Search results for: Zidong Wang

Items from 1 to 20 out of 452 results

article

Thioglycolic acid-capped ZnSe quantum dots as nanoprobe for cobalt(II) and iron(III) via measurement of grey level, UV-vis spectra and dynamic light scattering

Xinxin Xing, Yue Yang, Tong Zou, Zhezhe Wang, more

Microchimica Acta > 2019 > 186 > 7 > 1-11

Thioglycolic acid-functionalized ZnSe quantum dots (QDs) as a colorimetric nanoprobe were prepared and applied to the determination of cobalt(II) and iron(III). Test strips were obtained by a dipping-drying process. On exposure to Co(II), they undergo a color change from white to brown, and on exposure to Fe(III) from white to pink. The limits of detection (LOD) are 2.6 mg L⁻¹ for Co(II) and 2.2 mg L...

article

Distributed filtering for nonlinear time‐delay systems over sensor networks subject to multiplicative link noises and switching topology

Lifeng Ma, Zidong Wang, Yurong Liu, Fuad E. Alsaadi

International Journal of Robust and Nonlinear Control > 29 > 10 > 2941 - 2959

This paper is concerned with the distributed filtering problem for a class of nonlinear time‐delay system over sensor networks subject to multiplicative link noises and switching topology. Both discrete and distributed time delays are included in the system model. Each sensor estimates the system state by means of the measurements not only from itself but also from its neighboring nodes according...

article

Local design of distributed H_∞‐consensus filtering over sensor networks under multiplicative noises and deception attacks

Fei Han, Hongli Dong, Zidong Wang, Gongfa Li

International Journal of Robust and Nonlinear Control > 29 > 8 > 2296 - 2314

This paper is concerned with the local design of the distributed H_∞‐consensus filtering problem for a class of discrete time‐varying systems subject to both multiplicative noises and deception attacks over sensor networks. The target plant and the measuring sensors are disturbed by multiplicative noises with known statistics. The malicious signal involved in deception attacks is constrained by a specific...

article

H_∞ finite‐horizon filtering for complex networks with state saturations: The weighted try‐once‐discard protocol

Dong Wang, Zidong Wang, Bo Shen, Qi Li

International Journal of Robust and Nonlinear Control > 29 > 7 > 2096 - 2111

This paper addresses the finite‐horizon H_∞ filtering problem for a kind of discrete state‐saturated time‐varying complex networks subjected to the weighted try‐once‐discard (WTOD) protocol. Under the WTOD protocol, only the measurement signal from one sensor node is allowed to be transmitted to the filter at each time point, where such a node is selected based on a certain quadratic selection principle...

article

Pt decorated SnO₂ nanoparticles for high response CO gas sensor under the low operating temperature

Sijia Peng, Ping Hong, Yuxiu Li, Xinxin Xing, more

Journal of Materials Science: Materials in Electronics > 2019 > 30 > 4 > 3921-3932

Gas sensors based on noble metal/metal oxide are applied extensively, and show a relatively high response to carbon monoxide at inferior operating temperature. In this paper, a carbon monoxide sensor based on Pt decorated SnO₂ nanoparticles is obtained by a hydrothermal method. Abundant characterization methods are used to analyze the structure, morphology, chemical state and specific surface area...

article

Probabilistic‐constrained filtering for a class of nonlinear systems with improved static event‐triggered communication

Engang Tian, Zidong Wang, Lei Zou, Dong Yue

International Journal of Robust and Nonlinear Control > 29 > 5 > 1484 - 1498

This paper is concerned with the probabilistic‐constrained filtering problem for a class of time‐varying systems with stochastic nonlinearities and state constraints. An improved static event‐triggering scheme is used to reduce unnecessary signal transmissions on the communication channel, where a time‐varying triggering parameter is designed according to engineering practice. The aim of the problem...

article

On mean‐square H_∞ control for discrete‐time nonlinear stochastic systems with (x, u, v)‐dependent noises

Li Sheng, Zidong Wang, Bo Shen, Ming Gao

International Journal of Robust and Nonlinear Control > 29 > 4 > 882 - 893

In this paper, the H_∞ control problem is investigated for a general class of discrete‐time nonlinear stochastic systems with state‐, control‐, and disturbance‐dependent noises (also called (x, u, v)‐dependent noises). In the system under study, the system state, the control input, and the disturbance input are all coupled with white noises, and this gives rise to considerable difficulties in the stability...

article

‘Green’ prepare SnO₂ nanofibers by shaddock peels: application for detection of volatile organic compound gases

Rongjun Zhao, Zhezhe Wang, Tong Zou, Zidong Wang, more

Journal of Materials Science: Materials in Electronics > 2019 > 30 > 3 > 3032-3044

One-dimensional fiber-like SnO₂ nanomaterials (SnO₂ nanofibers) were prepared by ‘green’ preparation approach that using shaddock peels as bio-templates via a facile hydrothermal method for the first time. The microstructure, morphology, chemical states and specific surface areas were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron...

article

Position tracking and attitude control for quadrotors via active disturbance rejection control method

Yuan Yuan, Lei Cheng, Zidong Wang, Chong Sun

Science China Information Sciences > 2019 > 62 > 1 > 1-10

In this paper, a trigonometric-saturation-function-based position controller is designed for the quadrotor system with internal and external disturbances. Furthermore, in the attitude control problem, a dual closed-loop structure is put forward. Specifically, a nonlinear extended-state-observer (ESO) is employed to provide an estimate for the so-called total disturbance. Then, based on the estimate...

article

Finite‐horizon fault estimation under imperfect measurements and stochastic communication protocol: Dealing with finite‐time boundedness

Hongli Dong, Nan Hou, Zidong Wang, Hongjian Liu

International Journal of Robust and Nonlinear Control > 29 > 1 > 117 - 134

In this paper, we analyze the finite‐horizon fault estimation issue for a kind of time‐varying nonlinear systems with imperfect measurement signals under the stochastic communication protocol (SCP). The imperfect measurements result from randomly occurring sensor nonlinearities obeying sensor‐wise Bernoulli distributions. The Markov‐chain‐driven SCP is introduced to regulate the signal transmission...

article

Static output‐feedback sliding mode control under round‐robin protocol

Jun Song, Zidong Wang, Yugang Niu

International Journal of Robust and Nonlinear Control > 28 > 18 > 5841 - 5857

This paper addresses the static output‐feedback sliding mode control (SMC) problem for a class of uncertain control systems subject to the round‐robin protocol scheduling, in which the communication between the controller and the actuators is regulated by the round‐robin protocol, that is, only one actuator node gets the access to the transmission network at each instant and the other actuators utilize...

article

CdIn2O4 nanoporous thin film gas-sensor for formaldehyde detection

Zidong Wang, Tong Zou, Xinxin Xing, Rongjun Zhao, more

Physica E: Low-dimensional Systems and Nanostructures > 2018 > 103 > C > 18-24

This paper describes the preparation with a sol-gel method as well as formaldehyde (HCHO) gas sensing properties of CdIn₂O₄ nanoporous thin film. CdIn₂O₄ nanoporous thin film was prepared using poly(ethylene-co-butylene)-b-poly(ethylene oxide) diblock copolymers as template. The film was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscope (AFM), and...

article

Sensitive and selective n-butanol gas detection based on ZnO nanocrystalline synthesized by a low-temperature solvothermal method

Tong Zou, Rui Zhao, Zidong Wang, Rongjun Zhao, more

Physica E: Low-dimensional Systems and Nanostructures > 2018 > 103 > C > 143-150

ZnO nanocrystalline with a few nanometers in size were synthesized by a low-temperature solvothermal method from zinc acetate dihydrate (Zn(CH₃COO)₂·2H₂O), potassium hydroxide (KOH) and ethanol (C₂H₅OH). X ray diffraction (XRD), transmission electron microscopy (TEM) and X ray photoelectron spectroscopy (XPS) were used to characterize the structure, morphology, specific surface area and chemical state...

article

Pt‐Functionalized Nanoporous TiO₂ Nanoparticles With Enhanced Gas Sensing Performances Toward Acetone

Xinxin Xing, Nan Chen, Yue Yang, Rongjun Zhao, more

physica status solidi (a) > 215 > 14 > n/a - n/a

A facile hydrothermal method is used to prepare Pt‐functionalized nanoporous TiO₂ nanoparticles. These are used as gas‐sensing material in sensors, fabricated according to the indirect heating method. Gas‐sensing performance of the sensors is investigated by testing their gas response to acetone, which exhibits favorable selectivity, good gas response value, fast response/recovery time, low detection...

article

An event-triggered approach to robust recursive filtering for stochastic discrete time-varying spatial-temporal systems

Dong Wang, Zidong Wang, Bo Shen, Yongmin Li, more

Signal Processing > 2018 > 145 > C > 91-98

In this paper, the robust recursive filtering problem is investigated for a class of uncertain stochastic discrete time-varying spatial-temporal systems with an event-based communication mechanism. The system under consideration includes a set of sensors located at specified points where each sensor can only receive the measurement output from the system at corresponding position. In order to reduce...

article

Effect of surface modification temperature on the hydrodesulfurization performance of Ni₂P/MCM-41 catalyst

Hua Song, Qi Yu, Nan Jiang, Zijin Yan, more

Research on Chemical Intermediates > 2018 > 44 > 5 > 3629-3640

Highly active MCM-41-supported nickel phosphide catalysts for hydrodesulfurization (HDS) were synthesized by surface modification, in which the surface of supported Ni₂P catalysts were directly modified at different temperatures by air instead of being passivated by an O₂/N₂ mixture. In addition, the prepared catalysts need not be activated under high temperature in H₂ flow prior to the HDS reaction...

article

Recursive filtering for state‐saturated systems with randomly occurring nonlinearities and missing measurements

Chuanbo Wen, Zidong Wang, Jun Hu, Qinyuan Liu, more

International Journal of Robust and Nonlinear Control > 28 > 5 > 1715 - 1727

This paper deals with the filtering problem for a class of discrete‐time state‐saturated systems subject to randomly occurring nonlinearities and missing measurements. A set of mutually independent Bernoulli random variables is used to describe the random occurrence of the missing measurements. Due to the simultaneous consideration of the state saturation, the randomly occurring nonlinearities, and...

article

Synchronization of directed switched complex networks with stochastic link perturbations and mixed time-delays

Yurong Liu, Zidong Wang, Lifeng Ma, Ying Cui, more

Nonlinear Analysis: Hybrid Systems > 2018 > 27 > C > 213-224

In this paper, the synchronization problem is studied for a class of directed switched complex networks. The links among the nodes are perturbed by stochastic noises and the topology varies according to certain predetermined switching rules. The coupled networks under consideration are subject to mixed delays comprising both discrete and distributed ones. A new estimate of the general algebraic connectivity...

article

Asynchronous observer-based H ∞ control for switched stochastic systems with mixed delays under quantization and packet dropouts

Yonggang Chen, Zidong Wang, Wei Qian, Fuad E. Alsaadi

Nonlinear Analysis: Hybrid Systems > 2018 > 27 > C > 225-238

In this paper, the observer-based H ∞ control problem is investigated for a class of discrete-time switched stochastic systems with mixed delays comprising both discrete and distributed delays. The measurement output of the addressed system is subject to quantizations and packet dropouts. The observer/controller switching is allowed to be asynchronous with the subsystem switching. An observer-based...

article

Effect of morphologies of martensite–austenite constituents on impact toughness in intercritically reheated coarse-grained heat-affected zone of HSLA steel

Xiang Luo, Xiaohua Chen, Tao Wang, Shiwei Pan, more

Materials Science and Engineering: A > 2018 > 710 > C > 192-199

By using the gleeble-3500 simulator, three different two-pass weld thermal cycles were applied to base metal of a high strength low alloy (HSLA) steel with the purpose of obtaining martensite-austenite (MA) constituents of different morphologies in intercritically reheated coarse-grained heat-affected zones (ICGHAZ). Morphology of each MA constituent was characterized by maximum length, maximum width...

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INFONA - science communication portal

Search results for: Zidong Wang

Thioglycolic acid-capped ZnSe quantum dots as nanoprobe for cobalt(II) and iron(III) via measurement of grey level, UV-vis spectra and dynamic light scattering

Distributed filtering for nonlinear time‐delay systems over sensor networks subject to multiplicative link noises and switching topology

Local design of distributed H_∞‐consensus filtering over sensor networks under multiplicative noises and deception attacks

H_∞ finite‐horizon filtering for complex networks with state saturations: The weighted try‐once‐discard protocol

Pt decorated SnO₂ nanoparticles for high response CO gas sensor under the low operating temperature

Probabilistic‐constrained filtering for a class of nonlinear systems with improved static event‐triggered communication

On mean‐square H_∞ control for discrete‐time nonlinear stochastic systems with (x, u, v)‐dependent noises

‘Green’ prepare SnO₂ nanofibers by shaddock peels: application for detection of volatile organic compound gases

Position tracking and attitude control for quadrotors via active disturbance rejection control method

Finite‐horizon fault estimation under imperfect measurements and stochastic communication protocol: Dealing with finite‐time boundedness

Static output‐feedback sliding mode control under round‐robin protocol

CdIn2O4 nanoporous thin film gas-sensor for formaldehyde detection

Sensitive and selective n-butanol gas detection based on ZnO nanocrystalline synthesized by a low-temperature solvothermal method

Pt‐Functionalized Nanoporous TiO₂ Nanoparticles With Enhanced Gas Sensing Performances Toward Acetone

An event-triggered approach to robust recursive filtering for stochastic discrete time-varying spatial-temporal systems

Effect of surface modification temperature on the hydrodesulfurization performance of Ni₂P/MCM-41 catalyst

Recursive filtering for state‐saturated systems with randomly occurring nonlinearities and missing measurements

Synchronization of directed switched complex networks with stochastic link perturbations and mixed time-delays

Asynchronous observer-based H ∞ control for switched stochastic systems with mixed delays under quantization and packet dropouts

Effect of morphologies of martensite–austenite constituents on impact toughness in intercritically reheated coarse-grained heat-affected zone of HSLA steel

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