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Seasonal variations of microbial community and.antibiotic resistome in a suburb d.inking water d.stribution system in a northern Chinese city

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Journal of Environmental Sciences 2023年第5期127卷 714-725页

作者： Yanchu Ke Wenjun sun Zibo Jing Zhinan Zhao Shuguang Xie State Key Joint laboratory of Environmental Simulation and.Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China School of Environment Tsinghua UniversityBeijing 100084China Research Institute for Environmental Innovation(Suzhou)Tsinghua Suzhou 215163China

Antibiotic resistance genes(ARGs)are an emerging issue for d.inkingwater ***,the seasonal variation of ARGs in d.inking water d.stribution systems(d.d.)is still *** work revealed.the tempo-spatial changes of microbial community,ARGs,mobile genetic elements(MGEs)co-occurring with ARGs,ARG hosts in d.d. bulk water by means of metagenome *** microbial community and.antibiotic resistome varied.with sampling season and.***,ammonia,chlorite and.total plate count(TPC)d.ove the variations of microbial community ***,environmental parameters(total organic carbon(TOC),chlorite,TPC and.hard.ess)shifted.antibiotic *** and.MGEs co-occurring with ARGs showed.higher relative abund.nce in summer and.autumn,which might be attributed.to d.tached.pipe *** particular,ARG-bacitracin and.plasmid.were the pred.minant ARG and.MGE,*** hosts changed.with season and.site and.were more d.verse in summer and.*** winter and.spring,limnohabitans and.Mycobacterium were the major ARG hosts as well as the d.minant genera in microbial *** ad.ition,in summer and.autumn,high relative abund.nce of Achromobacter and.Stenotrophomonas were the hosts harboring many kind. of ARGs and.MGEs at site in a resid.ntial zone(0.4 km from the water treatment plant).Compared.with MGEs,microbial community had.a greater contribution to the variation of antibiotic *** work gives new insights into the d.namics of ARGs in full-scale d.d. and.the und.rlying factors.

关键词： d.inking water d.stribution system Seasonal change Microbial community Antibiotic resistance genes Mobile genetic elements

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Chinese Journal of Mechanical Engineering 2021年第1期34卷 251-265页

作者： liang sun Zhizheng Ye Fuwei lu Rongjiang Cui Chuanyu Wu Faculty of Mechanical Engineering&Automation Zhejiang Sci-Tech UniversityHangzhou 310018China

Isomorphism d.tection is fund.mental to the synthesis and.innovative d.sign of kinematic chains(KCs).The d.tection can be performed.accurately by using the similarity of ***,there are very few works on isomorphism d.tection based.on the properties of similar *** this paper,an ameliorated.multi-ord.r ad.acent vertex assignment sequence(AMAVS)method.is proposed.to seek out similar vertices and.id.ntify the isomorphism of the planar ***,the specific d.finition of AMAVS is *** the calculation of the AMAVS,the ad.acent vertex value sequence reflecting the uniqueness of the topology features is *** on the value sequence,all possible similar vertices,correspond.ng relations,and.isomorphism d.scrimination can be *** checking the topological graph of KCs with a d.fferent number of links,the effectiveness and.efficiency of the proposed.method.are ***,the method.is employed.to implement the similar vertices and.isomorphism d.tection of all the 9-link 2-d.F(d.gree of freed.m)planar KCs.

关键词： Similar vertices Isomorphism d.tection Kinematic chains Topology features AMAVS

Cd. nanoparticles d.corated.hexagonal Fe_(2)O_(3) nanosheets with a Z-scheme photogenerated.electron transfer path for improved.visible-light photocatalytic hyd.ogen prod.ction

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Chinese Journal of Chemical Engineering 2022年第3期35卷 266-274页

作者： Feng Guo Haoran sun Yuxing Shi Fengyu Zhou Weilong Shi School of Energy and.Power Jiangsu University of Science and TechnologyZhenjiang 212003China School of Material Science and.Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

Photocatalytic water splitting for hyd.ogen prod.ction(H_(2))is one of the main potential applications of photocatalytic technology,which can use solar energy as the energy required.for chemical reactions to alleviate the energy *** this work,zero-d.mensional/two-d.mensional(0d.2d.contact surface Cd./α-Fe_(2)O_(3)(CF)heterojunction photocatalyst was synthesized.via a simple solvothermal *** hyd.ogen prod.ction experiments revealed.that the CF-15 sample shows the optimal photocatalytic H_(2)rate(1806μmol·h^(-1)·g^(-1))and.apparent quantum efficiency(AQE=13.7%atλ=420 nm).The enhancement of photocatalytic performance is mainly attributed.to the contact of 0d.2d.interface and.the synergistic effect of Z-scheme electron transfer *** work provid.s an effective way for mod.fied.composite semicond.ctor photocatalyst by constructing special interface heterojunction to achieve highly efficiently catalysis.

关键词： Photocatalysis Hyd.ogen prod.ction 0d.2d Cd. α-Fe_(2)O_(3) Z-scheme

Ceramic membrane fouling mechanisms and.control for water treatment

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Frontiers of Environmental Science & Engineering 2023年第10期17卷 103-117页

作者： Cheng Cai Wenjun sun Siyuan He Yuanna Zhang Xuelin Wang School of Environmental Science&Engineering Tianjin UniversityTianjin 300072China School of Environment Tsinghua UniversityBeijing 100084China Research Institute for Environmental Innovation(Suzhou)Tsinghua Suzhou 215163China

Membrane separation, as an important d.inking water treatment technology, has wid. applications. The remarkable ad.antages of ceramic membranes, such as chemical stability, thermal stability, and.high mechanical strength, end.w them with broad.r prospects for d.velopment. d.spite the importance and.ad.antages of membrane separation in water treatment, the technique has a limitation: membrane fouling, which greatly lowers its effectiveness. This is caused.by organics, inorganic substances, and.microorganisms clogging the pore and.polluting the membrane surface. The increase in membrane pollution greatly lowers purification effectiveness. Controlling membrane fouling is critical in ensuring the efficient and.stable operation of ceramic membranes for water treatment. This review analyzes four mechanisms of ceramic membrane fouling, namely complete blocking, stand.rd.blocking, intermed.ate blocking, and.cake filtration blocking. It evaluates the mechanisms und.rlying ceramic membrane fouling and.summarizes the progress in approaches aimed.at controlling it. These includ. ceramic membrane pretreatment, ceramic membrane surface mod.fication, membrane cleaning, magnetization, ultrasonics, and.nanobubbles. This review highlights the importance of optimizing ceramic membrane preparation through further research on membrane fouling and.pre-membrane pretreatment mechanisms. In ad.ition, combining process regulations with ceramic membranes as the core is an important research d.rection for ceramic membrane-based.water treatment.

关键词： Ceramic membrane Fouling mod.l Fouling control

Surface-ind.ced.orbital-selective band.reconstruction in kagome supercond.ctor CsV_(3)Sb_(5)

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Chinese Physics B 2022年第5期31卷 10-14页

作者： linwei Huai Yang luo Samuel M.l.Teicher Brend.n R.Ortiz Kaize Wang Shuting Peng Zhiyuan Wei Jianchang Shen Bingqian Wang Yu Miao Xiupeng sun Zhipeng Ou Stephen d.Wilson Junfeng He CAS Key laboratory of Strongly-coupled.Quantum Matter Physics and.d.partment of Physics University of Science and Technology of ChinaHefei 230026China Materials d.partment and.California Nanosystems Institute University of California Santa BarbaraSanta BarbaraCalifornia 93106USA

The two-d.mensional(2 d.kagome supercond.ctor Cs V_(3)Sb_(5) has attracted.much recent attention d.e to the coexistence of supercond.ctivity,charge ord.rs,topology and.kagome physics,which manifest themselves as d.stinct electronic structures in both bulk and.surface states of the *** interesting next step is to manipulate the electronic states in this ***,we report angle-resolved.photoemission spectroscopy(ARPES)evid.nce for a surface-ind.ced.orbitalselective band.reconstruction in Cs V_(3)Sb_(5).A significant energy shift of the electron-like band.around.and.a mod.rate energy shift of the hole-like band.around.M are observed.as a function of *** evolution is reprod.ced.in a much shorter time scale by in-situ annealing of the Cs V_(3)Sb_(5) ***-resolved.d.nsity functional theory(d.T)calculations reveal that the momentum-d.pend.nt band.reconstruction is associated.with d.fferent orbitals for the band. around.and.M,and.the time-d.pend.nt evolution points to the change of sample surface that is likely caused.by the formation of Cs vacancies on the *** results ind.cate the possibility of orbital-selective control of the band.structure via surface mod.fication,which may open a new avenue for manipulating exotic phenomena in this material system,includ.ng supercond.ctivity.

关键词： photoemission kagome supercond.ctor band.structure

Ultrasensitive Mechanical Sensor Using Tunable Ord.red.Array of Metallic and.Insulating States in Vanad.um d.oxid.

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Chinese Physics letters 2024年第7期41卷 74-86页

作者：马泽成闫胜楠陈繁强戴玉頔刘增霖徐康徐涛童湛钦陈墨雨王利铮王鹏飞孙立涛程斌梁世军缪峰 Institute of Brain-Inspired.Intelligence National Laboratory of Solid State MicrostructuresSchool of PhysicsCollaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China SEU-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of EducationSoutheast UniversityNanjing 210096China Institute of Interd.sciplinary of Physical Sciences School of ScienceNanjing University of Science and TechnologyNanjing 210094China

d.tecting tiny d.formations or vibrations, particularly those associated.with strains below 1%, is essential in various technological applications. Trad.tional intrinsic materials, includ.ng metals and.semicond.ctors, face challenges in simultaneously achieving initial metallic state and.strain-ind.ced.insulating state, hind.ring the d.velopment of highly sensitive mechanical sensors. Here we report an ultrasensitive mechanical sensor based.on a strain-ind.ced.tunable ord.red.array of metallic and.insulating states in the single-crystal bronze-phase vanad.um d.oxid. [VO_(2)(B)] quantum material. It is shown that the initial metallic state in the VO_(2)(B) flake can be tuned.to the insulating state by applying a weak uniaxial tensile strain. Such a unique property gives rise to a record.high gauge factor of above 607970, surpassing previous values by an ord.r of magnitud., with excellent linearity and.mechanical resilience as well as d.rability. As a proof-of-concept application, we use our proposed.mechanical sensor to d.monstrate precise sensing of the micro piece, gentle airflows and.water d.oplets. We attribute the superior performance of the sensor to the strain-ind.ced.continuous metal-insulator transition in the single-crystal VO_(2)(B) flake, evid.nced.by experimental and.simulation results. Our find.ngs highlight the potential of exploiting correlated.quantum materials for next-generation ultrasensitive flexible mechanical sensors, ad.ressing critical limitations in trad.tional materials.

关键词： metallic d.rability hind.r

Accurate closed.form eigensolutions of three-d.mensional panel flutter with arbitrary homogeneous bound.ry cond.tions

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Chinese Journal of Aeronautics 2023年第1期36卷 266-289页

作者： Qiaozhen sun Yufeng XING Bo lIU Bocheng ZHANG Zekun WANG COMAC Beijing Aircraft Technology Research Institute Beijing 102211China Institute of Solid.Mechanics Beihang UniversityBeijing 100191China

Highly accurate closed.form eigensolutions for flutter of three-d.mensional(3d.panel with arbitrary combinations of simply supported.S),glid.(G),clamped.C)and.free(F)bound.ry cond.tions(BCs),such as cantilever panels,are achieved.accord.ng to the linear thin plate theory and.the first-ord.r piston theory as well as the complex mod.l analysis,and.all solutions are in a simple and.explicit *** iterative Separation-of-Variable(iSOV)method.proposed.by the pre-sent authors is employed.to obtain the highly accurate *** flutter mechanism is stud.ed.with the benefit of eigenvalue properties from mathematical *** effects of bound.ry cond.tions,chord.thickness ratios,aerod.namic d.mping,aspect ratios and.in-plane load. on flut-ter properties are *** results are compared.with those of Kantorovich method.and.Galerkin method.and.also coincid. well with analytical solutions in literature,verifying the accu-racy of the present closed.form *** is revealed.that,(A)the flutter characteristics are d.mi-nated.by the cross section properties of panels in the d.rection of stream flow;(B)two types of flutter,called.coupled.mod. flutter and.zero-frequency flutter which includ.s zero-frequency single-mod. flutter and.buckling,are observed.(C)bound.ry cond.tions and.in-plane load. can affect both flutter bound.ry and.flutter type;(d.the flutter behavior of 3d.panel is similar to that of the two-d.mensional(2d.panel if the aspect ratio is up to a certain value;(E)four to six mod.s should.be used.in the Galerkin method.for accurate eigensolutions,and.the results converge to that of Kantorovich method.which uses the same mod. functions in the d.rection perpend.cular to the stream *** present analysis method.can be used.as a reference for other stability issues characterized.by complex eigenvalues,and.the highly closed.form solutions are useful in parameter d.signs and.can also be taken as benchmarks for the valid.tion of numerical method..

关键词： Analytical Closed.form Eigenvalues Flutter Three-d.mensional

Revealing phase transitions and.instabilities in pseud.spark d.scharges

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High Voltage 2023年第4期8卷 819-832页

作者： Jiaqi Yan Saikang Shen Guoxiang sun Weid.ng d.ng Weizong Wang School of Astronautics Beihang UniversityBeijingChina State Key laboratory of Electrical Insulation and.Power Equipment Xi'an Jiaotong UniversityXi'anChina

Pseud.spark d.scharge is a low-pressure high-voltage pulsed.d.scharge with hollow electrod.s,and.the overall d.scharge experiences several d.stinctive *** instability phenomena,characterised.by the sud.en oscillations or d.stortions of d.scharge voltage and.current,restrict the applications of pseud.spark *** stud. presents an investigation into phase transitions and.instabilities in pseud.spark d.scharge by combining the evid.nces from multiple d.scharge waveforms,time-resolved.images,electron beam current profiles,2d.kinetic simulation results,and.the spectral line emission of cathod. *** process of a normal pseud.spark d.scharge is firstly d.scussed.and.the threshold.cond.tions of the transition from the superd.nse glow d.scharge(SGd.phase to the high current phase with arc cathod. spots are *** to temporal profiles and.voltage-current characteristics,two types and.four occurrences of instabilities are d.stinguished.type Ⅰ—in the pre-breakd.wn phase;type Ⅱ-1—in the SGd.phase;type Ⅱ-2—in the transition of cathod. spots propagating from cathod. hole ed.e to cathod. plane;type Ⅱ-3—in the re-initiation of spots near current *** is found.that the instability of type Ⅰ is caused.by the stepwise penetration of virtual anod. plasma,and.type Ⅱ is closely related.to the cyclic nature and.finite lifetime of cathod. *** is ind.ced.by the fact that the d.cay of cathod. spots is faster than the formation und.r certain cond.tions,and.the existing spots are not able to provid. the current required.by the external *** features and.the suppression method. of the instabilities are d.scussed.based.on the proposed.mechanisms.

关键词： phase cathod. lifetime

A review of the synthesis and.application of zeolites from coal-based.solid.wastes

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International Journal of Minerals,Metallurgy and.Materials 2022年第1期29卷 1-21页

作者： Xiaoyu Zhang Chunquan li Shuilin Zheng Yonghao d. Zhiming sun School of Chemical and.Environmental Engineering China University of Mining and Technology(Beijing)Beijing 100083China

Zeolite d.rived.from coal-based.solid.wastes(coal gangue and.coal fly ash)can overcome the environmental problems caused.by coal-based.solid.wastes and.achieve valuable *** this paper,the physicochemical properties of coal gangue and.coal fly ash are *** mechanism and.application characteristics of the pretreatment processes for zeolite synthesis from coal-based.solid.wastes are also *** synthesis processes of coal-based.solid.waste zeolite and.their ad.antages and.d.sad.antages are ***,the application characteristics of various coal-based.solid.waste zeolites and.their common application field. are ***,we propose an alkaline fusion-assisted.supercritical hyd.othermal crystallization as an efficient method.for synthesizing coal-based.solid.waste *** ad.ition,more attention should.be given to the recycling of alkaline waste liquid.and.the application of coal-based.solid.waste zeolites in the field.of volatile organic compound.ad.orption removal.

关键词： coal-based.solid.waste coal fly ash coal gangue zeolite