PCR results showed that growth associated protein 43 expression was significantly increased in the L4-6 segments of the spinal cord. The amplitude and velocity of motor nerve conduction in the sciatic nerve were significantly increased in model mice. In addition, the appearance of the myelin sheath in the injured sciatic nerve was regular, with an even thickness and clear outline, and the surrounding fibroplasia was not obvious. Our results indicate that 7, 8-dihydroxycoumarin can promote the repair of injured nerve by upregulating growth associated protein 43 expression in the corresponding spinal cord segments of mice with sciatic nerve injury.

关键词： 7, 8-dihydroxycoumarin growth associated protein 43 sciatic nerve peripheral nerve injury neural regeneration

Synergy enhancement of Co single atoms and asymmetric subnanoclusters for Fenton-like activation

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Nano Research 2024年第9期17卷 7935-7944页

作者： ming ma Zhiyi Sun Ziwei Deng Xiang Li Fang Zhang Wenxing Chen School of materials Key Laboratory of Cluster Science Ministry of EducationBeijing Key Laboratory of Photoelectronic/Electrophotonic Conversion MaterialsAdvanced Technologies Research Institute(Jinan)Advanced Research Institute of Multidisciplinary ScienceSchool of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China Energy and Catalysis Center School of Materials Science and EngineeringBeijing Institute of TechnologyBeijing 100081China Analysis and Testing Center Beijing Institute of TechnologyBeijing Institute of TechnologyBeijing 100081China

As a new water treatment technology,Fenton-like reaction has great *** this study,we successfully prepared an excellent Fenton-like catalyst,which is composed of cobalt monoatoms and asymmetric subnanoclusters(labeled CoSA/Clu-C_(2)N),and exhibits excellent peroxymonosulfate(PMS)activation *** directly comparing the catalytic properties of CoSA-C_(2)N and CoSA/Clu-C_(2)N,the synergistic effects of coasymmetric Co subclusters and Co atoms on the activation of PMS and degradation of organic micropollutants were *** results showed that CoSA/Clu-C_(2)N had higher degradation rates of carbamazepine(CBZ),antipyrine(AT)and chlorobenzoic acid(CA)when combined with active oxidant *** cyclic frequency of CBZ was 5.4 min^(-1),which was twice as high as the catalytic constant of CoSA-C_(2)N(2.4 min^(-1)).The results show that CoSA/Clu-C_(2)N cobalt subnanoclusters and cobalt single atom can synergistically improve the catalytic performance of activated PMS oxidation of micropollutants in *** addition,electron paramagnetic resonance(EPR)technology has proved that the introduction of Co subnano clusters in CoSA/Clu-C_(2)N is conducive to the production of singlet oxygen(1O_(2)),thereby improving the efficiency of pollutant *** work lays a solid foundation for the future design of advanced multifunctional catalysts by carefully regulating and combining monmetallic atoms and metal subnanoclusters.

关键词： carbamazepine Fenton-like reaction Co single atoms asymmetrical sub-nanoclusters peroxymonosulfate synergy enhancement