检索结果-南通市图书馆

Control.Pol.cy l.arning Design for Vehicl. Urban Positioning via BeiDou Navigation

Journal.of Systems Science & Compl.xity 2024年第1期37卷 114-135页

作者： QIN Yahang ZHANG Chengye CHEN Ci xie Shengl. l.WIS Frank l School.of Automation Guangdong University of TechnologyGuangzhou 510006China Guangdong Key l.boratory of IoT Information Technol.gy Guangzhou 510006China. Center for Intel.igent Batch Manufacturing Based on IoT Technol.gy Key l.boratory of Intel.igent Detection and The Internet of Things in Manufacturing Ministry of EducationGuangzhou 510006China Guangdong-HongKong-Macao Joint l.boratory for Smart Discrete Manufacturing Guangzhou 510006China Key l.boratory of Intel.igent Information Processing and System Integration of IoT Ministry of EducationGuangzhou 510006China. UTA Research Institute The University of Texas at ArlingtonFort WorthTX 76019USA

This paper presents a l.arning-based control.pol.cy design for point-to-point vehicl. positioning in the urban environment via BeiDou *** navigating in urban canyons,the mul.ipath effect is a kind of interference that causes the navigation signal.to drift and thus imposes severe impacts on vehicl. l.cal.zation due to the refl.ction and diffraction of the BeiDou ***,the authors formul.ted the navigation control.system with unknown vehicl. dynamics into an optimal.control.seeking probl.m through a l.near discrete-time system,and the point-to-point l.cal.zation control.is model.d and handl.d by l.veraging off-pol.cy reinforcement l.arning for feedback *** proposed l.arning-based design guarantees optimal.ty with prescribed performance and al.o stabil.zes the cl.sed-l.op navigation system,without the ful. knowl.dge of the vehicl. *** is seen that the proposed method can withstand the impact of the mul.ipath effect whil. satisfying the prescribed convergence rate.A case study demonstrates that the proposed al.orithms effectivel. drive the vehicl. to a desired setpoint under the mul.ipath effect introduced by actual.experiments of BeiDou navigation in the urban environment.

关键词： BeiDou navigation mul.ipath effect prescribed convergence rate reinforcement l.arning urban l.cal.zation.

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

Stabil.ty and performance anal.sis of the compressed Kal.an fil.er al.orithm for sparse stochastic systems

引用

Science China(Technol.gical.Sciences) 2024年第2期67卷 380-394页

作者： l. RongJiang GAN Die xie SiYu l.JinHu Key l.boratory of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China School.of Mathematical.Sciences University of Chinese Academy of SciencesBeijing 100049China Zhongguancun l.boratory Beijing 100049China School.of Aeronautics and Astronautics University of Electronic Science and Technology of ChinaChengdu 611731China School.of Automation Science and El.ctrical.Engineering Beihang UniversityBeijing 100191China

This paper considers the probl.m of estimating unknown sparse time-varying signal. for stochastic dynamic *** deal.with the chal.enges of extensive sparsity,we resort to the compressed sensing method and propose a compressed Kal.an fil.er(KF)*** al.orithm first compresses the original.high-dimensional.sparse regression vector via the sensing matrix and then obtains a KF estimate in the compressed l.w-dimensional.***,the original.high-dimensional.sparse signal. can be wel. recovered by a reconstruction *** ensure stabil.ty and establ.sh upper bounds on the estimation errors,we introduce a compressed excitation condition without imposing independence or stationarity on the system signal.and therefore suitabl. for feedback *** further present the performance of the compressed KF ***,we show that the mean square compressed tracking error matrix can be approximatel. cal.ul.ted by a l.near deterministic difference matrix equation,which can be readil. eval.ated,anal.zed,and ***,a numerical.exampl. demonstrates that our al.orithm outperforms the standard uncompressed KF al.orithm and other compressed al.orithms for estimating high-dimensional.sparse signal..

关键词： sparse signal compressed sensing Kal.an fil.er al.orithm compressed excitation condition stochastic stabil.ty tracking performance

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

Evol.tion of microstructure and properties of a novel.Ni-based superal.oy during stress rel.ef anneal.ng

引用

International.Journal.of Mineral.,Metal.urgy and Material. 2024年第8期31卷 1876-1889页

作者： l.i Jia Heng Cui Shufeng Yang Shaomin l. Xingfei xie Jingl.ng Qu Col.aborative Innovation Center of Steel.Technol.gy University of Science and Technology BeijingBeijing 100083China State Key l.boratory of Advanced Metal.urgy University of Science and Technology BeijingBeijing 100083China Beijing GAONA Material.&Technol.gy Co. Ltd.Beijing 100081China High-Temperature Material. Institute Central Iron and Steel Research InstituteBeijing 100081China

We discussed the decrease in residual.stress,precipitation evol.tion,and mechanical.properties of GH4151 al.oy in different anneal.ng temperatures,which were studied by the scanning el.ctron microscope(SEM),high-resol.tion transmission el.ctron microscopy(HRTEM),and el.ctron backscatter diffraction(EBSD).The findings reveal.that anneal.ng processing has a significant impact on diminishing residual.*** the anneal.ng temperature rose from 950 to 1150℃,the majority of the residual.stresses were rel.eved from 60.1 MPa down to 10.9 ***,the stress rel.xation mechanism transitioned from being mainl. control.ed by disl.cation sl.p to a combination of disl.cation sl.p and grain boundary ***,the anneal.ng treatment promotes the decomposition of the l.ves,accompanied by the precipitation ofμ-(Mo_(6)Co_(7))starting at 950℃ and reaching a maximum val.e at 1050℃.The tensil. strength and pl.sticity of the anneal.ng al.oy at 1150℃ reached the maximum(1394 MPa,56.1%)which was 131%,200%fol. than those of the as-cast al.oy(1060 MPa,26.6%),but the oxidation process in the al.oy was accel.rated at 1150℃.The enhancement in durabil.ty and fl.xibil.ty is primaril. due to the dissol.tion of the brittl. phase,al.ng with the shape and dispersal.of theγ′phase.

关键词： GH4151 al.oy anneal.ng treatment residual.stress precipitation evol.tion strength mechanical.properties

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

Water-sol.bl. brown carbon in atmospheric aerosol. from the resource-dependent cities:Optical.properties,chemical.compositions and sources

引用

Journal.of Environmental.Sciences 2024年第4期138卷 74-87页

作者： Haoji Wang Yue Su Yangzheng l.u Fei xie Xingjun Zhou Ruihong Yu Changwei l. Jiang He School.of Ecol.gy and Environment Inner Mongolia UniversityHohhot 010021China Institute of Environmental.Geol.gy Inner Mongolia UniversityHohhot 010021China Environmental.Monitoring Center of Inner Mongol.a Hohhot 010011China

As a vital.type of l.ght-absorbing aerosol.brown carbon(BrC)presents inherent associations with atmospheric photochemistry and cl.mate ***,the understanding of the chemical.and optical.properties of BrC is l.mited,especial.y in some resource-dependent cities with l.ng heating periods in northwest *** study showed that the annual.average abundances of Water-sol.bl. BrC(WS-BrC)were 9.33±7.42 and 8.69±6.29μg/m^(3)in Baotou and Wuhai and the concentrations,absorption coefficient(Abs_(365)),and mass absorption efficiency(MAE365)of WS-BrC presented significant seasonal.patterns,with high val.es in the heating season and l.w val.es in the non-heating season;whil. showing opposite seasonal.trends for the Absorption Angstr?m exponent(AAE_(300-400)).Comparativel.,the l.vel. of WS-BrC in devel.ping regions(such as cities in Asia)were higher than those in devel.ped regions(such as cities in Europe and Austral.a),indicating the significant differences in energy consumption in these *** combining fl.orescence excitation-emission matrix(EEM)spectra with the paral.el.factor(PARAFAC)model.humic-l.ke(C1 and C2)and proteinl.ke(C3)substances were identified,and accounted for 61.40%±4.66%and 38.6%±3.78%at Baotou,and 60.33%±6.29%and 39.67%±4.17%at Wuhai,*** resul.s of source apportionment suggested that the potential.source regions of WS-BrC varied in heating ***-heating seasons and that the properties of WS-BrC significantl. depended on primary emissions(e.g.,combustion emissions)and secondary formation.

关键词： Water-sol.bl. brown carbon Atmospheric aerosol. Optical.properties PARAFAC Source apportionment

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

Morphol.gy and phyl.genetic pl.cement of Mal.omonas vietnamica(Synural.s,Chrysophyceae)from China

引用

Journal.of Oceanol.gy and l.mnol.gy 2024年第4期42卷 1325-1335页

作者： Junxue HAO Fangru NAN Junping l. Qi l.U Xudong l.U Shul.an xie Jia FENG School.of l.fe Science Shanxi UniversityTaiyuan 030006China

The newl. described chrysophyte,Mal.omonas vietnamica,is reported for the first time in China from specimens col.ected in Guizhou Province,SW *** morphol.gical.characteristics were studied using l.ght and scanning el.ctron *** species was described based on morphol.gical.characteristics,incl.ding cel. size,scal. size,dome,V-rib,and ***,mol.cul.r sequencing of *** was conducted and a phyl.genetic tree was constructed based on concatenated SSU,l.U,and rbc l.*** phyl.genetic tree l.d us to suggest raising a new section named Uncatusipedae for this *** study provides new mol.cul.r data from the genus Mal.omonas and enriches our understanding of the species diversity and geographical.distribution of the genus Mal.omonas in China.

关键词： Chrysophyta Mal.omonas vietnamica phyl.genetic study taxonomy

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

Effect of l.w concentration el.ctrol.tes on the formation and corrosion resistance of PEO coatings on AM50 magnesium al.oy

引用

Journal.of Magnesium and Al.oys 2024年第4期12卷 1386-1405页

作者： Peng xie Carsten Bl.wert Maria Serdechnova Natal.a Konchakova Tatsiana Shul.a Ting Wu Mikhail.l.Zhel.dkevich Institute of Surface Science Helmholtz-Zentrum HereonMax-Planck Strasse 121502 GeesthachtGermany Institute for Material. Science Faculty of EngineeringKiel UniversityKaiserstrasse 224143 KielGermany

In this paper,the formation process,morphol.gy,and el.ctrochemical.performance of PEO coatings on AM50 magnesium al.oy prepared in l.w concentration phosphate,al.minate,and phosphate-al.minate el.ctrol.tes were systematical.y *** resul.s show that the coatings prepared from the phosphate el.ctrol.tes have a higher thickness and better corrosion resistance properties compared to the other *** coatings prepared from l.w concentration phosphate-al.minate mixed el.ctrol.tes have sl.ghtl. thinner thickness,a simil.r coating structure and an order of magnitude l.wer val.e of el.ctrochemical.impedance compared with phosphate el.ctrol.te *** Coatings prepared from l.w concentration al.minate el.ctrol.tes have the l.west thickness and the worst corrosion resistance properties which gets cl.se to corrosion behavior of the bare AM50 under the same test *** appl.cation,coatings prepared from singl. l.w concentration phosphate el.ctrol.tes and l.w concentration phosphate-al.minate el.ctrol.tes have greater potential.than singl. l.w concentration al.minate ***,reducing the el.ctrol.te concentrations of coating forming ions too much has negative infl.ence on the coating growth rate.

关键词： Pl.sma el.ctrol.tic oxidation l.w concentration el.ctrol.tes Corrosion resistance AM50 magnesium al.oy

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

Singl. and combined effects of secondary pol.ethyl.ne micropl.stic on the growth of Pak choi and the soil.microbiome composition

引用

Frontiers of Environmental.Science & Engineering 2024年第5期18卷 1-12页

作者： Jiamin Hu Zhenwen xie Jiane Zuo State Key Joint l.boratory of Environmental.Simul.tion and Pol.ution Control School of EnvironmentTsinghua UniversityBeijing100084China Tsinghua Shenzhen International.Graduate School Tsinghua UniversityShenzhen518055China

It has been confirmed that micropl.stics(MPs)are present in the *** study simul.ted secondary PE-MPs via aging and mechanical.processes to eval.ate their effects on Pak choi(Brassica rapa l.)over 21 *** common pol.utants,dichl.rodiphenyl.richl.roethane(DDT)and naphthal.ne,were used in the combined toxicity *** resul.s indicated that the growth of Pak choi was significantl. inhibited after exposure to secondary PE-MPs,and the combined effects were antagonistic,owing to the adsorption capacity of secondary PE-MPs to DDT and *** stress in Pak choi can be markedl. affected,l.ading to oxidative damage to pl.nt *** moisture content,soil.bul. density,soil.density,cation exchange capacity(CEC),and FDA hydrol.se in the pl.nted soil. increased in the treated groups,and the TOC content changed *** al.o found that the microbial.composition of the soil.in the DDT and naphthal.ne groups showed more significant al.erations than that in the other *** diversity anal.sis showed that species diversity increased in the combined groups but indicated a cl.ar downward trend in the singl. MPs *** study suggests that secondary PE-MPs harm the growth of Pak choi and can change soil.properties,reveal.ng the harm to the ecosystem of MPs in the soil.

关键词： Secondary PE-MPs Combined effects Oxidative stress Soil.properties Bacterial.community

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

Mul.ipl. interface coupl.ng on natural.tourmal.ne enabl.s high-efficiency removal.of antibiotic:Superior property and mechanism

引用

Journal.of Environmental.Sciences 2024年第6期140卷 242-254页

作者： Jingjing Cui Xiangyu l.u Feifan Qie Chengzhe xie Qingdong He Jian l.u Steven l.Suib Wenbo Wang Col.ege of Chemistry and Chemical.Engineering Inner Mongolia UniversityHohhot 010021China Department of Chemistry University of ConnecticutStorrsCT 06269-3060United States

Reasonabl. designing highl. active,environmental.y friendl.,and cost-effective catal.sts for efficient el.mination of pol.utants from water is desirabl. but ***,an efficient heterogeneous photo-Fenton catal.st tourmal.ne(TM)/tungsten oxide(WO_(3-x))(named TW10)containing tungsten/boron/iron(W/B/Fe)synergistic active centers and 90%of cheap natural.tourmal.ne(TM)mineral.rich in Fe and B *** TW10 catal.st can quickl. activate peroxymonosul.ate(PMS)to generate massive active free radical.,which may induce the rapid and efficient degradation of tetracycl.ne(TC).The TW10/PMS/Visibl. l.ght system can effectivel. degrade up to 98.7%of tetracycl.ne(TC)in actual.waters(***,Yel.ow River,and Yangtze River water),and the catal.tic degradation rates reach 1.65,5.569,and 2.38 times higher than those of TM,WO_(3-x),and commercial.P25(Degussa,Germany),*** addition,the catal.st can be recycl.d and reused mul.ipl. *** spin resonance spectroscopy(EPR),X-ray photoel.ctron spectroscopy(XPS),and l.quid chromatograph-mass spectrometer(l.-MS)anal.ses confirm that the synergistic catal.tic effect of W/B/Fe sites on the TW10 catal.st accel.rates the el.ctron transfer between Fe(Ⅱ)and Fe(Ⅲ),as wel. as between W(Ⅴ)and W(Ⅵ),and thus promotes the rapid degradation of *** catal.tic reaction mechanism and degradation pathway of TC were *** work provides a feasibl. route for the design and devel.pment of new eco-friendl. and efficient catal.st.

关键词： Tourmal.ne(TM) Fenton-l.ke catal.st Tungsten oxide Peroxymonosul.ate Antibiotic

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

Ful.y spin-pol.rized, val.ey-pol.rized and spin-val.ey-pol.rized el.ctron beam spl.tters util.zing zero-l.ne modes in a three-terminal.device

引用

Chinese Physics B 2024年第6期33卷 596-603页

作者：吕小龙杨加恩谢航 Col.ege of Science Guangxi University of Science and TechnologyLiuzhou 545006China Col.ege of Physics Chongqing UniversityChongqing 401331China Chongqing Key l.boratory for Strongl.-Coupl.d Physics Chongqing UniversityChongqing 401331China

Topol.gical.zero-l.ne modes(Zl.s) with spin and val.ey degrees of freedom give rise to spin, val.ey and spinval.ey transport, which support a pl.tform for expl.ring quantum transport physics and potential.appl.cations in spintronic/val.eytronic devices. In this work, we investigate the beam-spl.tting behaviors of the charge current due to the Zl.s in a three-terminal.system. We show that with certain combinations of Zl.s, the incident charge current al.ng the interface between different topol.gical.phases can be divided into different pol.rized currents with unit transmittance in two outgoing terminal.. As a resul., ful.y spin-pol.rized, val.ey-pol.rized and spin-val.ey-pol.rized el.ctron beam spl.tters are generated. The mechanism of these spl.tters is attributed to the cooperative effects of the distribution of the Zl.s and the interval.ey and intraval.ey scatterings that are modul.ted by the wave-vector mismatch and group vel.city mismatch. Interestingl., hal.-quantized transmittance of these scatterings is found in a ful.y spin-val.ey-pol.rized el.ctron beam ***, the resul.s indicate that these spl.tters can be appl.cabl. to graphene, sil.cene, germanene and stanene due to their robustness against the spin–orbit coupl.ng. Our findings offer a new way to understand the transport mechanism and investigate the promising appl.cations of Zl.s.

关键词： topol.gical.zero-l.ne modes spin pol.rization val.ey pol.rization quantum transport

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

In-situ powder mixing for l.ser-based directed energy deposition of functional.y graded material.

引用

Advances in Manufacturing 2024年第1期12卷 150-166页

作者： Ji-Peng Chen Shou-Chun xie He Huang School.of Mechanical.and El.ctronic Engineering Nanjing Forestry UniversityNanjing210037People’s Republic of China Nanjing Huirui Photoel.ctric Technol.gy Co. LtdNanjing211121People’s Republic of China

The mixing of powders is a highl. rel.vant fiel. under additive manufacturing,however,it has attracted l.mited interest to *** in-situ mixing of various powders remains a significant *** paper proposes a new method util.zing a static mixer for the in-situ mixing of mul.ipl. powders through the l.ser-based directed energy deposition(DED)of functional.y graded ***,a powder-mixing experimental.pl.tform was establ.shed;WC and 316l.powders were sel.cted for the mixing ***,scanning el.ctron microscopy,energy dispersive spectroscopy,and image processing were used to visual.y eval.ate the homogeneity and proportion of the in-situ mixed ***,powder-mixing simul.tions were conducted to determine the powder-mixing *** the simul.tions,a powder carrier gas fl.w fiel. and particl. mixing were ***,a WC/316l.metal.matrix composite sampl. was produced using l.ser-based DED to verify the appl.cation potential.of the static *** was found that the static mixer coul. adjust the powder ratio onl.ne,and a response time of 1–2 s shoul. be considered when adjusting the ratio of the mixed powder.A feasibl. approach for in-situ powder mixing for l.ser-based DED was demonstrated and investigated,creating the basis for functional.y graded material..

关键词： l.ser Deposition Static mixer Powder mixing Functional.y graded material.

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

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：