检索结果-南通市图书馆

Windowing Waveform Relaxation of Initial Value Problems

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2006年第4期22卷 575-588页

作者： yao-lin jiang Department of Mathematical Sciences Xi'an Jiaotong University Xi'an 710049 China

We present a windowing technique of waveform relaxation for dynamic systems. An effective estimation on window length is derived by an iterative error expression provided here. Relaxation processes can be speeded up if one takes the windowing technique in advance. Numerical experiments are given to further illustrate the theoretical analysis.

关键词： Initial value problems waveform relaxation semigroup solutions windowing technique parallel processing

ON CONTRACTION AND SEMI-CONTRACTION FACTORS OF GSOR METHOD FOR AUGMENTED linEAR SYSTEMS

在线全文

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2010年第6期28卷 901-912页

作者： Fang Chen yao-lin jiang Bing Zheng Department of Mathematical Sciences Xi'an Jiaotong University Xi'an 710049 China School of Science Xi'an University of Post and Telecommunications Xi'an 710121 China Department of Mathematical Sciences Xi ' an Jiaotong University Xi ' an 710049 China School of Mathematics and Statistics Lanzhou University Lanzhou 730000 China

The generalized successive overrelaxation （GSOR） method was presented and studied by Bai, Parlett and Wang [Numer. Math. 102（2005）, pp.1-38] for solving the augmented system of linear equations, and the optimal iteration parameters and the corresponding optimal convergence factor were exactly obtained. In this paper, we further estimate the contraction and the semi-contraction factors of the GSOR method. The motivation of the study is that the convergence speed of an iteration method is actually decided by the contraction factor but not by the spectral radius in finite-step iteration computations. For the nonsingular augmented linear system, under some restrictions we obtain the contraction domain of the parameters involved, which guarantees that the contraction factor of the GSOR method is less than one. For the singular but consistent augmented linear system, we also obtain the semi-contraction domain of the parameters in a similar fashion. Finally, we use two numerical examples to verify the theoretical results and the effectiveness of the GSOR method.

关键词： Contraction and semi-contraction factors, Augmented linear system, GSOR method Convergence.

On the Weak Solutions to Steady-State Mixed Navier–Stokes/Darcy Model

在线全文

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Series 2023年第5期39卷 939-951页

作者： Yan Ren HOU Dan Dan XUE yao lin jiang School of Mathematics and Statistics Xi'an Jiaotong UniversityXi'an 710049P.R.China College of Mathematics and System Science Xinjiang UniversityWulumuqi 830046P.R.China College of Mathematics and Physics Chengdu University of TechnologyChengdu 610059P.R.China

In this paper,for the mixed Navier–Stokes/Darcy model with Beavers–Joseph–Saffman’s interface condition,we first establish an a priori estimate for possible weak solutions by means of expanding the coupled *** we prove the existence of weak solutions without the small data and/or large viscosity restriction,which is required for the existence of the weak solutions in *** a direct corollary,we also get the global uniqueness of the weak solution.

关键词： Porous media fow Navier-Stokes equations weak solution a priori estimate existence and global uniqueness

A delayed predator-prey system with impulsive diffusion between two patches

在线全文

学校读者我要写书评

暂无评论

International Journal of Biomathematics 2017年第1期10卷 175-194页

作者： Hong-Li Li Long Zhang Zhi-Dong Teng yao-lin jiang College of Mathematics and System SciencesXinjiang University Urumqi 830046 P. R. China

In most models of population dynamics, diffusion between two patches is assumed to be either continuous or discrete. However, in the real world, it is often the case that diffusion occurs at certain moment every year, impulsive diffusion can provide a more suitable manner to model the actual dispersal （or migration） behaviors for many eco- logical species. In addition, it is generally recognized that some kinds of time delays are inevitable in population interactions. In view of these facts, a delayed predator-prey system with impulsive diffusion between two patches is proposed. By using compari- son theorem of impulsive differential equation and some analysis techniques, criteria on the global attractivity of predator-extinction periodic solution are established, sufficient conditions for the permanence of system are obtained. Finally, numerical simulations are presented to illustrate our theoretical results.

关键词： Predator-prey delay impulsive diffusion global attractivity permanence.

PARALLEL DYNAMIC ITERATION METHODS FOR SOLVING NONlinEAR TIME-PERIODIC DIFFERENTIAL-ALGEBRAIC EQUATIONS

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2003年第3期21卷 367-374页

作者： yao-lin jiang(Institute of Information fe System Sciences, School of Science, Xi’an Jiaotong University,Xi’an 710049, China) Institute of Information & System Sciences School of Science Xi'an Jiaotong University Xi'an 710049

In this paper we presented a convergence condition of parallel dynamic iteration methods for a nonlinear system of differential-algebraic equations with a periodic constraint. The convergence criterion is decided by the spectral expression of a linear operator derived from system partitions. Numerical experiments given here confirm the theoretical work of the paper.

关键词： Nonlinear dynamic equations Periodic solutions Dynamic iterations Engi- neering applications.

Rhyscotus subrisus Li&jiang,***.,representing a new record family Rhyscotidae from China(Isopoda:Oniscidea)

在线全文

学校读者我要写书评

暂无评论

Zoological Systematics 2024年第2期49卷 181-183页

作者： Chonghui yao Chao jiang Weichun Li College of Agronomy Jiangxi Agricultural UniversityNanchang 330045China State Key Laboratory for Quality Ensurance and Sustainable Use of Dao-di Herbs National Resource Center for Chinese MateriaMedicaChina Academy of Chinese Medical SciencesBeijing 100700China

The family Rhyscotidae Budde-Lund,1904 contains two genera:Rhyscotoides Schmalfuss&Ferrara,1978 and Rhyscotus Budde-Lund,*** date,twenty-one species within the family are known,occurring in the subtropic and tropic regions(Schmalfuss,2003;Schmidt,2003;Boyko et al.,2022).The members of the family can be recognized by the cephalon with a strongly inflated frons,the antennae with two-jointed flagellum,the maxillae are almost semicircular,the maxillipeds have short palpus and endite,and pleopod exopodites without pseudotracheae(Schmalfuss&Ferrara,1978).Before this study,the members of Rhyscotidae were unknown in *** present research describes a new species of the genus Rhyscotus from Hainan Island,representing a new record of the family Rhyscotidae from China.

关键词： record family

A lubrication model for bubbly oil lubrication with interfacial effect and thermal effect using the theory of multiphase mixtures

在线全文

学校读者我要写书评

暂无评论

Friction 2024年第2期12卷 271-290页

作者： Shaohua LI Xiaohui lin Shuyun jiang School of Mechanical Engineering Southeast UniversityNanjing 211189China

Bubbly oil lubrication is a type of lubrication ***,the lubrication model of the bubbly oil has not been thoroughly *** paper aims to investigate the modelling for bubbly oil lubrication considering the interfacial effect and thermal effect,and a theoretical model is established based on the theory of multiphase *** interfacial and thermal effects on the static characteristics of a thrust bearing are analyzed.A test rig for the thrust bearing is developed to measure the static characteristics of the bearing under bubbly oil *** results show that the bearing static characteristics,*** temperature rise,film thickness,friction torque,and volume flow,increase with consideration of three interfacial effects;the bearing temperature rise increases but the film thickness,friction torque,and volume flow rate decrease with consideration of the three thermal effects;the thermal effect on the bearing static characteristics is greater than the interfacial effect.

关键词： bubbly oil lubrication theory of multiphase mixtures interfacial effect thermal effect fluid bearing

Traditional Chinese medicine for the treatment of immune-related nephropathy:A review

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Pharmaceutica Sinica B 2024年第1期14卷 38-66页

作者： Pu jiang Changliang yao De-an Guo School of Pharmacy Nanjing University of Chinese MedicineNanjing 210023China Shanghai Research Center for Modernization of Traditional Chinese Medicine National Engineering Research Center of TCM Standardization TechnologyShanghai Institute of Materia MedicaChinese Academy of SciencesShanghai 201203China

Immune-related nephropathy(IRN)refers to immune-response-mediated glomerulonephritis and is the main cause of end-stage renal *** pathogenesis of IRN is not fully understood;therefore,treatment is *** Chinese medicines(TCMs)have potent clinical effects in the treatment of the IRN conditions immunoglobulin A nephropathy,lupus nephropathy,and diabetic *** underlying mechanisms mainly include its inhibition of inflammation;improvements to renal interstitial fibrosis,oxidative stress,autophagy,apoptosis;and regulation of *** this review,we summarize the clinical symptoms of the three IRN subtypes and the use of TCM prescriptions,herbs,and bioactive compounds in treating IRN,as well as the potential mechanisms,intending to provide a reference for the future study of TCM as IRN treatments.

关键词： IgA nephropathy Diabetic nephropathy Lupus nephritis Traditional Chinese medicine Immunity Pathogenesis Mechanism Pathophysiology

The role of vitamin E in polyunsaturated fatty acid synthesis and alleviating endoplasmic reticulum stress in sub-adult grass carp(Ctenopharyngodon idella)

在线全文

学校读者我要写书评

暂无评论

Animal Nutrition 2024年第1期16卷 275-287页

作者： Ke yao lin Feng Wei-Dan jiang Yang Liu Lu Zhang Hai-Feng Mi Xiao-Qiu Zhou Pei Wu Animal Nutrition Institute Sichuan Agricultural University Fish Nutrition and Safety Production University Key Laboratory of Sichuan Province Sichuan Agricultural University Key Laboratory of Animal Disease-Resistance Nutrition Ministry of Education Ministry of Agriculture and Rural Affairs Key Laboratory of Sichuan Province Tongwei Co. Ltd. Healthy Aquaculture Key Laboratory of Sichuan Province

Vitamin E(VE) is an essential lipid-soluble vitamin that improves the fish flesh quality. However, the underlying molecular mechanisms remain unclear. This study aimed to investigate the effects of VE on growth performance and flesh quality in sub-adult grass carp(Ctenopharyngodon idella). A total of 450fish(713.53 ± 1.50 g) were randomly divided into six treatment groups(three replicates per treatment)and fed for nine weeks with different experimental diets(dietary lipid 47.8 g/kg) that contained different levels of VE(5.44, 52.07, 96.85, 141.71, 185.66, and 230.12 mg/kg diet, supplemented as dl-a-tocopherol acetate). Notably, the treatment groups that were fed with dietary VE ranging from 52.07 to230.12 mg/kg diet showed improvement in the percent weight gain, special growth rate, and feed efficiency of grass carp. Moreover, the treatment groups supplemented with dietary VE level of 141.71,185.66, and 230.12 mg/kg diet showed enhancement in crude protein, lipid, and a-tocopherol contents in the muscle, and the dietary levels of VE ranging from 52.07 to 141.71 mg/kg diet improved muscle pH24h and shear force but reduced muscle cooking loss in grass carp. Furthermore, appropriate levels of VE(52.07 to 96.85 mg/kg diet) increased the muscle polyunsaturated fatty acid content in grass carp. Dietary VE also increased the mRNA levels of fatty acid synthesis-related genes, including fas, scd-1, fad,elovl, srebp1, pparγ, and lxra, and up-regulated the expression of SREBP-1 protein. However, dietary VE decreased the expression of fatty acid decomposition-related genes, including hsl, cpt1, acox1, and ppara,and endoplasmic reticulum stress-related genes, including perk, ire1, atf6, eif2a, atf4, xbp1, chop, and grp78, and down-regulated the expression of p-PERK, p-IRE1, ATF6, and GRP78 proteins. In conclusion,dietary VE increased muscle fatty acid synthesis, which may be partly associated with the alleviation of endoplasmic reticulum stress, and ultimately improves fish fles

关键词： Vitamin E Flesh quality Muscle polyunsaturated fatty acid level Endoplasmic reticulum stress Growth performance Grass carp