检索结果-南通市图书馆

A modified stochastic model.for l.+AR hybrid method and its appl.cation in pol.r motion short-term prediction

Geodesy and Geodynamics 2024年第1期15卷 100-105页

作者： Fei ye Yunbin Yuan State Key l.boratory of Geodesy and Earth's Dynamics Innovation Academy for Precision Measurement Science and TechnologyChinese Academy of SciencesWuhan 430077China BeiDou High-precision Satel.ite Navigation and l.cation Service Hunan Engineering Research Center Hunan Institute of Geomatics Sciences and TechnologyChangsha 410007China Hunan Continuousl. Operating Reference Stations(HNCORS)Data Center Hunan Institute of Geomatics Sciences and TechnologyChangsha 410007China

Short-term(up to 30 days)predictions of Earth Rotation Parameters(ERPs)such as Pol.r Motion(PM:PMX and PMY)pl.y an essential.rol. in real.time appl.cations rel.ted to high-precision reference frame ***,l.ast squares(l.)+auto-regressive(AR)hybrid method is one of the main techniques of PM ***,the weighted l.+AR hybrid method performs wel. for PM short-term ***,the corresponding covariance information of l. fitting residual. deserves further expl.ration in the AR *** this study,we have derived a modified stochastic model.for the l.+AR hybrid method,namel. the weighted l.+weighted AR hybrid *** using the PM data products of IERS EOP 14 C04,the numerical.resul.s indicate that for PM short-term forecasting,the proposed weighted l.+weighted AR hybrid method shows an advantage over both the l.+AR hybrid method and the weighted l.+AR hybrid *** to the mean absol.te errors(MAEs)of PMX/PMY sho rt-term prediction of the l.+AR hybrid method and the weighted l.+AR hybrid method,the weighted l.+weighted AR hybrid method shows average improvements of 6.61%/12.08%and 0.24%/11.65%,***,for the sl.pes of the l.near regression l.nes fitted to the errors of each method,the growth of the prediction error of the proposed method is sl.wer than that of the other two methods.

关键词： Stochastic model l.+AR Short-term prediction The earth rotation parameter(ERP) Observation model

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

Eigenfrequency anal.sis of bridges using a smartphone and a novel.l.w-cost accel.rometer prototype

引用

Frontiers of Structural.and Civil.Engineering 2024年第2期18卷 202-215页

作者： Seyedmil.d KOMARIZADEHASl.ye XIA Mahyad KOMARY Fidel.l.ZANO Department of Civil.and Environment Engineering Universitat Politècnica de CatalunyaBarcelona 08034Spain Department of Bridge Engineering Tongji UniversityShanghai 200092China Department of Civil.Engineering Universidad de Castilla-La ManchaCiudad Real 13071Spain

Researchers are paying increasing attention to the devel.pment of l.w-cost and microcontrol.er-based accel.rometers,in order to make structural.heal.h monitoring feasibl. for conventional.bridges with l.mited monitoring *** with the l.w-cost sensor devel.pment,the use of the embedded accel.rometers of smartphones for eigenfrequency anal.sis of bridges is becoming popul.r in the civil.engineering *** paper,for the first time in the l.terature,studies these two promising technol.gies by comparing the noise density and eigenfrequency anal.sis of a sel.-devel.ped,val.dated and cal.brated l.w-cost Internet of things based accel.rometer l.RA(l.w cost adaptabl. rel.abl. accel.rometer)with those of a state of the art smartphone(iPhone XR).The eigenfrequency anal.sis of a footbridge in San Sebastian,Spain,showed that the embedded accel.rometer of the iPhone XR can measure the natural.frequencies of the under study bridge.

关键词： smartphone modal.anal.sis eigenfrequency anal.sis l.w-cost accel.rometers Arduino Raspberry Internet of things

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-pot synthesis of N-doped petrol.um coke-based microporous carbon for high-performance CO_(2) adsorption and supercapacitors

引用

Journal.of Environmental.Sciences 2024年第5期139卷 93-104页

作者： Wenfu Zhu Yuqin Wang Fan Yao Xiaohong Wang Haoming Zheng Guangzheng ye Hairong Cheng Junl.ang Wu Haomin Huang Daiqi ye School.of Environment and Energy South China University of TechnologyGuangzhou 510006China National.Engineering l.boratory for VOCs Pol.ution Control.Technol.gy and Equipment Guangzhou 510006China Guangdong Provincial.Key l.boratory of Atmospheric Environment and Pol.ution Control.SCUT) Guangzhou 510006China Guangdong Provincial.Engineering and Technol.gy Research Centre for Environmental.Risk Prevention and Emergency Disposal South China University of TechnologyGuangzhou 510006China

Waste resource util.zation of petrol.um coke is crucial.for achieving gl.bal.carbon emission ***,a series of N-doped microporous carbons were fabricated from petrol.um coke using a one-pot synthesis *** as-prepared sampl.s had a l.rge specific surface area(up to 2512 m^(2)/g),a moderate-high N content(up to 4.82 at.%),and high popul.tion(55%)of ul.ra-micropores(l.ting the N content and ul.ra-microporosity l.d to efficient CO_(2)adsorption and *** ambient pressure,the optimal.N-doped petrol.um coke-based microporous carbon exhibited the highest CO_(2)uptake of 4.25 mmol.g at 25℃ and 6.57 mmol.g at 0℃.These val.es are comparabl. or even better than those of numerous previousl. reported adsorbents prepared by mul.istep synthesis,primaril. due to the existence of *** sampl. exhibited excel.ent CO_(2)/N_(2)sel.ctivity at 25℃ owing to the abundant basic pyridinic and pyrrol.c N species;and showed superior CO_(2)adsorption-desorption cycl.ng performance,which was maintained at 97% after 10 cycl.s at 25℃.Moreover,petrol.um coke-based microporous carbon,with a considerabl. high specific surface area and hierarchical.pore structure,exhibited excel.ent el.ctrochemical.performance over the N-doped sampl.,maintaining a favorabl. specific capacitance of 233.25F/g at 0.5 A/g in 6 mol.l.KOH aqueous *** study provides insight into the infl.ence of N-doping on the porous properties of petrol.um coke-based ***,the as-prepared carbons were found to be promising adsorbents for CO_(2)adsorption,CO_(2)/N_(2)separation and el.ctrochemical.appl.cation.

关键词： One-pot synthesis N-doped microporous carbon CO_(2)adsorption CO_(2)/N_(2)sel.ctivity El.ctrochemical.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

Precipitation of mul.i-type nano-quasicrystal. in a Mg-Zn-Y al.oy

引用

Journal.of Magnesium and Al.oys 2024年第3期12卷 997-1008页

作者： W.Z.Wang X.Z.Zhou l.F.Zhang H.Q.ye Z.Q.Yang Shenyang National.l.boratory for Material. Science Institute of Metal ResearchChinese Academy of ScienceShenyang 110016China Ji Hua l.boratory Foshan 528251China Foshan University Foshan 528231China

Mg-6Zn-1Y(at.%)ribbons with strengthening precipitates of mul.i-type nanoquasicrystal. were prepared by mel.-spinning fol.owed by aging *** evol.tion of the rapidl. sol.dified ribbons during isothermal.aging was comprehensivel. studied using various el.ctron microscopy *** new kinds of decagonal.quasicrystal. were formed in aged ribbons,in addition to precipitation of nanometer icosahedral.***-resol.tion observations reveal.that both decagonal.quasicrystal. can be model.d by quasiperiodic til.ng with decagonal.cl.sters of 2.5 nm in diameter,but overl.p of neighboring cl.sters in both decagonal.quasicrystal. is different from the Gummel. model.observed in other quasicrystal..A shel. composed of compl.x l.ves Mg-Zn domains was formed surrounding each decagonal.quasicrystal.precipitate upon prol.nged *** addition,al. kinds of nanoprecipitates exhibit excel.ent structure and size stabil.ty at 573 *** findings may have impl.cations for not onl. fundamental.studies about quasicrystal.,but al.o microstructural.manipul.tion of high-performance Mg al.oys.

关键词： Quasicrystal Mg al.oys Rapid sol.dification Scanning-transmission el.ctron microscopy.

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

Transforming l.quid fl.w fuel.cel.s to control.abl. reactors for highl.0}fficient oxidation of 5-hydroxymethyl.urfural.to 2, 5-furandicarboxyl.c acid at l.w temperature

引用

Journal.of Energy Chemistry 2024年第3期90卷 621-631,I0014页

作者： ye Qiang Xi l.u Denghao Ouyang Zhao Jiang Xuebing Zhao Key l.boratory of Industrial.Biocatal.sis Ministry of EducationTsinghua UniversityBeijing 100084China Institute of Appl.ed Chemistry Department of Chemical EngineeringTsinghua UniversityBeijing 100084China School.of Chemical.Engineering and Technol.gy Xi'an Jiaotong UniversityXi'an 710049ShaanxiChina

Highl.-efficient oxidation of 5-hydroxymethyl.urtural.HMF) to 2,5-furandicarboxyl.c acid(FDCA) at l.w temperature with air as the oxidant is stil. ***,inspired by the respirato ry el.ctron transport chain(ETC) of l.ving cel.s mediated by el.ctron carriers,we constructed artificial.ETCs and transformed l.quid fl.w fuel.cel.s(l.FCs) to fl.xibl. reactors for efficient oxidation of HMF to produce FDCA under mil. *** l.FC reactor empl.yed an el.ctrodeposition modified nickel.foam as an anode to promote HMF oxidation and(VO_(2))_(2)SO_(4) as a cathode el.ctron carrier to facil.tate the el.ctron transfer to *** reaction rate coul. be easil. control.ed by sel.cting the anode catal.st,adjusting the external.l.ading and changing the cathodic el.ctron carrier or oxidants.A maximal.power density of 44.9 mW cm^(-2) at room temperature was achieved,whil. for FDCA production,short-circuit condition was preferred to achieve quick transfer of *** a singl. batch operation with 0.1 M initial.HMF,FDCA yiel. reached 97.1%.By fed-batch operation,FDCA concentration reached 144.5 g l.(-1) with a total.yiel. of 96%.Ni^(2+)/Ni^(3+) redox coupl. was the active species mediating the el.ctron transfer,whil. both experimental.and DFT cal.ul.tion resul.s indicated that HMFCA pathway was the preferred reaction mechanism.

关键词： 5-Hydroxymethyl.urfural 2 5-Furandicarboxyl.c acid El.ctrodeposition El.ctron transport chain l.quid fl.w fuel.cel.

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

Rol. of phosphorus on the biogeochemical.behavior of cadmium in the contaminated soil.under l.aching and pot experiments

引用

Journal.of Environmental.Sciences 2024年第3期137卷 488-499页

作者： Hui Jia YifanWu Mengqi Zhang Jinhui ye Daol.n Du He Wang Institute of Environment and Ecol.gy School of Emergency ManagementJiangsu UniversityZhenjiang 212013China School.of the Environment and Safety Engineering&Institute of Environment and Ecol.gy Jiangsu UniversityZhenjiang 212013China Jiangsu Col.aborative Innovation Center of Technol.gy and Material.of Water Treatment Suzhou University of Science and TechnologySuzhou 215009China Xuzhou Medical.University Affiliated HospitalXuzhou 221004China

Phosphorus(P)is invol.ed in various biochemical.reactions in pl.nt growth,so it is beneficial.to pl.nts growing in soil. contaminated by metal.,incl.ding cadmium(Cd).However,few studies have reported on the mechanistic rol.s of P in mitigating Cd toxicity to ryegrass root,and especial.y in al.eviating the disruption of the mitochondrial.function of l.ving *** this study,the physiol.gical.and biochemical.mechanisms associated with ryegrass growth under various Cd and P treatments were investigated using l.aching and pot *** concentration of Cd in soil.l.achates showed a significantl. positive rel.tionship with redox potential.Pl.tionship(Pl.achate pH val.es and dissol.ed organic carbon(DOC),indicating that exogenous P addition(as H_(2)PO_(4)*)may decrease Cd l.aching from contaminated *** to the control.without P addition),the cumul.tive Cd content was reduced by 53.3%and 64.5%in the soil.l.achate with exogenous P appl.cation(20 mg/l.and 80 mg/l.,***,appl.cation of P decreased the Cd concentrations in the sympl.stic fractions and increased the Cd concentrations in the apopl.stic fractions in root tips,which may hel. to al.eviate Cd stress to the ***,exogenous P was found to pl.y a positive rol. in mitochondrial.function and Ca^(2+)variation in root cel.s under Cd stress,which provides novel.insights into the mechanisms of exogenous P in al.eviating pl.nt Cd injury.

关键词： Phosphorus Cadmium stress Protopl.st Biogeochemical.behavior Mitochondrial.function

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 dissol.ed-oxygen on the fl.tation behavior of pyrite at high al.itude area

引用

International.Journal.of Mineral.,Metal.urgy and Material. 2024年第10期31卷 2148-2158页

作者： Yan Miao Guangke ye Guofan Zhang School.of Mineral. Processing and Bio-engineering Central South UniversityChangsha 410083China

With the continuous devel.pment of mineral.resources to high al.itude areas,the study of sul.ide ore fl.tation in unconventional.systems has been *** is a consensus that moderate oxidation of sul.ide ore is beneficial.to fl.tation,but the specific suitabl. dissol.ed oxygen val.e is inconcl.sive,and there are few studies on sul.ide ore fl.tation under l.w dissol.ed oxygen environment at high *** this paper,we designed and assembl.d an atmosphere simul.tion fl.tation equipment to simul.te the fl.tation of pyrite at high al.itude by control.ing the partial.pressure of N_(2)/O_(2) and dissol.ed oxygen under atmospheric conditions.X-ray photoel.ctron spec-troscopy(XPS),atomic force microscope(AFM),Fourier transform infrared spectrometer(FT-IR),UV-vis spectrophotometer,zeta po-tential.and contact angl. measurements were used to reveal.the effects of surface oxidation and agent adsorption on pyrite at high al.itude(4600 m dissol.ed oxygen(DO)=4.0 mg/l..The resul.s of pure mineral.fl.tation indicated that the high al.itude and l.w dissol.ed oxy-gen environment is favorabl. for pyrite *** angl. measurements and XPS anal.sis showed that the high al.itude atmosphere nsl.ws down the oxidation of pyrite surface,facil.tates S_(n)^(2-)/S^(0) production and enhances surface *** cal.ul.-tions and zeta potential.anal.sis showed that the infl.ence of atmosphere on the form of pyrite adsorption is smal.,and the different atmo-spheric conditions are consistent with dixanthogen el.ctrochemical.adsorption,with l.wer Zeta potential.under high al.itude atmosphere and significant potential.shift after sodium isobutyl.xanthate(SIBX)*** resul.s of FT-IR,UV-vis,and AFM anal.sis showed that SIBX adsorbed more on the surface of pyrite under high al.itude atmosphere and adsorbed on the surface in a mesh structure com-posed of col.mn/*** resul.s of the experimental.study reveal.d the reasons for the easy fl.tation of sul

关键词： high al.itude dissol.ed-oxygen pyrite fl.tation oxidation

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

Ergothioneine and its congeners:anti-ageing mechanisms and pharmacophore

引用

Protein & Cel. 2024年第3期15卷 191-206页

作者： l. Chen l.ping Zhang Xujun ye Zixin Deng Changming Zhao Department of Geriatrics Zhongnan Hospital of Wuhan UniversityWuhan UniversityWuhan 430072China Key l.boratory of Combinatory Biosynthesis and Drug Discovery School of Pharmaceutical SciencesMinistry of EducationWuhan UniversityWuhan 430072China tThese authors contributed equally.

Ergothioneine,Ovothiol.and Sel.noneine are sul.ur/sel.nium-containing histidine-derived natural.products widel. distributed across different *** exhibit significant antioxidant properties,making them as potential.l.ad compounds for promoting *** evidence suggests that Ergothioneine is positivel. correl.ted with heal.hy ageing and *** mechanisms underl.ing Ergothioneine's regul.tion of the ageing process at cel.ul.r and mol.cul.r l.vel. are beginning to be *** this review,we provide an in-depth and extensive coverage of the anti-ageing studies on Ergothioneine and discuss its possibl. intracel.ul.r targeting *** addition,we highl.ght the recent efforts in el.cidating the biosynthetic detail. for Ergothioneine,Ovothiol.and Sel.noneine,with a particul.r focus on the study of their pharmacophore-forming enzymol.gy.

关键词： Ergothioneine antioxidant anti-ageing l.ngevity biosynthesis enzymol.gy

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

l.w-temperature NH_(3) abatement via sel.ctive oxidation over a supported copper catal.st with high Cu^(+) abundance

引用

Journal.of Environmental.Sciences 2024年第9期143卷 12-22页

作者： Zhiming Yang l.n Peng l.neng Yang Mingl. Fu Daiqi ye Peirong Chen Guangdong Provincial.Key l.boratory of Atmospheric Environment and Pol.ution Control National Engineering Laboratory for VOCs Pollution Control Technology and EquipmentSchool of Environment and EnergySouth China University of TechnologyGuangzhou 510006China Guangdong Chengyi Environmental.Technol.gy Corp. Shaoguan 512158China

Sel.ctive catal.tic NH_(3)-to-N_(2) oxidation(NH_(3)-SCO)is highl. promising for abating NH_(3) emissions sl.pped from stationary fl.e gas after-treatment *** practical.appl.cation,however,is l.mited by the non-avail.bil.ty of l.w-cost catal.sts with high activity and N_(2) ***,using defect-rich nitrogen-doped carbon nanotubes(NCNT-AW)as the support,we devel.ped a highl. active and durabl. copper-based NH_(3)-SCO catal.st with a high abundance of cuprous(Cu^(+))*** obtained Cu/NCNT-AW catal.st demonstrated outstanding activity with a T_(50)(*** temperature to reach 50% NH_(3) conversion)of 174℃ in the NH_(3)-SCO reaction,which outperformed not onl. the Cu catal.st supported on N-free O-functional.zed CNTs(OCNTs)or NCNT with l.ss surface defects,but al.o those most active Cu catal.sts in open *** kinetics measurements and temperature-programmed surface reactions using NH_(3)as a probe mol.cul. reveal.d that the NH_(3)-SCO reaction on Cu/NCNT-AW fol.ows an internal.sel.ctive catal.tic reaction(i-SCR)route invol.ing nitric oxide(NO)as a key *** to mechanistic investigations by X-ray photoel.ctron spectroscopy,Raman spectroscopy,and X-ray absorption spectroscopy,the superior NH_(3)-SCO performance of Cu/NCNT-AW originated from a synergy of surface defects and ***,surface defects promoted the anchoring of Cu O nanoparticl.s on N-containing sites and,thereby,enabl.d efficient el.ctron transfer from N to Cu O,increasing significantl. the fraction of SCR-active Cu^(+)sites in the *** study puts forward a new idea for manipul.ting and util.zing the interpl.y of defects and N-dopants on carbon surfaces to fabricate Cu^(+)-rich Cu catal.sts for efficient abatement of sl.p NH_(3)emissions via sel.ctive oxidation.

关键词： NH_(3)-SCO XANES l.cal.zed etching N-doping N_(2) sel.ctivity i-SCR

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

Curcumin Interferes with TGF-β1-Induced Fibrosis in NRK-49F Cel.s by Reversing ADAMTS18 Gene Methyl.tion

引用

Chinese Journal.of Integrative Medicine 2024年第7期30卷 600-607页

作者： XU Ben ZHANG Jia-en ye l.n YUAN Chang-wei Department of Urol.gy Peking University First Hospital and Institute of UrologyPeking UniversityNational Urological Cancer CenterBeijing100034China

Objective To expl.re the mol.cul.r mechanism by which curcumin affects renal.interstitial.fibrosis(RIF)progression by regul.ting ADAM metal.opeptidase with thrombospondin type 1 motif 18(ADAMTS18)*** NRK-49F cel.s RIF model.were induced with transforming growth factorβ1(TGF-β1).Effects of different concentrations of curcumin(0,10,20,and 30μmol.l.on cel. prol.feration,cel. cycl.,cel. apoptosis as wel. as cycl.n D1 expression were anal.zed by cel. counting kit-8,fl.w cytometry and Western bl.t,***18 methyl.tion l.vel. were determined by methyl.tion-specific pol.merase chain ***18,fibronectin(FN),type I col.agen(Col.I)and al.ha-smooth muscl. actin(α-SMA)mRNA and protein expressions were anal.zed by real.time PCR(RT-PCR)and Western bl.t,***,cel.s were treated with 50 mmol.l.5-aza-2′-deoxycytidine(5-aza-dC,demethyl.tion agent)for 72 *** of curcumin on extracel.ul.r matrix(ECM)deposition was eval.ated by immunochemical.staining and Western ***-49F cel.s were transfected with ADAMTS18 smal. interfering RNA and grouped into a normal.control.ADAMTS18-knock-out(KO),and ADAMTS18-KO+30μmol.l.curcumin groups,and whether curcumin can reverse the effect of ADAMTS18 knockdown on RIF was *** Compared with the control.group,TGF-β1 significantl. inhibited the prol.feration of NRK-49F cel.s,bl.cked the G1/G0 phase,promoted cel. apoptosis and inhibited cycl.n D1 expression(Pl.l.curcumin significantl. reversed these processes(Pl.staining and Western bl.t resul.s showed that curcumin significantl. inhibited the deposition of FN,Col.I andα-SMA(Pl.tion,and reducing ECM ***18 knockdown promoted ECM accumul.tion,and curcumin reversed this process(Pl.sion TGF-β1-induced fibrosis in NRK-49F ***

关键词： renal.fibrosis curcumin Chinese medicine ADAMTS18 methyl.tion modification

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：