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Event-based H∞ control for piecewise-affine systems subject to actuator saturation Research Articles

Yonghao Jiang, Wei Wu, Xuyang Lou, Zhengxian Jiang, Baotong Cui,y.h.jiang@foxmail.com,weiwu@jiangnan.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 5,   Pages 615-766 doi: 10.1631/FITEE.1900601

Abstract: We deal with event-triggered controller design for discrete-time s subject to . By considering saturation information, a novel event-triggered strategy is proposed to conserve communication resources. A based condition is derived based on a piecewise Lyapunov function. This condition guarantees the stability of the closed-loop system with a certain index and reduces the number of transmitted signals. Numerical examples are given to show the efficiency of our method.

Keywords： 事件触发控制；分段仿射系统；线性矩阵不等式；执行器饱和；H∞性能    

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Nonlinear dynamic analysis for elastic robotic arms

H. KORAYEM, H. N. RAHIMI

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 2,   Pages 219-228 doi: 10.1007/s11465-011-0218-y

Abstract:

The aim of the paper is to analyze the nonlinear dynamics of robotic arms with elastic links and joints. The main contribution of the paper is the comparative assessment of assumed modes and finite element methods as more convenient approaches for computing the nonlinear dynamic of robotic systems. Numerical simulations comprising both methods are carried out and results are discussed. Hence, advantages and disadvantages of each method are illustrated. Then, adding the joint flexibility to the system is dealt with and the obtained model is demonstrated. Finally, a brief description of the optimal motion generation is presented and the simulation is carried out to investigate the role of robot dynamic modeling in the control of robots.

Keywords： robotic arms     elastic link     elastic joint     nonlinear dynamics     optimal control    

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Endemicity of H9N2 and H5N1 avian influenza viruses in poultry in China poses a serious threat to poultry

Jiao HU,Xiufan LIU

Frontiers of Agricultural Science and Engineering 2016, Volume 3, Issue 1,   Pages 11-24 doi: 10.15302/J-FASE-2016092

Abstract: The H9N2 and H5N1 avian influenza viruses (AIVs) have been circulating in poultry in China and becomeof influenza viruses, such as the well-known viruses of the highly pathogenic avian influenza (HPAI) H5N2and the 2013 novel H7N7, H7N9 and H10N8 subtypes, thereby threatening both the poultry industry and

Keywords： avian influenza virus     H9N2     H5N1     novel viruses     public health    

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Development progress of China’s 600 km/h high-speed magnetic levitation train

Frontiers of Engineering Management 2022, Volume 9, Issue 3,   Pages 509-515 doi: 10.1007/s42524-022-0199-z

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Keywords： 600 km/h high-speed magnetic levitation train     development history     technological innovation    

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growth of a-few-layered MoS on CdS nanorod for high efficient photocatalytic H production

Frontiers in Energy 2021, Volume 15, Issue 3,   Pages 752-759 doi: 10.1007/s11708-021-0779-3

Abstract: grown on CdS nanorod by a solid state method using sulfur powder as sulfur source for photocatalytic Hm(MoS2): m(CdS) = 1: 50 (m is mass) reaches 542 μmol/h,which is 6 times of that on pure CdS (92 μmol/h).

Keywords： photocatalytic H2 production     CdS     MoS2 cocatalyst     charge separation    

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Probes and nano-delivery systems targeting NAD(P)H:quinone oxidoreductase 1: a mini-review

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 2,   Pages 123-138 doi: 10.1007/s11705-022-2194-7

Abstract: The two-electron cytoplasmic reductase NAD(P)H:quinone oxidoreductase 1 is expressed in many tissues.NAD(P)H:quinone oxidoreductase 1 is well-known for being highly expressed in most cancers.Because it is a quinone reductase, many bioimaging probes based on quinone structures target NAD(P)H:fluorescent, near-infrared and two-photon fluorescent probes, as well as nanosystems for delivering the NAD(P)H:valuable information for the future development of probes and nano-delivery systems that target NAD(P)H:

Keywords： NAD(P)H:quinone oxidoreductase 1     cancer therapy     target     probe     nanosystem    

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Influence of short chain ceramides and lipophilic penetration enhancers on the nano-structure of stratum corneum model membranes studied using neutron diffraction

Annett SCHROETER, Tanja ENGELBRECHT, Reinhard H. H. NEUBERT

Frontiers of Chemical Science and Engineering 2013, Volume 7, Issue 1,   Pages 29-36 doi: 10.1007/s11705-013-1302-0

Abstract: H NMR spectroscopy was used to study the impact of the ceramides’ degree of order within the stratumThe H NMR spectroscopic measurements showed that CER[NP] based ternary model system had a higher state

Keywords： of the stratum corneum     ceramide     penetration enhancer     model membrane     neutron diffraction     2H    

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Effect of Radial Porosity Oscillation on the Thermal Performance of Packed Bed Latent Heat Storage Article

H. B. Liu, C. Y. Zhao

Engineering 2021, Volume 7, Issue 4,   Pages 515-525 doi: 10.1016/j.eng.2020.05.020

Abstract:

Owing to its high heat storage capacity and fast heat transfer rate, packed bed latent heat storage (LHS) is considered as a promising method to store thermal energy. In a packed bed, the wall effect can impact the packing arrangement of phase change material (PCM) capsules, inducing radial porosity oscillation. In this study, an actual-arrangement-based three-dimensional packed bed LHS model was built to consider the radial porosity oscillation. Its fluid flow and heat transfer were analyzed. With different cylindrical sub-surfaces intercepted along the radial direction in the packed bed, the corresponding relationships between the arrangement of capsules and porosity oscillation were identified. The oscillating distribution of radial porosity led to a non-uniform distribution of heat transfer fluid (HTF) velocity. As a result, radial temperature distributions and liquid fraction distributions of PCMs were further affected. The effects of different dimensionless parameters (e.g., tube-to-capsule diameter ratio, Reynolds number, and Stefan number) on the radial characteristics of HTF and PCMs were discussed. The results showed that different diameter ratios correspond to different radial porosity distributions. Further, with an increase in diameter ratio, HTF velocity varies significantly in the near wall region while the non-uniformity of HTF velocity in the center region will decrease. The Reynolds and Stefan numbers slightly impact the relative velocity distribution of the HTF—while higher Reynolds numbers can lead to a proportional improvement of velocity, an increase in Stefan number can promote heat storage of the packed bed LHS system.
 

Keywords： Packed bed latent heat storage     Radial porosity oscillation     Fluid flow     Heat transfer     Diameter ratio    

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A new technique for islanding operation of distribution network connected with mini hydro

LAGHARI,H. MOKHLIS,M. KARIMI,A. H. A. BAKAR,Hasmaini MOHAMAD

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 5,   Pages 418-427 doi: 10.1631/FITEE.1400309

Abstract: An islanding operation of a distribution network is a topic of interest due to the significant penetration of distributed generation (DG) in a power system network. However, controlling the frequency of an islanded distribution system remains an unresolved issue, especially when the load exceeds the generation. This paper presents a new technique for a successful islanding operation of a distribution network connected with multiple mini hydro based DGs. The proposed technique is based on three main parts. The first part uses an islanding detection technique to detect the islanding event correctly. The second part consists of a power imbalance estimation module (PIEM), which determines the power imbalance between the generation and load demand. The third part consists of a load shedding controller, which receives the power imbalance value and performs load shedding according to load priority. The proposed technique is validated on an 11 kV existing Malaysia distribution network. The simulation results show that the proposed technique is effective in performing a successful islanding operation by shedding a significant number of loads.

Keywords： Islanding operation     Mini hydro     Distributed generation (DG)     Islanding detection     Load shedding    

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Plasma enhanced chemical vapor deposition of excellent a-Si:H passivation layers for a-Si:H/c-Si heterojunction

Lei ZHAO,Wenbin ZHANG,Jingwei CHEN,Hongwei DIAO,Qi WANG,Wenjing WANG

Frontiers in Energy 2017, Volume 11, Issue 1,   Pages 85-91 doi: 10.1007/s11708-016-0437-3

Abstract: The intrinsic a-Si:H passivation layer inserted between the doped a-Si:H layer and the c-Si substrateis very crucial for improving the performance of the a-Si:H/c-Si heterojunction (SHJ) solar cell.The passivation performance of the a-Si:H layer is strongly dependent on its microstructure.Usually, the compact a-Si:H deposited near the transition from the amorphous phase to the nanocrystallineIn this paper, intrinsic a-Si:H layers were prepared on n-type Cz c-Si substrates by 27.12 MHz PECVD

Keywords： PECVD     high pressure and high power     a-Si:H microstructure     passivation     heterojunction solar cell    

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Bimetallic Oxyhydroxide as a High-Performance Water Oxidation Electrocatalyst under Industry-Relevant Conditions Article

Jiaxin Yuan, Xiaodi Cheng, Chaojun Lei, Bin Yang, Zhongjian Li, Kun Luo, K.H.

Engineering 2021, Volume 7, Issue 9,   Pages 1306-1312 doi: 10.1016/j.eng.2020.01.018

Abstract:

Developing high-performing oxygen evolution reaction (OER) electrocatalysts under high-current operation conditions is critical for future commercial applications of alkaline water electrolysis for clean energy generation. Herein, we prepared a three-dimensional (3D) bimetallic oxyhydroxide hybrid grown on a Ni foam (NiFeOOH/NF) prepared by immersing Ni foam (NF) into Fe(NO3)3 solution. In this unique 3D structure, the NiFeOOH/NF hybrid was composed of crystalline Ni(OH)2 and amorphous FeOOH evenly grown on the NF surface. As a bimetallic oxyhydroxide electrocatalyst, the NiFeOOH/NF hybrid exhibited excellent catalytic activity, surpassing not only the other reported Ni–Fe based electrocatalysts, but also the commercial Ir/C catalyst. In situ electrochemical Raman spectroscopy demonstrated the active FeOOH and NiOOH phases involved in the OER process. Profiting from the synergy of Fe and Ni catalytic sites, the NiFeOOH/NF hybrid delivered an outstanding OER performance under challenging industrial conditions in a 10.0 mol∙L-1 KOH electrolyte at 80 ºC, requiring potentials as small as 1.47 and 1.51 V to achieve the super-high catalytic current densities of 100 and 500 mA∙cm-2, respectively.

Keywords： Bimetallic oxyhydroxide     3D hybrid     electrocatalysis     oxygen evolution reaction     high current density    

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Research progress on human infection with avian influenza H7N9

Xiaoxin Wu, Lanlan Xiao, Lanjuan Li

Frontiers of Medicine 2020, Volume 14, Issue 1,   Pages 8-20 doi: 10.1007/s11684-020-0739-z

Abstract: Since the first case of novel H7N9 infection was reported, China has experienced five epidemics of H7N9During the fifth wave, a highly pathogenic H7N9 strain emerged.Meanwhile, the H7N9 virus continues to accumulate mutations, and its affinity for the human respiratorycharacteristics of H7N9, the key gene mutations of the virus, and H7N9 vaccine, thus providing a scientificbasis for further monitoring and prevention of H7N9 influenza epidemics.

Keywords： H7N9     pandemic     epidemiology     mutations     vaccine     influenza    

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Function-geometry integrated precision machining methodsand technologies for high performance workpieces

Guo Dongming

Strategic Study of CAE 2011, Volume 13, Issue 10,   Pages 47-57

Abstract:

With the expansion of high-end equipments and products, performance tolerance standard of some equipments and products becomes more and more high. In this case, a large number of high performance parts come into being. The machining of these key parts has changed from pure geometric accuracy requirements to performance-geometry integrated precision machining requirements under the premise of taking performance requirements as a primary target. Such high performance parts often have complex surfaces and ultra-high machining accuracy, and consequently use difficult-to-cut materials with supper-hard, supper-brittle or supper-sticky characteristics. Due to the case that the part performance has complex coupled effect with many factors such as part geometry and material, it is rather difficult to manufacture with a high precision when using traditional machining processes, which often lead to high rejection rate, low machining efficiency and particularly out-of-tolerance part performance. For satisfying the requirement of manufacturing industry, a new digital machining way for high performance key parts is presented in this paper. The characteristics and classified system of high performance key parts are described. Then reasons of high product rejection rate using experiential method and connotations of positive digital machining of complex surfaces are subsequently expounded. Key issues and their research statuses, existing problems and solving measures of positive machining technologies are finally discussed in detail. It provides an effective reference and guidance for the establishment of performance-geometry integrated machining principle, method and process technologies, and then as a result to solve the issue of the precision manufacture of high performance parts.

Keywords： high performance     function-geometry integration     precision machining     difficult-to-cut material     complex surface    

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Photoelectrocatalytic generation of H and S from toxic HS by using a novel BiOI/WO nanoflake array photoanode

Frontiers in Energy 2021, Volume 15, Issue 3,   Pages 744-751 doi: 10.1007/s11708-021-0775-7

Abstract: In this paper, a photoelectrocatalytic (PEC) recovery of toxic H2S into H2 andmml:msubsup> catalytic system, the PEC system toward splitting of HH2 was simultaneously generated at a rate of about 0.867 mL/(h·cm).The proposed PEC H2S splitting system provides an efficient and sustainable route to recoverH2 and S.

Keywords： oxyiodide (BiOI)/ tungsten trioxide (WO3) nano-flake arrays (NFA)     photoelectrocatalytic (PEC)     H2S splitting     H2     S    

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Anovel approach of noise statistics estimate using H∞ filter in target tracking

Xie WANG,Mei-qin LIU,Zhen FAN,Sen-lin ZHANG

Frontiers of Information Technology & Electronic Engineering 2016, Volume 17, Issue 5,   Pages 449-457 doi: 10.1631/FITEE.1500262

Abstract: First, we apply the H∞ filter to obtain the system state estimates without the common assumptions aboutThen by applying state estimates obtained from the H∞ filter, better estimates of the noise mean and

Keywords： Noise estimate     H∞     filter     Target tracking    

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Title Author Date Type Operation

Event-based H∞ control for piecewise-affine systems subject to actuator saturation

Yonghao Jiang, Wei Wu, Xuyang Lou, Zhengxian Jiang, Baotong Cui,y.h.jiang@foxmail.com,weiwu@jiangnan.edu.cn

Journal Article

Nonlinear dynamic analysis for elastic robotic arms

H. KORAYEM, H. N. RAHIMI

Journal Article

Endemicity of H9N2 and H5N1 avian influenza viruses in poultry in China poses a serious threat to poultry

Jiao HU,Xiufan LIU

Journal Article

Development progress of China’s 600 km/h high-speed magnetic levitation train

Journal Article

growth of a-few-layered MoS on CdS nanorod for high efficient photocatalytic H production

Journal Article

Probes and nano-delivery systems targeting NAD(P)H:quinone oxidoreductase 1: a mini-review

Journal Article

Influence of short chain ceramides and lipophilic penetration enhancers on the nano-structure of stratum corneum model membranes studied using neutron diffraction

Annett SCHROETER, Tanja ENGELBRECHT, Reinhard H. H. NEUBERT

Journal Article

Effect of Radial Porosity Oscillation on the Thermal Performance of Packed Bed Latent Heat Storage

H. B. Liu, C. Y. Zhao

Journal Article

A new technique for islanding operation of distribution network connected with mini hydro

LAGHARI,H. MOKHLIS,M. KARIMI,A. H. A. BAKAR,Hasmaini MOHAMAD

Journal Article

Plasma enhanced chemical vapor deposition of excellent a-Si:H passivation layers for a-Si:H/c-Si heterojunction

Lei ZHAO,Wenbin ZHANG,Jingwei CHEN,Hongwei DIAO,Qi WANG,Wenjing WANG

Journal Article

Bimetallic Oxyhydroxide as a High-Performance Water Oxidation Electrocatalyst under Industry-Relevant Conditions

Jiaxin Yuan, Xiaodi Cheng, Chaojun Lei, Bin Yang, Zhongjian Li, Kun Luo, K.H.

Journal Article

Research progress on human infection with avian influenza H7N9

Xiaoxin Wu, Lanlan Xiao, Lanjuan Li

Journal Article

Function-geometry integrated precision machining methodsand technologies for high performance workpieces

Guo Dongming

Journal Article

Photoelectrocatalytic generation of H and S from toxic HS by using a novel BiOI/WO nanoflake array photoanode

Journal Article

Anovel approach of noise statistics estimate using H∞ filter in target tracking

Xie WANG,Mei-qin LIU,Zhen FAN,Sen-lin ZHANG

Journal Article