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Three-dimensional porous CoNiO_(2)@reduced graphene oxide nanosheet arrays/nickel foam as a highly efficient bifunctional electrocatalyst for overall water splitting

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Tungsten 2020年第4期2卷 390-402页

作者： Zhi‑Yi Pan Zheng Tang yong‑Zhong zhan Dan Sun School of Materials Science and Engineering South China University of TechnologyGuangzhou 510641China Collaborative Innovation Center of Sustainable Energy Materials School of ResourcesEnvironment and MaterialsGuangxi Key Laboratory of Electrochemical Energy MaterialsGuangxi UniversityNanning 530004China College of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China

It is crucial to develop high-performance and cost-effective bifunctional electrocatalysts for both oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)toward overall water ***,a unique heterostructure of reduced graphene oxide(rGO)and CoNiO_(2) nanosheets directly grown on nickel foam(NF)were successfully fabricated and applied as a kind of highly efficient bifunctional *** optimum CoNiO_(2)@rGO/NF electrode exhibits excellent elec-trocatalytic OER performance with an overpotential of only 272 mV to drive a current density of 100 mA·cm^(−2),and HER performance with an overpotential of 126 mV to achieve a current density of 10 mA·cm^(−2).Meanwhile,the electrodes also display outstanding long-term stability for OER and HER with negligible activity and morphology degradation after at least 40 h ***,when employed as both cathode and anode for overall water splitting,CoNiO_(2)@rGO/NF elec-trode only requires 1.56 V at 10 mA·cm^(−2) and operates stably for over 40 h,which is among the best performing Co-based and Ni-based non-precious metal *** characterizations reveal that the extraordinary electrocatalytic performance should be attributed to the synergistic effect of the unique heterostructure of CoNiO_(2) nanosheets and rGO for increasing the electrode conductivity and integrity,ultrasmall primary particle size for providing larger electrode/electrolyte contact area and abundant active sites,and three-dimensional(3D)conductive networks for facilitating the electrochemical reaction.

关键词： CoNiO_(2)@reduced graphene oxide arrays Bifunctional electrocatalyst Oxygen evolution reaction Hydrogen evolution reaction Water splitting

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Effects of Process Parameters of Semisolid Stirring on Microstructure of Mg–3Sn–1Mn–3SiC(wt%) Strip Processed by Rheo-rolling

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Acta Metallurgica Sinica(English Letters) 2017年第1期30卷 66-72页

作者： zhan-yong Zhao Ren-Guo Guan Jian-Hong zhang Zhou-Yang Zhao Pei-Kang Bai School of Materials Science and Engineering North University of China School of Materials Science and Engineering Northeastern University

A novel semisolid stirring and rheo-rolling process for preparing Mg-3Sn-1Mn-3SiC （wt%） composite strips was proposed, and the effects of process parameters of semisolid stirring on microstructures of Mg-3Sn-1Mn-3SiC （wt%） composite strips were investigated. The average grain size and roundness decrease, and the distribution of SiC becomes more homogeneous with the decrease in stirring temperature and the increase in the stirring speed. When the stirring time is increased, the distribution of SiC particles tends to be homogeneous, and the average grain diameter and roundness of α- Mg grain decrease. Under the following process parameters： the stirring temperature at 640 ℃, the stirring speed at 1100 rpm, the stirring time at 30 min and the roll speed at 0.2 m/s, Mg-3Sn-1Mn-3SiC （wt%） strip with a cross-sectional size of 4 mm × 160 mm was prepared. The ultimate tensile strength and elongation of Mg-3Sn-1Mn-3SiC （wt%） composite strip reached 226 ± 6 MPa and （7.4 ± 0.2）%, which are obviously improved in comparison with Mg-3Sn-1Mn （wt%）.

关键词： Mg-matrix composite Rheo-rolling Microstructure Property

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Mechanism of Annealing Softening of Rolled or Forged Tool Steel

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Journal of Iron and Steel Research International 2003年第1期10卷 40-43页

作者： LIU Zong-chang GAO zhan-yong DONG Xue-dong DAI Jian-ming Baotou University of Iron and Steel Technology Fushun Special Steel Ltd Co

The steel specimens of nominal composition 0.3C-1.0Cr-1.0Mn-2.0Si-1.0Ni- 0.04 Nb were quenched and tempered or isothermally quenched from various temperatures. It is found that the steel quenched and tempered with a tensile strength of 1 500-1 600 MPa has a K ISCC (critical stress intensity factor) value below 15.0 MPa·m 1/2 . The steel isothermally quenched with a tensile strength of 1 350-1 750 MPa has a K ISCC value about 20.0 MPa·m 1/2 . In addition, with increase of isothermal quenching temperature, the tensile strength decreases greatly and K ISCC value does not pronouncedly change. The microstructure of isothermally quenched specimens is composed of bainite and retained austenite. The delayed fracture resistance is dependent on the stability of austenite, which is in turn related to the retained austenite volume fraction and carbon content in austenite.

关键词： high strength steel heat treatment mixed microstructure delayed fracture

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Research advances of Legionella and Legionnaires’ disease

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Frontiers of Medicine 2010年第2期4卷 166-176页

作者： Xiao-yong zhan Chao-Hui HU Qing-Yi ZHU Guangzhou Kingmed Center for Clinical Laboratory Guangzhou 510330China

Legionella is a causative agent of legionellosis or Legionnaires’*** with Legionella *** an important cause of community and hospital-acquired ***,infection with Legionella is one of the most common causes of severe pneumonia in community settings,and Legionella is isolated in 40%of hospital-acquired pneumonia *** clinical features of legionellosis or Legionnaires’disease are not unique,which makes the diagnosis *** andﬂuoroquinolones are the most widely used drugs in *** recognition,treatment and effective measures for prevention and control of the disease are important and *** there have been a lot of methods for diagnosis of Legionella infection,they were often time-consuming or complex,not suitable for clinical *** review summarizes available information regarding the microbiology,taxonomy,epidemiology,pathogenesis and diagnosis of Legionnaires’disease,with an emphasis on the laboratory diagnosis of infection with Legionella spp.

关键词： Legionella Legionella pneumophila diagno-sis Legionnaires’disease

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Two-Quark Condensate Changes with Quark Current Mass

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Communications in Theoretical Physics 2009年第9期52卷 483-486页

作者： LU Chang-Fang LU Xiao-Fu WU Xiao-Hua zhan yong-Xin Department of Physics Sichuan University Chengdu 610064 China Department of Physics Sichuan Agricultural University Ya＇an 625014 China Institute of Theoretical Physics The Chinese Academy of Sciences Beijing 100080 China CCAST （World Laboratory） P.O. Box 8730 Beijing 100080 China

Using the Schwinger Dyson equation and perturbation theory,we calculate the two-quark condensates forthe light quarks u,d,strange quark s and a heavy quark c with their current masses *** results show thatthe two-quark condensate will decrease when the quark mass increases,which hints the chiral symmetry may be restoredfor the heavy quarks.

关键词： quark current mass quark condensates QCD sum rule Schwinger-Dyson equation perturbation theory

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Research progress of STC2 in breast cancer

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Biophysics Reports 2021年第3期7卷 185-192页

作者： Xuezhi Niu yong zhan Suhua zhang Zixin Liu Chang Qu Key Laboratory of Hebei Province for Molecular Biophysics Institute of BiophysicsSchool of ScienceHebei University of Technology

Breast cancer ranks second in the list of most common cancers among women and brings the double burden of economy and health to women. Therefore, it is an urgent and necessary task to study the pathogenic mechanism and the treatment of breast cancer. Glycoprotein hormone is a kind of hormones to promote the growth and the development of cell and stanniocalcin 2(STC2) is one of *** has shown us a various expression of SCT2 in organs and tissues and it can regulate many different pathological and physiological processes. In addition, there are a lot of previous studies that indicated a close correlation between STC2 and the development and metastasis of many cancers, which infers STC2 can serve as biomarker of certain cancers. Until now, the effects of STC2 on breast cancer have been studied widely, but research findings demonstrated two different views, one view is that STC2 plays an oncogenic role and the other is the opposite. In this paper, it will summarize and evaluate the research data and results about mammalian STC2 on breast cancer.

关键词： Breast cancer Proliferation Metastasis Prognosis Invasion Stanniocalcin 2 (STC2)

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Current Reversal in a Flashing Correlation Ratchet

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Chinese Physics Letters 1999年第7期16卷 475-477页

作者： ZHAO Tong-jun zhan yong ZHUO Yi-zhong WU Xi-zhen Department of Applied Mathematics and Physics Hebei University of Technology Tianjin 300130 China Institute of Atomic Energy Beijing 102413 Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100080

A flashing correlation ratchet model is proposed,in which the transport of Brownian particles driven by additive colored noise of Ornstein-Uhlenbeck type in a flashing ratchet is studied by Monte Carlo *** stationary current vs the noise strength and the correlation time is obtained and *** a fixed rate of potential flashing,the novel phenomena of current reversal and reentry *** conditions for the occurrence of these phenomena are *** in fluence of the flipping rate is also *** finding might be relevant to the fact that the protein motors with similar structure can move in opposite directions on the same kind of microtubule.

关键词： directions noise Flash

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Mechanical Property Evaluation of GaAs Crystal for Solar Cells

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Chinese Physics Letters 2011年第8期28卷 202-205页

作者： JIN Min FANG yong-Zheng SHEN Hui JIANG Guo-Jian WANG zhan-yong XU Jia-Yue School of Materials Science and Engineering Shanghai Institute of TechnologyShanghai 200235

The mechanical properties of Si-doped(111)GaAs crystal for solar cells are investigated by means of a microindentation ***'microhardness Hv exhibits a nonlinear relationship with the applied *** the range of 0.1–1 kg,Hv is decreased from 5.59 GPa to 5.03 *** a phenomenon is explained on the basis of indenter *** Hv value can effectively be presumed by Kick's law,and Meyer's index n is calculated to be *** the fracture toughness Kc of the GaAs crystal,it also displays nonlinear behavior related to the applied load,which is caused by energy dissipation during the development process of cracks on the wafer.

关键词： technique toughness fracture

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Microstructure and properties of A2017 alloy strips processed by a novel process by combining semisolid rolling,deep rolling,and heat treatment

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International Journal of Minerals,Metallurgy and Materials 2013年第8期20卷 770-778页

作者： Ren-guo Guan Xiang Wang zhan-yong Zhao Wei-wei Wang Fu-rong Cao Chun-ming Liu College of Materials and Metallurgy Northeastern University

A novel short process for producing A2017 alloy strips with notable features of near net shape, saving energy, low cost, and high product performance was developed by combining semisolid rolling, deep rolling, and heat treatment. The microstructure and properties of the A2017 alloy strips were investigated by metallographic microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, tensile testing, and hardness measurement. The cross-sectional microstructure of the A2017 alloy strips is mainly composed of near-spherical primary grains. Many eutectic phases CuA12 formed along primary grain boundaries during semisolid rolling are crushed and broken into small particles. After solution treatment at 495℃ for 2 h the eutectic phases at grain boundaries have almost dissolved into the matrix. When the solution treatment time exceeds 2 h, grain coarsening happens. More and more grain interior phases precipitate with the aging time prolonging to 8 h. The precipitated particles are very small and distribute homogenously, and the tensile strength reaches its peak value. When the aging time is prolonged to 12 h, there is no obvious variation in the amount of precipitated phases, but the size and spacing of precipitated phases increase. The tensile strength of the A2017 alloy strips produced by the present method can reach 362.78 MPa, which is higher than that of the strips in the national standard of China.

关键词： aluminum alloys semisolid rolling heat treatment microstructure mechanical properties

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Model for Influences of Magnetic Fields on Intracellular Calcium Oscillations

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Communications in Theoretical Physics 2009年第7期52卷 168-172页

作者： zhanG Yu-Hong zhan yong ZHAO Tong-Jun CHEN Ya-Fei YUAN Chang-Qing School of Sciences Hebei University of Technology Tianjin 300130 China

Based on the model of the two calcium stores developed by Goldbeter, the influence of external magnetic field on the calcium concentration has been discussed. We believe that the cell membrane is a major site of interaction for extremely-low-frequency （ELF） electromagnetic fields, and the permeability of ions can be changed with the changing electromagnetic fields. It is shown that magnetic field initiates intraeellular calcium oscillation with a threshold in flux density, and that the calcium oscillations do not occur if the density of magnetic field is below the threshold. The results of theoretical calculation are consistent with that of the experiment. The intracellular free calcium concentrations of different cells exposed to the same magnetic fields are different from each other. It is indicated that the different behaviors such as oscillation, rise and invariability of calcium concentration are associated with the sort of cells.

关键词： calcium oscillation magnetic fields calcium concentration

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