Article
Engineering, Multidisciplinary
C. Leone, E. Mingione, S. Genna
Summary: The study investigates laser cutting of Carbon Fibre Reinforced Plastics (CFRP) using high pulse power and short pulse duration, achieving cutting of 1.3 mm-thick sheets with narrow kerfs and limited Heat Affected Zone (HAZ).
COMPOSITES PART B-ENGINEERING
(2021)
Article
Polymer Science
Fathi Masoud, S. M. Sapuan, Mohd Khairol Anuar Mohd Ariffin, Y. Nukman, Emin Bayraktar
Summary: This study investigated the influence of different processing input parameters on the heat-affected zone (HAZ) of SPF-UPE composites cut with a CO2 laser. Results showed that minimizing laser power and maximizing traverse speed and gas pressure gave the optimum HAZ response. Gas pressure had the most significant effect on the HAZ, with its contribution decreasing as material thickness increased, while the contribution of traverse speed increased with material thickness.
Article
Optics
Wentai Ouyang, Junke Jiao, Zifa Xu, Hongbo Xia, Yiyun Ye, Qi Zou, Ruyu Tian, Liyuan Sheng
Summary: The picosecond laser double rotation cutting technique was used to machine holes on CFRP components, resulting in improved mechanical properties compared to traditional mechanical drilling methods. The machining process showed high precision without burrs or fractures, leading to enhanced tensile strength and fatigue performance of the CFRP samples.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Shaofu Huang, Zhendong Fu, Chao Liu, Changsong Wang
Summary: This study investigated the relationship between material ablation and heat affected zone (HAZ) during laser cutting of glass fiber reinforced polymer (GFRP). It was found that improving the ablation condition can help reduce the formation of HAZ.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Engineering, Civil
Xinghua Chen, Wenyuan Li, Youmin Rong, Guojun Zhang, Long Chen, Yu Huang
Summary: This paper presents an assisted laser cutting technology for carbon fiber reinforced polymer (CFRP) plate using dimethicone, which effectively reduces the heat-affected zone and improves the cutting quality. Through orthogonal experiments, the optimal cutting parameters were determined, resulting in a significant reduction (85.89%) in the heat-affected zone width.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2022)
Article
Engineering, Manufacturing
Wenyuan Li, Guojun Zhang, Yu Huang, Youmin Rong
Summary: The use of a 532 nm nanosecond fiber laser for CFRP plates drilling can achieve high-efficiency and high-quality results, adjusting the pulse duration can reduce the HAZ width and decrease drill hole taper, but it can also reduce drilling efficiency.
MATERIALS AND MANUFACTURING PROCESSES
(2021)
Article
Automation & Control Systems
Xiaobo Wang, Chaosheng Song, Lulu Li, Feng Jiao
Summary: This article analyzes the influence of fiber cutting angle on cutting force in carbon fiber-reinforced plastics (CFRP). A theoretical model is established for ultrasonic assisted cutting force, and experiments are conducted to compare it with normal cutting. The results show that ultrasonic assisted cutting can reduce cutting force, and the fiber cutting angle has a significant impact on tangential force.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Optics
Limei Chen, Maojun Li, Xujing Yang
Summary: This study proposed a newly designed fiber laser-CNC milling cooperative machining technique for slotting thick CFRP plates. The results showed that this technique can successfully cut CFRP plates without thermal damage, and the surface quality and morphology are good.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Biochemistry & Molecular Biology
Hao Jiang, Caiwen Ma, Ming Li, Zhiliang Cao
Summary: Ultrafast laser drilling has been proven to effectively reduce the heat-affected zone (HAZ) of carbon fiber-reinforced polymer (CFRP) composites. This study introduced the use of femtosecond laser to drill cylindrical holes in CFRP, and investigated the effects of laser power, rotational speed, and number of spiral passes on HAZ and ablation depth. Experimental results showed that a high-quality cylindrical hole of CFRP was obtained with a depth-to-diameter ratio of about 3:1 using femtosecond laser and a spiral drilling apparatus.
Article
Automation & Control Systems
Fuji Wang, Lelin Yang, Yue Li, Jun Deng, Yongquan Lin, Qingsong He, Rao Fu
Summary: This study established a planning method for selecting the cutting tool feed direction in the low-damage surface milling of CFRP components by considering the changes in the tool edge and fiber action form. The optimal cutting tool feed direction range was determined to be 0° to -40° relative to the fiber ply direction of the final cutting layer to reduce damage during surface milling.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Automation & Control Systems
ZiQiang Zhang, Feng Jiao, YuanXiao Li, Ying Niu, JingLin Tong
Summary: This paper investigates the machining performance of longitudinal-torsional ultrasonic-assisted core drilling in carbon fiber-reinforced plastics. The results show that this method significantly reduces cutting force, suppresses delamination, and improves hole quality.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Mechanics
L. Y. Xu, J. R. Lu, K. M. Li, J. Hu
Summary: This paper studied the effect of laser modification on the bonding strength of CFRP surfaces. Different laser treatment patterns were used to improve bonding strength. The highest bond strength was achieved with an annular pattern. The exposed continuity of carbon fibers and residual resin directly affected the bond strength. Additionally, the bond strength initially increased and then decreased with increasing scanning times, with the capillary effect of carbon fibers and air pressure in micro grooves playing a leading role.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Long Chen, Yu Huang, Wenyuan Li, Ranwu Yang, Xinhua Chen, Guojun Zhang, Youmin Rong
Summary: Acoustic emission (AE) technology is utilized to analyze the mechanism and evaluate the size of the heat-affected zone (HAZ) in laser cutting of carbon fiber-reinforced plastics (CFRP). The frequency distribution and root-mean-square (RMS) characteristics of AE signals provide valuable information about laser ablation and denudation.
COMPOSITE STRUCTURES
(2023)
Article
Automation & Control Systems
Xiaobo Wang, Chaosheng Song, Jinglin Tong, Lulu Li, Mingqiang Wu, Bo Zhao
Summary: This study investigates the influence of ultrasonic-assisted cutting on the surface quality of carbon fiber reinforced composites (CFRP). The simulation results demonstrate that ultrasonic reduces the damage degree of CFRP and that the tool attached torsional ultrasonic vibration is the most significant. Experimental results show that the introduction of ultrasonic changes the fracture mode of fiber and effectively reduces surface roughness. The fiber cutting angle and amplitude have a significant impact on the ultrasonic machining effect. The findings contribute to the high-quality processing of CFRP and other composite materials.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Chemistry, Physical
Haifeng Ning, Hualin Zheng, Guixin Wang
Summary: This study aims to investigate the material removal mechanism in the CFRP cutting process and establish an analytical model for cutting force. The experimental results show that the model is reliable and capable of providing accurate cutting force values.
Article
Engineering, Civil
Pengyong Miao, Hiroshi Yokota, Yafen Zhang
Summary: The present study utilizes the LSTM model to identify the relationships between bridge structural deterioration grades and potential influencing factors. Testing the model on a database of 3,368 bridges demonstrates that the LSTM model achieves an accuracy of over 80% in predicting bridge deterioration.
STRUCTURE AND INFRASTRUCTURE ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Ruiwang Zhang, Jianing Liang, Cheng Zeng, Jiajun Chen, Ying Ma, Tianyou Zhai, Huiqiao Li
Summary: This study investigates the degradation mechanism of Na0.7Ni0.35Sn0.65O2 upon air exposure and proposes a reheating recovery strategy. The results show that Na0.7Ni0.35Sn0.65O2 exhibits severe air sensitivity and transforms into its hydrated phase completely. Reheating under different conditions can restore its electrochemical properties and crystal structure by reinserting sodium ions extracted by H2O upon air exposure.
SCIENCE CHINA-MATERIALS
(2023)
Article
Biotechnology & Applied Microbiology
Wen-Yan Duan, Shuai-Bing Zhang, Yang-Yong Lv, Huan-Chen Zhai, Shan Wei, Ping-An Ma, Jing-Ping Cai, Yuan-Sen Hu
Summary: Fumigation with natural gaseous fungicides is a promising and sustainable approach to prevent fungal spoilage in postharvest grains. (E)-2-heptenal has shown strong antifungal activity against Aspergillus flavus by disrupting plasma membrane integrity and inducing oxidative stress.
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Ning Liu, Jiuren Zhou, Yupeng Yao, Siying Zheng, Wenjing Feng, Mengkuo Cui, Bochang Li, Yan Liu, Yue Hao, Genquan Han
Summary: We present a one-capacitor (1C) architecture HfO2-based ferroelectric optoelectronic memcapacitor (FOM), which integrates photoelectric perception and memory functions. By using a specially designed lightly doped semiconductor layer, the presence of photogenerated carriers allows non-volatile ferroelectric polarization switching under a certain positive pulse, enabling light perception and memory capabilities. Our HfO2-based FOMs exhibit a capacitance memory window of 5.0 fF/μm² and a high/low capacitance ratio of 41, which can be maintained for 4 x 10^9 s and endure 10^9 cycles stress. These easy-to-implement yet highly integrable and CMOS compatible 1C-FOMs open up promising opportunities for future edge computing and Internet of Things applications.
IEEE ELECTRON DEVICE LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Qiuhui Li, Chen Yang, Lin Xu, Shiqi Liu, Shibo Fang, Linqiang Xu, Jie Yang, Jiachen Ma, Ying Li, Baochun Wu, Ruge Quhe, Kechao Tang, Jing Lu
Summary: Through quantum transport simulations, researchers found that the performance gap between NMOS and PMOS can be eliminated in InAs nanowire transistors by using nanoscale gate-all-around structure, and further improvement of performance symmetry can be achieved through several strategies. Therefore, ultrasmall GAA InAs nanowire transistors have tremendous prospects in CMOS integrated circuits.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Orthopedics
Junqiao Li, Mingke You, Lei Yao, Weili Fu, Qi Li, Gang Chen, Xin Tang, Jian Li, Yan Xiong
Summary: Topical administration of TXA in knee arthroscopic arthrolysis can reduce postoperative blood loss and inflammatory response, alleviate early postoperative pain, increase early postoperative knee ROM, and improve early postoperative knee function without increased risks.
BMC MUSCULOSKELETAL DISORDERS
(2023)
Article
Mathematics, Interdisciplinary Applications
Caifeng Wang, Yukun Yang, Linlin Xu, Alexander Wong
Summary: This paper proposes a new model called PEEMD-QNN, which combines primary ensemble empirical mode decomposition with quantum neural network, for predicting stock index. Detailed experiments show that the PEEMD-QNN model has higher accuracy than other prediction models in stock market prediction.
FLUCTUATION AND NOISE LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Chengji Jin, Jiacheng Xu, Jiani Gu, Jiayi Zhao, Xiaole Jia, Jiajia Chen, Huan Liu, Miaomiao Zhang, Yue Peng, Bing Chen, Ran Cheng, Yan Liu, Xiao Yu, Genquan Han
Summary: We experimentally investigated the disturb-free operations of multilevel cell (MLC) ferroelectric field-effect transistors (FeFETs) in a NAND array. We characterized the fabricated FeFET cells and investigated optimized schemes for stable writing of FeFET cells into multiple states. We proposed write and read schemes to achieve stable MLC operations of FeFET NAND arrays. This work provides a fundamental understanding of disturb-free MLC FeFET operations for NAND applications.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Chemistry, Physical
Lei-Lei Li, Shuang-Shuang Chen, Shuang Liu, Zhi-Hua Yong, Da-Ke Zhang, Shuai-Shuai Zhang, Yi-Chen Xin
Summary: Two new lanthanide metal-organic frameworks (Ln-MOFs) with interesting magnetic properties were synthesized and characterized. The overall exchange couplings in both MOFs were found to be ferromagnetic. Compound 1 exhibited slow magnetic relaxation and Ising-like behavior due to the sufficient isolation of ferromagnetic coupled metal-carboxylate chains by long organic linkers.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Multidisciplinary
Pin-Tian Lyu, Xiao-Rui Liu, Li-Xin Yin, Pei Wu, Chao Sun, Hong-Yuan Chen, Jing-Juan Xu, Bin Kang
Summary: Understanding and managing hot electrons in metals play a vital role in plasmonic studies and applications. This study presents the ultrafast spatiotemporal evolution of hot electrons in plasmonic resonators, showing unique periodic distributions that can be adjusted by the resonator's size, shape, and dimension. Moreover, it reveals that the lifetimes of hot electrons are significantly prolonged at hot spots due to locally concentrated energy density. These findings are important for controlling the distributions and lifetimes of hot electrons, enabling targeted optoelectronic applications in plasmonic devices.
Article
Optics
Yudi Wu, Qiang Fu, Sijing Liang, Francesco Poletti, David J. Richardson, Lin Xu
Summary: We present a high-energy, picosecond, mid-infrared (MIR) optical parametric oscillator (OPO) that operates at a 1-MHz repetition rate in a compact cavity format using a length of hollow-core-fiber (HCF). The OPO is pumped by a ytterbium doped-fiber (YDF) master-oscillator-power-amplifier (MOPA) system and seeded by a 1040-nm gain-switched laser diode (GSLD). By utilizing periodically poled lithium niobate (PPLN) as the nonlinear crystal, the OPO generates tunable signal and idler beams with wavelengths ranging from 1329 to 1641 nm and 2841 to 4790 nm, respectively. The OPO produces 137-ps pulses with a maximum signal energy of 10.05 μJ at 1600 nm and a maximum idler energy of 5.13 μJ at 2967 nm. This represents the highest energy MIR pulses and the highest total converted pulse energy (15.18 μJ) ever achieved from a fiber laser-pumped picosecond OPO.
Article
Nanoscience & Nanotechnology
Ruiyun Zhang, Xuexin Duan, Shuaihua Zhang, Wenlan Guo, Chen Sun, Ziyu Han
Summary: Microfluidic phenotyping methods are essential for cellular characterization, specifically for evaluating single cells. A tunable microfluidic chip-based method was developed and tested to study the deformability of a single cell. By designing a pneumatic polymer polydimethylsiloxane (PDMS) membrane abutting a single-cell trapping structure, the cell can be controllably squeezed in a lateral direction. Computer vision was used to analyze and compare the degree of deformation of different types of single cells by recording the changes in cell contour under increasing pressure. This offers a new perspective for studying the mechanical properties of cells at the single cell level.
NANOTECHNOLOGY AND PRECISION ENGINEERING-NAMI JISHU YU JINGMI GONGCHENG
(2023)
Article
Materials Science, Multidisciplinary
Wei Li, Shiqiang Xie, Zhengyang Deng, Dongbo Zhou, Maojun Li, Xudong Guo, Wei Tang
Summary: This study proposes a mechanical and mechanochemical synergistic micro-grinding technology for efficient and high-quality grinding of hard and brittle materials, specifically fused silica micro parts. Compounded abrasive micro-grinding tools with diamond and cerium oxide abrasives are utilized to achieve initial grinding and subsequent ultra-precision processing for surface or subsurface damage removal. The study presents analysis on contact model, abrasive layer wear mechanism, formulation of cerium oxide abrasive layer, and material removal mechanisms during mechanochemical grinding. The results demonstrate high material removal rate and improved surface roughness, indicating the promising potential of this technique for grinding fused silica.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Pei-Pei Jia, Lianrui Hu, Wei-Tao Dou, Xing-Dong Xu, Haitao Sun, Zhi-Yong Peng, Dan-Yang Zhang, Hai-Bo Yang, Lin Xu
Summary: Efficient fabrication of artificial light-harvesting systems with cascade energy transfer properties was achieved through a coordination-driven self-assembly approach. Two different artificial light-harvesting systems with sequential energy transfer characteristics were efficiently prepared via supramolecular interactions. The critical factors affecting the light-harvesting efficiency were carefully analyzed and the results showed excellent energy transfer efficiency and high antenna effects.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Optics
Yazheng Hao, Rui Yang
Summary: We demonstrate the perfect synthesis of terahertz circularly polarized Fano resonant reflecting spectra from hybrid resonator-graphene meta-surfaces for highly sensitive refractive index sensing of the biochemical analyte. Such a hybrid resonator-graphene meta-surface, consisting of periodic multi-node split ring resonators on the top of the grounded polyimide substrate inserted with a monolayer graphene sheet, can perfectly transform the linearly polarized electromagnetic fields into circularly polarized waves. The proposed methodology, capable of distinguishing the samples with a difference in the refractive index of ten thousandths, should pave the way for tangible applications of precision detections in biochemical assays with high accuracy.
