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Effect of gradual increase of salt on performance and microbial community during granulation process

Journal of environmental Sciences 2025年第1期147卷 404-413页

作者： Mengfei Wang Junguo He Xiangke Dong Ruimiao Zhang School of Environment Harbin Institute of TechnologyHarbin 150090China State Key Laboratory of Urban Water Resources and Environment Harbin Institute of TechnologyHarbin 150090China School of Civil Engineering Guangzhou UniversityGuangzhou 510006China National Marine Environmental Monitoring Center Dalian 116023China

Salinity was considered to have effects on the characteristics,performance microbial communities of aerobic granular *** study investigated granulation process with gradual increase of salt under different *** identical sequencing batch reactors were operated,while the influent of Ra and Rb was subjected to stepwise increments of NaCl concentrations(0-4 g/L and 0-10 g/L).The presence of filamentous bacteria may contribute to granules formed under lower salinity conditions,potentially leading to granules *** removal efficiency achieved in both reactors although therewas a small accumulation of nitrite in Rb at later *** removal efficiencies of chemical oxygen demand(COD),total nitrogen(TN),and total phosphorus(TP)in Ra were 95.31%,93.70%and 88.66%,while the corresponding removal efficiencies in Rb were 94.19%,89.79%and 80.74%.Salinity stimulated extracellular polymeric substances(EPS)secretion and enriched EPS producing bacteria to help maintain the integrity and stability of the aerobic *** nitrifying bacteria were responsible for NH_(4)^(+)-N and NO_(2)^(-)-N oxidation of salinity systems and large number of denitrifying bacteria were detected,which ensure the high removal efficiency of TN in the systems.

关键词： Aerobic granular sludge(AGS)Salinity Nutrient removal Extracellular polymeric substances(EPS) Microbial community

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Case Study of Bearing Fault Diagnosis Based on Vibration Signal and Fault Injection 14

Case Study of Bearing Fault Diagnosis Based on Vibration Sig...

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

作者： Yu, Lantao Wang, Hao Huang, Shouqing Guo, Zhenwei Zhang, Zhaolin Beijing Key Laboratory of Environment & Reliability Test Technology for Aerospace Mechanical & Electrical Products Beijing Institute of Spacecraft Environment Engineering Beijing China China Academy of Space Technology Beijing China

ISBN: (纸本)9798350329988

In this study, a bearing test platform is designed for several fault injection test pieces. Fault bearings with the inner ring, outer ring, and rolling ball as the fault location and the scratch and crack as the fault mode are comparatively tested under three rotation speeds of 1000, 1500, and 3000 rpm, respectively. The fault characteristic frequency analysis is conducted on the vibration signal to determine the fault location and evaluate its severity. The analysis results show that the proposed method can diagnose the fault location and severity of the fault bearing, and the results are consistent with the actual scenario. © 2023 IEEE.

关键词： Vibration analysis

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Satellite breakup behaviors and model under the hypervelocity impact and explosion:A review

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Defence technology（防务技术） 2023年第9期27卷 284-307页

作者： Si-yuan Ren Zi-zheng Gong Qiang Wu Guang-ming Song Qing-ming Zhang Pin-liang Zhang Chuan Chen Yan Cao Beijing Institute of Spacecraft Environment Engineering China Academy of Space TechnologyBeijing100094China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing100081China

The primary causes of satellite breakups are hypervelocity impact and explosion,the research on satellite breakup can be used not only to evaluate the influence of breakup event on the space environment,but also to trace whether the satellite has been deliberately *** is of great significance in both civil and military *** study of satellite breakup behaviors and model is reviewed to summarize the research progress and insufficiency in recent decades,including the satellite breakup experiment,measurement and characterization of fragments,distribution characteristics of breakup fragments,satellite breakup model,*** classical studies are introduced in detail,and the limitations of the current research are pointed *** to the current research results,the contemporary challenges and future directions for satellite breakup study are *** research on satellite breakup is developing in two directions:the miniaturization of satellite size and the complexity of satellite *** study on satellite breakup needs to be explored and deepened on improving the experimental launch speed,expanding the model application range and breakup revealing the results under combined effect of impact and explosion.

关键词： Satellite breakup Space environment Distribution characteristics Hypervelocity impact Explosion

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Degradation of metoprolol by UV/sulfite as an advanced oxidation or reduction process:The significant role of oxygen

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Journal of environmental Sciences 2023年第6期128卷 107-116页

作者： Ying Cao Juan Li Yanxin Zhao Yumeng Zhao Wei Qiu Suyan Pang Jin Jiang Advanced Interdisciplinary Institute of Environment and Ecology Beijing Normal University at ZhuhaiZhuhai 519087China State Key Laboratory of Urban Water Resource and Environment School of EnvironmentHarbin Institute of TechnologyHarbin 150090China Key Laboratory of Songliao Aquatic Environment Ministry of EducationSchool of Municipal and Environmental EngineeringJilin Jianzhu UniversityChangchun 130118China Key Laboratory for City Cluster Environmental Safety and Green Development of the Ministry of Education Institute of Environmental and Ecological EngineeringGuangdong University of TechnologyGuangzhou 510006China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China

The degradation of metoprolol(MTP)by the UV/sulfite with oxygen as an advanced reduction process(ARP)and that without oxygen as an advanced oxidation process(AOP)was comparatively studied *** degradation of MTP by both processes followed the first-order rate law with comparable reaction rate constants of 1.50×10^(-3)sec^(−1)and 1.20×10^(-3)sec^(−1),*** experiments demonstrated that both e^(−)_(aq)and H·played a crucial role in MTP degradation by the UV/sulfite as an ARP,while SO_(4)^(·−)was the dominant oxidant in the UV/sulfite *** degradation kinetics of MTP by the UV/sulfite as an ARP and AOP shared a similar pH dependence with a minimum rate obtained around pH *** results could be well explained by the pH impacts on the MTP speciation and sulfite *** six transformation products(TPs)were identified from MTP degradation by the UV/sulfite ARP,and two additional ones were detected in the UV/sulfite *** benzene ring and ether groups of MTP were proposed as the major reactive sites for both processes based on molecular orbital calculations by density functional theory(DFT).The similar degradation products of MTP by the UV/sulfite process as an ARP and AOP indicated that e^(−)_(aq)/H·and SO_(4)^(·−)might share similar reaction mechanisms,primarily including hydroxylation,dealkylation,and H *** toxicity of MTP solution treated by the UV/sulfite AOP was calculated to be higher than that in the ARP by the Ecological Struc-ture Activity Relationships(ECOSAR)software,due to the accumulation of TPs with higher toxicity.

关键词： UV/sulfite Advanced reduction process(ARP) Advanced oxidation process(AOP) Metoprolol Degradation products Toxicity

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Insights into the deformation mechanisms of an Al1Mg0.4Si alloy at cryogenic temperature:An integration of experiments and crystal plasticity modeling

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Journal of Materials Science & technology 2024年第33期200卷 69-82页

作者： Youhong Peng Danyang Li He Wu Kesong Miao Chenglu Liu Li Wang Wei Liu Chao Xu Lin Geng Peidong Wu Guohua Fan School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China Laboratory for Space Environment and Physical Sciences Harbin Institute of TechnologyHarbin 150001China Key Laboratory for Light-Weight Materials Nanjing Tech UniversityNanjing 211816China

In this work,we investigated the mechanical properties and corresponding deformation mechanisms of an Al1Mg0.4Si alloy,which exhibited significantly higher strength and outstanding strain hardening capacity at 77 K compared to its counterparts at 298 *** deformation mechanisms responsible for the excellent strength-ductility synergy and extraordinary strain hardening capacity at cryogenic temperature were elucidated through a combined experimental and simulation *** results reveal the presence of numerous slip traces and microbands throughout grain surfaces during deformation at 298 K,whereas at 77 K,vague grain surfaces dominate,indicating the simultaneous operation of multiple slip *** electron microscopy(TEM)analysis using the two-beam diffraction technique demonstrates the presence of dislocations with several different Burgers vectors inside a grain at cryogenic temperature,confirming the activation of multiple slip *** accumulation of dislocations facilitated by these multiple slip systems,combined with the high dislocation density,contributes to strain hardening and remarkable uniform elongation at 77 K.A modified dislocation density-based crystal plasticity model,incorporating the effect of grain boundary hardening(GBH)and temperature,was developed to gain a better understanding of the underlying mechanisms governing alloy’s strength and *** GBH effect significantly enhances statistically stored dislocation(SSD)density and screw dislocation proportion,which promote homogeneous deformation and enhance strain hardening capacity at cryogenic *** findings deepen the understanding of plastic deformation at cryogenic temperatures and pave the way for the development of ultrahigh-performance metallic materials for cryogenic applications.

关键词： Aluminum alloy Cryogenic temperature Grain boundary hardening effect Deformation mechanism Crystal plasticity modeling

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Recent progress in carbene-catalyzed fluoroalkylation

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Science China Chemistry 2024年第8期67卷 2448-2460页

作者： Bei Zhang Xuan Zhang Jian Wang Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control Collaborative Innovation Center of Atmospheric Environment and Equipment TechnologySchool of Environmental Science and EngineeringNanjing University of Information Science and TechnologyNanjing 210044China School of Pharmaceutical Sciences Tsinghua UniversityBeijing 100084China

The fluoroalkyl fragment plays a vital role in various fields such as pharmaceuticals and materials science, and has a significant impact on human life not only on the present but also in the future. The insertion of fluoroalkyl groups into the chemical skeletons can cause considerable alternations in the chemical, physical and biological properties of molecules, which has attracted numerous scientists from different fields. This review focuses on N-heterocyclic carbene(NHC)-catalyzed fluoroalkylation reactions, providing a detailed analysis and summary of the achievements in the past two decades. Many successful examples clearly indicate that NHCs can catalyze the tranformation of fluoroalkylation reagents with various electronic characteristics, whether electrophilic, nucleophilic, or radical precursors. Herein, the fluoroalkylation reactions are classified based on different catalytic modes of NHCs: Lewis base catalysis, Umploung catalysis, radical catalysis and others. Meanwhile, by refining and systematically studying the contribution of NHC catalysis in fluoroalkylation reactions, this review is expected to provide valuable insights and enlightenment for related fields.

关键词： N-heterocyclic carbene fluoroalkylation radical catalysis

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Time-dependent color-tunable room temperature phosphorescence from unusual conformational transitions in phenothiazine polymers under UV irradiation

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Science China Chemistry 2025年第3期68卷 1091-1098页

作者： Jiwen Lu Yifan Niu Chanjuan Jin Chengheng Wu Hanyu Wang Yan Guan Ping Wang Xinghe Fan Key Lab of Environment-Friendly Chemistry and Application of Ministry of Education Key Laboratory of Polymeric Materials and Application Technology of Hunan ProvinceKey Laboratory of Advanced Functional Polymer Materials of CollegesUniversities of Hunan ProvinceCollege of ChemistryXiangtan UniversityXiangtan 411105China Beijing National Laboratory for Molecular Sciences Key Laboratory of Polymer Chemistry and Physics of Ministry of EducationCenter for Soft Matter Science and EngineeringCollege of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

Achieving color-tunable room-temperature phosphorescence(RTP),especially including blue RTP from a single-component polymer still faces a formidable ***,we wisely choose conformation-dependent phenothiazine with trifluoromethyl substituent as the side group of the phosphor monomer(Cz PT)and then copolymerize it with N-isopropylacrylamide(NIPAM)through photopolymerization to obtain polymers PPCz ***-dependent color-tunable phosphorescence from unusual quasi-equatorial(eq)to quasi-axial(ax)conformers are obtained,and the RTP color changes from orange(550 nm)to blue(470 nm)with phosphorescence lifetime up to 0.96 *** theoretical calculations confirm that the quasi-axial conformer is the preferred structure that facilitates the formation of intramolecular hydrogen bonds on the trifluoromethyl *** EPR spectra illustrate that the persistent UV irradiation generates radical cations to induce the conformational transitions first,followed by photopolymerization immobilizing the ax conformation in PPCz *** of data encryption and anti-counterfeiting are fabricated to show prompt and delayed multicolor *** work affords a simple and feasible avenue for two-dimensional color tunable room temperature phosphorescence from a single-component polymer.

关键词： polymeric room temperature phosphorescence color-tunable phosphorescence conformation-dependent time-dependent blue phosphorescence

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A Remaining Useful Life Prediction Method for Hydrogen Fuel Cell Based on a Multi-phase Wiener Process-based Degradation Model 6

A Remaining Useful Life Prediction Method for Hydrogen Fuel ...

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6th International Conference on System reliability and Safety engineering, SRSE 2024

作者： Jiang, Chen Yu Chen, Qiang Lei, Baimao He, Zhanyu China Electronic Product Reliability and Environmental Testing Research Institute China CEPREI Laboratory Guangdong Provincial Key Laboratory of Electronic Information Products Reliability Technology Guangzhou China China Electronic Product Reliability and Environmental Testing Research Institute China CEPREI Laboratory Ministry of Industry and Information Technology Key Laboratory of Quality and Reliability Engineering Technology of Civil Aircraft and Aero-Engine Guangzhou China

ISBN: (纸本)9798350356083

As an efficient and environmentally friendly electrochemical energy converter, hydrogen fuel cells are widely used in many areas. Nevertheless, the large-scale commercialization of fuel cells remains hindered by durability concerns. Condition-based maintenance (CBM) strategies, leveraging performance degradation analysis and remaining useful life (RUL) prediction, have shown promise in enhancing cell longevity. However, the individual differences and performance recovery caused by fuel cell shutdown inspection pose significant obstacles to achieving precise RUL estimates. Hence, in the paper, a multi-phase Wiener process-based degradation model was proposed for performance degradation modeling and RUL prediction of hydrogen fuel cells. The conventional stochastic process-based model was extended to a multi-stage degradation expression for describing the voltage recovery effect of hydrogen fuel cells due to planned shutdown. A case study, involving a hydrogen fuel cell, was presented to validate the applicability of the proposed method. The analysis results indicated that the proposed method in the paper significantly improves the accuracy of RUL prediction with small amount of operational data compared to conventional methods, providing valuable engineering applications. © 2024 IEEE.

关键词： Stochastic systems

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Post-modification engineering of cerium metal-organic frameworks for efficient visible light-driven water oxidation

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Rare Metals 2024年第11期43卷 5802-5812页

作者： Lin-Zhu Zhang Lu Chen Gui-Yang Yan Ruo-Wen Liang Hong-Hui Ou Fujian Provincial Key Laboratory of Featured Biochemical and Chemical Materials Fujian Province University Key Laboratory of Green Energy and Environment CatalysisNingde Normal UniversityNingde 352100China School of Chemical Engineering and Technology Xi'an Jiaotong UniversityXi'an 710049China

Metal-organic frameworks(MOFs)are highly desirable for promising photocatalytic water splitting,but their practical application is greatly limited due to their unstable chemical properties and insufficient visible light response as well as low charge-carries utilization,especially in photocatalytic O_(2)***,we present a post-modification engineering to modulate cerium metalorganic frameworks(Ce-MOFs)for realizing efficient photocatalytic water oxidation to liberate O_(2)by visible *** one-step partial oxidation strategy is adopted to modify pristine Ce-MOFs,yielding the new Ce-MOFs(MV-Ce-MOFs)with mixed valence of Ce^(3+)/Ce^(4+).Creating the Ce nodes of a mixed valence state can effectively extend the optical absorption to the visible region,expose more catalytically active sites and inhibit the recombination of photoinduced ***,the MV-Ce-MOFs exhibit high activity for photocatalytic O_(2)evolution under visible light,manifesting an impressive1.6%apparent quantum efficiency(AQY)under monochromatic irradiation of 405 *** regulation engineering of MOF metal node valence heralds a new paradigm for designing MOF-based photocatalysts.

关键词： Cerium metal-organic frameworks Partial oxidation Mixed valence Photocatalytic water oxidation Oxygen evolution

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Bioremediation of petroleum-contaminated soil based on both toxicity risk control and hydrocarbon removal—progress and prospect

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environmental Science and Pollution Research 2024年第50期31卷 59795-59818页

作者： Wu, Manli Feng, Shuang Liu, Zeliang Tang, Shiwei Key Laboratory of Environmental Engineering of Shaanxi Province School of Environmental and Municipal Engineering Xi’an University of Architecture and Technology Xi’an710055 China Key Laboratory of Northwest Water Resources Environment and Ecology Ministry of Education Xi’an710055 China

Petroleum contamination remains a worldwide issue requiring cost-effective bioremediation techniques. However, establishing a universal bioremediation strategy for all types of oil-polluted sites is challenging. This difficulty arises from the heterogeneity of soil textures, the complexity of oil products, and the variations in local climate and environment across different oil-contaminated regions. Several factors can impede bioremediation efficacy: (i) differences in bioavailability and biodegradability between aliphatic and aromatic fractions of crude oil;(ii) inconsistencies between hydrocarbon removal efficiency and toxicity attenuation during remediation;(iii) varying adverse effect of aliphatic and aromatic fractions on soil microorganisms. This review examines the ecotoxicity risk of petroleum contamination to soil fauna and flora. It also discusses three primary bioremediation strategies: biostimulation with nutrients, bioaugmentation with petroleum degraders, and phytoremediation with plants. Based on current research and state-of-the-art challenges, we highlighted future research scopes should focus on (i) exploring the ecotoxicity differentiation of aliphatic and aromatic fractions of crude oil, (ii) establishing unified risk factors and indicators for evaluating oil pollution toxicity, (iii) determining the fate and transformation of aliphatic and aromatic fractions of crude oil using advanced analytical techniques, and (iv) developing combined bioremediation techniques that improve petroleum removal and ecotoxicity attenuation. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Aromatization

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