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Matching mechanism for networked control systems with multirate sampling

IET CONTROL THEORY AND APPLICATIONS 2017年第16期11卷 2848-2857页

作者： Jia, Xin-Chun Ma, Weiwei Yang, fuwen zhang, Dawei Shanxi Univ Sch Math Sci Taiyuan 030006 Shanxi Peoples R China Griffith Univ Griffith Sch Engn Southport Qld 4222 Australia

This study deals with the observer-based controller design problem for a class of networked control systems with multirate sampling. A matching mechanism is proposed to synchronise the sampled data between the plant and an observer, and computes the corresponding error. Using the error, the multirate observer is developed to estimate the state of the system in real time. A state feedback controller based on the observer is utilised to control the system. Different from discrete-time modelling methods, the resulting closed-loop system is modelled as a continuous-time system with multiple sawtooth input-delays. Inspired by Wirtinger's inequality, a new Lyapunov-Krasovskii functional is constructed to analyse efficiently the closed-loop system in the presence of time-varying network-induced delays. Then sufficient conditions for H-infinity performance analysis and the observer-based controller design are presented. Finally, two illustrative examples show the effectiveness of the proposed method.

关键词： networked control systems observers control system synthesis state feedback closed loop systems Lyapunov methods time-varying systems multivariable control systems matching mechanism networked control systems multirate sampling observer based controller design problem sampled data multirate observer state feedback controller discrete-time modelling methods closed-loop system continuous-time system multiple sawtooth input-delays Lyapunov-Krasovskii functional time-varying network-induced delays

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MoS2/GO-g-C3N4-ZnO三元复合纳米材料的制备及可见光光催化性能研究

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功能材料 2019年第9期50卷 9006-9012页

作者：王宁马春雨胡金娟王佳琳秦福文张庆瑜大连理工大学物理学院三束材料改性教育部重点实验室

通过水热法制备出基于20%(质量分数)g-C3N4-ZnO的高效的三元复合材料0.2%(质量分数)MoS2-g-C3N4-ZnO(MCZ)和15%(质量分数)GO-g-C3N4-ZnO(GCZ)。采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)、X射线光电子能谱(XPS)、光致荧光光谱(PL)、紫外-可见吸收光谱(UV-Vis)、瞬态光电流响应对样品进行表征,研究了MoS2或GO的引入对ZnO晶体结构、形貌、成分和光催化活性的影响。结果表明,MCZ和GCZ均保持ZnO的六方纤锌矿结构,且g-C3N4为类石墨相。GO的引入可以抑制ZnO晶粒的生长,而MoS2的引入可以促进ZnO晶粒的生长。GCZ复合材料中存在明显的电子转移现象,抑制20%(质量分数)g-C3N4-ZnO中光生电子空穴对的复合,提高其可见光催化性能。GCZ复合光催化剂的光催化活性明显优于20%(质量分数)g-C3N4-ZnO和MCZ。

关键词： g-C3N4-ZnO MoS2 GO 三元复合材料水热法可见光催化

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玉米高赖氨酸和糯性基因聚合材料品质性状的配合力分析

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种子 2020年第6期39卷 9-13页

作者：余彩霞杨文鹏王明春柏光晓任洪张开武柯付文王伟贵州大学农学院贵阳550025 贵州省农业科学院旱粮研究所贵阳550006

为了解玉米高赖氨酸和糯性基因聚合材料品质性状的配合力效应,以优质基因聚合系及其亲本和常用玉米骨干自交系为材料,按9×15不完全双列杂交设计,进行品质性状的配合力研究。结果表明:5个品质性状的GCA和SCA均存在显著差异;各性状的... 详细信息

为了解玉米高赖氨酸和糯性基因聚合材料品质性状的配合力效应,以优质基因聚合系及其亲本和常用玉米骨干自交系为材料,按9×15不完全双列杂交设计,进行品质性状的配合力研究。结果表明:5个品质性状的GCA和SCA均存在显著差异;各性状的GCA方差均大于SCA方差,GCA方差占基因型方差比例的大小顺序是含油量>淀粉>蛋白质>谷氨酸>赖氨酸;综合品质性状表现,三基因聚合材料QCL 8002-11(o2o16wx)和QCL 8006-2(o2o16wx)分别在增加赖氨酸含量和含油量方面有比较好的利用潜力,两基因聚合材料QCL 8009-5(o16wx)对增加谷氨酸和蛋白质含量、QCL 8003-2(o2o16)和QCL 8001-10(o2o16)对增加总淀粉含量有较好的利用潜力。

关键词：玉米基因聚合材料品质性状配合力

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Robust fuzzy-model-based filtering for nonlinear networked systems with energy constraints

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JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS 2017年第4期354卷 1957-1973页

作者： zhang, Dan Yang, fuwen Yu, Chao Srinivasan, Dipti Yu, Li Zhejiang Univ Technol Dept Automat Hangzhou 310023 Zhejiang Peoples R China Natl Univ Singapore Dept Elect & Comp Engn Singapore 117576 Singapore Griffith Univ Griffith Sch Engn Gold Coast Qld 4222 Australia

The fuzzy-model-based H infinity filtering for a class of discrete-time wireless nonlinear networked systems with energy constraints is investigated in this paper. Due to the limitation of transmission power, the measurement data is not transmitted at each sampling instant, and it is scheduled here. Two techniques are proposed to reduce the transmission power, i.e., event-based transmission protocol and measurement size reduction scheme. Firstly, a new event-based transmission protocol is presented such that the transmission occurs only when the designed event occurs. Then, the measurement size reduction technique is applied. The so-called measurement size reduction technique consists of two parts: the logarithmic quantization and the stochastic measurement element selection. The simultaneous utilization of above two techniques can significantly reduce the energy consumption in such a wireless networked system. By constructing the fuzzy-mode-dependent Lyapunov functional, sufficient conditions are derived such that the filtering error system is stochastically stable with a prescribed Hm performance level. An optimization problem is presented to determine the optimal filter gains. The effectiveness of the proposed filter design scheme is illustrated by a simulation study on the nonlinear truck-trailer system. (C) 2017 The Franklin Institute. Published by Elsevier Ltd. All rights reserved.

关键词： ENERGY consumption DISCRETE-time systems NONLINEAR network analysis LYAPUNOV functions FUZZY control systems

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Invasive micropapillary carcinoma of the breast has a better long-term survival than invasive ductal carcinoma of the breast in spite of its aggressive clinical presentations: a comparison based on large population database and case-control analysis

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CANCER MEDICINE 2017年第12期6卷 2775-2786页

作者： Chen, Hongliang Wu, Kejin Wang, Maoli Wang, fuwen zhang, Mingdi zhang, Peng Fudan Univ Dept Breast Surg Obstet & Gynecol Hosp Shanghai 200011 Peoples R China

There are controversies in the comparison of overall survival between invasive micropapillary carcinoma of the breast (IMPC) and invasive ductal carcinoma (IDC). The objective of this study was to compare the long-term survival outcome between non-metastatic IMPC and IDC. The Surveillance, Epidemiology, and End Results database was searched to identify women with non-metastatic IMPC and IDC diagnosed between 2001 and 2013. Comparisons of patient and tumor characteristics were performed using Pearson's chi-square. The propensity score matching method was applied with each IMPC matched to one IDC. Breast cancer-specific survival (BCSS) and overall survival (OS) were estimated using the Kaplan-Meier product limit method and compared across groups using the log-rank statistic. Multivariate analysis was performed through Cox models. IMPC was presented with aggressive clinical presentations such as larger tumor, more positive lymph nodes, and more advanced stage compared with IDC. A higher rate of estrogen receptor (ER)/progesterone receptor (PR) positivity was also observed in IMPC. With a median follow-up of 64months, IMPC had a better BCSS (P=0.031) and OS (P=0.012) compared with IDC. In a case-control analysis IMPC was still an independent favorable prognostic factor for BCSS (HR=0.410, P<0.001, 95% CI: 0.293-0.572) and OS (HR=0.497, P<0.001, 95% CI: 0.387-0.637). In subgroup analysis, IMPC always showed a better survival outcome compared with IDC except in AJCC stage I and histologic grade I disease. IMPC has a better long-term survival outcome compared with IDC in spite of its highly aggressive clinical presentation.

关键词： Breast cancer-specific survival case-control analysis invasive ductal carcinoma invasive micropapillary carcinoma of the breast overall survival

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A standard mastectomy should not be the only recommended breast surgical treatment for non-metastatic inflammatory breast cancer: A large population-based study in the Surveillance, Epidemiology, and End Results database 18

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BREAST 2017年 35卷 48-54页

作者： Chen, Hongliang Wu, Kejin Wang, Maoli Wang, fuwen zhang, Mingdi zhang, Peng Fudan Univ Dept Breast Surg Obstet & Gynecol Hosp 419 Fangxie Rd Shanghai 200011 Peoples R China

Background: Standard mastectomy has long been the recommended breast surgical treatment for non-metastatic inflammatory breast cancer (IBC). The objective of this population-based study was to evaluate the significance of various breast surgical treatments for this highly aggressive subtype. Methods: The Surveillance, Epidemiology, and End Results program registry was searched to identify women with non-metastatic IBC receiving standard treatment including breast surgery, radiation therapy and chemotherapy diagnosed between 1998 and 2013. Comparisons of the proportions of various breast surgery procedures over the years were performed using Pearson's chi-square test. Breast cancer-specific survival (BCSS) and overall survival (OS) were estimated using the Kaplan-Meier product limit method and compared across groups using the log-rank statistic. Cox models were then fitted to compare the association between various breast surgical procedures and BCSS or OS after adjusting for patient and tumor characteristics. Results: A total of 3374 cases were identified. Over the years, the proportion of contralateral prophylactic mastectomy (CPM), breast reconstruction and both were increasing. The proportion of implant-based reconstruction was also increasing with no difference in survival compared with other types of reconstruction. There was no statistically significant difference in BCSS or OS among various breast surgery treatments, such as breast conserving surgery, CPM, breast reconstruction and standard unilateral mastectomy. Conclusions: Breast surgery is of great significance to the clinical outcome of IBC. Standard mastectomy should not be the only recommended breast surgical treatment. (C) 2017 Elsevier Ltd. All rights reserved.

关键词： Inflammatory breast cancer Mastectomy Breast conserving surgery Contralateral prophylactic mastectomy Breast reconstruction Breast cancer-specific survival Overall survival

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碳纤维布与木材界面黏结性能试验研究及数值分析

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工业建筑 2016年第5期46卷 55-60页

作者：李向民张富文许清风陈建飞上海市建筑科学研究院上海市工程结构安全重点实验室上海200032 贝尔法斯特女皇大学规划建筑及土木工程学院

通过碳纤维布与木材黏结界面的单剪试验,给出了碳纤维布应变发展及分布规律,讨论了黏结长度、黏结宽度和碳纤维布厚度等试验参数对黏结性能的影响,构建了相应的黏结滑移本构模型,并引入黏结宽度比系数给出了单层碳纤维布与木材顺纹界面... 详细信息

通过碳纤维布与木材黏结界面的单剪试验,给出了碳纤维布应变发展及分布规律,讨论了黏结长度、黏结宽度和碳纤维布厚度等试验参数对黏结性能的影响,构建了相应的黏结滑移本构模型,并引入黏结宽度比系数给出了单层碳纤维布与木材顺纹界面黏结应力峰值的计算公式。基于单剪试验的非线性有限元分析结果具有一定的精度。

关键词：碳纤维布木材黏结性能黏结滑移本构模型有限元分析

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Reintroduction of the giant panda into the wild: A good start suggests a bright future

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BIOLOGICAL CONSERVATION 2018年 217卷 181-186页

作者： Yang, Zhisong Gu, Xiaodong Nie, Yonggang Huang, Feng Huang, Yan Dai, Qiang Hu, Yibo Yang, Yi Zhou, Xiao zhang, Hemin Yang, Xuyu Wei, fuwen Chinese Acad Sci Inst Zool Key Lab Anim Ecol & Conservat Biol Beijing 100101 Peoples R China China West Normal Univ Minist Educ Key Lab Southwest China Wildlife Resources Conser Nanchong 637002 Peoples R China Sichuan Stn Wildlife Survey & Management Chengdu 635400 Sichuan Peoples R China Liziping Natl Nat Reserve Shimian 635400 Peoples R China China Giant Panda Res Ctr Dujiangyan 611830 Peoples R China Chinese Acad Sci Chengdu Inst Biol Chengdu 610041 Sichuan Peoples R China Univ Chinese Acad Sci Beijing Peoples R China

Reintroduction is an important approach in the conservation of endangered species and in recent decades a number of reintroduction programs have been conducted for conservation purposes. Generally, the success rate of reintroduction is low, but long-term monitoring of most reintroduction programs remains uncommon and this may influence the evaluation of reintroduction. The giant panda is a flagship species of biodiversity conservation. The Chinese government runs a giant panda reintroduction program and here we present reintroduction monitoring data from 2009 to 2015 for three giant pandas released into a small isolated wild population in western Sichuan, China. The results indicate that all three giant pandas display similar activity patterns to wild giant pandas, however, the wild-caught female demonstrated better adaptive ability to the wild environment than the two captive-born individuals in that she established a stable home range in the quickest time and gave birth to a cub. Genetic analysis indicates that new genetic material has been introduced into the local population. Our study provides the latest update on the giant panda introduction program and indicates that it is progressing well.

关键词： Giant panda Reintroduction Translocation Xiaoxiangling Mountains Activity rhythm Home range

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Enhanced NOLC1 promotes cell senescence and represses hepatocellular carcinoma cell proliferation by disturbing the organization of nucleolus

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AGING CELL 2017年第4期16卷 726-737页

作者： Yuan, fuwen zhang, Yu Ma, Liwei Cheng, Qian Li, Guodong Tong, Tanjun Peking Univ Hlth Sci Ctr Res Ctr AgingDept Biochem & Mol Biol Key Lab Prot Posttranslat Modificat & Cell Funct 38 Xue Yuan Rd Beijing 100191 Peoples R China Peking Univ Peoples Hosp Key Surg Basic Res Lab Liver Cirrhosis & Liver Ca Dept Hepatobilliary Surg Beijing 100044 Peoples R China

The nucleolus is a key organelle that is responsible for the synthesis of rRNA and assembly of ribosomal subunits, which is also the center of metabolic control because of the critical role of ribosomes in protein synthesis. Perturbations of rRNA biogenesis are closely related to cell senescence and tumor progression;however, the underlying molecular mechanisms are not well understood. Here, we report that cellular senescence-inhibited gene (CSIG) knockdown up-regulated NOLC1 by stabilizing the 5' UTR of NOLC1 mRNA, and elevated NOLC1 induced the retention of NOG1 in the nucleolus, which is responsible for rRNA processing. Besides, the expression of NOLC1 was negatively correlated with CSIG in the aged mouse tissue and replicative senescent 2BS cells, and the down-regulation of NOLC1 could rescue CSIG knockdown-induced 2BS senescence. Additionally, NOLC1 expression was decreased in human hepatocellular carcinoma (HCC) tissue, and the ectopic expression of NOLC1 repressed the proliferation of HCC cells and tumor growth in a HCC xenograft model.

关键词： aging CSIG hepatocellular carcinoma NOLC1 nucleolus

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Enhancing the performance of the electron acceptor ITIC-Th via tailoring its end groups

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MATERIALS CHEMISTRY FRONTIERS 2018年第3期2卷 537-543页

作者： Li, Zeyuan Dai, Shuixing Xin, Jingming zhang, Lin Wu, Yang Rech, Jeromy Zhao, fuwen Li, Tengfei Liu, Kuan Liu, Qiao Ma, Wei You, Wei Wang, Chunru Zhan, Xiaowei Peking Univ Coll Engn Dept Mat Sci & Engn Key Lab Polymer Chem & PhysMinist Educ Beijing 100871 Peoples R China Xi An Jiao Tong Univ State Key Lab Mech Behav Mat Xian 710049 Peoples R China Univ North Carolina Chapel Hill Dept Chem Chapel Hill NC 27599 USA Chinese Acad Sci Inst Chem Beijing 100190 Peoples R China

We choose the high-performance nonfullerene acceptor ITIC-Th as an example, and incorporate electron-donating methoxy and electron-withdrawing F groups onto the terminal group 1,1-dicyanomethylene-3-indanone (IC) to construct a small library of four fused-ring electron acceptors. With this series, we systematically investigate the effects of the substituents on the end-groups on the electronic properties, charge transport, film morphology, and photovoltaic properties of the ITIC-Th series. The electron-withdrawing ability increases from methoxylated to unsubstituted, fluorinated, and difluorinated IC, leading to a downshift of energy levels and a redshift of absorption spectra. Optimized organic solar cells based on the ITIC-Th series show power conversion efficiencies ranging from 8.88% to 12.1%.

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