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Augmented machine learning for sewage quality assessment with limited data

environmental Science and Ecotechnology 2025年第1期23卷 193-203页

作者： Jia-Qiang Lv Wan-Xin Yin Jia-Min Xu Hao-Yi Cheng Zhi-Ling Li Ji-Xian Yang Ai-Jie Wang Hong-Cheng Wang State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin150090China School of Civil and Environmental Engineering Harbin Institute of Technology ShenzhenShenzhen518055China College of the Environment Liaoning UniversityShenyang110036China

Physical,chemical,and biological processes within sewers significantly alter sewage composition during *** leads to the formation of sulfide and methanedcompounds that contribute to sewer corrosion and greenhouse gas *** modeling of these compounds is essential for effective sewer management,but the development of machine learning(ML)models is hindered by differences in data accessibility and sampling frequencies of water quality *** we present a mechanistically enhanced hybrid(ME-Hybrid)model that combines mechanistic modeling with data-driven *** model harmonizes datasets with varying sampling frequencies and generates synthetic samples for ML training,thereby enhancing the monitoring of methane and sulfide in *** optimal MEHybrid model integrates the backpropagation neural network with mechanistic frequency *** demonstrate that the ME-Hybrid model outperforms pure ML and linear interpolation in capturing fluctuating trends and extremes of sulfide concentrations,achieving a coefficient of determination(R2)of *** samples generated through mechanistic augmentation closely approximate real samples in modeling performance,statistical distribution,and data *** enables the model to maintain high predictive accuracy(R2>0.76)for sulfide even when trained on only 50%of the ***,the ME-Hybrid model successfully assesses sewer methane concentrations with an R2 of 0.94,validating its applicability and generalization *** results provide a reliable methodological framework for modeling and prediction under data *** facilitating better monitoring and management of sewer systems,the ME-Hybrid model aids in the development of strategies that minimize environmental impacts,enhance urban resilience,and ultimately lead to sustainable urban water systems.

关键词： Machine learning Hybrid model Mechanistic augmentation Sewer system Sulfide and methane

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Decomplexation of Cu-1-hydroxyethylidene-1,1-diphosphonic acid by a three-dimensional electrolysis system with activated biochar as particle electrodes

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Journal of environmental Sciences 2023年第2期124卷 630-643页

作者： Xing Wang Zilong Zhao Hongjie Wang Feng Wang Wenyi Dong School of Civil and Environmental Engineering Harbin Institute of Technology ShenzhenShenzhen 518055China Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control Shenzhen 518055China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China

The feasibility of decomplexation removal of typical contaminants in electroplating wastewater,complexed Cu(Ⅱ)with 1-hydroxyethylidene-1,1-diphosphonic acid(Cu-HEDP),was first performed by a three-dimensional electrode reactor with activated biochar as particle *** the case of 50 mg/L Cu-HEDP,Cu(Ⅱ)removal(90.7%)and PO_(4)^(3−)conversion(34.9%)were achieved under the conditions of electric current 40 mA,initial pH 7,acid-treated almond shell biochar(AASB)addition 20 g/L,and reaction time 180 min,with second-order rate constants of 1.10×10^(−3) and 1.94×10^(−5) min^(−1) *** growing chelating effect between Cu(II)and HEDP and the comprehensive actions of adsorptive accumulation,direct and indirect oxidation given by particle electrodes accounted for the enhanced removal of Cu-HEDP,even though the mineralization of HEDP was mainly dependent on anode *** performance attenuation of AASB particle electrodes was ascribed to the excessive consumption of oxygen-containing functionalities during the reaction,especially acidic carboxylic groups and quinones on particle electrodes,which decreased from 446.74 to 291.48μmol/g,and 377.55 to 247.71μmol/g,*** on the determination of adsorption behavior and indirect electrochemical oxidation mediated by in situ electrogenerated H_(2)O_(2) and reactive oxygen species(e.g.,•OH),a possible removal mechanism of Cu-HEDP by three-dimensional electrolysis was further proposed.

关键词： Cu-HEDP Electrochemical oxidation Particle electrode Reaction characteristics Removal mechanism

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Synthesis,crystallographic characterization,and potential application of fullerene anisole derivatives as nitrocellulose stabilizer

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Defence technology（防务技术） 2023年第6期24卷 164-172页

作者： Jie Xiong Bo Jin Xue-mei Yu Ling Liao Ru-fang Peng State Key Laboratory of Environment-friendly Energy Materials School of Materials Science and EngineeringSouthwest University of Science and TechnologySichuanMianyang621010China

A series of fullerene anisole derivative stabilizers was synthesized by nucleophilic substitution reaction using hexachlorofullerene and benzyl alcohol as raw materials to extend the service duration of nitrocellulose(NC)-based ***-crystal X-ray diffraction,nuclear magnetic resonance,highresolution mass spectrometry,Fourier transform infrared(FT-IR)spectroscopy,and UV-Vis spectroscopy were used to characterize the structures of the synthesized fullerene anisole derivative *** violet,differential scanning calorimetry test,isothermal weight loss,vacuum stability test,and adiabatic accelerated test were used to study their compatibility with NC and their ability to stabilize *** results show that the designed and synthesized novel fullerene anisole derivative stabilizer has good compatibility with NC,and their overall stabilizing effects on NC are better than those of the traditional stabilizers,diphenylamine(DPA),and N,N’-dimethyl-N,N’-diphenylurea(C2).The stabilizing effects was ranked as:3b>2d>2a>2c>C2>2b>DPA>*** addition,FT-IR analysis and electron spin resonance spectroscopy were applied to explore the stability mechanism of fullerene-based stabilizers to *** results reveal that the new fullerene stabilizer can adsorb and effectively eliminate the nitrogen oxide free radicals generated by NC degradation;therefore,it can forbid the autocatalytic degradation of NC and stabilize NC.

关键词： Fullerene Nitrocellulose Stability Propellant Mechanism

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Vector Characterization Method of Multiple Stress Acceleration Factors for High-reliability Electronic Products 14

Vector Characterization Method of Multiple Stress Accelerati...

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14th International Conference on reliability, Maintainability and Safety, ICRMS 2023

作者： Wu, Jian-Guo Yu, Rong-Gang Shi, Chang-Wei Feng, Guo-Lin Science and Technology on Reliability and Environment Engineering Laboratory Beijing Institute of Structure and Environment Engineering Beijing100076 China Beijing Institute of Structure and Environment Engineering Beijing100076 China

ISBN: (纸本)9798350329988

Accelerated life testing is one of the rapid verification methods for highly reliable electronic products in complex service environments. Existing acceleration models primarily rely on single or doable stress, making it difficult to meet the reliability improvement needs of highly reliable electronic products in terms of fault excitation efficiency and service environment simulation accuracy. This article proposes a vector representation method for the multi stress acceleration factor of highly reliable electronic products based on the random vector theory and product failure time model, considering the multi stress coupling effect in the product failure mechanism to improve the accuracy of the multi stress acceleration model when describing the product failure mechanism. The method was applied to statistically analyze the temperature, humidity, and electrical stress constant acceleration life test data of power control components under 5 different stress combinations. The predicted results of the model showed an error of less than 10% compared to the test results, verifying the scientific and feasible vector characterization of multi stress acceleration factors in highly reliable electronic products and providing a method for the research of multi stress acceleration test technology in electronic products. © 2023 IEEE.

关键词： accelerated life test acceleration model multidimensional vector multiple stresses

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A Survey of Neural Network Robustness Assessment in Image Recognition

arXiv

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arXiv 2024年

作者： Wang, Jie Ai, Jun Lu, Minyan Su, Haoran Yu, Dan Zhang, Yutao Zhu, Junda Liu, Jingyu The Key Laboratory on Reliability and Environment Engineering Technology School of Reliability and Systems Engineering Beihang University China

In recent years, there has been significant attention given to the robustness assessment of neural networks. Robustness plays a critical role in ensuring reliable operation of artificial intelligence (AI) systems in complex and uncertain environments. Deep learning's robustness problem is particularly significant, highlighted by the discovery of adversarial attacks on image classification models. Researchers have dedicated efforts to evaluate robustness in diverse perturbation conditions for image recognition tasks. Robustness assessment encompasses two main techniques: robustness verification/ certification for deliberate adversarial attacks and robustness testing for random data corruptions. In this survey, we present a detailed examination of both adversarial robustness (AR) and corruption robustness (CR) in neural network assessment. Analyzing current research papers and standards, we provide an extensive overview of robustness assessment in image recognition. Three essential aspects are analyzed: concepts, metrics, and assessment methods. We investigate the perturbation metrics and range representations used to measure the degree of perturbations on images, as well as the robustness metrics specifically for the robustness conditions of classification models. The strengths and limitations of the existing methods are also discussed, and some potential directions for future research are provided. Copyright © 2024, The Authors. All rights reserved.

关键词： Image recognition

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High strength-ductility synergy in refractory multi-principal element alloys via special deformation mechanisms and dislocation behaviors

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Rare Metals 2025年第1期44卷 608-622页

作者： Zhi-Wen Li Bao-Xian Su Liang Wang Chen Liu Zhe Li Qing-Da Zhang Bin-Bin Wang Xiang Xue Rui-Run Chen Yan-Qing Su National Key Laboratory for Precision Hot Processing of Metals School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China Zhengzhou Research Institute Harbin Institute of TechnologyZhengzhou 450000China Laboratory for Space Environment and Physical Sciences Harbin Institute of TechnologyHarbin 150001China

Ti-Zr-Nb refractory multi-principal element alloys(RMPEAs)have attracted increased attention due to their excellent mechanical *** this study,(TiZr)_(80-x)Nb_(20)Mo_(x)(x=0,5 and 10)alloys were designed,and the intrinsic conflicts between strength and ductility were overcome via composition optimization and *** causes of the superior strength-ductility synergy were investigated in terms of their deformation mechanism and dislocation *** results show that the strength improvement can be attributed to the deformation mechanism transition caused by local chemical fluctuations and lattice ***,the slip band widths decrease after Mo addition,and the measured slip traces in the fracture samples are associated with high-order{112}and{123}slip ***,the grain refinement achieved via recrystallization promotes multi-slip system activation and shortens the slip-band spacing,which reduces the stress concentration and inhibits crack source formation,thereby allowing the alloy to ensure sufficient ***,the Ti_(35)Zr_(35)Nb_(20)Mo_(10)alloy annealed at 900℃ exhibits high yield strength and *** findings provide a new strategy for designing high-strength RMPEAs and addressing room-temperature brittleness.

关键词： Refractory multi-principal element alloy Mechanical property Strengthening mechanism Deformation substructure Dislocation behavior

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Insights into the mechanism of the deterioration of mainstream partial nitritation/anammox under low residual ammonium

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Journal of environmental Sciences 2023年第4期126卷 29-39页

作者： Yandong Yang Yiming Jiang Yanan Long Jiarui Xu Changqing Liu Liang Zhang Yongzhen Peng School of Environmental and Municipal Engineering Qingdao University of TechnologyQingdao 266033China National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery EngineeringBeijing University of TechnologyBeijing 100124China

Residual ammonium is a critical parameter affecting the stability of mainstream partial nitritation/anammox(PN/A), but the underlying mechanism remains unclear. In this study,mainstream PN/A was established and operated with progressively decreasing residual ammonium. PN/A deteriorated as the residual ammonium decreased to below 5 mg/L, and this was paralleled by a significant loss in anammox activity in situ and an increasing nitrite oxidation rate. Further analysis revealed that the low-ammonium condition directly decreased anammox activity in situ via two distinct mechanisms. First, anammox bacteria were located in the inner layer of the granular sludge, and thus were disadvantageous when competing for ammonium with ammonium-oxidizing bacteria(AOB) in the outer layer. Second, the complete ammonia oxidizer(comammox) was enriched at low residual ammonium concentrations because of its high ammonium affinity. Both AOB and comammox presented kinetic advantages over anammox bacteria. At high residual ammonium concentrations,nitrite-oxidizing bacteria(NOB) were effectively suppressed, even when their maximum activity was high due to competition for nitrite with anammox bacteria. At low residual ammonium concentrations, the decrease in anammox activity in situ led to an increase in nitrite availability for nitrite oxidation, facilitating the activation of NOB despite the dissolved oxygen limitation(0.15–0.35 mg/L) for NOB persisting throughout the operation. Therefore, the deterioration of mainstream PN/A at low residual ammonium was primarily triggered by a decline in anammox activity in situ. This study provides novel insights into the optimized design of mainstream PN/As in engineering applications.

关键词： Mainstream partial nitritation/anammox Residual ammonium Granular sludge Comammox

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Valence electron matching law for MXene-based single-atom catalysts

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Journal of Energy Chemistry 2025年第2期101卷 641-650,I0013页

作者： Pei Song Yuhang Zhou Zishan Luo Hang Zhang Xi Sun Sen Lu Zepeng Jia Hong Cui Weizhi Tian Rong Feng Lingxia Jin Hongkuan Yuan School of Mechanical Engineering Shaanxi University of TechnologyHanzhong 723001ShaanxiChina Shaanxi Key Laboratory of Industrial Automation Shaanxi University of TechnologyHanzhong 723001ShaanxiChina Shaanxi Key Laboratory of Catalysis College of Chemical & Environment ScienceShaanxi University of Technology Hanzhong 723001ShaanxChina School of Physical Science and Technology Southwest UniversityChongqing 400715China

Single-atom catalysts(SACs)have attracted considerable interest in the fields of energy and environmental science due to their adjustable catalytic *** this study,we investigated the matching of valence electron numbers between single atoms and adsorbed intermediates(O,N,C,and H)in MXene-anchored SACs(M-Ti_(2)C/M-Ti_(2)CO_(2)).The density functional theory results demonstrated that the sum of the valence electron number(VM)of the interface-doped metal and the valence electron number(VA)of the adsorbed intermediates in M-Ti_(2)C followed the 10-valence electron matching ***,based on the 10-valence electron matching law,we deduced that the sum of the valence electron number(k)and VMfor the molecular adsorption intermediate interactions in M-Ti_(2)CO_(2)adhered to the 11-valence electron matching *** repulsion between the interface electrons in M-Ti_(2)CO_(2)and H_(2)O weakened the adsorption of intermediates,Furthermore,we applied the 11-valence electron matching law to guide the design of catalysts for nitrogen reduction reaction,specifically for N_(2)→NNH conversion,in the MTi_(2)CO_(2)*** sure independence screening and sparsifying operator algorithm was used to fit a simple three-dimensional descriptor of the adsorbate(R_(2)up to 0.970)for catalyst *** study introduced a valence electron matching principle between doped metals(single atoms)and adsorbed intermediates(atomic and molecular)for MXene-based catalysts,providing new insights into the design of high-performance SACs.

关键词： Density functional theory Nitrogen reduction reaction Sure independence screening and sparsifying operator Valence electron matching law

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Oxygen vacancy-rich CoMoO4/Carbon nitride S-scheme heterojunction for boosted photocatalytic H_(2)production:Microstructure regulation and charge transfer mechanism

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Journal of Materials Science & technology 2024年第31期198卷 176-185页

作者： Jiani Qin Yanli Dong Xiaojuan Lai Bo Su Bao Pan Chuanyi Wang Sibo Wang School of Environmental Science and Engineering Shaanxi University of Science and TechnologyXi'an 710021China Key Laboratory of Chemical Additives for China National Light Industry School of Chemistry and Chemical EngineeringShaanxi University of Science and TechnologyXi'an 710021China State Key Laboratory of Photocatalysis on Energy and Environment College of ChemistryFuzhou UniversityFuzhou 350116China

Developing highly efficient S-scheme photocatalysts is a subject of immense interest for harnessing solar energy towards sustainable hydrogen ***,a novel S-scheme heterojunction of oxygen vacancy-rich CoMoO_(4)/CN(CMO/CN)photocatalyst was rationally constructed through loading CoMoO_(4)nanorods on carbon nitride(CN)nanosheets via a direct one-pot calcination *** CMO/CN S-scheme heterojunction exhibited enhanced surface area,fine CN dispersion,rich oxygen vacancies,and accelerated charge separation/transfer efficiency,which were conducive to improving photocatalytic H_(2)evolution *** note,the optimal 3%CMO/CN sample displayed the highest H_(2)production rate of 8.35 mmol g^(-1)h^(-1),which is 4.6 folds that of pristine *** situ irradiated X-ray photoelectron spectroscopy(XPS)and electron paramagnetic resonance(EPR)characterizations confirmed the S-scheme charge transfer path between CN and CMO,which greatly promoted spatial charge *** functional theory(DFT)calculations together with contact angle tests revealed the reduced activation energies for H_(2)O dissociation and enhanced hydrophilicity of the CMO/*** CMO/CN photocatalysts also presented high stability and fine *** work may provide insights into the combination of defect engineering and heterojunction designing for high-efficiency solar-to-chemical energy conversion.

关键词： S-scheme CoMoO_(4) Carbon nitride Oxygen vacancy Photocatalysis

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High density sampling reveals the spatiotemporal characteristics of microbial communities in a full-scale municipal wastewater treatment plant

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Frontiers of environmental Science & engineering 2025年第2期19卷 135-149页

作者： Zhaoyang Li Liang Zhang Jinghan Li Da Kang Jialin Li Shujun Zhang Xiaoyu Han Bin Ma Yongzhen Peng National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery EngineeringBeijing University of TechnologyBeijing 100124China Beijing Drainage Group Co. Ltd.(BDG)Beijing 100022China College of Environment and Ecology Institute of Tropical Agriculture and ForestryHainan UniversityHaikou 570228China

Insights into the microbial communities in municipal wastewater treatment plants(WWTPs)are critical for the optimization of biological nutrient removal ***,our understanding about the spatiotemporal characteristics of the microbial communities in WWTPs remains *** the present study,264 samples were collected biweekly from four spatially independent corridors in a typical municipal *** annual compositional and metagenomic characteristics were investigated based on multiple ecological indicators using statistical *** results revealed that the microbial community compositions from the four corridors showed significantly high similarities,as revealed by the statistical analysis at the operational taxonomic unit(OTU)*** with the OTU level results,the functionality of the microbial communities in the four independent corridors also showed significant *** comparison,the dynamics of the microbial community over the year showed two successional peaks of the microbial communities with the spatial similarity,and this resulted in three alternative stable states of the microbial communities in a calendar *** microbial communities only drifted in July and November,suggesting an uneven community succession pattern driven by seasonal variation in environmental *** functional characteristics were found to be relatively conservative compared to the microbial community succession,which revealed the decoupling between the composition and functionality of the microbial community in the municipal *** present study provides an in-depth overview of the microbial communities in a municipal WWTP and will be useful for the establishment of the connection between ecological characteristics and the operational stability of WWTPs.

关键词： Activated sludge Microbial community Spatial similarity Successional pattern Metagenomics

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