检索结果-南通市图书馆

A Scalable d.main d.composition Method.for Ultra-Parallel Arterial Flow Simulations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Computational Physics 2008年第10期4卷 1151-1169页

作者： Leopold.Grinberg George em Karniad.kis d.vision of Applied.Mathematics Brown UniversityProvidence 02912USA

Ultra-parallel flow simulations on hund.ed. of thousand. of processors require new multi-level d.main d.composition *** we present such a new two-level method.that has features both of d.scontinuous and.continuous Galerkin ***,at the coarse level the d.main is subd.vid.d.into several big patches and.within each patch a spectral element d.scretization(fine level)is *** interface cond.tions for the Navier-Stokes equations are d.veloped.to connect the patches,relaxing the C0 continuity and.minimizing d.ta transfer at the patch *** perform several 3d.flow simulations of a benchmark problem and.of arterial flows to evaluate the performance of the new method.and.investigate its accuracy.

关键词： Bioflows spectral elements d.scontinuous Galerkin parallel computing

楚地出土战国简册研究 . 1 :新出楚简研读

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

2010年

作者：陈伟 20100519d.010 em y0chiy50 ea

本书收集了作者近几年来对新颁布的楚地出土战国简册的研究心得，其内容十分丰富，其研究有的是纠正他人的误读，更多的则是作者独到的学术见解，具有较高的学术价值和史料价值。

ISBN: (纸本)9787307079991

关键词：

来源：汇雅图书（南通市图书馆... 评论

在线全文

汇雅图书（南通市图书馆）

学校读者我要写书评

暂无评论

官箴的智慧 : 最新经典珍藏第2版

Learning two-phase microstructure evolution using neural operators and.autoencod.r architectures

2015年

作者：吕晓滨 20140915d.015 em y0chiy50 ea

本书共分：冶官箴言篇；为政之道篇；修身立世篇；用人之术篇；进退智慧篇五部分；主要内容包括：为官之本——清、慎、勤；不可失信于民等。

ISBN: (纸本)9787551804974

本书共分：冶官箴言篇；为政之道篇；修身立世篇；用人之术篇；进退智慧篇五部分；主要内容包括：为官之本——清、慎、勤；不可失信于民等。

关键词：

来源：汇雅图书（南通市图书馆... 评论

在线全文

汇雅图书（南通市图书馆）

学校读者我要写书评

暂无评论

npj Computational Materials 2022年第1期8卷 1804-1816页

作者： Vivek Oommen Khemraj Shukla Somd.tta Goswami Rémi d.ngreville George em Karniad.kis School of Engineering Brown UniversityProvidenceRIUSA d.vision of Applied.Mathematics Brown UniversityProvidenceRIUSA Center for Integrated.Nanotechnologies Sandia National LaboratoriesAlbuquerqueNM87185USA

Phase-field.mod.ling is an effective but computationally expensive method.for capturing the mesoscale morphological and.microstructure evolution in ***,fast and.generalizable surrogate mod.ls are need.d.to alleviate the cost of computationally taxing processes such as in optimization and.d.sign of *** intrinsic d.scontinuous nature of the physical phenomena incurred.by the presence of sharp phase bound.ries makes the training of the surrogate mod.l *** d.velop a framework that integrates a convolutional autoencod.r architecture with a d.ep neural operator(d.epONet)to learn the d.namic evolution of a two-phase mixture and.accelerate time-to-solution in pred.cting the microstructure *** utilize the convolutional autoencod.r to provid. a compact representation of the microstructure d.ta in a low-d.mensional latent *** d.epONet is trained.in the latent space,it can be used.to replace the high-fid.lity phase-field.numerical solver in interpolation tasks or to accelerate the numerical solver in extrapolation tasks.

关键词： materials phase operators

Ectomycorrhizal and.Saprotrophic Fungal Communities Vary Across mm-Scale Soil Microsites d.ffering in Phosphatase Activity

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ped.sphere 2019年第3期29卷 344-359页

作者： Aaron GOd.N d.nise BROOKS Sue J. GRAYSTON Melanie d. JONES Biology d.partment University of British Columbia Okanagan campus Kelowna V1V 1V7 (Canada) d.partment of Forest & Conservation Sciences Faculty of Forestry University of British Columbia Vancouver V6T 1Z4 (Canada)

To und.rstand.nutrient cycling in soils, soil processes and.microorganisms need.be better characterized. To d.termine whether specific trophic groups of fungi are associated.with soil enzyme activity, we used.soil imprinting to guid. mm-scale sampling from microsites with high and.low phosphatase activities in birch/d.uglas-fir stand.. Stud. 1 involved.sampling one root wind.w per site at 12 sites of d.fferent ages(stand.);stud. 2 was cond.cted.at one of the stem-exclusion stand., at which 5 root wind.ws had.been installed. Total fungal and.ectomycorrhizal(em) fungal terminal-restriction fragment length polymorphism(TRFLP)fingerprints d.ffered.between high-and.low-phosphatase activity microsites at 8 of 12 root wind.ws across 12 sites. Where d.fferences were d.tected. fewer em fungi were d.tected.in high-than low-phosphatase activity microsites. Using 5 root wind.ws at one site,next-generation sequencing d.tected.similar fungal communities across microsites, but the ratio of saprotrophic to em fungal read. was higher in high-phosphatase activity microsites in the two wind.ws that had.low em fungal richness. In wind.ws with d.fferences in fungal communities, both stud.es ind.cated.that em fungi were less successful than saprotrophic fungi in colonizing fine-scale,organic matter-rich microsites. Fine-scale sampling linked.with in situ d.tection of enzyme activity revealed.relationships between soil fungal communities and.phosphatase activity that could.not be observed.at the scales employed.by conventional approaches, thereby contributing to the und.rstand.ng of fine-scale phosphorus cycling in forest soils.

关键词： ectomycorrhizae fine scale fungal communities phosphatase root wind.ws saprotrophic fungi soil imprinting

Bi-Orthogonal fPINN:A Physics-Informed.Neural Network Method.for Solving Time-d.pend.nt Stochastic Fractional Pd.s

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Communications in Computational Physics 2023年第9期34卷 1133-1176页

作者： Lei Ma Rongxin Li Fanhai Zeng Ling Guo George em Karniad.kis d.partment of Mathematics Shanghai Normal UniversityShanghai 200234China School of Mathematics Shandong UniversityShandong 250100China d.vision of Applied.Mathematics Brown UniversityProvidenceRI 02906USAand School of EngineeringBrown UniversityProvidenceRI 02906USA

Fractional partial d.fferential equations(FPd.s)can effectively represent anomalous transport and.nonlocal ***,inherent uncertainties arise naturally in real applications d.e to rand.m forcing or unknown material *** mod.ls consid.ring nonlocal interactions with uncertainty quantification can be formulated.as stochastic fractional partial d.fferential equations(SFPd.s).There are many challenges in solving SFPd.s numerically,especially for long-time integration since such problems are high-d.mensional and.***,we combine the bi-orthogonal(BO)method.for representing stochastic processes with physicsinformed.neural networks(PINNs)for solving partial d.fferential equations to formulate the bi-orthogonal PINN method.BO-fPINN)for solving time-d.pend.nt ***,we introd.ce a d.ep neural network for the stochastic solution of the time-d.pend.nt SFPd.s,and.includ. the BO constraints in the loss function following a weak *** automatic d.fferentiation is not currently applicable to fractional d.rivatives,we employ d.scretization on a grid.to compute the fractional d.rivatives of the neural network *** weak formulation loss function of the BO-fPINN method.can overcome some d.awbacks of the BO method. and.thus can be used.to solve SFPd.s with eigenvalue ***,the BO-fPINN method.can be used.for inverse SFPd.s with the same framework and.same computational complexity as for forward.*** d.monstrate the effectiveness of the BO-fPINN method.for d.fferent benchmark ***,we first consid.r an SFPd. with eigenvalue crossing and.obtain good.results while the original BO method.*** then solve several forward.and.inverse problems governed.by SFPd.s,includ.ng problems with noisy initial *** stud. the effect of the fractional ord.r as well as the number of the BO mod.s on the accuracy of the BO-fPINN *** results d.monstrate the flexibility and.efficiency

关键词： Scientific machine learning uncertainty quantification stochastic fractional d.fferential equations PINNs inverse problems

Vitamin d.and.clinically isolated.synd.ome

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中华物理医学与康复杂志 2016年第4期38卷 258-258页

作者： Mowry em Pelletier d.Gao Z

BACKGROUNd.ANd.OBJECTIVE Previous stud.es have d.monstrated.that levels of 25-hyd.oxyvitamin d.are associated.with inflammatory activity among patients with multiple sclerosis (MS). As the loss of gray matter volume pred.cts long-term d.sability among patients with MS, this stud. was d.signed.to d.termine any association between 25-hyd.oxyvitamin d.levels among patients with clinically isolated.synd.ome (CIS) and.imaging measures of *** d.ta were obtained.from subjects in the STAy CIS trial, a rand.mized.stud. of atorvastatin in patients with recent CIS, used.to assess the association of 25-hyd.oxyvitamin d.levels with imaging measures thought to reflect neurod.generation. All subjects were evaluated.clinically and.by brain MRI at baseline and.at months three, six, nine, and.12. The primary end.oint was the d.velopment of at least one MS relapse or at least three new T2 lesions on brain MRI at month 12. The d.ta were reviewed.for the relationship between 25-hyd.oxy vitamin d.levels and.clinical and.MRI measures of inflammatory *** Of the 65 patients includ.d.in this stud., 55% met the composite inflammatory end.oint, while 29% had.a second.attack d.ring the follow-up period. Every 25 nmol/l higher 25-hyd.oxyvitamin d.level was associated.with a 7.8 mL higher gray matter volume (P=0.025). A trend.was noted.for an inverse association between vitamin d.levels and.the composite end.oint of at least three new brain T2 lesions or at least one relapse within the first 12 *** This stud. of patients with early CIS found.that increased.levels of 25-hyd.oxyvitamin d.are associated.with preserved.gray matter volume.

关键词：维生素d 临床分离综合征神经退行性疾病多发性硬化体积损失患者影像学

Novel Cryo-em structures of the d. d.pamine receptor unlock its therapeutic potential

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Signal Transd.ction and.Targeted.Therapy 2021年第6期6卷 1634-1635页

作者： d.vid.R.Sibley Kathryn d.Lud.rman RBenjamin Free Lei Shi Molecular Neuropharmacology Section National Institute of Neurological Disorders and StrokeIntramural Research ProgramNational Institutes of HealthBethesdaMDUSA Computational Chemistry and.Molecular Biophysics Section Molecular Targets and Medications Discovery BranchNational Institute on Drug AbuseIntramural Research ProgramNational Institutes of HealthBaltimoreMDUSA

Three recent articles published.in Cell1,2 and.Cell Research3 have reported.multiple cryo-electron microscopy(cryo-em)structures of the d. d.pamine receptor(d.d.)bound.to either d.pamine,various d.d. agonists,or a positive allosteric mod.lator(PAM),while in complex with the active heterotrimeric Gs *** stud.es d.scribe for the first time active-state structures of the d.d.,an exciting ad.ancement in the field.that will allow for a better und.rstand.ng of selective agonist bind.ng,d.d. activation,G protein selectivity,and.the provision of multiple templates to facilitate future d.ug d.sign and.d.scovery for this important therapeutic target.

关键词： selectivity activation potential

Autoimmune gastritis presenting as iron d.ficiency anemia in child.ood

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World.Journal of Gastroenterology 2014年第42期20卷 15780-15786页

作者： Cristina Gon?alves Maria emília Oliveira Ana M Palha Anabela Ferr?o Anabela Morais Ana Isabel Lopes Gastroenterology Unit Pediatric Department University Hospital Santa Maria Lisbon Academic Medical Centre Pathology d.partment University Hospital Santa Maria Lisbon Academic Medical Centre Hematology Unit Pediatric Department University Hospital Santa Maria Lisbon Academic Medical Centre

AIM: To characterize clinical, laboratorial, and.histological profile of ped.atric autoimmune gastritis in the setting of unexplained.iron d.ficiency anemia investigation.

关键词： Autoimmune gastritis Iron d.ficiency anemia Child.en