检索结果-南通市图书馆

Relational graph location network for multi-view image localization

系统工程与电子技术：英文版 2023年第2期34卷 460-468页

作者： YANG Yukun liu xiangdong School of Automation Beijing Institute of TechnologyBeijing 100081China

In multi-view image localization task,the features of the images captured from different views should be fused properly.This paper considers the classification-based image localization problem.We propose the relational graph location network(RGLN)to perform this task.In this network,we propose a heterogeneous graph construction approach for graph classification tasks,which aims to describe the location in a more appropriate way,thereby improving the expression ability of the location representation module.Experiments show that the expression ability of the proposed graph construction approach outperforms the compared methods by a large margin.In addition,the proposed localization method outperforms the compared localization methods by around 1.7%in terms of meter-level accuracy.

关键词： multi-view image localization graph construction heterogeneous graph graph neural network

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

Experimental study on the electrohydrodynamic deformation of droplets in a combined DC electric field and shear flow field: 收藏
分享
引用; Fundamental Research 2023年第2期3卷 274-287页; 作者： Xiangdong Liu Guanqiu Hao Bo Li Yongping Chen Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China School of Electrical Energy and Power EngineeringYangzhou UniversityYangzhou 225009China Laser Fusion Research Center China Academy of Engineering PhysicsMianyang 621900China; A visualization experiment was conducted to investigate the electrohydrodynamic deformation of droplets in a combined DC electric field and shear flow field.Detailed experimental data on both the transient and steady ... 详细信息; A visualization experiment was conducted to investigate the electrohydrodynamic deformation of droplets in a combined DC electric field and shear flow field.Detailed experimental data on both the transient and steady droplet deformation parameters(D)and orientations(ϕ_(d))are provided at R>S and RS and RS and RS and higher under R; 关键词： Droplet deformation Electrohydrodynamics Electric field Shear flow Prediction model; 来源：维普期刊数据库评论; 学校读者我要写书评

暂无评论

Controlled preparation of PAMS hollow core microcapsules with high uniformity and its application in the production of GDP fuel capsules for ICF engineering

收藏
分享
引用

Fundamental Research 2023年第4期3卷 602-610页

作者： Qiang Chen Meifang liu Xiangdong Liu Bo Li Yongping Chen Laser Fusion Research Center China Academy of Engineering PhysicsMianyang 621900China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China

Uniform poly-α-methylstyrene(PAMS)hollow core microcapsules(HCMs)are widely used as templates to fabricate glow discharge polymer(GDP)fuel capsules,which are fundamental devices for inertial confinement fusion(ICF)en... 详细信息

Uniform poly-α-methylstyrene(PAMS)hollow core microcapsules(HCMs)are widely used as templates to fabricate glow discharge polymer(GDP)fuel capsules,which are fundamental devices for inertial confinement fusion(ICF)engineering.The sphericity and surface finish uniformity of PAMS HCMs are critical for achieving highquality GDP fuel capsules.In this work,millimeter-scale PAMS HCMs were fabricated by a microencapsulation technique.The sphericity and surface finish uniformity were concurrently improved using di-t-butyl peroxide(DTBP).The mechanisms of these effects were also experimentally and theoretically investigated.The results show that DTBP distributes at the O-W2 interface of W1/O/W2 compound droplets,which resists the diffusion of molecules through the O-W2 interface bidirectionally.The resisted diffusion of H_(2)O molecules into the O phase eliminates PAMS HCM surface defects.Additionally,the resistance of fluorobenzene(FB)molecules from diffusing from the O phase into the W2 phase can effectively extend the solidification of W1/O/W2 compound droplets and thus improve the spherical uniformity of the HCMs.Using these improved PAMS HCMs,GDP fuel capsules meeting the stringent requirements for ICF engineering are prepared,and the quality of which is beyond the National Ignition Facility standard.

关键词： Inertial confinement fusion engineering Mass transfer regulation PAMS HCMs Spherical uniformity Surface finish

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

Stochastic maximum principle for partially observed forward-backward stochastic differential equations with jumps and regime switching

收藏
分享
引用

Science China(Information Sciences) 2018年第7期61卷 106-118页

作者： Shuaiqi ZHANG Jie XIONG Xiangdong Liu School of Economics and Commerce Guangdong University of Technology Department of Mathematics University of Macau Department of Mathematics Southern University of Science and Technology Department of Statistics Jinan University

In this article, we consider the partially observed optimal control problem for forward-backward stochastic systems with Markovian regime switching. A stochastic maximum principle for optimal control is developed usin... 详细信息

In this article, we consider the partially observed optimal control problem for forward-backward stochastic systems with Markovian regime switching. A stochastic maximum principle for optimal control is developed using a variational method and filtering technique. Our theoretical results are applied to the motivating example of the risk minimization for portfolio selection.

关键词： partial information Markovian regime-switching stochastic maximum principle forwardbackward stochastic differential equation(FBSDE)

来源：同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

MANUFACTURER'S UNIFORM PRICING AND CHANNEL CHOICE WITH A RETAIL PRICE MARKUP COMMITMENT STRATEGY

收藏
分享
引用

Journal of Systems Science and Systems Engineering 2014年第1期23卷 111-126页

作者： Huihui liu Ming Lei Xiangdong Liu Guanghua School of Management Peking University China Center for International Economic Exchanges

The paper studies channel choice decisions in a multi-channel supply chain under a strategy where there is an ex-ante commitment made on the retail price markup. The market demand is uncertain and dependent on the pri... 详细信息

The paper studies channel choice decisions in a multi-channel supply chain under a strategy where there is an ex-ante commitment made on the retail price markup. The market demand is uncertain and dependent on the price and sales efforts. The results show that in any channel structure, when making order decisions the retailer only examines the price ratio and the fluctuation size of random demand, rather than the channel cost and the retailer＇s marketing efficiency. When the retail price rises, the manufacturer is willing to increase inventory quantity for direct sales, because the manufacturer＇s profit margin is higher in direct channel. The increase in demand fluctuation only affects the degree of channel preference but doesn＇t change the manufacturer＇s channel choice. No matter in which level the price ratio is, when the sales efficiency of retail channel is not high or the demand proportion of direct channel is low, the manufacturer and the retailer will be both apt to choose a dual-channel structure. Then adding a direct channel becomes a marketing strategy, rather than a competitor of the retail channel, and helps the supply chain win more market demand.

关键词： Uniform pricing marketing/sales effort channel choice newsvendor model dual channelsupply chain

来源：维普期刊数据库同方期刊数据库评论

在线全文

维普期刊数据库

同方期刊数据库

学校读者我要写书评

暂无评论

Efficacy of Sishen Wan(四神丸) on dinitrobenzene sulfonic acid-induced ulcerative colitis and its effect on toll-like receptor 2/interleukin-1 receptor-associated kinase-4/nuclear factor-κB signal pathway

收藏
分享
引用

Journal of Traditional Chinese Medicine 2022年第4期42卷 565-575页

作者： ZHANG Zhaohua liu Rong DU Nana ZHU xiangdong School of Basic Medicine Gansu university of Chinese MedicineLanzhou 730000China College of Chinese Medicine Ningxia medical universityYinchuan 750000China Department of Thoracic Surgery Gansu Provincial Cancer HospitalLanzhou 730000China

OBJECTIVE:To investigate the therapeutic effect of Sishen Wan(四神丸,SSW)on ulcerative colitis(UC)induced by dinitrobenzene sulfonic acid and its effect on toll-like receptor 2/interleukin-1 receptor-associated kinase... 详细信息

OBJECTIVE:To investigate the therapeutic effect of Sishen Wan(四神丸,SSW)on ulcerative colitis(UC)induced by dinitrobenzene sulfonic acid and its effect on toll-like receptor 2/interleukin-1 receptor-associated kinase-4/nuclear factor-κB(TLR2/IRAK4/NF-κB)signaling pathway in colonic tissue.METHODS:In this study,120 Sprague–Dawley rats were randomly divided into blank and model groups.The experimental UC model in rats was established by subcutaneous injection of hydrocortisone+senna gavage for 21 d+dinitrobenzene sulfonic acid(DNBS)/ethanol solution enema.The successful model rats were randomly divided into the model group;mesalazine(0.36 g/kg)group;and high-,medium-,and low-dose SSW(24,12,and 6 g/kg)groups.The model and blank groups were gavaged with equal volumes of distilled water once a day for 21 d.The general condition of the rats was observed,and the body mass,fecal properties,and occult blood were recorded for calculating the disease activity index(DAI)score.The colonic tissue of the rats was collected,and its general morphology and pathological form were noted for obtaining the colonic mucosal injury index(CMDI)score.Hematoxylin-eosin staining was used to view the pathological changes of the colon tissue in each group,apoptosis of the cells was detected using terminal deoxynucleotidyl transferase-mediated d UTP nick-end labeling staining,and quantitative real-time polymerase chain reaction was used to measure the expressions of TLR2,myeloid differentiation primary response gene 88(My D88),IRAK4,and NF-κB p65 mRNA in the colon tissue.The expressions of TLR2,My D88,IRAK4,and NF-κB p65 protein were detected using western blotting and immunohistochemistry assay,and the levels of interleukin-1β(IL-1β)and tumor necrosis factor-α(TNF-α)in the colon tissue were determined using enzyme linked immunosorbent assay.RESULTS:Compared with the blank group,the general condition of the model group was relatively poor.The DAI and CMDI scores of the model group increased significantly(P<0.01),the glands and intestinal mucosa d

关键词： colitis,ulcerative toll-like receptor 2 interleukin-1 receptor-associated kinases NF-kappa B signal transduction therapeutic uses Sishen Wan

来源：维普期刊数据库同方期刊数据库评论

在线全文

维普期刊数据库

同方期刊数据库

学校读者我要写书评

暂无评论

A Class of Jump-Diffusion Stochastic Differential System Under Markovian Switching and Analytical Properties of Solutions

收藏
分享
引用

Journal of Systems Science and Information 2020年第1期11卷 17-32页

作者： Xiangdong Liu Zeyu MI Huida CHEN Department of Statistics Jinan UniversityGuangzhou 510632China

Our article discusses a class of Jump-diffusion stochastic differential system under Markovian switching(JD-SDS-MS).This model is generated by introducing Poisson process and Markovian switching based on a normal stoc... 详细信息

Our article discusses a class of Jump-diffusion stochastic differential system under Markovian switching(JD-SDS-MS).This model is generated by introducing Poisson process and Markovian switching based on a normal stochastic differential equation.Our work dedicates to analytical properties of solutions to this model.First,we give some properties of the solution,including existence,uniqueness,non-negative and global nature.Next,boundedness of first moment of the solution to this model is considered.Third,properties about coefficients of JD-SDS-MS is proved by using a right continuous markov chain.Last,we study the convergence of Euler-Maruyama numerical solutions and apply it to pricing bonds.

关键词： stachastic differential system Markovian switching jump-diffusion analytical properties numerical solutions

来源：维普期刊数据库同方期刊数据库评论

在线全文

维普期刊数据库

同方期刊数据库

学校读者我要写书评

暂无评论

Designing ultrastrong and thermally stable FeCrAl alloys with the fine-grained structure

收藏
分享
引用

Journal of Materials Science & Technology 2024年第4期171卷 198-208页

作者： Shuaiyang liu Jinyu Zhang Hui Wang Gang liu xiangdong Ding Jun Sun State Key Laboratory for Mechanical Behavior of Materials Xi’an Jiaotong UniversityXi’an 710049China Science and Technology on Reactor Fuel and Materials Laboratory Nuclear Power Institute of ChinaChengdu 610041China

Designing microstructurally stable FeCrAl alloys with excellent strength-ductility synergy is highly desir-able for their engineering applications.However,due to the preference nucleation of precipitates at grain boun... 详细信息

Designing microstructurally stable FeCrAl alloys with excellent strength-ductility synergy is highly desir-able for their engineering applications.However,due to the preference nucleation of precipitates at grain boundaries(GBs),the improved precipitation strengthening of these alloys is usually accompanied by in-tergranular embrittlement.Here,we propose a novel thermomechanical processing route coupled with the Si alloying strategy via precipitation of coherent deformable Laves precipitates inside equiaxed fine-grains to achieve FeCrAl alloys with ultrahigh yield strength over∼992 MPa,excellent uniform elongation of∼7.6%at room temperature,and superior thermal stability at temperature∼1200℃.The Si alloying not only decreases the stacking fault energy of Laves precipitates favorable for their stacking-fault-mediated deformation but also hinders grain coarsening at 1200℃due to the Si-enrichment favorable for GB pin-ning effects.Our results prove the possibility of achieving the collaborative enhancement of mutually exclusive properties in alloys,such as strength-ductility-thermal stability via nanoprecipitation engineer-ing,and offer a promising route to prepare dispersion-strengthened materials.

关键词： FeCrAl alloys Si alloying Mechanical properties Thermal stability Laves phase

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

A Three-axis PD Control Model for Bumblebee Hovering Stabilization

收藏
分享
引用

Journal of Bionic Engineering 2018年第3期15卷 494-504页

作者： xiangdong Zhang Hao liu Shanghai Jiao Tong University and Chiba University International Cooperative Research Centre (SJTU-CU ICRC) Shanghai Jiao Tong University Shanghai 200240 China Graduate School of Engineering Chiba University Chiba 263-8522 Japan

Flight stabilization in insects is normally achieved through a closed-loop system integrating the intemal dynamics and feedback control. Recent studies have reported that flight instability may exist in most flying in... 详细信息

Flight stabilization in insects is normally achieved through a closed-loop system integrating the intemal dynamics and feedback control. Recent studies have reported that flight instability may exist in most flying insects but how insects achieve the flight stabilization still remains poorly understood. Here we propose a control model specified for bumblebee hovering stabilization by applying a three-axis PD （proportional-derivative）-controller to a free-flying bumblebee computational model with six Degrees of Freedom （DoFs）. Morphological and kinematic models of a realistic bumblebee in hovering are built up based on measurements whereas a versatile bio-inspired dynamic flight simulator is employed in simulations. A simplified flight dynamic model is further developed as a fast model for control parameter tuning. Our results demonstrate that the stabilizing control model is capable of achieving the hovering stabilization with small perturbations in terms of 6-DoF, implying that the simplified linear algorithms can still work reasonably for bumblebee hovering. A further sensitivity analysis of the control parameters reveals that yaw control via manipulating pitch angle of the wing is mostly sensitive, implicating that bumblebee may utilize alternative yaw control strategies.

关键词： flapping bumblebee flight stabilization PD controller multi-axis control

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

Approach and landing guidance design for reusable launch vehicle using multiple sliding surfaces technique

收藏
分享
引用

Chinese Journal of Aeronautics 2017年第4期30卷 1582-1591页

作者： Xiangdong Liu Fengdi ZHANG Zhen LI Yao ZHAO School of Automation Beijing Institute of Technology Beijing 100081 China National Key Laboratory of Complex System Intelligent Control and Decision Beijing Institute of Technology Beijing100081 China China Academy of Launch Vehicle Technology Beijing 100076 China

An autonomous approach and landing（A＆L） guidance law is presented in this paper for landing an unpowered reusable launch vehicle（RLV） at the designated runway touchdown. Considering the full nonlinear point-mass ... 详细信息

An autonomous approach and landing（A＆L） guidance law is presented in this paper for landing an unpowered reusable launch vehicle（RLV） at the designated runway touchdown. Considering the full nonlinear point-mass dynamics, a guidance scheme is developed in threedimensional space. In order to guarantee a successful A＆L movement, the multiple sliding surfaces guidance（MSSG） technique is applied to derive the closed-loop guidance law, which stems from higher order sliding mode control theory and has advantage in the finite time reaching property.The global stability of the proposed guidance approach is proved by the Lyapunov-based method.The designed guidance law can generate new trajectories on-line without any specific requirement on off-line analysis except for the information on the boundary conditions of the A＆L phase and instantaneous states of the RLV. Therefore, the designed guidance law is flexible enough to target different touchdown points on the runway and is capable of dealing with large initial condition errors resulted from the previous flight phase. Finally, simulation results show the effectiveness of the proposed guidance law in different scenarios.

关键词： Finite time control Landing guidance Lyapunov stability Reusable launch vehicle Sliding mode control

来源：维普期刊数据库同方期刊数据库评论

在线全文

维普期刊数据库

同方期刊数据库

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：