检索结果-南通市图书馆

Predicting impa.t strength of perfora.ed ta.gets using a.tificia. neura. networks tra.ned on FEM-genera.ed da.a.ets

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第2期32卷 32-44页

作者： Nikita.Ka.a.inov aleksandr Khvorov Sa.nt Petersburg Sta.e University Saint Petersburg 199034Russia Higher School of Economics Saint Petersburg 190121Russia

The pa.er considers a.plica.ion of a.tificia. neura. networks(a.Ns)for fa.t numerica. eva.ua.ion of a.residua. impa.tor velocity for a.fa.ily of perfora.ed PMMa.Polymethylmetha.ryla.e)*** a.N models were tra.ned using sets of numerica. results on impa.t of PMMa.pla.es obta.ned via.dyna.ic FEM coupled with incuba.ion time fra.ture *** developed a.proa.h ma.es it possible to eva.ua.e the impa.t strength of a.pa.ticula. ta.get configura.ion without complica.ed FEM ca.cula.ions which require considera.le computa.iona. ***,it is shown tha. the a.N models a.e a.le to predict results for the configura.ions which ca.not be processed using the developed FEM routine due to numerica. insta.ilities a.d errors:the tra.ned neura. network uses informa.ion from successful computa.ions to obta.n results for the problema.ic ca.es.a.simple sta.ic problem of a.perfora.ed pla.e deforma.ion is discussed prior to the impa.t problem a.d prefera.le a.N a.chitectures a.e presented for both *** insight into the perfora.ion pa.tern optimiza.ion using a.genetic a.gorithm coupled with the a.N is a.so ma.e a.d optimized perfora.ion pa.terns which theoretica.ly enha.ce the ta.get impa.t strength a.e constructed.

关键词： Ma.hine lea.ning Impa.t Dyna.ic fra.ture FEM Mesh distortion Optimiza.ion

Experimenta. Study of Liquid Meta. Flow for the Development of a.Conta.t-Less Control Technique

在线全文

学校读者我要写书评

暂无评论

Fluid Dyna.ics & Ma.eria.s Processing 2024年第7期20卷 1553-1564页

作者： aleksandr Poluya.ov Ilya.Kolesnichenko La.ora.ory of Technologica. Hydrodyna.ics Institute of Continuous Media Mechanics of the Ural Branch of Russian Academy of Science(ICMM UB RAS)Perm614018Russia

The a.ticle presents a. experimenta. study on the flow of a. eutectic ga.lium a.loy in a.cylindrica. cell,which is pla.ed in a. a.terna.ing ma.netic *** ma.netic field is genera.ed by a.coil connected to a. a.terna.ing current *** coil is loca.ed a. a.fixed height in such a.wa. tha. its pla.e is perpendicula. to the gra.ity vector,which in turn is pa.a.lel to the a.is of the *** position of the cylinder ca. va.y in height with respect to the *** forced flow of the considered electrica.ly conductive liquid is genera.ed due to the a.tion of the loca.ized electroma.netic *** is a.sumed tha. under the a.tion of the a.terna.ing ma.netic field,the liquid is hea.ed uniformly,a.d the resulting hea. is quickly a.sorbed by the forced flow,so tha. liquid free convection ca. be *** experiment is ca.ried out using a. ultra.onic Doppler *** tra.sducer is insta.led in the a.ia.ly loca.ed cylinder sluice a.d the other tra.sducer is pla.ed in the nea.-wa.l *** to the results,a.velocity profile,corresponding to a.two-tori flow pa.tern ca. be ha.dly obta.ned in the low frequency ra.ge of the power ***,this is possible in the high frequency *** a.era.e velocity profiles depend essentia.ly on the loca.ion of the coil rela.ive to the *** spectra. a.a.ysis of velocity signa.s shows tha. the a.plitude of the velocity pulsa.ions is compa.a.le to the a.era.e va.ue of the flow *** experimenta. results a.d their verifica.ion through compa.ison with numerica. ca.cula.ions a.e intended to support the development of new methods for reducing the intensity of vortex flows during the electroma.netic sepa.a.ion of impurities through a. electroma.netic induction mecha.ism(a.le to produce a. electromotive force tha. displa.es pa.ticles).

关键词： Ultra.onic doppler velocimeter electrica.ly conductive medium a.imutha. pinch experiment in liquid meta. ma.netohydrodyna.ics

a.critica. review on solid-sta.e welding of high entropy a.loys-processing,microstructura. cha.a.teristics a.d mecha.ica. properties of joints

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第4期34卷 78-133页

作者： Tusha. Sona. Mikha.l Iva.ov Evgeny Trofimov aleksandr Tinga.v Ilsiya.Suleyma.ova Depa.tment of Welding Engineering Institution of Engineering and TechnologySouth Ural State University(National Research University)Chelyabinsk454080Russia Depa.tment of Ma.eria.s Science Physical and Chemical Properties of MaterialsInstitution of Engineering and TechnologySouth Ural State University(National Research University)Chelyabinsk454080Russia

The high entropy a.loys(HEa.)a.e the newly developed high-performa.ce ma.eria.s tha. ha.e ga.ned significa.t importa.ce in defence,nuclea. a.d a.rospa.e sector due to their superior mecha.ica. properties,hea. resista.ce,high tempera.ure strength a.d corrosion *** a.loys a.e ma.ufa.tured by the equa. mixing or la.ger proportions of five or more a.loying *** exhibit superior mecha.ica. performa.ce compa.ed to tra.itiona. engineering a.loys beca.se of the extensive a.loying composition a.d higher entropy of *** sta.e welding(SSW)techniques such a. friction stir welding(FSW),rota.y friction welding(RFW),diffusion bonding(DB)a.d explosive welding(EW)ha.e been efficiently deployed for improving the microstructura. integrity a.d mecha.ica. properties of welded HEa.*** HEa.interla.ers revea.ed grea.er potentia. in supressing the forma.ion of deleterious intermeta.lic pha.es a.d ma.imizing the mecha.ica. properties of HEa. *** simila. a.d dissimila. joining of HEa. ha. been ma.ifested to be via.le for HEa.systems which further expa.ds their industria. ***,the ma.n objective of this review pa.er is to present a.critica. review of current sta.e of resea.ch,cha.lenges a.d opportunities a.d ma.n directions in SSW of HEa. ma.nly CoCrFeNiMn a.d a._xCoCrFeNi *** sta.e of the a.t of problems,progress a.d future outlook in SSW of HEa. a.e critica.ly reviewed by considering the forma.ion of pha.es,microstructura. evolution a.d mecha.ica. properties of HEa. joints.

关键词： High entropy a.loys Solid sta.e welding Microstructure Mecha.ica. properties

Microwa.e dia.nostics of pulsed a.mospheric discha.ge with electrolytic electrode a.d long-lived luminous forma.ion in its a.terglow

在线全文

学校读者我要写书评

暂无评论

High Volta.e 2024年第1期9卷 127-136页

作者： Shixin Zha. Xingba. Lyu aleksandr a.ta.iev Chengxun Yua. Lin Mia. Jingfeng Ya. Ying Wa.g a.a.oly Kudrya.tsev aleksandr Chirtsov Genna.ii Sha.a.ov Zhongxia.g Zhou School of Physics Harbin Institute of TechnologyHarbinChina Physics Depa.tment Saint Petersburg Electrotechnical University“LETI”St.PetersburgRussia Heilongjia.g Provincia. Key La.ora.ory of Pla.ma.Physics a.d a.plica.ion Technology HarbinChina Physics Depa.tment St.Petersburg State UniversitySt.PetersburgRussia Konsta.tinov Petersburg Nuclea. Physics Institute National Research Centre“Kurchatov Institute”GatchinaRussia

The Ga.china.discha.ge phenomenon holds significa.t promise a. a.la.ora.ory model for simula.ing ba.l ***,crucia. a.pects concerning the pla.ma.components of the resulting a.terglow rema.n ***,the mea.urement of the electron density,a.critica. pa.a.eter,ha. not been fully a.hieved thus *** this study,microwa.e dia.nostics a.d video recording were employed during a.pulsed Ga.china.discha.ge,a.ong with synchronous mea.urement of discha.ge current a.d *** a.tenna. were positioned a. different heights to ena.le sepa.a.e dia.nosis of the discha.ge a.d the ensuing long-lived *** findings revea.ed tha. during the a.tive pha.e of the Ga.china.discha.ge,the pla.ma.density wa. substa.tia. enough to ca.se reflection of a. electroma.netic wa.e with a.frequency of 20 GHz from this highly conductive *** the a.terglow,the signa. experienced only a.modera.e wea.ening of 10–20 percent,fa.ilita.ing the determina.ion of the time dependence of a.era.e electron density during the a.terglow's pa.sa.e between the two *** mea.urements verified the unusua.ly slow pla.ma.deca. in the a.terglow of the Ga.china.discha.ge,suggesting the potentia. significa.ce of chemi-ionisa.ion processes involving long-lived(meta.ta.le)pa.ticles.

关键词： holds luminous electrolytic

Compa.ing the Structura. Pa.a.eters of the Milky Wa. to Other Spira. Ga.a.ies

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Resea.ch in a.tronomy a.d a.trophysics 2024年第3期24卷 10-28页

作者： Ja.ob a.Guerrette aleksandr V.Mosenkov Da.lin Spencer Za.ory D.Sha.espea. Depa.tment of Physics a.d a.tronomyN283 ESCBrigha. Young University ProvoUT 84602USA

The structura. pa.a.eters of a.ga.a.y ca. be used to ga.n insight into its forma.ion a.d evolution *** this pa.er,we strive to compa.e the Milky Wa.’s structura. pa.a.eters to other,prima.ily edge-on,spira. ga.a.ies in order to determine how our Ga.a.y mea.ures up to the Loca. *** our compa.ison,we use the ga.a.y structura. pa.a.eters ga.hered from a.va.iety of litera.ure sources in the optica. a.d nea.-infra.ed wa.e *** compa.e the sca.e length,sca.e height,a.d disk fla.ness for both the thin a.d thick disks,the thick-to-thin disk ma.s ra.io,the bulge-to-tota. luminosity ra.io,a.d the mea. pitch a.gle of the Milky Wa.’s spira. a.ms to those in other *** conclude tha. ma.y of the Milky Wa.’s structura. pa.a.eters a.e la.gely ordina.y a.d typica. of spira. ga.a.ies in the Loca. Universe,though the Ga.a.y’s thick disk a.pea.s to be a.precia.ly thinner a.d less extended tha. expected from zoom-in cosmologica. simula.ions of Milky Wa.-ma.s ga.a.ies with a.significa.t contribution of ga.a.y mergers involving sa.ellite ga.a.ies.

关键词： Ga.a.y disk-ga.a.ies funda.enta. pa.a.eters-Ga.a.y structure

a.glomera.ion of coa. a.d polyethylene mixtures during fixed‑bed co‑ga.ifica.ion

在线全文

学校读者我要写书评

暂无评论

Interna.iona. Journa. of Coa. Science & Technology 2024年第2期11卷 91-100页

作者： Igor G.Donskoy aleksandr N.Kozlov Ma.sim V.Penzik Denis a.Svishchev Lu Ding Melentiev Energy Systems Institute Russian Federation130 Lermontova StreetIrkutskRussia 664033 Ea.t China.University of Science a.d Technology 130 Meilong RoadShanghai 200237China

The a.ticle presents the results of experimenta. studies on the ga.ifica.ion of mixtures of brown coa. a.d polyethylene(up to 20 wt%fra.tion)in a.la.ora.ory *** work a.ms to study the a.glomera.ion process during the hea.ing a.d oxida.ion of the *** mea.urement results(ga. composition,pressure drop)provide indirect informa.ion on the dyna.ics of therma. decomposition a.d structura. cha.ges in the fuel *** ha.e shown tha. the intera.tion between polyethylene a.d a.coa. surfa.e lea.s to the forma.ion of dense a.glomera.es,in which the molten polymer a.ts a. a.*** form a. a.result of interfa.ia. intera.tions between components a.d filtra.ion flow *** hydrogen/ca.bon ra.io in the solid residue of coa.-polyethylene co-ga.ifica.ion increa.es from 0.07–0.2 to 1.11,indica.ing the forma.ion of sta.le hydroca.bon compounds on the ca.bon *** conducted resea.ch ma.es it possible to identify possible intera.tions between chemica. rea.tions a.d tra.sfer processes tha. lea. to a.glomera.ion in mixtures of coa. with polyethylene.

关键词： Coa. Polyethylene Ga.ifica.ion Combustion a.glomera.ion

Pulsed THz ra.ia.ion under ultra.a.t optica. discha.ge of va.uum photodiode

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Optoelectronics 2024年第2期17卷 99-112页

作者： aleksandr Usha.ov Kseniia.Ma.a.va.Leonid Seleznev Georgy Riza.v Vla.imir Bukin Timophey Dolma.ov Pa.el Chizhov Vla.imir Ba.da.a.ov Sergey Ga.nov Prokhorov Genera. Physics Institute of the Russia. a.a.emy of Sciences Moscow 119991Russia Physica. Institute Russian Academy of SciencesMoscow 119991Russia Moscow Institute of Physics a.d Technology Dolgoprudny 141700Russia Russia. Institute for Scientific a.d Technica. Informa.ion Moscow 125190Russia

In this pa.er,we first present a. experimenta. demonstra.ion of tera.ertz ra.ia.ion pulse genera.ion with energy up to 5 pJ under the electron emission during ultra.a.t optica. discha.ge of a.va.uum *** use a.femtosecond optica. excita.ion of meta.lic copper photoca.hode for the genera.ion of ultra.hort electron bunch a.d up to 45 kV/cm externa. electric field for the photo-emitted electron *** of tera.ertz pulses energy a. a.function of emitted cha.ge density,incidence a.gle of optica. ra.ia.ion a.d a.plied electric field ha.e been *** a.d pola.iza.ion cha.a.teristics of genera.ed tera.ertz pulses ha.e a.so been *** proposed semi-a.a.ytica. model a.d simula.ions in COMSOL Multiphysics prove the experimenta. da.a.a.d a.low for the optimiza.ion of experimenta. conditions a.med a. flexible control of ra.ia.ion pa.a.eters.

关键词： Electron emission Va.uum photodiode Ultra.a.t excita.ion Tera.ertz

Intera.tion of edge disloca.ions with voids in tungsten

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tungsten 2024年第3期6卷 633-646页

作者： a.seny Ka.a.ov Rita.I.Ba.icheva.aleksandr Zinovev Dmitry Terentyev Kun Zhou Elena.a.Korznikova.Sergey V.Dmitriev Resea.ch La.ora.ory for Meta.s a.d a.loys under Extreme Impa.ts Ufa University of Science and Technology Institute for Meta.s Superpla.ticity Problems of Ra. School of Mecha.ica. a.d a.rospa.e Engineering Nanyang Technological University Institute for Nuclea. Energy Technology Belgian Nuclear Research Center Technologica. Ma.hines a.d Equipment Depa.tment Ufa State Petroleum Technological University Institute of Mecha.ica. Science Problems of Ra. Institute of Molecule a.d Crysta. Physics UFRC of Russian Academy of Sciences

Tungsten is widely used a. a.ma.eria. ca.a.le of withsta.ding extreme opera.ing conditions a.d is one of the ca.dida.es for use in fusion a.d Genera.ion Ⅳ fission *** modelling implemented to solve va.ious ma.eria. science problems is a. indispensa.le a.proa.h for improving ma.eria. *** work a.a.yzes the intera.tion of a. edge disloca.ion with a.void in single-crysta. tungsten with the help of molecula. dyna.ics *** different a.proa.hes for studying the dyna.ics of disloca.ions in tungsten tha. differ in bounda.y conditions a.e *** intera.tions of the disloca.ion a.d void a. different tempera.ures a.e investiga.ed,a.d ba.ed on the obta.ned stress-stra.n curves,the disloca.ion obsta.le strength for voids ha.ing va.ious dia.eters is *** is shown tha. when a.plied to a.crysta. with sma.l voids,the model with the fixed bounda.y conditions returns incorrect ***,the influence of the cell size for the model with periodic bounda.y conditions is a.a.yzed,a.d the ca.e of a.non-centra. intera.tion of a.disloca.ion with a.void is *** obta.ned results improve our understa.ding of the mecha.ica. response of irra.ia.ed ma.eria.s.

关键词： Tungsten Molecula. dyna.ics method Disloca.ions Voids Bounda.y conditions

Hetero-integra.ed high-pea.-optica.-power la.er source (940 nm) for time-of-flight sensors

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Optics Letters 2024年第7期22卷 81-85页

作者： Sergey Olegovich Slipchenko aleksandr aleksandrovich Podoskin Ilia.Va.il'evich Shushka.ov Ma.ina.Genna.'evna.Ra.tega.va.a.tem Edua.dovich Riza.v Ma.vey Igorevich Kondra.ov a.tem Evgen'evich Grishin Nikita.aleksandrovich Pikhtin Timur a.a.ol'evich Ba.a.v Ma.im a.a.ol'evich La.ugin aleksandr a.a.ol'evich Ma.ma.yuk Vla.imir aleksandrovich Sima.ov Ioffe Institut Russian Academy of SciencesSt.Petersburg 194021Russia Open Joint-Stock Compa.y M.F.Stel’ma.h Polyus Resea.ch Institute Moscow 117342Russia RUDN University Moscow 117198Russia

The genera.ion of high-power la.er pulses using a.compa.t hetero-integra.ed a.sembly ba.ed on a.semiconductor la.er with a.dua.-element composite 2μm×100μm a.erture a.d a.compa.t heterothyristor switch is *** a.hieved pea. optica. power wa. 33 W with a.pulse dura.ion of 3 ns a. a.thyristor opera.ing volta.e of 55 *** lea.ing edge of the la.er pulse turn-on wa. 50 ps to a.power level of 24.7 W,a.d the turn-on dela. between the elements of the composite a.erture wa. 160 ps.

关键词： hetero-integra.ed a.sembly semiconductor la.ers thyristor switches LIDa. ga.n-switching mode la.er heterostructure