Article
Automation & Control Systems
Fangxin Chen, Yongzhuo Gao, Wei Dong, Zhijiang Du
Summary: This article presents a piezo-based passive compliant micro-gripper capable of combining position and force control. It utilizes a dual feedforward controller and a PID feedback controller for precision regulation, and experimental validation confirms the feasibility and stability of the system.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Chemistry, Analytical
Rodica-Cristina Voicu, Catalin Tibeica
Summary: This paper investigates an aluminum micro-tweezer for micromanipulation applications, including design, simulation, fabrication, characterizations, and experimental measurements. Electro-thermo-mechanical FEM-based simulations using COMSOL Multiphysics were conducted to describe the behavior of the micro-electro-mechanical system (MEMS) device. The micro-tweezers were fabricated in aluminum, as structural material, by surface micromachining processes. Experimental measurements were performed and compared with the simulation results. A micromanipulation experiment using titanium microbeads from 10-30 μm was conducted to confirm the performance of the micro-tweezer. This study further explores the use of aluminum as a structural material for MEMS devices intended for pick-and-place operations.
Article
Materials Science, Ceramics
Austin J. Martin, Wenbin Li, Jeremy Watts, Gregory E. Hilmas, Ming C. Leu, Tieshu Huang
Summary: Ceramic On-Demand Extrusion (CODE) is a direct ink writing process used to create dense ceramic components. However, these components often experience particle migration defects after printing. The reason for this defect was investigated using the coffee-ring effect and rheological methods, and modifications to the colloidal paste were explored to mitigate the issue.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Analytical
Jun -Ho Kim, Jaehwan Kim
Summary: With the increasing desire for biomimicry, electroactive artificial muscles are being utilized in various bioinspired applications. This study reports on the use of 3D dendritic nickel cobalt sulfide nanorods on graphene electrodes to achieve high-performance artificial muscles with stable electrochemical reactivity. The resulting muscles show significant enhancements in bending performance and stable response to input signals, enabling the development of bioinspired soft locomotive robots and expanding the soft electronics industry.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Instruments & Instrumentation
Jiawei Qian, Peng Yan, Pengbo Liu
Summary: The compliant micro-gripper actuated by a piezo has been developed with a new position/force model to describe its kineto-statics and dynamics, considering the impact of gripping objects on the gripper's dynamic properties for better predictability. Gripping experiments with different objects demonstrate the effectiveness and accuracy of the proposed modeling approach.
SMART MATERIALS AND STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
Xiang-hui Dai, Ke-hui Wang, Ming-rui Li, Jian Duan, Bing-wen Qian, Gang Zhou
Summary: This study investigated the penetration performance of elliptical cross-section ogive-nose projectiles (ECOPs) into concrete targets using a theoretical method. A general geometric model of ECOPs was introduced and penetration equations were derived based on the dynamic cavity-expansion theory. The model was validated by comparing predicted penetration depths with test data, and factors influencing the increment in penetration depth were examined.
DEFENCE TECHNOLOGY
(2021)
Article
Electrochemistry
Chen-Fei Zhao, Jun Wang, Zhuo-Qing Zhang, Zhao Sun, Zuliaya Maimaitimin
Summary: Nano-silver conductive inks have gained attention due to their high electrical conductivity, good chemical stability, and wide applicability. This study synthesized silver nanoparticles and used them with graphene or copper nanoparticles to prepare conductive inks suitable for micro-direct writing printing. The resulting paper electrodes showed high reproducibility and stability in electrochemical applications, and could be used for the analysis of potassium ferricyanide and potassium nitrate.
Article
Engineering, Electrical & Electronic
Qi Su, Jianhua Sun, Jie Deng, Xuefeng Ma, Weishan Chen, Yingxiang Liu
Summary: This paper proposes a novel two-degree-of-freedom micro scratching platform driven by an inchworm type piezoelectric actuator with parallel mechanisms, aiming to accomplish cross scale plane trajectory tracking. The platform can achieve decoupled motion and precise trajectory synthesis, as demonstrated by experimental results.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Engineering, Mechanical
Junwei Liu, Chuang Liu, Xianfeng Zhang, Pengcheng Li, Haiyang Wei, Wei Xiong, Mengting Tan
Summary: This paper conducted experiments to analyze the penetration characteristics of elliptical cross-section projectile (ECSP) into metal targets. The results showed that the penetration of ECSPs caused obvious asymmetry in the dynamic response and damage behavior of targets, and the ECSPs had larger crack length and quantity compared to circular cross-section projectiles (CCSPs). A theoretical model was also proposed to explain the asymmetric deformation and failure behavior of targets.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Ana Silvia Gonzalez, Javier Garcia, Victor Vega, Rafael Caballero Flores, Victor M. Prida
Summary: In this study, a novel 3D nanostructured silver electrode was designed and its chemical surface and electrochemical properties were investigated. The electrode exhibited high capacitance retention, Coulombic efficiency, and cycle stability, making it suitable for applications in micro-supercapacitors or electrochemical devices.
Article
Chemistry, Multidisciplinary
Qi Wang, Zhongxia Shang, Haiyan Wang, Alexander Wei
Summary: Colloidal Ag particles decorated with Fe3O4 islands can be activated as inverse catalysts for C(sp(2))-H heteroarylation either electrochemically or photochemically. The silver-iron oxide (SIO) particles are reduced into redox-active forms by cathodic charging at mild potentials or short-term light exposure, and can be reused multiple times by magnetic cycling without further activation. The reduction peak shift is attributed to the overpotential produced by surface Fe3O4, which separates residual Ag ions or clusters from bulk silver. The catalytic efficiency of SIO is maintained even with acid degradation, and can be counteracted by simple addition of water to the reaction medium.
Article
Multidisciplinary Sciences
Victory Armida Janine Jaques, Eva Zikmundova, Jiri Holas, Tomas Zikmund, Jozef Kaiser, Katarina Holcova
Summary: Scanning electron microscopy (SEM) is a commonly used method for analyzing painting micro-samples with high resolution and precise surface analysis. In this field, low-vacuum SEM (LV-SEM) is mostly used, and this work presents two conductive cross-section preparation methods for non-conductive samples to reduce charging effects without impairing sample integrity.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Civil
Chunyan Quan, Merih Kucukler
Summary: This paper investigates the structural behaviour and design of stainless steel circular hollow sections (CHS) and elliptical hollow sections (EHS) at elevated temperatures. Shell finite element models are created and validated against experimental results, generating benchmark structural performance data. Parametric studies are performed on different types of stainless steel CHS and EHS, considering various loading conditions and temperature levels. New design proposals for predicting the cross-section resistances of stainless steel CHS and EHS in fire are put forward, showing improved accuracy and safety compared to existing design provisions.
ENGINEERING STRUCTURES
(2023)
Article
Engineering, Electrical & Electronic
Hao Chen, Xin-jie Wang, Yun Cao, Jiong Wang, Zhan-wen Xi, Wei-rong Nie
Summary: A novel optimization method combining genetic algorithm, particle swarm optimization, and improved gradient descent algorithm is used for double-objective optimization of the U-shaped actuator. The optimized actuators show improved displacement and output force, with homologous size variables.
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Leitao Xu, Cairong Wang, Yelin Yao, Wei Chen, Zhonghuan Zhu, Jingcheng Wu, Ming Yang, Yandong Wu, Shuangyin Wang, Yuqin Zou
Summary: This study presents a salt-induced strategy for electro-oxidative cross-coupling of alcohols to synthesize α,β-unsaturated ketones in aqueous solutions. The strategy can inhibit over-oxidation of alcohols and promote the coupling reaction kinetics, leading to a high selectivity of 87%.
SCIENCE CHINA-CHEMISTRY
(2023)
Article
Engineering, Electrical & Electronic
Kehao Feng, Zhenghua Zhang, Guohua Bai, Xiuyuan Fan, Rongzhi Zhao, Xuefeng Zhang
Summary: This paper proposes a new method to accurately evaluate the high-frequency power loss of soft magnetic materials. Through a two-step calibration, the system is able to compensate for the phase angle discrepancy between the exciting current and induced voltage, enabling a higher power loss measurement frequency.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Mingfang Kang, Tong Liu, Hongmei Sun, Lin Li, Keliang Wang
Summary: In this study, the absorption performance of ambient nitrogenous toxic gases on a monolayer of blue phosphorus phase germanium selenide (GeSe) was investigated using density-functional theory calculations. The results showed that GeSe monolayer exhibits higher sensitivity and selectivity for the hazardous gas NO.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Yaqiong Niu, Zhicheng Zou, Longsheng Cheng, Chaofeng Ye
Summary: This paper proposes a novel method to stabilize the laser diode output using a close-loop control with two feedbacks. The proposed method performs better for long-time operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jiajie Li, Ying Liu, Zhen Chai, Qian Cao, Renjie Li, Yueyang Zhai
Summary: This study proposed an efficient and high-quality beam-splitting method based on a diffractive optical element, enabling multichannel SERF atomic magnetometers to achieve ultra-high consistency and sensitivity. It has significant applications in array biomagnetic measurement systems.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
E. Oliveira, C. Doering, H. Fouckhardt
Summary: With the development of Lab on a chip technology, fluid management using dispersed droplets has become an important approach. Electrowetting on dielectric (EWOD) is one method for droplet actuation, but it requires prior definition of droplet positions. Optoelectrowetting (OEW) goes further by allowing changes in electrical parameters through impinging light spots, without the need for predefined droplet positions. This study re-evaluates the key parameters of OEW and explores their effects on droplet actuation using numerical optimization methods.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Haipeng Wang, Zhiguo Wang, Gancheng Zhu, Shuai Zhang
Summary: A novel capacitive proximity skin was developed to improve the performance of robotics in handling liquid-filled containers. This skin features a flexible structure that can adapt to different grippers and seamlessly integrate with Robot Operating System. Experimental results demonstrated that this proximity skin achieved data-lossless detection and contactless measurement of liquid level, making it suitable for grasping operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Tsenguun Byambadorj, Xiangyu Zhao, Yutao Qin, Yogesh B. Gianchandani
Summary: In this research, a monolithically microfabricated Knudsen pump (KP) without suspended membranes was presented. These pumps offer improved mechanical robustness, wider process window, and simplified microfabrication process compared to previous designs. The experimental results matched the modeling results well, indicating the potential for monolithic integration onto complex lab-on-a-chip systems.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Hamed Karami, Saeed Karami Chemeh, Vahid Azizi, Hooman Sharifnasab, Jose Ramos, Mohammed Kamruzzaman
Summary: Aroma is a significant quality trait for pharmaceutical plants and their products, indicating the quality of the raw material. An electronic nose is an efficient approach for identifying and evaluating the aroma of essential oils. In this study, tarragon was dried at different temperatures and air velocities, and the purity of tarragon essential oil was evaluated using an electronic nose. Multivariate data analysis and artificial neural networks modeling were employed to quantify and classify the obtained essential oils.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Xiaoyang Duan, Dan Xu, Wenjun Jia, Ran Li, Bohao Sun, Ruitian Yan, Wenjie Zhao
Summary: Flower-like WO3/WS2 heterojunction materials constructed via a low-temperature in-situ oxidation method exhibit significant improvements in the detection of NO2 gas in gas sensors, along with good selectivity and reproducibility.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Peng Yu, Mengyang Zhang, Manqi You, Yuxi Gao, Landong Xiao, Yan Peng, Jingxia Lai, Zhouzhao Shi, Siwei Luo, Gencai Guo, Gang Guo
Summary: Recent studies have shown that two-dimensional Janus transition metal dichalcogenides (TMDs) have great potential for applications in gas sensors. By conducting first principles calculations, this study explores the potential application of Pd-doped monolayer HfSeS as gas sensor materials for detecting CO, CO2, NH3, and NO. The results demonstrate the good thermodynamical stability and reversible adsorption of these molecules on both pristine and Pd-doped HfSeS, with Pd-doped HfSeS showing higher sensitivity towards NO due to its metallic behavior upon NO adsorption.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jinlan Yang, Linjiao Li, Jun Huang, Quan Zhang, Hiba Affane
Summary: This study proposes a method for large-scale aggregation of micro-particles by creating a vortex region using low-frequency oscillation. Experimental results show that this method can achieve a large aggregation area and has the advantages of low cost and low power consumption.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jitendra Singh, Saurabh Kumar Gupta, Vinita
Summary: In this investigation, a Surface Acoustic Wave (SAW) formalin gas sensor was explored for low-level formalin gas sensing applications. The sensor showed stable response and high sensitivity to formalin gas concentration, making it a reliable and useful sensor for room temperature operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Junyao Wang, Yahao Liu, Huan Liu, Qi Hou, Jianxin Xu, Hongxu Pan, Jingran Quan, Yansong Chen, Hanbo Yang, Lixiang Li
Summary: A flexible electrode with a serpentine-shaped tetra-chiral structure was designed to improve the mechanical properties and prevent mechanical fracture of flexible electrodes. The research demonstrated that this structure reduced the maximum tensile stress by 87.19% compared to the existing tetra-chiral structure. The flexible electrode remained conductive even at a strain of 70% and showed resistance values of 5 ohm and 4.4 ohm at a bending angle of 180 degrees and after 1000 fold cycles. Furthermore, the flexible electrodes showed great potential in biological signal monitoring, particularly in collecting ECG and pulse signals.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Taihao Chen, Yong Fang, Mengru Zhu, Zhiwei Zhao, Wei Lei, Zhuoya Zhu, Helong Jiang
Summary: Flexible dual-spectral carbon nanodots/flexible n-silicon heterojunction photodetectors with high responsivity and detectivity are reported. These detectors show photo response in UV illumination and only in forward bias under visible illumination. The photocurrent of the device remains high even under bending strain.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
M. S. Sikandar Bathusha, Israr Ud Din, Rehan Umer, Kamran A. Khan
Summary: Graphene-based nanomaterials are used as embedded sensors to monitor fracture behavior in composite structures. This study investigates the in-situ crack propagation and fracture behavior in a glass fiber reinforced polymer composite using embedded reduced graphene oxide coated fabrics and highly conductive graphene nanoplatelet paper.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
