Article
Chemistry, Multidisciplinary
Zhihua Lin, Changyong Gao, Daolin Wang, Qiang He
Summary: This study presents a bubble-propelled Janus gallium/zinc (Ga/Zn) micromotor with good biocompatibility and biodegradability, which can actively target bacteria for treatment. The micromotors exhibit self-propulsion in simulated gastroenteric acid and enhanced antibacterial efficiency against H. pylori compared to passive Ga microparticles. The Ga/Zn micromotors combine self-propulsion, biocompatibility, biodegradability, and Ga-based antibacterial properties, showing promise for active treatment of bacterial infections.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Materials Science, Multidisciplinary
Tijana Maric, Sylvia Atladottir, Lasse Hojlund Eklund Thamdrup, Oleksii Ilchenko, Mahdi Ghavami, Anja Boisen
Summary: Oral administration of drugs is a comfortable and painless method that has gained significant attention. However, there are challenges such as enzymatic degradation, pH variations in the gastrointestinal tract, and continuous mucus secretion. This study utilized biocompatible and non-toxic micromotors as microdevices to achieve targeted drug release through their impressive motion capabilities.
APPLIED MATERIALS TODAY
(2022)
Article
Chemistry, Multidisciplinary
Ke Wang, Enhui Ma, Haohao Cui, Zhenqi Hu, Hong Wang
Summary: Self-propelled micromotors based on natural fibers are developed, which facilitate the migration of remediation reagents and achieve efficient degradation of organic pollutants in soil. The micromotors display enhanced horizontal and vertical migration in the subsurface environment and exhibit excellent catalytic performances toward the degradation of a wide spectrum of antibiotics and hydrocarbons.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Chengjie Qu, Meng Ren, Zhuangming Qiao, Xiaohua Ren, Weilin Guo
Summary: A novel microfluidic approach using microfiber confinement was developed to fabricate droplet-templated micromotors for water treatment. By adjusting flow rates and coating nanoparticles on the surface, precise control over the shape and size of resulting micromotors can be achieved, showing good bubble-propelled motion and effective pollutant degradation capacity.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Qiao Yu, Baihai Su, Weifeng Zhao, Changsheng Zhao
Summary: A self-propelled chitosan-based hydrogel with CaCO3 was developed for efficient hemostasis, using the release of Ca2+ to accelerate clot formation and achieve excellent hemostatic efficiency.
Article
Engineering, Marine
Jiajian Liang, Jiaqiao Liang, Wenkai Huang, Fobao Zhou, Guojian Lin, Zhiwen Su
Summary: This paper proposes a dynamic control system (DS-Vector) based on vector propulsion to address the trajectory tracking problem of vector AUVs under complex sea conditions. The effectiveness and robustness of the proposed DS-Vector are verified in an underwater visual simulation environment. The results show that the proposed control method has better control performance compared to other advanced control laws.
Article
Agriculture, Multidisciplinary
Z. Tang, H. Wang, S. Liu, D. Lu, Y. Tang
Summary: This article introduces an intelligent combine harvester for small green vegetables and provides a detailed explanation of its construction and technical features. The study found that the harvester has high harvesting efficiency and low loss rate, which is of great significance for the intelligent mechanized harvesting of small green vegetables.
JOURNAL OF AGRICULTURAL SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Mechanical
Zhu Jiapeng, Liao Maolin, Joseph Paez Chavez, Liu Yang, Li Tingrui
Summary: This work focuses on the control optimization of a self-propelled capsule used for endoscopic diagnosis in the small intestine. The study combines an existing capsule model with the intestinal peristalsis and its internal environment to better understand the dynamics of the self-propelled capsule. Various realistic targets, including the capsule's speed, impact force, and energy consumption, are considered in the optimization study. The effects of uncertainty in the small intestine environment are also accounted for. A multi-objective optimization strategy based on NSGA-II, Monte Carlo, and Six-Sigma algorithms is developed, considering both control and structural model parameters. Extensive numerical simulations demonstrate the effectiveness of the proposed optimization strategy.
NONLINEAR DYNAMICS
(2023)
Article
Green & Sustainable Science & Technology
Abdul Ghafoor, Fraz Ahmad Khan, Farzaneh Khorsandi, Muhammad Azam Khan, Hafiz Muhammad Nauman, Muhammad Usman Farid
Summary: In most Asian countries, farmers have smallholdings and traditional tractor-mounted boom sprayers are not practical. Therefore, a prototype self-propelled crop sprayer was developed, which has shown good spray characteristics and lower spraying cost in laboratory and field tests.
Article
Mechanics
Yao Yan, Baoquan Zhang, Yang Liu, Shyam Prasad
Summary: This paper investigates the dynamics of a vibro-impact capsule moving in the small intestine. It is found that the capsule always performs period-1 motion when the driving force is small, and fold crossing requires a large excitation amplitude. The inner mass, frictional coefficient, and fold's height have a significant influence on capsule's crossing motion.
Article
Mathematics
Weijun Hu, Jiale Quan, Xianlong Ma, Mostafa M. M. Salah, Ahmed Shaker
Summary: This paper presents a new method for controlling the position and speed of a small-scale helicopter based on optimal model predictive control. The proposed method uses the homotopy perturbation technique to analytically solve the optimization problem and find the control signal. The method has been tested on a small-scale helicopter system and compared with conventional predictive control method, showing high proficiency in dealing with uncertainties and disturbances.
Article
Engineering, Marine
Yu Wang, Yujie Wang, Yaxin Li, Cheng Ren
Summary: This paper proposes a hybrid propulsion-based small underwater robot for robust trajectory tracking control in a harsh and complex underwater environment. The proposed control architecture ensures the stability and robustness of the robot's trajectory tracking.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Automation & Control Systems
Wenlong Yang, Zongying Shi, Yisheng Zhong
Summary: This paper aims to address the trajectory tracking problems of small fixed-wing unmanned aerial vehicles using adaptive techniques. Based on feedback linearization techniques, the authors derive linear models with equivalent disturbances and propose a robust adaptive control strategy for position control. The theoretical closed-loop stability is investigated using Lyapunov arguments.
Article
Engineering, Ocean
Guofang Chen, Mingwei Sheng, Lei Wan, Yihui Liu, Ziyang Zhang, Yufei Xu
Summary: This paper investigates the fixed-time trajectory tracking problem of small autonomous underwater vehicles (S-AUVs) in the Trans-Atlantic Geotraverse (TAG) active mound with various challenging factors. The author proposes an adaptive fault-tolerant trajectory tracking control law with an auxiliary dynamic system (ADS), which incorporates a high-order adaptive extended state observer (ESO) and a continuous fixed-time sliding mode manifold. Comprehensive simulations validate the effectiveness and superiority of the proposed algorithm.
APPLIED OCEAN RESEARCH
(2022)
Article
Engineering, Electrical & Electronic
Chuang Liu, Xinsheng Wang, Tong Yao, Xiaoli Wang
Summary: In this paper, a distributed self-triggered H infinity consensus-based control scheme is proposed for voltage and frequency restoration control in AC microgrid systems. The communication burden is reduced by using a self-triggered communication mechanism based on event-triggered schemes. By applying the H infinity theory and Lyapunov-Krasovskii theory, the conditions for robust consensus convergence under self-triggered and uncertain time-varying delay communication are obtained. Simulation results demonstrate that the proposed control scheme effectively restores the voltage and frequency to the desired values and reduces the communication burden.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
