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Microstructure and properties of W-4.9Ni-2.1Fe heavy alloy with Dy2O3 addition

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Rare Metals 2019年第8期38卷 746-753页

作者： Yuan-Feng Xie Liang-Liang zhou xiao-Yong Zhang xiao-Xian Li Zeng-Lin zhou Xue-hui Zhang Institute of Engineering and Technology General Research Institute for Nonferrous Metals Beijing 100088China School of Materials Science and Engineering Jiangxi University of Science and Technology Ganzhou 341000China

The W-4.9 Ni-2.1 Fe-xDy2 O3 heavy alloy was fabricated by high-energy ball milling and spark plasma sintering(SPS)technique,and the microstructure,mechanical and friction behavior and anti-corrosion ability were investigated by scanning electron microscope(SEM),Rockwell hardness tester,X-ray diffraction(XRD),reciprocating friction and wear tester,electrochemical station,*** results show that the trace Dy2 O3 particles,which mainly distributes in the W-M(tungsten-matrix)interface and the tungsten matrix phase,can dramatically decrease the tungsten grain size and the amount of O and P impurities aggregating in the interface,promote the γ-(Ni,Fe)bonding phase and tungsten particles uniform distribution,and increase the relative density,hardness,and wear and corrosion resistance *** the excessive Dy2 O3 addition can make the inhibition effect weaken,resulting in the decrease in the comprehensive performances of the ***,the amount of Dy2 O3 should be *** the adding amount of Dy2 O3 particles is 0.7 wt%,the comprehensive performances of the heavy alloy are the best.

关键词： Dysprosium oxide W-4.9Ni-2.1Fe alloy Spark plasma sintering Mechanical property Anticorrosion ability

Removing Cd^(2+) by Composite Adsorbent Nano-Fe_3O_4/Bacterial Cellulose

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Chemical Research in Chinese Universities 2011年第6期27卷 1031-1034页

作者： LU Min GUAN xiao-hui WEI De-zhou School of Chemical Engineering Northeast Dianli University Jilin 132012 P. R. China School of Resources ＆ Civil Engineering Northeastern University Shenyang 110004 P. R. China

A new composite adsorbent, nano-Fe3O4/bacterial cellulose（BC）, was prepared through blending method. The process of adsorbing Cd2＋ including its isotherm and kinetics measured was studied. The results show that the adsorption efficiency is improved because of huge surface area and surface coordination of nano-Fe3O4 particles. Its adsorption capacity is 27.97 mg/g and the maximum of Cd2＋ removal is 74%. The adsorption kinetics can be described by pseudo-second rate model and the adsorption equilibrium by Langmuir type. The superparamagnetism of nano-Fe3O4 particles can help to solve the difficult separation of single BC adsorbent and lead to the quick separation of composite adsorbent from the liquid if a magnetic field was applied. Cd2＋ can be desorbed effectively by EDTA and HCl from the composite adsorbent, which can make it be reused.

关键词： Nano-Fe3O4 Bacterial cellulose Composite adsorbent Cadmium ion

Influence of Nano-Ceria Sol-Gel Coating on Oxidation Behavior of Chromium at 1000 ℃

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Journal of Iron and Steel Research International 2009年第6期16卷 80-85页

作者： JIN hui-ming zhou xiao-wei ZHANG Lin-nan College of Mechanical Engineering Yangzhou University Yangzhou 225009 Jiangsu China College of Environmental Science and Engineering Peking University Beijing 100010 China

Isothermal oxidation behavior of chromium with and without nanon sol-gel CeO2 coating is studied at 1 000 ℃ in air. Scanning electron microscopy （SEM） and transmission electron microscopy （TEM） are used to examine the surface morphology and microstructure of the oxide films. It is found that ceria coating greatly improves the anti-oxidation property of chromium. Laser Raman spectrometer and X-ray diffraction spectrometer （XRD） are also used to study the stress level in oxide films formed on ceria-coated and ceria-free Cr. Secondary ion mass spectrometer （SIMS） is used to examine Cr, O and Ce element distribution in depth in oxide films. Results show that nano-ceria application greatly reduces the growth speed and grain size of Cr2O3 film, and this fine grained Cr2O3 film probably has better high temperature plasticity, i. e. , oxide film relieves part of the compressive stress by means of creeping. Meanwhile, CeO2 changes the oxide film growth mechanism from predominant cation outward diffusion to anion inward diffusion. XRD and Raman testing results both show the stress declination effect due to nano-CeO2 application, and their discrepancy in the rare earth effect is analyzed.

关键词： nano-coating sol-gel rare earth element oxidation stress

Effect of DC-CIK cell on the proliferation,apoptosis and differentiation of leukemia cells

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Asian Pacific Journal of Tropical Medicine 2014年第8期7卷 659-662页

作者： hui-Qing Qu xiao-Sheng zhou xiao-Long zhou Jian Wang Department of Blood Transfusion Affiliated Hospital of Binzhou Medical College Department of Neurology Affiliated Hospital of Binzhou Medical College Pharmaceutical Department Affiliated Hospital of Binzhou Medical College Laboratory Department Affiliated Hospital of Binzhou Medical College

Objective:To observe the effect of co-culture cytokine-induced killer cells(CIK) and homologous dendritic cells(DC) on the proliferative activity and phenotype change of the DCCIK cell and the cell killing activity of leukemia ***:50 mL cord blood sample was obtained from infants delivered by full term healthy woman and the cord blood mononuclear cells were isolated by density gradient centrifugal ***-adherent cells were collectedfor the induction culture of *** cells were differentiated into mature DC;cultured mature DC was mixed with and CIK in the proportion of 1:5 for 12 *** activity of DC-CIK co-cultured cell on leukemia HL-60 was detected by MTT ***:Compared with *** cocultured DC-CIKs presented a markedly higher proliferation and killing ***:Co-culture of DC-CIK cells led to a significant increase of the proliferation and cytotoxicity of CIK.

关键词： Fetal blood Dendritic cells Adoptive immunotherapy HL-60 Immunotherapy Adoptive

Immune Responses to Trichloroethylene and Skin Gene Expression Profiles in Sprague Dawley Rats

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Biomedical and Environmental Sciences 2006年第5期19卷 346-352页

作者： xiao-YAN CHEN ZHI-XIONG ZHUANG xiao-hui WANG JIN-zhou ZHANG Shenzhen Futian People＇s Hospital Shenzhen 518033 Guangdong China Shenzhen Control and Prevention Shenzhen 518020 Guangdong China

Objective To characterize the immune reaction in SD rats exposed to trichloroethylene （TCE） and to identify the gene expression profiles involved in skin after TCE exposure. Methods Fifteen percent of TCE was injected intradermally into the rat back （100 μL/120 g） at intervals of 7 days. Whole blood was collected 24 h after the fifth or seventh intradermic administration of TCE. The percentages of CD4＋ and CD8＋ of T lymphocytes were measured by a flow cytometer. The concentrations of IFN-gamma and 1L-4 in the serum were semi-quantified by ELISA. Total RNAs of skin samples at 3 h or 24 h after the seventh dose of TCE in SD rats were extracted, and gene expression proftles of these tissues were analyszed by rat toxicology U34 array of Affymetrix. Results Obvious decline of CD4＋ in T lymphocytes was observed in the TCE-administer group. No significant concentration differences in IFN-gamma and IL-4 were found between TCE-treated and control rats. Gadd45a and Mel were significantly up regulated in skin tissue 24 h after TCE exposure. The expression regulation of immune response factors was as active as proteins associated with lipid metabolism and synthesis process in these skin samples of SD rats exposed to TCE. Conclusion T-helper type 1 cells mediate immune response can not be elicited in TCE-treated SD rats, but certain immune disorder can be induced.

关键词： Trichloroethylene SD rat CD4+/CD8+ IFN-gamma IL-4 Gene expression profiles

Reflection and Refraction of Waves Across an Interface of Two-phase Flow

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Acta Mathematicae Applicatae Sinica 2021年第1期37卷 137-147页

作者： Kai HU hui KAN Chun-lei TANG xiao-zhou YANG School of Mathematics and Statistics Southwest UniversityChongqing 400715China Wuhan Institute of Physics and Mathematics Chinese Academy of SciencesWuhan 430071China

We investigate a hyperbolic system of one-dimensional isothermal fluid with liquid-vapor phase *** refraction-reflection phenomena are intensively analyzed when elementary waves travel across the two-phase *** apply the characteristic method and hodograph transform of Riemann to reduce the nonlinear PDEs to a concise *** for the case of incident rarefaction wave,reduced linear equations are convenient to solve by Laplace *** an integral formula in wave interaction region is derived in this paper,instead of the hypergeometric functions solutions for non-isothermal polytropic *** is also observed that when incident waves travel from the vapor phase to the liquid phase,the refracted waves must be accelerated and move forward.

关键词： p-system two-phase fluid Hodograph transform Volterra equation

Local environment regulation of transition metal dichalcogenide-based single-atom catalysts

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Rare Metals 2024年第9期43卷 4019-4037页

作者： Ming-hui Li Jing Li xiao-Yu Zheng Yao zhou Advanced Research Institute of Multidisciplinary Science and School of Chemistry and Chemical Engineering Beijing Institute of TechnologyBeijing 100081China Laser Micro/Nano Fabrication Laboratory School of Mechanical EngineeringBeijing Institute of TechnologyBeijing 100081China

Single-atom catalysts have risen significant attention in the realm of green electrocatalytic energy conversion to address energy and environmental sustainability *** metal dichalcogenide(TMD)-based single-atom catalysts are considered highly effective in electrocatalysis due to the TMDs'notable specific surface area,tunable elemental species and efficient utilization of single *** order to enhance electrocatalytic performance,it is imperative to elaborately engineer the local environment surrounding the active sites of single atoms within *** this review,we initially explore the effects of synthesis methods on single-atom active sites and the influence of loading of single atoms on catalytic performance for *** modulation strategies of the local environment surrounding single-atom sites in TMDs are elaborated,including substitution engineering,surface adsorption,vacancies,spatial confinement and dual-atom site *** each modulation strategy,the effects of diverse local environments on various electrocatalytic applications are presented,such as the oxygen evolution reaction,oxygen reduction reaction,nitrogen reduction reaction,CO_(2)reduction reaction and CO ***,this study presents a comprehensive overview of the challenges encountered and the potential directions for the advancement of single-atom catalysts based on TMDs in the realm of electrocatalysis.

关键词： Single-atom catalysts Transition metal dichalcogenide Local environment Electrocatalysis

Smooth Solution of Multi-dimensional Nonhomogeneous Conservation Law: Its Formula, and Necessary and Sufficient Blowup Criterion

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Acta Mathematicae Applicatae Sinica 2023年第1期39卷 17-27页

作者： Gao-wei CAO hui KAN Wei XIANG xiao-zhou YANG Wuhan Institute of Physics and Mathematics Chinese Academy of SciencesInnovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430071China City University of Hong Kong Hong KongChina

In this paper, we are concerned with the necessary and sufficient condition of the global existence of smooth solutions of the Cauchy problem of the multi-dimensional scalar conservation law with source-term,where the initial data lies in W1,∞(Rn) ∩ C1(Rn). We obtain the solution formula for smooth solution, and then apply it to establish and prove the necessary and sufficient condition for the global existence of smooth solution. Moreover, if the smooth solution blows up at a finite time, the exact lifespan of the smooth solution can be obtained. In particular, when the source term vanishes, the corresponding theorem for the homogeneous case is obtained too. Finally, we give two examples as its applications, one for the global existence of the smooth solution and the other one for the blowup of the smooth solutions at any given positive time.

关键词： global smooth solution blowup multi-dimensional conservation law solution formula

Thermal maturation as revealed by micro-Raman spectroscopy of mineral-organic aggregation (MOA) in marine shales with high and over maturities

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Science China Earth Sciences 2020年第10期63卷 1540-1552页

作者： Xianming xiao Qin zhou Peng CHENG Jian SUN Dehan LIU hui TIAN School of Energy Resources China University of Geosciences(Beijing)Beijing 100083China State Key Laboratory of Organic Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China

Laser Raman spectroscopy of organic matter in coals and sedimentary rocks has been increasingly investigated to assess thermal *** organic matter such as vitrinite and solid bitumen,as well as isolated kerogen are definitely selected for this purpose,but there has been no systematic report on the Raman spectral parameters directly based on mineral-organic aggregations(MOA)in *** this paper,the Raman spectral characteristics and parameters of MOA in two sets of marine shale samples from southern China with either different TOC contents(TOC=0.10–4.59%)or different maturities(BRo=1.71–4.57%)were *** was found that the Raman technique is very sensitive to the organic matter in *** the TOC content of the shales reaches about 0.60%,perfect Raman spectra with D and G bands derived from organic matter in MOAwere obtained,and the Raman parameters of MOA are in good agreement with those of its associated solid bitumen,and can indicate the thermal maturity just like those of solid *** the Raman parameters of MOA is a potential alternative way to estimate maturity levels of high and over mature shales,especially those lower Paleozoic and Precambrian shales that lack macerals suitable for reflectance or Raman measurements.

关键词： Marine shale Mineral-organic aggregation(MOA) Solid bitumen Raman parameter Maturity