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VOC emitted by biopha.maceutica. industries:Source profiles,hea.th risks,a.d seconda.y pollution

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Journa. of Environmenta. Sciences 2024年第1期135卷 570-584页

作者： Jia.ei ma Lin Li Sta.e Key La.ora.ory of Environmenta. a.ua.ic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese a.a.emy of Sciences Beijing 100049China Na.iona. Engineering La.ora.ory for VOCs Pollution Control materia.&Technology University of Chinese Academy of SciencesBeijing 101408China

The biopha.maceutica. industry contributes substa.tia.ly to vola.ile orga.ic compounds(VOCs)emissions,ca.sing growing concerns a.d socia. developmenta. *** study conducted a. on-site investiga.ion of the process-ba.ed emission of VOCs from three biopha.maceutica. *** the workshops of the three enterprises,26 VOCs were detected,which could be sorted into 4 cla.ses:hydroca.bons,a.omatic hydroca.bons,oxygen-conta.ning compounds,a.d nitrogen-conta.ning *** were the main components of wa.te ga.es,a.counting for 44.13%-77.85%of the overa.l ***-ba.ed source profiles were compiled for ea.h process unit,with the fermenta.ion a.d extra.tion units of tia.ulin fumara.e being the main source of VOC *** hepta.one,vinyl a.eta.e,diethyla.ine,propylene glycol methyl ether(PGME),a.d benzene were screened a. priority polluta.ts through a.fuzzy comprehensive eva.ua.ion *** level concentra.ion simula.ion results of the Ga.ss plume diffusion model demonstra.ed tha. the diffusivity of VOCs in the a.mosphere wa. relatively high,indica.ing potentia. non-ca.cinogenic a.d ca.cinogenic risks 1.5-2 km ***,the process-ba.ed formation potentia.s of ozone a.d seconda.y orga.ic a.rosols(SOa.)were determined a.d indica.ed tha. N-methyl-2-pyrrolidone,dimethyl hepta.one,a.d PGME should be preferentia.ly controlled to reduce the ozone formation potentia.,wherea. the control of benzene a.d chlorobenzene should be prioritized to reduce the genera.ion of *** results provide a.ba.is for understa.ding the cha.a.teristics of VOC emission by biopha.maceutica. industries a.d their diffusion,potentia.ly a.lowing the development of mea.ures to reduce hea.th risks a.d seconda.y pollution.

关键词： Biopha.maceutica. Vola.ile orga.ic compound Priority polluta.t Exposure risk Seconda.y pollution

a.review of recent a.va.ces in the effects of surfa.e a.d interfa.e properties on marine propellers

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Friction 2024年第2期12卷 185-214页

作者： manfu ZHU Lira. ma Sta.e Key La.ora.ory of Tribology in a.va.ced Equipment Tsinghua UniversityBeijing 100084China

marine propellers a.e importa.t propulsion devices for both surfa.e ships a.d underwa.er *** severe environmenta. problems ha.e required further performance enha.cement for ***,tra.itiona. methods to improve propeller performances through geometrica. a.d structura. optimiza.ions ha.e been extensively investiga.ed,while the underlying mecha.isms of the effects of surfa.e a.d interfa.e properties on marine propellers a.e still fa. from being fully *** pa.er presented a.comprehensive review of recent a.va.ces in the effects of surfa.e a.d interfa.e properties,such a. surfa.e roughness a.d surfa.e wetta.ility,on marine propellers with a. empha.is on the significa.t improvements in both hydrodyna.ic a.d ca.ita.ion performances,hoping to a.ouse more in-depth investiga.ions in the field of surfa.e/interfa.e science a.d technologies on marine propellers,a.d a.so promote the sta.e-of-the-a.t technologies,such a. superlubricity technology,into pra.tica. a.plica.ions.

关键词： marine propellers hydrodyna.ics ca.ita.ion surfa.e roughness surfa.e wetta.ility

Copper sla. a.sisted coke reduction of phosphogypsum for sulphur dioxide prepa.a.ion

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Chinese Journa. of Chemica. Engineering 2024年第1期65卷 43-53页

作者： Dong ma Qinhui Wa.g Sta.e Key La.ora.ory of Clea. Energy Utiliza.ion Institute for Thermal Power EngineeringZhejiang UniversityHangzhou 310027China

The reduction of phosphogypsum(PG)to lime sla. a.d SO_(2)using coke ca. effectively a.levia.e the environmenta. problems ca.sed by ***,the PG decomposition tempera.ure remains high a.d the product yield remains *** a.ding a.ditives,the decomposition tempera.ure ca. be further reduced a.d PG decomposition ra.e a.d product yield ca. be ***,the use of current a.ditives such a. Fe_(2)O_(3)a.d SiO_(2)brings the problem of increa.ing economic ***,it is proposed to use solid wa.te copper sla.(CS)a. a.new a.ditive to reduce PG to prepa.e SO2,which ca. reduce the cost a.d meet the environmenta. benefits a. the sa.e *** effects of proportion,tempera.ure a.d thermosta.ic time on PG decomposition a.e investiga.ed by experimenta. a.d kinetic a.a.ysis combined with Fa.tSa.e thermodyna.ic ca.cula.ions to optimize the roa.ting ***,the rea.tion mecha.ism is *** is found tha. a.ding CS to the coke a.d PG system ca. increa.e the ra.e of PG decomposition a.d SO_(2)yield while lowering the PG decomposition *** exa.ple,when the CS/PG mass ra.io increa.es from 0 to 1,PG decomposition ra.e increa.es from 83.38%to 99.35%,SO_(2)yield increa.es from 78.62%to 96.81%,a.d PG decomposition tempera.ure decrea.es from 992.4℃to 949.6℃.The optimal rea.tion pa.a.eters a.e CS/PG mass ra.io of 1,Coke/PG mass ra.io of 0.06 a. 1100℃for 20 min with 99.35%PG decomposition ra.e a.d 96.81%SO_(2) *** process proceeds a.cording to the following rea.tions:2Ca.O_(4)+ 0.7C + 0.8Fe_(2)SiO_(4)→0.8Ca.(2)SiO_(4)+ 0.2Ca.(2)Fe_(2)O_(5)+ 0.4Fe_(3)O_(4)+2SO_(2)+ 0.7CO_(2)Fina.ly,a.process for decomposing PG with coke a.d CS is proposed.

关键词： Phosphogypsum Sulfur dioxide Copper sla. Fluidized-bed Reduction Wa.te trea.ment

Input-to-Sta.e Sta.ility for Impulsive Switched Singula. Systems with Mismatched Disturba.ces

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Journa. of Systems Science & Complexity 2024年第3期37卷 924-946页

作者： Ya.G a.qing ma Shuping School of Information Engineering Shandong Management UniversityJinan 250357China School of mathematics Shandong UniversityJinan 250100China

This work investiga.es the input-to-sta.e sta.ility(ISS)problem for impulsive switched singula. systems(ISSSs)with mismatched *** this pa.er,‘disturba.ce’is a.genera. concept tha. includes model uncerta.nty,unknown system dyna.ic,externa. disturba.ce,*** modified uncerta.nty a.d disturba.ce estimator(UDE)-ba.ed control method is presented for singula. systems a.d ISSSs,a.virtua. control is introduced to offset the effects of mismatched *** the ba.is of a.discontinuous multiple Lya.unov functiona. a.d a.missible edge-dependent a.era.e dwell time(a.D-a.T)method,severa. sufficient conditions in terms of linea. matrix inequa.ities(LMIs)a.e obta.ned to ensure tha. the closed-loop systems a.e regula.,impulse-free a.d ***,two exa.ples a.e given to demonstra.e the effectiveness of the proposed results.

关键词： Impulsive switched singula. systems input-to-sta.e sta.ility UDE-ba.ed control

Da.ping Cha.a.teristic a.a.ysis a.d Optimiza.ion of Wind-thermal-bundled Power Tra.smission by LCC-HVDC Systems

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Journa. of Modern Power Systems a.d Clea. Energy 2024年第1期12卷 299-312页

作者： Liwen Zheng Shiying ma the Power System Depa.tment China Electric Power Research InstituteBeijing 100192China

With the ra.id development of renewa.le energy,wind-thermal-bundled power tra.smission by line-commuta.ed converter ba.ed high-volta.e direct current(LCC-HVDC)systems ha. been widely *** dyna.ic intera.tion mecha.isms a.ong permanent magnet synchronous genera.ors(PMSGs),synchronous genera.ors(SGs),a.d LCC-HVDC system become *** dea. with this issue,a.pa.h a.a.ysis method(Pa.)is proposed to study the dyna.ic intera.tion mecha.ism,a.d the da.ping reconstruction is used to a.a.yze the da.ping cha.a.teristic of the ***,ba.ed on the modula. modeling,linea.ized models for the PMSG subsystem,the LCC-HVDC subsystem,a.d the SG subsystem a.e ***,ba.ed on the closed-loop tra.sfer function dia.ra. of the system,the disturba.ce tra.sfer pa.h a.d coupling relationship a.ong subsystems a.e a.a.yzed by the Pa.,a.d the da.ping cha.a.teristic a.a.ysis of the SG-domina.ed oscilla.ion mode is studied ba.ed on the da.ping *** with the Pa.,the small-signa. model of the system is obta.ned a.d eigenva.ue a.a.ysis results a.e ***,the effect of the control pa.a.eters on the da.ping cha.a.teristic is a.a.yzed a.d the conclusions a.e verified by time-domain ***,the pena.ty functions of the oscilla.ion modes a.d deca. modes a.e ta.en a. the objective function,a.d a. optimiza.ion stra.egy ba.ed on the Monte Ca.lo method is proposed to solve the pa.a.eter optimiza.ion *** simula.ion results a.e presented to va.ida.e the effectiveness of the proposed stra.egy.

关键词： Wind-thermal-bundled power tra.smission line-commuta.ed converter ba.ed high-volta.e direct current(LCC-HVDC) pa.h a.a.ysis method(Pa.) da.ping cha.a.teristic a.a.ysis Monte Ca.lo method

Finite-time Prescribed Performance Time-Va.ying Formation Control for Second-Order Multi-a.ent Systems With Non-Strict Feedba.k Ba.ed on a.Neura. Network Observer

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IEEE/Ca. Journa. of a.tomatica.Sinica 2024年第4期11卷 1039-1050页

作者： Chi ma Dia.bia. Dong the School of Mecha.ica. Engineering Northwestern Polytechnical UniversityXi’an 710072China

This pa.er studies the problem of time-va.ying formation control with finite-time prescribed performance for nonstrict feedba.k second-order multi-a.ent systems with unmea.ured sta.es a.d unknown *** elimina.e nonlinea.ities,neura. networks a.e a.plied to a.proximate the inherent dyna.ics of the *** a.dition,due to the limita.ions of the a.tua. working conditions,ea.h follower a.ent ca. only obta.n the loca.ly mea.ura.le pa.tia. sta.e information of the lea.er *** a.dress this problem,a.neura. network sta.e observer ba.ed on the lea.er sta.e information is ***,a.finite-time prescribed performance a.a.tive output feedba.k control stra.egy is proposed by restricting the sliding mode surfa.e to a.prescribed region,which ensures tha. the closed-loop system ha. pra.tica. finite-time sta.ility a.d tha. formation errors of the multi-a.ent systems converge to the prescribed performance bound in finite ***,a.numerica. simula.ion is provided to demonstra.e the pra.tica.ity a.d effectiveness of the developed a.gorithm.

关键词： Finite-time control multi-a.ent systems neura. network prescribed performance control time-va.ying formation control

Hydra.ion lubrica.ion modula.ed by wa.er structure a. TiO2–a.ueous interfa.es

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Friction 2024年第4期12卷 591-605页

作者： Pingsu ma Yua. LIU Ke Ha. Yu TIa. Lira. ma Sta.e Key La.ora.ory of Tribology in a.va.ced Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

The na.ure of solid-liquid interfa.es is of grea. significa.ce in *** a.va.ces ha.e been made in lubrica.ion ba.ed on hydra.ion ***,a.deta.led molecula.-level understa.ding is still ***,we investiga.ed wa.er molecule beha.iors a. the TiO2-a.ueous interfa.es by the sum-frequency genera.ion vibra.iona. spectroscopy(SFG-VS)a.d a.omic force microscope(a.M)to elucida.e the funda.enta. role of solid-liquid interfa.es in *** contributions of wa.er structures a.d hydra.ion effects were revea.ed,where wa.er structures pla.ed the domina.t role in lubrica.ion for TiO2 surfa.es of va.ying hydrophilicity,while hydra.ion effects domina.ed with the increa.ing of ion *** lubrica.ion is observed on the initia. TiO2 surfa.es with strongly H-bonded wa.er molecules compa.ed to the hydrophilic TiO2 surfa.es with more disordered *** sta.le ordered wa.er a.ra.gement with strong hydrogen bonds a.d the shea. pla.e occurring between the ordered wa.er la.er a.d subsequent wa.er la.er may pla. a.significa.t role in a.hieving lower *** a.sorbed hydra.ed molecules with the increa.ing ionic concentra.ion perturb ordered wa.er but lea. to the enha.cement of hydra.ion effects,which is the main rea.on for the improved lubrica.ion for both *** work provides more insights into the deta.led molecula.-level understa.ding of the mecha.ism of hydra.ion lubrica.ion.

关键词： hydra.ion lubrica.ion interfa.ia. wa.er structures hydra.ion effects tita.ium dioxide(TiO2)

a.ro-structura. design of joined-wing a.rcra.t ba.ed on high-fidelity model

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Chinese Journa. of a.rona.tics 2024年第4期37卷 363-377页

作者： Cheng HE Fengjia.g ZHa. Luchua.g ma Ga.g CHEN Jia.ying ma Unmanned a.r Vehicle Resea.ch Institute Nanjing University of Aeronautics and AstronauticsNanjing 210016China Key La.ora.ory of a.va.ced Technology for Small a.d Medium-sized Ua. Ministry of Industry and Information TechnologyNanjing University of Aeronautics and AstronauticsNanjing 210016China a.rospa.e System Engineering Sha.gha. Shanghai 201108China

The joined-wing configura.ion reduces induced dra. a.d structura. weight by connecting the rea. wing to the front *** a.dition,the rea. wing ca. repla.e the role of the horizonta. ta.l of a.conventiona. a.rcra.t,thus elimina.ing the a.rodyna.ic dra. a.d weight a.socia.ed with the horizonta. *** pa.ticula. sha.e crea.es a.highly coupled relationship between a.rodyna.ics a.d structure,which must be fully considered during the overa.l design process to enha.ce a.rcra.t *** this resea.ch,a. a.ro-structura. design model of the joined-wing a.rcra.t is constructed ba.ed on high-fidelity computa.iona. fluid dyna.ics a.d structura. finite element *** model is a.le to obta.n a.cura.e a.rodyna.ic loa.s for the non-pla.a. wing a.d to simula.e the sta.ica.ly indetermina.e structure of the closed wing *** influence of the joined-wing sha.e pa.a.eters on the a.rodyna.ic a.d structura. disciplines,a. well a. the influence of geometric nonlinea. cha.a.teristics,deformation constra.nts a.d buckling constra.nts on the structura. weight a.e a.l ta.en into *** model is a.plied to complete the a.ro-structura. design optimiza.ion of a.high-a.titude long-endura.ce joined-wing a.rcra.t,a.d wind tunnel tests a.e *** test results verify the credibility of the design model proposed a.d the va.idity of the design environment.

关键词： Joined-wing configura.ion a.rcra.t design a.ro-structura. design Finite element Wind tunnel test

CToMP: a.cycle-ta.k-oriented memory protection scheme for unmanned systems

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Science China.Information Sciences) 2024年第6期67卷 399-417页

作者： Chengya. ma Ning XI Di LU Yebo FENG Jia.feng ma School of Cyber Engineering Xidian University School of Computer Science a.d Technology Xidian University Depa.tment of Computer a.d Information Science University of Oregon

Memory corruption a.ta.ks(MCa.) refer to malicious beha.iors of system intruders tha. modify the contents of a.memory loca.ion to disrupt the normal opera.ion of computing systems, ca.sing lea.a.e of sensitive da.a.or perturba.ions to ongoing processes. Unlike genera.-purpose systems, unmanned systems ca.not deploy complete security protection schemes, due to their limita.ions in size, cost a.d *** in unmanned systems a.e pa.ticula.ly difficult to defend a.a.nst. Furthermore, MCa. ha.e diverse a.d unpredicta.le a.ta.k interfa.es in unmanned systems, severely impa.ting digita. a.d physica. sectors. In this pa.er, we first genera.ize, model a.d ta.onomize MCa. found in unmanned systems currently, la.ing the founda.ion for designing a.porta.le a.d genera. defense a.proa.h. a.cording to different a.ta.k mecha.isms,we found tha. MCa. a.e mainly ca.egorized into two types — return2libc a.d return2shellcode. To ta.kle return2libc a.ta.ks, we model the erra.ic opera.ion of unmanned systems with cycles a.d then propose a.cycle-ta.k-oriented memory protection(CToMP) a.proa.h to protect control flows from ta.pering. To defend a.a.nst return2shellcode a.ta.ks, we introduce a.secure process sta.k with a.ra.domized memory a.dress by levera.ing the memory pool to prevent Shellcode from being executed. Moreover, we discuss the mecha.ism by which CTo MP resists the return-oriented progra.ming(ROP) a.ta.k, a.novel va.ia.t of return2libc a.ta.ks. Fina.ly, we implement CTo MP on CUa. V5+ with a.dupilot a.d Cra.yflie. The eva.ua.ion a.d security a.a.ysis results demonstra.e tha. the proposed a.proa.h CTo MP is resilient to va.ious MCa. in unmanned systems with low footprints a.d system overhea..

关键词： unmanned system memory corruption a.ta.k memory protection system security ra.domized memory a.dress

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