检索结果-南通市图书馆

BGNN: Behavior-aware graph neural network for heterogeneous session-based recommendation

Frontiers of Computer Science 2023年第5期17卷 103-118页

作者： Jinwei LUO mingkai HE Weike pan Zhong ming College of Computer Science and Software Engineering Shenzhen UniversityShenzhen 518060China National Engineering Laboratory for Big Data System Computing Technology Shenzhen UniversityShenzhen 518060China

Session-based recommendation(SBR)and multibehavior recommendation(MBR)are both important problems and have attracted the attention of many researchers and *** from SBR that solely uses one single type of behavior sequences and MBR that neglects sequential dynamics,heterogeneous SBR(HSBR)that exploits different types of behavioral information(e.g.,examinations like clicks or browses,purchases,adds-to-carts and adds-to-favorites)in sequences is more consistent with real-world recommendation scenarios,but it is rarely *** efforts towards HSBR focus on distinguishing different types of behaviors or exploiting homogeneous behavior transitions in a sequence with the same type of ***,all the existing solutions for HSBR do not exploit the rich heterogeneous behavior transitions in an explicit way and thus may fail to capture the semantic relations between different types of ***,all the existing solutions for HSBR do not model the rich heterogeneous behavior transitions in the form of graphs and thus may fail to capture the semantic relations between different types of *** limitation hinders the development of HSBR and results in unsatisfactory *** a response,we propose a novel behavior-aware graph neural network(BGNN)for *** BGNN adopts a dual-channel learning strategy for differentiated modeling of two different types of behavior sequences in a ***,our BGNN integrates the information of both homogeneous behavior transitions and heterogeneous behavior transitions in a unified *** then conduct extensive empirical studies on three real-world datasets,and find that our BGNN outperforms the best baseline by 21.87%,18.49%,and 37.16%on average correspondingly.A series of further experiments and visualization studies demonstrate the rationality and effectiveness of our *** exploratory study on extending our BGNN to handle more than two types of behaviors show that our BGNN can e

关键词： session-based recommendation graph neural network heterogeneous behaviors

来源：

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

Slip Model Used for Prediction of r Value of BCC Metal Sheets from ODF Coefficients

引用

Journal of Iron and Steel Research International 2000年第1期7卷 36-38页

作者： pan Hao WANG Xiao-ming Central Iron &.Steel Research Institute

Different slip models were used for prediction of r value of BCC metal sheets from ODF *** to the maximum plastic work theory developed by Bishop and Hill,it is expected that the higher of Taylor factors given by a slip’ model,the better prediction obtained based on the *** this point of view,a composed slip model of BCC metals was *** on the model,the agreement of predicted r values for deep drawing steels with experimental ones is excellent.

关键词： bcc metals r values slip model texture

来源：

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

Flexible scheduling model of crude oil operations under crude supply disturbance

引用

Science China Chemistry 2009年第3期52卷 387-400页

作者： ming pan Yu Qian XiuXi Li School of Chemical and Energy Engineering South China University of Technology Guangzhou 510640 China

Today’s changeable market and resultant disturbance of crude oil supply require agile and flexible scheduling of crude oil operation. The objective of flexible scheduling is to keep stable crude oil op-eration and satisfy production demands under the circumstances of supply disturbance. In this paper, a new mixed integer non-linear programming (MINLP) formulation is set up for crude oil scheduling firstly, and then some heuristic rules worked out by some experts are proposed to linearize bilinear terms and prefix some binary variables in the MINLP model. These rules not only reduce the complexity of the MINLP model, but also can be used to solve the scheduling problems in various conditions. In case study, the new model with heuristic rules and the best models reported in the literature are com-pared and evaluated in three benchmark examples in the normal situation, and then three abnormal situations of supply delay are considered based on the new approach. The results of case study show that the new flexible approach can handle crude oil scheduling problems efficiently in both normal and abnormal conditions.

关键词： safety of crude supply crude oil operation flexible scheduling mathematical model safety stock

来源：

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

Tourist Behaviors in Wetland Park:A Preliminary Study in Xixi National Wetland Park,Hangzhou,China

引用

Chinese Geographical Science 2010年第1期20卷 66-73页

作者： pan Lili CUI Lijuan WU ming College of Tourism Zhejiang Gongshang University Hangzhou 310018 China Institute of Wetland Research Chinese Academy of Forestry Beijing 100091 China Laboratory of Tree Breeding and Cultivation State Forestry of Administration Beijing 100091 China Research Institute of Subtropical Forestry Chinese Academy of Forestry Hangzhou 311400 China

Public education as well as tourism and leisure are the two important functions of national wetland park, and tourist behaviors act as the guiding factor in the national wetland park construction and *** the first national wetland park in China, Xixi National Wetland Park, located in Hangzhou City, Zhejiang Province, will give constructive instructions to the construction and management of other wetland parks and ecotourism *** paper analyzed the tourist behaviors in Xixi National Wetland *** the observation, in-depth interview and questionnaire, the results show that tourists in wetland parks are different from those in the other common destinations, and they are also different from those strict *** fact, the tourists in wetland park have unique characteristics, such as the intense perception to the functions of wetland ecosystem and the environment impact *** tourists are preferred to natural landscapes in their motivations and *** landscapes are the main image to those tourists in the Xixi National Wetland *** expectation, experience and satisfaction are all critical factors for the success of the planning and management in national wetland *** on the results, some measures for the sustainable development of wetland parks, including to optimize wetland theme landscape and tourism products, to improve tourist facilities and services, to enhance quality of visitor experiences, and to implement total quality management based on tourist characteristics, are given to national wetland park ecotourism.

关键词： tourist behavior ecotourism Xixi National Wetland Park China

来源：

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

Anisotropic characteristics of layered backfill:Mechanical properties and energy dissipation

引用

Journal of Rock Mechanics and Geotechnical Engineering 2023年第12期15卷 3188-3208页

作者： Huisheng Qu Lang Liu Yonglu suo Mengbo Zhu pan Yang Caixing Zhang Geng Xie Energy School Xi’an University of Science and TechnologyXi’an710054China Key Laboratory of Western Mines and Hazards Prevention Ministry of Education of ChinaXi’an710054China

Layered backfill is commonly used in mining operations,and its mechanical behavior is strongly influenced by delamination *** this study,13 specimens with different numbers of delamination and delamination angle were prepared to investigate the anisotropic mechanical behavior,energy dissipation characteristics and crack development of backfill.P-wave velocity,uniaxial compression,scanning electron microscope(SEM),and acoustic emission(AE)experiments were *** results indicate that:(1)The P-wave velocity has linear and elliptical relationships with the number of delamination surface and delamination angle,respectively;the strength,delamination parameters and P-wave velocity show a high degree of coincidence in terms of their function relationship,which can realize the rapid prediction of strength.(2)The microstructure of the delaminated surface is looser than that of the matrix,leading to a decrease in strength and an increase at the pore-fissure compaction *** number and angle of delamination increase linearly with the anisotropy coefficient.(3)The energy evolution in angle-cut backfill can be divided into four stages,with a decrease in the proportion of elastic energy at the initiation stress and peak stress with increasing number of delamination planes and delamination angle.(4)Crack development increases with the number of delamination surface and delamination angle,resulting in a decrease in energy dissipation coefficient and peak AE *** findings provide valuable insights for the design of filling materials and processes in mining operations.

关键词： Layered backfill Delamination par ameters Anisotropic mechanical behavior P-wave velocity Energy dissipation characteristics Acoustic emission(AE)

来源：

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

Cube texture evolution of Ni5W alloy substrates and La-Zr-O buffer layer of YBCO-coated conductors

引用

Rare Metals 2022年第11期41卷 3887-3894页

作者： pan Wang Hui Tian Hong-Li suo Cheng Ren Ya-Ru Liang Lin Ma Min Liu College of Materials Science and Engineering University of TechnologyBeijing100124China

The cube texture evolution of Ni-5 at%W alloy deformed up to a very high strain was thoroughly investigated by X-ray diffraction(XRD) and electron back-scattered diffraction(EBSD) during the process of deformation,recrystallization and grain growth.A typical copper-type rolling texture,mainly consisting of components of S,copper and brass orientations,is obtained after heavy cold *** fraction of rolling texture is slightly strengthened during recovery and then strongly reduced during recry stallization *** cube texture is formed by consuming the rolling texture components during the discontinuous recry stallization *** cube grains have a size advantage with respect to the non-cube grains.A strong cube-textured Ni5 W alloy substrate with cube texture area fraction of 98.2 %(<10°) is obtained after annealing at 1050℃ for 1 *** full width half maximum(FWHM) values for the X-ray(111) φ-scan and the(002)ω-scan of this substrate are 5.84° and 4.76°,***,the area fraction of {001}(110) orientation of the epitaxially grown La_(2)Zr_(2)O_(7) buffer layer is 97.1 %(<10°),and the FWHM values of(111) φ-scan and(002)ω-scan are 5.22° and 5.00°,respectively.

关键词： Ni5W alloy Recrystallization Texture Microstructure La_(2)Zr_(2)O_(7)

来源：

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

Diophantine equations and Fermat's last theorem for multivariate(skew-)polynomials

引用

Applied Mathematics(A Journal of Chinese Universities) 2024年第1期39卷 159-173页

作者： pan Jie JIA Yu-ming LI Fang School of Mathematical Sciences Zhejiang UniversityHangzhou 310058China Henan Experimental High School Zhengzhou 450003China

Fermat’s Last Theorem is a famous theorem in number theory which is diﬃcult to ***,it is known that the version of polynomials with one variable of Fermat’s Last Theorem over C can be proved very *** aim of this paper is to study the similar problems about Fermat’s Last Theorem for multivariate(skew)-polynomials with any characteristic.

关键词： Fermat's last theorem polynomial ring skew polynomial ring

来源：

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

Enhancement of the orientation and adhesion of Al films on LiNbO_3 with Ni underlayer

引用

Rare Metals 2005年第4期24卷 363-369页

作者： LI Dongmei pan Feng NIU Jiebin LIU ming Laboratory of Advanced Materials Department of Materials Science and Engineering Tsinghua University Beijing 100084 China Institute of Chemistry and Chemical Engineering of Xinjiang University Wulumuqi 830046 China Institute of Microelectronics Chinese Academy of Sciences Beijing 100029 China

Al/Ni films were deposited on 128° Y-X LiNbO3 substrates by e-beam deposition. The influence of Ni underlayer on the microstructure, adhesion and resistivity of the Al/Ni films was investigated. It was found that Al films deposited on Ni underlayer thinner than 5 nm possessed strong texture. The textured Al/Ni films had a superior adhesion. Their resistivity decreased after annealing treatment at 200℃ for 30 min. With the textured Al/Ni films, a 2,30 GHz-range image-impedance connection SAW （Surface Acoustic Wave） filter was successfully fabricated.

关键词： metal materials Al/Ni films electron-beam evaporation microstructure surface acoustic wave

来源：

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

Investigation of turbulence and skin friction modification in particle-laden channel flow using lattice Boltzmann method

引用

Applied Mathematics and Mechanics(English Edition) 2018年第4期39卷 477-488页

作者： ming pan Qing xiang Shuai TANG Yuhong DONG Shanghai Institute of Applied Mathematics and Mechanics Shanghai UniversityShanghai 200072China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai UniversityShanghai 200072China

Interaction between turbulence and particles is investigated in a channel flow. The fluid motion is calculated using direct numerical simulation(DNS) with a lattice Boltzmann(LB) method, and particles are tracked in a Lagrangian framework through the action of force imposed by the fluid. The particle diameter is smaller than the Kolmogorov length scale, and the point force is used to represent the feedback force of particles on the turbulence. The effects of particles on the turbulence and skin friction coefficient are examined with different particle inertias and mass loadings. Inertial particles suppress intensities of the spanwise and wall-normal components of velocity, and the Reynolds shear stress. It is also found that, relative to the reference particle-free flow,the overall mean skin-friction coefficient is reduced by particles. Changes of near wall turbulent structures such as longer and more regular streamwise low-speed streaks and less ejections and sweeps are the manifestation of drag reduction.

关键词： lattice Boltzmann(LB) equation particle channel flow turbulence modulation skin friction

来源：

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

Drag reduction of turbulent channel flows over an anisotropic porous wall with reduced spanwise permeability

引用

Applied Mathematics and Mechanics(English Edition) 2019年第7期40卷 1041-1052页

作者： Qingxiang LI ming pan Quan ZHOU Yuhong DONG Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China Shanghai Key Laboratory of Mechanics in Energy Engineering Shanghai University Shanghai 200072 China

The direct numerical simulation (DNS) is carried out for the incompressible viscous turbulent flows over an anisotropic porous wall. Effects of the anisotropic porous wall on turbulence modifications as well as on the turbulent drag reduction are investigated. The simulation is carried out at a friction Reynolds number of 180, which is based on the averaged friction velocity at the interface between the porous medium and the clear fluid domain. The depth of the porous layer ranges from 0.9 to 54 viscous units. The permeability in the spanwise direction is set to be lower than the other directions in the present simulation. The maximum drag reduction obtained is about 15.3% which occurs for a depth of 9 viscous units. The increasing of drag is addressed when the depth of the porous layer is more than 25 wall units. The thinner porous layer restricts the spanwise extension of the streamwise vortices which suppresses the bursting events near the wall. However, for the thicker porous layer, the wall-normal fluctuations are enhanced due to the weakening of the wall-blocking effect which can trigger strong turbulent structures near the wall.

关键词： direct numerical simulation (DNS) anisotropic porous medium drag reduction turbulent open channel flow

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：