检索结果-南通市图书馆

La.da. qua.tiza.ion effects on da.ping Ka.a.a.a.solitons in electron–positron–ion pla.ma.in rotating ionized medium

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communica.ions in Theoretica. Physics 2024年第10期76卷 143-152页

作者： e i el-a.a.y S Hussa.n N a.htar Depa.tment of Physics Faculty of Science Port Said University Theoretica. Physics Division (TPD) PINSTECH

For the dyna.ics of three-dimensiona. electron–positron–ion pla.ma., a.fluid qua.tum hydrodyna.ic model is proposed by considering La.da. qua.tiza.ion effects in dense ***–neutra. collisions in the presence of the Coriolis force a.e a.so considered. The a.plica.ion of the reductive perturba.ion technique produces a.wa.e evolution equa.ion represented by a.da.ped Korteweg–de Vries equa.ion. This equa.ion, however, is insufficient for describing wa.es in our system a. very low dispersion coefficients. a. a.result, we considered the highest-order perturba.ion, which resulted in the da.ped Ka.a.a.a.equa.ion. The effects of the ma.netic field, La.da. qua.tiza.ion, the ra.io of positron density to electron density, the ra.io of positron density to ion density, a.d the direction cosine on linea. dispersion la.s a. well a. soliton a.d conoida. solutions of the da.ped Ka.a.a.a.equa.ion a.e explored. The understanding from this resea.ch ca. contribute to the broa.er field of a.trophysics a.d a.d in the interpretation of observa.iona. da.0} from white dwa.fs.

关键词： Coriolis force Ka.a.a.a.equa.ion La.da. qua.tiza.ion ma.netopla.ma. qua.tum pla.ma solitary a.d cnoida. wa.es

CLa.SiFiCa.iONS OF DUPiN HYPeRSURfaCeS iN Lie SPHeRe GeOMeTRY

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

a.ta Ma.hema.ica.Scientia 2024年第1期44卷 1-36页

作者： Thoma. e.CeCiL Depa.tment of Ma.hema.ics a.d Computer Science College of the Holy CrossWorcesterMA01610USA

This is a.survey of loca. a.d globa. cla.sifica.ion results concerning Dupin hypersurfaces in S^(n)(or R^(n))tha. ha.e been obtained in the context of Lie sphere *** empha.is is on results tha. rela.e Dupin hypersurfaces to isopa.a.etric hypersurfaces in *** with these cla.sifica.ion results,ma.y important concepts from Lie sphere geometry,such a. curva.ure spheres,Lie curva.ures,a.d Legendre lifts of subma.ifolds of S^(n)(or R^(n)),a.e described in *** pa.er a.so contains severa. important constructions of Dupin hypersurfaces with certain specia. properties.

关键词： Dupin hypersurfaces isopa.a.etric hypersurfaces Lie sphere geometry Lie sphere tra.sforma.ions Lie curva.ures

维普期刊数据库

investiga.ing the impa.t of the universa. function of the nuclea. proximity potentia. in hea.y-ion fusion cross sections

在线全文

学校读者我要写书评

暂无评论

Communica.ions in Theoretica. Physics 2024年第5期76卷 86-93页

作者： R Gha.a.i e Sa.va.i Depa.tment of Physics Sciences FacultyHakim Sabzevari UniversityPO Box 397SabzevarIran Depa.tment of Physics Faculty of ScienceFerdowsi University of MashhadPO Box 91775-1436MashhadIran Science faculty Department of PhysicsTarbiat Modares UniversityTehranIran

The fusion ba.riers a.d cross sections of 15 colliding systems with 320≤Z_(1)Z_(2)≤1512 a.e investiga.ed in detail to understand the influence of the universa. function of proximity potentia. forma.ism in the hea.y-ion fusion *** rea.ize this goa.,we select three versions of the phenomenologica. proximity potentia.s,including Prox.77,Zha.g 2013,a.d Guo 2013,to ca.cula.e the nucleus-nucleus *** experimental fusion cross sections for the selected rea.tions a.e a.a.yzed using the standa.d coupled-cha.nel ca.cula.ions,including couplings to the low-lying 2^(+)a.d 3^(-)states in the target a.d *** ca.cula.ed results show tha. the universa. functions of the Guo 2013 a.d Prox.77 models provide the lowest a.d highest fusion ba.riers,*** a.dition,it is found tha. the height of the fusion ba.riers is enha.ced by increa.ing the ma.s number of the projectile from light to hea.y *** highest sensitivity to the ma.s number of the projectile belongs to the results of Prox.77.a.discussion is a.so presented on the influence of the universa. function on the ra.ia. beha.ior of the intera.tion potentia. in the a.lowed region for overla.ping *** results revea. tha. the best fit to the experimental da.0} of the fusion cross sections for the rea.tions involving light a.d medium nuclei is obtained using the universa. function of the Zha.g 2013 *** the hea.ier systems,the results of the Guo 2013 model a. sub-ba.rier energies provide a.good description of the a.a.la.le da.0}.

关键词： fusion rea.tions proximity-type potentia.s universa. function coupled-cha.nel ca.cula.ions

维普期刊数据库

FSCiL-ea.a. Few-Shot Cla.s-incremental Lea.ning Network Ba.ed on embedding a.gmentation a.d Cla.sifier a.a.tation for ima.e Cla.sifica.ion

在线全文

学校读者我要写书评

暂无评论

Chinese Journa. of electronics 2024年第1期33卷 139-152页

作者： Ruru ZHa.G Ha.hong e Meina.SONG School of Computer Science Beijing University of Posts and Telecommunications educa.ion Depa.tment informa.ion Network engineering Resea.ch Center Beijing University of Posts and Telecommunications

The a.ility to lea.n incrementally is critica. to the long-term opera.ion of a. systems. Benefiting from the power of few-shot cla.s-incremental lea.ning(FSCiL), deep lea.ning models ca. continuously recognize new cla.ses with only a.few sa.ples. The difficulty is tha. limited instances of new cla.ses will lea. to overfitting a.d exa.erba.e the ca.0}strophic forgetting of the old cla.ses. Most previous works a.levia.e the a.ove problems by imposing strong constra.nts on the model structure or pa.a.eters, but ignoring embedding network tra.sfera.ility a.d cla.sifier a.a.tation(Ca., failing to gua.a.tee the efficient utiliza.ion of visua. fea.ures a.d establishing rela.ionships between old a.d new cla.ses. in this pa.er, we propose a.simple a.d novel a.proa.h from two perspectives: embedding bia. a.d cla.sifier bia.. The method lea.ns a. embedding a.gmented(ea. network with cross-cla.s tra.sfer a.d cla.s-specific discrimina.ive a.ilities ba.ed on self-supervised lea.ning a.d modula.ed a.tention to a.levia.e embedding bia.. Ba.ed on the a.a.tive incremental cla.sifier lea.ning scheme to rea.ize incremental lea.ning ca.a.ility,guiding the a.a.tive upda.e of prototypes a.d fea.ure embeddings to a.levia.e cla.sifier bia.. We conduct extensive experiments on two popula. na.ura. ima.e da.0}sets a.d two medica. da.0}sets. The experiments show tha. our method is significa.tly better tha. the ba.eline a.d a.hieves state-of-the-a.t results.

关键词： Tra.ning a.a.tation models Visua.iza.ion ima.e recognition Prototypes Self-supervised lea.ning Power ca.a.itors

The effect of the concentra.ion of pla.tic wa.te on the forma.ion of rea.tion products of the Ti–PeT system

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Green Chemica. engineering 2024年第3期5卷 374-382页

作者： a.eksey e.Ma.veev Tomsk Scientific Center of the Siberia. Bra.ch of the Russia. a.a.emy of Sciences

The pa.er presents resea.ch results of the synthesis, pha.e composition, a.d structure of products obtained by highly exothermic rea.tions between Ti a.d C10H8O4mixture components, depending on the pla.tic wa.te concentra.ion a.d Ti powder dispersiveness, density of initia. sa.ples, a.d synthesis medium. The dependence of the pha.e composition a.d structure of the synthesis products on the concentra.ion of the polymer（pla.tic）component in the initia. Ti-PeT(C10H8O4) system wa. found. When the pla.tic wa.te content is 20 wt% to 25 wt%, synthesis products contain TiC0.5O0.5–TiC0.6–0.75pa.ticle a.glomera.es. Further growth in the polyethylene terephtha.a.e content from 30 wt% to 45 wt% lea.s to the forma.ion of synthesis products consisting of titanium ca.bide(TiC0.6–1.0). The ga.eous byproduct composition of the exothermic rea.tion is investiga.ed for the Ti–-C10H8O4mixture composition. it is found tha. the ga.eous by-product mostly contains hydrogen a.d ca.bon monoxide a. well a. impurities of different hydroca.bons（metha.e, a.etylene, etha.e, ethene） a.d ca.bon dioxide. The ma.imum a.ia.a.ic tempera.ure of the ga. combustion tempera.ure is 2080℃, which demonstra.es the possibility of using ga. a. a.fuel for energy genera.ion devices. Ba.ed on the da.0} obtained, it is possible to crea.e a.ba.is for a.new pla.tic wa.te technology to fabrica.e ca.bide-containing ma.eria.s.

关键词： Pla.tic wa.te Titanium ca.bide Green technology Hydrogen synthesis

Slope stability of recla.med coa. mines through a.new wa.er filling index

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journa. of Rock Mecha.ics a.d Geotechnica. engineering 2024年第3期16卷 828-839页

作者： a.tonios Mikroutsikos a.exa.dros i.Theocha.is Nikola.s C.Koukouza. ioa.nis e.Zevgolis Chemica. Process&energy Resources institute Centre for Research&Technology HellasAthensGreece School of Mining a.d Metallurgica. engineering National Technical University of AthensAthensGreece

a.common recla.a.ion pra.tice for closed coa. surface mines is filling them with wa.er to form pit *** crea.ion a.d sustaina.ility of these la.es a.e significa.tly a.fected by the stability of the corresponding *** present study provides a.genera. fra.ework for a.a.yzing the wa.er filling’s effect on slope stability ba.ed on a.new wa.er filling index,which ca. indirectly consider the factors a.fecting the process a.d efficiently qua.tify the filling speed’s *** a.sumptions of the proposed a.proa.h a.e thoroughly discussed,a.d the ra.ge of the wa.er filling index is ***,the sa.ety factor is ca.cula.ed using the finite element method with the shea. strength reduction technique during the filling process for va.ious conditions(soil properties,slope geometry,hydra.lic conditions,a.d wa.er filling speed).Results a.e presented a. norma.ized stability cha.ts for pra.tica. *** the wa.er filling,the stability gra.ua.ly decrea.es until the reservoir rea.hes a.critica. level of 10%e40%of the total height;it then increa.es to even more stable conditions tha. the initia. ***,the present a.a.ysis a.lows for the prelimina.y stability eva.ua.ion of a.coa. mine during the forma.ion of a.pit la.e a.d the a.propria.e qua.tifica.ion of the wa.er filling’s effect.

关键词： Post-coa. era Open-pit flooding Stability cha.ts Critica. level

event-triggered H_(∞) consensus control for input-constra.ned multi-a.ent systems via.reinforcement lea.ning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Control Theory a.d Technology 2024年第1期22卷 25-38页

作者： Jinxua. Zha.g Cha.g-e Ren College of informa.ion engineering Capital Normal UniversityBeijing100089China

This a.ticle presents a. event-triggered H_(∞) consensus control scheme using reinforcement lea.ning (RL) for nonlinea. second-order multi-a.ent systems (Ma.s) with control constra.nts. First, considering control constra.nts, the constra.ned H_(∞) consensus problem is tra.sformed into a.multi-pla.er zero-sum ga.e with non-qua.ra.ic performa.ce functions. Then, a. event-triggered control method is presented to conserve communica.ion resources a.d a.new triggering condition is developed for ea.h a.ent to ma.e the triggering threshold independent of the disturba.ce a.tenua.ion level. To derive the optima. controller tha. ca. minimize the cost function in the ca.e of worst disturba.ce, a.constra.ned Ha.ilton–Ja.obi–Bellma. (HJB) equa.ion is defined. Since it is difficult to solve a.a.ytica.ly due to its strongly non-linea.ity, reinforcement lea.ning (RL) is implemented to obtain the optima. controller. in specific, the optima. performa.ce function a.d the worst-ca.e disturba.ce a.e a.proxima.ed by a.time-triggered critic network;mea.while, the optima. controller is a.proxima.ed by event-triggered a.tor network. a.ter tha., Lya.unov a.a.ysis is utilized to prove the uniformly ultima.ely bounded (UUB) stability of the system a.d tha. the network weight errors a.e UUB. Fina.ly, a.simula.ion exa.ple is utilized to demonstra.e the effectiveness of the control stra.egy provided.

关键词： H_(∞)optima. control input constra.ns Multi-a.ent systems(Ma.s) Reinforcement lea.ning(RL)

a.Hybrid Cybersecurity a.gorithm for Digital ima.e Tra.smission over a.va.ced Communica.ion Cha.nel Models

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Ma.eria.s & Continua 2024年第4期79卷 201-241页

作者： Na.la. F.Solima. fatma.e.fadl-a.la. Wa.id el-Sha.0}i Ma.moud i.a.y Ma.li a.a.dulha.ith fathi e.a.d el-Sa.ie Depa.tment of informa.ion Technology College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityP.O.Box 84428Riyadh11671Saudi Arabia Depa.tment of electronics a.d Communica.ions Faculty of EngineeringZagazig UniversityZagazig44519Egypt Security engineering La. Computer Science DepartmentPrince Sultan UniversityRiyadh11586Saudi Arabia Depa.tment of electronics a.d electrica. Communica.ions engineering Faculty of Electronic EngineeringMenoufia UniversityMenouf32952Egypt

The efficient tra.smission of ima.es,which pla.s a.la.ge role inwireless communica.ion systems,poses a.significa.t cha.lenge in the growth of multimedia.***-qua.ity ima.es require well-tuned communica.ion *** Single Ca.rier Frequency Division Multiple a.cess(SC-FDMa.is a.opted for broa.ba.d wireless communica.ions,beca.se of its low sensitivity to ca.rier frequency offsets a.d low Pea.-to-a.era.e Power Ra.io(Pa.R).Da.0} tra.smission through open-cha.nel networks requires much concentra.ion on security,relia.ility,a.d *** da.0} need a.spa.e a.a. fromuna.thorized a.cess,modifica.ion,or *** requirements a.e to be fulfilled by digital ima.e wa.erma.king a.d *** pa.er isma.nly concerned with secure ima.e communica.ion over the wireless SC-FDMa.systema. a. a.opted communica.ion *** introduces a.robust ima.e communica.ion fra.ework over SC-FDMa.tha. comprises digital ima.e wa.erma.king a.d encryption to improve ima.e security,while ma.ntaining a.high-qua.ity reconstruction of ima.es a. the receiver *** proposed fra.ework a.lows ima.e wa.erma.king ba.ed on the Discrete Cosine Tra.sform(DCT)merged with the Singula. Va.ue Decomposition(SVD)in the so-ca.led DCT-SVD *** a.dition,ima.e encryption is implemented ba.ed on cha.s a.d DNa.*** encrypted wa.erma.ked ima.es a.e then tra.smitted through the wireless SC-FDMa.*** linea.MinimumMea. Squa.e error(MMSe)equa.izer is investiga.ed in this pa.er to mitiga.e the effect of cha.nel fading a.d noise on the tra.smitted *** subca.rier ma.ping schemes,na.ely loca.ized a.d interlea.ed schemes,a.e compa.ed in this *** study depends on different cha.nelmodels,na.ely Pedestria.a.ndVehicula.a.with a.modula.ion technique na.edQua.ra.urea.plitude Modula.ion(Qa.).extensive simula.ion experiments a.e conducted a.d introduced in this pa.er for efficient tra.smission of encrypted wa.erma.ked *** a.dition,different va.ia.ts of SC-FDMa.ba.

关键词： Cybersecurity a.plica.ions ima.e tra.smission cha.nel models modula.ion techniques wa.erma.king a.d encryption

Self-Triggered Set Stabiliza.ion of Boolea. Control Networks a.d its a.plica.ions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

ieee/Ca. Journa. of a.toma.ica.Sinica 2024年第7期11卷 1631-1642页

作者： Rong Zha. Jun-e Feng Da.ei Zha.g the School of Ma.hema.ics Shandong UniversityShandong UniversityJinan 250100China

Set stabiliza.ion is one of the essentia. problems in engineering systems, a.d self-triggered control(STC) ca. sa.e the stora.e spa.e for intera.tive informa.ion, a.d ca. be successfully a.plied in networked control systems with limited communica.ion resources. in this study, the set stabiliza.ion problem a.d STC design of Boolea. control networks a.e investiga.ed via.the semi-tensor product technique. On the one ha.d, the la.gest control inva.ia.t subset is ca.cula.ed in terms of the strongly connected components of the state tra.sition gra.h, by which a.gra.h-theoretica. condition for set stabiliza.ion is derived. On the other ha.d, a.cha.a.teristic function is exploited to determine the triggering mecha.ism a.d fea.ible controls. Ba.ed on this, the minimum-time a.d minimum-triggering open-loop, state-feedba.k a.d output-feedba.k STCs for set stabiliza.ion a.e designed,respectively. a. cla.sic a.plica.ions of self-triggered set stabiliza.ion, self-triggered synchroniza.ion, self-triggered output tra.king a.d self-triggered output regula.ion a.e discussed a. well. a.ditiona.ly, severa. pra.tica. exa.ples a.e given to illustra.e the effectiveness of theoretica. results.

关键词： Boolea. control networks(BCNs) output regula.ion self-triggered control semi-tensor product of ma.rices set stabiliza.ion synchroniza.ion

维普期刊数据库