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Search Results: 1 - 10 of 11887 matches for " XIE Youqing "
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Alloy Gene Gibbs Energy Partition Function and Equilibrium Holographic Network Phase Diagrams of AuCu-Type Sublattice System  [PDF]
Youqing Xie, Xiaobo Li, Xinbi Liu, Yaozhuang Nie, Hongjian Peng
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2013, DOI: 10.4236/ijcns.2013.610045
Abstract: Taking AuCu-sublattice system as an example, we present two discoveries and a method. First, the alloy gene sequences are the central characteristic atom sequences in the basic coordination cluster sequences. Second, the transmission mode of the information about structures and properties of the alloy genes is described by the alloy gene Gibbs energy partition function. The most valuable method in the system sciences is “the whole obtained from a few parts”. We have established the alloy gene database and holographic alloy positioning system of the Au-Cu system, as well as alloy gene Gibbs energy partition function and equilibrium holographic network phase diagrams of the AuCu-type sublattice system. It means that a standard way for researchers to share predictive algorithms and computational methods may be produced during designing advanced alloys.
Alloy Gene Sequence Project and System Science Philosophy  [PDF]
Youqing Xie, Xiaobo Li, Xinbi Liu, Hongjian Peng, Yaozhuang Nie
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2017, DOI: 10.4236/ijcns.2017.1012019
Abstract: System Science Philosophy is a knowledge system constructed of universal principle and law sequences. Alloy gene is a characteristic atom existing in the center of coordination cluster and occupying the lattice point of a lattice cell, and carries holographic information about valence electron structure, physical and thermodynamic properties obtained by alloy gene theory. Alloy gene potential energy curve function has developed traditional atom pair interaction potential functions into many atoms’ interaction function associated with valence electron structure, bond length, bond energy, which makes alloy gene Gibbs energy function can be established. Alloy gene Gibbs energy transmissive function has developed traditional partition function. Its equilibrium and sub-equilibrium transmissive modes produce alloy holographic network positioning bank, which is operable platform to achieve transformation from “trial and error” method to the “whole obtained from a few part” law for getting advanced alloys. It has become possible to launch alloy gene sequence project.
Valence bond structure of Ta-W alloys

Xiaobo LI,Youqing XIE,

金属学报(英文版) , 2009,
Abstract: The valence bond structure of substitutional BCC based Ta-W alloys is studied using characteristic crystal(CC)theory.This theory is based on cluster statistics of random alloys.By studying the correlativity between energy and volume of the CC in Ta-W alloys,the valence bond structure of CC is determined by the energy and shape method.Then,following additive law of CC,the valence bond structure of Ta-W alloys is calculated.It is found that the outer shell valence electronic distribution of Ta-W alloys shows ...
Low temperature thermodynamic study of the stable and metastable phases of vanadium
XiaoBo Li,YouQing Xie,YaoZhuang Nie,HongJian Peng
Chinese Science Bulletin , 2007, DOI: 10.1007/s11434-007-0471-y
Abstract: The low temperature thermodynamics of the stable phase of vanadium has been assessed by the polynomial and Debye models from the experimental data available in literature. By means of the constrained nonlinear least squares curve fitting arithmetic, two sets of parameter values have been determined. Expressions of the thermodynamic functions C p(T) and G(T)-H (298.15 K) at 0–298.15 K are presented. The low temperature thermodynamics of the metastable phase of vanadium can only be extrapolated by the Debye model. The expression of the thermodynamic function C p(T) at 0–298.15 K is presented.
MICROSTRUCTURE AND PROPERTIES OF Au-Cu ALLOYS
Au-Cu合金的微观结构和性质

XIE Youqing,ZHANG Hiaodong,
谢佑卿
,张晓东

金属学报 , 1994,
Abstract: According to characteristic crystal theory of alloy phases established on the statistic thermodynamics and electronic theory of metals,a systematic analysis has been conducted on the Au-Cu system. The interaction equations of characteristic properties (energy and volume),electronic structures and their changing characters of characteristic atoms in the Au-Cu alloys have been determined. The theoretical values of heat of formation, mixing Gibbs free energy and lattice constant as a function of concentration are in good agreement with the experimental values.XIE
Mechanisms of invasive population establishment and spread of pinewood nematodes in China
BingYan Xie,XinYue Cheng,Juan Shi,QingWen Zhang,ShuMing Dai,Fei Xue Cheng,YouQing Luo
Science China Life Sciences , 2009, DOI: 10.1007/s11427-009-0071-y
Abstract: This paper summarizes the results of our study of the pinewood nematode (Bursaphelenchus xylophilus). By population genetic analysis, it was determined that there was no genetic bottle caused by the founder effect and genetic drift in the Chinese invasive population. Multiple invasions with large amounts of nematodes from different sources led to rich genetic diversity in the invasive population. Keeping high genetic diversity in the invasive process may be one of the genetic mechanisms in its successful invasion. By testing interspecies competition, it was shown that, with high fecundity and a strong competitive ability, B. xylophilus outcompeted the native species B. mucronatus in the natural ecosystem during the invasion process. Competitive displacement may be one of the ecological mechanisms of B. xylophilus’s invasion. In addition, an unequal interspecific hybridization with introgress was in favor of the invasive species which also accelerated the replacement of B. mucronatus by B. xylophilus. The structures, functions and evolutions of a few important genes that are closely related to the ecological adaptation of pinewood nematodes were studied to explore the molecular mechanism of its ecological adaptations. Further, the resistance and resilience mechanism of the pine ecosystem invaded by pinewood nematodes was also investigated. The results of these studies uncovered a portion of the genetic and ecological mechanisms of PWN’s successful invasion and laid a foundation for further study to obtain a comprehensive interpretation of the mechanisms of the nematode invasion. The results also provided a scientific basis for effectively controlling the occurrence and spread of pine wilt disease which is caused by nematodes. Various aspects requiring further investigation are considered.
Mechanisms of invasive population establishment and spread of pinewood nematodes in China

XIE BingYan,CHENG XinYue,SHI Juan,ZHANG QingWen,DAI ShuMing,CHENG Fei Xue &,LUO YouQing,

中国科学C辑(英文版) , 2009,
Abstract: This paper summarizes the results of our study of the pinewood nematode (Bursaphelenchus xylophilus). By population genetic analysis, it was determined that there was no genetic bottle caused by the founder effect and genetic drift in the Chinese invasive population. Multiple invasions with large amounts of nematodes from different sources led to rich genetic diversity in the invasive population. Keeping high genetic diversity in the invasive process may be one of the genetic mechanisms in its successful invasion. By testing interspecies competition, it was shown that, with high fecundity and a strong competitive ability, B. xylophilus outcompeted the native species B. mucronatus in the natural ecosystem during the invasion process. Competitive displacement may be one of the ecological mechanisms of B. xylophilus’s invasion. In addition, an unequal interspecific hybridization with introgress was in favor of the invasive species which also accelerated the replacement of B. mucronatus by B. xylophilus. The structures, functions and evolutions of a few important genes that are closely related to the ecological adaptation of pinewood nematodes were studied to explore the molecular mechanism of its ecological adaptations. Further, the resistance and resilience mechanism of the pine ecosystem invaded by pinewood nematodes was also investigated. The results of these studies uncovered a portion of the genetic and ecological mechanisms of PWN’s successful invasion and laid a foundation for further study to obtain a comprehensive interpretation of the mechanisms of the nematode invasion. The results also provided a scientific basis for effectively controlling the occurrence and spread of pine wilt disease which is caused by nematodes. Various aspects requiring further investigation are considered. Supported by the National Key Basic Research and Development Program of China (Grant Nos. 2009CB119200 and 2002CB111400).
The method to determine characteristic atom sequences of binary alloy systems
确定二元合金系特征原子序列的方法

PENG Hongjian,XIE Youqing,
彭红建
,谢佑卿

金属学报 , 2008,
Abstract: In this paper, the method to determine characteristic atom sequences of binary alloy system was pointed out by taking Pt-Ru alloy system as an example. On the basis of lattice constants and heats of formation of experimental value, the energy and volume interaction optimum functions were chosen. The basic information of characteristic atom sequences was determined. The structures and properties of disordered and ordered alloy can be expounded and designed. The correlation between electronic structure and catalytic performance of Pt-Ru alloy was discussed. As the function of coordination of Ru, the potential energy decreases and stability increases. D-orbital vacancy increases and the lattice constants decrease. This lead to strengthen catalytic activity.
BORON OCCUPATION IN Ni_3Al ALLOY AND ITS SEGREGATION IN GRAIN BOUNDARY
Ni3Al合金硼原子占位及晶界偏聚

LI Weiming,ZHANG Yingjiu,TANG Renzhang,XIE Youqing,
李卫民
,张迎九,唐仁正,谢佑卿

材料研究学报 , 1996,
Abstract: According to the charateristic of tetrahedral and octahedral interstices in Ll2 intermetallic compound, the radii of those interstices have been calculated by the hard sphere model. It was found that in Ni3Al alloys, the 6Ni octahedral interstices in Ni-rich grain boundaries are large than that in Al-rich Ni3Al alloys. So a large amount of boron segregates in Ni-rich grain boundaries. Moreover,the interaction of atoms in Al-rich grain boundaries is stnonger than that in Ni-rich grain boundaries,which also prevents boron at oms from entering Al-rich grain boundaries.
First--Principles Study of the Thermal Properties of Metal Zr
金属Zr热力学性质的第一原理研究

NIE Yaozhuang,XIE Youqing,LI Xiaobo,PENG Hongjian,
聂耀庄
,谢佑卿 李小波,彭红建

金属学报 , 2007,
Abstract: A first-principles study of the thermal properties of hcp metal Zr using the pseudopo- tential plane-wave method in the framework of the density-functional theory and density-functional perturbation theory is reported.The phonon spectra and static total energies are calculated for Zr with different lattice parameters,and free energies at different temperatures are obtained in the quasihar- monic approximation according to the criterion of free energy minimum.The temperature-dependent coefficients of thermal expansion,bulk modulus and specific heat at constant volume(pressure)are presented.Calculated results for the thermal properties are in good agreement with the available ex- perimental data in a wide range of temperature.The coefficients of thermal expansion obtained from first-principles approach and Debye-Gr(?)neisen model are compared.The electronic contribution to the specific heat is found to be not negligible at high temperature.
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