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arXiv 2023年

作者： Liu, Gui-Geng Mandal, Subhaskar Zhou, Peiheng Xi, Xiang Banerjee, Rimi Hu, Yuan-Hang Wei, Minggui Wang, Maoren Wang, Qiang Gao, Zhen Chen, Hongsheng Yang, Yihao Chong, Yidong Zhang, Baile Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore637371 Singapore National Engineering Research Center of Electromagnetic Radiation Control Materials State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technology of China Chengdu610054 China Department of Electrical and Electronic Engineering Southern University of Science and Technology Shenzhen518055 China School of Physics Collaborative Innovation Center of Advanced Microstructures Nanjing University Jiangsu Nanjing210093 China Interdisciplinary Center for Quantum Information State Key Laboratory of Modern Optical Instrumentation ZJU-Hangzhou Global Science and Technology Innovation Center College of Information Science and Electronic Engineering Key Lab. of Advanced Micro/Nano Electronic Devices & Smart Systems of Zhejiang ZJU-UIUC Institute Zhejiang University Hangzhou310027 China Centre for Disruptive Photonic Technologies The Photonics Institute Nanyang Technological University 50 Nanyang Avenue Singapore639798 Singapore

Quantum Hall systems host chiral edge states extending along the one-dimensional boundary of any two-dimensional sample. In solid state materials, the edge states serve as perfectly robust transport channels that produce a quantised Hall conductance;due to their chirality, and the topological protection by the Chern number of the bulk bandstructure, they cannot be spatially localized by defects or disorder. Here, we show experimentally that the chiral edge states of a lossy quantum Hall system can be localized. In a gyromagnetic photonic crystal exhibiting the quantum Hall topological phase, an appropriately structured loss configuration imparts the edge states’ complex energy spectrum with a feature known as point-gap winding. This intrinsically non-Hermitian topological invariant is distinct from the Chern number invariant of the bulk (which remains intact) and induces mode localization via the "non-Hermitian skin effect". The interplay of the two topological phenomena – the Chern number and point-gap winding – gives rise to a non-Hermitian generalisation of the paradigmatic Chern-type bulk-boundary correspondence principle. Compared to previous realisations of the non-Hermitian skin effect, the skin modes in this system have superior robustness against local defects and disorders. Copyright © 2023, The Authors. All rights reserved.

关键词： Topology

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Identification of microplastics in landfill leachate: An underestimated tiny microplastics using Focal Plane Array (FPA)-based Fourier Transform Infrared (FTIR) imaging

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Journal of Environmental sciences 2025年

作者： Shijie Bian Timing Jiang Jingwei Yan Rui Cai Shushan Yuan Wenbo Yu Sha Liang Liang Huang Huabo Duan Mukesh Kumar Awasthi Jiakuan Yang Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin School of Environmental Science & Engineering Huazhong University of Science and Technology (HUST) 1037 Luoyu Road Wuhan 430074 China Hubei Provincial Engineering Laboratory for Solid Waste Treatment Disposal and Recycling Wuhan 430074 China Hubei Provincial Research Center of Water Quality Safety and Water Pollution Control Engineering Technology Huazhong University of Science and Technology Wuhan 430074 China College of Natural Resources and Environment Northwest A&F University Yangling 712100 China State Key Laboratory of Coal Combustion Huazhong University of Science and Technology Wuhan 430074 China

Landfills are significant contributors to the generation of microplastics (MPs) in the environment. However, how to accurately identify and quantify tiny MPs (10-100 μm) in landfill leachate remains an ongoing challenge. The identification of MPs in the leachate of operating and closed landfills was comparatively investigated using attenuated total reflectance-Fourier transform infrared (ATR-FTIR) and focal plane array-based micro-Fourier-transform infrared (FPA-FTIR) imaging. The abundance of MPs detected by FPA-FTIR (70-235 items/L) was two-order magnitude higher than that by ATR-FTIR (2-7 items/L), indicating that FPA-FTIR was more efficient in detecting tiny MPs than ATR-FTIR. Furthermore, the MPs in landfill leachate from 13 different landfills in China, comprising both operating and closed landfills, were determined by FPA-FTIR. The morphology of MPs mainly consists of white fragments, and they are predominantly high-density engineering plastics, which make up 90 % of the total MPs. In operating landfills, the abundance of MPs ranged from 175 to 5320 items/L. The abundance initially increased to a maximum peak at around 15 years of landfill age, and then declined as the landfill continued to operate. In closed landfills, the abundance of MPs showed a decreasing trend with the increasing of landfill closure age. The operational conditions and landfill age significantly affect the quantity of MPs in leachate; however, they do not exert a notable influence on the morphological characteristics of MPs in leachate. This study provided valuable insights for evaluating the transportation and migration behavior of MPs from landfill cells into leachate.

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Research on the Mining Effect of Floor Strata in Deep Coal Seam Mining: A Case Study of #7 Coal Seam at Chazhuang Coal Mine

Research on the Mining Effect of Floor Strata in Deep Coal S...

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China Rock 2020 Conference

作者： Zhang, Wenquan Wu, Xintao Shao, Jianli Ren, Yanghui Wang, Zaiyong College of Energy and Mining Engineering Shandong University of Science and Technology Qingdao266590 China State Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science and Technology Qingdao266590 China Mining Engineering National Experimental Teaching Demonstration Center Shandong University of Science and Technology Qingdao266590 China Central Research Institute China Coal Industry Group Beijing100020 China

Studying the mining effect of floor strata in deep coal seam mining is beneficial for evaluating and relieving the risk of water inrush from the floor. In addition, such research forms the basis for ensuring the support and stability of roadways and chambers in the lower part of the coal seam. By considering the mining of #7 coal seam in the 7600 deep mining area of the Chazhuang coal mine in Feicheng coalfield as the engineering background, this study analyzes the distribution law of mining abutment pressure and the range of failure depth affected by mining using elastic theory. In addition, the stress, strain, and failure states of the floor rock mass affected by mining are comprehensively simulated and studied using the FLAC3D finite difference software combined with field measurement results of rock movement in the lower roadway of the #7 coal seam. The mining effect of the floor is further compared and studied, providing a scientific reference basis for realizing the safe mining of coal in confined water in the deep lower group of the Feicheng coalfield. © Published under licence by IOP Publishing Ltd.

关键词： Coal mines

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Structural Feature and Evolution Mechanism of Arch Structure for Thick Unconsolidated Layer

Research Square

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Research Square 2021年

作者： Yingming, Yang Hengzhong, Zhu Quansheng, Li Kai, Zhang Yongqiang, Zhao State Key Laboratory of Water Resource Protection and Utilization in Coal Mining Beijing102209 China National Energy Investment Group Co. Beijing100011 China State Key Laboratory of Mining Disaster Prevention and Control Co-founded By Shandong Province Ministry of Science and Technology College of Energy and Mining Engineering Shandong University of Science and Technology Qingdao266590 China

Traditionally, the study on the bearing structure of overlying strata mainly focuses on bedrock with the effect of the overlying unconsolidated layer. It simply considered as uniformly loading on the top interface of the bedrock, and ignores the bearing structure for unconsolidated layer. Combined with the geological conditions of shallow burial thick unconsolidated layer in Shendong mining area，the mechanical model of the arch structure for the unconsolidated layers was established. The relationship between the arch height and span was analyzed with theoretical formula and the dynamic evolution mechanism of arch structure was studied with numerical simulation. Besides, formula of arch structure ultimate height was derived. The influence mechanism of arch structure on ground fissures was revealed and criterion was obtained, which was verified by field monitoring data. Furthermore, a classification method of arch structure in thick unconsolidated layers was proposed. © 2021, CC BY.

关键词： Arches

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A Long-focus Camera and Telemetry LiDAR Calibration for Rapid Transit Equipment

A Long-focus Camera and Telemetry LiDAR Calibration for Rapi...

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IEEE International Conference on Robotics and Biomimetics

作者： Bo Fu Yanmei Jiao Jian Bai Jinhui Yuan Xin You Qimeng Tan Yue Wang Rong Xiong State Key Laboratory of Industrial Control and Technology Zhejiang University Hangzhou P.R. China UniTTEC Co. Ltd. Beijing Key Laboratory of Intelligent Space Robotic System Technology and Applications Beijing Institute of Spacecraft System Engineering Beijing P.R. China

ISBN: (纸本)9781665405362

The fused use of the long-focus camera and telemetry LiDAR is necessary for advanced long-distance detection requirements in autonomous driving vehicles and unmanned subways, and the extrinsic parameter calibration is a precondition for multi-sensor fusion use. However, the inaccuracy of long-focus camera detection and low accuracy of data association between LiDAR-camera make the calibration a challenging problem. In this paper, we propose a novel calibration method that treat the detection poses as variables in the optimization framework, which significantly reduces the impact of detection errors on calibration accuracy. Furthermore, we construct 3 error terms to obtain better estimation of the variables, and the designed error terms only require plane-to-plane data association, avoiding incorrect data association that leads to failure in extrinsic parameter estimation. Then we made a full comparison with other methods through real-world experiments, which showed that our method achieves the best calibration result.

关键词： Laser radar Parameter estimation Estimation Cameras Laser modes Calibration Telemetry

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引用

Chinese Automation Congress (CAC)

作者： Wenbiao Mou Hongwei Jin Huanming Wang Minmin Dai Jie Wang Chunhui Zhao Zhejiang Zheneng Taizhou Second Electric Power Generation Co. Ltd. Taizhou China State Key Laboratory of Industrial Control Technology College of Control Science and Engineering Zhejiang University Hangzhou China

ISBN: (数字)9781728176871

ISBN: (纸本)9781728176888

The wide spread of dissimilarity analysis (DISSIM) gives rise to many useful process monitoring models. However, it is only limited to stationary processes. Reliable DISSIM based monitoring methods will encounter challenges of nonstationary behaviors including the time-varying mean or variance. In this work, a stationary subspace decomposition based DISSIM (SSD-DISSIM) model is developed to detect incipient faults sensitively for nonstationary industrial processes. As faults may disappear in time-varying process variations, the key is how to extract information with stationary characteristics from the complex process data. To eliminate the interference caused by the mixed nonstationary signals, the extraction of the stationary components is first conducted by projecting data into a low-dimensional subspace. As a type of distribution-based method, the DISSIM is combined to monitor the extracted stationary components in terms of not only the mean and variance, but also the correlations and distribution. Thus the proposed model can overcome the limitation of DISSIM that arises in nonstationary processes and enhance the sensitivity and reliability of the monitoring. The method effectiveness is demonstrated through the real thermal power plant example.

关键词： Covariance matrices Indexes Silicon Eigenvalues and eigenfunctions Process monitoring Correlation Principal component analysis

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Fault diagnosis based on EEMD and key feature representation with separation of stationary and nonstationary signals 11

Fault diagnosis based on EEMD and key feature representation...

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11th CAA Symposium on Fault Detection, Supervision, and Safety for Technical Processes, SAFEPROCESS 2019

作者： Tian, Feng Zhao, Chunhui Fan, Haidong Zheng, Weijian Sun, Youxian State Key Laboratory of Industrial Control Technology College of Control Science and Engineering Zhejiang University Hangzhou310027 China Zhejiang Energy Group Research Institute Co. Ltd. Hangzhou310000 China

ISBN: (纸本)9781728106816

With the rapid advancement of science and technology, the modern intelligent power plant with large capacity and low energy consumption gradually take place of the traditional power plants. Vibration signal is widely used for fault diagnosis in modern power plant. However, because of nonstationarity, nonlinearity and complexity of vibration signal, it is difficult to analyze the vibration signal directly. To solve the problem, a novel method using vibration signal is proposed in this paper to develop the fault diagnosis model. First, ensemble empirical mode decomposition (EEMD) is employed to decompose the original signal into serval intrinsic mode functions (IMF). To derive rich faulty information, both time domain and frequency domain statistical features are calculated for each IMF. Then fault related key features will be selected to reduce the feature redundancy. In feature selection, we find that faulty information in nonstationary part which may be neglected still plays an important role in fault diagnosis to reveal the trend of the original signal. So Augmented DickyFuller test is utilized to divide the IMFs into stationary part and nonstationary part, and then feature selection is performed in stationary part and nonstationary part respectively. Finally, the key features of both stationary part and nonstationary part are used to develop fault diagnosis model. The efficacy of the proposed method is illustrated using the dataset from the intelligent power plant and the superiorities are shown in comparison with other two method. © 2019 IEEE.

关键词： Failure analysis

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Remediation of sulfamethoxazole contaminated soil using sulfidated zero-valent iron: The overlooked size and sulfur content effects

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Journal of Environmental sciences 2025年

作者： Chenyu Nie Yinshun Dai Zhongkai Duan Yucheng Feng Yi Chen Haijun Chen Chao Song Shuguang Wang Shan Zhao Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and Engineering Shandong University Qingdao 266237 China Shandong Key Laboratory of Environmental Processes and Health School of Environmental Science and Engineering Shandong University Qingdao 266237 China WeiHai Research Institute of Industrial Technology of Shandong University Weihai 264209 China

Sulfamethoxazole (SMX) contamination in farmland disrupts soil micro-ecological functions, posing a risk to soil health and productivity. Sulfidated zero-valent iron (SZVI), a promising green material known for its good reactivity, had been used for soil remediation. However, existing studies often overlooked the effects of particle size and sulfur content on the long-term performance of SZVI and its impact on soil micro-ecological safety. This study employed polysulfide-modified nano, micro-nano, and micron-sized SZVI to investigate how particle size and sulfur content influenced the reactivity and durability, as well as the iron oxide forms and microbial community of soil during the SMX remediation. The results demonstrated that micro-nano sized SZVI (nm-SZVI) exhibited prolonged reactivity, achieving 83.12 %-99.91 % SMX removal over 30 days and maintaining higher levels of soil amorphous and reactive ferrous iron. Although sulfidation improved reactivity, excessive sulfur content reduced removal efficiency and accelerated the conversion to soil crystalline iron forms. Compared to nanoparticles, nm-SZVI fostered microbial diversity and balanced functional bacteria for electron transfer, organic matter utilization, and nutrient cycling. However, the elevated sulfur content in SZVI inhibited the stability of the microbial network. Finally, it was found that SMX underwent isoxazole reduction cleavage and oxidative removal pathways, reducing ecological toxicity. This study provided a new insight into the rational design of SZVI to achieve long-term pollutant removal and ensuring the health and stability of the microbial community by regulating particle size and sulfur content in soil remediation.

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Structural engineering of carbon nitride for enhanced photocatalytic degradation and adsorption of environmental pollutants

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Results in Chemistry 2025年

作者： Meie Zheng Junbo Du Fei Ma Wenwen Li Yujia Shao Xinyue Gao Mengru Guo Hubei Key Laboratory of Resource Utilization and Quality Control of Characteristic Crops College of Life Science and Technology Hubei Provincial Engineering Research Center of Key Technologies in Modern Paper and Hygiene Products Manufacturing School of Mechanical Engineering Hubei Engineering University Xiaogan 432000 China

Since the emergence of the field of photocatalytic water splitting in 2009, the application potential of graphitic carbon nitride (g-C 3 N 4 ) in the field of environmental remediation has been explored. However, to further enhance its adsorption and photocatalytic degradation performance toward typical organic pollutants, a deep understanding of the crucial role of structural regulation is still needed. In response, this review systematically summarizes the cutting-edge strategies for the structural optimization of g-C 3 N 4 , focusing on various methods such as nonmetallic element doping, vacancy defect construction, edge defect regulation, and the synergistic combination of multiple defects. It also delves into the mechanisms by which innovative strategies, including framework structure design and protonation, significantly enhance the ability of a material to capture environmental pollutants such as methylene blue (MB) and its photocatalytic degradation efficiency, revealing the essence of performance enhancement at the micro level. Finally, this review highlights the key achievements of advanced characterization techniques such as electron spin resonance (ESR) and transient photoinduced voltage (TPV) methods. This review aims to provide researchers with an in-depth analysis of the relationship between the structure and properties of g-C 3 N 4 materials, offering a solid theoretical foundation and innovative experimental ideas for their application in environmental pollution control, especially in the development of efficient and sustainable pollutant removal technologies.

关键词： G-C 3 N 4 Structural regulation Methylene blue Photocatalytic degradation Adsorption

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Bisphenol Analogues in Widely Used Polystyrene-Made Food Containers

SSRN

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SSRN 2021年

作者： Zhao, Nan Fang, Shuhong Zhu, Jianqiang Zhao, Meirong Jin, Hangbiao Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province College of Environment Zhejiang University of Technology Hangzhou310014 China College of Resources and Environment Chengdu University of Information Technology Chengdu610225 China Department of Environmental Engineering Taizhou University Taizhou Zhejiang318000 China

Bisphenol analogues (BPs), such as bisphenol A (BPA) and bisphenol S (BPS), are mainly used to produce polycarbonate consumer products. However, the occurrence of BPs in polystyrene-made plastic products, such as white foam take-out containers (WFTOCs), has not been well characterized. In this study, WFTOC samples were collected from restaurants in 21 Chinese cities ( n = 128), 3 Canadian cities ( n = 18), and Krakow (Poland;n = 6), and analyzed them for 20 BPs. BPA was consistently the predominant BP, followed by BPS and bisphenol AF, in WFTOCs from three countries. Very high concentrations of BPA and BPS were detected in WFTOCs from China (2694 and 552 ng/g), compared with Canada (mean 81 and 45 ng/g, respectively) and Poland (95 and 16 ng/g). These BPA levels are even comparable to that reported in polycarbonate baby bottles and milk bottles made of BPA. Other BPs, such as bisphenol TMC (BPTMC;detection frequency 65%, © 2021, The Authors. All rights reserved.

关键词： Phenols

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