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Global practical tracking via disturbance rejection control for uncertain nonlinear systems with quantized input and output

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Science China(Information Sciences) 2022年第1期65卷 279-281页

作者： Debao FAN xianfu zhang Yanjie CHANG Xiaodong LU School of Control Science and Engineering Shandong University School of Mathematics and Statistics Shandong Normal University

Dear editor,With the rapid development of digital control systems and other fields, quantized control has attracted increasing attention [1]. Although considerable research has been conducted on the analysis of quantized control systems, most of the theoretical results are based on a single quantizer. In real life, when the distance between devices and controllers is relatively remote,

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Quantized control for the class of feedforward nonlinear systems

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Science China(Information Sciences) 2019年第8期62卷 207-209页

作者： Hanfeng LI Qingrong LIU xianfu zhang XiANDong CHEN School of Control Science and Engineering Shandong University School of Mathematics and Quantitative Economics Shandong University of Finance and Economics

Dear editor,In certain practical systems, quantized control can effectively solve stabilization problems in intelligent transportation systems and digital systems [1]. Constant progress has been made on linear quantization systems. The problems of input quantization and output quantization were studied in [2] for the class of linear systems us-

关键词： Quantized control for the class of feedforward nonlinear systems

Pathological basal ganglia oscillations with time delays:a memoryless feedback control strategy

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Control Theory and Technology 2024年第4期22卷 568-580页

作者： Yuhe Xia xianfu zhang Shengxiang Xia Mingyue Wu Yiyu Feng School of Control Science and Engineering Shandong UniversityJinan250061ShandongChina School of Science Shandong Jianzhu UniversityJinan250101ShandongChina

Pathological basal ganglia oscillations are associated with the hypokinetic motor symptoms of Parkinson’s *** this paper,a memoryless feedback control strategy is proposed to suppress pathological oscillations in the basal *** the most of closed-loop control strategies,the excitatory subthalamic nucleus populations are both monitored and stimulated targets,neglecting the important contribution of the external globus pallidus populations in suppressing pathological *** this end,we transform the original model into a time-delay system with a lower-triangular structure,and construct a memoryless state feedback controller utilizing the gain scaling *** is proved by the Lyapunov–Krasovskii functional method that all the signals of the resulting closed-loop system are bounded,and the system states converge to an adjustable region of the *** addition,the input delay in stimulating the target is considered and a corresponding controller is designed to achieve convergence of the states in the resulting closed-loop system with both state delays and input ***,simulation tests are conducted to explore the performance of the control *** paper further explores the intrinsic dynamics in the neural system,and provides an effective strategy for closed-loop deep brain stimulation control.

关键词： Parkinson’s disease Pathological oscillations Memoryless feedback Lower-triangular structure Time delays

Exponential Stability for Nonlinear Systems with Time Delay on Time Scales via Wirtinger-Based Inequality 36

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Exponential Stability for Nonlinear Systems with Time Delay ...

Pyridine-triphenylamine hole transport material for inverted perovskite solar cells

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作者： Xiaodong Lu xianfu zhang Qingrong Liu School of Control Science and Engineering Shandong University School of Mathematics and Quantitative Economics Shandong University of Finance and Economics

ISBN: (纸本)9781538629185

In this paper, the problem of exponential stability for nonlinear systems with time delay on time scales is *** on the Wirtinger-based inequality on time scales, and the Lyapunov-Krasovskii functional approach, a sufficient criterion for exponential stability for nonlinear time-delay systems on time scales is derived. It is shown that the idea of this paper provides a unified approach to study the exponential stability problems for continuous-time systems and their discrete-time counterparts simultaneously. To illustrate the effectiveness of our result, two simulation examples are given.

关键词： Exponential stability Wirtinger-based inequality Time delay Time scale

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Journal of Energy Chemistry 2021年第3期30卷 395-402页

作者： Shuang Ma xianfu zhang Xuepeng Liu Rahim Ghadari Molang Cai Yong Ding Muhammad Mateen Songyuan Dai Beijing Key Laboratory of Novel Thin-Film Solar Cells North China Electric Power UniversityBeijing 102206China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijing 102206China Computational Chemistry Laboratory Department of Organic and BiochemistryFaculty of ChemistryUniversity of TabrizTabriz ***Iran

In the light of superior interaction between pyridine unit and perovskite,a facile star-shaped triphenylamine-based hole transport material(HTM)incorporating pyridine core(coded as H-Pyr)is designed and synthesized.A reference HTM with benzene core,coded as H-Ben,is also prepared for a comparative *** effects of varying core on HTMs are investigated by comparing the photophysical,electrochemical and hole mobility *** is found that pyridine core exhibits better conjunction and decreased dihedral angles with triphenylamine side arms than that of benzene,leading to obviously better hole mobility and well-matched work *** perovskite film prepared on H-Pyr also shows improved crystallization than on *** and electrochemical impedance studies indicate improved charge extraction and reduced recombination in the H-Pyr-based perovskite solar ***,H-Pyr-based device exhibits higher efficiency than H-Ben-based *** doping with a Lewis acid,tris(pentafluorophenyl)borane,H-Pyr-based device delivers a champion efficiency of 17.09%,which is much higher compared with 12.14% of the device employing conventional poly(3,4-ethy lenedioxythiophene)polystyrene sulfonate(PEDOT:PSS)as ***,the H-Pyr-based device displays good long-term stability that the power conversion efficiency remains over 80% of the initial value after storage in ambient(relative humidity=50±5%)for 20 days.

关键词： Perovskite solar cell Hole transport material Pyridine-triphenylamine small molecule

Inkjet-Printing Controlled Phase Evolution Boosts the Efficiency of Hole Transport Material Free and Carbon-Based CsPbBr_(3) Perovskite Solar Cells Exceeding 9%

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Energy & Environmental Materials 2024年第2期7卷 209-220页

作者： Lihua zhang Shi Chen Jie Zeng Zhengyan Jiang Qian Ai xianfu zhang Bihua Hu Xingzhu Wang Shihe Yang Baomin Xu Department of Materials Science and Engineering and Shenzhen Engineering Research and Development Center for Flexible Solar Cells Southern University of Science and TechnologyShenzhen 518055China Department of Chemistry The Hong Kong University of Science and TechnologyClear Water BayHong KongChina Henan Key Laboratory of Photovoltaic Materials Henan UniversityKaifeng 475004China Guangdong Key Lab of Nano-Micro Material Research School of Chemical Biology and BiotechnologyShenzhen Graduate SchoolPeking UniversityShenzhen 518055China Key University Laboratory of Highly Efficient Utilization of Solar Energy and Sustainable Development of Guangdong Southern University of Science and TechnologyShenzhen 518055China Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices Southern University of Science and TechnologyShenzhen 518055China

Hole transport material free carbon-based all-inorganic CsPbBr_(3)perovskite solar cells(PSCs)are promising for commercialization due to its low-cost,high open-circuit voltage(V_(oc))and superior *** to the different solubility of PbBr_(2)and CsBr in conventional solvents,CsPbBr_(3)films are mainly obtained by multi-step spin-coating through the phase evolution from PbBr_(2)to CsPb_(2)Br_(5)and then to CsPbBr_(3).The scalable fabrication of high-quality CsPbBr_(3)films has been rarely ***,an inkjet-printing method is developed to prepare high-quality CsPbBr_(3)*** formation of long-range crystalline CsPb_(2)Br_(5)phase can effectively improve phase purity and promote regular crystal stacking of CsPbBr_(3).Consequently,the inkjet-printed CsPbBr_(3)C-PSCs realized PCEs up to 9.09%,8.59%and 7.81%with active areas of 0.09,0.25,and 1 cm^(2),respectively,demonstrating the upscaling potential of our fabrication method and *** high performance is mainly ascribed to the high purity,strong crystal orientation,reduced surface roughness and lower trap states density of the as-printed CsPbBr_(3)*** work provides insights into the relationship between the phase evolution mechanisms and crystal growth dynamics of cesium lead bromide halide films.

关键词： all-inorganic perovskite solar cells CsPbBr_(3) inkjet-printing phase evolution

C≡N-based carbazole-arylamine hole transporting materials for perovskite solar cells: Substitution position matters

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Journal of Energy Chemistry 2021年第11期30卷 563-571,I0013页

作者： Zi'an Zhou xianfu zhang Rahim Ghadari Xuepeng Liu Wenjun Wang Yong Ding Molang Cai Jia Hong Pan Songyuan Dai Beijing Key Laboratory of Novel Thin-Film Solar Cells North China Electric Power UniversityBeijing 102206China Computational Chemistry Laboratory Department of Organic and BiochemistryFaculty of ChemistryUniversity of TabrizTabriz ***Iran

Hole transporting materials(HTMs)containing passivating groups for perovskite materials have attracted much attention for efficient and stable perovskite solar cells(PSCs).Among them,C≡N-based molecules have been proved as efficient ***,a series of novel C≡N functionalized carbazole-arylamine derivatives with variable C≡N substitution positions(para,meta,and ortho)on benzene-carbazole skeleton(on the adjacent benzene of carbazole)were synthesized(p-HTM,m-HTM and o-HTM).The experimental results exhibit that the substitution positions of the Ctriple bondN unit on HTMs have minor difference on the HOMO energy level and hydrophobicity.m-HTM has a relatively lower glass transition temperature compared with that of p-HTM and *** functional theory calculations show that the C≡N located on meta position exposed very well,and the exposure direction is also the same with the *** applying these molecules as HTMs in PSCs,their device performance is found to sensitively depend on the substitution position of the C≡N unit on the molecule *** devices using m-HTM and o-HTM exhibit better performance than that of ***,m-HTM-based devices exhibit better light-soaking performance and long-term stability,which could be resulted from better interaction with the perovskite according to DFT ***,we further prepared a HTM with two C≡N units on the symmetrical meta position of molecular skeleton(2m-HTM).Interestingly,2m-HTM-based devices exhibit relatively inferior performance compared with that of the m-HTM,which could be resulted from weak negative electrical character of C≡N unit on *** results give some new insights for designing ideal HTM for efficient and stable PSCs.

关键词： Hole transporting materials Cyano group Substitution position Perovskite solar cells

Heteroatom engineering on spiro-type hole transporting materials for perovskite solar cells

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Journal of Energy Chemistry 2022年第4期31卷 19-26页

作者： xianfu zhang Xuepeng Liu Nan Wu Rahim Ghadari Mingyuan Han Ying Wang Yong Ding Molang Cai Zuopeng Qu Songyuan Dai School of New Energy North China Electric Power UniversityBeijing 102206.China Computational Chemistry Laboratory Department of Organic and BiochemistryFaculty of ChemistryUniversity of TabrizTabriz ***Iran

A series of spiro-type hole transporting materials, spiro-OMe TAD, spiro-SMe TAD and spiro-OSMe TAD,with methoxy, methylsulfanyl or half methoxy and half methylsulfanyl terminal groups are designed and prepared. The impact of varied terminal groups on bulk properties, such as photophysical, electrochemical, thermal, hole extraction, and photovoltaic performance in perovskite solar cells is *** is noted that the terminal groups of the hole transporting material with half methoxy and half methylsulfanyl exhibit a better device performance and decreased hysteresis compared with all methoxy or methylsulfanyl counterparts due to better film-forming ability and improved hole extraction ***, the spiro-OSMe TAD also shows comparable performance than high-purity commercial spiro-OMe TAD. Moreover, the highest power conversion efficiency of the optimized device employing spiro-OSMe TAD exceeding 20% has been achieved.

关键词： Hole transporting materials Methylsulfanyl Methoxy Perovskite solar cells

Behavioural responses of ex-situ captive hippopotamus (Hippopotamus amphibius) in lactation season: Maternal investment and plasticity of infant self-independence

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Frontiers in Biology 2010年第6期5卷 556-563页

作者： Wei CHEN Mallikarjun PHANDIGUND Jinghua MA Lucia Lopez LOPEZ xianfu zhang Department of Evolutionary Ecology and Genetics Zoological InstituteUniversity of KielKiel 24118Germany Ecology Center University of KielKiel 24118Germany Hangzhou Wildlife Park Hangzhou 311422China Breeding Base for State Key Laboratory of Subtropical Forest Cultivation Zhejiang A&F UniversityZhejiang UniversityHangzhou 311300China

In order to promote hippopotamus manage-ment in the captive and ex-situ environment,especially the control of behavioural and physiological status during breeding and lactation seasons,we conducted a prelimin-ary study on behavioural responses of a pair of hippos including both mother and infant in Hangzhou Wildlife Park,*** study of the captive hippos for about 1-month in the lactation season was carried out during August and September,*** behavioural patterns were identiﬁed by all occurrence sampling and instanta-neous scanning sampling methods with 5–10 min *** a result,mother-offspring conﬂicts and interactions did occur throughout the whole study *** maternal investment showed a positive trend in activity rhythms(slope=0.0014,Z=0.3027,P<0.001)and a negative trend(slope=–0.0066,Z=0.8807,P<0.001)in territorial occupation of water,all of which supported our hypotheses that the mother hippo might exert less care for the infant and cut down on her own obligations in *** infant self-independence,during the whole lactation season,the primary trends of activities and territorial occupation dynamics of the infant hippo were slightly different from before,judging from linear models(slope=–0.0017,Z=0.3309,P<0.001).However,the frequencies of activities were not stable,especially at around 12 days of *** trends of territorial occupation(slope=–0.0071,Z=0.904,P<0.001)also showed negative dynamics in water body occupation by the time the infant hippo grew *** general trend(slope=–0.005,Z=0.06,P<0.001)of suckling dynamics was demonstrably negative,with an upwardsﬂuctuation at period 3(10–15th day).This also illustrated that as the infant developed,the dependency on the mother was reduced at the end of the lactation *** addition,a sharp decline between P3 and P4 also supported the mother-offspring conﬂict *** general,time budgets of hippos in active behaviour were(31.8�2.1)%for the mother and(32.1�2.6)%for the ***

关键词： hippopotamus(hippopotamus amphibius) behaviour captive maternal investment infant indepen-dence lactation season zoo