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Arc characteristics of submerged arc welding with stainless steel wire

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International Journal of Minerals,Metallurgy and Materials 2014年第8期21卷 772-778页

作者： Ke Li Zhi-sheng Wu Cui-rong Liu feng-hua chen College of Materials Science and Engineering Taiyuan University of Science and Technology

The arc characteristics of submerged arc welding （SAW） with stainless steel wire were studied by using Analysator Hannover （AH）. The tests were carded out under the same preset arc voltage combined with different welding currents. By comparing the probability density distribution （PDD） curves of arc voltage and welding current, the changes were analyzed, the metal transfer mode in SAW was deduced, and the characteristics of a stable arc were summarized. The analysis results show that, with an increase of welding parameters, the short-circuiting peak in the PDD curves of arc voltage decreases gradually until it disappears, and the dominant metal transfer mode changes from flux-wall guided transfer to projected transfer and then to streaming transfer. Moreover, when the PDD curves of arc voltage are both unimodal and generally symmetrical, the greater the peak probability and the smaller the peak span, the more stable the arc becomes.

关键词： submerged arc welding electric arc characteristics stainless steel wire metal transfer

Effect of Sm-doping on the morphology and magnetic properties of radio frequency magnetron sputtered Ni-Mn-Ga films

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International Journal of Minerals,Metallurgy and Materials 2012年第6期19卷 555-560页

作者： feng-hua chen Min-gang Zhang Yue-sheng Chai Chang-wei Gong College of Materials Science and Engineering Taiyuan University of Science and Technology Talyuan 030024 China

Ni55.5Mn21Ga23.5 and Ni54Mn22Ga23Sml films were prepared by radio frequency （RF） magnetron sputtering. The effect of Sm do- pant on the morphologic and magnetic properties of Ni55.5Mn21Ga23.5 films was investigated. Sm doping can refine the particle size of the films from 100 to 60 nm, and further grain growth is not occurs even after annealing at 1073 K for 3.6 ks. Compared to Ni55.5Mn21Ga23.5 films, Sm-doped Ni54Mn22Ga23Sml films are easier to be magnetized and have a lower martensitic transformation temperature. In addition, the Curie temperature can also be adjusted, decreasing from 350 to 325 K after Sm doping. Martensitic transformation is not observed in the Sm-free films, which is close to the Curie temperature in the Sm-doped films, giving rise to the overlap of the structural and magnetic transi- tion temperatures.

关键词： magnetic films samarium doping magnetron sputtering martensitic transformation magnetic transition temperature magneticproperties rare earths

Magnetic properties and anomalous Hall effect of Mn3Sn thin films controlled by defects and ferroelectric 0.7Pb(Mg_(1/3)Nb_(2/3))O_(3)–0.3PbTiO_(3) substrate

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Rare Metals 2021年第10期40卷 2862-2867页

作者： Zhong-Ping Zhao Qi Guo feng-hua chen Ke-Wei Zhang Yong Jiang School of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024China

Noncollinear antiferromagnetic Mn_(3)Sn films have received much attention due to their potential applications in antiferromagnetic spintronic devices. In this work, single-phase polycrystalline antiferromagnetic Mn_(3)Sn thin films were successfully prepared by magnetron sputtering. The defects in the thin films were regulated by adjusting the sputtering power. The relationship among the films structure, the anomalous Hall effect(AHE) and the defects was investigated. High defect concentration in the Mn_(3)Sn films led to large room temperature ferromagnetic moments. The maximum saturation magnetization reached up to ~16 k A·m^(-1)(36 mlB/Mn), which was much larger than the values reported in literatures. The coercive field of38 mT was obtained in a high-quality Mn_(3)Sn film, which effectively reduced the flipping magnetic field. Moreover,the anomalous Hall resistance and coercive field of the Mn_(3)Sn films prepared on the ferroelectric substrates were manipulated through an applied electric field, indicating that the piezoelectric stress has a great influence on the nonzero Berry curvature of the triangular spin structure in the antiferromagnetic materials. These results will promote the potential application of Mn_(3)Sn in high-density and lowpower antiferromagnetic spintronic devices.

关键词： Noncollinear antiferromagnet Mn_(3)Sn Anomalous Hall effect Ferromagnetic moment Electric field manipulation

The modulation of the discharge plateau of benzoquinone for sodium-ion batteries

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International Journal of Minerals,Metallurgy and Materials 2021年第10期28卷 1675-1683页

作者： feng-hua chen Yi-wen Wu huan-hong Zhang Zhan-tu Long Xiao-xin Lin Ming-zhe chen Qing chen Yi-fan Luo Shu-Lei Chou Rong-hua Zeng Key Laboratory of Theoretical Chemistry of the Environment Ministry of EducationSchool of ChemistrySouth China Normal UniversityGuangzhou 510006China Institute for Superconducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of WollongongInnovation CampusSquires WayNorth WollongongNSW 2522Australia Department of Mechanical and Aerospace Engineering and Department of ChemistryThe Hong Kong University of Science and TechnologyHong KongChina Key Laboratory of Advanced Energy Materials Chemistry(Ministry of Education) College of ChemistryNankai UniversityTianjin 300071China

p-Benzoquinone(BQ)is a promising candidate for next-generation sodium-ion batteries(SIBs)because of its high theoretical specific capacity,good reaction reversibility,and high resource ***,practical application of BQ faces many challenges,such as a low discharge plateau(~2.7 V)as cathode material or a high discharge plateau as anode material compared with inorganic materials for SIBs and high solubility in organic electrolytes,resulting in low power and energy ***,tetrahydroxybenzoquinone tetrasodium salt(Na_(4)C_(6)O_(6))is synthesized through a simple neutralization reaction at low *** four-ONa electron-donating groups introduced on the structure of BQ greatly lower the discharge plateau by over 1.4 V from ~2.70 V to ~1.26 V,which can change BQ from cathode to anode material for *** the same time,the addition of four-ONa hydrophilic groups inhibits the dissolution of BQ in the organic electrolyte to a certain *** a result,Na_(4)C_(6)O_(6) as the anode displays a moderate discharge capacity and cycling performance at an average work voltage of ~1.26 V versus Na/Na^(+).When evaluated as a Na-ion full cell(NIFC),a Na_(3)V_(2)(PO_(4))_(3)||Na_(4)C_(6)O_(6) NIFC reveals a moderate discharge capacity and an average discharge plateau of ~1.4 *** research offers a new molecular structure design strategy for reducing the discharge plateau and simultaneously restraining the dissolution of organic electrode materials.

关键词： discharge plateau electron-donating groups dissolution sodium-ion batteries

Studies on the Effects of Epimedium Extract on Erythrocytes

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Chinese Chemical Letters 2006年第8期17卷 1105-1108页

作者： Xiao Yu ZHANG feng hua chen Ping Hui WEI Jia Zuan NI Department of Biological Engineering College of Environment ＆ Chemical Engineering Yanshan University Hebei 066004 Key Laboratory of Rare Earth Chemistry and Physics Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022

The effect of Epimedium extract （EE） on erythrocytes was investigated by atomic force microscopy （AFM）. The images of the surface structures showed clear concave and progressive increase of surface roughness of erythrocyte after incubation with EE at concentration of 0.2 or 0.05 g/L, far below its critical hemolytic levels. The AFM results also indicated that the granules of the fine surface structure increased, which caused by aggregation of membrane protein. Further study showed that the change in surface topography of erythrocyte membrane might be connected with the increase of intracellular free Ca^2＋ induced by EE.

关键词： AFM Epimedium extract (EE) erythrocyte intracellular free Ca^2+.

Precise determination of the pole position of the exotic Z_(c)(3900)

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Science China(Physics,Mechanics & Astronomy) 2024年第9期67卷 84-90页

作者： Yun-hua chen Meng-Lin Du feng-Kun Guo School of Mathematics and Physics University of Science and Technology BeijingBeijing 100083China School of Physics University of Electronic Science and Technology of ChinaChengdu 611731China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Peng huanwu Collaborative Center for Research and Education Beihang UniversityBeijing 100191China

We perform a unified description of the experimental data of the π^(+)π^(-)and J/ψπ^(±)invariant mass spectra for e^(+)e^(-)→J/ψπ^(+)π^(-)and the D^(0)D^(*-)mass spectrum for e^(+)e^(-)→D^(0)D^(*-)π^(+)at e^(+)e^(-)center-of-mass energies 4.23 and 4.26 *** analysis takes into account open-charm meson loops that contain triangle singularities,the J/ψπ-DD^(*)coupled-channel interaction respecting unitarity,and the strong ππ-KK final state interaction using dispersion *** analysis leads to a precise determination of the Z_(c)(3900)pole with the pole mass and width(3880.7±1.7_(stat)±22.4_(syst))MeV and(35.9±1.4_(stat)±15.3_(syst))MeV,respectively,and hints at that the DD^(*)molecular and non-molecular components are of similar importance in the Z_(c)(3900)formation.

关键词： exotic hadrons dispersion relations final state interaction triangle singularity

Effects of magnetic field and hydrostatic pressure on the antiferromagnetic-ferromagnetic transition and magneto-functional properties in Hf_(1-x)Ta_(x)Fe_(2)alloys

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Tungsten 2023年第4期5卷 503-511页

作者： feng-hua chen Hai-Bo Xie Ming-Shuai Huo Hui Wu Lian-Jie Li Zheng-Yi Jiang School of Mechanical MaterialsMechatronic and Biomedical EngineeringUniversity of WollongongWollongongNSW2522Australia The Key Laboratory of Magnetic and Electric Functional Materials and Applications of Shanxi Province Taiyuan University of Science and TechnologyTaiyuan030024China

In this study,the thermal expansion of Hf_(1-x)Ta_(x)Fe_(2)(x=0.10,0.13,0.15)compounds by adjusting the Ta concentration was successfully *** magnetocaloric properties,hydrostatic pressure affecting the antiferromagnetic-ferromagnetic transition,and magnetostriction in the low magnetic field were ***ΔS_(M)values of 3.3 J·(kg-K)^(-1)and 3.6 J·(kg·K)^(-1)were obtained under magnetic fields of 10 kOe and 15 kOe in the Hf_(0.85)Ta_(0.15)Fe_(2),*** the antiferromagnetic-ferromagnetic state transformation process under hydrostatic pressure up to 0.8 GPa,the state temperature does not decrease in a strictly linear *** magnetostrictive properties of 0.12%were obtained at a magnetic field of 10 *** kind of alloy is supposed to be controlled under hydrostatic pressure to obtain good magnetic refrigeration performance and magnetostrictive properties.

关键词： Magnetoelastic transition Magnetocaloric effect Hydrostatic pressure Hf1-xTaxFe2 compounds Magnetostriction

Establishing the lower limits of total serum testosterone among Chinese proven fertile men who received treatment of assisted reproductive technology

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Asian Journal of Andrology 2020年第4期22卷 396-400页

作者： Hui-Yu Xu Hui Jiang Guo-Shuang feng Ying feng Yong Han Wen-Hao Tang Hong-Xian Zhang feng-hua chen Hong-Xia Zhang De-feng Liu Rong Li Jie Qiao Center for Reproductive Medicine Department of Obstetrics and GynecologyPeking University Third HospitalBeijing 100191China Key Laboratory of Assisted Reproduction(Peking University) Ministry of EducationBeijing 100191China National Clinical Research Center for Obstetrics and Gynecology Beijing 100191China Beijing Key Laboratory of Reproductive Endocrinology and Assisted Reproductive Technology Beijing 100191China Department of Urology Peking University Third HospitalBeijing 100191China Center for Clinical Epidemiology and Evidence-Based Medicine Beijing Children's Hospital Capital Medical UniversityNational Center for Children's HealthBeijing 100045China Clinical Research Institute Zhejiang Provincial People's HospitalHangzhou 310014China

Testosterone(T)plays a crucial role in spermatogenesis because extremely low levels of intratesticular T lead to correspondingly low serum levels of total T(tT),severe disorders of spermatogenesis,and male ***,there is little consensus on the lower limits of serum tT in proven fertile men undergoing assisted reproductive technology treatments in Chinese or other Asian *** aimed to establish the reference range of serum tT based on a population of 868 fertile Chinese men undergoing in vitro fertilization or intracytoplasmic sperm injection and embryo transfer(IVF/ICSI-ET)*** defined a fertile man as having had a live baby with his partner as recorded in our IVF registration *** lower limits of serum tT were established using a Siemens IMMULITE 2000 chemiluminescent *** 1st,2.5th,and 5th percentiles and their 95%confidence intervals(CIs)were 3.6(95%CI:2.7–4.1)nmol l−1,4.3(95%CI:4.1–5.0)nmol l−1,and 5.6(95%CI:4.8–5.8)nmol l−1,*** the linear correlation of serum tT between the Siemens platform and a liquid chromatography–tandem mass spectrometry platform,the calculated lower limits of serum tT were also established for fertile Chinese men undergoing IVF/ICSI-ET treatments,which will benefit the clinical diagnosis and treatment of male infertility during such procedures.

关键词： chemiluminescence fertile men in vitro fertilization or intracytoplasmic sperm injection and embryo transfer liquid chromatography-tandem mass spectrometry lower reference limits serum total T

Coexistence of All-Order Topological States in a Three-Dimensional Phononic Topological Crystalline Insulator

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Research 2024年第2期2023卷 511-518页

作者： hua-Shan Lai Hao chen Chu-Hao Xia Si-Yuan Yu cheng He Yan-feng chen National Laboratory of Solid State Microstructures&Department of Materials Science and Engineering Nanjing UniversityNanjng 210093China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjng 210093China Jiangsu Key Laboratory of Artificial Functional Materials Nanjing University Nanjing 210093China

Classical-wave topological materials lacking intrinsic half-integer spins are less robust while more ***,we explore a single 3-dimensional phononic topological crystalline insulator that simultaneously exhibits a whole family of first-order quadratic surface,second-order hinge,and third-order corner states within the same *** a topological crystalline insulator hosting all-order phases originates from the different topological nature when hierarchically projected onto different facets and lower dimensions,thus free from trivial cladding *** work offers an ideal platform for either robust wave propagation or localization in on-demand dimensions and may facilitate dimension division multiplexing technology.

关键词： topological dimensions crystalline