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FACNet: Feature alignment fast point cloud completion network

Computational Visual Media 2025年第1期11卷 141-157页

作者： Xinxing Yu Jianyi Li Chi-Chong Wong Chi-Man Vong Yanyan Liang School of Computer Science and Engineering Faculty of Innovation EngineeringMacao University of Science and TechnologyTaipaMacaoChina Faculty of Science and Technology University of MacaoTaipaMacaoChina

Point cloud completion aims to infer complete point clouds based on partial 3D point cloud *** previous methods apply coarseto-fine strategy networks for generating complete point ***,such methods are not only relatively time-consuming but also cannot provide representative complete shape features based on partial *** this paper,a novel feature alignment fast point cloud completion network(FACNet)is proposed to directly and efficiently generate the detailed shapes of *** aligns high-dimensional feature distributions of both partial and complete point clouds to maintain global information about the complete *** its decoding process,the local features from the partial point cloud are incorporated along with the maintained global information to ensure complete and time-saving generation of the complete point *** results show that FACNet outperforms the state-of-theart on PCN,Completion3D,and MVP datasets,and achieves competitive performance on ShapeNet-55 and KITTI ***,FACNet and a simplified version,FACNet-slight,achieve a significant speedup of 3–10 times over other state-of-the-art methods.

关键词： 3D point clouds shape completion geometry processing deep learning

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Fatigue Strength Analysis of Dissimilar Aluminum Alloy TIG Welds

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Journal of Wuhan University of technology(Materials science) 2025年第1期40卷 265-274页

作者： LIAO Xiangyun WANG Ruijie LIU Guoshou ZHAO Pinglin Faculty of Mechanical and Electrical Engineering Kunming University of Science and TechnologyKunming 650500China Faculty of Civil Engineering and Mechanics Kunming University of Science and TechnologyKunming 650500China

The constant amplitude loading fatigue tests were carried out on the 6061/7075 aluminum alloy TIG fillet welded lap specimens in this study,and the weld seam cross-section hardness was *** experimental results show that most specimens mainly failed at the 7075 side weld toes even though the base material tensile strength of 7075 is higher than that of *** maximum stress-strain concentration in the two finite element models is located at the 7075 side weld toe,which is basically consistent with the actual fracture *** weld zone on the 7075 side experiences severe material softening,with a large ***,the Vickers hardness value on the 6061 side negligibly changes and fluctuates around 70 *** obvious defects are found on the fatigue fracture,but a large number of secondary cracks *** germinate from the weld toe and propagate in the direction of the plate *** reinforcement has a serious impact on fatigue *** life will decrease exponentially as the weld reinforcement increases under low *** is found that the notch stress method can give a better fatigue life prediction for TIG weldments,and the errors of the predicted results are within the range of two factors,while the prediction accuracy decreases under low *** equivalent structural stress method can also be used for fatigue life prediction of TIG weldments,but the errors of prediction results are within the range of three factors,and the accuracy decreases under high stress.

关键词： TIG welding notch stress method equivalent structural stress method fatigue life finite element analysis

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Suppressing the oxygen-ionic conductivity and promoting the phase stability of the high-entropy rare earth niobates via Ta substitution

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材料科学技术（英文版） 2025年第6期209卷 79-94页

作者： Mengdi Gan Liping Lai Jiankun Wang Jun Wang Lin Chen Jingjin He Jing Feng Xiaoyu Chong Faculty of Material Science and Engineering Kunming University of Science and TechnologyKunming 650093PR China

Improving and optimizing the target properties of ceramics via the high entropy strategy has attracted significant *** earth niobate is a potential thermal barrier coating(TBCs)material,but its poor high-temperature phase stability limits its further *** this work,four sets of TBCs high-entropy ceramics,(Sm1/5Dy1/5Ho1/5Er1/5Yb1/5)(Nb1/2Ta1/2)O4(5NbTa),(Sm1/6Dy1/6Ho1/6Er1/6Yb1/6Lu1/6)(Nb1/2Ta1/2)O4(6NbTa),(Sm1/7Gd1/7Dy1/7Ho1/7Er1/7Yb1/7Lu1/7)(Nb1/2Ta1/2)O4(7NbTa),(Sm1/8Gd1/8Dy1/8 Ho1/8Er1/8Tm1/8Yb1/8Lu1/8)(Nb1/2Ta1/2)O4(8NbTa)are synthesized using a solid-state reaction method at 1650 ℃ for 6 ***,the X-ray diffractometer(XRD)patterns display that the samples are all single-phase solid solution structures(space group C2/c).Differential scanning calorimetry(DSC)and the high-temperature XRD of 8NbTa cross-check that the addition of Ta element in 8HERN increases the phase transition temperature above 1400 ℃,which can be attributed to that the Ta/Nb co-doping at B site introduces the fluctuation of the bond strength of Ta-O and ***,compared to high-entropy rare-earth niobates,the introduction of Ta atoms at B site substantially reduce thermal conductivity(re-duced by 44％,800 ℃)with the seven components high entropy ceramic as an *** low thermal conductivity means strong phonon scattering,which may originate from the softening acoustic mode and flattened phonon dispersion in 5-8 principal element high entropy rare earth niobium tantalates(5-8NbTa)revealed by the first-principles ***,the Ta/Nb co-doping in 5-8NbTa systems can further optimize the insulation performance of oxygen *** oxygen-ion conductivity of 8NbTa(3.31 × 10-6 S cm-1,900 ℃)is about 5 times lower than that of 8HERN(15.8 × 10-6 S cm-1,900 ℃)because of the sluggish diffusion effect,providing better oxygen barrier capacity in 5-8NbTa systems to inhibit the overgrowth of the thermal growth oxide(TGO)of *** addition,influenced by lattice dis-

关键词： Thermal barrier coating(TBCs) High-entropy rare earth oxides(HEOs) High-temperature phase stability Oxygen-ionic conductivity Thermal conductivity

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Balancing charge carrier density and exciton recombination in defective g-C3N4 for efficient photocatalytic hydrogen evolution

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Progress in Natural science:Materials International 2025年第1期35卷 238-244页

作者： Peng Wu Tao Zhou Zhongqiu Tong Fengshuo Xi Jijun Lu Xiufeng Li Wenhui Ma Shaoyuan Li Xingwei Yang Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology School of Engineering Yunnan University

Graphitic carbon nitride（g-C3N4） is a promising material for photocatalytic hydrogen production owing to its tunable band structure and high charge carrier density, however, it displays a high carrier recombination *** engineering can solve this problem by providing active sites within g-C3N4to accelerate the separation of photogenerated electrons and holes and enhance its solar light absorption. Previous studies have implied that there exists a defect concentration threshold for obtaining the maximum photocatalytic hydrogen production performance, but the underlying mechanism remains unclear. In this study, the relationship between charge carrier density and exciton recombination was investigated to address this issue. A series of g-C3N4photocatalysts with different tri-coordinate nitrogen（N3C） vacancy concentrations were synthesized using in-situ coprecipitation polymerization. The catalytic performance is related to the vacancy concentration, higher vacancy concentration will lead to higher carrier separation efficiency and carrier density of g-C3N4, as well as better photocatalytic hydrogen production performance. However, when excessive vacancies act as recombination centers, the charge carrier recombination rate is increased, which will also adversely affect the photocatalytic hydrogen production performance.

关键词： Defect engineering g-C3N4 Nitrogen vacancies Photocatalytic hydrogen evolution

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Synergistic improvement of mechanical and electromagnetic shielding properties of a Mg-Li-Y-Zn alloy following heat treatment

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Journal of Magnesium and Alloys 2025年第3期13卷 1243-1257页

作者： Jinsheng Li Liping Zhong Junli Wang Zhongxue Feng Yan Qu Ruidong Xu Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China Research Center for Analysis and Measurement Kunming University of Science and TechnologyKunming 650093China Faculty of Metallurgy and Energy Engineering Kunming University of Science and TechnologyKunming 650093China

The performances of magnesium alloys remain insufﬁcient to further enhance the application potential of ultralight magnesium *** this work,a Mg-8Li-3Y-2Zn alloy was prepared through vacuum melting and subsequent heat treatment at 300,450,and 500°*** material properties of the resulting samples were assessed through microstructural observation,tensile testing,electrical conductivity measurements,and electromagnetic shielding effectiveness(EMI-SE)*** inﬂuence of the Mg-8Li-3Y-2Zn alloy microstructure on its mechanical and electromagnetic shielding properties in different states was *** was found that the as-cast alloy containsα-Mg,β-Li,Mg_(3)Zn_(3)Y_(2),and Mg_(12)ZnY *** heat treatment at 500℃(HT500),the blockα-Mg phase transformedﬁne needle-shapes,its tensile strength increased to 263.7 MPa,and its elongation reached 45.3%.The mechanical properties of the alloy were signiﬁcantly improved by the synergistic effects imparted by the needle-shapedα-Mg phase,solid solution strengthening,and precipitation *** addition of Y and Zn improved the EMI-SE of Mg-8Li-1Zn alloy,wherein the HT500 sample exhibits the highest SE,maintaining a value of 106.7–76.9 dB in the frequency range of 30–4500 MHz;this performance has rarely been reported for electromagnetically shielded *** effect was mainly attributed to the multiple reﬂections of electromagnetic waves caused by the severe impedance mismatch of the abundant phase boundaries,which were in turn provided by the dual-phase(α/β)and secondary ***,the presence of nano-precipitation was also believed to enhance the absorption of electromagnetic waves.

关键词： Mg-Li alloy Microstructure Heat treatment Mechanical properties Electromagnetic shielding

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Pseudo-binary composite of Sr_(2)TiMoO_(6)-Al_(2)O_(3)as a novel microwave absorbing material

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Rare Metals 2025年第1期44卷 503-514页

作者： Peng Wu Jun Wang Jian-Yu Li Jing Feng Wen-Ting He Hong-Bo Guo Faculty of Material Science and Engineering Kunming University of Science and TechnologyKunming 650093China School of Materials Science and Engineering Beihang UniversityBeijing 100191China

In this work,a novel microwave absorbing material(MAM)made of a pseudo-binary of Sr_(2)TiMoO_(6)-Al_(2)O_(3)(STM)is proposed *** MAMs labeled as STM X(X=60,70,80 and 100,respectively),in which X is the initial weight percent of Sr_(2)TiMoO_(6),were synthesized using the solid-state reaction *** with STM100,some equilibrium phases,including SrTiO_(3),Mo,Sr_(8)(Al1_(2)O_(24))(MoO_(4))_(2)and a few undefined ones,are presented in the composites as evidenced by X-ray diffraction results and scanning electron microscopy due to the chemical reaction between Sr_(2)TiMoO_(6)and Al_(2)O_(3)*** conductance loss,heterogeneous interfaces between various equilibrium phases introduce interfacial polarization,which causes an enhancement of dissipation for the incident electromagnetic *** the synthesized samples,STM80 presents the best microwave absorbing *** has a minimum reflection loss(RLmin)of-26 dB and an effective absorbing bandwidth up to 2.7 GHz when the thickness is only 1 *** indicates that STM80 is a new type of microwave absorbing material with strong absorption and ultrathin thickness.

关键词： Microwave absorbing material Dielectric property Reflection loss Double perovskite ceramics Sr_(2)TiMoO_(6)

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Cu/TiO_(2)adsorbents modified by air plasma for adsorption-oxidation of H_(2)S

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Journal of Environmental sciences 2025年第2期148卷 476-488页

作者： Yongqi Yan Xinyu Yang Ping Ning Chi Wang Xin Sun Fei Wang Peng Gao Kai Li Faculty of Environmental Science and Engineering Kunming University of Science and TechnologyKunming 650500China National-Regional Engineering Center for Recovery of Waste Gases from Metallurgical and Chemical Industries Kunming University of Science and TechnologyKunming 650500China Faculty of Chemical Engineering Kunming University of Science and TechnologyKunming 650500China City College Kunming University of Science and TechnologyKunming 650500China

In this study,non-thermal plasma(NTP)was employed to modify the Cu/TiO_(2)adsorbent to efficiently purify H_(2)S in low-temperature and micro-oxygen *** effects of Cu loading amounts and atmospheres of NTP treatment on the adsorption-oxidation performance of the adsorbents were *** NTP modification successfully boosted the H_(2)S removal capacity to varying degrees,and the optimized adsorbent treated by air plasma(Cu/TiO_(2)-Air)attained the best H_(2)S breakthrough capacity of 113.29 mg H_(2)S/gadsorbent,which was almost 5 times higher than that of the adsorbent without NTP *** studies demonstrated that the superior performance of Cu/TiO_(2)-Air was attributed to increased mesoporous volume,more exposure of active sites(CuO)and functional groups(amino groups and hydroxyl groups),enhanced Ti-O-Cu interaction,and the favorable ratio of active oxygen ***,the X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)results indicated the main reason for the deactivationwas the consumption of the active components(CuO)and the agglomeration of reaction products(CuS and SO_(4)^(2−))occupying the active sites on the surface and the inner pores of the adsorbents.

关键词： Non-thermal plasma(NTP) Surface modification Simultaneous adsorption-oxidation Cu/TiO_(2)(TiO_(2)loaded with copper) H_(2)S

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Effects of Gd doping on the structure and electrical transport properties of Pr2NiO4 ceramics prepared by the sol-gel routine

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Ceramics International 2025年第15期51卷 20565-20574页

作者： Xie, Yuchen Li, Yule Zhu, Xiangxiang Ding, Shuang Deng, Xuemei Chen, Qingming Zhang, Hui Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming650093 China

In this study, a series of polycrystalline Pr2-xGdxNiO4 (PGNO) ceramics doped with Gd were synthesized using the sol-gel technique. The study analyzed the crystal structure, microstructure, valence states, elemental distribution, and electrical transport properties. X-ray diffraction (XRD) results revealed the presence of an orthorhombic K2NiF4-type structure (Fmmm) and a fluorite Pr6O11 structure (Fm-3m) in the material. Observations of the microstructure confirmed the occurrence of phase separation after the addition of Gd. X-ray Photoelectron Spectroscopy(XPS) analysis indicated a systematic variation in the Pr4+/Pr3+ and Ni3+/Ni2+ ratios within the system. The observed changes impacted the resistivity (ρ), causing it to vary accordingly. The peak value of the temperature coefficient of resistance (TCR) first increased, then decreased as the Gd content increased. When the Gd content reached 0.025, the maximum TCR achieved −4.68 %·K−1, and the temperature range with |TCR| > 3 extended across the operating range of uncooled infrared detectors (230–330 K). Gd doping significantly enhances electrical transport properties, making the material particularly suitable for non-cooled infrared detection. Beyond this specific application, the broader significance of this material lies in its potential to address challenges in electronics, energy, and sensor technologies. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Sol-gel process

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Boosting charge transfer of BiOBr/AgBr S-scheme heterojunctions via interface Br atom co-sharing for enhanced visible-light photocatalytic activity

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Green Energy and Environment 2025年第5期10卷 1073-1084页

作者： Ma, Junhao Xu, Liang Yin, Zhaoyi Li, Zhifeng Song, Zhiguo Qiu, Jianbei Li, Yongjin Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming650093 China

Efficient interfacial charge transfer and robust interfacial interactions are crucial for achieving the superior spatial separation of carriers and developing efficient heterojunction photocatalysts. Herein, BiOBr/AgBr S-scheme heterojunctions are synthesized via the co-sharing of Br atoms using an ion-exchange approach, which involves the in-situ growth of AgBr nanoparticles on the surfaces of BiOBr nanosheets. It is revealed that successful construction of a high–quality interface with strong interactions via Br atom bridge between BiOBr and AgBr, which provided a rapid migration channel for charge carriers. In addition, in-situ XPS, Kelvin probe force microscopy, and electron spin resonance evaluations confirmed the establishment of an S-scheme charge-transfer pathway in this tightly contacted heterojunction, which could efficiently prevent the recombination of photogenerated carriers while retaining carriers with a high redox capacity. Finally, the photocatalytic test confirmed that the BiOBr/AgBr heterojunction showed excellent photocatalytic performance and wide applicability thanks to the construction of high quality heterojunction. Overall, this work highlights the importance of rational designing of heterogeneous interfaces at the atomic level in photocatalysis, and contributes to rationally design BiOBr-based S-scheme heterojunctions photocatalytic materials with high quality atomic co-sharing interfaces. © 2024 Institute of Process engineering, Chinese Academy of sciences

关键词： Ion exchange

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Influence of the mineralogy of fines on sediment slurrying and slurry behaviors

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Journal of Mountain science 2025年第1期22卷 31-47页

作者： SHI Guie XU Zemin WEN Yixi SU Xiao LI Bin YE Ziming MENG Jingkai Faculty of Civil Engineering and Mechanics Kunming University of Science and TechnologyKunming 650500China

Fine debris is an important component of natural debris *** studies focused primarily on the clay minerals found in the fines,and non-clay minerals were often *** effects of mineralogy of fines on debris-mass slurrying and flow behaviors of the resultant slurries are examined *** fines(≤0.04 mm)in the<5 mm fraction of the Dongyuege Creek debris-flow deposit is replaced with five other mineral powders with the same maximum particle *** types of separate and sequential experiments related to debris slurrying and slurry behaviors are carried out with the prepared clastic *** obtained slurrying index ranging from 0.08 to 0.18 shows that non-clay minerals also can function as the fine fractions of debris-flow materials,so long as the requirement of grain size distribution is ***,non-clay minerals making up fines of debris flows can increase the upper solid concentration limits of slurrying(with a maximum of 0.692)and peak values of relative excess water pressure(measured maximum mean peak value is 0.99),leading to higher momentum and higher competence,and thereby more destructive *** sediments with platy non-clay mineral-dominated fines have potential for mobilizing into small-to medium-size debris flows with a relatively small *** minerals in the fines may indeed enhance the liquefaction potential of debris masses by expanding the difference between upper and lower solid concentration limits of slurrying(0.413 and 0.238,respectively,for pure kaolinite),but they significantly suppress the momentum,competence,and destructive power of potential debris flows by lowering upper solid concentration limit of slurrying of debris *** catchments rich in non-clay minerals,notably those releasing dolomite into loose sediments,may be more prone to threatening and destructive debris *** basin producing clay minerals should be more susceptible to lowmagnitude/high-frequency debris flows

关键词： Debris flow Fine debris Mineralogy Clay mineral Non-clay mineral

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