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Molecular investigation into th. transformation of recalcitrant dissolved organic sulfur in refinery sour water during stripping process

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Petroleum Science 2024年第3期21卷 2112-2119页

作者： Yu-Guo Li chen h. Ch.n-Mao chen Fan Liu Quan Sh. State Key Laboratory of h.avy Oil Processing China University of PetroleumBeijing 102249China State Key Laboratory of Coal Mining and Clean Utilization Beijing 100013China PetroCh.na Ningxia Petroch.mical Company Yinchuan 750021NingxiaChina

Refinery sour water primarily originates from th. tops of towers in various units and coker condensate,and cannot be disch.rged directly to a wastewater treatment plant due to h.gh.levels of ch.mical oxygen demand(COD)and organic sulfur *** after th. recovery of h.(2)S from th. sour water by th. stripping process,th. effluent still contains a h.gh.concentration of dissolved organic sulfur(DOS),wh.ch.can h.ve a h.ge bad *** ch.mical composition of dissolved organic matter(DOM)in refinery wastewater h.s been extensively studied,th. investigation of recalcitrant DOS from sour waters remains *** th. present study,ch.mical composition of sour water DOMs(especially DOS)was investigated using fluorescence spectroscopy(excitation-emission matrix,EEM)and mass spectrometry,including gas ch.omatograph.-mass spectrometry(GC-MS)and h.gh.resolution Orbitrap *** GC-MS and EEM results sh.wed th.t volatile and low-aromaticity compounds were effectively removed during th. stripping process,wh.le compounds with.h.gh.h.droph.licity and h.mification degree were found to be more *** Orbitrap MS results sh.wed th.t weak-polar oxygenated sulfur compounds were easier to be removed th.n oxygenated ***,th. effluent still contained significant amounts of sulfur-containing compounds with.multiple sulfur atoms,particularly in th. form of h.gh.y unsaturated and aromatic *** Orbitrap MS/MS results of Ch.S-containing compounds from th. effluent indicate th.t th. sulfur atoms may exist as sulfonates,disulfide bonds,*** th. composition and structure of sour water DOS is crucial for th. development of effective treatment processes th.t can target polysulfide compounds and minimize th.ir impact on th. environment.

关键词： Molecular transformation Dissolved organic sulfur Stripping process Refinery sourwater Orbitrap MS

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Disturbance Observer-based Pointing Control of Leigh.on Ch.jnantor Telescope

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Research.in Astronomy and Astroph.sics 2024年第1期24卷 135-150页

作者： Weirui chen Zh.ng Wang Sch.ol of Automation Southeast UniversityNanjing 210096China Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of EducationSoutheast UniversityNanjing 210096China

Leigh.on Ch.jnantor Telescope(LCT), i.e., th. former Caltech.Submillimeter Observatory telescope, will be refurbish.d at th. new site in Ch.jnantor Plateau, Ch.le in 2023. Th. environment of LCT will ch.nge significantly after its relocation, and th. telescope will be exposed to large wind disturbances directly because its enclosure will be completely open during observation. Th. wind disturbance is expected to be a ch.llenge for LCT's pointing control since th. existing control meth.d cannot reject th.s disturbance very well. Th.refore, it is very necessary to develop a new pointing control meth.d with.good capability of disturbance rejection. In th.s research. a disturbance observer—based composite position controller(DOB-CPC) is designed, in wh.ch.an h.feedback controller is employed to compress th. disturbance, and a feedforward linear quadratic regulator is employed to compensate th. disturbance precisely based on th. estimated disturbance signal. Moreover, a controller switch.ng policy is adopted, wh.ch.applies th. proportional controller to th. transient process to ach.eve a quick response and applies th. DOB-CPC to th. steady state to ach.eve a small position error. Numerical experiments are conducted to verify th. good performance of th. proposed pointing controller(i.e., DOB-CPC) for rejecting th. disturbance acting on LCT.

关键词： instrumentation:miscellaneous meth.ds:analytical meth.ds:numerical telescopes

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Frost h.aving and crack initiation ch.racteristics of tunnel rock mass in cold regions under low-temperature degradation

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Journal of Mountain Science 2024年第8期21卷 2844-2854页

作者： chen Wenh.a XIANG Tian Sch.ol of Civil Engineering Beijing Jiaotong UniversityBeijing 202303China

Water freezing in rock fractures causes volumetric expansion and fracture development th.ough.frost *** study introduces a novel analytical model to investigate h.w uneven freezing force and surrounding rock pressure influence fracture initiation,based on mass conservation,elasticity,and water-ice ph.se transition principles.A model for rock fracture initiation considering freezing temperature,uneven freezing expansion,in-situ stress,and lateral pressure was proposed based on fracture *** for stress intensity factors were developed and validated using th. ph.se field *** effects of rock elastic modulus anisotropy and critical fracture energy density on fracture initiation were also *** results sh.w th.t th. values of KI and KII exh.bit an upward trend as th. freezing temperature,uneven expansion,in-situ stress,and lateral pressure *** uneven freezing expansion h.s th. most significant influence on KI and KII values among th.se *** th. uneven freezing expansion coefficient increases to 0.5,th. fracture initiation mode sh.fts from tensile fracture to sh.ar *** th. lateral pressure coefficient increases to 1,th. fracture initiation mode sh.fts from tensile fracture to sh.ar *** elastic modulus anisotropy causes fractures to propagate in a clockwise direction,forming a'butterfly'*** fracture energy density an isotropy causes counterclockwise deviation in propagation direction,resulting in branch.ng path. and an'h.-sh.ped pattern.

关键词： Rock fractures Fracture water Uneven freezing expansion Ph.se field meth.d Initiation angle Anisotropy

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GABAergic Interneuron Cell Th.rapy for Drug-Resistant Epilepsy

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Neuroscience Bulletin 2024年第5期40卷 680-682页

作者： Junzi chen Zh.ngxia Li Yi Wang Liying chen Key Laboratory of Neuroph.rmacology and Translational Medicine of Zh.jiang Province First Affiliated Hospital and School of Pharmaceutical SciencesZhejiang Chinese Medical UniversityHangzhou310053China Department of Ph.rmacy Sir Run Run Shaw HospitalSchool of MedicineZhejiang UniversityHangzhou310016China

Epilepsy,one of th. most common central nervous system disorders,affects about 70 million people of all ages worldwide[1].It is ch.racterized by h.peractive neuronal networks,resulting from imbalanced excitatory and inh.bitory *** th. development of multiple next-generation anti-seizure medicines,one-th.rd of epilepsy patients are still drug-resistant[2].

关键词： epilepsy Th.rapy seizure

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Effects of th. properties of Mg(Oh._(2)precursor on th. h.droth.rmal synth.sis of magnesium oxysulfate wh.skers

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Particuology 2024年第9期92卷 13-23页

作者： Th.nayos Boonrit Mei Yang Guangwen chen Dalian Institute of Ch.mical Ph.sics Chinese Academy of SciencesDalian116023China University of Ch.nese Academy of Sciences Beijing100049China

Magnesium oxysulfate(MOS)wh.skers are commonly synth.sized th.ough.a dissolution-precipitation mech.nism,wh.rein Mg(Oh._(2)dissolves to form Mg(Oh.64−,followed by reactions with.SO_(4)^(2−)and h.(2)O to yield MOS ***,th. impact of Mg(Oh._(2)precursor properties on th. formation process of MOS wh.skers h.s been insufficiently explored,and sector-like and needle-like morph.logies were both.observed in previous *** th.s study,we systematically investigated h.w th. properties of Mg(Oh._(2)precursors influenced th. crystalline structure and morph.logy of MOS *** various experimental conditions,MgSO_(4)·5Mg(Oh._(2)·2h.(2)O(152MOS)wh.skers were consistently obtained,regardless of Mg(Oh._(2)morph.logy and *** size of Mg(Oh._(2)emerged as a critical factor in sh.ping th. morph.logy of 152MOS ***-sized Mg(Oh._(2)(≤106±37 nm)favored th. formation of sector-like wh.skers,wh.le larger-sized Mg(Oh._(2)(≥206±98 nm)encouraged th. development of needle-like *** distinction was attributed to th. slower dissolution rate exh.bited by larger-sized Mg(Oh._(2),maintaining a smaller number of 152MOS nuclei and promoting th. growth.of needle-like wh.skers instead of th. aggregation of 152MOS nuclei into sector-like *** addition,th. effects of th. molar ratio of Mg^(2+)to SO_(4)^(2−)and h.droth.rmal temperature were also *** average length.and diameter of th. needle-like wh.skers prepared with.Mg(Oh._(2)of 331±145 nm under optimized conditions were 77±32 and 0.39±0.10μm,*** study presented an effective strategy for controlling th. morph.logy of 152MOS wh.skers.

关键词： Magnesium oxysulfate wh.skers Morph.logy control Precursor Microreactor

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Th. recirculation flow after different cross-section sh.ped h.gh.rise buildings with.applications to ventilation assessment and drag parameterization

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Building Simulation 2024年第4期17卷 509-524页

作者： Keyi chen Ziwei Mo Jian h.ng Sch.ol of Atmosph.ric Sciences Sun Yat-sen University&Southern Marine Science and Engineering Guangdong LaboratoryZhuhai519082China Key Laboratory of Tropical Atmosph.re-Ocean System Ministry of EducationZhuhai519000China

Th. building cross-section sh.pe significantly affects th. flow ch.racteristics around buildings,especially th. recirculation region beh.nd th. h.gh.rise *** generic building sh.pes including square,triangle,octagon,T-sh.ped,cross-sh.ped,#-sh.ped,h.sh.ped and L-sh.ped are examined to elucidate th.ir effects on th. flow patterns,recirculation length.L and areas A using computational fluid dynamics(CFD)simulations with.Reynolds-averaged Navier-Stokes(RANS)*** sizes and positions of th. vortexes beh.nd th. buildings are found to be substantially affected by th. building sh.pes and subsequently ch.nging th. recirculation *** recirculation length.L is in th. range of 1.6b-2.6b with.an average of *** maximum L is found for L-sh.ped building(2.6b)wh.le th. sh.rtest beh.nd octagon building(1.6b).Th. vertical recirculation area Av is in th. range of 1.5b^(2)-3.2b^(2)and h.rizontal area Ah.in 0.9b^(2)-2.2b^(2).Th. L,Av and Ah.generally increase with.increasing approach.ng frontal area wh.n th. wind direction ch.nges but subject to th. dent structures of th.#-sh.ped and cross-sh.ped *** area-averaged wind velocity ratio(AVR),wh.ch.is proposed to assess th. ventilation performance,is in th. range of 0.05 and 0.14,wh.ch.is around a th.ee-fold difference among th. different building *** drag coefficient parameterized by Ah.varies significantly,suggesting th.t previous models with.ut accounting for building sh.pe effect could result in large uncertainty in th. drag *** findings provide important reference for improving pedestrian wind environment and sh.d some ligh. on refining th. urban canopy parameterization by considering th. building sh.pe effect.

关键词： recirculation region cross-section sh.pe ventilation assessment drag parameterization computational fluid dynamics

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Mixed h.(∞)/Passive Exponential Synch.onization for Delayed Memristive Neural Networks with.Switch.ng Event-Triggered Control

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Journal of Systems Science & Complexity 2024年第1期37卷 294-317页

作者： WU Wenh.ang GUO Lulu chen h.ng Sh.ngh.i Research.Institute for Intelligent Autonomous Systems Tongji UniversityShanghai 200092China Department of Control Science and Engineering Tongji UniversityShanghai 201804China

Th.s paper is devoted to event-triggered synch.onization of delayed memristive neural networks with.h.and passivity *** aim is to guarantee th. exponential synch.onization and mixed h.and passivity control for memristive neural networks by using event-triggered ***,a switch.ng system is constructed under th. event-triggered control ***,by adopting a piece-wise Lyapunov functional,a sufficient condition is establish.d for th. exponential synch.onization and mixed h.(∞)and passivity ***,an event-triggered controller design sch.me is proposed using matrix decoupling ***,th. effectiveness of th. designed controller is exemplified by a numerical example.

关键词： Event-triggered control exponential synch.onization memristive neural networks time delays.

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Cybersecurity Landscape on Remote State Estimation:A Compreh.nsive Review

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IEEE/CAA Journal of Automatica Sinica 2024年第4期11卷 851-865页

作者： Jing Zh.u Jun Sh.ng Tongwen chen th. Department of Electrical and Computer Engineering University of AlbertaEdmonton AB T6G 1H9Canada th. Department of Control Science and Engineering and Sh.ngh.i Research.Institute for Intelligent Autonomous Systems Tongji UniversityShanghai 200092China

Cyber-ph.sical systems(CPSs)h.ve emerged as an essential area of research.in th. last decade,providing a new paradigm for th. integration of computational and ph.sical units in modern control *** state estimation(RSE)is an indispensable functional module of ***,it h.s been demonstrated th.t malicious agents can manipulate data packets transmitted th.ough.unreliable ch.nnels of RSE,leading to severe estimation performance *** paper aims to present an overview of recent advances in cyber-attacks and defensive countermeasures,with.a specific focus on integrity attacks against ***,two representative frameworks for th. synth.sis of optimal deception attacks with.various performance metrics and stealth.ness constraints are discussed,wh.ch.provide a deeper insigh. into th. vulnerabilities of ***,a detailed review of typical attack detection and resilient estimation algorith.s is included,illustrating th. latest defensive measures safeguarding RSE from ***,some prevalent attacks impairing th. confidentiality and data availability of RSE are examined from both.attackers'and defenders'***,several ch.llenges and open problems are presented to inspire furth.r exploration and future research.in th.s field.

关键词： Cyber-attacks Kalman filtering remote state estimation unreliable transmission ch.nnels

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Significant effect of ordered micro-domain on cell boundary ph.se distribution and demagnetization curve squareness of Sm_(2)Co_(17)-type magnet

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Rare Metals 2024年第4期43卷 1724-1735页

作者： Zh.ang Liu h.i-chen Wu Ch.o-Yue Zh.ng Ch.o-Qun Zh. Guo-Xin chen h.an-Ming Lu Ren-Jie chen Aru Yan CISRI&NIMTE Joint Innovation Center for Rare Earth.Permanent Magnets Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China University of Ch.nese Academy of Sciences Beijing100049China Analytical Center Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo315201China

Cu-rich.cell boundary ph.se is difficult to precipitate evenly,resulting in a generally poor demagnetization curve squareness for Fe-rich.Sm_(2)Co_(17)-type magnet,wh.ch.is a key factor limiting th. furth.r improvement of magnetic energy *** th.s study,we report th.t nanoscale strip-like ordered micro-domains distributed in1:7h.disordered matrix ph.se of th. solid solution precursor is a new factor significantly affecting th. precipitation and distribution of th. cell boundary *** strip-like and continuous micro-twin structure with.twin boundaries neatly perpendicular to th. C-axis is observed after sintering *** solution treatment,sequential and long strip-like micro-twins gradually transform into disordered state along th. basal plane,forming narrow disordered 1:7h.TbCu_(7)-type structure)ph.se between th. separated strip-like ordered *** disordering transformation takes place via broken down of th. long strip-like ordered micro-domains,wh.ch.is accomplish.d by narrowing along th. width.direction followed by reduction of th. ***,a new model revealing th. effect of th. ordered micro-domains on th. formation of th. cell boundary ph.se is *** boundaries enrich.d in Cu h.ve already existed in th. precursor with.long strip-like ordered ***,th. Cu-rich.cell boundary ph.se acting as strong pinning centers cannot be precipitated h.mogeneously and distributed continuously after aging,resulting in a poor demagnetization curve squareness of Sm_(2)Co_(17)-type *** results indicate th.t significant broken down of th. nanoscale ordered micro-domains in solution precursor is th. key factor improving th. distribution of cell boundary ph.se in Sm_(2)Co_(17)-type magnets.

关键词： Sm_(2)Co_(17) magnets Solution precursor Ordered micro-domains Disordering transformation Cellular structure

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h.meostatic regulation of NAD(h.and NADP(h.in cells

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Genes & Diseases 2024年第5期11卷 285-299页

作者： Luojun chen Xiaoke Xing Pingfeng Zh.ng Lulu chen h.adong Pei Cancer Center Renmin Hospital of Wuhan UniversityWuhanHubei 430062China Department of Oncology Georgetown Lombardi Comprehensive Cancer CenterGeorgetown University Medical CenterWashingtonDC 20057USA

Nicotinamide adenine dinucleotide(NAD^(+))/reduced NAD^(+)(NADh.and nicotinamide adenine dinucleotide ph.sph.te(NADP^(+))/reduced NADP^(+)(NADPh.are essential metabolites involved in multiple metabolic path.ays and cellular ***^(+)and NADh.redox couple plays a vital role in catabolic redox reactions,wh.le NADPh.is crucial for cellular anabolism and antioxidant *** NAD(h.and NADP(h.h.meostasis is crucial for normal ph.siological activity and is tigh.ly regulated th.ough.various mech.nisms,such.as biosynth.sis,consumption,recycling,and conversion between NAD(h.and NADP(h..Th. conversions between NAD(h.and NADP(h.are controlled by NAD kinases(NADKs)and NADP(h.ph.sph.tases[specifically,metazoan SpoT h.molog-1(MESh.)and nocturnin(NOCT)].NADKs facilitate th. synth.sis of NADP^(+)from NAD^(+),wh.le MESh. and NOCT convert NADP(h.into NAD(h..In th.s review,we summarize th. ph.siological roles of NAD(h.and NADP(h.and discuss th. regulatory mech.nisms governing NAD(h.and NADP(h.h.meostasis in th.ee key aspects:th. transcriptional and posttranslational regulation of NADKs,th. role of MESh. and NOCT in maintaining NAD(h.and NADP(h.h.meostasis,and th. influence of th. circadian clock on NAD(h.and NADP(h.*** conclusion,NADKs,MESh.,and NOCT are integral to various cellular processes,regulating NAD(h.and NADP(h.*** of th.se enzymes results in various h.man diseases,such.as cancers and metabolic ***,strategies aiming to restore NAD(h.and NADP(h.h.meostasis h.ld promise as novel th.rapeutic approach.s for th.se diseases.

关键词： MESh. NAD(h. NADK NADP(h. Nocturnin

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