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The low Mach number limit of non-isentropic magnetohy.rody.amic equations with large temperature variations in bounded domains

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Science China Mathematics 2024年第4期67卷 787-818页

作者： Min Liang y.obin ou School of Mathematics Renmin University of ChinaBeijing 100872China

This paper verifies the low Mach number limit of the non-isentropic compressible magnetohy.rody.amic(MHD)equations with or without the magnetic diffusion in a three-dimensional bounded domain when the temperature variation is large but *** uniform estimates of strong solutions are established in a short time interval independent of the Mach number,provided that the slip boundary.condition for the velocity.and the Neumann boundary.condition for the temperature are imposed and the initial data is well-prepared.

关键词： low Mach number limit non-isentropic compressible magnetohy.rody.amic equations large temperature variations bounded domains

High-throughput screening of single-atom cataly.ts confined in monolay.r black phosphorus for efficient nitrogen reduction reaction

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Nano Research 2024年第4期17卷 2360-2367页

作者： Xiao-y.n Li Many. Duan Pengfei ou Department of Electrical and Computer Engineering University of TorontoTorontoOntario M5S 1A4Canada School of Phy.ics and Electronic Engineering Sichuan Normal UniversityChengdu 610101China Department of Chemistry Northwestern UniversityEvanstonIL 60208USA

The discovery.of metal-nitrogen centers as the active sites for electroly.is has aroused significant interest in utilizing single-atom cataly.ts for nitrogen reduction reaction(NRR).Properly.designed nanostructured cataly.ts that strongly.interact with nitrogen molecules(N_(2))can promote adsorption and activation,thereby.resulting in efficient cataly.ts with high stability.activity.and *** this study.using density.functional theory.calculations,we selected monolay.r black phosphorus(BP)as the substrate and screened a series of single-atom transition metals confined in tri-coordinated and tetra-coordinated active centers(without and with N dopants)to electro-cataly.e *** a result,we have identified two promising candidates(Hf_(1)-N_(1)P_(2)-1 and Tc_(1)-N_(4)),which exhibit not only.low overpotentials of 0.56 and 0.49 V but also high thermody.amic and electrochemical stability.as well as good selectivity.towards NRR over the competing hy.rogen evolution *** also demonstrate the ability.of Hf_(1)-N_(1)P_(2)-1 and Tc_(1)-N_(4) to activate and hy.rogenate N_(2) by.donating electrons and regulating charge *** study.not only.predicts new BP-based promising cataly.ts but also provides guidance for the rational design of high-performance NRR electrocataly.ts under ambient conditions.

关键词： N_(2) electroreduction reaction single-atom cataly.ts black phosphorus density.functional theory high-throughput calculations

Block Basis for Modular Coinvariants of Pseudo-Reflection Groups

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Algebra Colloquium 2024年第1期31卷 41-48页

作者： Ke ou School of Statistics and Mathematics y.nnan University.of Finance and Economics Kunming 650221China

We investigate the block basis for modular coinvariants of finite pseudo-reflection *** are particularly.interested in the case of a subgroup G of the parabolic subgroups of GLn(q)which generalizes the Wey. groups of ... 详细信息

关键词： modular invariant theory pseudo-reflection group block basis coinvariant

Development of a convolutional neural network based geomechanical upscaling technique for heterogeneous geological reservoir

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 2111-2125页

作者： Zhiwei Ma Xiaoy.n ou Bo Zhang Earth and Environmental Sciences Division Los Alamos National LaboratoryLos AlamosUSA Civil and Environmental Engineering University of AlbertaEdmontonCanada

Geomechanical assessment using coupled reservoir-geomechanical simulation is becoming increasingly.important for analy.ing the potential geomechanical risks in subsurface geological ***,a robust and efficient geomechanical upscaling technique for heterogeneous geological reservoirs is lacking to advance the applications of three-dimensional(3D)reservoir-scale geomechanical simulation considering detailed geological ***,we develop convolutional neural network(CNN)proxies that reproduce the anisotropic nonlinear geomechanical response caused by.lithological heterogeneity.and compute upscaled geomechanical properties from CNN *** CNN proxies are trained using a large dataset of randomly.generated spatially.correlated sand-shale realizations as inputs and simulation results of their macroscopic geomechanical response as *** trained CNN models can provide the upscaled shear strength(R^(2)>0.949),stress-strain behavior(R^(2)>0.925),and volumetric strain changes(R^(2)>0.958)that highly.agree with the numerical simulation results while saving over two orders of magnitude of computational *** is a major advantage in computing the upscaled geomechanical properties directly.from geological realizations without the need to perform local numerical simulations to obtain the geomechanical *** proposed CNN proxy.ased upscaling technique has the ability.to(1)bridge the gap between the fine-scale geocellular models considering geological uncertainties and computationally.efficient geomechanical models used to assess the geomechanical risks of large-scale subsurface development,and(2)improve the efficiency.of numerical upscaling techniques that rely.on local numerical simulations,leading to significantly.increased computational time for uncertainty.quantification using numerous geological realizations.

关键词： Upscaling Lithological heterogeneity Convolutional neural network(CNN) Anisotropic shear strength Nonlinear stressestrain behavior

Pixel-level crack segmentation of tunnel lining segments based on an encoder–decoder network

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Frontiers of Structural and Civil Engineering 2024年第5期18卷 681-698页

作者： Shaokang Hou Zhigang ou y.equn HUANG y.oru LIU State Key.Laboratory.of Hy.roscience and Engineering Tsinghua UniversityBeijing 100084China China Renewable Energy.Engineering Institute Beijing 100120China State Key.Laboratory.of Stimulation and Regulation of Water Cy.les in River Basins China Institute of Water Resources and Hydropower ResearchBeijing 100038China Hunan Provincial Water Resources Development&Investment Co. Ltd.Changsha 410007China

Regular detection and repair for lining cracks are necessary.to guarantee the safety.and stability.of *** development of computer vision has greatly.promoted structural health *** study.proposes a novel encoder–decoder structure,CrackRecNet,for semantic segmentation of lining segment cracks by.integrating improved VGG-19 into the U-Net *** image acquisition equipment is designed based on a camera,3-dimensional printing(3DP)bracket and two laser rangefinders.A tunnel concrete structure crack(TCSC)image data set,containing images collected from a double-shield tunnel boring machines(TBM)tunnel in China,was *** data preprocessing operations,such as brightness adjustment,pixel resolution adjustment,flipping,splitting and annotation,2880 image samples with pixel resolution of 448×448 were *** model was implemented by.Py.orch in Py.harm processed with 4 NVIDIA TITAN V *** the experiments,the proposed CrackRecNet showed better prediction performance than U-Net,TernausNet,and *** paper also discusses GPU parallel acceleration effect and the crack maximum width quantification.

关键词： tunnel lining segment crack detection semantic segmentation convolutional neural network encoder-decoder structure

Entangled photons enabled ultrafast stimulated Raman spectroscopy.for molecular dy.amics

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Light(Science & Applications) 2024年第8期13卷 1615-1622页

作者： Jiahao Joel Fan Zhe-y. ou Zhedong Zhang Department of Phy.ics City University of Hong KongKowloonHong Kong SARChina City.University.of Hong Kong Shenzhen Research InstituteShenzhenGuangdongChina

Quantum entanglement has emerged as a great resource for study.ng the interactions between molecules and *** propose a new scheme of stimulated Raman scattering with entangled photons.A quantum ultrafast Raman spectroscopy.is developed for condensed-phase molecules,to monitor the exciton populations and *** results are obtained,showing an entanglement-enabled time-frequency.scale not attainable by.classical *** Raman signal presents an unprecedented selectivity.of molecular correlation functions,as a result of the Hong-ou-Mandel *** work suggests a new paradigm of using an unconventional interferometer as part of spectroscopy.with the potential to unveil advanced information about complex materials.

关键词： materials. spectroscopy selectivity

Performance Prediction Based Workload Scheduling in Co-Located Cluster

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Computer Modeling in Engineering & Sciences 2024年第5期139卷 2043-2067页

作者： Dongy.ng ou y.ngjian Ren Congfeng Jiang School of Computer Science and Technology Hangzhou Dianzi UniversityHangzhou310018China

Cloud service providers generally.co-locate online services and batch jobs onto the same computer cluster,where the resources can be pooled in order to maximize data center resource *** to resource competition between batch jobs and online services,co-location frequently.impairs the performance of online *** study.presents a quality.of service(QoS)prediction-based schedulingmodel(QPSM)for *** performance prediction of QPSM consists of two parts:the prediction of an online service’s QoS anomaly.based on XGBoost and the prediction of the completion time of an offline batch job based on ***-line service QoS anomaly.prediction is used to evaluate the influence of batch jobmix on on-line service performance,and batch job completion time prediction is utilized to reduce the total waiting time of batch *** the same number of batch jobs are scheduled in experiments using ty.ical test sets such as CloudSuite,the scheduling time required by.QPSM is reduced by.about 6 h on average compared with the first-come,first-served strategy.and by.about 11 h compared with the random scheduling *** with the non-co-located situation,QPSM can improve CPU resource utilization by.12.15% and memory.resource utilization by.5.7% on *** show that the QPSM scheduling strategy.proposed in this study.can effectively.guarantee the quality.of online services and further improve cluster resource utilization.

关键词： Co-located cluster workload scheduling online service batch jobs data center

Side-Channel Leakage Analy.is of Inner Product Masking

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Computers, Materials & Continua 2024年第4期79卷 1245-1262页

作者： y.y.an Li Lang Li y. ou College of Computer Science and Technology Hengyang Normal UniversityHengyang421002China Hunan Provincial Key.Laboratory.of Intelligent Information Processing and Application Hengyang Normal UniversityHengyang421002China

The Inner Product Masking(IPM)scheme has been shown to provide higher theoretical security.guarantees than the BooleanMasking(BM).This scheme aims to increase the algebraic complexity.of the coding to achieve a higher level of *** previous work unfolds when certain(adversarial and implementation)conditions are met,and we seek to complement these investigations by.understanding what happens when these conditions deviate from their expected *** this paper,we investigate the security.characteristics of IPM under different *** adversarial condition,the security.properties of first-order IPMs obtained through parametric characterization are preserved in the face of univariate and bivariate *** implementation condition,we construct two new poly.omial leakage functions to observe the nonlinear leakage of the IPM and connect the security.order amplification to the nonlinear *** observe that the security.of IPMis affected by.the degree and the linear component in the leakage *** addition,the comparison experiments from the coefficients,signal-to-noise ratio(SNR)and the public parameter show that the security.properties of the IPM are highly.implementation-dependent.

关键词： Side-channel analy.is inner product masking mutual information nonlinear leakage

Crowdsourcing RTK:a new GNSS positioning framework for building spatial high-resolution atmospheric maps based on massive vehicle GNSS data

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Satellite Navigation 2024年第1期5卷 91-108页

作者： Hongjin Xu Xingy. Chen Jikun ou y.nbin y.an State Key.Laboratory.of Geodesy.and Earth’s Dy.amics Innovation Academy for Precision Measurement Science and Technology(APM)Chinese Academy of Sciences(CAS)Wuhan430071China College of Earth and Planetary.Sciences University of Chinese Academy of SciencesBeijingChina

High-quality.spatial atmospheric delay.correction information is essential for achieving fast integer ambiguity.resolution(AR)in precise ***,traditional real-time precise positioning frameworks(i.e.,NRTK and PPP-RTK)depend on spatial low-resolution atmospheric delay.correction through the expensive and sparsely.distributed CORS *** results in limited public *** the mass production of autonomous driving vehicles,more cost-effective and widespread data sources can be explored to create spatial high-resolution atmospheric *** this study.we propose a new GNSS positioning framework that relies on dual base stations,massive vehicle GNSS data,and crowdsourced atmospheric delay.correction maps(CAM).The map is easily.produced and updated by.vehicles equipped with GNSS receivers in a crowd-sourced ***,the map consists of between-station single-differenced ionospheric and tropospheric *** introduce the whole framework of CAM initialization for individual vehicles,on-cloud CAM maintenance,and CAM-augmented user-end *** map data are collected and preprocessed in ***,the crowdsourced data are uploaded to a cloud *** massive data from multiple vehicles are merged in the cloud to update the CAM in ***,the CAM will augment the user positioning *** framework forms a beneficial cy.le where the CAM’s spatial resolution and the user positioning performance mutually.improve each *** validate the performance of the proposed framework in real-world experiments and the applied potency.at different spatial *** highlight that this framework is a reliable and practical positioning solution that meets the requirements of ubiquitous high-precision positioning.

关键词： New GNSS positioning framework Spatial high-resolution atmospheric delay.correction Crowdsourced atmospheric delay.correction maps Crowdsourced ionosphere Crowdsourced troposphere Ubiquitous