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Review on hea.-to-power conversion technologies for hypersonic vehicles

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Chinese Journa. of a.rona.tics 2024年第5期37卷 148-179页

作者： Yinke QI Xia.feng ma Peixue JIa.G Yinha. ZHU Key La.ora.ory for Thermal Science a.d Power Engineering of Ministry of Educa.ion Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China Beijing Key La.ora.ory of CO_(2)Utiliza.ion a.d Reduction Technology Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China

Hypersonic vehicles ha.e enormous milita.y a.d economic va.ue,while their power a.d thermal protection demands will increa.e substa.tia.ly with the rise in mach number a.d *** the tremendous high-qua.ity hea. on the vehicle surfa.e a.d engine wa.l into electrica. energy through hea.-to-power technologies will not only pla. a.role in thermal protection,but a.so supply power for the *** pa.er provides a.comprehensive review of hea.-to-power conversion technologies on hypersonic vehicles,including the indirect conversion of Bra.ton a.d Ra.kine cycles,direct conversion of thermoelectric materia.s,a.d combined *** the open Bra.ton cycle with hydroca.bon fuel a. the working fluid,the Power-to-Weight Ra.io(PWR)ca. a.hieve the highest,a. a.ound 1.8,due to the high PWR of the hydroca.bon fuel turbine a.d the few components of the ***,its work ca.a.ity is limited by the flow ra.e of the supplied *** closed Bra.ton cycle ca. mainta.n a.relatively high PWR,ra.ging from 0.2 to 0.8,while a.hieving relatively high output power a.d conversion *** Ra.kine cycle ha. a.higher PWR,its ra.ge is close to tha. of the closed Bra.ton cycle,pea.ing a. a.out *** thermoelectric materia.s technology ha. a.small power genera.ion level,making it more suita.le for scena.ios with low power *** review provides a.ba.is for selecting a.d developing hea.-to-power conversion technologies on hypersonic vehicles.

关键词： Hypersonic vehicles Hea.-to-power conversion Bra.ton cycle Ra.kine cycle Thermoelectric materia.s

a.e of Information for Short-Pa.ket Covert Communica.ion with Time Modula.ed Retrodirective a.ra.

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China.Communica.ions 2024年第4期21卷 23-37页

作者： ma Yue ma Ruiqia. Lin Zhi Ya.g Weiwei Ca. Yueming Mia. Chen Wu Wen Key La.ora.ory of Nea.-Ra.ge RF Sensing ICs&Microsystems(NJUST) Ministry of EducationSchool of Electronic and Optical EngineeringNanjing University of Science and TechnologyNanjing 210094China College of Electronic Engineering National University of Defense TechnologyHefei 230037China College of Communica.ions Engineering Army Engineering University of PLANanjing 210007China

In this pa.er,the covert a.e of information(Ca.I),which cha.a.terizes the timeliness a.d covertness performance of communica.ion,is first investiga.ed in the short-pa.ket covert communica.ion with time modula.ed retrodirective a.ra.(TMRDa..Specifica.ly,the TMRDa.is designed to maximize the a.tenna.ga.n in the ta.get direction while the side lobe is sufficiently *** this ba.is,the covertness constra.nt a.d Ca.I a.e derived in closed *** fa.ilita.e the covert tra.smission design,the tra.smit power a.d block-length a.e jointly optimized to minimize the Ca.I,which demonstra.es the tra.e-off between covertness a.d *** results illustra.e tha. there exists a. optimal block-length tha. yields the minimum Ca.I,a.d the presented optimiza.ion results ca. a.hieve enha.ced performance compa.ed with the fixed block-length ***,we observe tha. smaller bea. pointing error a. Bob lea.s to improvements in Ca.I.

关键词： a.e of information covert communica.ion retrodirective a.ra. time modula.ion

Fa.t source mask co-optimiza.ion method for high-Na.EUV lithogra.hy

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Opto-Electronic a.va.ces 2024年第4期7卷 44-54页

作者： Ziqi Li Lisong Dong Xu ma Ya.i Wei EDa.Center Institute of Microelectronics of Chinese Academy of SciencesBeijing 100029China Key La.ora.ory of Photoelectronic Imaging Technology a.d System of Ministry of Educa.ion of China School of Optics and PhotonicsBeijing Institute of TechnologyBeijing 100081China University of Chinese a.a.emy of Sciences Beijing 100049China Gua.gdong Grea.er Ba. a.ea.a.plied Resea.ch Institute of Integra.ed Circuit a.d Systems Guangzhou 510700China

Extreme ultra.iolet(EUV)lithogra.hy with high numerica. a.erture(Na.is a.future technology to manufa.ture the integra.ed circuit in sub-na.ometer ***,source mask co-optimiza.ion(SMO)is a. extensively used a.proa.h for a.va.ced lithogra.hy process beyond 28 nm technology *** work proposes a.novel SMO method to improve the image fidelity of high-Na.EUV lithogra.hy system.a.fa.t high-Na.EUV lithogra.hy imaging model is esta.lished first,which includes the effects of mask three-dimensiona. structure a.d a.a.orphic ***,this pa.er develops a. efficient SMO method tha. combines the gra.ient-ba.ed mask optimiza.ion a.gorithm a.d the compressivesensing-ba.ed source optimiza.ion a.gorithm.a.mask rule check(MRC)process is further proposed to simplify the optimized mask *** illustra.e tha. the proposed SMO method ca. significa.tly reduce the lithogra.hy pa.terning error,a.d mainta.n high computa.iona. efficiency.

关键词： computa.iona. lithogra.hy high-Na.EUV lithogra.hy source-mask co-optimiza.ion lithogra.hy imaging model

Photoinduced superlubricity on TiO_(2) surfa.es

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Friction 2024年第3期12卷 428-438页

作者： Ke Ha. Lira. ma Yu TIa. Jia.bin LUO Sta.e Key La.ora.ory of Tribology in a.va.ced Equipment Tsinghua UniversityBeijing 100084China Received:16 September 2022/Revised:28 October 2022/Accepted:27 December 2022The author(s)2022.

Superlubricity control is of grea. interest in both industry a.d scientific resea.ch,a.d severa. methods ha.e been proposed to a.hieve this *** this work,ultra.iolet(UV)light wa. introduced into tita.ium dioxide(TiO_(2))a.d silicon nitride(Si_(3)N_(4))tribosystems to a.complish photoinduced *** friction coefficients(COFs)between Si_(3)N_(4) ba.ls a.d TiO_(2) pla.es in the mixtures of sulfuric a.id(H^(2)SO_(4))solution a.d glycerol solution were obviously reduced,a.d the system entered the superlubricity region(COFa.ter UV illumina.ion a. a.speed of 56 mm/***,the COF wa. much la.ger without UV trea.ment tha. tha. with UV *** formation of silica.SiO_(2))la.ers on the surfa.es of Si_(3)N_(4) ba.ls a.d the elastohydrodyna.ic effects were determined to be funda.enta. to the low friction in this experiment,a.d the enha.cement of the combina.ion between the TiO_(2) surfa.e a.d the hydroxy group of glycerol by UV illumina.ion wa. the key to the photoinduced superlubricity in this *** findings showed one method for a.hieving superlubricity by introducing a.light field tha. could be further a.plied to specia. working conditions.

关键词： light control friction superlubricity glycerol tita.ium dioxide(TiO_(2))

Wea.a.le multilea. ECG sensing systems using on-skin stretcha.le a.d brea.ha.le dry a.hesives

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Bio-Design a.d manufa.turing 2024年第2期7卷 167-180页

作者： Yingxi Xie Longsheng Lu Wenta. Wa.g Hua. ma School of Mecha.ica. a.d a.tomotive Engineering South China University of TechnologyGuangzhou 510641China College of a.tomotive a.d Mecha.ica. Engineering Changsha University of Science and TechnologyChangsha 410114China Gua.gdong Ca.diova.cula. Institute Guangdong Provincial People’s HospitalGuangzhou 510080China

Electroca.diogra.(ECG)monitoring is used to dia.nose ca.diova.cula. disea.es,for which wea.a.le electronics ha.e a.tra.ted much a.tention due to their lightweight,comfort,a.d long-term *** study developed a.wea.a.lemultilea. ECG sensing system with on-skin stretcha.le a.d conductive silver(a.)-coa.ed fiber/silicone(a.CF-S)dry *** a.d normal a.hesion to pigskin(0.43 a.d 0.20 N/cm2,respectively)wa. optimized by the a.tive control of fiber density a.d mixing ra.io,resulting in close conta.t in the electrode–skin *** brea.ha.lea.CF-S dry electrodewa. nona.lergenic a.ter continuous fit for 24 h a.d ca. be reused/clea.ed(>100 times)without loss of *** a.CF enca.sula.ed inside silicone elastomers wa. overla.ped to construct a.dyna.ic network under repea.ed stretching(10%stra.n)a.d bending(90°)deformations,ena.ling small intrinsic impeda.ce(0.3,0.1 Hz)a.d conta.t impeda.ce va.ia.ion(0.7 k)in high-frequency vibra.ion(70 Hz).a.l ha.d/soft modules of the multilea. ECG system were integra.ed into lightweight clothing a.d equipped with wireless tra.smission for signa. *** synchronous a.quisition of I–III,a.R,a.L,a.F,a.d V4 lea. da.a.the multilea. ECG sensing system wa. suita.le for va.ious scena.ios,such a. exercise,rest,a.d sleep,with extremely high signa.-to-noise ra.ios.

关键词： Multilea. electroca.diogra. Dry electrodes Wea.a.le electronics Wireless tra.smission

Integra.ion of ea.th-a.unda.t coca.a.ysts for high-performance photoelectrochemica. energy conversion

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Journa. of Energy Chemistry 2024年第1期88卷 336-355,I0008页

作者： Joonhee ma Sa.g Hyun a.n Soo Young Kim Depa.tment of materia.s Science a.d Engineering Korea UniversitySeoul 02841Republic of Korea School of Chemica. Engineering a.d materia.s Science Chung-Ang University84 Heukseok-roDongjak-guSeoul 06974Republic of Korea

Photoelectrochemica.(PEC)energy conversion ha. emerged a. a.promising a.d efficient a.proa.h to susta.na.le energy ha.vesting a.d *** utilizing semiconductor photoelectrodes,PEC devices ca. ha.ness sola. energy a.d drive electrochemica. rea.tions such a. wa.er splitting or ca.bon dioxide(CO_(2))reduction to genera.e clea. fuels a.d va.ue-a.ded ***,PEC energy conversion fa.es severa. cha.lenges such a. high overpotentia.,sluggish rea.tion kinetics,cha.ge ca.rier recombina.ion,a.d sta.ility issues,which limit its pra.tica. ***,significa.t resea.ch ha. been conducted to improve the overa.l conversion efficiency of PEC *** pa.ticula.ly promising a.proa.h is the use of coca.a.ysts,which involves introducing specific coca.a.ysts onto the photoelectrode surfa.e to promote cha.ge sepa.a.ion,improve rea.tion kinetics,a.d reduce the overpotentia.,thereby enha.cing the overa.l performance of PEC energy *** review provides a.comprehensive overview of the recent developments in the ea.th-a.unda.t coca.a.ysts for PEC wa.er splitting a.d CO_(2) *** main ea.th-a.unda.t ca.a.ysts for the PEC wa.er splitting include tra.sition-meta. dicha.cogenide(TMD)-ba.ed materia.s,meta. phosphides/ca.bides,a.d meta. oxides/***,PEC-CO_(2)RR wa. divided into C_(1) a.d C_(2+)ba.ed on the fina. product since va.ious products could be produced,focusing on diverse ea.th-a.unda.t materia.s-ba.ed *** a.dition,we provide a.d highlight key a.va.cements a.hieved in the very recent reports on novel PEC system design engineering with ***,the current problems a.socia.ed with PEC systems a.e discussed a.ong with a.suggested direction to overcome these obsta.les.

关键词： Sola. energy Photo-electrochemica. Wa.er splitting CO_(2)reduction Coca.a.ysts

a.a.ysis of piezoelectric semiconductor fibers under gra.ient tempera.ure cha.ges

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a.plied mathematics a.d Mecha.ics(English Edition) 2024年第2期45卷 311-320页

作者： Shua.gpeng LI Ruora. CHENG Na.na. ma Chunli ZHa.G Depa.tment of Engineering Mecha.ics Zhejiang UniversityHangzhou 310027China

Piezoelectric semiconductors(PSs)possess both semiconducting properties a.d piezoelectric coupling effects,making them optimal building blocks for semiconductor *** fiber-like structures ha.e wide a.plica.ions in multi-functiona. semiconductor *** this pa.er,a.one-dimensiona.(1D)theoretica. model is esta.lished to describe the piezotronic responses of a.PS fiber under gra.ient tempera.ure *** theoretica. model a.ms to expla.n the mecha.ism behind the resista.ce cha.ge ca.sed by such gra.ient tempera.ure *** results demonstra.e tha. a.gra.ient tempera.ure cha.ge significa.tly a.fects the physica. fields within the PS fiber,a.d ca. induce cha.ges in its surfa.e *** provides importa.t theoretica. guida.ce on the development of piezotronic devices tha. a.e sensitive to tempera.ure effects.

关键词： piezoelectric semiconductor(PS)fiber one-dimensiona.(1D)model piezotronic effect gra.ient tempera.ure cha.ge

Sequestra.ion of helium a.d xenon via.iron-ha.ide compounds in ea.ly Ea.th

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matter a.d Ra.ia.ion a. Extremes 2024年第3期9卷 83-88页

作者： Jurong Zha.g Ha.yu Liu Cha.gfeng Chen Ya.ming ma Key La.ora.ory of materia. Simula.ion Methods a.d Softwa.e of Ministry of Educa.ion a.d Sta.e Key La.ora.ory of Superha.d materia.s College of PhysicsJilin UniversityChangchun 130012China School of Physics a.d Electronics Shandong Normal UniversityJinan 250014China Interna.iona. Center of Future Science Jilin UniversityChangchun 130012China Depa.tment of Physics a.d a.tronomy University of NevadaLas VegasNevada 89154USA

The terrestria. a.unda.ce a.omalies of helium a.d xenon suggest the presence of deep-Ea.th reservoirs of these elements,which ha. led to grea. interest in sea.ching for materia.s tha. ca. host these usua.ly unrea.tive ***,using a. a.va.ced crysta. structure sea.ch a.proa.h in conjunction with first-principles ca.cula.ions,we show tha. severa. Xe/He-bea.ing iron ha.ides a.e thermodyna.ica.ly sta.le in a.broa. region of P–T pha.e spa.e below 60 *** results present a.compelling ca.e for sequestra.ion of He a.d Xe in the ea.ly Ea.th a.d may suggest their much wider distribution in the present Ea.th tha. previously *** findings offer insights into key materia.-ba.ed a.d physica. mecha.isms for elucida.ing major geologica. phenomena.

关键词： ha.ide sea.ching insight

Ra.dom Ra.0}n Fiber La.er a. a.Liquid Refra.tive Index Sensor

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Photonic Sensors 2024年第1期14卷 13-22页

作者： Bing Ha. Yuxi ma Ha. WU Yong ZHa. College of Information Science a.d Engineering Northeastern UniversityShenyang 110819China Hebei Key La.ora.ory of Micro-Na.o Precision Optica. Sensing a.d Mea.urement Technology Qinhuangdao 066004China College of Electronics a.d Information Engineering Sichuan UniversityChengdu 610064China

In this pa.er,a.new concept of forwa.d-pumped ra.dom Ra.0}n fiber la.er(RRFL)-ba.ed liquid refra.tive index sensing is proposed for the first *** liquid refra.tive index sensing,the fla. fiber end immersed in the liquid ca. a.t a. the point reflector for genera.ing ra.dom fiber la.ing a.d a.so a. the sensing *** to the high sensitivity of the output power of the RRFL to the reflectivity provided by the point reflector in the ultra.ow reflectivity regime,the proposed RRFL is ca.a.le of a.hieving liquid refra.tive index sensing by mea.uring the ra.dom la.ing output *** theoretica.ly investiga.e the effects of the opera.ing pump power a.d fiber length on the refra.tive index sensitivity for the proposed *** a.proof-of-concept demonstra.ion,we experimenta.ly rea.ize high-sensitivity ha.f-open short-ca.ity RRFL-ba.ed liquid refra.tive index sensing with the maximum sensitivity a.d the sensing resolution of-39.88W/RIU a.d 2.5075×10^(-5) RIU,*** a.so experimenta.ly verify tha. the refra.tive index sensitivity ca. be enha.ced with the shorter fiber length of the *** work extends the a.plica.ion of the ra.dom fiber la.er a. a.new pla.form for highly-sensitive refra.tive index sensing in chemica.,biomedica.,a.d environmenta. monitoring a.plica.ions,etc.

关键词： Fiber optic sensors refra.tive index mea.urements fiber la.ers Ra.leigh sca.tering stimula.ed Ra.0}n sca.tering