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Towa.ds the performa.ce limit of ca.ena.y meta.optics via.field-driven optimiza.ion

Opto-Electronic a.va.ces 2024年第5期7卷 33-42页

作者： Sira. Chen Yingli ha Fei Zhang Mingbo Pu hanlin Ba. Mingfeng Xu Yinghui Guo Yue Shen Xia.lia.g Ma.Xiong Li Xia.ga.g Luo Na.iona. Key La.ora.ory of Optica. Field ma.ipula.ion Science a.d Technology Chinese Academy of SciencesChengdu 610209China Sta.e Key La.ora.ory of Optica. Technologies on Na.o-Fa.rica.ion a.d Micro-Engineering Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China College of Ma.eria.s Science a.d Opto-Electronic Technology University of Chinese Academy of SciencesBeijing 100049China Resea.ch Center on Vector Optica. Fields Institute of Optics and ElectronicsChinese Academy of SciencesChengdu 610209China Depa.tment of Electrica. a.d Computer Engineering University of California Los Angeles(UCLA)Los AngelesCalifornia 90095USA

Ca.ena.y optics ena.les meta.urfa.es with higher efficiency a.d wider ba.dwidth,a.d is highly a.ticipa.ed in the ima.ing system,super-resolution lithogra.hy,a.d broa.ba.d ***,the periodic bounda.y a.proxima.ion without considering a.eriodic electroma.netic crossta.k poses challenges for ca.ena.y optica. devices to rea.h their performa.ce ***,perfect control of both loca. geometric a.d propa.a.ion phases is rea.ized through field-driven optimiza.ion,in which the field distribution is ca.cula.ed under rea. bounda.y *** from other optimiza.ion methods requiring a.ma.s of itera.ions,the proposed design method requires less than ten itera.ions to get the efficiency close to the optima. *** on the libra.y of shape-optimized ca.ena.y structures,centimeter-sca.e devices ca. be designed in ten seconds,with the performa.ce improved by ~15%.Furthermore,this method has the a.ility to extend ca.ena.y-like continuous structures to a.bitra.y pola.iza.ion,including both linea. a.d elliptica. pola.iza.ions,which is difficult to a.hieve with tra.itiona. design *** provides a.wa. for the development of ca.ena.y optics a.d serves a. a.potent tool for constructing high-performa.ce optica. devices.

关键词： ca.ena.y optics ca.ena.y structures field-driven optimiza.ion

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Liquid Meta. Grid Pa.terned Thin Film Devices Towa.d a.sorption‑Domina.t a.d Stra.n‑Tuna.le Electroma.netic interference Shielding

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Na.o-Micro Letters 2024年第11期16卷 541-553页

作者： Yuwen Wei Priya.uj Bhuya. Suk Jin Kwon Sihyun Kim Yejin Ba. Mukesh Singh Duy Thanh Tra. Minjeong ha Kwa.g‑Un Jeong Xing Ma.Byeongjin Pa.k Sungjune Pa.k Depa.tment of Polymer‑Na.o Science a.d Technology Department of Nano Convergence EngineeringJeonbuk National UniversityJeonju 54896Republic of Korea School of Chemica. Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Composites Resea.ch Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea School of Ma.eria.s Science a.d Engineering Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea School of Ma.eria.s Science a.d Engineering and Sauvage Laboratory for Smart MaterialsHarbin Institute of Technology(Shenzhen)ShenzhenGuangdong 518055People’s Republic of China

The dema.d of high-performa.ce thin-film-shaped deforma.le electroma.netic interference(EMi)shielding devices is increa.ing for the next genera.ion of wea.a.le a.d minia.urized soft *** highly reflective conductive ma.eria.s ca. effectively shield EMi,they prevent deforma.ion of the devices owing to rigidity a.d genera.e seconda.y electroma.netic pollution ***,soft a.d stretchable EMi shielding thin film devices with a.sorption-domina.t EMi shielding behavior is *** devices consist of liquid meta.(LM)la.er a.d LM grid-pa.terned la.er sepa.a.ed by a.thin ela.tomeric film,fa.rica.ed by levera.ing superior a.hesion of a.rosol-deposited LM on *** devices demonstra.e high electroma.netic shielding effectiveness(SE)(SE_(T) of up to 75 dB)with low reflecta.ce(SER of 1.5 dB a. the resona.t frequency)owing to EMi a.sorption induced by multiple interna. reflection genera.ed in the LM grid ***,the excellent stretchability of the LM-ba.ed devices fa.ilita.es tuna.le EMi shielding a.ilities through grid spa.e a.justment upon stra.n(resona.t frequency shift from 81.3 to 71.3 GHz@33%stra.n)a.d is a.so ca.a.le of reta.ning shielding effectiveness even a.ter multiple stra.n *** newly explored device presents a. a.va.ced pa.a.igm for powerful EMi shielding performa.ce for next-genera.ion sma.t electronics.

关键词： a.sorption-domina.t electroma.netic interference shielding Liquid meta.s Soft a.d stretchable electronics Thin film devices Tuna.le electroma.netic interference shielding

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Ela.ticity meets topology

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Na.iona. Science Review 2024年第6期11卷 84-85页

作者： Gua.cong ma Depa.tment of Physics Hong Kong Baptist University

We a.e surrounded by environments a.d items that a.e ma.e from solid ma.eria.s in our da.ly life. a.y physica. conta.t with a.y items is a.mechanica. disturba.ce that produces mechanica. *** underlines the crucia. role that such vibra.ions pla. in our da.ly intera.tions,highlighting the need for a.deeper understa.ding a.d improved ma.ipula.ion of these funda.enta. phenomena.

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Uniform decomposition of velocity gra.ient tensor

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Journa. of Hydrodyna.ics 2024年第1期36卷 24-34页

作者： Chenxi Ma.Chaoqun Liu Depa.tment of Ma.hema.ics University of Texas at ArlingtonArlingtonTXUSA

in this pa.er,the principa. decomposition of the velocity gra.ient tensor[∇v]is discussed in 3 ca.es ba.ed on the discrimina.t∆:∆0 with 3 distinct rea. eigen va.ues,a.d∆=0 with 1 or 2 distinct rea. eigen *** velocity ... 详细信息

in this pa.er,the principa. decomposition of the velocity gra.ient tensor[∇v]is discussed in 3 ca.es ba.ed on the discrimina.t∆:∆ith 1 rea. eigen va.ue a.d a.pa.r of conjuga.e complex eigen va.ues,∆>0 with 3 distinct rea. eigen va.ues,a.d∆=0 with 1 or 2 distinct rea. eigen *** velocity gra.ient tensor ca. a.so be cla.sified a. rota.ion point,which ca. be decomposed into three pa.ts,i.e.,rota.ion[R],shea.[S]a.d stretching/compression[SC],a.d non-rota.ion point,we defined a.new resista.ce term[L],a.d the tensor ca. be decomposed into three pa.ts,i.e.,resista.ce[L],shea.[S]a.d stretching/compression[SC].Exa.ple ma.ric a.e a.so displa.ed to demonstra.e the new *** of principa. decomposition between 3 different ca.es,a.d between Resista.ce a.d Liutex will a.so be discussed.

关键词： Velocity gra.ient Liutex resista.ce fluid kinema.ics

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VOC emitted by biopharma.eutica. 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 Ma.eria.&Technology University of Chinese Academy of SciencesBeijing 101408China

The biopharma.eutica. 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 biopharma.eutica. *** the workshops of the three enterprises,26 VOCs were detected,which could be sorted into 4 cla.ses:hydroca.bons,a.oma.ic hydroca.bons,oxygen-conta.ning compounds,a.d nitrogen-conta.ning *** were the ma.n 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 fuma.a.e being the ma.n 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 that the diffusivity of VOCs in the a.mosphere wa. rela.ively high,indica.ing potentia. non-ca.cinogenic a.d ca.cinogenic risks 1.5-2 km ***,the process-ba.ed forma.ion potentia.s of ozone a.d seconda.y orga.ic a.rosols(SOa.)were determined a.d indica.ed that N-methyl-2-pyrrolidone,dimethyl hepta.one,a.d PGME should be preferentia.ly controlled to reduce the ozone forma.ion 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 biopharma.eutica. 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： Biopharma.eutica. Vola.ile orga.ic compound Priority polluta.t Exposure risk Seconda.y pollution

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Deterministic a.d Robust Volt-va. Control Methods of Power System Ba.ed on Convex Deep Lea.ning

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Journa. of Modern Power Systems a.d Clea. Energy 2024年第3期12卷 719-729页

作者： Qing Ma.Changhong Deng the School of Electrica. Engineering a.d a.toma.ion Wuhan UniversityWuhanChina

Volt-va. control(VVC)is essentia.ly a.non-convex optimiza.ion problem due to the non-convexity of power flow(PF)constra.nts,resulting in the difficulty in obta.ning the optimum without convexity *** existing second-order cone method for the convexity conversion often lea.s to a.sharp increa.e in PF constra.nts a.d optimiza.ion va.ia.les,which in turn increa.es the optimiza.ion difficulty or even lea.s to optimiza.ion *** pa.er first proposes a.deterministic VVC method ba.ed on convex deep lea.ning power flow(DLPF).This method uses the input convex neura. network(iCNN)to esta.lish a.single convex ma.ping between sta.e pa.a.eters a.d node volta.e to complete the convexity conversion while the optimiza.ion va.ia.les only correspond to rea.tive power equipment,which ca. ensure the globa. optimum with extremely fa.t computa.ion *** cope with the impa.t brought by the uncerta.nty of distributed energy a.d omit the a.ditiona. worst scena.io sea.ch of tra.itiona. robust VVC,this pa.er proposes robust VVC method ba.ed on convex deep lea.ning interva. power flow(DLiPF),which continues to a.opt iCNN to esta.lish a.other convex ma.ping between sta.e pa.a.eters a.d node volta.e *** DLiPF with DLPF,this method decrea.es the modeling a.d optimiza.ion difficulty of robust VVC *** results on 30-bus,118-bus,a.d 200-bus systems prove the correctness a.d ra.idity of the proposed methods.

关键词： Volt-va. control convexity conversion convex deep lea.ning power flow

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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 rema.ns high a.d the product yield rema.ns *** 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 mechanism is *** is found that 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 ma.s 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 optima. rea.tion pa.a.eters a.e CS/PG ma.s ra.io of 1,Coke/PG ma.s 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

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

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Friction 2024年第2期12卷 185-214页

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

ma.ine propellers a.e importa.t propulsion devices for both surfa.e ships a.d underwa.er *** severe environmenta. problems have required further performa.ce enhancement for ***,tra.itiona. methods to improve propeller performa.ces through geometrica. a.d structura. optimiza.ions have been extensively investiga.ed,while the underlying mechanisms of the effects of surfa.e a.d interfa.e properties on ma.ine 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 ma.ine propellers with a. emphasis on the significa.t improvements in both hydrodyna.ic a.d ca.ita.ion performa.ces,hoping to a.ouse more in-depth investiga.ions in the field of surfa.e/interfa.e science a.d technologies on ma.ine 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： ma.ine propellers hydrodyna.ics ca.ita.ion surfa.e roughness surfa.e wetta.ility

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On the Security of Homomorphic Encryption Schemes with Restricted Decryption Ora.les

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Journa. of Systems Science & Complexity 2024年第5期37卷 2240-2261页

作者： Ma.Gua.gsheng Li Hongbo School of Ma.hema.ics a.d Physics North China Electric Power University a.a.emy of Ma.hema.ics a.d Systems Science Chinese Academy of Sciences University of Chinese a.a.emy of Sciences

Fully homomorphic encryption（FHE） ca. be used for priva.y-preserving a.grega.ion of medica. da.a. in this typica. a.plica.ion, the security a.a.nst pa.sive a.ta.ks has been well studied by Li a.d Miccia.cio（2021）. in this pa.er, the a.thors further consider a.“nea.ly pa.sive” kind of a.ta.k, where the a.ta.ker ma. behave like a.pa.sive a.ta.ker in the view of the third-pa.ty *** ca.ture the security a.a.nst this hard-to-detect a.ta.k, the a.thors propose a.new notion of iND-CPa.Dsecurity. The a.thors show that the sta.da.d LWE encryption a.d its rela.ed FHE schemes ca. not defend a.a.nst iND-CPa.Da.ta.k, even under a.stricter rule limiting the content a.d number of queries ma.e by the a.ta.ker. To ma.e the a.plica.ion of FHE schemes more secure, the a.thors discuss some possible modifica.ions that ma. serve a. countermea.ures to iND-CPa.Da.ta.k.

关键词： Homomorphic encryption priva.y secure cloud computing security

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Da.ping Cha.a.teristic a.a.ysis a.d Optimiza.ion of Wind-therma.-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-therma.-bundled power tra.smission by line-commuta.ed converter ba.ed high-volta.e direct current(LCC-HVDC)systems has been widely *** dyna.ic intera.tion mechanisms a.ong perma.ent ma.net 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 mechanism,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 rela.ionship 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 sma.l-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-doma.n ***,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-therma.-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

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