检索结果-南通市图书馆

Beyond Performance of Learning Control Subject to Uncertainties and Noise: A Frequency-Domain Approach Applied to Wafer Stages

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 2025年第1期 198-214页

作者： Fazhi Song ning cui Shuaiqi Chen Kai Zhang Yang Liu Xinkai Chen Jiubin Tan IEEE the Center of Ultra-precision Optoelectronic Instrument Engineering Harbin Institute of Technology the Key Laboratory of Ultra-Precision Intelligent Instrumentation Ministry of Industry and Information Technology the State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment Guangdong University of Technology the Center of Ultraprecision Optoelectronic Instrument Engineering Harbin Institute of Technology the Key Laboratory of UltraPrecision Intelligent Instrumentation Ministry of Industry and Information Technology the Department of Electronic and Information Systems Shibaura Institute of Technology

The increasingly stringent performance requirement in integrated circuit manufacturing, characterized by smaller feature sizes and higher productivity, necessitates the wafer stage executing a extreme motion with the accuracy in terms of nanometers. This demanding requirement witnesses a widespread application of iterative learning control(ILC), given the repetitive nature of wafer scanning. ILC enables substantial performance improvement by using past measurement data in combination with the system model knowledge. However, challenges arise in cases where the data is contaminated by the stochastic noise, or when the system model exhibits significant uncertainties, constraining the achievable performance. In response to this issue, an extended state observer(ESO) based adaptive ILC approach is proposed in the frequency *** being model-based, it utilizes only a rough system model and then compensates for the resulting model uncertainties using an ESO, thereby achieving high robustness against uncertainties with minimal modeling effort. Additionally, an adaptive learning law is developed to mitigate the limited performance in the presence of stochastic noise, yielding high convergence accuracy yet without compromising convergence speed. Simulation and experimental comparisons with existing model-based and data-driven inversion-based ILC validate the effectiveness as well as the superiority of the proposed method.

关键词：

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

ICU机械通气患者早期活动训练的研究进展

中国疗养医学 2024年第6期33卷 69-74页

作者：崔卓凝张鹏彭洁耿珍珍刘笑笑杨振高照渝牡丹江医学院护理学院黑龙江牡丹江157011 牡丹江医学院附属红旗医院黑龙江牡丹江157000

机械通气技术是重症监护室(intensive care unit,ICU)患者救治中的常用手段,但长期使用机械通气可能会发生ICU获得性衰弱、呼吸机相关性肺炎、呼吸肌无力、压疮等一系列并发症的概率,延长机械通气时间,增加病死率。因此,早期活动训练对... 详细信息

机械通气技术是重症监护室(intensive care unit,ICU)患者救治中的常用手段,但长期使用机械通气可能会发生ICU获得性衰弱、呼吸机相关性肺炎、呼吸肌无力、压疮等一系列并发症的概率,延长机械通气时间,增加病死率。因此,早期活动训练对于ICU机械通气患者的康复非常重要,同时也是综合治疗中的重要组成部分。早期活动训练可以改善膈肌功能、通气状态,增强肌肉力量,有助于ICU机械通气患者尽早脱机,缩短机械通气时间和住院时间。此外,早期活动训练还可以减少呼吸机相关性肺炎和卧床时间,改善肺部功能,提高生活质量。本文就ICU机械通气患者早期活动训练的必要性、时机、安全性、有效性、方案及效果方面进行综述,为ICU机械通气患者早期活动训练提供参考。

关键词：重症监护病房机械通气早期活动训练研究进展

Heavy metal accumulation characteristics and physiological response of Sabina chinensis and Platycladus orientalis to atmospheric pollution

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2022年第2期34卷 192-201页

作者： ning cui Laiye Qu Gang Wu State Key Laboratory of Urban and Regional Ecology Research Center for Eco-environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China

Heavy metal(Cu,Mn,Zn,Pb,and Cd)concentrations were measured in the leaves of Sabina chinensis and Platycladus orientalis collected from urban,suburban,and rural sites in Tianjin,*** pigment contents,reactive oxygen species content,malondialdehyde(MDA)content and antioxidant enzyme activity were investigated,providing physiological response *** comparison of the sites revealed that urbanization significantly influenced the heavy metal concentrations in both plant *** the rural site,both plant leaves exhibited the lowest heavy metal *** highest Cu,Mn,and Zn concentrations were found in *** leaves from the urban site;the highest Pb and Cd concentrations were found in *** leaves from the urban *** results indicate that the urban site contained larger heavy metal concentrations in the plant leaves that may reflect the anthropogenic emission *** is also found that *** may be used to monitor airborne heavy metal pollution because it is highly quick response to heavy metals,while *** may be used for mitigation due to its high *** results of this study can contribute to the development of monitoring and environmental management plans by providing information on sensitive and resistant tree species for city greening in North China.

关键词： Atmospheric heavy metal pollutions Sabina chinensis Platycladus orientalis Physiological responses

Chronic toxicity and cytotoxicity of synthetic pyrethroid insecticide cis-bifenthrin

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2009年第12期21卷 1710-1715页

作者： WANG cui CHEN Fang ZHANG Quan FANG zhuo College of Biological and Environmental Engineering Zhejiang University of Technology Hangzhou 310032 China College of Environmental Science and Engineering Zhejiang Gongshang University Hangzhou 310035 China

With the increasing use of synthetic pyrethroids （SPs）, the significance of ecological safety and health risk is an emerging concern, In this study, we evaluated the chronic aquatic toxicity of eis-bifenthrin （cis-BF） in Daphnia magna and its cytotoxicity in Chinese hamster ovary （CHO） cells as well as human cervical carcinoma （Hela） ceils. Chronic aquatic toxicity tests showed that cis-BF could significantly affect the reproduction of D. magna. The lowest observed effective concentration and the non-observed effective concentration of cis-BF to D. magna were 0.02 and 0.01 μg/L, respectively, and the chronic value was 0.014 μg/L. The intrinsic rate of natural increase was significantly decreased （p 〈 0.05） to 0.02 μg/L. The cytotoxicity assay demonstrated that cis-BF decreased cell viability in CHO and Hela cells in a concentration- and time-dependent manner. The IC50 values for Hela and CHO cells were 4.0 × 10^-5 and 3.2 × 10^-5 mol/L, respectively. Together, these results indicated that cis-BF induced chronic toxicity in both aquatic invertebrate animals and mammalian cells. These findings assist in understanding the impact of SPs on health and environmental safety. Considering the wide spectrum of SPs, a more comprehensive understanding of the negative effects is indispensible for planning future application and regulation of these pesticides.

关键词： cis-bifenthrin Daphnia magna chronic toxicity cytotoxicity

Feature Recognition and Selection Method of the Equipment State Based on Improved Mahalanobis-Taguchi System

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2020年第2期25卷 214-222页

作者： WANG ning ZHANG zhuo School of Automobile Chang'an UniversityXi'an 710064China School of Mechanical Engineering Northwestern Polytechnical UniversityXi'an 710072China

Mahalanobis-Taguchi system(MTS)is a kind of data mining and pattern recognition method which can identify the attribute characteristics of multidimensional data by constructing Mahalanobis distance(MD)measurement *** this paper,considering the influence of irregular distribution of the sample data and abnormal variation of the normal data on accuracy of MTS,a feature recognition and selection model of the equipment state based on the improved MTS is proposed,and two aspects of the model namely construction of the original Mahalanobis space(MS)and determination of the threshold are ***,the original training sample space is statistically controlled by the X-bar-S control chart,and extreme data of the single characteristic attribute is filtered to reduce the impact of extreme condition on the accuracy of the model,so as to construct a more robust ***,the box plot method is used to determine the threshold of the *** the stability of the model and the tolerance to the extreme condition are improved by leaving sufficient range of the variation for the extreme condition which is identified as in the normal ***,the improved model is compared with the traditional one based on the unimproved MTS by using the data from the *** result shows that compared with the traditional model,the accuracy and sensitivity of the improved model for state identification can be greatly enhanced.

关键词： Mahalanobis-Taguchi system(MTS) extreme condition X-bar-S control chart box plot method Mahalanobis space(MS) Mahalanobis distance(MD) threshold feature recognition equipment state

A prediction method for ground-based stellar occultations by ellipsoidal solar system bodies and its application

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2017年第5期17卷 65-78页

作者： Ye Yuan Yan-ning Fu zhuo Cheng Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210008 China University of Chinese Academy of Sciences Beijing 100049 China

A new programmable prediction method is developed to refine the occultation band by taking into consideration the triaxiality of an occulting body, as well as two more factors, namely, the barycenter offset of an occulting planet from the relevant planetary satellite system and the gravitational deflection of light rays due to an occulting planet. Although these factors can be neglected in most cases, it is shown that there are cases when these factors can cause a variation ranging from several tens to thousands of kilometers in the boundaries of occultation bands. Knowledge of analytic geometry simplifies the process of derivation and computation. This method is applied to long-term predictions of Jovian and Saturnian events.

关键词： shadow stellar Saturn Jupiter uncertainty programmable planet offset derivation refine

A Novel Nano/Micro-Fibrous Scaffold by Melt-Spinning Method for Bone Tissue Engineering

在线全文

学校读者我要写书评

暂无评论

Journal of Bionic Engineering 2015年第1期12卷 117-128页

作者： Liguo cui ning Zhang Weiwei cui Peibiao Zhang Xuesi Chen Key Laboratory of Polymer Ecobiomaterials Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China University of Chinese Academy of Sciences Beijing 100039 China Department of Bone and Joint Surgery First Hospital of Jilin University Changchun 130021 China School of Public Health Jilin University Changchun 130021 China

In order to architecturally and functionally mimic native Extracellular Matrix （ECM）, a novel micro/nano-fibrous scaffold of hydroxyapetite/poly（lactide-co-glycolide）（HA/PLGA） composite was successfully prepared by melt-spinning method. A porous three-dimensional scaffold fabricated by melt-molding particulate-leaching method was used as control. This kind of scaffold comprising both nanofiber and microfiber had an original structure including a nano-network favorable for cell adhe- sion, and a micro-fiber providing a strong skeleton for support. The microfibers and nanofibers were blended homogeneously in scaffold and the compression strength reached to 6.27 MPa, which was close to human trabecular bone. The typical mi- cro/nano-fibrous structure was more benefcial for the proliferation and differentiation of Bone Mesenehymal Stem Cells （BMSCs）. The calcium deposition and Alkaline Phosphatase （ALP） activity were evaluated by the differentiation of BMSCs, and the results indicated that the temporary ECM was very beneficial for the differentiation of BMSCs into maturing osteoblasts. For repairing rabbit radius defects in vivo, micro/nano-fibrous scaffold was used for the purpose of rapid bone remodeling in the defect area. The results showed that a distinct bony callus of bridging was observed at 12 weeks post-surgery and the expression of osteogenesis-related genes （bone-morphogenetic protein-2, Osteonectin, collagen-I） increased because of the ECM-like structure. Based on the results, the novel micro/nano-fibrous scaffold might be a promising candidate for bone tissue engi- neering.

关键词： PLGA-based scaffold melt-spinning nano/micro-fibers bone tissue engineering

AlN precipitation during steel solidification using CA model

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2022年第11期29卷 1789-1799页

作者： Lei cui Yi-han Shi Xiang-ning Meng Key Laboratory for Ecological Metallurgy of Multi-Metallic Ores Northeastern UniversityShenyang 110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina

Based on the principles of metal solidification and cellular automaton(CA),as well as AlN precipitation thermodynamics and kinetics,a CA model of interdendritic AlN precipitation was established by coupling a large-size mesh describing the dendrite growth of Fe-C-Al-N alloys and a small-size mesh representing AlN precipitation based on transient chemical *** results of single dendrite growth stimulated by this model were compared with the Lipton-Glicksman-Kurz solution to verify the correctness of the matrix dendrite growth *** AlN morphology and dimensions obtained from the CA model simulations are following the experimental *** presence of equiaxed dendrite in the computational domain results in a significant coarsening of the columnar dendrite and a uniform solute distribution around them,and the AlN solid phase fraction *** of AlN precipitation at different wetting angles were also performed,and it was found that the solid phase fraction of AlN decreased with the increase in wetting ***,it is confirmed that the established model is an effective method to simulate interdendritic AlN precipitation.

关键词： Metal solidification Cellular automaton Wetting angle AlN precipitation Dendrite growth

Optimal Technology Investment under Emission Trading Policy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2020年第2期29卷 143-162页

作者： Shuo Huang Zhong Wen Jian Chen ning cui School of Economics and Management Tsinghua UniversityBeijing 100084China Beijing Foreign Studies University China Southern Asset Management Co. Ltd.

Low-carbon economy is gaining growing attention nowadays as global warming *** a market-based policy,emission trading policy is widely considered an effective means to achieve the doublewin of economic development and environmental *** such circumstances,carbon trading markets are developing rapidly in many countries and regions,demanding more attention to compliance strategy issues for emission-intensive *** this study,we build a dynamic programming model in search of the optimal emission trading and technology investment decisions for a make-to-order company faced with a stochastic demand under emission trading *** a comprehensive analysis of the proposed model,we find that an optimal emission permit level,which increases in carbon penalty and decreases in carbon price,exists in each *** for the abatement technology investment decision,the firm should invest only ff the investment cost per unit of abatement effort is less than a certain threshold,which increases in carbon penalty and carbon *** the basis of a two-period dynamic programming model,we further explore the problem of investment *** show how optimal investment decisions are influenced by the speed of technology progress under different *** findings are important for firms to choose the time of investment depending on specific situations.

关键词： Low-carbon emission trading compliance strategy investment-timing