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SSRN 2023年

作者： Ding, Haiyang Tao, Qingdong Tang, Xin Zhao, Haomiao Zhang, Kaibo Li, Jing State Key Laboratory of Environment-friendly Energy Materials School of Material Science and Engineering Southwest University of Science and Technology Sichuan Mianyang621010 China Sichuan Lvxin Power Technology Co. Ltd. Shehong629200 China

NASICON-type Na3V2(PO4)3 (NVP) is a promising cathode material for sodium ion batteries (SIBs). However, replacing V with a low-cost, environmentally friendly metal ion is an immediate priority for NVP industrialisation. In this paper, we synthesize a sodium-rich vanadium-based polyanion cathode material by mechanochemical method. Na3.5V1.5Mn0.5(PO4)3/C (NVMP/C-0.5) shows excellent electrochemical performance and has almost no Jahn-Teller effect. The initial discharge capacity of NVMP/C-0.5 reaches 136.2 mAh g-1 at 0.1 C, and the voltage plateau reaches 3.5 V. NVMP/C-0.5 also exhibits excellent rate performance (96.4 mAh g-1 at 20 C) and long cycle performance (capacity retained 64.7% after 8000 cycles at 20 C). Ex-situ X-ray photoelectron spectroscopy (XPS) tests demonstrate that V3+/V4+, V4+/V5+ and Mn2+/Mn3+ redox pairs are all involved in redox reactions. Ex-situ X-ray diffraction (XRD) tests reveal that NVMP/C-0.5 has high structural reversibility and small volume change in charge-discharge reaction. The high energy density of NVMP/C-0.5//hard carbon full cell confirms the potential application of NVMP/C-0.5. © 2023, The Authors. All rights reserved.

关键词： X ray diffraction

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Ultra-High Sensitive Detection of Pesticide Residue Based Surface Enhanced Raman Scattering with Fe 3 O 4 /Go/Ag As Active Substrates

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SSRN 2023年

作者： Song, Xi Wu, Rui Du, Quanchao Tian, Guanghui Zhang, Pengfei Zhang, Hairan Shaanxi key laboratory of catalysis College of Chemical and Environment Science Shaanxi University of Technology Shaanxi Hanzhong723001 China School of Textile Science and Engineering Xi’an Polytechnic University Shaanxi Xi’an710048 China

It is crucial and urgent challenge to fabricate surface-enhanced Raman scattering (SERS) substrate with high sensitive detection. In the study, three-layer structure of multifunctional Fe3O4/GO/Ag magnetic nanoparticles (NPs) as active substrate of SERS was fabricated. The active substrate was employed to detect pesticide of thiram by SERS technique. It was demonstrated that the number of characteristic peaks for thiram were obvious increased, and intensity were significantly enhanced in the presence of Fe3O4/GO/Ag nanohybrid. Combine with the synergistic effect, Ag NPs possessed high-density and ordered hot spots to enhance the electromagnetic field, so that the signal amplification and fascinating sensitivity were effectively improved. Furthermore, the clear presentation of peak witnessed the concentration ranging from 5×10-16 to 5×10-8 mol/L. There was satisfactory linear relationship, ranging from 5×10-12 to 5×10-8 mol/L, with ultra-high sensitivity. Furthermore, the Fe3O4/GO/Ag was successfully applied in identification of pesticide residues in practical sample. The Fe3O4/GO/Ag could be a potential candidate for SERS active substrate applied in the rapid and true inspection in food, environment and biomedicine with fascinating sensitivity. © 2023, The Authors. All rights reserved.

关键词： Magnetite

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Optimal design of anchor cables layout and length for slope reinforcement based on PSO algorithm

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Arabian Journal of Geosciences 2022年第7期15卷 1-10页

作者： Wang, Min Lu, Zhenxing Zhao, Yanlin Wan, Wen School of Mechanical Engineering Hunan University of Science and Technology Xiangtan China School of Resource Environment and Safety Engineering Hunan University of Science and Technology Xiangtan China Hunan Provincial Key Laboratory of Safe Mining Techniques of Coal Mines Hunan University of Science and Technology Xiangtan China

Determining the optimal cable location and cable length is a frequently encountered but under-addressed problem in slope engineering. To address this issue, an optimization technique for determining the optimal cable layout and minimum cable length was proposed based on the safety factor of the slope. The particle swarm optimization (PSO) algorithm was used to calculate the safety factor of a slope reinforced with anchor cables by using the strength reduction method, and the anchor cable layout and length were adjusted based on the PSO algorithm. By using this method, the minimum anchor cable length that stabilized the slope was obtained, and the location of the anchor cables was determined; moreover, the stability of the slope was guaranteed. A numerical simulation example was performed to validate the proposed method, the numerical simulation results demonstrated that the proposed technique was reliable and workable, and that the optimal cable layout and minimum cable length can be determined with the PSO algorithm. In contrast to the conventional anchor cable scheme, the stability of the slope and the minimum investment were both considered in the proposed method.

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Study on the wet dust collection mechanism of metal-based filter screens and the effect of its inclination angle on dust removal performance

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Process Safety and environmental Protection 2023年 176卷 430-437页

作者： Shuda Hu Shihang Li Hui Cheng Hao Jin Jun Hou Changgeng Gui Xingyue Chen Liang Yuan Fubao Zhou School of Safety Engineering China University of Mining and Technology Xuzhou 221116 China Jiangsu Key Laboratory of Coal-based Greenhouse Gas Control and Utilization Carbon Neutrality Institute China University of Mining and Technology Xuzhou 221008 China School of·Environment Science and·Spatial·Informatics China University·of Mining and Technology Xuzhou 221116 China Key Laboratory of Industrial Dust Control and Occupational Health Ministry of Education Anhui University of Science and Technology Huainan 232001 China

The wet filter dust collector (WFDC) is widely used in dust control in various industries, but its dust collection mechanism is unclear, and the influence of the metal-based filter screen (MBFS) inclination angle on the dust removal performance is still uncertain. In this paper, the liquid film crushing and collecting dust mechanism of MBFS and the influence of its inclination angle on the dust removal performance of WFDC are studied. The results show that with the increase of inclination angle (30° to 150°), the average pressure drop of WFDC first decreases and then increases, the average dust concentration first increases and then decreases, and the MBFS dust removal performance is optimal at 90°. The optimized WFDC was applied on-site in a coal preparation plant, which exceeded the dust suppression efficiencies of 91 % and 88 % for total dust and respirable dust, respectively. The research results are expected to provide theoretical guidance for WFDC design and improvement.

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Safety Assessment of Human with Metal Implants Exposed to Magnetic Field Based on Numerical Method

Safety Assessment of Human with Metal Implants Exposed to Ma...

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International Conference on Computer engineering and Applications (ICCEA)

作者： Yangchun Gao Dianyuan Qi Congsheng Li Hui Zhao State Key Laboratory of Vehicle NVH and Safety Technology China Automotive Engineering Research Institute Co. Ltd Chongqing China Department of Environment and Security. CTTL-Terminals China Academy of Information and Communication Technology Beijing China

This paper presents the dosimetric evaluation of the human exposure to electromagnetic fields from an Electric vehicles power supply system working from 10-Hz to 10 MHz. A realistic siting human model is deformed, and a metal implant model is developed to assessment the induced electrical field. We perform the quasi-static calculation for the 99th percentile induced electric field and current density. The results show that when the population implanted with metal objects is exposed to the electric vehicle induced magnetic field environment, the induced electric field value is higher than the general population but still below the existing guideline restrictions.

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A robustness-enhanced reconstruction based on discontinuity feedback factor for high-order finite volume scheme

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arXiv 2024年

作者： Zhang, Hong Ji, Xing Xu, Kun State Key Laboratory for Strength and Vibration of Mechanical Structures Shaanxi Key Laboratory of Environment and Control for Flight Vehicle School of Aerospace Engineering Xi'an Jiaotong University Xi’an China Department of Mathematics Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Department of Mechanical and Aerospace Engineering Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong Shenzhen Research Institute Hong Kong University of Science and Technology Shenzhen China

In this paper, a robustness-enhanced reconstruction for the high-order finite volume scheme is constructed on the 2-D structured mesh, and both the high-order gas-kinetic scheme(GKS) and the Lax-Friedrichs(L-F) flux solver are considered to verify the validity of this algorithm. The strategy of the successful WENO reconstruction is adopted to select the smooth sub-stencils. However, there are cases where strong discontinuities exist in all sub-stencils of the WENO reconstruction, which leads to a decrease in the robustness. To improve the robustness of the algorithm in discontinuous regions in two-dimensional space, the hybrid reconstruction based on a combination of discontinuity feedback factor(DF) [17] and WENO reconstruction is developed to deal with the possible discontinuities. Numerical results from smooth to extreme cases have been presented and validate that the new finite volume scheme is effective for robustness enhancement and maintains high resolution compared to the WENO scheme. Copyright © 2024, The Authors. All rights reserved.

关键词： Feedback

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Low-cost fabrication of highly dispersed atomically-thin MoS2 nanosheets with abundant active Mo-terminated edges

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Nano Materials Science 2021年第3期3卷 205-212页

作者： Fei Wang Ming Hao Wei Liu Penji Yan Baizeng Fang Sijia Li Jinsheng Liang Maomao Zhu Li Cui Key Laboratory of Special Functional Materials for Ecological Environment and Information(Hebei University of Technology) Ministry of EducationTianjin300130China Institute of Power Source and Ecomaterials Science Hebei University of TechnologyTianjin300130China Dalian National Laboratory for Clean Energy Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian116023China College of Chemistry and Chemical Engineering Key Laboratory of Hexi Corridor Resources Utilization of Gansu UniversitiesHexi UniversityZhangye734000China Department of Chemical&Biological Engineering University of British ColumbiaVancouverV6T 1Z3Canada

In this work,highly dispersed atomically-thin MoS2 nanosheets were fabricated at one thousandth of the commercial cost using sepiolite(SEP)mineral nanofibers as carriers via a microwave hydrothermal *** microscopy revealed the MoS2 nanosheets were only 1–4 atomic layers *** Mo atoms anchored on the mineral surface served as nucleation sites for the nanosheet *** MoS2 layers were in staggered stacking yielding abundant atomic steps at the nanosheets’edges,where catalytically active molybdenum terminations dominated instead of the inert sulfur atoms commonly *** calculations disclosed that the bonding of Mo(MoS2)and O(SEP)at the MoS2/sepiolite(MSEP)interface enabled SEP to be a unique support,superior to the other minerals for growing such highly-dispersed ultrathin MoS2 *** a typical photocatalyisis application,the MSEP demonstrated a significantly improved photocatalytic performance for RhB degradation compared with the MoS2 nanosheets assembled *** work provides an important new strategy for low-cost batch preparation of high quality 2D materials via assembly on mineral materials.

关键词： Molybdenum disulfide Nanosheets Mineral nanofibers Microwave hydrothermal Molybdenum termination Density functional theory

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Ultrafast Decomposition of Refractory Organics by Electric Field Enhanced Permanganate/Peroxymonosulfate Process

SSRN

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SSRN 2024年

作者： Liu, Suo Si, Ting Fan, Jiahui Yang, Shuaishuai Pan, Qixin Zhu, Ying Li, Min Sun, Zhihua Fan, Yuzhu Zhao, Chun Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment Ministry of Education Chongqing University Chongqing400045 China College of Chemistry & Chemical Engineering Chongqing University of Science & Technology Chongqing401331 China College of Water Conservancy and Architectural Engineering Shihezi University Shihezi China

A novel water treatment process called electrolysis-enhanced permanganate/peroxymonosulfate (E-PM-PMS) was investigated. The process demonstrated rapid degradation of persistent organic pollutants, such as carbamazepine (CBZ), diclofenac (DCF), and tetracycline (TC). For the degradation of ibuprofen (IBP), the E-PM-PMS process showed the highest mineralization ratio (55.76%) and the lowest energy consumption (8.930 kWh m-3) within 120 min, compared with the PM-PMS (25.93%, 61.814 kWh m-3) and E-PMS (31.07%, 67.903 kWh m-3) processes. Mechanism studies indicated that the introduction of an electric field could promote the Mn(VII)/Mn(VI) cycle to form more permanganate (VI) complexes, resulting in the generation of more active species. Additionally, the MnO2 produced in large amounts during the reaction could activate PMS to generate active species through the Mn(III)/Mn(IV) cycle, while also being activated by these active species to form Mn(V) and Mn(VI). Both the electric field and PMS reacting with PM led to the formation of various RMnS species (Mn(VI)aq, Mn(V)aq, Mn(IV)s, and Mn(III)aq). Through radical scavenging, electron paramagnetic resonance (EPR) experiments, it was proved that the degradation of IBP was mainly driven by reactive radicals, which are SO4•ˉ(72.24%) and •OH (12.38%). Twelve intermediate products were detected in total, and four possible degradation pathways for ibuprofen were identified. Within a certain range, increasing PMS concentration, PM dosage, current density, NO3ˉ concentration, and decreasing the pH improved the efficiency of IBP elimination in the E-PM-PMS process, while Clˉ, HCO3ˉ, PO43ˉ, and humic acid hindered it. Overall, the E-PM-PMS process shows promise as an economical, eco-friendly, and efficient water treatment technique. © 2024, The Authors. All rights reserved.

关键词： Electron spin resonance spectroscopy

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Phytoremediation of trichloroethylene in the soil/groundwater environment: Progress, problems, and potential

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Science of the Total environment 2024年 954卷 176566页

作者： Cheng, Xianghui Jiang, Longfei Liu, Wuxing Song, Xin Kumpiene, Jurate Luo, Chunling State Key Laboratory of Organic Geochemistry and Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou510640 China University of Chinese Academy of Sciences Beijing100039 China CAS Key Laboratory of Soil Environment & Pollution Remediation Institute of Soil Science Chinese Academy of Sciences Nanjing210008 China Department of Civil Environmental and Natural Resources Engineering Luleå University of Technology Luleå97187 Sweden

Trichloroethylene (TCE) poses a significant environmental threat in groundwater and soil, necessitating effective remediation strategies. Phytoremediation offers a cost-effective and environmentally friendly approach to remediation. However, the mechanisms governing plant uptake, volatilisation, and degradation of TCE remain poorly understood. This review explores the mechanisms of TCE phytoremediation, metabolic pathways, and influencing factors, emphasizing future research directions to improve the understanding of TCE phytoremediation. The results showed that although the proportion of TCE phytovolatilisation is limited, it is important at sites chronically contaminated with TCE. The rhizosphere is a key microzone for pollutant redox reactions that significantly enhance its effectiveness when its characteristics are fully utilised and manipulated through reinforcement. Future research should focus on manipulating microbial communities through methods such as the application of endophytic bacteria and genetic modification. However, practical applications are in their infancy and further investigation is needed. Furthermore, many findings are based on non-uniform parameters or unstandardised methods, making them difficult to compare. Therefore, future studies should provide more standardised experimental parameters and employ accurate and standardised methods to develop suitable prediction models, enhancing data comparability and deepening our understanding of plant detoxification mechanisms. © 2024

关键词： Bacteria

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Modeling of Complex Rough Surface Waves and Ship Wakes Based on SAR Images

Modeling of Complex Rough Surface Waves and Ship Wakes Based...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Kaiyu Li Lu Wang Chunhui Zhao Ning Wang Jikang Chen College of Information and Communication Engineering Harbin Engineering University Harbin China Key Laboratory of Advanced Marine Communication and Information Technology Ministry of Industry and Information Technology Harbin China College of Shipbuilding Engineering Harbin Engineering University Harbin China Frontiers Science Center for Wave Field of Extreme Ocean Environment Harbin China

Conducting research on electromagnetic (EM) modeling and simulation for ship wakes is crucial due to the lack of available Synthetic Aperture Radar (SAR) ship wake datasets for analysis. In this study, we have created a quick simulation model of wake SAR imaging under complex sea circumstances based on the EM scattering theory of random rough surfaces, the theory of ship wave resistance, and the influence of three modulations on radar echo. Using this model, we generated wake SAR images with varying parameters for two separate ship models and two different wave spectra. We evaluated these images using four standard image evaluation indexes to assess the impact of two significant parameters, namely the Froude number and the range-to-velocity ratio. We also investigated the effects of hydrodynamic and SAR parameters on sea surface imaging. Our findings suggest that a design with a higher Froude number and a lower R/V value can result in superior visualization effects. This study contributes to the development of EM modeling and simulation for SAR imaging of ship wakes, which can provide valuable insights for a range of applications.

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