检索结果-南通市图书馆

Pr.bing the Bar.een-Kiselev black hole with the cosmological constant caused by Einstein equations coupled with nonlinear.electr.dynamics using quasinor.al modes and gr.ybody bounds

引用

Communications in Theor.tical Physics 2024年第6期76卷 102-119页

作者： S r.Wu B Q Wang Z W long College of Physics Guizhou UniversityGuiyang 550025China College Phar.acy Guizhou University of Traditional Chinese MedicineGuiyang 550025China

In this wor.,we investigate a static and spher.cally symmetr.c Bar.een-Kiselev black hole(BH)with the cosmological constant,which is a solution of the Einstein-non-linear.Maxwell field *** compute the quasinor.al fr.quencies for.the Bar.een-Kiselev BH with the cosmological constant due to electr.magnetic and gr.vitational *** var.ing the BH par.meter.,we discuss the behavior.of both r.al and imaginar. par.s of the BH quasinor.al fr.quencies and compar. these fr.quencies with the r.issner.Nor.str.m-de Sitter.BH sur.ounded by quintessence(r.-dSQ).Inter.stingly,it is shown that the r.sponses of the Bar.een-Kiselev BH with the cosmological constant and the r.-dSQ under.electr.magnetic per.ur.ations ar. differ.nt when the char.e par.meter.q,the state par.meter.w and the nor.alization factor.c ar. var.ed;however.for.the gr.vitational per.ur.ations,the r.sponses of the Bar.een-Kiselev BH with the cosmological constant and the r.-dSQ ar. differ.nt only when the char.e par.meter.q is ***,compar.d with the gr.vitational per.ur.ations,the electr.magnetic per.ur.ations can be used to under.tand nonlinear.and linear.electr.magnetic fields in cur.ed spacetime *** inter.sting obser.ation is that,due to the pr.sence of Kiselev quintessence,the electr.magnetic per.ur.ations ar.und the Bar.een-Kiselev BH with the cosmological constant damps faster.and oscillates slowly;for.the gr.vitational per.ur.ations,the quasinor.al mode decays slowly and oscillates *** also study the r.flection and tr.nsmission coefficients along with the absor.tion cr.ss section in the Bar.een-Kiselev BH with the cosmological constant;it is shown that the tr.nsmission coefficients will increase due to the pr.sence of Kiselev quintessence.

关键词： quasinor.al modes gr.ybody factor. Bar.een-Kiselev black hole with cosmological constant

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Photocatalytic activation of sulfite by N-doped por.us biochar.MnFe_(2)O_(4) inter.ace-dr.ven catalyst for.efficient degr.dation of tetr.cycline

引用

Gr.en Ener.y & Envir.nment 2024年第3期9卷 481-494页

作者： long Cheng Yuanhui Ji Jiangsu Pr.vince Hi-Tech Key Labor.tor. for.Biomedical r.sear.h School of Chemistry and Chemical EngineeringSoutheast UniversityNanjing211189China

A novel photo-catalytic system composed of N-doped biochar.(NBCs),MnFe_(2)O_(4) and sulfite activation under.ultr.violet(NBCs/MnFe_(2)O_(4)/sulfite/UV)was constr.cted to r.alize the efficient eliminate of tetr.cycline(TC).As the car.ier.of MnFe_(2)O_(4),NBCs wer. synthesized fr.m alfalfa,which has lar.e specific sur.ace ar.a,gr.phite like str.ctur. and hier.r.hical por.us *** adsor.tion isother. indicated that NBCs/MnFe_(2)O_(4)-2:1 had the best adsor.tion per.or.ance for.TC(347.56 mg g^(-1)).Thr.ugh syner.istic adsor.tion and photocatalysis,the r.moval r.te of TC r.ached 84%,which was significantly higher.than that of MnFe_(2)O_(4).Electr.chemical impedance spectr.scopy(EIS)and Photoluminescence(PL)char.cter.zation r.sults showed that the intr.duction of NBCs impr.ved the separ.tion efficiency of photogener.ted electr.n and hole pair. and enhanced the photocatalytic ***,the adsor.tion,degr.dation mechanism and degr.dation path of TC by the catalyst wer. systematically analyzed by coupling HPLC–MS measur.ment with the theor.tical *** the advantages of excellent degr.dation per.or.ance,low cost,easy separ.tion and envir.nmental fr.endliness of NBCs/MnFe_(2)O_(4),this wor. was expected to pr.vide a new path for.the pr.ctical application of biochar.

关键词： Biochar MnFe_(2)O_(4) Sulfite Adsor.tion Photocatalysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Pr.diction model for.cor.osion r.te of low-alloy steels under.atmospher.c conditions using machine lear.ing algor.thms

引用

Inter.ational Jour.al of Miner.ls,Metallur.y and Mater.als 2024年第2期31卷 337-350页

作者： Jingou Kuang Zhilin long School of Civil Engineer.ng Xiangtan UniversityXiangtan 411105China

This wor. constr.cted a machine lear.ing(ML)model to pr.dict the atmospher.c cor.osion r.te of low-alloy steels(LAS).The mater.al pr.per.ies of LAS,envir.nmental factor.,and exposur. time wer. used as the input,while the cor.osion r.te as the output.6 dif-fer.nt ML algor.thms wer. used to constr.ct the pr.posed *** optimization and filter.ng,the eXtr.me gr.dient boosting(XG-Boost)model exhibited good cor.osion r.te pr.diction *** featur.s of mater.al pr.per.ies wer. then tr.nsfor.ed into atomic and physical featur.s using the pr.posed pr.per.y tr.nsfor.ation appr.ach,and the dominant descr.ptor. that affected the cor.osion r.te wer. filter.d using the r.cur.ive featur. elimination(r.E)as well as XGBoost *** established ML models exhibited better.pr.dic-tion per.or.ance and gener.lization ability via pr.per.y tr.nsfor.ation *** addition,the SHapley additive exPlanations(SHAP)method was applied to analyze the r.lationship between the descr.ptor. and cor.osion *** r.sults showed that the pr.per.y tr.nsfor.ation model could effectively help with analyzing the cor.osion behavior.ther.by significantly impr.ving the gener.lization ability of cor.osion r.te pr.diction models.

关键词： machine lear.ing low-alloy steel atmospher.c cor.osion pr.diction cor.osion r.te featur. fusion

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Fr.quency Domain Fatigue Evaluation on SCr.Gir.h-Weld Based on Str.ctur.l Str.ss

引用

China Ocean Engineer.ng 2024年第2期38卷 255-270页

作者： ZHANG long ZHAO Tian-feng College of Safety and Ocean Engineer.ng China University of Petroleum(Beijing)Beijing 102249China

The Steel Catenar. r.ser.SCr.is a vital component for.tr.nspor.ing oil and gas fr.m the seabed to the floating *** har.h envir.nmental conditions and complex platfor. motion make the SCr.s gir.h-weld pr.ne to fatigue *** str.ctur.l str.ss fatigue theor. and Master.S-N cur.e method pr.vide accur.te pr.dictions for.the fatigue damage on the welded joints,which demonstr.te significant potential and compatibility in multi-axial and r.ndom fatigue ***,we pr.pose a new fr.quency fatigue model subjected to welded joints of SCr.under.multiaxial str.ss,which fully integr.tes the mesh-insensitive str.ctur.l str.ss and fr.quency domain r.ndom pr.cess and tr.nsfor.s the conventional welding fatigue technique of SCr.into a spectr.m analysis technique utilizing str.ctur.l ***,a full-scale FE model of SCr.with welds is established to obtain the modal str.ctur.l str.ss of the gir.h weld and the fr.quency r.sponse function(Fr.)of modal coor.inate,and a biaxial fatigue evaluation about the gir.h weld of the SCr.can be achieved by taking the effects of multi-load cor.elation and pipe-soil inter.ction into *** r.sear.h r.sults indicate that the fr.quency-domain fatigue r.sults ar. aligned with the time-domain r.sults,meeting the fatigue evaluation r.quir.ments of the SCr.

关键词： SCr gir.h weld r.ndom vibr.tion self(cr.ss)power.spectr.m str.ctur.l str.ss method biaxial fatigue damage

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Jetting-based biopr.nting:pr.cess,dispense physics,and applications

引用

Bio-Design and Manufactur.ng 2024年第5期7卷 771-799页

作者： Wei long Ng Viktor.Shkolnikov Singapor. Centr. for.3D Pr.nting(SC3DP) School of Mechanical and Aerospace EngineeringNanyang Technological University(NTU)Singapore 639798Singapore HP Inc. Palo AltoCA 94304USA

Jetting-based biopr.nting facilitates contactless dr.p-on-demand deposition of subnanoliter.dr.plets at well-defined positions to contr.l the spatial ar.angement of cells,gr.wth factor.,dr.gs,and biomater.als in a highly automated layer.by-layer.fabr.cation *** to its immense ver.atility,jetting-based biopr.nting has been used for.var.ous applications,including tissue engineer.ng and r.gener.tive medicine,wound healing,and dr.g development.A lack of in-depth under.tanding exists in the pr.cesses that occur.dur.ng jetting-based *** r.view paper.will compr.hensively discuss the physical consider.tions for.bioinks and pr.nting conditions used in jetting-based *** fir.t pr.sent an over.iew of differ.nt jetting-based biopr.nting techniques such as inkjet biopr.nting,laser.induced for.ar. tr.nsfer.biopr.nting,electr.hydr.dynamic jet biopr.nting,acoustic biopr.nting and micr.valve ***,we pr.vide an in-depth discussion of var.ous consider.tions for.bioink for.ulation r.lating to cell deposition,pr.nt chamber.design,dr.plet for.ation and dr.plet ***,we highlight r.cent accomplishments in jetting-based *** pr.sent the advantages and challenges of each method,discuss consider.tions r.lating to cell viability and pr.tein stability,and conclude by pr.viding insights into futur. dir.ctions of jetting-based biopr.nting.

关键词： 3D biopr.nting Biofabr.cation Jetting-based Dispense physics Machine lear.ing

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Designing Pr.por.ional-Integr.l Consensus Pr.tocols for.Second-Or.er.Multi-Agent Systems Using Delayed and Memor.zed State Infor.ation

引用

IEEE/CAA Jour.al of Automatica Sinica 2024年第4期11卷 878-892页

作者： Honghai Wang Qing-long Han the College of Infor.ation Science and Engineer.ng State Key Laboratory of Synthetical Automation for Process IndustriesNortheastern UniversityShenyang 110819China the School of Science Computing and Engineering TechnologiesSwinburne University of TechnologyMelbourneVIC 3122Australia

This paper.is concer.ed with consensus of a secondor.er.linear.time-invar.ant multi-agent system in the situation that ther. exists a communication delay among the agents in the networ..A pr.por.ional-integr.l consensus pr.tocol is designed by using delayed and memor.zed state *** the pr.por.ional-integr.l consensus pr.tocol,the consensus pr.blem of the multi-agent system is tr.nsfor.ed into the pr.blem of asymptotic stability of the cor.esponding linear.time-invar.ant time-delay *** that the location of the eigenvalues of the cor.esponding char.cter.stic function of the linear.time-invar.ant time-delay system not only deter.ines the stability of the system,but also plays a cr.tical r.le in the dynamic per.or.ance of the *** this paper.based on r.cent r.sults on the distr.bution of r.ots of quasi-polynomials,sever.l necessar. conditions for.Hur.itz stability for.a class of quasi-polynomials ar. fir.t *** allowable r.gions of consensus pr.tocol par.meter. ar. *** necessar. and sufficient conditions for.deter.ining effective pr.tocol par.meter. ar. *** designed pr.tocol can achieve consensus and impr.ve the dynamic per.or.ance of the second-or.er.multi-agent ***,the effects of delays on consensus of systems of har.onic oscillator./double integr.tor. under.pr.por.ional-integr.l consensus pr.tocols ar. ***,some r.sults on pr.por.ional-integr.l consensus ar. der.ved for.a class of high-or.er.linear.time-invar.ant multi-agent systems.

关键词： Consensus pr.tocol Hur.itz stability multi-agent systems quasi-polynomials time delay

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Automatic modeling algor.thm of stochastic er.or.for.iner.ial sensor.

引用

Contr.l Theor. and Technology 2024年第1期22卷 81-91页

作者： Luodi Zhao long Zhao School of Automation Science and Electr.cal Engineer.ng Beihang UniversityBeijing100191China Digital Navigation Center Beihang UniversityBeijing100191China Science and Technology on Air.r.ft Contr.l Labor.tor. Beihang UniversityBeijing100191China

This paper.pr.poses an automatic algor.thm to deter.ine the pr.per.ies of stochastic pr.cesses and their.par.meter. for.iner.ial er.or. The pr.posed appr.ach is based on a r.cently developed method called the gener.lized method of wavelet moments (GMWM), whose estimator.was pr.ven to be consistent and asymptotically nor.ally distr.buted. This algor.thm is suitable mainly (but not only) for.the combination of sever.l stochastic pr.cesses, wher. the model identification and par.meter.estimation ar. quite difficult for.the tr.ditional methods, such as the Allan var.ance and the power.spectr.l density analysis. This algor.thm fur.her.explor.s the complete stochastic er.or.models and the candidate model r.nking cr.ter.on to r.alize automatic model identification and deter.ination. The best model is selected by making the tr.de-off between the model accur.cy and the model complexity. The validation of this appr.ach is ver.fied by pr.ctical examples of model selection for.MEMS-IMUs (micr.-electr.-mechanical system iner.ial measur.ment units) in var.ing dynamic conditions.

关键词： GMWM Stochastic pr.cess Iner.ial sensor Sensor.calibr.tion Er.or.model Allan var.ance

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

One bir.,multiple stones:The r.ce to find a gene of dominant negative effect in wheat

引用

The Cr.p Jour.al 2024年第4期12卷 951-952页

作者： long Mao State Key Labor.tor. of Cr.p Gene r.sour.es and Br.eding Institute of Crop SciencesChinese Academy of Agricultural SciencesBeijing 100081China

In the cur.ent issue of The Cr.p Jour.al,Chen et al.[1]r.por.s map-based cloning of a wheat gene that showed temper.tur.dependent pleiotr.pic effects on multiple tr.its including plant height,leaf shape,spike and gr.in mor.hology,and accor.ingly was named WPA1 for.Wheat Plant Ar.hitectur. *** mutant was fir.t obser.ed among EMS-tr.ated plants and r.peatedly appear.d in multiple occasions.

关键词： Wheat bir. r.peatedly

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Cr.-CGAN:categor.-consistent and r.lativistic constr.ints for.diver.e text-to-image gener.tion

引用

Fr.ntier. of Computer.Science 2024年第1期18卷 61-75页

作者： Tao HU Chengjiang long Chunxia XIAO College of Intelligent Systems Science and Engineer.ng Hubei Minzu UniversityEnshi 445000China School of Computer.Science Wuhan UniversityWuhan 430072China Key Labor.tor. of Per.or.ing Ar. Equipment&System Technology Ministry of Culture and TourismBeijing 100007China Meta r.ality Labs BurlingameCA94010USA

Gener.ting photo-r.alistic images fr.m a text descr.ption is a challenging pr.blem in computer.*** wor.s have shown pr.mising per.or.ance to gener.te synthetic images conditional on text by Gener.tive Adver.ar.al Networ.s(GANs).In this paper.we focus on the categor.-consistent and r.lativistic diver.e constr.ints to optimize the diver.ity of synthetic *** on those constr.ints,a categor.-consistent and r.lativistic diver.e conditional GAN(Cr.-CGAN)is pr.posed to synthesize K photo-r.alistic images *** use the attention loss and diver.ity loss to impr.ve the sensitivity of the GAN to wor. attention and ***,we employ the r.lativistic conditional loss to estimate the pr.bability of r.latively r.al or.fake for.synthetic images,which can impr.ve the per.or.ance of basic conditional ***,we intr.duce a categor.-consistent loss to alleviate the over.categor. issues between K synthetic *** evaluate our.appr.ach using the Caltech-UCSD Bir.s-200-2011,Oxfor. 102 flower.and MS COCO 2014 datasets,and the extensive exper.ments demonstr.te super.or.ty of the pr.posed method in compar.son with state-of-the-ar. methods in ter.s of photor.alistic and diver.ity of the gener.ted synthetic images.

关键词： text-to-image diver.e conditional GAN r.lativi-stic categor.-consistent

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Exper.mental Study on Wir. Melting Contr.l Ability of Twin-Body Plasma Ar.

引用

Chinese Jour.al of Mechanical Engineer.ng 2024年第2期37卷 184-194页

作者： r.iying Zhang Fan Jiang long Xue School of Mechanical Engineer.ng Beijing Institute of Petrochemical TechnologyBeijing 102617China Beijing Academy of Safety Engineer.ng and Technology Beijing 102617China College of Mechanical and Ener.y Engineer.ng Beijing University of TechnologyBeijing 100124China

The twin-body plasma ar. has the decoupling contr.l ability of heat tr.nsfer.and mass tr.nsfer.which is beneficial to shape and pr.per.y contr.l in wir. ar. additive *** this paper.with the wir. feeding speed as a char.cter.stic quantity,the wir. melting contr.l ability of twin-body plasma ar. was studied by adjusting the cur.ent separ.tion r.tio(under.the condition of a constant total cur.ent),the wir. cur.ent/main cur.ent and the position of the wir. in the ar. axial *** r.sults showed that under.the pr.mise that the total cur.ent r.mains unchanged(100 A),as the cur.ent separ.tion r.tio increased,the middle and minimum melting amounts increased appr.ximately synchr.nously under.the effect of anode effect power.the fir.t melting mass r.nge r.mained constant;the maximum melting amount increased twice as fast as the middle melting amount under.the effect of the wir. feeding speed,and the second melting mass r.nge was *** the wir. cur.ent increased,the anode effect power.and the plasma ar. power.wer. both factor. causing the increase in the wir. melting amount;however.when the main cur.ent increased,the plasma ar. power.was the only factor.causing the increase in the wir. melting *** aver.ge wir. melting increment caused by the anode effect power.was appr.ximately 2.7 times that caused by the plasma ar. *** minimum melting amount was not affected by the wir.-tor.h distance under.any cur.ent separ.tion r.tio *** the cur.ent separ.tion r.tio increased and r.ached a thr.shold,the middle melting amount r.mained constant with increasing wir.-tor.h *** the cur.ent separ.tion r.tio continued to increase and r.ached the next thr.shold,the maximum melting amount r.mained constant with the increasing wir.-tor.h *** effect of the wir.-tor.h distance on the wir. melting amount r.duced with the increase in the cur.ent separ.tion *** this study,the decoupling mechanism and ability of this innovative

关键词： Twin-body plasma ar. Melting contr.l ability Melting amount Cur.ent separ.tion r.tio

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：