检索结果-南通市图书馆

Two-Level Additive Schwarz Methods Using Rough Polyharmonic Splines-Based Coarse Spaces

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2015年第5期36卷 803-812页

作者： rui du Lei ZHANG Mathematical Center for Interdisciplinary Research School of Mathematical Sciences Soochow University Institute of Natural Sciences and Department of Mathematics Ministry of Education Key Laboratory of Scientific and Engineering Computing Shanghai Jiaotong University

This paper introduces a domain decomposition preconditioner for elliptic equations with rough coefficients. The coarse space of the domain decomposition method is constructed via the so-called rough polyharmonic splines （RPS for short）. As an approximation space of the eUiptic problem, RPS is known to recover the quasi-optimal convergence rate and attain the quasi-optimal localization property. The authors lay out the formulation of the RPS based domain decomposition preconditioner, and numerically verify the performance boost of this method through several examples.

关键词： Numerical homogenization Domain decomposition Two-level Schwarz additive preconditioner Rough polyharmonic splines

Quantum spin Hall effect in inverted InAs/GaSb quantum wells

在线全文

学校读者我要写书评

暂无评论

Frontiers of physics 2012年第2期7卷 200-207页

作者： Ivan Knez (1) rui-rui du (1) 1. Department of Physics and Astronomy Rice University Houston TX 77251-1892 USA

We review the recent experimental progress towards observing quantum spin Hall effect in inverted InAs/GaSb quantum wells （QWs）. Low temperature transport measurements in the hybridization gap show bulk conductivity of a non-trivial origin, while the length and width dependence of con- ductance in this regime show strong evidence for the existence of helical edge modes proposed by Liu et al. [Phys. Rev. Lett., 2008, 100： 236601]. Surprisingly, edge modes persist in spite of compa- rable bulk conduction and show only weak dependence on magnetic field. We elucidate that seeming independence of edge on bulk transport comes due to the disparity in Fermi-wave vectors between the bulk and the edge, leading to a total internal reflection of the edge modes.

关键词： quantum spin Hall effect InAs/GaSb quantum wells topological insulators

BDNF improves axon transportation and rescues visual function in a rodent model of acute elevation of intraocular pressure

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

Science China(Life Sciences) 2020年第9期63卷 1337-1346页

作者： rui du Xu Wang Shigang He School of Biomedical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Institute of Natural Sciences Shanghai Jiao Tong UniversityShanghai 200240China Bio-X Institute Shanghai Jiao Tong UniversityShanghai 200240China

Optic neuropathies lead to blindness;the common pathology is the degeneration of axons of the retinal ganglion cells. In this study, we used a rat model of retinal ischemia-reperfusion and a one-time intravitreal brain-derived neurotrophic factor(BDNF)injection;then we examined axon transportation function, continuity, physical presence of axons in different part of the optic nerve, and the expression level of proteins involved in axon transportation. We found that in the disease model, axon transportation was the most severely affected, followed by axon continuity, then the number of axons in the distal and proximal optic nerve. BDNF treatment relieved all reductions and significantly restored function. The molecular changes were more minor,probably due to massive gliosis of the optic nerve, so interpretation of protein expression data should be done with some *** process in this acute model resembles a fast-forward of changes in the chronic model of glaucoma. Therefore, impairment in axon transportation appears to be a common early process underlying different optic neuropathies. This research on effective intervention can be used to develop interventions for all optic neuropathies targeting axon transportation.

关键词： acute elevation of IOP axon transportation axon continuity visual acuity contrast sensitivity rat

Temporal Second-order Scheme for a Hidden-memory Variable Order Time Fractional Diffusion Equation with an Initial Singularity

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2024年第4期40卷 1060-1077页

作者： rui-lian du Zhi-zhong SUN School of Big Data Changzhou UniversityChangzhou 213164China Department of Mathematics Shanghai UniversityShanghai 200444China School of Mathematics Southeast UniversityNanjing 210096China

In this work,a novel time-stepping L1 formula is developed for a hidden-memory variable-order Caputo’s fractional derivative with an initial *** formula can obtain second-order accuracy and an error estimate is analyzed *** an application,a fully discrete difference scheme is established for the initial-boundary value problem of a hidden-memory variable-order time fractional diffusion *** experiments are provided to support our theoretical results.

关键词： time fractional diffusion equation hidden-memory variable-order fractional derivative error estimate initial singularity

Prognostic impact of number of examined lymph nodes on survival of patients with appendiceal neuroendocrine tumors

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第30期10卷 10906-10920页

作者： rui du Jiang-Wei Xiao Department of Gastrointestinal Surgery The First Affiliated Hospital of Chengdu Medical CollegeChengdu 610500Sichuan ProvinceChina

BACKGROUND The prognosis of patients with appendiceal neuroendocrine tumors(ANETs) is related to lymph node(LN) metastasis and other ***,it is unclear how the number of examined LNs(ELNs) impact on *** To determine the factors affecting the cancer-specific survival(CSS) of patients with ANET and to evaluate the impact of the number of ELNs on *** A total of 4583 ANET patients were analyzed in the Surveillance,Epidemiology,and End Results *** survival analysis was used to identify factors related to survival and the optimal number of ELNs and lymph node ratio(LNR) were determined by the Kaplan–Meier *** survival difference was determined by *** Except for sex,the other factors,such as age,year,race,grade,histological type,stage,tumor size,ELNs,LNR,and surgery type,were associated with *** 3-,5-,and 10-year CSS rates of ANET patients were 91.2%,87.5,and 81.7%,respectively(median follow-up period of 31 mo and range of 0-499 mo).There was no survival difference between the two surgery types,namely,local resection and colectomy or greater,in both stratifications of tumor size ≥ 2 cm(P = 0.523)and < 2 cm(P = 0.068).In contrast to patients with a tumor size < 2 cm,those with a tumor size ≥ 2 cm were more likely to have LN metastasis(χ~2 = 378.16,P < 0.001).The optimal number of ELNs was more than 11,7,and 18 for all patients,nodenegative patients,and node-positive patients,*** rates of patients with a larger number of ELNs were significantly improved(≤ 10 vs ≥ 11,χ~2 =20.303,P < 0.001;≤ 6 vs ≥ 7,χ~2 = 11.569,P < 0.001;≤ 17 vs ≥ 18,χ~2 = 21.990,P < 0.001;respectively).ANET patients with an LNR value ≤ 0.16 were more likely to have better survival than those with values of 0.17-0.48(χ~2 = 48.243,P < 0.001) and 0.49-1(χ~2 = 168.485,P < 0.001).CONCLUSION ANET ≥ 2 cm are more likely to develop LN *** least 11 ELNs are required to better evaluate the *** patients with posi

关键词： Appendiceal neoplasm Neuroendocrine tumors Carcinoid tumor Lymph node dissection Lymph node ratio Survival analysis

Decreasing intraocular pressure significantly improves retinal vessel density,cytoarchitecture and visual function in rodent oxygen induced retinopathy

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

Science China(Life Sciences) 2020年第2期63卷 290-300页

作者： rui du Xu Wang Ke Shen Shigang He School of Biomedical Engineering Shanghai Jiao Tong UniversityShanghai 200240China Institute of Natural Sciences Shanghai Jiao Tong UniversityShanghai 200240China Bio-X Institute Shanghai Jiao Tong UniversityShanghai 200240China

We attempted to explore a noninvasive,easily applicable and economically affordable therapy for retinopathy of prematurity(ROP).Rat pups were raised in 80%oxygen from postnatal day 7 to P12,and returned to room *** eye drops were administered twice a day for 7 days,to reduce intraocular pressure(IOP)by about 20%.Immunohistochemical staining was performed to visualize vessel endothelial cells,to analyze retinal neurons and *** experiments were carried out to test visual acuity and contrast *** the end of the 7-day treatment,the number of vessels extending to the vitreous body was significantly reduced and retinal vessel density *** improvement was maintained to the end of the12 th *** the central retina of the model group,the horizontal cells were completely wiped out,the outer plexiform layer was undetectable,and the rod bipolar cell dendrites sprouted into the outer nuclear *** treatment partially reverted these architectural *** importantly,behavioral experiments revealed significantly improved visual acuity and contrast sensitivity in the treated ***,reducing IOP could potentially serve as a safe and economical measure to treat ROP.

关键词： oxygen induced retinopathy vessel plasticity visual acuity contrast sensitivity rat

Lattice Boltzmann Model for Time-Fractional NonlinearWave Equations

在线全文

学校读者我要写书评

暂无评论

Advances in Applied Mathematics and Mechanics 2022年第4期14卷 914-935页

作者： Yibo Wang rui du Zhenhua Chai School of Mathematics Southeast UniversityNanjingJiangsu 210089China School of Mathematics and Statistics Huazhong University of Science and TechnologyWuhanHubei 430074China

In this paper,a lattice Boltzmann model with BGK operator(LBGK)for solving time-fractional nonlinear wave equations in Caputo sense is ***,the Caputo fractional derivative is approximated using the fast evolution algorithm based on the sum-of-exponentials *** the target equation is transformed into an approximate form,and for which a LBGK model is *** the Chapman-Enskog analysis,the macroscopic equation can be recovered from the present LBGK *** addition,the proposed model can be extended to solve the time-fractional Klein-Gordon equation and the time-fractional Sine-Gordon ***,several numerical examples are performed to show the accuracy and efficiency of the present LBGK *** the numerical results,the present model has a second-order accuracy in space.

关键词： Lattice Boltzmann method time-fractional wave equation time-fractional Klein-Gordon equation time-fractional Sine-Gordon equation

The test freezing temperature of C_2―C_6 dicarboxylic acid: The important indicator for ice nucleation processes

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

Chinese Science Bulletin 2008年第17期53卷 2685-2691页

作者： du rui P. A. ARIYA Graduate University of Chinese Academy of Sciences Beijing 100049 China Institute of Atmosphere Physics Chinese Academy of Sciences Beijing 100029 China Department of Chemistry and Department of Atmospheric and Oceanic Sciences McGill University 801 Sherbrooke St. W Montreal. PQ. Canada. H3A 2K6

The importance of organic compounds as significant constituents of atmospheric aerosols, and cloud condensation nuclei (CCN), as well as players influencing the tropospheric oxidation and atmospheric energy budget, have been increasingly recognized. Low molecular weight dicarboxylic acids (LMW-DCAs) are significant identified portions of atmospheric condensed matter including aerosols, fog and clouds. Besides the photochemical transformation of DCA, the implication of organic matter in ice nucleation processes has been considered. In this study, we investigated the freezing temperature of pure and mixed (C2―C6) DCA solutions in ultra-pure water and tap water solution droplets using a freezing nucleus counter at different pH, and in different water ionic conditions. The mean freezing temperature of different mixture of LMW-DCA in ultra-pure and tap water solution droplets ranged from ?24.1±2.8 to ?21.3±3.9℃ and ?10.2±2.2 to ?9.5±2.2℃, respectively. The mean freezing temperature of the control (ultra-pure and tap) water droplets (?22.6±3.5℃, 11.2±2.4℃) was also measured. The results, and their implications in atmospheric chemistry and physics of the atmosphere will be discussed.

关键词：二羧酸凝固温度冰核形成指示剂

INCOMPRESSIBLE MULTI-RELAXATION-TIME LATTICE BOLTZMANN MODEL IN 3-D SPACE

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2010年第6期22卷 782-787页

作者： du rui SHI Bao-chang Department of Mathematics South East University Nanjing 210096 China Department of Mathematics Huazhong University of Science and Technology Wuhan 430074 China

Multi-Relaxation-Time Lattice Boltzmann Method （MRT LBM） is of better numerical stability and has attracted more and more research interests. The previous MRT LBM included artificial compressible effects. To overcome the disadvantage, an incompressible MRT LBM has been proposed in two dimensions recently. In this article, we present incompressible MRT LBMs in 3-D space, with example of nineteen-velocity. The equilibria in momentum space are derived from an earlier incompressible Lattice Bhatnagar-Gross-Krook （LBGK） model proposed by Guo et al.. Through the Chapman-Enskog （C-E） expansion, the incompressible Navier-Stokes （N-S） equations can be recovered without artificial compressible effects. Simulations of a lid-driven cavity flow in three dimensions with Re = 1 000, 2 000 and 3 200 are performed. The simulation results agree with the existing data and clearly demonstrate better numerical stability of the presented model over the incompressible LBGK model.

关键词： incompressible flow Multi-Relaxation-Time (MRT) Lattice Boltzmann Method (LBM)