检索结果-南通市图书馆

Architecture,Key Technologies and Applications of Load Dispatching in China Power Grid

Journal of Modern Power Systems and Clean Energy 2022年第2期10卷 316-327页

作者： Yu Dong Xin Shan Yaqin Yan Xiwu leng Yi Wang State Grid Corporation of China Beijing 100031China NARI Group Corporation(State Grid Electric Power Research Institute) Nanjing 211000China

With the development of renewable energy and the changes in the characteristics of power grid,it is becoming increasingly difficult to balance power supply and demand in space and *** addition,the requirement for improved dispatching capability of power grid is ***,the potential of flexible load dispatching should be realized,which can promote the large-scale consumption of renewable energy and the construction of new power *** on the analysis of existing load dispatching studies and the differences in the characteristics of domestic and foreign load dispatchings,a technical architecture and several key technologies are proposed for load resources to participate in power grid dispatching under the new situation,i.e.,the autonomous collaborative control system of load *** system implements the multi-layer coordinated control of main,distribution and micro grids(load aggregators).Adjustable load resources are aggregated through an aggregator operation platform and connected with a dispatcher load regulator platform to realize real-time data interaction with dispatching agencies as well as the monitoring,con-trol,and marketing of *** supports the load resources to participate in network-wide dispatching optimization via continuous power *** key technologies such as the control mode,load modeling,dispatching strategy,and safety protection are also *** the closed-loop control of orderly charging piles and energy storage clusters in the North China Power Grid,the feasibility of the proposed architecture and key technologies is *** route has successively supported multiple adjustable load aggregators to partici-pate in the ancillary services market of North China Power Grid for ***,the technical challenges of load resources participating in power grid dispatching under the dual carbon goals are discussed and prospected.

关键词： Automatic power control(APC) load modeling load dispatching renewable energy accommodation situation awareness.

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

4D printing of personalized shape memory polymer vascular stents with negative Poisson’s ratio structure:A preliminary study

引用

Science China(Technological Sciences) 2020年第4期63卷 578-588页

作者： LIN Cheng ZHANG LiJin LIU YanJu LIU LiWu leng JinSong Department of Astronautic Science and Mechanics Harbin Institute of Technology(HIT)Harbin 150001China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology(HIT)Harbin 150080China

Four-dimensional(4D)printing,integrates transformation information into three-dimensional(3D)-printed structures,which means that 3D-printed structures are able to change their shapes,properties,or functionalities over ***,two types of shape memory personalized vascular stents with negative Poisson’s ratio structure are developed via 4D *** genetic algorithm is used to optimize the *** compression tests,radial compression tests and three-point bending tests are carried out to study the mechanical properties of the *** addition,fluid-structure interaction and stress distribution during the shape recovery process are investigated based on finite element *** shape memory behaviors of the stents are excellent and in vitro feasibility tests demonstrate that the stents can expand the simulated narrow blood vessel ***,4D printed shape memory stents with negative Poisson’s ratio structure are highly promising for the treatment of vascular stenosis.

关键词： shape memory polymer 4D printing biodegradable vascular stents finite element analysis negative Poisson's ratio

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

A Unified Motion Generation Approach for Quadruped L-S Walk and Trot Gaits Based on Linear Model Predictive Control

引用

Journal of Bionic Engineering 2024年第4期21卷 1707-1719页

作者： Yapeng Shi Zhicheng He Xiaokun leng Songhao Piao Lining Sun Harbin Institute of Technology No.92 West Dazhi StreetHarbin150001HeilongjiangChina Yanshan University No.438 West Hebei AvenueQinhuangdao066004HebeiChina

The goal of this paper is to develop a unified online motion generation scheme for quadruped lateral-sequence walk and trot gaits based on a linear model predictive control ***,the dynamics of the linear pendulum model is formulated over a predictive horizon by dimensional *** gait pattern conversion,the lateral-sequence walk and trot gaits of the quadruped can be regarded as unified biped gaits,allowing the dynamics of the linear inverted pendulum model to serve quadruped motion *** addition,a simple linearization of the center of pressure constraints for these quadruped gaits is developed for linear model predictive control ***,the motion generation problem can be solved online by quadratic programming with foothold *** is demonstrated that the proposed unified scheme can generate stable locomotion online for quadruped lateral-sequence walk and trot gaits,both in simulation and on *** results show significant performance improvements compared to previous ***,the results also suggest the linearly simplified scheme has the ability to robustness against unexpected disturbances.

关键词： Motion generation Gait pattern conversion Model predictive control Quadruped locomotion

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

Passive attitude stabilization of ionic-wind-powered micro air vehicles

引用

Chinese Journal of Aeronautics 2023年第7期36卷 412-419页

作者： Hengyu ZHANG Jiaming leng Zhiwei LIU Mingjing QI Xiaojun YAN School of Energy and Power Engineering Beihang UniversityBeijing 100191China

The ionic-wind-powered Micro Air Vehicles(MAVs)can achieve a higher thrust-toweight ratio than other ***,this kind of MAV has not yet achieved controlled flight because of the unstable thrust produced by the ionic wind and the dynamic instability related to the small *** this paper,a passive attitude stabilization method of the ionic-wind-powered MAV using air dampers is *** key factors that influence the performance of the air dampers,including the layout,position,and area of the air dampers,are theoretically *** appropriate optimal position of the air dampers is also obtained by Monte Carlo stochastic *** the proposed passive attitude stabilization method is applied to the ionic-wind-powered MAVs of different wingspan(2 cm and 6.3 cm).Finally,the experimental results show that using the proposed method,attitude stabilization is achieved for the first time for the ionic-wind-powered ***,the altitude control of an ionic-wind-powered MAV with a wingspan of 6.3 cm is also demonstrated.

关键词： Air dampers Altitude control Ionic wind propulsion Micro air vehicle Monte Carlo methods Stability

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

Load distribution strategy for multi-lift system with helicopters based on power consumption and robust adaptive game control

引用

Chinese Journal of Aeronautics 2023年第4期36卷 268-285页

作者： Dengyan DUAN Gen leng Jie GAO Xinming FENG Jianbo LI National Key Laboratory of Rotorcraft Aeromechanics Nanjing University of Aeronautics and AstronauticsNanjing 210016China

It is of great significance to reasonably distribute the slung load to each helicopter while considering difference in power consumption,relative position and interaction ***,the load distribution strategy based on power consumption and robust adaptive game control is proposed in this *** study is on a"2-lead"multi-lift system of four tandem heli-copters carrying a load ***,based on the hierarchical control,the load distribution problem is divided into two parts:the calculation of expected cable force and the calculation of the anti-disturbance cable ***,aimed at minimizing the maximum equivalent power of heli-copter,an optimization problem is set up to calculate the expected cable ***,the agent power model is trained by BP neural network,the safe distance constraint between helicopters is set to 2.5 rotor diameters to reduce aerodynamic interference,and the helicopters with different perfor-mance can be considered by introducing the equivalent power factor into the objective ***,considering the difference and interaction between helicopters,the robust adaptive differen-tial game control is proposed to calculate the anti-disturbance cable ***,to solve the coupled Hamiltonian equations,an adaptive solving method for value function is proposed,and its stability is proved in the sense of *** simulation results indicate that the proposed load distribution method based on power consumption is applicable to the entire flight trajectory even there are differences between *** game control can consider interaction between heli-copters,can deal with different objective functions,and has strong robustness and small steady-state *** on the entire strategy,the cable force can be reasonably allocated so as to resist disturbance and improve the flight performance of the whole system.

关键词： Differential game Helicopter Load distribution Multi-lift system Power consumption Tracking control

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

Accurate and straightforward symplectic approach for fracture analysis of fractional viscoelastic media

引用

Applied Mathematics and Mechanics(English Edition) 2022年第3期43卷 403-416页

作者： Chenghui XU Sen leng Zhenhuan ZHOU Xinsheng XU Zichen DENG MIIT Key Laboratory of Dynamics and Control of Complex Systems Department of Engineering MechanicsNorthwestern Polytechnical UniversityXi'an 710072China State Key Laboratory of Structure Analysis of Industrial Equipment Department of Engineering MechanicsDalian University of TechnologyDalian 116024Liaoning ProvinceChina

An accurate and straightforward symplectic method is presented for the fracture analysis of fractional two-dimensional(2D)viscoelastic *** fractional Kelvin-Zener constitutive model is used to describe the time-dependent behavior of viscoelastic *** the framework of symplectic elasticity,the governing equations in the Hamiltonian form for the frequency domain(s-domain)can be directly and rigorously *** the s-domain,the analytical solutions of the displacement and stress fields are constructed by superposing the symplectic eigensolutions without any trial function,and the explicit expressions of the intensity factors and J-integral are derived *** studies are provided to validate the accuracy and effectiveness of the present solutions.A detailed analysis is made to reveal the effects of viscoelastic parameters and applied loads on the intensity factors and J-integral.

关键词： symplectic approach viscoelastic material fractional Kelvin-Zener model crack fracture parameter

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

柴胡疏肝散加减联合三联抗菌药物治疗浆细胞性乳腺炎临床观察

引用

中国中医药现代远程教育 2025年第2期23卷 125-128页

作者：李为包欣学冷琳珲江西省修水县第一人民医院普外科江西九江332400

目的探讨柴胡疏肝散加减联合三联抗菌药物治疗浆细胞性乳腺炎的临床效果。方法选取2020年6月—2022年6月于修水县第一人民医院接受治疗的浆细胞性乳腺炎患者60例为研究对象,以随机数字表法分为对照组、观察组,各30例。对照组予三联抗菌... 详细信息

目的探讨柴胡疏肝散加减联合三联抗菌药物治疗浆细胞性乳腺炎的临床效果。方法选取2020年6月—2022年6月于修水县第一人民医院接受治疗的浆细胞性乳腺炎患者60例为研究对象,以随机数字表法分为对照组、观察组,各30例。对照组予三联抗菌药物(异烟肼、利福平与吡嗪酰胺)治疗,观察组在此基础上予柴胡疏肝散加减治疗,分析两组肿块最大直径、疼痛程度及临床疗效、手术率、不良反应发生率与复发率。结果观察组治疗总有效率为90.00%(27/30),明显高于对照组的66.67%(20/30)(P<0.05)。治疗后,观察组手术率、肿块最大直径、疼痛程度、不良反应发生率以及随访3个月、6个月的复发率均低于对照组(P<0.05)。结论在三联抗菌药物的基础上,联合柴胡疏肝散加减治疗浆细胞性乳腺炎,可显著缩小病灶,改善患者临床症状及疼痛程度,降低复发风险,安全性高,具有临床推广价值。

关键词：粉刺性乳痈浆细胞性乳腺炎柴胡疏肝散利福平异烟肼吡嗪酰胺中西医结合疗法

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

Velocity forecasts using a combined deep learning model in hybrid electric vehicles with V2V and V2I communication

引用

Science China(Technological Sciences) 2020年第1期63卷 55-64页

作者： PEI JiaZheng SU YiXin ZHANG DanHong QI Yue leng ZhiWen School of Automation Wuhan University of TechnologyWuhan 430070China China Ship Development and Design Center Wuhan 430064China

Vehicle velocity forecast is an important clue in improving the performance of energy management in hybrid electric vehicles(HEV). This paper presents a new combined model for predicting vehicle’s velocity time series. The main features of the model are to combine the feature extraction capability of deep restricted Boltzmann machines(DBM) and sequence pattern predicting capability of bidirectional long short-term memory(BLSTM). Hence, the model is named as DBMBLSTM. In addition, the DRMBLSTM model utilizes the vehicle driving information and roadside infrastructure information provided respectively through vehicle-to-vehicle(V2V) and vehicle-to-infrastructure(V2I) communication channels to predict vehicle velocity at various length of prediction horizon. Furthermore, the predictions results of this study are compared with the state of the art of vehicle velocity forecasts. The root mean square error(RMSE) is used as an evaluation criteria of predictions accuracy. Finally,these compared prediction model are applied in model predictive control(MPC) energy management strategy for the verifications of fuel economy improvement of a HEV. Simulation results confirm that the proposed combined deep learning model performs better than other five prediction methods. Therefore, it is a means of arriving at a reliable forecast model for HEV.

关键词： vehicle velocity prediction restricted Boltzmann machines deep belief network long short-term memory,model predictive control

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

Probabilistic robust regression with adaptive weights-a case study on face recognition

引用

Frontiers of Computer Science 2020年第5期14卷 123-134页

作者： Jin Li Quan Chen Jingwen leng Weinan Zhang Minyi Guo Department of Computer Science Shanghai Jiao Tong UniversityShanghai200240China

Robust regression plays an important role in many machine learning problems.A primal approach relies on the use of Huber loss and an iteratively reweightedℓ2 ***,because the Huber loss is not smooth and its corresponding distribution cannot be represented as a Gaussian scale mixture,such an approach is extremely difficult to handle using a probabilistic *** address those limitations,this paper proposes two novel losses and the corresponding probability *** is called Soft Huber,which is well suited for modeling non-Gaussian *** is Nonconvex Huber,which can help produce much sparser results when imposed as a prior on regression *** can represent anyℓq loss(1/2≤q<2)with tuning parameters,which makes the regression model more *** also show that both distributions have an elegant form,which is a Gaussian scale mixture with a generalized inverse Gaussian mixing *** enables us to devise an expectation maximization(EM)algorithm for solving the regression *** can obtain an adaptive weight through EM,which is very useful to remove noise data or irrelevant features in regression *** apply our model to the face recognition problem and show that it not only reduces the impact of noise pixels but also removes more irrelevant face *** experiments demonstrate the promising results on two datasets.

关键词： robust regression nonconvex loss face recognition

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

Measurement system that improves the accuracy of polyp size determined at colonoscopy

引用

World Journal of Gastroenterology 2015年第7期21卷 2178-2182页

作者： Qiang leng Hei-Ying Jin National Center of Colorectal Surgery Jiangsu Integrated Colorectal Oncology Center the Third Affiliated Hospital of Nanjing University of Traditional Chinese Medicine

AIM:To assess the accuracy of polyp size using an endoscopic lesion measurement system(ELMS).METHODS:The accuracy of polyp size assessment was compared among measurements acquired by visual estimation,disposable graduated biopsy forceps(DGBF;used as a"scale-plate")and the ***:There were 192 polyps from 166 cases included in this *** mean diameter of the post polypectomy measurement was 0.85±0.53 cm(range:0.2-3.0 cm).The mean diameter by visual estimation was 1.10±0.53 cm,which was significantly different compared to the actual size of the polyp(P<0.001).The mean diameters obtained using DGBF(0.87±0.54cm)and ELMS(0.85±0.53 cm)did not significantly differ from the actual size of the *** difference between the measurements from the ELMS and DGBF was not ***:Unlike visual estimations at colonoscopy,endoscopic graduated biopsy forceps and the endoscopic lesion measurement system are accurate methods to estimate polyp size.

关键词： Accuracy Colonoscopy Endoscopic lesion measurement

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

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：