检索结果-南通市图书馆

Non-fragile guaranteed cost control for uncertain neutral large-scale interconnected systems

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2010年第4期21卷 635-642页

作者： Dan Zhao Qingling Zhang Heli hu Chunyuan Zhao Department of Fundamental Teaching Shenyang Institute of Engineering Shenyang 110136 P. R. China Institute of Systems Science Northeastern University Shenyang 110004 P. R. China Key Laboratory of Manufacturing Industrial Integrated Automation Shenyang University Shenyang 110044 P. R. China

This paper focuses on the problem of non-fragile decentralized guaranteed cost control for uncertain neutral large-scale interconnected systems with time-varying delays in state,control input and interconnections.A novel scheme,viewing the interconnections with time-varying delays as effective information but not disturbances,is *** on Lyapunov stability theory,using various techniques of decomposing and magnifying matrices,a design method of the non-fragile decentralized guaranteed cost controller for unperturbed neutral large-scale interconnected systems is proposed and the guaranteed cost is *** further results are derived for the uncertain case from the criterion of unperturbed neutral large-scale interconnected ***,an illustrative example shows that the results are significantly better than the existing results in the literatures.

关键词： neutral large-scale interconnected systems nonfragile decentralized guaranteed cost control time-varying delay linear matrix inequality(LMI).

A 14.5Gb/s word alignment circuit in 0.18μm CMOS technology for high-speed SerDes

在线全文

学校读者我要写书评

暂无评论

High Technology Letters 2014年第3期20卷 328-332页

作者：阮伟华 hu Qingsheng Institute of RF-&OE-lCs Southeast University

This paper presents a word alignment circuit for high speed SerDes *** using pipeline structure and circuit optimization techniques,the speed of the aligner is increased,and its performance is improved further through adopting the full custom design *** proposed word aligner has fabricated in 0.18μm CMOS technology with total area of 1.075 ×0.775mm^2￣ including I/O *** results show that this circuit achieves the maximum data rate of 14.5Gb/s,while consuming a total power of 34.9mW from a 1.8V supply.

关键词： comma detection word alignment pipeline full custom parallel structure

Effects of silicon on mechanical properties of AM60 magnesium alloy

在线全文

学校读者我要写书评

暂无评论

China Foundry 2012年第3期9卷 244-247页

作者： hu Yong Rao Li Key Laboratory of Ministry for Education for Conveyance and Equipment East China Jiaotong UniversityNanchang 330013China

Silicon was added to improve the tensile, wear and creep behaviors of AM60 magnesium alloy in this study. The investigation has been undertaken by means of universal testing machine, HBE-3000A Brinell hardness tester, M-2000 friction-wear machine, DMA-Q800 creep machine, optical microscopy (OM) and scanning electron microscopy (SEM). The results indicate that the Chinese script type Mg2Si particles are formed by adding Si into the AM60 magnesium alloy. The ultimate tensile strength and hardness of the AM60 magnesium alloy increases with the Si addition, and the ultimate tensile strength and hardness of the AM60+1.0wt.%Si alloy are increased by 12% and 19.8%, respectively in comparison with that of the AM60 magnesium alloy. The wear property and the high temperature creep property of the AM60 magnesium alloy are also improved with Si addition. The wear mechanisms of the AM60 and AM60+1.0wt.%Si alloys are adhesive wear and abrasion wear, respectively. While, the elongation of the AM60 magnesium alloy decreases with the addition of Si. The optimum Si addition content is 1.0wt.%.

关键词： magnesium alloy tensile wear creep property

Image Based Rendering under Varying Illumination

在线全文

学校读者我要写书评

暂无评论

High Technology Letters 2003年第3期9卷 6-10页

作者：王城峰 hu Zhanyi National Laboratory of Pattern Recognition Institute of Automation Chinese Academy of SciencesBeijing 100080P.R.China

A new approach for photorealistic rendering of a class of objects at arbitrary illumination is presented. The approach of the authors relies entirely on image based rendering techniques. A scheme is utilized for re-illumination of objects based on linear combination of low dimensional image representations. The minimum rendering condition of technique of the authors is three sample images under varying illumination of a reference object and a single input image of an interested object. Important properties of this approach are its simplicity, robustness and speediness. Experimental results validate the proposed rendering approach.

关键词： image based rendering illumination faces

Recyclable Polypropylene-based Insulation Materials for HVDC Cables:Progress and Perspective

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2024年第5期10卷 2208-2220页

作者： Yao Zhou Shixun hu Chao Yuan Jun hu Qi Li jinliang He State Key Laboratory of Power Systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China Beijing Key Lab of High Voltage&EMC and State Key Lab of Alternate Electrical Power System with Renewable Energy SourcesNorth China Electric Power UniversityBeijing 102206China.

Polypropylene(PP)-based recyclable materials have attracted tremendous interest for HVDC cable insulation applications due to their superior electrical properties,e.g.,high thermal stability and superior *** with crosslinked polyethylene(XLPE),PP-based materials exhibit the advantages of not only higher working temperatures but also facile and efficient cable manufacturing with reduced costs,which are highly desirable in HVDC cable *** their promising advantages,PP-based materials have received significant attention from both academia and industry in the field of HVDC cable *** order to adopt PP as a cable insulation material,the mechanical flexibility of PP should be ***,regulations of the mechanical properties inevitably influences the electrical properties of *** extensive research has been conducted on the regulation of the mechanical and electrical properties of *** review summarizes the research progress on recyclable PP-based materials for HVDC cable insulation *** attention is placed on the electrical property regulations and material structure-property *** challenges that remain to be addressed and the opportunities for future studies on PP-based recyclable HVDC cable insulation materials are also presented.

关键词： polypropylene HVDC cable dielectric materials recyclable insulation materials

An experimental study of tin partition between melt and aqueous fluid in F/Cl-coexisting magma

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

Chinese Science Bulletin 2009年第6期54卷 1087-1097页

作者： hu XiaoYan BI XianWu SHANG LinBo hu RuiZhong CAI GuoSheng CHEN YouWei State Key Laboratory of Ore Deposit Geochemistry Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 China Guizhou Bureau of Nonferrous Metal Geological Exploration Guiyang 550002 China Graduate University of the Chinese Academy of Sciences Beijing 100049 China

为了调查听矿石的形成机制，与忍受 F 花岗石联系了，在忍受 F 之间的听分区的试验性的研究花岗石融化，共存的忍受 HCl 水的液体与接近 NNO 的 fo 2 在 850 ° C 和 100MPa 被进行。锡的 Geochemical 行为被变化在以不同氧化铝浸透索引... 详细信息

为了调查听矿石的形成机制，与忍受 F 花岗石联系了，在忍受 F 之间的听分区的试验性的研究花岗石融化，共存的忍受 HCl 水的液体与接近 NNO 的 fo 2 在 850 ° C 和 100MPa 被进行。锡的 Geochemical 行为被变化在以不同氧化铝浸透索引 ASI 开始稳固的材料跟踪，在 F 内容并且在开始各种各样的 HCl 集中的液体。结果显示出那 D 有 ASI 的 Sn 增加融化并且每铝土融化为进在 F/Cl-coexisting 系统的水的液体的听分区是有利的。更高的 HCl 集中的水的液体为锡的丰富是有益的。而且，在玻璃跑产品的氯内容在岩浆与 F 和 Cl 内容断然相关。在 F/Cl-coexisting 系统，花岗石在能为听矿石的形成用作一座水库的 melt 与内容(>∼1 wt%) 能提取并且充实的高 F 融化锡。然而，当在 melt 的 F 内容在 1 wt% 下面时，锡的分配系数将显著地增加。因此， F 内容的减少对进有高 HCl 内容的水的液体的锡的分区有利，因此支持热水的听矿石的免职。

关键词：共存系统孔子分区实验岩浆水人机交互融化

Robust blind image watermarking based on interest points

在线全文

学校读者我要写书评

暂无评论

虚拟现实与智能硬件（中英文） 2024年第4期6卷 308-322页

作者： Zizhuo WANG Kun hu Chaoyangfan huANG Zixuan hu Shuo YANG Xingjun WANG Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518071China

Digital watermarking technology plays an essential role in the work of anti-counterfeiting and ***,image watermarking algorithms are weak against hybrid attacks,especially geometric attacks,such as cropping attacks,rotation attacks,*** propose a robust blind image watermarking algorithm that combines stable interest points and deep learning networks to improve the robustness of the watermarking algorithm ***,to extract more sparse and stable interest points,we use the Superpoint algorithm for generation and design two steps to perform the screening *** first keep the points with the highest possibility in a given region to ensure the sparsity of the points and then filter the robust interest points by hybrid attacks to ensure high *** message is embedded in sub-blocks centered on stable interest points using a deep learning-based *** kinds of attacks and simulated noise are added to the adversarial training to guarantee the robustness of embedded *** use the ConvNext network for watermark extraction and determine the division threshold based on the decoded values of the unembedded *** extensive experimental results,we demonstrate that our proposed algorithm can improve the accuracy of the network in extracting information while ensuring high invisibility between the embedded image and the original cover *** with previous SOTA work reveals that our algorithm can achieve better visual and numerical results on hybrid and geometric attacks.

关键词： Blind watermarking Robust region selection Geometric distortion Deep learning

Effect of solution cooling rate on the γ′ precipitation behaviors of a Ni-base P/M superalloy

在线全文

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2008年第6期15卷 729-734页

作者： Gaofeng Tian Chengchang Jia Ying Wen Benfu hu School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

The effect of cooling rate on the cooling γ′ precipitation behaviors was investigated in a Ni-base powder/metallurgy （P/M） superalloy （FGH4096）. The empirical equations were established between the cooling rate and the average sizes of secondary and tertiary γ′ precipitates within grains and tertiary γ′ precipitates at grain boundaries, as well as the apparent width of grain boundaries. The results show that the average sizes of secondary or tertiary γ′ precipitates are inversely correlated with the cooling rate. The shape of secondary γ′ precipitates within grains changes from butterfly-like to spherical with the increase of cooling rate, but all the tertiaryγ′ precipitates formed are spherical in shape. It is also found that tertiary γ′ may be precipitated in the latter part of the cooling cycle only if the cooling rate is not faster than 4.3℃/s, and the apparent width of grain boundaries decreases linearly with the increase of cooling rate.

关键词： powder metallurgy Ni-base superalloy precipitates cooling rate

Wave localization in randomly disordered periodic layered piezoelectric structures

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2006年第6期22卷 559-567页

作者： Fengming Li Yuesheng Wang Chao hu Wenhu huang Department of Aerospace Science and Mechanics Harbin Institute of Technology Harbin 150001 China Institute of Engineering Mechanics Beijing Jiaotong University Beijing 100044 China School of Aerospace Engineering and Mechanics TongJi University Shanghai 200092 China Department of Aerospace Engineering and Mechanics Harbin Institute of Technology Harbin 150001 China

Considering the mechnoelectrical coupling, the localization of SH-waves in disordered periodic layered piezoelectric structures is studied. The waves propagating in directions normal and tangential to the layers are considered. The transfer matrices between two consecutive unit cells are obtained according to the continuity conditions. The expressions of localization factor and localization length in the disordered periodic structures are presented. For the disordered periodic piezoelectric structures, the numerical results of localization factor and localization length are presented and discussed. It can be seen from the results that the frequency passbands and stopbands appear for the ordered periodic structures and the wave localization phenomenon occurs in the disordered periodic ones, and the larger the coefficient of variation is, the greater the degree of wave localization is. The widths of stopbands in the ordered periodic structures are very narrow when the properties of the consecutive piezoelectric materials are similar and the intervals of stopbands become broader when a certain material parameter has large changes. For the wave propagating in the direction normal to the layers the localization length has less dependence on the frequency, but for the wave propagating in the direction tangential to the layers the localization length is strongly dependent on the frequency.

关键词： Disordered periodic layered piezoelectric structures Transfer matrix Lyapunov exponent Localization factor Localization length