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Distortion Regions near the Grain Boundary and Their Effects on Nanocrystalline materials

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Journal of materials Science & Technology 2000年第6期16卷 554-558页

作者： Lung C.W. Long K. Tian E.K. Liang Z.J. int. cent. for Mater. phys. Chinese Acad. of Sci. Shenyang 110015 China

The distortion regions near grain boundaries in α-Fe-C solid solution were studied by the use of int.rnal friction method. It is found that the total thickness of these regions is quite large though the thickness of real grain boundaries is usually very thin. It is also found that the smaller the grain size is, the thicker the total distortion region is got. A model for the structure of distortion regions near grain boundaries is proposed. Their effects on nanocrystalline materials are discussed.

关键词： Distortion Regions near the Grain Boundary and Their Effects on Nanocrystalline materials

PERIODIC SOLUTIONS FOR HAMILTONIANSYSTEMS IN A NONCONVEX POTENTIAL WELL

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Acta Mathematica Scientia 1992年第2期12卷 171-178页

作者：李树杰 int. cent. for Theo. phys. Trieste Italy Scuola int. Superiore di Studi Avanzati Trieste Italy

Recent.y there has been a considerable amount of work on the existence of Tperiodic solutions for Hamiltonian systems with singular potentials, (see [1]—[7],[10], [11], [13], [14]). In this paper we will study the ex... 详细信息

关键词： PERIODIC SOLUTIONS FOR HAMILTONIANSYSTEMS IN A NONCONVEX POTENTIAL WELL 门刀 Pro

THE DYNAMIC PROPERTIES FOR THE PROTEIN MOLECULAR SYSTEM

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Acta Mathematica Scientia 1993年第4期13卷 437-448页

作者：庞小峰 int. cent. for Mat. phys. Academia Sinica Shenyang 110015 China Dept. of phys. Southwest Inst. of Nationalities Chingdu 610041 China

In this paper, a new theory for the dynamic properties of protein molecular system have been proposed by means of the analysis of the characteristics of the collective excitations generated under the localized fluctuation and the deformation of structure of the protein. Some new results obtained from this study show that the Davydov theory is an approximate and disadvantegeous theory.

关键词： THE DYNAMIC PROPERTIES FOR THE PROTEIN MOLECULAR SYSTEM

Dislocation Velocity Exponent and the Strain Rate

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Journal of materials Science & Technology 2001年第3期17卷 363-366页

作者： Hongyan LIU and Xiaowei WANG int.rnational cent.r for material phys.cs, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China E-mail: liu@*** int.. cent. for Mat. phys. Inst. of Metal Res. Chinese Acad. of Sci. Shenyang 110016 China

The process of dislocation multiplication has been described hv chaos theory, trying to reveal the connection between the microstructures on the mesoscopic scale and the mechanical properties of material on the macroscopic scale. The relationship between the dislocation velocity exponent and the maximum of strain rate is given. The results obtained from logistic equation with exponent and the dislocation multiplication dynamic equation are compared. A scale law in one-dimension-map model with exponent is shown when the exponents of equations are changed.

关键词： Dislocation Velocity Exponent and the Strain Rate

Coating powder beds with liquids and foams based on viscous formulations using a twin screw mixer: A continuous process study

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PARTICUOLOGY 2024年第10期93卷 364-376页

作者： Manga, Mohamed S. Kontziampasis, Dimitrios Al-Maqdad, Mustafa Clifford, Sean Bakalis, Serafim York, David W. Univ Leeds Fac Engn & Phys Sci Sch Chem & Proc Engn Leeds LS2 9JT England Univ Leeds Sch Mech Engn Fac Engn & Phys Sci Leeds LS2 9JT England Univ Dundee Sch Sci & Engn Dundee DD1 4HN Scotland cent.South Univ Dundee Int Inst Tongzipo Rd Changsha 410013 Hunan Peoples R China Univ Newcastle Sch Engn Dept Chem Engn Newcastle Upon Tyne NE1 7RU England Univ Birmingham Sch Chem Engn Birmingham B15 2TT England Univ Nottingham Fac Engn Dept Chem Engn Nottingham NG7 2RD England

Coating with viscous formulations has been essential in numerous industries as it can be a means for providing functionalization, additional properties, as well as other benefits. However, there have been scarce studies that have investigated and proposed methodologies in literature. Continuous coating of powders with viscous liquids poses as a promising technology, which has been mentioned in some studies, but has not yet been thoroughly investigated. This paper employs the use of image processing and analysis, in combination with statistical analysis of particles to evaluate the effectiveness of foams and liquids as a means of coating powder beds. Two different sizes of twin screw mixers that are working in continuous operation are employed, and a new continuous foaming device is fabricated and used for the experiments of coating. The effect of materials and process parameters (as for example rotational speed, and flowrate) on the quality of coating are investigated. Image analysis is used to assess the coating quality. The results clearly showcase the potential of using twin screw mixers for coating purposes and not only for mixing. The hypothesis that using large bubble foams to improve the coating of viscous liquids on particles is proven correct, as they provide higher quality coatings compared to their equivalent liquids, when used in the twin screw mixer. Surprisingly, using a larger scale twin screw mixer, does not show a substantial effect on the mixing, regarding quality, however there is still a requirement for mix optimization for achieving scale-up of this process. These results provide a new pathway for coating powders with viscous formulations in industrial applications, requiring less energy and effort in this process, and can pave the way towards int.oducing more sustainable industrial methodologies for coating. (c) 2024 Chinese Society of Particuology and Institute of Process Engineering, Chinese Academy of Sciences. Published by Elsevier B.V. Thi

关键词： Powder coating Continuous processing Viscous liquid Foam Image analysis Positron emission particle traking (PEPT) EMISSION PARTICLE TRACKING GROWTH REGIME MAP WET GRANULATION ENCAPSULATION PENETRATION NUCLEATION

Enthalpies of Formation of Binary Transition hcp Metal Based Alloys Calculated by Analytic Embedded Atom Method Model

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Journal of materials Science & Technology 1999年第4期15卷 331-335页

作者： Zhang, BW Ouyang, YF Liao, SZ Jin, ZP Chinese Acad Sci Int Ctr Mat Phys Shenyang 110015 Peoples R China Hunan Educ Inst Dept Phys Changsha 410012 Peoples R China cent.S Univ Technol Dept Mat Sci & Engn Changsha 410083 Peoples R China

A simple analytic modified embedded atom method (MEAM) including a modified term for hcp metals has been developed from the MEAM applied to the fee and bcc metals. The enthalpies of formation of all binary alloy systems for eight transition hcp metals are calculated with the MEAM. The calculations are in agreement with the experimental data available and results calculated from the Miedema theory. One can conclude that our MEAM is also effective to apply to the hcp metals and their alloys.

关键词： Transition metal alloys