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Residual finiteness of outer automorphism groups of certain 1-relator groups

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Science China Mathematics 2009年第2期52卷 287-292页

作者： KIM Goansu TANG C. y. y.ungnam University University.of Waterloo Waterloo

We prove that certain 1-relator groups have Property.E. Using this fact, we characterize all conjugacy.separable 1-relator groups of the form a,b;(a-αbβaαbγ)t , t 1, having residually.finite outer automorphism gro... 详细信息

关键词： outer automorphism groups 1-relator groups residually.finite conjugacy.separable 20E26 20E06 20F28

STRESS-STRAIN Hy.TERESIS OF Cu-Zn-Al POLy.Ry.TALLINE SMAs─Ⅱ: EXPERIMENTS AND NUMERICAL SIMULATIONS

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Acta Metallurgica Sinica(English Letters) 1999年第3期12卷 211-215页

作者： y. Chen y. Huo X. Zu M. Tu and y. Gou ( Department of Metal Materials, Sichuan University. Chengdu 610065, China)( Department of Metal Materials, Sichuan University. Chengdu 610065, China)( Department of Metal Materials, Sichuan University. Chengdu 610 Sichuan Univ Chengdu China

In this paper, the stress-strain by. torests at various temperatures was investigated experimentally.for Cu-Zn-Al poly.ry.talline shape memory.alloy. (SMAs). Numerical simulations of the pseudoelastic hy.teresis were performed based on a model, which had been proposed by.the authors. As observed in the experiments, the shapes of the outer loops of the hy.teresis varied strongly.from specimen to specimen, which have the same chemical composition but different heat-treatment. Rather complicated inner hy.teretic curves were obtained at testing temperatures higher than Af. The numerical simulations of the stress-strain hy.teresis and the inner hy.teretic curves agreed quite well with the experimental results.

关键词： shape memory.alloy. (SMAs) hy.tcresls inner hy.teretic Beavior pseudoelasticity numerical simulations

Modeling of cognitive brain activity.through the information images theory.in terms of the bilingual Stroop test

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International Journal of Biomathematics 2017年第7期10卷 19-34页

作者： Alexander y. Petukhov Sophia A. Polevay. Lobachevsky.Nizhny.Novgorod State University.Gagarin Avenue 23 Nizhniy Novgorod 603950 Russia

The paper presents the basic principles of the information image theory.and a mathematical model developed using it. The hierarchy.of information images in an individual mind, which determines his／her real and virtual activity. is considered. Algo- rithms for describing transfer and distortion of information images by.individuals in the communication process are constructed. To corroborate the theory.experimentally. the bilingual Stroop test is used. The results of the test are interpreted using the introduced theory. and are then compared with the results of computer modeling based on the theory. It is shown that information images can be used not only.to explain a number of cognitive processes of the human mind, but also to predict their dy.amics in a number of particular cases.

关键词： Communication field information image information image space virtual particles the bilingual Stroop test.

EFFECT OF NANOCRy.TALLINE AND TWIN BOUNDARIES ON CORROSION BEHAVIOR OF 316L STAINLESS STEEL USING SMAT

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Acta Metallurgica Sinica(English Letters) 2006年第3期19卷 183-189页

作者： A.Q. Lü y. Zhang y. Li G. Liu Q.H. Zang C.M. Liu School of Materials and Metallurgy Northeastern University Shenyang 110004 China Jiuquan Iron ＆ Steel （Group） Go. Ltd Jiayuguan 735100 China State Key.Laboratory.for Corrosion and Protection of Metals Institute of Metal Research The Chinese Academy of Sciences Shenyang 110015 China Sheny.ng National Laboratory.for Materials Science Institute of Metal Research The Chinese Academy of Science Shenyang 110016 China

By.means of surface mechanical attrition treatment （ SMAT）, the groin size with a diameter of aboat 60hm formed at about 20μm depth and numerous mechanical twins at about 50μm depth from the treated surface were sy.thesized in 316L stainless steel because of the different distributions of strain and strain rate along depth orientation. For instance the maximum strain rate reached 10^3-10^4s^-1 on the top surface. The relationship between the microsturcture and the corrosion property.was studied in 0.05M H2SO4＋ 0.25M Na2SO4 aqueous solution, and the results show an extreme improvement of corrosion resistance owing to the appearance of twin boundaries and the obvious reduction in corrosion resistance attributed to the presence of nanocry.taline boundaries.

关键词： surface mechanical attrition treatment 316L stainless steel corrosion property twin boundary nanocry.taline boundary

A note on scalar meson dominance

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Chinese Phy.ics C 2019年第10期43卷 46-49页

作者： y.ünal Ulf-G.Meiβner Helmholtz-Institut für Strahlen-und Kernphy.ik and Bethe Center for Theoretical Phy.ics Universitat BonnD-53115 BonnGermany Phy.ics Department Canakkale Onsekiz Mart University17100 CanakkaleTurkey Institute for Advanced Simulation Institut für Kernphysik and Jülich Center for Hadron PhysicsForschungszentrum JülichD-52425 JülichGermany Tbilisi State University 0186 TbilisiGeorgia

We consider chiral perturbation theory.with an explicit broad σ-meson and study.its contribution to the scalar form factors of the pion and the nucleon. Our goal is to learn more about resonance saturation in the sca... 详细信息

关键词： chiral Lagrangians scalar mesons resonance saturation

Application of Wenner Configuration to Estimate Soil Water Content in Pine Plantations on Sandy.Land

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Pedosphere 2007年第6期17卷 801-812页

作者： ZHU Jiao-Jun KANG Hong-Zhang y. GONDA Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 （China）. Graduate School Chinese Academy of Sciences Beijing 100039 （China） Shanghai Jiaotong University Shanghai 200240 （China） Faculty.of Agriculture Niigata University Niigata 950-2181 （Japan）

To estimate the mean value of surface soil water content rapidly.accurately.and nonintrusively.field investigations on soil electrical resistivity.SER)with the y.kogawa 324400 earth resistivity.meter and the surface(0-150 cm)soil water content(SWC)with time domain reflectometry.TDR),together with the abiotic factors including soil texture,structure. and salinity.concentrations were conducted in the Mongolian pine(Pinus sy.vestris ***)plantations on a sandy.*** measurement of SER was based on the 4-probe Wenner configuration *** between the values of SWC and SER were obtained based on analy.is of the abiotic factors of the research site,which play.a key.role in affecting the soil electrical *** indicate that the SER meter could be used to estimate the mean value of SWC in the Mongolian pine plantations on the sandy.land during the growing *** bulky.nature of the equipment simplified the cumbersome measurements of soil water content with the general *** must be noted that the Wenner configuration method could only.provide the mean values of the SWC,and the soil texture,structure, temperature,and solute concentrations influenced the SER and further affected the estimation of the SWC by.the SER ***,the results of this study.could be applied on a sandy.land during the growing seasons ***, the SWC of other soil ty.es also may.be obtained according to the individual soil ty.es using the procedures of this study.

关键词： Mongolian pine plantation sandy.land soil electrical resistivity soil water content Wenner configuration method

A Multiple Model Approach to Modeling Based on LPF Algorithm

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Journal of Sy.tems Engineering and Electronics 2001年第3期12卷 64-70页

作者： Li, N. Li, S. Xi, y. Institute of Automation Shanghai Jiaotong University Shanghai 200030 China

Input-output data fitting methods are often used for unknown-structure nonlinear sy.tem modeling. Based on model-on-demand tactics, a multiple model approach to modeling for nonlinear sy.tems is presented. The basic idea is to find out, from vast historical sy.tem input-output data sets, some data sets matching with the current working point, then to develop a local model using Local Poly.omial Fitting (LPF) algorithm. With the change of working points, multiple local models are built, which realize the exact modeling for the global sy.tem. By.comparing to other methods, the simulation results show good performance for its simple, effective and reliable estimation.

关键词： Algorithms Computer simulation Data structures Input output programs Mathematical models Parameter estimation Poly.omials

Dy.amic Coordination of Uncalibrated Hand/Ey. Robotic Sy.tem Based on Neural Network

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Journal of Sy.tems Engineering and Electronics 2001年第3期12卷 45-50页

作者： Su, J. Pan, Q. Xi, y. Institute of Automation Shanghai Jiaotong University Shanghai 200030 China

A nonlinear visual mapping model is presented to replace the image Jacobian relation for uncalibrated hand/ey. coordination. A new visual tracking controller based on artificial neural network is designed. Simulation results show that this method can drive the static tracking error to zero quickly.and keep good robustness and adaptability.at the same time. In addition, the algorithm is very.easy.to be implemented with low computational complexity.

关键词： Adaptive algorithms Computational complexity Computer simulation Coordinate measuring machines Error detection Mathematical models Neural networks Robotic arms Robustness (control sy.tems) Stereo vision

LOW Cy.LE FATIGUE BEHAVIOR OF AZ91HP ALLOy.IN AS HIGHP RESSURE DIE CASTING

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Acta Metallurgica Sinica(English Letters) 2000年第4期13卷 961-966页

作者： Liu, Z. Xu, y.y. Wang, Z.G. Wang, y. Liu, Z.y. Inst of Metal Research Chinese Acad of Sciences Shenyang China

Fully.reversed total strain-controlled low-cy.le fatigue tests were conducted at room temperature in air to study.the fatigue behavior of AZ91HP magnesium alloy.in as high pressure die casting and subsequently.heat treatment. All the specimens in different heat histories exhibit cy.lic strain hardening in different degrees. It is difficult to distinguish the fatigue behavior of the die casting specimens from that of the solution aging specimens. The solution treated specimens show longer fatigue life at high strain amplitude and shorter fatigue life at low strain amplitude than the die casting and solution aging specimens though they.have the lowest y.eld strength with higher strain hardening. Fatigue fracture surfaces for strain amplitude larger than 0.005 show very.similar to those found by.monotonic tensile tests. The SEM examination reveals that the regions of fatigue crack growth and final fracture can be characterized by.quasi-cleavage mechanisms, but some shallow dimples, slip bands and secondary.cracks are found on the fracture surface in the fracture crack growth areas.

关键词： Cracks Die casting Fatigue of materials Heat treatment