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Enhanced micropollutant degradation over catalyst-free synergistic activation of periodate and persulfate under solar light

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Environmental science and Pollution Research 2025年 1-14页

作者： Zheng, Zexiao Man, Justin H. K. Wang, Xiaoying Kwan, Alvin S. K. Yim, Kwan To Lo, Irene M. C. Department of Civil and Environmental Engineering The Hong Kong University of Science and Technology Hong Kong Institute for Advanced Study The Hong Kong University of Science and Technology Hong Kong

Micropollutants are ubiquitous in water sources, posing threats to both human health and ecosystems. Conventional water and wastewater treatment processes are inefficient in micropollutant removal. In this study, the energy-effective and environmentally friendly solar light–driven periodate (PI) and peroxydisulfate (PDS) synergistic activation process (PI/PDS/solar light) is developed for efficient micropollutant decontamination. The PI/PDS/solar light process (0.5 mM PI and 0.25 mM PDS) achieves 100% degradation of 2 ppm CBZ in 15 min with a CBZ degradation rate constant of 0.31 min−1, which is 6.6 and 13.2 times that of PI/solar light (0.046 min−1, 0.5 mM PI) and PDS/solar light (0.023 min−1, 0.5 mM PDS). Mechanistic studies reveal that the enhanced solar light utilization and charge transfer between PI and PDS lead to the synergistic activation of the dual oxidants in the PI/PDS/solar light process, thus promoting micropollutant degradation. Additionally, the scavenging tests demonstrate that •OH and SO4•− are the dominant radicals for CBZ degradation. Furthermore, the PI/PDS/solar light process exhibits excellent applicability in different types of water sources, where several water components (pH, natural organic matter, and anions) pose insignificant impacts on CBZ degradation. Nonetheless, the developed process still has a disadvantage in that the degradation intermediates of PPCPs may bring potential toxicity. The study offers valuable mechanistic insights into the novel synergistic PI and PDS coactivation process under solar light and highlights the practicability of the developed technique as an efficient strategy for micropollutant decontamination. © The Author(s) 2025.

关键词： Decontamination

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Microstructure and Hot Tearing Sensitivity Simulation and Parameters Optimization for the Centrifugal Casting of Al-Cu Alloy

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Computers, Materials & Continua 2024年第8期80卷 2873-2895页

作者： Xueli He Shengkun Lv Ruifeng Dou Yanying Zhang Junsheng Wang Xunliang Liu Zhi Wen School of Energy and Environmental Engineering(SEEE) University of Science and Technology Beijing(USTB)Beijing100083China Advanced Research Institute of Multidisciplinary Science(ARIM) Beijing Institute of Technology(BIT)Beijing100081China

Four typical theories on the formation of thermal tears:strength,liquid film,intergranular bridging,and solidifica-tion shrinkage compensation *** these theories,a number of criteria have been derived for predicting the formation of thermal cracks,such as the stress-based Niyama,Clyne,and RDG(Rapaz-Dreiser-Grimaud)*** this paper,a mathematical model of horizontal centrifugal casting was established,and numerical simulation analysis was conducted for the centrifugal casting process of cylindrical Al-Cu alloy castings to investigate the effect of the centrifugal casting process conditions on the microstructure and hot tearing sensitivity of alloy castings by using the modified RDG hot tearing *** show that increasing the centrifugal rotation and pouring speeds can refine the microstructure of the alloy but increasing the pouring and mold preheating temperatures can lead to an increase in grain *** grain size gradually transitions from fine grain on the outer layer to coarse grain on the inner ***,combined with the modified RDG hot tearing criterion,the overall distribution of the castings’hot tearing sensitivity was *** analysis results indicate that the porosity in the middle region of the casting was large,and hot tearing defects were prone to *** hot tearing tendency on the inner side of the casting was greater than that on the outer *** effects of centrifugal rotation speed,pouring temperature,and preheating temperature on the thermal sensitivity of Al-Cu alloy castings are summarized in this *** study revealed that the tendency of alloy hot cracking decreases with the increase of the centrifugal speed,and the maximum porosity of castings decreases first and then increases with the pouring *** the preheating temperature increases,the overall maximum porosity of castings shows a decreasing trend.

关键词： Centrifugal casting Al-Cu alloy microstructure hot tearing simulation

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Cross-dataset COVID-19 transfer learning with data augmentation

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International Journal of Information technology (Singapore) 2025年 1-14页

作者： Atmaja, Bagus Tris Zanjabila Suyanto Asmoro, Wiratno Argo Sasou, Akira Sepuluh Nopember Institute of Technology Surabaya Indonesia National Institute of Advanced Industrial Science and Technology Tokyo Japan

This paper presents a novel cross-dataset transfer learning approach for cough-based COVID-19 detection, enhancing model performance through data augmentation. Our methodology significantly improves results compared to baseline methods. An ablation study highlights the importance of alpha mixup among various hyperparameters in optimizing performance. The final model achieves an unweighted accuracy of 88.19%. Additionally, we provide a comparative summary with previous studies on the same evaluation set to offer insights into cough-based detection methods. © Bharati Vidyapeeth's institute of Computer Applications and Management 2025.

关键词： Cough detection Cough segmentation COVID-19 Data augmentation Transfer learning

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Improving flangeability of multiphase steel by increasing microstructural homogeneity

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Journal of Iron and Steel Research International 2024年第7期31卷 1736-1745页

作者： Xiao-yu Yang Yong-gang Yang Xing Fang Han-long Zhang Zhen-li Mi Beijing Advanced Innovation Center for Materials Genome Engineering Institute of Engineering TechnologyUniversity of Science and Technology BeijingBeijing 100083China Shanghai Baosteel Group Corp.Technology Center Shanghai 201900China

Multiphase microstructure significantly increases the strength,usually at the expense of flangeability because of lacking microstructure *** further improve the strength-flangeability of multiphase steel,the microstructural homogeneity was advanced by adjusting the hard martensite/austenite(M/A)*** strength-flangeability was measured via uniaxial tensile tests and hole expansion *** microstructures were characterized using a scanning electron microscope equipped with an electron backscatter diffraction detector and a transmission electron *** tests were supplementally used to quantitatively reveal the microstructural homogeneity of the *** show that the adjusted multiphase steel achieves an excellent ultimate tensile strength(~800 MPa)and flangeability(~135%hole expansion ratio).A promising homogeneous multiphase microstructure was obtained by controlling undercooled austenite transformed at about 600℃.This microstructure consists of soft polygonal ferrite,blocky bainitic ferrite,and hard M/A *** volume fraction of M/A islands is around 5%,and the average size is less than l *** nanoindentation analysis indicated that the participation of M/A islands impressively influenced the microstructural *** strain partition and better mechanical compatibility were present in the adjusted multiphase steel since the plasticity initiation started late,which resulted in a positive ***,avoiding M/A islands distributed in the chain along the rolling direction on the matrix hindered the possibility of voids coalescing into cracks and stabilized the flanging performance.

关键词： Multiphase steel Flangeability Martensite/austenite island-Microstructural homogeneity-Microstructure Compact strip production process

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Analysis and Modeling of Calendar Aging and Cycle Aging of LiCoO_(2)/Graphite Cells

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Journal of Thermal science 2024年第3期33卷 1109-1118页

作者： WANG Wei YUAN Baoqiang SUN Qie WENNERSTEN Ronald Institute of Thermal Science and Technology Shandong UniversityJi’nan250061China School of Energy and Power Engineering Shandong UniversityJi’nan250061China Institute for Advanced Science and Technology Shandong UniversityJi’nan250061China

Lithium-ion batteries are used in a wide range of ***,their cycle life suffers from the problem of capacity fade,which includes calendar and cycle *** effects of storage time,temperature and partial charge-discharge cycling on the capacity fade of Li-ion batteries are investigated in this *** calendar aging and cycle aging are presented based on the storage and cycling experiment on LiCoO_(2)/graphite cells under different storage temperature and different ranges of state of charge(SOC).Based on the measurement data,a one-component and a double-component aging model are presented to respectively describe the capacity fade caused by calendar and cycle *** calendar aging of LiCoO_(2)/graphite batteries is mainly affected by temperature and SOC during the *** SOC and change in SOC(ΔSOC)are the main factors affecting battery degradation during cycling operation.

关键词： Lithium-ion battery LiCoO_(2)(LCO)/graphite calendar aging cycle aging lifetime model

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Two-dimensional superconducting MoSi2N4（MoN）4n homologous compounds

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National science Review 2023年第4期10卷 142-149页

作者： Zhibo Liu Lei Wang Yi-Lun Hong Xing-Qiu Chen Hui-Ming Cheng Wencai Ren Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China Shenzhen Institute of Advanced Technology Chinese Academy of Sciences

The number and stacking order of layers are two important degrees of freedom that can modulate the properties of 2D van der Waals（vdW） materials. However, the layers' structures are essentially limited to the known layered 3D vdW materials. Recently, a new 2D vdW material, MoSi2N4, without known 3D counterparts, was synthesized by passivating the surface dangling bonds of non-layered 2D molybdenum nitride with elemental silicon, whose monolayer can be viewed as a monolayer MoN（-N-Mo-N-）sandwiched between two Si-N layers. This unique sandwich structure endows the MoSi2N4monolayer with many fascinating properties and intriguing applications, and the surface-passivating growth method creates the possibility of tuning the layer's structure of 2D vdW materials. Here we synthesized a series of MoSi2N4（MoN）4nstructures confined in the matrix of multilayer MoSi2N4. These super-thick monolayers are the homologous compounds of MoSi2N4, which can be viewed as multilayer MoN(Mo4n+1N4n+2)sandwiched between two Si-N layers. First-principles calculations show that MoSi2N4（MoN）4monolayers have much higher Young's modulus than Mo N, which is atributed to the strong Si-N bonds on the ***, different from the semiconducting nature of the Mo Si2N4monolayer, the MoSi2N4（MoN）4monolayer is identified as a superconductor with a transition temperature of 9.02 K. The discovery of MoSi2N4（MoN）4nstructures not only expands the family of 2D materials but also brings a new degree of freedom to tailor the structure of 2D vd W materials, which may lead to unexpected novel properties and applications.

关键词： MoSi2N4 2D layered materials homologous compounds iDPC-STEM superconduct

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High mass-loading and binder-free flexible vanadium-based oxide cathode for zinc-ion battery via a bridge of MXene

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Journal of Materials science & technology 2023年第12期143卷 84-92页

作者： Kan Fang Fei Li Gui-Gen Wang Yi-Lin Liu Man-Lin Tan Da-Qiang Zhao Hua-Yu Zhang Jie-Cai Han Shenzhen Key Laboratory for Advanced Materials School of Materials Science and EngineeringHarbin Institute of TechnologyShenzhen 518055China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin 150080China Research Institute of Tsinghua University in Shenzhen Shenzhen 518055China

Flexible zinc-ion batteries(ZIBs)are promising power sources for portable devices due to their high safety and low production ***,the low mass-loading and limited areal capacity of cathode materials are the major problems blocking the practicability of ***,a high mass-loading and binder-free flexible vanadium oxide(MCV@CC)cathode with a large areal capacity was fabricated via the bridge effect of *** functional MXene bridge induces the growth of the vanadium oxide active layer on the carbon cloth(CC)flexible *** binder-free cathode can reduce the electrochemically inactive weight of the whole electrode,which enhances the energy density of ***,the MCV@CC cathode(mass-loading of∼7 mg cm^(−2))delivers a desirable areal capacity(2.36 mAh cm^(−2))and good cycling stability(capacity retention of 86.1%after 1200 cycles at 10 mA cm^(−2)).Moreover,several ex-situ characterization results indicate that the reaction mechanism upon battery cycling is based on the reversible Zn^(2+)/H^(+)(de)intercalation in the vanadium oxide ***,the assembled quasi-solid-state MCV@CC//Zn flexible battery exhibits decent performance at different bending *** a bridge effect strategy sheds light on the construction of high mass-loading flexible electrodes for ZIBs applications.

关键词： Zinc-ion batteries Vanadium oxide MXene bridge High mass-loading Flexible electrode

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Lithography-free polarization-dependent absorber based on α-MoO_(3)

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science China(Technological sciences) 2024年第7期67卷 2147-2152页

作者： HU Yang WU XiaoHu LI HongJu ZHAO Yi LIU HaoTuo HUANG XiuQuan School of Power and Energy Northwestern Polytechnical UniversityXi’an 710072China Shandong Institute of Advanced Technology Jinan 250100China School of Physics Hefei University of TechnologyHefei 230009China Department of Academic Affairs Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of EducationHarbin University of Science and TechnologyHarbin 150080China

As a natural biaxial hyperbolic material, α-phase molybdenum trioxide(α-MoO_(3)) exhibits dielectric and metallic properties in the plane, rendering it an exceptional candidate for polarization-dependent devices. In this work, we design a lithography-free polarization-dependent absorber consisting of an α-MoO_(3)film, a germanium layer, and a silver substrate. The results show that a narrowband absorption of up to 0.99 is achieved at a wavelength of 12.2 μm for transverse magnetic polarization. In contrast, the absorption is only 0.06 at this wavelength for transverse electric polarization. This remarkable polarization-dependent absorption performance is attributed to the coupling of epsilon-near-zero modes and Fabry-Perot resonances, which is confirmed by the electric field and power dissipation density distributions. Furthermore, strong polarization-dependent performance could also be achieved when the crystal axis of α-MoO_(3)is rotated in the out-of-plane. This work demonstrates that in-plane anisotropic α-MoO_(3)has the potential for designing high polarization-dependent devices.

关键词： α-MoO_(3) polarization-dependent epsilon-near-zero modes Fabry-Perot resonances

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Element-based Peridynamics for Heat Conduction Problems of Isotropic and Anisotropic Materials With Crack Propagation

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Journal of Peridynamics and Nonlocal Modeling 2024年第4期6卷 725-772页

作者： Liu, Shuo Liang, Jun Fang, Guodong Institute of Advanced Structure Technology Beijing Institute of Technology Beijing 100081 China Science and Technology on Advanced Composites in Special Environment Key Laboratory Harbin Institute of Technology Harbin 150001 China

Element-based peridynamics (EBPD) for transient and steady heat conduction of isotropic and anisotropic materials is proposed, which can conveniently study the thermal transfer problems with cracks. The interactions of EBPD are described using 2-node rod elements for one-dimensional (1D) problems, 3-node triangle elements for two-dimensional (2D) problems and 4-node tetrahedron elements for three-dimensional (3D) problems. An additional rule constructing elements in the EBPD is added to reduce element numbers and delete the low mesh quality elements. The EBPD transient heat conduction equations are derived from the Lagrangian formalism, and the steady heat conduction equations are obtained by the variation principle. The treatments of surface effects, boundary conditions and crack descriptions are provided in detail. The forward difference time increment scheme and Gauss elimination method are used to solve transient and steady heat conduction problems respectively. A series of numerical examples, including 1D, 2D and 3D transient and steady heat conduction problems, are used to validate the proposed EBPD model. The temperature fields of the model with cracks are solved by the proposed method, which has the potential to study thermomechanical and thermal shock problems. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2024.

关键词： Element-based Heat conduction Nonlocal Peridynamics

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DualSmoke: Sketch-based smoke illustration design with two-stage generative model

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Computational Visual Media 2024年第5期10卷 965-979页

作者： Haoran Xie Keisuke Arihara Syuhei Sato Kazunori Miyata Graduate School of Advanced Science and Technology Japan Advanced Institute of Science and Technology1-1 NomiIshikawa 9231292Japan Graduate School of Computer and Information Sciences Hosei University3-7-2 Kajino-choKoganei-shiTokyo 1848584Japan

The dynamic effects of smoke are impressive in illustration design,but it is a troublesome and challenging issue for inexpert users to design smoke effects without domain knowledge of fuid *** this work,we propose DualSmoke,a two-stage globalto-local generation framework for interactive smoke illustration *** the global stage,the proposed approach utilizes fluid patterns to generate Lagrangian coherent structures from the user's hand-drawn *** the local stage,detailed flow patterns are obtained from the generated coherent ***,we apply a guiding force field to the smoke simulator to produce the desired smoke *** construct the training dataset,DualSmoke generates flow patterns using finite-time Lyapunov exponents of the velocity *** synthetic sketch data are generated from the fow patterns by skeleton *** user study verifies that the proposed design interface can provide various smoke illustration designs with good user *** code is available at https://***/shasph/DualSmoke.

关键词： smoke simulation flow control generative adversarial network(GAN) finite-time lyapunov exponent(FTLE) Lagrangian coherent structure(LCS)

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