Article
Materials Science, Composites
Fusheng Wang, Xiangteng Ma, Zheng Wei, Yue Wu, Chenguang Huang
Summary: This article discusses the lightning damage mechanism of carbon fiber/epoxy composite materials and proposes numerical simulation methods to predict the thermal decomposition, ablation area, and depth of the composite laminate. The simulations are based on the multi-physics coupling effects and structural response analysis, and the results are verified through lightning tests.
COMPOSITES SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Wentao Wang, Longsheng Lu, Zehong Li, Yingxi Xie
Summary: This study investigates a method for preparing three-dimensional porous graphene through laser irradiation of polyimide films, and analyzes the in-situ growth mechanism and physical characteristics of the graphene. The 3D porous structure of graphene is attributed to micro-scale spatial effects, such as nucleation, growth, escape and explosion of bubbles in the air flow field.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Yaoxu Xiong, Jun Zhang, Shihua Ma, Shasha Huang, Biao Xu, Shijun Zhao
Summary: Multi-principal element alloys (MPEAs) have attracted attention for their exceptional mechanical properties and resistance to irradiation. This study combines molecular dynamics (MD) and cluster dynamics (CD) to model defect evolution in body-centered cubic (BCC) MPEAs, allowing for the analysis of factors affecting their irradiation performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Multidisciplinary Sciences
T. L. Yu, M. Xu, W. T. Yang, Y. H. Song, C. H. P. Wen, Q. Yao, X. Lou, T. Zhang, W. Li, X. Y. Wei, J. K. Bao, G. H. Cao, P. Dudin, J. D. Denlinger, V. N. Strocov, R. Peng, H. C. Xu, D. L. Feng
Summary: The interaction between antiferromagnetic magnons and electrons plays a crucial role in strongly correlated systems, directly influencing the band structure and properties of materials. The coupling constant of electron-antiferromagnetic magnon interactions can be significant, with strong dependence on doping and temperature. The colossal renormalization of electron bands by these interactions enhances the density of states at the Fermi energy, potentially leading to the emergence of new magnetic states in materials.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Soo-Ho Jo, Yong Chang Shin, Wonjae Choi, Heonjun Yoon, Byeng D. Youn, Miso Kim
Summary: This study investigates elastic wave localization in a phononic crystal with double defects by analyzing numerical and experimental results, revealing the mechanism of defect band splitting. Experimental results confirm that interaction between double defects leads to defect band splitting, and the degree of splitting is influenced by the inter-distance combinations of the defects.
Review
Green & Sustainable Science & Technology
Geng Chen, Lihua Tang, Brian Mace, Zhibin Yu
Summary: The latest developments in thermoacoustic devices have shown comparable power output and efficiency, higher reliability, and lower cost compared to conventional low-grade heat recovery technologies. Good coupling between multiple physical fields is crucial in realizing these potentials. This review provides a comprehensive analysis of the multi-physics coupling effects within thermoacoustic devices, offering insights into the underlying mechanisms and guidelines for improving modern thermoacoustic technologies.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Article
Chemistry, Physical
Adair Nicolson, Sean R. Kavanagh, Christopher N. Savory, Graeme W. Watson, David O. Scanlon
Summary: Copper-chalcogenides are prospective materials for thin film solar cells due to their desirable electronic properties and defect tolerance. In this study, we investigate the optoelectronic properties of Cu2SiSe3 and find that it exhibits a direct bandgap of 1.52 eV and a maximum efficiency of 30% for a 1.5 μm-thick film at the radiative limit. The formation energies of intrinsic defects are calculated, revealing that the dominant defect species is the p-type copper vacancy, which forms a perturbed host state. Overall, we propose further investigation of Cu2SiSe3 as a potential defect-tolerant photovoltaic absorber.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Physics, Multidisciplinary
Lu Wang, Uwe Niedermayer, Jingui Ma, Weihao Liu, Dongfang Zhang, Liejia Qian
Summary: Limited by acceleration synchronization difficulty, bridging the gap between non-relativistic and relativistic regimes has been a long-term challenge for on-chip dielectric laser-based accelerators. In this study, a laser-based accelerator scheme controlled by spatio-temporal coupling controlled laser pulses is proposed, allowing for acceleration of non-relativistic electrons to sub-MeV levels in a single acceleration structure. The scheme provides high precision temporal and spatial tuning of the driving laser and can potentially be extended to other wavelengths.
COMMUNICATIONS PHYSICS
(2022)
Article
Optics
Haitao Yue, Ning Lv, Chenguang Guo, Lijuan Zhao, Qiang Li, Jianzhuo Zhang, Yin Zhang
Summary: Experimental research on the microstructure evolution, defect characteristics, and suppression methods for multilayer cladding by laser melting deposition (LMD) was conducted. The results showed that selecting an appropriate laser energy density and preheating treatment can improve the forming quality and inhibit the formation of defects in multilayer cladding.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Yukihiko Takagaki, Michael Hanke, Manfred Ramsteiner
Summary: The study investigates the sulfurization of InP(111) surfaces using vaporized Sb2S3 and Bi2S3, exploring the effects of temperature on the substitution of atoms and epitaxial growth orientation. It reveals that the coverage with Sb and Bi changes the surface free energy, leading to alterations in growth orientation. Additionally, the deposition of polycrystalline Sb2S3 films is facilitated by the thermally activated sticking of Sb2S3 species to the InP surfaces.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Engineering, Mechanical
Wenyu Ding, Mingjun Chen, Jian Cheng, Henan Liu, Linjie Zhao, Hao Yang, Xumeng Cheng, Zhichao Liu, Qiao Xu, Chao Tan
Summary: A defect-induced laser damage explosion model was constructed to investigate the limitations of surface defects on the application of KDP optics in laser fusion facilities and to reveal the laser-induced damage mechanisms. The model successfully reproduced the dynamic damage process of protuberance defects on the KDP crystal surface and explained the characteristics of laser damage observed in experiments.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Mechanics
Kyuho Han, Sungkyun Oh, Hyungrok Do, Wontae Hwang
Summary: This study investigates the evolution of particle void region created by laser-induced breakdown in a particle-laden air flow using high-speed schlieren imaging and high-speed camera. The temporal and spatial characteristics of the void region and the factors controlling this phenomenon are discussed.
Article
Energy & Fuels
Youyang Wang, Liying Li, Yun Jia, Xiaobo Hu, Guoen Weng, Xianjia Luo, Shaoqiang Chen, Ziqiang Zhu, Junhao Chu, Hidefumi Akiyama
Summary: This study reveals, for the first time, the defect-induced current coupling phenomenon in an industry-standard InGaP/GaAs multi-junction solar cell through absolute EL imaging technique. By establishing models and conducting numerical simulations, and extracting relevant parameters, it is found that the phenomenon is attributed to the deterioration of weak-diode and shunt parameters at the GaAs bottom cell, resulting in a reduction in MJSC efficiency.
PROGRESS IN PHOTOVOLTAICS
(2022)
Article
Materials Science, Multidisciplinary
Kang Zhao, Yun Zhou, Shenghua Yin, Yajing Yan, Jun Wu, Hu Zhao, Shuo Wang
Summary: In this research, different contents of air-entraining agents were added during the fabrication process of cemented paste backfill to create various initial defects. The effects of these initial defects on CPB mechanics, energy dissipation, and microstructure were investigated using uniaxial compression, scanning electron microscopy, and nuclear magnetic resonance testing. The findings showed that the initial defects primarily consisted of microporosity and primary fractures, and the inclusion of air-entraining agents increased the presence of medium-sized and large-sized holes, reducing the microstructure density. Increasing initial defects resulted in decreased compressive strength and elastic modulus of the CPB and prolonged the compaction phase. Additionally, the energy storage and dissipation laws exhibited different patterns with the increase of initial defects.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Food Science & Technology
Tao Xu, Yihang Zhu, Xiaomin Zhang, Zheyuan Wu, Xiuqin Rao
Summary: This article proposes a dynamic prediction model for damage severity in apples and studies the relationship between the initial bruise form and impact energy distribution. The analysis provides a research concept and theoretical basis for future studies on morphological changes in damaged tissues of apples, improving the prediction accuracy of damage severity.
Article
Physics, Multidisciplinary
Chao Tan, Lin-Jie Zhao, Ming-Jun Chen, Jian Cheng, Zhao-Yang Yin, Qi Liu, Hao Yang, Wei Liao
Article
Engineering, Manufacturing
Linjie Zhao, Jian Cheng, Zhaoyang Yin, Hao Yang, Qi Liu, Chao Tan, Wei Liao, Mingjun Chen, Xiaodong Yuan
Summary: A rapid CO(2) laser processing technique was proposed for fabricating micro-optics and micro-structures on fused silica materials. The method achieves rapid prototyping and surface smoothing using high-power, short-pulse CO(2) laser, reducing processing complexity and cost while ensuring high precision and efficiency.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART B-JOURNAL OF ENGINEERING MANUFACTURE
(2022)
Article
Chemistry, Multidisciplinary
Hao Yang, Jian Cheng, Zhichao Liu, Qi Liu, Linjie Zhao, Chao Tan, Jian Wang, Mingjun Chen
Article
Engineering, Manufacturing
Qi Liu, Zhirong Liao, Dragos Axinte
INTERNATIONAL JOURNAL OF MACHINE TOOLS & MANUFACTURE
(2020)
Article
Optics
Hao Yang, Jian Cheng, Zhichao Liu, Qi Liu, Linjie Zhao, Chao Tan, Jian Wang, Mingjun Chen
Article
Materials Science, Multidisciplinary
Qi Liu, Zhirong Liao, Jian Cheng, Dongdong Xu, Mingjun Chen
Summary: This paper investigates the evolution of different cutting mechanisms with the change of uncut chip thickness (UCT) in KDP orthogonal cutting processes, and proposes a novel theoretical model to explain the cutting phenomena, which is well validated by the analysis of cutting forces and machined surface quality. However, three kinds of surface defects were observed, including micro pits, micro craters, and edge chipping.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Ceramics
Chao Tan, Linjie Zhao, Mingjun Chen, Jian Cheng, Zhaoyang Yin, Qi Liu, Hao Yang, Wei Liao
Summary: The intrinsic physical mechanism of CO2 laser rapid ablation mitigating micro-defects on fused silica optics surface was studied through experiments and simulations, analyzing the temperature distribution, heat affected zone, solid-liquid transition process, and surface morphology evolution under the action of moving pulsed laser. The study concluded that the periodic structural features at the bottom of surface morphology are formed by the super-position of residual height of linear laser processing.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Materials Science, Ceramics
Qi Liu, Mingjun Chen, Zhirong Liao, Junyuan Feng, Dongdong Xu, Jian Cheng
Summary: This study investigates the specific impact of temperature on the deformation behaviors of brittle KDP crystal through nano indentation/scratch methods. The results show that increasing the temperature significantly decreases the hardness and Elastic modulus of KDP crystal, while greatly increasing the fracture toughness, indicating a higher ability of ductile deformation at elevated temperature. Additionally, the scratch length in ductile removal process is extended more than 4 times by increasing temperature, and the quantity and size of brittle features show a reducing trend with temperature increase.
CERAMICS INTERNATIONAL
(2021)
Article
Optics
Chao Tan, Linjie Zhao, Mingjun Chen, Jian Cheng, Hao Yang, Qi Liu, Zhaoyang Yin, Wei Liao
Summary: Through numerical simulation and experimental research, the mechanism of surface morphology formation during CO2 pulsed laser processing of fused silica optics was comprehensively analyzed. It was found that the residual temperature between laser pulses was lower than the material's structural transition temperature, resulting in specific three-dimensional morphology features on the processed surface during laser scanning.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Optics
Hao Yang, Jian Cheng, Zhichao Liu, Qi Liu, Linjie Zhao, Chao Tan, Jian Wang, Mingjun Chen
Summary: The research showed that the repaired surface of KDP crystals can cause a large light field modulation near the rear KDP surface, with the modulation in the whole downstream light field being greater than that caused by amplitude change. Therefore, the phase characteristics of the outgoing light are suggested as a key focus for future research.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Chemistry, Physical
Hongqin Lei, Jian Cheng, Dinghuai Yang, Linjie Zhao, Mingjun Chen, Jinghe Wang, Qi Liu, Wenyu Ding, Guang Chen
Summary: When repairing and removing laser damage points on KDP crystal surfaces, various forms of micro-defects can affect the repair quality, which can be addressed by simulating the ball-end milling repair process.
Article
Chemistry, Physical
Rongkai Tan, Xuesen Zhao, Qi Liu, Xianmin Guo, Fengtao Lin, Liquan Yang, Tao Sun
Summary: In this study, ultrasonic elliptical vibration-assisted cutting (UEVC) technology was applied for the ultra-precision machining of selectively laser melted aluminum alloy. Experimental results showed that the conventional cutting process resulted in surface defects and deterioration with increasing cutting area, while the UEVC process achieved almost flawless machined surfaces. Additionally, the UEVC tool exhibited significantly less wear compared to the conventional cutting tool.
Article
Chemistry, Physical
Qi Liu, Jian Cheng, Zhirong Liao, Mingyu Liu, Mingjun Chen, Linjie Zhao, Hongqin Lei, Wenyu Ding
Summary: The repair of micro-defects on KH2PO4 (KDP) optic surfaces using micro-milling technique can introduce brittle cracks. Traditional surface roughness method fails to distinguish between ductile and brittle machining. Therefore, a new evaluation method using fractal dimension (F-D) was introduced to further characterize the surface morphologies of KDP crystals. The 3D and 2D F-Ds were calculated based on Box-counting method, and their correlations with surface roughness and anisotropy were analyzed. Fractal analysis facilitates the accurate and efficient evaluation of repaired KDP optics by micro-milling.
Article
Engineering, Electrical & Electronic
Linjie Zhao, Zhaoyang Yin, Dezhi Zhang, Jian Cheng, Hao Yang, Chao Tan, Qi Liu, Mingjun Chen, Xiaodong Yuan
Summary: A novel subpixel size calibration method based on regression model and Mie scattering theory was proposed to precisely calculate the actual sizes of tiny microtargets. The method showed significantly higher accuracy and smaller detection diameter compared to common pixel-level calibration methods.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2022)
Article
Engineering, Manufacturing
Lin-Jie Zhao, Jian Cheng, Ming-Jun Chen, Xiao-Dong Yuan, Wei Liao, Hao Yang, Qi Liu, Hai-Jun Wang
Summary: An integrated multi-station system has been designed to detect and mitigate surface damage on fused silica optics, utilizing UV laser conditioning and CO2 laser mitigation to enhance damage resistance and prolong service life of the optics. The system significantly saves installation time and improves positioning accuracy, demonstrating great significance for off-line detecting and mitigating surface damage in high power laser facilities.
INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING
(2021)