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Analysis Method for Predicting strain in Interior Beds and Sub-Resolution Faults from Area Balance Theory in Extensional Basins

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Journal of China University of Geosciences 2002年第4期13卷 313-320页

作者： Groshong Jr R H Department of Geological Sciences

Extensional basins include mainly grabens and half grabens displaced along a lower detachment. Based on area balance theory, there is a linear relationship between a height of regional and the lower detachment h on the outside of the basin and "lost area S " from the regional in the basin. The pre-growth beds above lower detachment are of the same extensional displacement so that an " S-h diagram" can be used to determine the depth to lower detachment and to calculate the total extensional displacement of the beds above the lower detachment. The extensional displacement is dominated by the heave of various scale normal faults. The displacement of obvious faults can be immediately figured out from the measured bed-length. The requisite extension calculated by area balance is the layer-parallel strain, which could be accommodated by displacement on sub-resolution faults. Accordingly, the layer-parallel strain can help us predict the magnitude and distribution of sub-resolution faults on the basis of analysis of the structural style and rheological behavior.

关键词： area balance, extensional strain, sub-resolution fault, graben, half graben, S-h diagram.

Proviral genomic sequence analysis of Chinese donkey leukocyte attenuated equine infectious anemia virus vaccine and its parental virus strain Liaoning

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Science China(Life Sciences) 2002年第1期45卷 57-67页

作者：王柳杨志彪王玫童光志仇华吉刘红全孔宪刚 National Key Laboratory of Veterinary Biotechnology Harbin Veterinary Research Institute Chinese Academy of Agricultural Sciences Harbin 150001 China

Proviral DNA was extracted from donkey leukocyte infected with Chinese donkey leukocyte attenuated equine infectious anemia virus(DLA-EIAV), and peripheral blood lymphocytes(PBL) from a horse infected with the virulent EIAV strain Liaoning(EIAV L). The entire proviral DNA from both viruses was cloned and sequenced. The lengths of complete genomic sequences of DLA-EIAV and EIAV L provirus were 8266 bp and 8235 bp, respectively. Sequence comparison indicated that DLA-EIAV shares 97.0% and 97.5% in sequence homology with EIAV L and donkey-adapted EIAV(DA-EIAV), respectively. Lots of variations occurred in long terminal repeat(LTR, consisting of U3, R, U5), ORF S2, and env regions between DLA-EIAV and EIAV L. The nucleotide sequence differences of the two viruses in U3, R, U5, ORF S2, and env are 13.2%, 7.5%, 5.1%, 3.9%, and 2.7%, respectively, and predicted amino acid sequence differences in env and S2 coding regions are 4.4% and 8.8%, respectively. Six conserved regions are characterized in Gp90. There is a cis-activating GATA motif in ENH of DLA-EIAV and EIAV L. Two N-linked glycosylation sites disappeared in DLA-EIAV Gp90 in comparison with that of EIAV L. A bHLH transcription factor binding consensus sequence was found in LTR of DLA-EIAV but not in EIAV L. Furthermore, there is a mutation in the stem of DLA-EIAV TAR resulting in formation of a uridine tuber. Further study is needed to uncover the relationship between sequence changes and their biological functions of DLA-EIAV and L.

关键词： equine infectious anemia virus(EIAV), donkey leukocyte attenuated(DLA) strain, L strain, sequence analysis.

A Finite-Element Analysis on the Rheorolling Process of Semi-Solid Spring Steel

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Journal of Materials Science & Technology 2003年第Z1期19卷 62-64页

作者： Hongbo DONG Yonglin KANG Department of Material Processing and Controlling University of Science and Technology Beijing Beijing 100083 China Department of Material Processing and Controlling University of Science and Technology Beijing Beijing 100083 China

With a geometrical model of porous material, a 3D finite-element analysis on the rolling process of spring steel60Si2Mn in the semi-solid state is carried out using software MARC. In terms of flat and groove rolling conditions,stress field and strain field are studied. The simulation results show that the rigid-viscoplastic model can accuratelydescribe the semi-solid metal rolling process. Semi-solid slurry has the characteristics of low flow stress and goodfluidity. During groove rolling, distribution of stress and strain on the cross-section of deformation zone is moreuniform than that during flat rolling. The results of simulation are in good agreement with the experiment data, andshow that semi-solid material fits for groove rolling.

关键词： Finite-element analysis, Stress, strain, Semi-solid metal

Molecular dynamics simulation of thermal conductivities of superlattice nanowires

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Science China(Technological Sciences) 2003年第3期46卷 278-286页

作者：杨决宽陈云飞颜景平 Department of Mechanical Engineering Southeast University

Nonequilibrium molecular dynamics simulations were carried out to investigate heat transfer in superlattice nanowires. Results show that for fixed period length superlattice nanowires, the ratio of the total interfacial thermal resistance to the total thermal resistance and the effective thermal conductivities are invariant with the changes in interface numbers. Increasing the period length leads to an increase in the average interfacial thermal resistance, which indicates that the interfacial thermal resistance depends not only on the materials that constitute the alternating segments of superlattice nanowires, but also on the lattice strain throughout the segments. The modification of the lattice structure due to the lattice mismatch should be taken into account in the acoustic mismatch model. Simulation results also demonstrated the size confinement effect on the thermal conductivities for low dimensional structures, i.e. the thermal conductivities and the inter-facial thermal resistance increase as the nanowire cross-sectional area increases.

关键词： thermal conductivity, superlattice, nanowire, strain, interfacial thermal resistance, molecular dynamics simulation.

Prediction Models on Distribution of Inherent strains in T Type Welding Structure

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Journal of Materials Science & Technology 2003年第Z1期19卷 202-204页

作者： Peng HE Jicai FENG Jiecai HAN Yiyu QIAN National Key Laboratory of Advanced Welding Production Technology HIT Harbin 150001 China National Key Laboratory of Advanced Welding Production Technology HIT Harbin 150001 China National Key Laboratory of Advanced Welding Production Technology HIT Harbin 150001 China National Key Laboratory of Advanced Welding Production Technology HIT Harbin 150001 China

A fundamental theory for the analysis of residual welding stresses and deformation based on the inherent strain distribution along the welded joint is introduced. The method of predicting maximum hardness Hv(y, z) and maximum inherent strain gmax is given. The model T.E.P-Tav-hardness calculation is proposed to predict distribution of inherent strains in T type welding structure. By T.E.P-Tav-hardness calculation, distribution of longitudinal inherent strains can be predicted in T type welding structure, and calculation and experimental results are consistent.

关键词： Inherent strain, Residual welding stresses, T type welding

Sequencing and analysis for the full-length genome RNA of foot-and-mouth disease virus China/99

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Science China(Life Sciences) 2004年第1期47卷 74-81页

作者： ZHANG Xiansheng LIU Zaixin ZHAO Qizu CHANG Huiyun XIE Qingge Department of Virology Lanzhou Veterinary Research Institute Chinese Academy of Agricultural Sciences(CAAS) Lanzhou 730046 China Department of Virology Lanzhou Veterinary Research Institute Chinese Academy of Agricultural Sciences(CAAS) Lanzhou 730046 China Department of Virology Lanzhou Veterinary Research Institute Chinese Academy of Agricultural Sciences(CAAS) Lanzhou 730046 China Department of Virology Lanzhou Veterinary Research Institute Chinese Academy of Agricultural Sciences(CAAS) Lanzhou 730046 China Department of Virology Lanzhou Veterinary Research Institute Chinese Academy of Agricultural Sciences(CAAS) Lanzhou 730046 China

The complete nucleotide sequence of genomic RNA of foot and mouth disease virus (FMDV) strain China/99 from infected bovine tongue epithelium is presented. The nucleotide sequence extending from the 5′ end of the genomic RNA to the 5′ end of poly (A) tail contains 8173 nucleotides (nt). Its open reading frame, which encodes a single polypeptide of 2332 amino acids, encompasses 6999 nt starting from the initiation codon AUG and terminating at the UAA codon 93 bases upstream from the 5′ end of poly (A) tract. The 5′ untranslated region (UTR) is composed of 1081nt. The consensus of the 1d gene of FMDV strain China/99 compared with that of UKG/6/2001, UKG/12/2001, China/99HN4 and China/3/Tibet is over 97%. The result showed the stains belong to the members of the Pan-Asia family. There is a remarkable differentiation in the function-unknown (FUR), p2 and p3 regions between FMDV isolates from infected cattle and swine, especially in 3a gene. No deletion was found in genes l, 1a, 1b, 2a, 2c, 3b, and 3d. These genes might be indispensable to the surviving of FMDV. The secondary structures of small (S) fragments, FUR and an internal ribosome entry site can be classified into three types, and the S fragment and 3′UTR of the positive-sense RNA fold into stem-loop structures similar to the shape of clover.

关键词： FMDV, China/99 strain, reference strains, genome, sequence analysis.

Study on cartilaginous and muscular strains of rat trachea

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Science China(Life Sciences) 2004年第6期47卷 485-493页

作者： TENG Zhongzhao1, LIU Zhaorong1, LIN Yihan1, WANG Yiqin2, LI Fufeng2 & GONG Keqin1 1. Department of Mechanics & Engineering Science, Fudan University, Shanghai 200433, China 2. Shanghai Traditional Medical University, Shanghai 200032, China Correspondence should be addressed to Teng Zhongzhao Department of Mechanics & Engineering Science Fudan UniversityShanghai 200433China Shanghai Traditional Medical University Shanghai 200032China

This paper introduces a new method, termed Twice Cutting, for obtaining the zero-stress states of cartilage and muscle of trachea. The method applied cuts at the two junc- tions of tracheal cartilage and muscle perpendicular to the tangent lines of cartilage at its tips. The cartilaginous and muscular opening angles are defined for the first time in Twice Cutting methods. Based on the analysis of cartilaginous and muscular geometric information in no-load and zero-stress states, it is found that there are compressive and tensile residual strains in the inner and outer walls of the cartilage respectively. Residual strains at the muscular inner wall of tracheal rings near bifurcation are negative, whereas those of other rings are positive, and re- sidual strains at outer wall of all rings are positive. This phenomenon of tracheal muscle residual strains is different from those of vessel etc. The results also show that the absolute values of cartilaginous strains are considerably smaller than that of muscular ones, with the ratio being around 0.05. The values of all the tracheal parameters, including residual strains and opening angles, are reducing with the increasing value of tracheal rings’ position. So the consequences obtained in this paper not only indicate that the trachea is a non-uniform tissue along the circumferential and axial directions, but also reveal the differences between the trachea and other living tissues, such as vessel, esophagus. This is a basic research for further work, such as determining stress in trachea, to which the cartilaginous and muscular zero-stress states should be referred.

关键词： trachea, residual strain, opening angle, remodeling.