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Synthesis,formation mechanism,and intrinsic physical properties of several As/P-containing MAX phases

Journal of Materials Science & Technology 2023年第2期133卷 23-31页

作者： Hongxiang Chen sheng Li Jun deng Zhilong Zhang Jianeng Huang Fa chang Li Huang Shixuan Du Pinqiang Dai School of Materials Science and Engineering Fujian University of TechnologyFuzhou 350118China Institute of Physics&University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100190China Fujian Provincial Key Laboratory of Advanced Materials Processing and Application Fuzhou 350118China Center for Advanced Energy and Functional Materials Fujian University of TechnologyFuzhou 350118China Songshan Lake Materials Laboratory Dongguan 523808China CAS Key Laboratory of Vacuum Physics Beijing 100049China

321 phases are an atypical series of MAX phases,in which A=As/P,with superior elastic properties,fea-turing in the MA-triangular-prism bilayers in the crystal *** now,besides Nb 3 As 2 C,the pure phases of the other 321 compounds have not been realized,hampering the study of their intrinsic ***,molten-salt sintering(MSS)and solid-state synthesis(SSS)were applied to synthesize As/P-containing 321 phases and 211 *** the phase composition of the end-product via multiple-phase Rietveld refinement,we found that MSS can effectively improve the purity of P-containing MAX phases,with the phase content up to 99%in Nb_(3)P_(2)C and 75.4(5)%in Nb 2 *** contrast,MSS performed poorly on As-containing MAX phases,only 8.9(4)%for Nb 3 As 2 C and 64(2)%for Nb 2 AsC,as opposed to the pure phases obtained by *** experimental analyses combined with first-principles calculations reveal that the dominant formation route of Nb_(3)P_(2)C is through NbP+Nb+C→Nb_(3)P_(2)***,we found that the benefits of MSS on P-containing MAX phases are on the facilitation of three consid-ered chemical reaction routes,especially on Nb 2 PC+NbP→Nb_(3)P_(2)***,the intrinsic physical properties and Fermi surface topology of two 321 phases consisting of electron,hole,and open orbits are revealed theoretically and experimentally,in which the electron carriers are dominant in electrical *** feasible synthesis methods and the formation mechanism are instructive to obtain high-purity As/P-containing MAX phases and explore new MAX ***,the intrinsic physical properties will give great support for future applications on 321 phases.

关键词： MAX phase Molten-salt synthesis Chemical reaction route Metallic ceramics Formation mechanism Quasi-harmonic approximation

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Ideality analysis and general laws of bubble swarm microflow for large-scale gas-liquid microreaction processes

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Chinese Journal of Chemical Engineering 2022年第10期50卷 56-65页

作者： Lin sheng Yuchao Chen Jian deng Guangsheng Luo The State Key Laboratory of Chemical Engineering Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

The flow ideality of bubbly microflow remains unclear even though it is vital for the design of microreactors,especially the ideality of bubble swarm microflow for large-scale gas-liquid microreaction *** work is the first time to report the ideality analysis of the microbubble swarm in a relatively large *** bubble swarm microflow has undergone two conditions:quasihomogeneous plug flow and liquid phase/gas-liquid qua si-homogeneous phase two-phase laminar *** the deviations of void fraction and bubble velocity from the ideal plug flow can divide into two parts,and the two transition points simultaneously happen at the velocity ratio of *** exists a critical capillary number to maintain the quasi-homogeneous plug flow,which could be regarded as the general laws for the design of gas-liquid ***,a novel model is developed to predict the bubble *** work could be very helpful for the large-scale gas-liquid microreactors design.

关键词： Bubble swarm Flow ideality Viscous fluids Gas-liquid microreactor

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Effects of Doped Elements on Electrochemical Performance of Ni(OH)_2 Materials

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Chemical Research in Chinese Universities 2007年第4期23卷 452-455页

作者： LEE chang-sheng School of Chemical Engineering and Technology Tianjin University

High energy ball milling （HEBM） method was applied to synthesize Ni （OH）2 with different doped elements sub-stitution for Ni^2＋. The morphology, structure and electrochemical behavior of prepared powders were studied. The re-suits reveal that all the synthesized Ni（OH）2 particles were in sub-micron sizes and greatly agglomerated. Co-, Mg-,Fe- or Mn-doped Ni （OH） 2 was of β-phase with 0.400-0.500 nm crystal interlayer distance, while A1- and Zn-doped products displayed a-phase with larger crystal interlayer spaces. The electrochemical mechanisms of synthe-sized Ni（OH）2 electrodes were discussed by EIS spectra. The specific capacity of Co-doped Ni （OH）2 is 245 mA·h · g^-1, i. e. , 60 mA· h · g^-1 higher than that of Al-doped electrode, which has the highest discharging plat-form of a mid-voltage of 1.30 V.

关键词： Nickel hydroxide High energy ball milling method Metallic ion adulteration Electrochemical discharging capacity

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LDL对绵羊精子冷冻保存效果的研究

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畜牧与饲料科学 2008年第4期29卷 29-31页

作者：宏伟倪利平田东海芦永跃邓常胜李金泉张小宇郑云胜内蒙古农业大学动物科学与医学学院内蒙古呼和浩特010018

绵羊冷冻精液的受精率低于自然交配,其原因之一可能是在冷冻过程中精子质膜损伤严重造成的。该研究以内蒙古细毛羊为试验动物,在稀释液中以低密度脂蛋白(LDL)代替卵黄。分析了冷冻过程中对精子活率、顶体完整率和质膜完整率的影响。筛... 详细信息

绵羊冷冻精液的受精率低于自然交配,其原因之一可能是在冷冻过程中精子质膜损伤严重造成的。该研究以内蒙古细毛羊为试验动物,在稀释液中以低密度脂蛋白(LDL)代替卵黄。分析了冷冻过程中对精子活率、顶体完整率和质膜完整率的影响。筛选出了最优的LDL稀释液配方,以提高绵羊精液质量,减少精子的损伤,为提高绵羊精子冷冻保存后的受精率提供理论依据。

关键词：绵羊精液低密度脂蛋白(LDL) 卵黄冷冻保存精子质量

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Phase field simulation of single bubble behavior under an electric field

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Chinese Physics B 2018年第9期27卷 389-395页

作者： chang-sheng Zhu Dan Han sheng Xu School of Computer and Communication Lanzhou University of Technology State Key Laboratory of Gansu Advanced Processing and Recycling of Non-Ferrous Metal Lanzhou University of Technology

Based on the Cahn-Hilliard phase field model, a three-dimensional multiple-field coupling model for simulating the motion characteristics of a rising bubble in a liquid is established in a gas-liquid two-phase flow. The gas-liquid interface motion is simulated by using a phase-field method, and the effect of the electric field intensity on bubble dynamics is studied without electric field, or with vertical electric field or horizontal electric field. Through the coupling effect of electric field and flow field, the deformation of a single rising bubble and the formation of wake vortices under the action of gravity and electric field force are studied in detail. The correctness of the results is verified by mass conservation, and the influences of different electric field directions and different voltages on the movement of bubbles in liquid are considered. The results show that the ratio of the length to axis is proportional to the strength of the electric field when the air bubble is stretched into an ellipsoid along the electric field line under the action of electrostatic gravity and surface tension. In addition, the bubble rising speed is affected by the electric field, the vertical electric field accelerates the bubble rise, and the horizontal direction slows it down.

关键词： electro-hydro dynamics numerical simulation phase field method bubble

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Conjugate Points on a Type of Kahler Manifolds

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Acta Mathematica Sinica,English Series 2013年第6期29卷 1175-1184页

作者： Wei Ming LIU Fu sheng deng Department of Mathematics and Physics Beijing Institute of Petrochemical Technology School of Mathematical Sciences Graduate University of Chinese Academy of Sciences

We study conjugate points on a type of Khler manifolds, which are submanifolds of Grassmannian manifolds. And then we give the applications to the study of the index of geodesics and homotopy groups.

关键词： Conjugate points Jacobi equation Khler manifolds

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Murine gammaherpesvirus-68 ORF38 encodes a tegument protein and is packaged into virions during secondary envelopment

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Protein & Cell 2014年第2期5卷 141-150页

作者： sheng Shen Haitao Guo Hongyu deng Chinese Academy of Sciences Key Laboratory of Infection and Immunity Institute of Biophysics Chinese Academy of Sciences Beijing 100101 China University of Chi'nese Academy of Sciences Beijing 100049 China

Tegument is the unique structure of a herpesvirion which occupies the space between nucleocapsid and envelope. Accumulating data have indicated that inter- actions among tegument proteins play a key role in virion morphogenesis. Morphogenesis of gam- maherpesviruses including Kaposi＇s sarcoma-associ- ated herpesvirus （KSHV） and Epstein-Barr virus （EBV） is poorly understood due to the lack of efficient de novo lytic replication in cell culture. Murine gammaherpesvi- rus-68 （MHV-68） is genetically related to these two human herpesviruses and serves as an effective model to study the lytic replication of gammaherpesviruses. We previously showed that ORF33 of MHV-68 encodes a tegument protein and plays an essential role in virion maturation in the cytoplasm. However, the molecular mechanism of how ORF33 participates in virion mor- phogenesis has not been elucidated. In this study we demonstrated that ORF38 of MHV-68 is also a tegument protein and is localized to cytoplasmic compartments during both transient transfection and viral infection. Immuno-gold labeling assay showed that ORF38 is only present on virions that have entered the cytoplasmic vesicles, indicating that ORF38 is packaged into virions during secondary envelopment. We further showed that ORF38 co-localizes with ORF33 during viral infection; therefore, the interaction between ORF38 and ORF33 is conserved among herpesviruses. Notably, we found that although ORF33 by itself is distributed in both the nucleus and the cytoplasm, in the presence of ORF38, ORF33 is co-localized to trans-Golgi network （TGN）, a site where secondary envelopment takes place.

关键词： gammaherpesvirus tegument protein,ORF38 ORF33 TGN

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Fridman’s Invariant, Squeezing Functions, and Exhausting Domains

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Acta Mathematica Sinica,English Series 2019年第10期35卷 1723-1728页

作者： Fu sheng deng Xu Jun ZHANG School of Mathematical Sciences University of Chinese Academy of Sciences

We show that if a bounded domain Ω is exhausted by a bounded strictly pseudoconvex domain D with C^2 boundary, then Ω is holomorphically equivalent to D or the unit ball, and show that a bounded domain has to be hol... 详细信息

关键词： Squeezing function Fridman's invariant exhausting domain

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Numerical Simulation of Temperature Field and Thermal Stress Field of Work Roll During Hot Strip Rolling

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Journal of Iron and Steel Research International 2007年第5期14卷 18-21页

作者： LI chang-sheng YU Hai-liang deng Guan-yu LIU Xiang-hua WANG Guo-dong State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110004 Liaoning China

Based on the thermal conduction equations, the three-dimensional （3D） temperature field of a work roll was investigated using finite element method （FEM）. The variations in the surface temperature of the work roll during hot strip rolling were described, and the thermal stress field of the work roll was also analyzed. The results showed that the highest roll surface temperature is 593 ℃, and the difference between the minimum and maximum values of thermal stress of the work roll surface is 145.7 MPa. Furthermore, the results of this analysis indicate that temperature and thermal stress are useful parameters for the investigation of roll thermal fatigue and also for improving the quality of strip during rolling.

关键词： hot strip mill roll temperature field thermal stress finite element method

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人肺癌细胞A549λ噬菌体cDNA文库的构建与鉴定

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西南医科大学学报 2021年第4期44卷 333-337页

作者：张红英郭嘉雯员月明徐志勇邓长生王琪广州中医药大学科技产业园广州510405 广州中医药大学青蒿研究中心广州510405

目的构建人肺癌细胞A549λ噬菌体cDNA文库,为抗肺癌药物的筛选和药物作用分子机理的研究奠定基础。方法提取人肺癌细胞A549λ总RNA,用DnaseⅠ处理后,采用RNA 5’末端移动反转录(switching mechanism at 5′end of RNA transcript,SMART... 详细信息

目的构建人肺癌细胞A549λ噬菌体cDNA文库,为抗肺癌药物的筛选和药物作用分子机理的研究奠定基础。方法提取人肺癌细胞A549λ总RNA,用DnaseⅠ处理后,采用RNA 5’末端移动反转录(switching mechanism at 5′end of RNA transcript,SMART)技术合成双链cDNA,切胶回收去除短片段,依次用蛋白酶K和SfiⅠ进行酶切,并与经过酶切的λTriplEx2载体连接后进行体外包装,得到初级文库。初级文库扩增后,测定扩增文库滴度,并通过PCR鉴定插入片段。结果构建的人肺癌细胞A549λ噬菌体初级文库库容为1.88×10^(7)pfu/mL,扩增文库滴度为2.50×10^(9)pfu/mL,插入cDNA片段为500~3000 bp。结论成功构建了人肺癌细胞A549λ噬菌体cDNA文库,为进一步筛选治疗肺癌的药物作用分子机理奠定了基础。

关键词：肺癌 λ噬菌体 cDNA文库 SMART

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