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A spatial echinococcosis transmission model with time delays： Stability and traveling waves

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International Journal of Biomathematics 2017年第6期10卷 115-146页

作者： zhiting xu Cuihua Ai School of Mathematical Sciences South China Normal University Guangzhou 510631 P. R. China

In this paper, we derive a time-delayed and diffusive echinococcosis transmission model. We first address the well-posedness to the initial-value problem for the model and give the basic reproduction number TO0. In the case of a bounded spatial domain, we establish the local stability as well as the global stability of the disease-free and disease equilibria of the model. The methods to prove the local and the global stability are to analyze the corresponding characteristic equations and construct Lyapunov functionals, respectively. In the case of an unbounded spatial domain, by applying Schauder＇s fixed point theorem and the limiting arguments, we show that when R0 〉 1, there exists a constant c＊〉 0 such that the model admits positive traveling wave solutions connecting the disease-free and endemic equilibrium for c 〉 c＊, and when R0 〉 1 and c 〈 c＊, the model has no positive traveling wave solutions connecting them.

关键词： Echinococcosis transmission model locally asymptotically stable globallyasymptotically stable traveling wave solutions diffusive.

Theoretical and Numerical Approximation Methods for Predicting Bending Characteristics of Bimodulus Sandwich Structures

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Acta Mechanica Solida Sinica 2023年第3期36卷 443-456页

作者： Zhenzhou Ye Xiaobin Li zhiting xu Jiangtao Li Wei Shen Wei Chen Key Laboratory of High Performance Ship Technology(Wuhan University of Technology) Ministry of EducationWuhan 430063China School of Naval Architecture Ocean Energy Power EngineeringWuhan University of TechnologyWuhan 430063China Marine Design&Research Institute of China Shanghai 200011China

Sandwich materials are widely used in marine structures because of their excellent comprehensive ***,the solution of bimodulus is ***,the theoretical and numerical approximation methods for the analysis of load-bearing characteristics of bimodulus sandwich structures are put forward comprehensively in this *** on the superposition principle,a theoretical method for calculating the neutral surface position of bimodulus sandwich plate is derived,and the corresponding bending control equation is *** proposed theoretical approximation method can fully consider the sawtooth deformation between the plate and the core,as well as the sawtooth deformation inside the core at the tension–compression ***,a finite element model is established for complex sandwich structures to analyze the influence of *** examples show that the theoretical approximation model proposed in this paper has higher calculation accuracy.

关键词： Sandwich composite Bimodulus Superposition characteristics Layerwise deformation theory

ON THE OSCILLATION OF CERTAIN SECOND ORDER QUASILINEAR NEUTRAL DIFFERENTIAL EQUATIONS

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Annals of Differential Equations 2015年第1期31卷 42-52页

作者： Xianyong Huang zhiting xu Dept. of Math. Guangdong University of Education School of Mathematical Sciences South China Normal University

Some new oscillation theorems for a second order superlinear-sublinear neutral differential equation are established under some conditions. Our results improve and extend the main results in the previous literature. E... 详细信息

关键词： oscillation second-order quasilinear neutral differential equations

OSCILLATION OF THIRD ORDER DELAY DIFFERENTIAL EQUATIONS WITH IMPULSES

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Annals of Differential Equations 2007年第4期23卷 450-460页

作者： Liu Xiuxiang xu zhiting School of Mathematical Sciences South China Normal University Guangzhou 510631

In this paper we study the oscillation and asymptotic behavior of third order delay differential equations with impulses. Some new sufficient conditions which guarantee that every solution is oscillatory or converges ... 详细信息

关键词： oscillation impulses third order delay differential equations

Insights into the architecture of human-induced polygenic selection in Duroc pigs

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Journal of Animal Science and Biotechnology 2023年第1期14卷 60-71页

作者： Zitao Chen Jinyan Teng Shuqi Diao zhiting xu Shaopan Ye Dingjie Qiu Zhe Zhang Yuchun Pan Jiaqi Li Qin Zhang Zhe Zhang National Engineering Research Center for Breeding Swine Industry Guangdong Provincial Key Lab of Agro‑Animal Genomics and Molecular BreedingCollege of Animal ScienceSouth China Agricultural UniversityGuangzhou 510642P.R.China. Department of Animal Science College of Animal ScienceZhejiang University866#Yuhangtang RoadHangzhou 310058P.R.China. Guangdong Provincial Key Laboratory of Marine Biotechnology Shantou University243 Daxue RoadShantou 515063P.R.China Fujian Yongcheng Agricultural&Animal Husbandry Sci-Tech Group Co. Ltd.Fuqing 350399P.R.China. Department of Animal Genetics and Breeding College of Animal Science and TechnologyShandong Agricultural UniversityTai’an 271018P.R.China.

Background:As one of the most utilized commercial composite boar lines,Duroc pigs have been introduced to China and undergone strongly human-induced selection over the past ***,the efficiencies and limitations of previous breeding of Chinese Duroc pigs are largely *** objective of this study was to uncover directional polygenic selection in the Duroc pig genome,and investigate points overlooked in the past breeding ***:Here,we utilized the Generation Proxy Selection Mapping(GPSM)on a dataset of 1067 Duroc pigs with 8,766,074 imputed *** detected a total of 5649 putative SNPs actively under selection in the Chinese Duroc pig population,and the potential functions of the selection regions were mainly related to production,meat and carcass ***,we observed that the allele frequency of variants related to teat number(NT)relevant traits was also changed,which might be influenced by genes that had pleiotropic ***,we identified the direction of selection on NT traits by G,and further pinpointed large-effect genomic regions associated with NT relevant traits by selection signature and *** results of NT relevant traits-specific selection signatures and GWAS,we found three common genome regions,which were overlapped with QTLs related to production,meat and carcass traits besides“teat number”*** implied that there were some pleiotropic variants underlying NT and economic *** further found that rs346331089 has pleiotropic effects on NT and economic traits,e.g.,litter size at weaning(LSW),litter weight at weaning(LWW),days to 100 kg(D100),backfat thickness at 100 kg(B100),and loin muscle area at 100 kg(L100)***:The selected loci that we identified across methods displayed the past breeding process of Chinese Duroc pigs,and our findings could be used to inform future breeding decision.

关键词： Artificial selection GWAS Pig Reproductive organ Selection signatures

A NOTE ON HAUSDORFF MEASURES OF SIERPINSKI CARPETS

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Analysis in Theory and Applications 2001年第3期17卷 85-89页

作者： Ma Dongkui xu zhiting Department of Applied Mathematics South China University of TechnologyGuangzhou510640P R China Department of Applied Mathematics Guangdong University of TechnologyGuangzhou510090P R China

In this paper, regular Sierpinski carpet as a new concept is given. The exact value of Hausdorff measure of the regular Sierpinski carpet and the range of Hausdorff measures for all forms of generalized Sierpinski carpets is also obtained. For any one of the generalized Sierpinski carpets we show that there exists a regular carpet such that they have the same Hausdorff measures.

关键词： Hausdorff measures Sierpinski carpet Hausdorff Measure South China Measures of range of

Integrating genome-wide association study with multi-tissue transcriptome analysis provides insights into the genetic architecture of teat traits in pigs

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Journal of Genetics and Genomics 2023年第10期50卷 795-798页

作者： Chen Wei Xiaodian Cai Shuqi Diao Jinyan Teng zhiting xu Wenjing Zhang Haonan Zeng Zhanming Zhong Xibo Wu Yahui Gao Jiaqi Li Zhe Zhang State Key Laboratory of Swine and Poultry Breeding Industry Guangdong Provincial Key Lab of Agro-Animal Genomics and Molecular BreedingCollege of Animal ScienceSouth China Agricultural UniversityGuangzhouGuangdong 510642China Guangxi State Farms Yongxin Animal Husbandry Group Co.Ltd. NanningGuangxi 530022China

Porcine teat numbers are crucial indicators of the reproductive performance of sows in the pig *** lactation periods,sows with fewer teats may lead to inadequate colostrum intake in piglets,which affects piglet weight gain and mortality(Tummaruk,2013).In pig breeding,high-intensity artificial selection on litter traits potentially gives rise to the functional weakening of teat traits due to the pleiotropic effects of genes affecting both traits(Chen et al.,2022).

关键词： breeding traits artificial

OSCILLATING CRITERIA FOR CERTAIN EVEN ORDER NEUTRAL DIFFERENTIAL EQUATIONS WITH DEVIATING ARGUMENTS

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Annals of Differential Equations 2007年第1期23卷 26-34页

作者： Huang Xianyong xu zhiting Dept. of Math. Guangdong Institute of Education Guangzhou 510303 School of Mathematical Sciences South China Normal University Guangzhou 510631

By using the integral averaging technique, oscillating criteria for certain even order neutral differential equation with deviating arguments are established. These results extend some known oscillation criteria due t... 详细信息

关键词： oscillatory even order neutral differential equation integral averaging technique

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小水线面双体船疲劳分析S-N曲线法研究

中国造船 2017年第2期58卷 38-45页

作者：徐志亭王晓宇中国船舶及海洋工程设计研究院上海200011

针对小水线面双体船,采用船级社提出的简化计算法、谱分析法和设计波法三种常用S-N曲线法进行典型节点的疲劳寿命计算。对各种方法的计算过程及结果进行比较,归纳它们之间的差异和计算过程中的关键点,还就小水线面双体船疲劳评估方法提... 详细信息

针对小水线面双体船,采用船级社提出的简化计算法、谱分析法和设计波法三种常用S-N曲线法进行典型节点的疲劳寿命计算。对各种方法的计算过程及结果进行比较,归纳它们之间的差异和计算过程中的关键点,还就小水线面双体船疲劳评估方法提出建议。

关键词：小水线面双体船 S-N曲线疲劳