检索结果-南通市图书馆

Two new upper bounds of the solution for the continuous algebraic Riccati equation and their application

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2015年第5期58卷 156-167页

作者： xia yaping CAI Chenxiao YIN MingHui ZOU Yun School of Automation Nanjing University of Science and Technology

In this paper, for the solution of the continuous algebraic Riccati equation(CARE), we derived two new upper matrix bounds. Compared with the existing results, the newly obtained bounds are less conservative and more practical, which means that the condition for the existence of the upper bounds derived here is much weaker. The advantage of the results is shown by theoretical analysis and numerical examples. Moreover, in redundant optimal control, when we increase the columns of the input matrix, some sufficient conditions are presented to strictly decrease the largest singular value of the feedback matrix by utilizing these upper *** also give some examples to illustrate the effectiveness of these sufficient conditions.

关键词： upper matrix bound continuous algebraic Riccati equation optimal control redundant control largest singular value

Enhancing the long-term Na-storage cyclability of conversion-type iron selenide composite by construction of 3D inherited hyperbranched polymer buffering matrix

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2021年第11期14卷 3952-3960页

作者： Hao Li Changchun Hu yaping xia Ting Li Daohong Zhang Fei Xu Key Laboratory of Catalysis and Energy Materials Chemistry of Ministry of Education&Hubei Key Laboratory of Catalysis and Materials Science Hubei R&D Center of Hyperbranched Polymers Synthesis and ApplicationsSchool of Chemistry and Materials ScienceSouth-Central University for NationalitiesWuhan430074China Key Laboratory of Hydraulic Machinery Transients Ministry of EducationSchool of Power and Mechanical EngineeringWuhan UniversityWuhan430072China

Electrochemical conversion reactions provide more selections for Na-storage materials, but the reaction suffers from low reversibility and poor cyclability. Introducing an electrochemically inactive component is a common strategy, but the effect is quite limited since it could not stabilize the structure during long-term cycling. In this study, a new approach is developed using an amino group-functioned hyperbranched polymer (AHP) as a template and electrode additive for the design of high-performance FeSe2-AHP composite with chemical interaction. The assembled FeSe2-AHP composite nanoneedles were prepared by the selenylation of FeS-AHP composite microflowers and entirely inherit the polymer network from the precursor. The amino groups of AHP in composite coordinate with iron cations to achieve uniform polymer dispersion in the composite, and maintain the molecular level mixed state during the long-term cycling. Moreover, the in-situ constructed uniform 3D elastic polymer network effectively accommodates volume expansion and alleviates nanoparticle aggregation during sodiation/de-sodiation. FeSe2-AHP composite provides a superior rate capability (584.8 mAh·g−1 at 20 A·g−1) and a remarkable cyclability with a capacity retention rate of 93.3% after 2,000 cycles. FeSe2-AHP composite shows a high pseudocapacitive behavior for the abundant nanometer interface established by AHP, enhancing the solid-state Na+ diffusion. The FeSe2-AHP anode is also compatible with Na3V2(PO4)3/C cathode in a full Na-ion battery, which provides a high-power performance (powering 51 LEDs). The work herein highlights an innovative and efficient strategy for conversion-type material design and demonstrates the function of chemical interaction of polymer additive in the enhancement of long-term cyclability for conversion electrode.

关键词： Na-ion batteries conversion materials hyperbranched polymer iron selenide chemical interaction

Variable Parameter Nonlinear Control for Maximum Power Point Tracking Considering Mitigation of Drive-train Load

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

IEEE/CAA Journal of Automatica Sinica 2017年第2期4卷 252-259页

作者： Zaiyu Chen Minghui Yin Lianjun Zhou yaping xia Jiankun Liu Yun Zou School of Automation Nanjing University of Science and Technology IEEE Department of Power Network Jiangsu Electric Power Company Research Institute

Since mechanical loads exert a significant influence on the life span of wind turbines, the reduction of transient load on drive-train shaft has received more attention when implementing a maximum power point tracking U+0028 MPPT U+0029 controller. Moreover, a trade-off between the efficiency of wind energy extraction and the load level of drive-train shaft becomes a key issue. However, for the existing control strategies based on nonlinear model of wind turbines, the MPPT efficiencies are improved at the cost of the intensive fluctuation of generator torque and significant increase of transient load on drive train shaft. Hence, in this paper, a nonlinear controller with variable parameter is proposed for improving MPPT efficiency and mitigating transient load on drive-train simultaneously. Then, simulations on FAST U+0028 Fatigue, Aerodynamics, Structures, and Turbulence U+0029 code and experiments on the wind turbine simulator U+0028 WTS U+0029 based test bench are presented to verify the efficiency improvement of the proposed control strategy with less cost of drive-train load. © 2017 Chinese Association of Automation.

关键词： Aerodynamics Controllers Economic and social effects Maximum power point trackers Wind power Wind turbines

在线全文

学校读者我要写书评

暂无评论

从朱熹的诠释思想展望中国现代诠释学

中国文化研究 2015年第2期 80-91页

作者：李清良夏亚平湖南大学岳麓书院

朱熹的诠释思想是整个中国经典诠释传统中的理论高峰和典型代表,对于我们探讨中国现代诠释学的建立和发展极有启发。综合考察朱熹的诠释思想,可以说它实质上是一种古典的"仁学诠释学",即以儒家仁学为基本原则对诠释活动加以全面系统的... 详细信息

朱熹的诠释思想是整个中国经典诠释传统中的理论高峰和典型代表,对于我们探讨中国现代诠释学的建立和发展极有启发。综合考察朱熹的诠释思想,可以说它实质上是一种古典的"仁学诠释学",即以儒家仁学为基本原则对诠释活动加以全面系统的反思、解释和规定,从而将诠释之道从本质上视为在意义世界中修身成己、安人成物的仁道,并将诠释活动从根本上视为在意义世界中践行仁道而修己安人的工夫。进一步看,作为中国经典诠释传统之主流与大宗的儒家诠释传统,其理论思考其实也可以说是古典"仁学诠释学"。中国现代诠释学乃是中华文明基于其诠释传统而自觉建立的现代诠释之道,其主要发展方向应是力求将古典"仁学诠释学"转化为现代"仁学诠释学"。

关键词：中国现代诠释学朱熹仁学诠释学诠释之道

怎样的受控对象更好控制——一个基于能控度的分析与猜想

在线全文

学校读者我要写书评

暂无评论

中国科学：信息科学 2017年第1期47卷 47-57页

作者：邹云夏亚平殷明慧蔡晨晓南京理工大学自动化学院南京210014

本文从控制系统一体化设计的思想以及熟知的社会现象中分析提取出这样一个控制命题:怎样的受控对象更好控制?具体则从"这类对象如果存在,那么应当满足怎样的特性?"这一关键环节切入,以线性/线性化模型描述的受控对象为平台,给出了"更好... 详细信息

本文从控制系统一体化设计的思想以及熟知的社会现象中分析提取出这样一个控制命题:怎样的受控对象更好控制?具体则从"这类对象如果存在,那么应当满足怎样的特性?"这一关键环节切入,以线性/线性化模型描述的受控对象为平台,给出了"更好控制"的概念:控制效果更好、控制增益更低;进一步分析了该控制问题的特点及所需的理论基础,提出了能控度控制学猜想:相同条件下,能控度高的系统会更好控制.最后,给出了解决该猜想的初步理论框架并简要地介绍了相关的进展.

关键词：控制论控制理论受控对象能控度对象参数优化

新型查尔酮衍生物的合成及抗肿瘤活性评价（英文）

在线全文

学校读者我要写书评

暂无评论

有机化学 2019年第3期39卷 703-708页

作者：盛琦威赵婉秋曾明谢中袍夏雅平崔冬梅浙江工业大学药学院

主要通过 Claisen-Schmidt 缩合反应设计合成了一系列含有哌啶、吗啡啉、N-甲基哌嗪取代的查尔酮衍生物,并通过噻唑蓝(MTT)法对 MCF-7(人乳腺癌细胞系)、A549(人肺癌细胞系)、HL-60(人白血病细胞系)、Hela(人宫颈癌细胞系)和 Bewo(人绒... 详细信息

主要通过 Claisen-Schmidt 缩合反应设计合成了一系列含有哌啶、吗啡啉、N-甲基哌嗪取代的查尔酮衍生物,并通过噻唑蓝(MTT)法对 MCF-7(人乳腺癌细胞系)、A549(人肺癌细胞系)、HL-60(人白血病细胞系)、Hela(人宫颈癌细胞系)和 Bewo(人绒毛肿瘤细胞系)等五种癌细胞系进行了体外抗癌活性研究.研究表明,化合物 4a, 4e, 4f, 4j, 4m, 4o 对MCF-7, A549, HL-60 三种癌细胞系抗癌活性最佳, IC50 值均在 10 μmol/L 以下.

关键词：查尔酮缩合抗癌 MTT 法

“护患关系协调与纠纷处理”课程情境案例教学实践

在线全文

学校读者我要写书评

暂无评论

中国护理管理 2016年第10期16卷 1306-1309页

作者：薄雅萍夏素华首都医科大学附属北京世纪坛医院护理部 100038 北京大学医学网络教育学院教学部

"护患关系协调与纠纷处理"课程是基于典型工作任务的护理专业专升本远程教学改革体系中的一门课程,经实践专家研讨确定了符合护士能力发展规律的从简单到复杂的4个学习情境。采用情境案例教学法,在教师指导下学生自主选择符合情境要求... 详细信息

"护患关系协调与纠纷处理"课程是基于典型工作任务的护理专业专升本远程教学改革体系中的一门课程,经实践专家研讨确定了符合护士能力发展规律的从简单到复杂的4个学习情境。采用情境案例教学法,在教师指导下学生自主选择符合情境要求的临床案例进行分析讨论,完成学习任务。对2013-2015级115名学生的教学实践显示:74.50%以上的学生能自主选择到符合教学要求的案例;86.62%的学生能达到教学目标的要求;学生运用理论知识分析情境案例,反思并解决其中的问题,完成学习任务的成绩总体呈上升趋势,将理论运用于实践、指导实践的能力明显提高;学生完成学习任务后,临床工作能力有很大提高。

关键词：护患关系情境教学案例教学教学方法教学改革