期刊：
European Journal of Mechanics - A/Solids,2026年115:105822 ISSN：0997-7538
通讯作者：
Jiu-Jiu Chen
作者机构：
[Shao-Yong Huo; Qiu-Shuang Yang; Zhi-Peng Jin; Shu-xin Zhang; Chun-Ming Fu] College of Mechanical Engineering, University of South China, Hengyang, 421001, China;[Jiu-Jiu Chen] State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha, 410082, China;[Rong-hua Chen] School of Aeronautics and Mechanical Engineering, Jiangsu College Key Laboratory of Non-Traditional Machining, Changzhou Institute of Technology, Changzhou, Jiangsu, 213032, China
通讯机构：
[Jiu-Jiu Chen] S;State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha, 410082, China
摘要：
Manipulation of elastic waves to achieve rainbow trapping effect has attracted wide attention. However, most of the current researches achieve rainbow trapping effect by changing the structural parameters, which means that the structure and mechanical properties are always fixed. Realizing the actively tunable working frequency range in elastic topological systems and obtain multi-dimensional rainbow trapping is still a challenge. In this paper, we design a topologically protected second-order thermostatic phononic crystal (PC) plate by using ferroelectric ceramic materials. By adjusting the rotation angle of the T-shaped scatterer, we can realize the multi-dimensional topological phase transition between the bulk and edge bands of elastic wave. Then, a “trivial-nontrivial-trivial” (TNT) heterostructure is constructed to obtain the coupled topological edge states of elastic wave, and the influence of intermediate coupling layer number on the edge states is investigated, which exhibits a multi-mode interference effect. Furthermore, the tunable topological edge states and corner states of elastic wave are obtained based on the temperature control of the ferroelectric materials. In addition, by employing the active tunability of the coupled edge states and corner states, the multi-dimensional topological rainbow trapping of elastic wave in ferroelectric PC plates is demonstrated. The edge and corner states of different frequencies are well separated and captured in different spatial positions, and the working frequency range of the PC plate can be easily tuned by controlling the temperature. Our results further promote the practical integration application of tunable and multi-dimensional elastic wave devices.
Manipulation of elastic waves to achieve rainbow trapping effect has attracted wide attention. However, most of the current researches achieve rainbow trapping effect by changing the structural parameters, which means that the structure and mechanical properties are always fixed. Realizing the actively tunable working frequency range in elastic topological systems and obtain multi-dimensional rainbow trapping is still a challenge. In this paper, we design a topologically protected second-order thermostatic phononic crystal (PC) plate by using ferroelectric ceramic materials. By adjusting the rotation angle of the T-shaped scatterer, we can realize the multi-dimensional topological phase transition between the bulk and edge bands of elastic wave. Then, a “trivial-nontrivial-trivial” (TNT) heterostructure is constructed to obtain the coupled topological edge states of elastic wave, and the influence of intermediate coupling layer number on the edge states is investigated, which exhibits a multi-mode interference effect. Furthermore, the tunable topological edge states and corner states of elastic wave are obtained based on the temperature control of the ferroelectric materials. In addition, by employing the active tunability of the coupled edge states and corner states, the multi-dimensional topological rainbow trapping of elastic wave in ferroelectric PC plates is demonstrated. The edge and corner states of different frequencies are well separated and captured in different spatial positions, and the working frequency range of the PC plate can be easily tuned by controlling the temperature. Our results further promote the practical integration application of tunable and multi-dimensional elastic wave devices.
摘要：
Laser cladding rapid solidification technique is an effective strategy for manufacturing ultra-high-strength martensitic stainless steels (UHS-MSS). Due to super-saturation solution strengthening of interstitial atoms (IAs), martensitic stainless steels containing IAs exhibit excellent ultra-high strength and toughness and have high tolerance for oxygen impurities. Hence, studying the specific speciation and structural characteristics of IAs is of great significance for guiding laser cladding of ultra-high-strength steels. Herein, we use density functional theory (DFT) computations to analyze the stable occupancies of IAs and their interactions in body-centered cubic iron (BCC Fe). The findings show that single IAs prefer to occupy octahedral sites over tetrahedral sites. Therefore, octahedral sites are selected as the optimal sites for the following double IAs study. For homo IAs, C-C and N-N configurations exhibit greater stability at long-range distances, whereas O-O demonstrate optimal stability at intermediate distances. Crucially, hetero IAs configurations are more stable compared to single IAs and homo IAs, exhibiting a synergistic effect. Especially, the C-O combination shows the highest stability and strongest bonding character. Meanwhile, the dissociation behavior of O indicates that C-O and N-O have higher dissociation temperatures than single O, further verifying the synergistic effect of hetero IAs. This provides a theoretical basis for understanding the interstitial solution strengthening of laser cladding UHS-MSS.
摘要：
The accurate prediction of failure boundaries in engineering applications is essential for ensuring safety and reliability. Traditional methods often rely heavily on high-fidelity physical experiments or numerical simulations, which are prohibitively expensive and time-consuming. In response to this challenge, our research proposes an innovative multi-fidelity support vector classification approach that leverages an abundant supply of low-fidelity data alongside a limited amount of high-fidelity data. This combination significantly reduces modeling costs while maintaining or even enhancing predictive accuracy. The key points of the proposed method include the design of a reasonable kernel function to effectively describe the relationship between the input and output of multiple fidelities, and the determination of the optimal hyperparameters. In addition, in practical engineering problems, real data often exhibit data imbalance, leading to poor performance of the trained models. Our novel method addresses this limitation by integrating a strategy for managing the data imbalance. By effectively treating data imbalance, our approach significantly improves the classification and boundary prediction capabilities of the model. To validate our method, we applied it to three distinct engineering problems: predicting the failure boundary of a zero Poisson ratio structure, analyzing surge and choke boundaries in an axial flow compressor rotor, and tackling a 31-dimensional simulation failure boundary prediction problem within the computational fluid dynamics context of the same rotor. The results demonstrate that our multi-fidelity support vector classification method not only effectively predicts boundaries in these practical scenarios but also outperforms alternative methods, showing its potential as a powerful tool for engineers.
关键词：
Uranium reduction;Cobalt oxides;Oxygen vacancies;Recovery of uranium;Radioactive wastewater
摘要：
As the primary uranium species in aquatic systems, uranyl ions (UO 2 2+ ) readily form stable coordination complexes with organic contaminants, severely compromising the recovery and utilization of uranium. To address this challenge, we developed a novel photoelectrochemical (PEC) system featuring oxygen-vacancy-enriched cobalt oxide-modified carbon felt (OvCoO x /CF) as a functional cathode. In this PEC system, the photoanode is photoexcited to generate holes (h + ) and hydroxyl radicals (•OH) efficiently decomposing organic substances, thereby releasing uranium from complexes. Concurrently, photogenerated electrons migrate through the external circuit to the OvCoO x /CF cathode, where they reduce and fix the released UO 2 2+ into stable uranium compounds while simultaneously generating electrical output. This synergistic mechanism enables the system to achieve remarkable enhancements in contaminant removal efficiency, with substantial increases in rate constants ( k ) for both uranium reduction and organic degradation. The exceptional uranium extraction performance is primarily attributed to abundant active sites, the lower adsorption energy of UO 2 2+ , and the rapid electron transfer channel introduced by the incorporation of Ov. Notably, the PEC system maintains high efficiency across diverse conditions, including pH fluctuations, high salinity and various organic contaminant species and concentrations. Furthermore, its operational robustness extends to challenging environments such as polluted seawater and natural sunlight exposure. This work establishes a sustainable paradigm for radioactive wastewater remediation, integrating efficient uranium extraction with organic pollutant elimination and in situ electricity generation, offering a transformative solution for nuclear resource recovery and environmental protection.
As the primary uranium species in aquatic systems, uranyl ions (UO 2 2+ ) readily form stable coordination complexes with organic contaminants, severely compromising the recovery and utilization of uranium. To address this challenge, we developed a novel photoelectrochemical (PEC) system featuring oxygen-vacancy-enriched cobalt oxide-modified carbon felt (OvCoO x /CF) as a functional cathode. In this PEC system, the photoanode is photoexcited to generate holes (h + ) and hydroxyl radicals (•OH) efficiently decomposing organic substances, thereby releasing uranium from complexes. Concurrently, photogenerated electrons migrate through the external circuit to the OvCoO x /CF cathode, where they reduce and fix the released UO 2 2+ into stable uranium compounds while simultaneously generating electrical output. This synergistic mechanism enables the system to achieve remarkable enhancements in contaminant removal efficiency, with substantial increases in rate constants ( k ) for both uranium reduction and organic degradation. The exceptional uranium extraction performance is primarily attributed to abundant active sites, the lower adsorption energy of UO 2 2+ , and the rapid electron transfer channel introduced by the incorporation of Ov. Notably, the PEC system maintains high efficiency across diverse conditions, including pH fluctuations, high salinity and various organic contaminant species and concentrations. Furthermore, its operational robustness extends to challenging environments such as polluted seawater and natural sunlight exposure. This work establishes a sustainable paradigm for radioactive wastewater remediation, integrating efficient uranium extraction with organic pollutant elimination and in situ electricity generation, offering a transformative solution for nuclear resource recovery and environmental protection.
作者机构：
[Fan, Jiafeng; Jian, Wenjie; Li, Xiaoqiang; Jiang, Qi; Zhang, Haoxi; Li, XQ; Tu, Penghui; Yang, Chao; Qu, Shengguan] South China Univ Technol, Natl Engn Res Ctr Near Net Shape Forming Met Mat, Guangdong Key Lab Adv Met Mat Fabricat & Forming, Guangzhou 510640, Peoples R China.;[Pan, Cunliang] Univ South China, Sch Mech Engn, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Li, XQ ] S;South China Univ Technol, Natl Engn Res Ctr Near Net Shape Forming Met Mat, Guangdong Key Lab Adv Met Mat Fabricat & Forming, Guangzhou 510640, Peoples R China.
摘要：
Reliable joining of TiAl and Ti 2 AlNb alloys, pivotal for high-temperature aerospace applications, remains challenging due to their structural and chemical disparities, which often result in brittle interfacial phases and degraded mechanical performance. This study introduces a synergistically engineered Ti-based interlayer for pulsed-current diffusion bonding (PCDB), enabling high-strength joints with exceptional stability across ambient and elevated temperatures. The interlayer, featuring a metastable β matrix and multi-element solid solution, which promotes the formation of a gradient interfacial structure: a dual-phase α 2 + B2 layer and a single phase α 2 layer on the TiAl side, and a B2-dominant structure on the Ti 2 AlNb side. Optimal bonding at 900 °C yields uniform diffusion layers, balancing elemental interdiffusion and microstructural stability to achieve peak tensile strengths of 684.1 MPa at room temperature (fracturing in the TiAl substrate) and 587.9 MPa at 700 °C—surpassing conventional interlayer-based joints. Strengthening arises from synergies between solid-solution, intracrystalline defects (dislocation walls and nanotwins), and gradient interfacial structures, demonstrating a breakthrough in joining dissimilar Ti Al intermetallics for high-performance engineering applications.
Reliable joining of TiAl and Ti 2 AlNb alloys, pivotal for high-temperature aerospace applications, remains challenging due to their structural and chemical disparities, which often result in brittle interfacial phases and degraded mechanical performance. This study introduces a synergistically engineered Ti-based interlayer for pulsed-current diffusion bonding (PCDB), enabling high-strength joints with exceptional stability across ambient and elevated temperatures. The interlayer, featuring a metastable β matrix and multi-element solid solution, which promotes the formation of a gradient interfacial structure: a dual-phase α 2 + B2 layer and a single phase α 2 layer on the TiAl side, and a B2-dominant structure on the Ti 2 AlNb side. Optimal bonding at 900 °C yields uniform diffusion layers, balancing elemental interdiffusion and microstructural stability to achieve peak tensile strengths of 684.1 MPa at room temperature (fracturing in the TiAl substrate) and 587.9 MPa at 700 °C—surpassing conventional interlayer-based joints. Strengthening arises from synergies between solid-solution, intracrystalline defects (dislocation walls and nanotwins), and gradient interfacial structures, demonstrating a breakthrough in joining dissimilar Ti Al intermetallics for high-performance engineering applications.
期刊：
Particulate Science and Technology,2025年43(4):637-650 ISSN：0272-6351
通讯作者：
Deng, R
作者机构：
[Deng, Rong; Luo, Yufeng; Deng, R] Univ South China, Sch Mech Engn, Hengyang 421000, Hunan, Peoples R China.;[Li, Sizhong] Hunan Hergelix intelligent Technol Co LTD, Shachang, Hunan, Peoples R China.
通讯机构：
[Deng, R ] U;Univ South China, Sch Mech Engn, Hengyang 421000, Hunan, Peoples R China.
关键词：
Fresh concrete;DEM;B m;shape and content of coarse aggregate;specific surface area
摘要：
In this paper, the effect of the coarse aggregate (CA) shape and content on the flow performance index of fresh concrete in the L-box test (B m ) was investigated based on Discrete Element Method (DEM). The Hertz-Mindlin-JKR (Johnson-Kendall-Roberts) contact model was used to characterize the constitutive relationships of fresh concrete. The parameters of contact model were calibrated by the experiment and simulation of the slump test, L-box flow test and V-funnel test. The shape of CA was quantitatively characterized, and a functional relationship between the specific surface area of concrete (S C ) and surface energy was established. The effect of CA shape and content on B m was studied numerically. The simulated results of single-shape CA concrete in L-box test show that the shape of CA affects the resultant force and flow velocity of the tracked concrete in the x direction, thus affecting the B m . The smaller the sphericity index of CA, the larger the specific surface area and the smaller the B m . The results of orthogonal tests show that the CA content of different shape in concrete affects B m with different degree. The larger the specific surface area of coarse aggregate (S CA ), the greater the negative effect on B m . A linear relationship between S C and B m was established. An equation for predicting B m based on shapes and contents of CA was presented. It shows that the more complex the shape of CA and the higher its content, the smaller the B m .
摘要：
With the rapid development of flexible wearable electronic products, their application fields and demands are increasing, posing new challenges to flexible conductive materials. This paper selected flexible polydimethylsiloxane (PDMS) as the substrate. In order to enhance the adhesion between the substrate and the metal coating, dopamine and silanization were used to co-modify its surface. A conductive layer of metallic copper is deposited on its surface using an inexpensive, easy-to-use electroless plating technique. By optimizing the process conditions, it is found that a uniform copper layer of about 0.6 μm can be formed on the surface of the substrate by electroless plating at a constant temperature of 45°C for 30 min with a conductivity of 5556 S/cm. The relative resistance changes under different deformation conditions, and the I-V curve of the LED circuit is not very different. Therefore, this paper prepared a flexible conductor with excellent electrical conductivity, high coating adhesion, and good electrical stability under large-scale deformation.
With the rapid development of flexible wearable electronic products, their application fields and demands are increasing, posing new challenges to flexible conductive materials. This paper selected flexible polydimethylsiloxane (PDMS) as the substrate. In order to enhance the adhesion between the substrate and the metal coating, dopamine and silanization were used to co-modify its surface. A conductive layer of metallic copper is deposited on its surface using an inexpensive, easy-to-use electroless plating technique. By optimizing the process conditions, it is found that a uniform copper layer of about 0.6 μm can be formed on the surface of the substrate by electroless plating at a constant temperature of 45°C for 30 min with a conductivity of 5556 S/cm. The relative resistance changes under different deformation conditions, and the I-V curve of the LED circuit is not very different. Therefore, this paper prepared a flexible conductor with excellent electrical conductivity, high coating adhesion, and good electrical stability under large-scale deformation.
期刊：
Journal of Nuclear Materials,2025年:156124 ISSN：0022-3115
通讯作者：
Jieheng Lei
作者机构：
Hunan Provincial Engineering Research Center for Nuclear Contaminated Metal Recycling and Uranium Recovery Equipment, University of South China, Hengyang, Hunan, 421001, China;[Jieheng Lei] School of Mechanical Engineering, University of South China, Hengyang, Hunan, 421001, China;[Jian Deng; Guolong Wang; Xiaochen Lv; Qiuyang Du; Shiyu Tan; Zeyong Lei] Hunan Provincial Engineering Research Center for Nuclear Contaminated Metal Recycling and Uranium Recovery Equipment, University of South China, Hengyang, Hunan, 421001, China<&wdkj&>School of Mechanical Engineering, University of South China, Hengyang, Hunan, 421001, China
通讯机构：
[Jieheng Lei] S;School of Mechanical Engineering, University of South China, Hengyang, Hunan, 421001, China
摘要：
Radioactive corrosion products, specifically 58 Co and 60 Co, accumulate on the surface of components in pressurized water reactors (PWRs), posing significant challenges to nuclear plant safety. In this study, the microstructure and chemical composition of the surface layer of 304 stainless steel (304SS) exposed to cobalt-containing boron/lithium water at a high temperature of 573 K for 5, 10, 15, 20, and 25 days were investigated. The cobalt deposition behaviour and mechanisms were analysed via material characterization techniques, E–pH diagrams, Gibbs free energy calculations, and analysis of the preference energies of metal cations in crystallographic structures. The results revealed that after 15 days of soaking, three distinct cobalt deposition layers formed on the 304SS surface. The outer layer (∼65 nm) consisted of Co 3 O 4 , the middle layer (∼16 nm) consisted of CoFe 2 O 4 , and the inner layer (∼4 nm) consisted of CoCr 2 O 4 . The composition of these layers was relatively independent of the soaking time. CoCr 2 O 4 primarily formed through migration of Co 2+ from solution, coprecipitation with dissolved Cr 3+ from the specimen surface or ion exchange with FeCr 2 O 4 and NiCr 2 O 4 . CoFe 2 O 4 formed through coprecipitation with dissolved Fe 3+ or ion exchange with NiFe 2 O 4 and Fe 3 O 4 . Co 3 O 4 was derived from oxidative decomposition of Co(OH) 2 at high temperatures. This study provides key insights into the formation mechanisms of cobalt deposition layers on 304SS in PWRs and provides a theoretical reference for optimization of primary water chemical environmental parameters, improvement of structural materials, and selection of decontamination methods during operation or decommissioning.
Radioactive corrosion products, specifically 58 Co and 60 Co, accumulate on the surface of components in pressurized water reactors (PWRs), posing significant challenges to nuclear plant safety. In this study, the microstructure and chemical composition of the surface layer of 304 stainless steel (304SS) exposed to cobalt-containing boron/lithium water at a high temperature of 573 K for 5, 10, 15, 20, and 25 days were investigated. The cobalt deposition behaviour and mechanisms were analysed via material characterization techniques, E–pH diagrams, Gibbs free energy calculations, and analysis of the preference energies of metal cations in crystallographic structures. The results revealed that after 15 days of soaking, three distinct cobalt deposition layers formed on the 304SS surface. The outer layer (∼65 nm) consisted of Co 3 O 4 , the middle layer (∼16 nm) consisted of CoFe 2 O 4 , and the inner layer (∼4 nm) consisted of CoCr 2 O 4 . The composition of these layers was relatively independent of the soaking time. CoCr 2 O 4 primarily formed through migration of Co 2+ from solution, coprecipitation with dissolved Cr 3+ from the specimen surface or ion exchange with FeCr 2 O 4 and NiCr 2 O 4 . CoFe 2 O 4 formed through coprecipitation with dissolved Fe 3+ or ion exchange with NiFe 2 O 4 and Fe 3 O 4 . Co 3 O 4 was derived from oxidative decomposition of Co(OH) 2 at high temperatures. This study provides key insights into the formation mechanisms of cobalt deposition layers on 304SS in PWRs and provides a theoretical reference for optimization of primary water chemical environmental parameters, improvement of structural materials, and selection of decontamination methods during operation or decommissioning.
摘要：
Cicada wing exhibiting a high transparency at wide viewing angles can be bioinspired for the formation of antireflective subwavelength array (ASA), which can effectively enhance surface transmittance of infrared window for infrared detection. Due to extreme fine structure of the ASA and significant limitations of single pulse Gaussian beam manufacturing accuracy, it still a challenge to fabricate ASA with broadband and mechanically-durable properties by femtosecond laser. In this study, a novel temporal-spatial shaping femtosecond laser micromachining is proposed to fabricate inverted cone pattern ASA on zinc sulfide (ZnS) substrate for suppressing surface Fresnel reflection and realizing high infrared transmittance. Femtosecond laser double-pulse Bessel beam is used to experimentally fabricate the ASA with tunable depth and width by laser power and pulse delay. The bioinspired ASA is manufactured on ZnS, achieving high transmittance of 88 % in the wavelength of 4–12 μm, good laser damage resistance with ablation threshold of 0.24 J/cm 2 , and preferable hydrophobicity with water contact angle of 150°. Finally, the infrared detection measurements through the optical window express that the ASA on the ZnS window effectively improves the target details well and suppresses the background noise of the captured infrared image.
Cicada wing exhibiting a high transparency at wide viewing angles can be bioinspired for the formation of antireflective subwavelength array (ASA), which can effectively enhance surface transmittance of infrared window for infrared detection. Due to extreme fine structure of the ASA and significant limitations of single pulse Gaussian beam manufacturing accuracy, it still a challenge to fabricate ASA with broadband and mechanically-durable properties by femtosecond laser. In this study, a novel temporal-spatial shaping femtosecond laser micromachining is proposed to fabricate inverted cone pattern ASA on zinc sulfide (ZnS) substrate for suppressing surface Fresnel reflection and realizing high infrared transmittance. Femtosecond laser double-pulse Bessel beam is used to experimentally fabricate the ASA with tunable depth and width by laser power and pulse delay. The bioinspired ASA is manufactured on ZnS, achieving high transmittance of 88 % in the wavelength of 4–12 μm, good laser damage resistance with ablation threshold of 0.24 J/cm 2 , and preferable hydrophobicity with water contact angle of 150°. Finally, the infrared detection measurements through the optical window express that the ASA on the ZnS window effectively improves the target details well and suppresses the background noise of the captured infrared image.
摘要：
To address the issue of low intersection efficiency in curved surface slicing of an STL model in additive manufacturing, this study proposes a novel curved surface slicing algorithm that integrates inner and outer bounding boxes with a projection-based approach. The proposed methodology is outlined as follows: Firstly, during the intersection process between the curved surface layer and the model, oriented bounding boxes (OBBs) are constructed for both the curved surface layer and the model to identify the intersecting regions, and the triangles located within the intersecting regions are selected. Secondly, the inner bounding boxes are constructed within the curved surface layer, the triangles located within the intersecting regions of the model and the inner bounding boxes are then projected onto the XOZ and YOZ planes, and the triangles of the model that do not intersect with the curved surface layer are effectively removed by Boolean operations. Finally, after two rounds of screening, an axis-aligned bounding box (AABB) is constructed for both the remaining triangles of the model and the triangles of the curved surface layer within the intersecting region, the intersection calculations are then performed on the triangles that are likely to intersect. The algorithm is applied to the STL model of impeller blades, and the results demonstrate significant improvements in computational efficiency. Specifically, the time complexity of the proposed algorithm is approximately 37 % of that of the brute-force intersection algorithm and 77 % of the hierarchical bounding box algorithm. Furthermore, the running time is reduced to 18.6 % of that of the brute-force intersection algorithm and 47.6 % of the hierarchical bounding box algorithm. These results substantiate the feasibility and efficiency of the proposed algorithm in enhancing intersection calculations in additive manufacturing processes.
To address the issue of low intersection efficiency in curved surface slicing of an STL model in additive manufacturing, this study proposes a novel curved surface slicing algorithm that integrates inner and outer bounding boxes with a projection-based approach. The proposed methodology is outlined as follows: Firstly, during the intersection process between the curved surface layer and the model, oriented bounding boxes (OBBs) are constructed for both the curved surface layer and the model to identify the intersecting regions, and the triangles located within the intersecting regions are selected. Secondly, the inner bounding boxes are constructed within the curved surface layer, the triangles located within the intersecting regions of the model and the inner bounding boxes are then projected onto the XOZ and YOZ planes, and the triangles of the model that do not intersect with the curved surface layer are effectively removed by Boolean operations. Finally, after two rounds of screening, an axis-aligned bounding box (AABB) is constructed for both the remaining triangles of the model and the triangles of the curved surface layer within the intersecting region, the intersection calculations are then performed on the triangles that are likely to intersect. The algorithm is applied to the STL model of impeller blades, and the results demonstrate significant improvements in computational efficiency. Specifically, the time complexity of the proposed algorithm is approximately 37 % of that of the brute-force intersection algorithm and 77 % of the hierarchical bounding box algorithm. Furthermore, the running time is reduced to 18.6 % of that of the brute-force intersection algorithm and 47.6 % of the hierarchical bounding box algorithm. These results substantiate the feasibility and efficiency of the proposed algorithm in enhancing intersection calculations in additive manufacturing processes.
摘要：
Specifically exposed planes could play a crucial role in the chemical activity of nanomaterials. The morphology and structure of nano-structured WO3 particles with {020} exposure planes were successfully controlled via hydrothermal synthesis technology by adjusting the synthesis temperature and time. Additionally, the gas-sensing properties of sensors fabricated using these WO3 particles were investigated to detect different volatile gases. All the samples were found to be sensitive to alcohol gas, and the WO3 nanoparticles synthesized at 150 °C for 12 h exhibited excellent gas-sensing properties, which shows that these WO3 nanoparticles can act as an efficient gas-sensing material for the one-site selective detection of ethanol.
Specifically exposed planes could play a crucial role in the chemical activity of nanomaterials. The morphology and structure of nano-structured WO3 particles with {020} exposure planes were successfully controlled via hydrothermal synthesis technology by adjusting the synthesis temperature and time. Additionally, the gas-sensing properties of sensors fabricated using these WO3 particles were investigated to detect different volatile gases. All the samples were found to be sensitive to alcohol gas, and the WO3 nanoparticles synthesized at 150 °C for 12 h exhibited excellent gas-sensing properties, which shows that these WO3 nanoparticles can act as an efficient gas-sensing material for the one-site selective detection of ethanol.
通讯机构：
[Qu, W ] U;Univ South China, Sch Mech Engn, Hengyang, Peoples R China.
关键词：
Axial force;temperature variation;Galerkin-eigenvalue method;eigenvalue method;natural frequency
摘要：
This paper examines the effects of axial force and temperature changes on the dynamic characteristics of pipes. The Galerkin method, combined with the eigenvalue method, is employed to solve the fluid-structure interaction (FSI) motion equations for the pipe. The study investigates the impact of axial force, temperature changes, fluid velocity, fluid pressure, and pipe structure parameters on the pipe's natural frequency. Numerical results reveal that different parameters have varying effects on the pipe's natural frequency, leading to the determination of stability conditions' varying influences. Combined with the finite element method (FEM), the impact of temperature changes on the pipe's natural frequency is analyzed. The correctness of the numerical results of the Galerkin-eigenvalue method was verified through comparative methods. The research results confirm that this numerical method provides strong theoretical support for analyzing the nonlinear dynamic characteristics of pipelines under temperature changes in random vibration environments. This is of guiding significance to the vibration reduction design of the pipeline system and helps prevent and reduce the structural damage and accident risks caused by the change in the pipeline's dynamic characteristics.
通讯作者：
Zhenye Li<&wdkj&>Deqian Zeng<&wdkj&>Hanjian Lai
作者机构：
[Deqian Zeng] School of Nuclear Science and Technology, University of South China, Hengyang, 421001 China;[Hanjian Lai] School of Electrical Engineering, University of South China, Hengyang, 421001 China;[Zhenye Li; Rujin Zhou; Zhaoxiong Su; Min Mao; Zhijun Li] College of Mechanical Engineering, University of South China, Hengyang, 421001 China;[Chunguang Zhu] School of Materials Science and Engineering, Sichuan University of Science & Engineering, Zigong, Sichuan, 643002 China
通讯机构：
[Zhenye Li] C;[Deqian Zeng; Hanjian Lai] S;School of Nuclear Science and Technology, University of South China, Hengyang, 421001 China<&wdkj&>School of Electrical Engineering, University of South China, Hengyang, 421001 China<&wdkj&>College of Mechanical Engineering, University of South China, Hengyang, 421001 China
摘要：
Industrial-scale roll-to-roll processing of organic photovoltaics (OPVs) requires photoactive layers ≥300 nm for manufacturability and mechanical robustness, yet state-of-the-art high-efficiency systems remain confined to 80-120 nm due to intrinsic exciton diffusion and charge transport limitations. To resolve this fundamental thickness-efficiency trade-off, monolayer MnPS(3) nanosheet (1-2 nm) via liquid-phase exfoliation are engineered to extend exciton diffusion lengths and out-of-plane charge mobility, as validated through multimodal characterization. The optimized PM6:Y6:MnPS(3)system achieves record efficiencies of 19.53% (100 nm) and 18.41% (300 nm), demonstrating unprecedented 94.3% thickness tolerance and setting the highest reported retention for thick-film (>300 nm) OPVs. Universal applicability is evidenced through 20.45%/19.70% (D18-Cl:L8-BO system) and 20.41%/19.62% (D18:L8-BO system) efficiencies at 100/300 nm, outperforming state-of-the-art thick-film devices. This monolayer MnPS(3) nanosheet integration paradigm establishes a general design rule for thickness-insensitive organic semiconductors, overcoming the critical photon harvesting-charge extraction dichotomy in industrial-scale OPV manufacturing.
期刊：
Virtual and Physical Prototyping,2025年20(1) ISSN：1745-2759
通讯作者：
Pan, CL
作者机构：
[Pan, Cunliang; Zhu, Hongmei; Wang, Bowen; Pan, CL] Univ South China, Sch Mech Engn, Hengyang 421001, Hunan, Peoples R China.;[Pan, Cunliang; Li, Xiaoqiang; Pan, CL] South China Univ Technol, Guangdong Prov Key Lab Proc & Forming Adv Met Mat, Guangzhou 510640, Peoples R China.;[Jin, Zhengyi; Hufenbach, Julia K.; Kosiba, Konrad] Leibniz Inst Solid State & Mat Res Dresden, Inst Mat Chem, Dresden, Germany.;[Lu, Chao] Guangdong Ocean Univ, Sch Mat Sci & Engn, Yangjiang, Peoples R China.
通讯机构：
[Pan, CL ] U;Univ South China, Sch Mech Engn, Hengyang 421001, Hunan, Peoples R China.;South China Univ Technol, Guangdong Prov Key Lab Proc & Forming Adv Met Mat, Guangzhou 510640, Peoples R China.
关键词：
Additive manufacturing;laser powder bed fusion;CoCrNi MEAs;grain boundary segregation;corrosion
摘要：
The unique solidification behaviour in metal additive manufacturing (AM), can lead to hot cracking, significantly compromising the mechanical properties of the alloys. In this study, grain boundary segregation engineering was employed, using boron (B) as a segregant, to investigate the effects of varying B concentrations on the microstructure and properties of CoCrNi medium-entropy alloys (MEAs). It was demonstrated that B gradually segregated along the grain boundaries, which improved the grain coalescence, intensified the attraction of the columnar grains, and increased the consumption of the liquid film. Furthermore, this segregation behaviour promoted the formation of the Cr2B nanoprecipitates along the grain boundaries. These precipitates reduced grain boundary mobility, hindered grain growth along the temperature gradient, and contributed to grain structure refinement. When the B content is 0.8 at. %, CoCrNi MEAs achieved a trade-off between ductility and strength, with a tensile strength of approximately 1159 MPa, a yield strength of approximately 800 MPa, and an elongation of approximately 31.4%. it also showed excellent corrosion resistance compared to commercial 316L stainless steel. These results underscore grain boundary segregation as an effective strategy for suppressing hot crack formation, thereby broadening the applicability of AM-fabricated components in industrial applications.
摘要：
Concrete pumping technology is widely applied in the construction industry, especially in high-rise buildings and large-span bridges. However, during the actual pumping, concrete may bleed or get segregated, leading to the blockage of a pipe. In order to improve the pumping efficiency and reduce the blockage risk, the flow of fresh concrete with a single-size coarse aggregate(CA) in pipe was simulated, and the effects of size and shape, and volume fraction of CA on the pipe blockage were studied using a Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) coupling method. The flow velocity, pressure distribution and flow state during the concrete pumping process were also analyzed for in-depth understanding of the flow behavior of concrete in the pumping pipe. It was proposed to use the peak pressure on the pumping pipe to characterize the risk of pipe blockage. The cause of pipe blockage formation was analyzed by tracking the movement law, mass and velocity distribution of CA. The obtained results show that local accumulation of CA at the peak pressure position can increase its concentration and decrease the average velocity, causing the peak pressure to rise and increasing the risk of pipe blockage. The risk of pipe blockage increases gradually with increasing size of CA. The most prone blockage takes place at the bend and shifts downward with increasing size of CA. The shape of CA has a lesser impact on the location of the blockage. However, as the shape changes from spherical to ellipsoidal to flaky, the peak pressure gradually increases, thus raising the risk of blockage. With increasing volume fraction of CA, the peak pressure also increases. In order to reduce the risk of pipe blockage, it is recommended that the size of CA should be less than 20 mm, the volume fraction should be no more than 30 %, and the shape should be spherical or ellipsoidal as far as possible.
Concrete pumping technology is widely applied in the construction industry, especially in high-rise buildings and large-span bridges. However, during the actual pumping, concrete may bleed or get segregated, leading to the blockage of a pipe. In order to improve the pumping efficiency and reduce the blockage risk, the flow of fresh concrete with a single-size coarse aggregate(CA) in pipe was simulated, and the effects of size and shape, and volume fraction of CA on the pipe blockage were studied using a Computational Fluid Dynamics-Discrete Element Method (CFD-DEM) coupling method. The flow velocity, pressure distribution and flow state during the concrete pumping process were also analyzed for in-depth understanding of the flow behavior of concrete in the pumping pipe. It was proposed to use the peak pressure on the pumping pipe to characterize the risk of pipe blockage. The cause of pipe blockage formation was analyzed by tracking the movement law, mass and velocity distribution of CA. The obtained results show that local accumulation of CA at the peak pressure position can increase its concentration and decrease the average velocity, causing the peak pressure to rise and increasing the risk of pipe blockage. The risk of pipe blockage increases gradually with increasing size of CA. The most prone blockage takes place at the bend and shifts downward with increasing size of CA. The shape of CA has a lesser impact on the location of the blockage. However, as the shape changes from spherical to ellipsoidal to flaky, the peak pressure gradually increases, thus raising the risk of blockage. With increasing volume fraction of CA, the peak pressure also increases. In order to reduce the risk of pipe blockage, it is recommended that the size of CA should be less than 20 mm, the volume fraction should be no more than 30 %, and the shape should be spherical or ellipsoidal as far as possible.
期刊：
Journal of Materials Engineering and Performance,2025年:1-13 ISSN：1059-9495
通讯作者：
Wang, Liqiang;Fan, XF
作者机构：
[Fan, Xiangfang; Wang, Liqiang] Univ South China, Coll Mech Engn, Hengyang 421100, Peoples R China.;[Zhao, Jianming] Hengyang Valin Steel Tube Co, Hengyang 421000, Peoples R China.
通讯机构：
[Fan, XF ; Wang, LQ] U;Univ South China, Coll Mech Engn, Hengyang 421100, Peoples R China.
关键词：
energy density;H13 steel;hardness;high-temperature wear resistance;laser remelting;laser transformation hardening
摘要：
This paper presents the results of a study on the laser remelting and laser transformation hardening of mandrel H13 steel (quenched and tempered) for a tube rolling mill. The surface of the specimens was irradiated with a continuous high-power fibre laser (RFL-C3300) with a spot size of 12 mm × 2 mm. A comparison of the morphological organisation, microhardness and high-temperature wear resistance of the laser-remelted and laser-phase-change-hardened specimens was carried out to investigate the effect of laser process parameters on the organisation and properties of H13 steel. The results show that the laser-remelted specimens had a better hardening effect and wear resistance at the same power. The solidification organisation of the laser-remelted specimens was mainly in the form of fine equiaxed cells and columnar cells, and the martensite in the phase-change-hardened zone was fine and dense. The microhardness of the surface of the laser-remelted specimens was up to 794.0 HV0.2, which is about 2.6 times higher than that of the substrate. The coefficient of friction and the amount of wear were as low as 0.39 and 0.1221 mm3, respectively, and the wear mechanism was mainly abrasive wear.
摘要：
Surface structuring has attracted growing interest in the industry due to its potential to improve the macroscopic properties of workpieces. This work investigated the surface structuring of metals by combining thermal oxide film mask and laser lithography with isotropic etching. The metals were thermally oxidized to form a protective oxide film, laser ablation patterned the thermal oxide film, while electrochemical etching operated in the isotropic mode obtained an array of hemispherical cavities. The isotropic etching potential for different metals is taken from the mass transport region of the polarization curve. The effects of thermal oxide film thickness and laser ablation area on the uniformity of the etching holes were studied. The thermal oxidation of TA2 at 350 degrees C formed a 20-nm-thick oxide film, while an array of 10 mu m radius hemispherical microcavities was fabricated on the laser patterning surface via electrochemical etching at 2 V for 1 min. The surface structuring of stainless steel, pure nickel, and tungsten is highly dependent on the ability of the oxide film to avoid electrochemical reactions. The feasibility of combining thermal oxidation and laser lithography with electrochemical etching is of great value for the surface structuring of metallic materials for biomedical and microsystem applications.
期刊：
Chemical Engineering Journal,2025年521:166677 ISSN：1385-8947
通讯作者：
Guowen Peng<&wdkj&>Qingyi Zeng
作者机构：
[Shuaishuai Guo; Fangyuan Chang; Wenjie Lu; Yanlu Lu; Jie Jiang; Qingyan Zhang; Qingyi Zeng] School of Resources & Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China;Key Laboratory of Nuclear Facility Decommissioning and Ecological Restoration of the Ministry of Ecology and Environment, Hengyang, Hunan 421001, China;Hunan Provincial Engineering Research Center for Safety Control and Recycling of Radioactive Heavy Metal Pollutants, Hengyang, Hunan 421001, China;[Ping Cao] School of Mechanical Engineering, University of South China, Hengyang, Hunan 421001, China;[Guowen Peng] School of Resources & Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China<&wdkj&>Key Laboratory of Nuclear Facility Decommissioning and Ecological Restoration of the Ministry of Ecology and Environment, Hengyang, Hunan 421001, China<&wdkj&>Hunan Provincial Engineering Research Center for Safety Control and Recycling of Radioactive Heavy Metal Pollutants, Hengyang, Hunan 421001, China
通讯机构：
[Guowen Peng; Qingyi Zeng] S;School of Resources & Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China<&wdkj&>Key Laboratory of Nuclear Facility Decommissioning and Ecological Restoration of the Ministry of Ecology and Environment, Hengyang, Hunan 421001, China<&wdkj&>Hunan Provincial Engineering Research Center for Safety Control and Recycling of Radioactive Heavy Metal Pollutants, Hengyang, Hunan 421001, China<&wdkj&>School of Resources & Environment and Safety Engineering, University of South China, Hengyang, Hunan 421001, China
摘要：
To meet the pressing demands of sustainable nuclear energy development and radioactive pollution mitigation, the development of high-efficiency adsorbents for uranium extraction from real wastewater is paramount. In this study, a MNP@NHCS adsorbent was engineered through a carrier-supported strategy involving in-situ growth of δ-MnO 2 nanoplates (MNP) on N-doped hollow carbon spheres (NHCS). Material characterization confirmed that NHCS suppresses δ-MnO 2 agglomeration and enhances the specific surface area to 218.22 m 2 /g (3.5-fold higher than pristine δ-MnO 2 62.28 m 2 /g). Batch experiments demonstrated exceptional performance: excellent U(VI) adsorption capacity (423.61 mg/g), outstanding selectivity ( K d = 1.9 × 10 5 mL/g), robust recyclability (>95 % removal over 8 adsorption-desorption cycles), and real wastewater breakthrough (95 % uranium recovery rate: 0.21 mg U(VI) / 100 mg ads.). Comprehensive characterization, multi-model fit analysis and in-situ zeta potential monitoring revealed that U(VI) capture follows a spontaneous, endothermic monolayer process driven by coordination-electrostatic synergy between Lewis acid-base sites (Mn-O, -OH, and -NH 2 ) and electrostatic attraction. This work provides an efficient, stable, and eco-friendly adsorbent for real wastewater treatment in the nuclear industry, advancing uranium resource recovery and sustainable nuclear energy development.
To meet the pressing demands of sustainable nuclear energy development and radioactive pollution mitigation, the development of high-efficiency adsorbents for uranium extraction from real wastewater is paramount. In this study, a MNP@NHCS adsorbent was engineered through a carrier-supported strategy involving in-situ growth of δ-MnO 2 nanoplates (MNP) on N-doped hollow carbon spheres (NHCS). Material characterization confirmed that NHCS suppresses δ-MnO 2 agglomeration and enhances the specific surface area to 218.22 m 2 /g (3.5-fold higher than pristine δ-MnO 2 62.28 m 2 /g). Batch experiments demonstrated exceptional performance: excellent U(VI) adsorption capacity (423.61 mg/g), outstanding selectivity ( K d = 1.9 × 10 5 mL/g), robust recyclability (>95 % removal over 8 adsorption-desorption cycles), and real wastewater breakthrough (95 % uranium recovery rate: 0.21 mg U(VI) / 100 mg ads.). Comprehensive characterization, multi-model fit analysis and in-situ zeta potential monitoring revealed that U(VI) capture follows a spontaneous, endothermic monolayer process driven by coordination-electrostatic synergy between Lewis acid-base sites (Mn-O, -OH, and -NH 2 ) and electrostatic attraction. This work provides an efficient, stable, and eco-friendly adsorbent for real wastewater treatment in the nuclear industry, advancing uranium resource recovery and sustainable nuclear energy development.
摘要：
Green products are gaining increasing interest from consumers, but they are often uncertain about the green attributes of products. Although blockchain technology has emerged as a transformative tool for enhancing product traceability and transparency, the adoption of blockchain technology exhibits pronounced heterogeneity among manufacturers with divergent technological capabilities. Additionally, consumers’ behavioral characteristics significantly influence whether manufacturers adopt blockchain technology. This paper segments consumers into blockchain-sensitive and blockchain-insensitive consumers, develops a duopoly game model of technology-differentiated manufacturers’ product pricing and green investment under blockchain technology, explores the conditions for different types of manufacturers to adopt blockchain, and examines how different adoption scenarios impact manufacturers’ decisions. Results show that: (i) Under different blockchain adoption modes, the proportion of blockchain-sensitive consumers or the reservation price discount rate has different impacts on manufacturers’ pricing and green investment decisions. (ii) The manufacturer adopting blockchain will increase the retail price, but whether increase green R&D levels depends on the unit information collection cost. (iii) The technologically advantaged manufacturer always adopts blockchain, while the technologically disadvantaged manufacturer tends to adopt blockchain only when the technological gap is small, and this tendency is inversely related to the unit information collection cost.
Green products are gaining increasing interest from consumers, but they are often uncertain about the green attributes of products. Although blockchain technology has emerged as a transformative tool for enhancing product traceability and transparency, the adoption of blockchain technology exhibits pronounced heterogeneity among manufacturers with divergent technological capabilities. Additionally, consumers’ behavioral characteristics significantly influence whether manufacturers adopt blockchain technology. This paper segments consumers into blockchain-sensitive and blockchain-insensitive consumers, develops a duopoly game model of technology-differentiated manufacturers’ product pricing and green investment under blockchain technology, explores the conditions for different types of manufacturers to adopt blockchain, and examines how different adoption scenarios impact manufacturers’ decisions. Results show that: (i) Under different blockchain adoption modes, the proportion of blockchain-sensitive consumers or the reservation price discount rate has different impacts on manufacturers’ pricing and green investment decisions. (ii) The manufacturer adopting blockchain will increase the retail price, but whether increase green R&D levels depends on the unit information collection cost. (iii) The technologically advantaged manufacturer always adopts blockchain, while the technologically disadvantaged manufacturer tends to adopt blockchain only when the technological gap is small, and this tendency is inversely related to the unit information collection cost.
