检索结果-南通市图书馆

Meta-path reasoning of knowledge graph for commonsense question answering

在线全文

学校读者我要写书评

暂无评论

Frontiers of Computer Science 2024年第1期18卷 49-59页

作者： miao zhang Tingting HE Ming DONG National Engineering Research Center for E-Learning Central China Normal UniversityWuhan 430079China Hubei Provincial Key Laboratory of Artificial Intelligence and Smart Learning Central China Normal UniversityWuhan 430079China National Language Resources Monitoring&Research Center for Network Media Central China Normal UniversityWuhan 430079China School of Computer Central China Normal UniversityWuhan 430079China

Commonsense question answering(CQA)requires understanding and reasoning over QA context and related commonsense knowledge,such as a structured Knowledge Graph(KG).Existing studies combine language models and graph neural networks to model ***,traditional knowledge graph are mostly concept-based,ignoring direct path evidence necessary for accurate *** this paper,we propose MRGNN(Meta-path Reasoning Graph Neural Network),a novel model that comprehensively captures sequential semantic information from concepts and *** MRGNN,meta-paths are introduced as direct inference evidence and an original graph neural network is adopted to aggregate features from both concepts and paths *** conduct sufficient experiments on the CommonsenceQA and OpenBookQA datasets,showing the effectiveness of ***,we conduct further ablation experiments and explain the reasoning behavior through the case study.

关键词： question answering knowledge graph graph neural network meta-path reasoning

Bending and vibration of two-dimensional decagonal quasicrystal nanoplates via modified couple-stress theory

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

Applied Mathematics and Mechanics(English Edition) 2022年第3期43卷 371-388页

作者： miao zhang Junhong GUO Yansong LI Department of Mechanics Inner Mongolia University of TechnologyHohhot 010051China School of Aeronautics Inner Mongolia University of TechnologyHohhot 010051China College of Architecture and Civil Engineering Guangdong University of Petrochemical TechnologyMaoming 525000Guangdong ProvinceChina

Based on the modified couple-stress theory,the three-dimensional(3D)bending deformation and vibration responses of simply-supported and multilayered twodimensional(2D)decagonal quasicrystal(QC)nanoplates are *** surface loading is assumed to be applied on the top surface in the bending analysis,the tractionfree boundary conditions on both the top and bottom surfaces of the nanoplates are used in the free vibration analysis,and a harmonic concentrated point loading is applied on the top surfaces of the nanoplates in the harmonic response *** general solutions of the extended displacement and traction vectors for the homogeneous QC nanoplates are derived by solving the eigenvalue problem reduced from the final governing equations of motion with the modified couple-stress *** utilizing the propagator matrix method,the analytical solutions of the displacements of bending deformation for the phonon and phason fields,the natural frequency of free vibration,and the displacements of the harmonic responses of the phonon and phason fields are *** examples are illustrated to show the effects of the quasiperiodic direction,the material length scale parameter,and the the stacking sequence of the nanoplates on the bending deformation and vibration responses of two sandwich nanoplates made of QC and crystal materials.

关键词： quasicrystal(QC) bending vibration layered nanoplate

Numerical study of a supercritical airfoil/wing with variable-camber technology

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2020年第7期33卷 1850-1866页

作者： Wei NIU Yufei zhang Haixin CHEN miao zhang School of Aerospace Engineering Tsinghua UniversityBeijing 100084China Shanghai Aircraft Design and Research Institute Shanghai 201210China

Variable-camber technology is considered an effective way to adaptively improve the aerodynamic performance of aircraft under various flight *** paper studies the aerodynamic characteristics of the trailing-edge variable-camber technology by means of Computational Fluid Dynamics(CFD)and a drag decomposition ***-edge variable-camber technology can be simply realized by the continuous deflection of the flaps and ailerons of a wing.A supercritical airfoil is used to study the two-dimensional effect of variable-camber technology,and a wide-body airplane model is used to validate the three-dimensional improvement in the wing’s airfoil made by variable-camber *** optimization strategy for airfoil that incorporates variable-camber technology is *** optimization results demonstrate that the proposed method can obtain better results than the traditional segregated shape optimization.

关键词： Aerodynamic optimization CST method Drag decomposition Supercritical airfoil/wing Variable-camber technology

Index Estimates for Free Boundary f-minimal Hypersurfaces

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9期39卷 1727-1735页

作者： Niang Chen Jian Quan Ge miao miao zhang School of Mathematical Sciences Laboratory of Mathematics and Complex SystemsBeijing Normal UniversityBeijing100875P.R.China

We prove that the index is bounded from below by a linear function of its first Betti number for any compact free boundary f-minimal hypersurface in certain positively curved weighted manifolds.

关键词： Index f-minimal hypersurfaces free boundary the first Betti number

A destructive field study on the behavior of piles under tension and compression

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2011年第4期12卷 291-300页

作者： Zhong-miao zhang Qian-qing zhang Feng YU MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering Zhejiang University Hangzhou 310058 China Institute of Geotechnieal Engineering Zhejiang University Hangzhou 310058 China School of Civil Engineering and Architecture Zhejiang Sci-Tech University Hangzhou 310018 China

This paper involves a series of destructive full-scale load tests on long bored piles instrumented with strain gauges along the shafts,including two compression and two tension loading *** load-displacement response,axial force,skin friction,and the thresholds of the slip displacement for fully mobilizing the skin resistances in different soils are ***,the theoretical solution for estimating the pile tip settlement under compression was adopted to analyze the test *** was found that the measured skin frictions for the piles under compression were about 6% to 42% higher than the estimated values of the cone penetration tests(CPTs),whereas the measured skin frictions in the uplift cases were about 16% to 50% smaller than the estimated *** addition,the average limited skin frictions for the tension piles were about 0.36 to 0.78 times the average ultimate skin frictions for the piles under *** also can be indicated that the skin friction along the pile depth approached the limited state,and decreased from a peak value with increasing loads.

关键词： Destructive full-scale test Load-displacement response Axial force Pile-soil relative displacement Skin friction

Drag prediction method of powered-on civil aircraft based on thrust drag bookkeeping

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2015年第4期28卷 1023-1033页

作者： zhang Yufei Chen Haixin Fu Song zhang miao zhang Meihong School of Aerospace Engineering Tsinghua University Shanghai Aircraft Design and Research Institute

A drag prediction method based on thrust drag bookkeeping（TDB） is introduced for civil jet propulsion/airframe integration performance *** method is derived from the control volume theory of a powered-on *** problem of the TDB is identified to be accurate prediction of velocity coefficient of the powered-on *** of CFD solver is validated by test cases of the first AIAA Propulsion Aerodynamics *** the TDB method is applied to thrust and drag decomposing of a realistic aircraft.A linear relation between the computations assumed free stream Mach number and the velocity coefficient result is *** thrust losses caused by nozzle internal drag and pylon scrubbing are obtained by the isolated nacelle and mapped on to the in-flight whole configuration *** of the powered-on condition are investigated by comparing through-flow configuration with powered-on *** variance on aerodynamic coefficients and pressure distribution is numerically studied.

关键词： Discharge coefficient Drag prediction Powered-on configuration Thrust drag bookkeeping Velocity coefficient

A Law of Large Numbers Under the Nonlinear Expectation

在线全文

学校读者我要写书评

暂无评论

Acta Mathematicae Applicatae Sinica 2015年第4期31卷 953-962页

作者： miao zhang Zeng-jing CHEN Qilu Securities Institute for Financial studies and Department of Mathematics Shandong University

In this paper, we derive a law of large numbers under the nonlinear expectation generated by backward stochastic differential equations driven by G-Brownian motion.

关键词： law of large numbers nonlinear expectation backward stochastic differential equation

Anion-hosting cathodes for current and late-stage dual-ion batteries

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第5期67卷 1485-1509页

作者： miao zhang Wenyong zhang Fan zhang Chun-Sing Lee Yongbing Tang School of Chemistry and Materials Science Guangdong University of EducationGuangzhou 510303China Advanced Energy Storage Technology Research Center Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China Center of Super-Diamond and Advanced Film(COSDAF) City University of Hong KongKowloon 999077China

Anion-hosting cathodes capable of reversibly storing large-size anions play a leading role in dual-ion batteries(DIBs). The purpose of the present review is to summarize the most promising anion-hosting cathodes for current and late-stage DIBs. This review first summarizes the developments in conventional graphite cathodes, especially the latest advances in the graphiterelated research. Next, organic cathodes for the anion storage are discussed, including aromatic amine polymers, heterocyclic polymers, bipolar compounds, and all-carbon-unsaturated compounds. Then, the review focuses on the conversion-type cathodes with high theoretical specific capacities. Finally, the future research directions of the cathodes of DIBs are proposed.

关键词： dual-ion batteries organic cathodes graphite cathodes conversion-type cathodes

Nonlinear density fluctuation field theory for large scale structure

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and Astrophysics 2009年第5期9卷 501-508页

作者： Yang zhang Hai-Xing miao Key Laboratory of Galactic and Cosmological Research Center for Astrophysics University of Science and Technology of China Hefei 230026 China

We develop an effective field theory of density fluctuations for a Newtonian self-gravitating N-body system in quasi-equilibrium and apply it to a homogeneous universe with small density fluctuations. Keeping the density fluctuations up to second or- der, we obtain the nonlinear field equation of 2-pt correlation ξ（r）, which contains 3-pt correlation and formal ultra-violet divergences. By the Groth-Peebles hierarchical ansatz and mass renormalization, the equation becomes closed with two new terms beyond the Gaussian approximation, and their coefficients are taken as parameters. The analytic solution is obtained in terms of the hypergeometric functions, which is checked numerically. With one single set of two fixed parameters, the correlation ξ（r） and the corresponding power spectrum P（k） simultaneously match the results from all the major surveys, such as APM, SDSS, 2dfGRS, and REFLEX. The model gives a unifying understanding of several seemingly unrelated features of large scale structure from a field-theoretical perspective. The theory is worth extending to study the evolution effects in an expanding universe.

关键词： cosmology large-scale structure-- cosmology theory -- galaxies clusters general -- gravitation --- hydrodynamics -- instabilities