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Interannual succession of phytoplankton community in a canyon-shaped drinking water reservoir during the initial impoundment period:Taxonomic versus functional groups

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Journal of environmental Sciences 2025年第5期151卷 454-468页

作者： Yi Hou Ya Cheng Kai Li Meng Yang Kangzhe Huang Gang Ji Ruikang Xue Tinglin Huang Gang Wen Shaanxi Provincial Field Scientific Observation and Research Station of Water Quality in Qinling Mountains Xi’an University of Architecture and TechnologyXi’an 710055China Key Laboratory of Northwest Water Resource Environment and EcologyMOEXi’an University of Architecture and TechnologyXi’an 710055China School of Environmental and Municipal Engineering Xi’an University of Architecture and TechnologyXi’an 710055China

During the initial impoundment period of a canyon-shaped reservoir,the water body fluctuated violently regarding water level,hydrological condition,and thermal *** variations may alter the structure of phytoplankton community,resulting in algal blooms and seriously threatening the ecological security of the *** is of great significance to understand the continuous changes of phytoplankton in the initial impoundment period for the protection of reservoir water ***,a two-year in-situ monitoring study was conducted on water quality and phytoplankton in a representative canyonshaped reservoir named Sanhekou and the interannual changes of phytoplankton community and its response to environmental changes during the initial impoundment period were discussed at taxonomic versus functional classification *** results showed that the total nitrogen and permanganate index levels were relatively high in the first year due to rapid water storage and heavy rainfall input,and the more stable hydrological conditions in the second year promoted the increase of algae density and the transformation of community,and the proportion of cyanobacteria increased *** succession order of phytoplankton in the first year of the initial impoundment periodwas Chlorophyta-Bacillariophyta-Chlorophyta,or J/F/X1-P/MP/W1-A/X1/MP,*** the succession order in the second year was Cyanobacteria/Chlorophyta-Bacillariophyta-Chlorophyta,or L_(M)/G/P-P/A/X1-X1/J/*** temperature,relativewater column stability,mixing depth,and pHwere crucial factors affecting phytoplankton community *** study revealed the interannual succession law and driving factors of phytoplankton in the initial impoundment period and provided an important reference for the operation management and ecological protection of canyon-shaped reservoirs.

关键词： Canyon-shaped reservoir Functional groups Initial impoundment Interannual succession Water quality

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Computational Study of Strain-Engineered Black/Blue Phosphorene Nanosheets as Anchoring and Catalytic Materials for Lithium-Sulfur and Lithium-Selenium Batteries

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ACS Applied Nano Materials 2025年第18期8卷 9326-9338页

作者： Zhang, Qian Liu, Yongkang Li, Hao Li, Hongliang Liu, Zhe Jin, Minghui Fu, Aiping College of Chemistry and Chemical Engineering Qingdao University Qingdao266071 China State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing100029 China Institute of Materials for Energy and Environment College of Materials Science and Engineering Qingdao University Qingdao266071 China

Despite the prosperous prospects of lithium-sulfur (Li-S) and lithium-selenium (Li-Se) batteries, the severe shuttle effect and slow redox reactions greatly inhibited their further development. Designing efficient anchoring and catalytic cathode host materials is an important strategy to meet the above challenges. Strain engineering can be used to regulate the electrochemical properties of electrode materials to promote their performance for batteries. In the present work, the feasibility and efficiency of strain-modulated black/blue phosphorene nanosheets as cathode host materials for Li-S and Li-Se batteries have been investigated by density functional theory (DFT) calculations. The ab initio molecular dynamics simulation and phonon spectral calculations confirm the thermal and kinetic stability of the strained phosphorene. The tensile strain has an unfavorable effect on the anchoring performance of phosphorene toward polysulfides or polyseleniums, while the compressive strain can strengthen their immobilization ability, with the −7% strain guaranteeing the black/blue phosphorene nanosheets to be the qualified anchoring materials to effectively suppress the shuttle effect of Li-S and Li-Se batteries. Furthermore, the compressive strain (optimal value: −7%) can promote the bidirectional electrocatalytic activity of phosphorene for the sulfur/selenium reduction reaction (SRR/SeRR) and Li2S/Li2Se oxidation. Combined with the enhanced electronic conductivity of phosphorene under −7% compressive strain and the fast Li ion diffusion, the presented merits demonstrate that the black/blue phosphorene nanosheets under appropriate strain can be promising anchoring and catalytic materials, and strain engineering is a useful strategy for improving the electrochemical performance of Li-S/Li-Se batteries. © 2025 American Chemical Society.

关键词： Nanosheets

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Indoor Geomagnetic Matching Location Based on Iterative Local Search and Improved Particle Swarm Fusion

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IEEE Robotics and Automation Letters 2025年第6期10卷 5337-5344页

作者： Tian, Pingyi Li, Kai Wu, Xuanqi Yu, Sanqiang Hu, Yu Shi, Qin North University of China School of Information and Communication Engineering State key Laboratory of Extreme Environment Optoelectronic Dynamic Testing Technology and Instrument Taiyuan030051 China North University of China School of Mathematics Taiyuan030051 China

In the complex indoor environment, geomagnetic matching is an effective way to realize indoor positioning of mobile robots. Aiming at the problem that the application of Particle Swarm Optimization (PSO) algorithm leads to the decline of geomagnetic matching accuracy, stability and convergence speed, an Iterated Local Search-Improved Particle Swarm Optimization (ILS-IPSO) algorithm is proposed. By analyzing the time-frequency characteristics and data distribution characteristics of geomagnetic survey data, geomagnetic data preprocessing and geomagnetic reference map construction are carried out. By introducing 3{\bm{\sigma }} contour Search domain constraint in the particle swarm optimization process, the weight factor, learning factors, step control factor of PSO algorithm are optimized, and finally the Local disturbance and search are implemented in combination with Iterated Local Search (ILS) algorithm. The experimental results show that the average matching accuracy error of ILS-IPSO is reduced to 0.0508 m, and the standard deviation of matching error is reduced to 0.0198m. Compared with PSO, Linear Dynamic time-varying Inertial Weight Particle Swarm Optimization algorithm (LDIW-PSO) and Cosine Decreasing Inertia Weight Particle Swarm Optimization algorithm (CDIW-PSO) algorithms, the average matching accuracy is increased by 94.72%, 92.37% and 87.98%, the standard deviation of matching error decreased by 87.13%, 83.26% and 89.81% respectively. The optimal fitness of ILS-IPSO algorithm is increased by 79.51%, 61.81% and 57.06%, and the iteration efficiency is increased by 69.23%, 55.56% and 33.33%, respectively. This method performs well in the accuracy, stability and convergence of geomagnetic positioning, and can be widely used in the field of indoor positioning. © 2016 IEEE.

关键词： Particle swarm optimization (PSO)

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Micro-convex structure-assisted laser-induced backside dry etching for high-efficiency fabrication of micro-groove array on fused silica toward manipulation of wetting characteristics

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Journal of Manufacturing Processes 2025年 145卷 236-251页

作者： Huang, Hu An, Hong Qian, Yongfeng Zhang, Zhiyu Jiang, Minqiang Yan, Jiwang Key Laboratory of CNC Equipment Reliability Ministry of Education School of Mechanical and Aerospace Engineering Electron Microscopy Center Jilin University Changchun130022 China Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun130033 China State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing100190 China School of Engineering Science University of Chinese Academy of Sciences Beijing101408 China Department of Mechanical Engineering Faculty of Science and Technology Keio University Yokohama223-8522 Japan

Fused silica has garnered significant attention in various industrial applications. The creation of surface micro/nanostructures on fused silica can impart specialized functional properties, such as extreme wettability, ultra-high transmittance, and excellent antimicrobial characteristics. Nonetheless, existing technologies for achieving surface micro/nanopatterning of fused silica, including wire electrical discharge machining, chemical etching, and electrochemical deposition, generally suffer from long processing cycles and high energy consumption, which are inconsistent with the development concept of the low-carbon economy. In this study, a novel approach termed micro-convex structure-assisted laser-induced backside dry etching (MCSALIBDE) is proposed for high-efficiency fabrication of micro-groove array on fused silica surfaces. The synergistic effect of enhanced heat conduction and plasma explosion in a confined space facilitates material ablation. The impact of processing parameters including scanning pitch and peak laser power intensity on the morphological and topographical features of the MCSALIBDE-processed fused silica surfaces is studied. Notably, the micro-groove structures with a depth-to-width ratio of 1.19 is fabricated. Furthermore, the wetting behaviors of the MCSALIBDE-processed fused silica surfaces before and after annealing treatment are studied. Experimental findings reveal that the MCSALIBDE-processed fused silica surfaces exhibit enhanced hydrophilicity compared to the untreated one. After annealing treatment, a transformation from hydrophilicity to superhydrophobicity is observed. The superhydrophobic surfaces produced under different laser parameters exhibit distinct adhesion and droplet bouncing behaviors. This work offers an in-depth understanding of the high-efficiency fabrication of micro/nanostructures on fused silica surfaces and as well the modulation of their wetting characteristics, heralding innovations in surface engineering fo

关键词： Wetting

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Analysis of Microburst Disturbance Effects on Large Aircraft Longitudinal Open-Loop Flight Qualities Using CAP Criteria

Analysis of Microburst Disturbance Effects on Large Aircraft...

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15th Asia Conference on Mechanical and Aerospace engineering, ACMAE 2024

作者： Cai, Yuhong Huang, Duojia Liu, Wenhao Qiao, Lina CEPREI Guangdong province Guangzhou511370 China Guangdong Provincial Key Laboratory of Intelligent Unmanned Systems for Reliability and DigitalVerification Guangdong province Guangzhou511370 China The Ministry of Industry and Information Technology Key Laboratory of Quality and Reliability Engineering Technology of Civil Aircraft and Aero-Engine Guangdong province Guangzhou511370 China

ISBN: (纸本)9781643685892

The pivotal influence of microburst phenomena on open-loop flight quality necessitates meticulous consideration during the conceptual design of large aircraft and flight control systems. This study delves into the implications of microburst wind field intensity on the longitudinal open-loop flight qualities of large aircraft, leveraging the microburst vortex model in conjunction with a longitudinal small disturbance linearized flight dynamics model. Our findings reveal that, within the downwash region, the intensity of the microburst wind field exerts a marginal influence on the equivalent short-period frequency and damping ratio of open-loop flight quality. Conversely, it significantly alters the pitch mode time constant and Control Anticipation Parameter (CAP). Notably, as the aircraft traverses distinct regions within the microburst wind field, characterized by a maximum horizontal wind speed variation of 20m/s, there is a discernible trend towards a degradation in flight quality, approaching the threshold of Level II standards. © 2025 The Authors.

关键词： Open loop control

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Automatic Urban Green Space Identification Based on GEE and Sentinel-2 Imagery 24

Automatic Urban Green Space Identification Based on GEE and ...

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8th International Conference on Electronic Information technology and Computer engineering, EITCE 2024

作者： Zhang, Daren Man, Wang Lin, Tao Liu, Yuqin Geng, Hongkai School of Computer & Information Engineering Xiamen University of Technology Fujian Xiamen China Key Laboratory of Urban Environment and Health Institute of Urban Environment Chinese Academy of Sciences Fujian Xiamen China

ISBN: (纸本)9798400710094

In contemporary urban ecological development and resource management, the establishment of urban green spaces is a crucial indicator of urban ecological quality and plays a significant role in improving the ecological environment. Therefore, accurate identification of green spaces is vital for urban ecological development. Remote sensing technology is commonly used for green space identification;however, traditional methods for sample point labeling are cumbersome and labor-intensive, limiting the application of large-scale data processing. Hence, a more efficient method for automatic sample point generation is needed. To alleviate the burden of manual sample point labeling, this study proposes an algorithm and selection rules for automatic sample point generation based on the Google Earth Engine (GEE) cloud computing platform. The algorithm relies on adding random points within the pixel mask layer of an unsupervised classification result map. By merging closely spaced random points, the algorithm purifies and assigns attribute values to generate sample points with attributes. The sample points generated by this method are comparable to those manually labeled on maps. This algorithm and selection rules not only apply to the specific context of this study but also have considerable potential for selecting sample points in other land cover types. Although the classification result accuracy (91.9%) is slightly lower compared to manual labeling (98.7%), this method significantly enhances work efficiency and reduces the labor required for manual labeling. Additionally, the algorithm demonstrates good portability. The automatic sample point generation algorithm, combined with the sample point selection rules, has significant application prospects in map data processing and can provide strong support for urban ecological development. © 2024 Copyright held by the owner/author(s).

关键词： Green development

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Lightning Current Sweep Damage Test System Based on Energy Conversion 19th

Lightning Current Sweep Damage Test System Based on Energy C...

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19th Annual Conference of China Electrotechnical Society, ACCES 2024

作者： Duan, Zemin Tong, Chen Qu, Minglei Huang, Yeyuan School of Electrical Engineering and Automation Hefei University of Technology Hefei China National Key Laboratory of Electromagnetic Information Control and Effects Hefei China Key Laboratory of Strong Electromagnetic Environment Protection Technology Aviation Science and Technology Hefei China Key Laboratory of Aircraft Lightning Protection of Anhui Province Hefei China

ISBN: (纸本)9789819608966

To solve the problem of difficulty in simulating dynamic sweep damage of lightning current, this paper established a new lightning current sweep damage test system using motors and launch wheels. The speed of the test piece and the temperature during the damage process were measured by high-speed cameras and infrared thermometers. The speed of the test piece was 34 m/s and the temperature exceeded 600 °C. At the same time, a new lightning current component C generator topology and control method were proposed. The load current and inductor current were used to form a double closed-loop PI negative feedback controller to ensure that the load current meets the standard output requirements. The study in this paper has certain guiding significance for the direct effect sweep damage assessment of composite materials and the design of lightning current generators. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： High speed cameras

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More mass wasting activities reported in sedongpu gully of Tibetan plateau, China

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Journal of Rock Mechanics and Geotechnical engineering 2025年第5期17卷 3280-3288页

作者： Li, Weile Zhao, Bo Lu, Huiyan Li, Zhigang Yu, Wenlong Zhou, Shengsen Xu, Qiang State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Chengdu 610059 China State Key Laboratory of Mountain Hazards and Engineering Resilience and Institute of Mountain Hazards and Environment Chinese Academy of Sciences Chengdu 610041 China

Although the increase in the frequency of mass wasting events in the Sedongpu gully in recent years indicates that the Sedongpu gully has entered an intense mass wasting period, the current literature focuses only on ice‒rock avalanche events and lacks comprehensive knowledge of Sedongpu gully activity. To clarify the spatiotemporal distribution and scales of mass wasting events, we analysed multiple images from 1969 to present (including optical images and synthetic aperture radar (SAR) images) and topography data from 2013 to present. Since 1969, there have been at least 19 obvious mass wasting events that can be divided into 3 subpatterns: ice‒rock avalanches (IRAs, 8 events), ice‒moraine avalanches (IMAs, 2 events), and glacier debris flows (GDFs, 9 events). Since 2017, the Sedongpu gully has entered the most active period, i.e. more than 68% of events occurred after 2017, and approximately 530 Mm³ and 185 Mm³ of materials were removed from mixtures of glacial and moraine (MGM) and glacial source areas (GSAs). Recent continuous warning states that the temperature of the Sedongpu gully area exceeded 0 °C from April to July 2012, and the 2017 M_w 6.4 Nyingchi earthquake was critical in the current intense erosion state. © 2025 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences

关键词： Active period Continuous warming Mass wasting Sedongpu gully

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Recent progress in the interfacial polymerization process for CO_(2) separation membrane fabrication

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Frontiers of Chemical Science and engineering 2025年第1期19卷 67-87页

作者： Zhijie Shang Qiangqiang Song Bin Han Jing Ma Dongyang Li Cancan Zhang Xin Li Jinghe Yang Junyong Zhu Wenpeng Li Jing Wang Yatao Zhang School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China Department of Radiation Oncology The First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052China MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation Beijing Key Laboratory of Heat Transfer and Energy ConversionBeijing University of TechnologyBeijing 100124China Singapore Membrane Technology Centre Nanyang Environment and Water Research InstituteNanyang Technological University1 Cleantech Loop637141Singapore State Key Laboratory of Coking Coal Resources Green Exploitation Zhengzhou UniversityZhengzhou 450001China

Nowadays,global warming caused by the increasing levels of CO_(2) has become a serious environmental *** separation technology has demonstrated its promising potential in carbon capture due to its easy operation,energy-efficientness and high *** polymerization process,as a facile and well-established technique for preparing membranes with a thin selective layer,has been widely used for fabricating commercial reverse osmosis and nanofiltration membranes in water treatment *** push forward such an interfacial polymerization process in the research of CO_(2) separation membranes,herein we make a review on the regulation and research progress of the interfacial polymerization membranes for CO_(2) ***,a comprehensive and critical review of the progress in the monomers,nanoparticles and interfacial polymerization process optimization for preparing CO_(2) separation membrane is *** addition,the potential of molecular dynamics simulation and machine learning in accelerating the screen and design of interfacial polymerization membranes for CO_(2) separation are ***,the possible challenges and development prospects of CO_(2) separation membranes by interfacial polymerization process are *** is believed that this review can offer valuable insights and guidance for the future advancement of interfacial polymerization membranes for CO_(2) separation,thereby fostering its development.

关键词： interfacial polymerization CO_(2)separation monomer nanoparticle

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Impact of sulfur-ash reduction treatment on combustion performance, SOx emissions, and flue gas temperatures of lignite coals: experimental and computational study

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environmental Science and Pollution Research 2025年第9期32卷 5574-5588页

作者： Lakhmir, Mansoor Ahmed Akhter, Faheem Ahmed, Jawad Mushtaq, Sidra Arain, Haris Jawad Ahsan, Muhammad Junaid Department of Chemical Engineering Mehran University of Engineering & Technology Jamshoro Pakistan Department of Chemical Engineering Quaid-E-Awam University of Engineering Science and Technology Nawabshah Pakistan Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo315201 China School of Chemistry and Chemical Engineering State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University Shanghai200240 China Energy and Environment Engineering Department Quaid-E-Awam University of Engineering Science and Technology Nawabshah Pakistan

This study is focused on experimental and computational investigation into effects of sulfur-ash reduction treatment over environmental and simulated combustion behavior of lignite coals, specifically Lakhra and Balochistan coals. The simulative investigation was conducted using computational fluid dynamics (CFD). A 2D CFD model of a coal combustor was developed using Ansys FLUENT to analyze the impact of coal treatment, pressure, and coal feeding rate on sulfur oxide (SOx) generation, combustion efficiency, and temperature profiles. The research aims to provide insights into optimizing coal combustion processes for efficient energy production and reduced environmental impact. The results indicate that treating coal leads to an increase in CO2 and H2O production while reducing CO levels, particularly evident in Balochistan coal. Elevated pressure positively affects combustion efficiency, reflected in higher CO2 and H2O mole fractions. The study also reveals that while combustion efficiency slightly decreases with an increase in coal feeding rate, treated coal exhibits a lesser decrease compared to raw coal. SOx generation is significantly reduced up to 55 to 62% after treatment, reaching negligible levels, with both pressure and coal feeding rate influencing SOx generation. Despite similar sulfur content, Lakhra and Balochistan coals exhibit comparable SOx generation due to their similar sulfur ranges. Temperature profiles show that treated coals exhibit higher temperatures during combustion compared to raw coals, with pressure and coal feeding rate directly influencing temperature. Maximum temperature was found in the range of 2555 to 2564 K. While pressure has a minor positive effect on temperature for Lakhra coal, Balochistan coal shows high sensitivity to pressure. These findings highlight the importance of coal treatment and pressure optimization for reducing SOx emissions and improving combustion efficiency in coal-fired power plants. © The Author(s), under ex

关键词： Coal combustion

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