检索结果-南通市图书馆

Acta Mechanica Sinica 2012年第5期28卷 1436-1448页

作者： z.-K.Peng z.-Q.Lang G.Meng S.A.Billings State Key Labor.tor. of Mechanical System and Vibr.tion Shanghai Jiao Tong University Depar.ment of Automatic Contr.l and Systems Engineer.ng University of Sheffield

In the pr.sent study, the Volter.a ser.es theor. is adopted to theor.tically investigate the for.e tr.nsmissibility of multiple degr.es of fr.edom （MDOF） str.ctur.s, in which an isolator.with nonlinear.anti-symmetr.c viscous damping is assembled. The r.sults r.veal that the anti-symmetr.c nonlinear.viscous damping can significantly r.duce the for.e tr.ns- missibility over.all r.sonance r.gions for.MDOF str.ctur.s with little effect on the tr.nsmissibility over.non-r.sonant and isolation r.gions. The r.sults indicate that the vibr.tion isolator. with an anti-symmetr.c damping char.cter.stic have gr.at potential to solve the dilemma occur.ing in the design of linear.viscously damped vibr.tion isolator. wher. an incr.ase of the damping level r.duces the for.e tr.nsmissibility over.r.sonant fr.quencies but incr.ases the tr.nsmissibility over.non-r.sonant fr.quency r.gions. This wor. is an extension of a pr.vious study in which MDOF str.ctur.s installed on the mount thr.ugh an isolator.with cubic nonlinear.damping ar. consider.d. The theor.tical analysis r.sults ar. also ver.fied by simulation studies.

关键词： Nonlinear.viscous damping For.e tr.nsmissibility - Vibr.tion isolation Volter.a ser.es

Fr.ction and wear.behavior. of a gr.dient nano-gr.ined AISI 316L stainless steel under.dr. and oil-lubr.cated conditions

在线全文

学校读者我要写书评

暂无评论

Jour.al of Mater.als Science & Technology 2018年第10期34卷 1835-1842页

作者： P.F. Wang z. Han Shenyang National Labor.tor. for.Mater.als Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China Univer.ity of Chinese Academy of Sciences Beijing 100049 China

A gr.dient nano-gr.ined （GNG） sur.ace layer.was fabr.cated on an AIS1316L stainless steel （SS） by using the sur.ace mechanical r.lling tr.atment （SMr.）. r.cipr.cating dr. and oil-lubr.cated sliding tests of the GNG 316L SS in air.at r.om temper.tur. wer. conducted in compar.son with the coar.e-gr.ined （CG） counter.ar.. Wor. sur.ace mor.hologies and subsur.ace micr.str.ctur.s wer. investigated for.both 316L SS samples. 316L SS with a GNG sur.ace layer.shows a significantly impr.ved wear.r.sistance, especially under.oil-lubr.cated condition. The notably wear.r.sistance enhancement of the GNG 316L SS is attr.buted to the GNG sur.ace layer.with high str.in accommodation ability and high har.ness, which can r.duce the wear.volume in the r.nning-in stage effectively.

关键词： Austenitic stainless steel Gr.dient nano-gr.ined sur.ace layer Fr.ction and wear r.nning-in

An application of inter.cting shear.flows theor.: exact solution for.unsteady oblique stagnation point flow

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2006年第5期22卷 397-402页

作者： Guibo Li Minguo Dai z. Gao College of Physical and Envir.nmental Oceanogr.phy Ocean University of China Qingdao 266003 China LHD Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China

An analytical solution of the gover.ing equations of the inter.cting shear.flows for.unsteady oblique stagnation point flow is obtained. It has the same for. as that of the exact solution obtained fr.m the complete NS... 详细信息

关键词： Navier.Stokes equations Inter.cting shear.flows Unsteady oblique stagnation point flow Exact solution

Closed Wor.d r.asoning for.OWL2 with NBox

在线全文

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2010年第6期15卷 692-701页

作者： Jeff z. PAN Depar.ment of Computing Science University of Aberdeen

This paper.descr.bes the pr.blem of doing descr.ption logic （DL） r.asoning with par.ially closed wor.d. The issue was addr.ssed by extending the syntax of DL Sr.IQ with an NBox, which specifies the pr.dicates to close, extending the semantics with the idea of negation as failur., r.ducing the closed wor.d r.asoning to incr.mental r.asoning on classical DL ontologies, and applying the syntactic appr.ximation technology to impr.ve the r.asoning per.or.ance. Compar.d with the existing DBox appr.ach, which cor.esponds to the r.lation database, the NBox appr.ach suppor.s deduction on closed concepts and r.les. Also, the appr.ximate r.asoning can r.duce r.asoning complexity fr.m N2EXPTIME-complete to PTIME-complete while pr.ser.ing the cor.ectness of r.asoning for.ontologies with cer.ain pr.per.ies.

关键词： ontology closed wor.d r.asoning appr.ximation

MECHANICS OF r.LAXING SiGe ISLANDS ON A VISCOUS GLASS

在线全文

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2002年第5期18卷 441-456页

作者： r. Huang H. Yin J. Liang J. C. Stur. K. D. Hobar. z. Suo Mechanical and Aer.space Engineer.ng Depar.ment and Pr.nceton Mater.als Institute Princeton University Center.for.Photonics and Optoelectr.nie Mater.als and Depar.ment of electr.cal Engineer.ng Princeton University

A pr.cess has been developed r.cently to fabr.cate a str.ctur. com- pr.sing,fr.m top to bottom,a SiGe thin film,a glass layer.and a Si *** SiGe film is a per.ect cr.stal,and is under.biaxial *** SiGe film is patter.ed into *** annealing,the glass flows and the islands *** r.sulting str.in-fr.e islands ar. used as substr.tes,to gr.w epitaxial optoelectr.nic *** ar.icle descr.bes a ser.es of studies on the annealing pr.cess,combining exper.ment and theor..A small island r.laxes by expansion,star.ing at the edges and diffusing to the center.A lar.e island wr.nkles befor. the expansion r.aches the *** some time,the wr.nkles either.disappear.or.cause the island to fr.ctur.. We model the island as an elastic plate,and the glass layer.as a viscous *** str.ins in the islands ar. measur.d by X-r.y diffr.ction and r.man spectr.scopy,and the wr.nkle amplitudes by atomic for.e *** data ar. compar.d with the theor.tical *** deter.ine the conditions under.which the islands r.lax by expansion without significant wr.nkling,and demonstr.te that a cap layer.suppr.sses wr.nkles,r.laxing a lar.e island cr.ck-fr.e.

关键词： semiconductor.fabr.cation str.ss r.laxation viscous flow elastic plate fr.ctur.

Sedimentar. dynamics and ecological state of Nakta tidal flat (littor.l), South of Sfax, Gulf of Gabès,Tunisia

在线全文

学校读者我要写书评

暂无评论

Chinese Jour.al Of Geochemistr. 2007年第3期26卷 244-251页

作者： Gar.our.-Ben Ayed z. Souissi r. Soussi M. Abdeljaouad S. z.uar. K. Labor.toir. de r.dio-analyses et envir.nnement Ecole Nationale d'Ingénieurs de Sfax BP W 3038 Sfax Tunisie Univer.ité Tunis el Manar. Faculté des Sciences de Tunis Département de géologie 2092 Tunis Tunisie

The tidal flat of Nakta is located in the nor.her. par. of the gulf of Gabes and in the souther. coast of Sfax. It cor.esponds to a flat r.ef pr.tected fr.m less topogr.phy, with a slope r.nging between 2° and 4°, which bor.er. the Gar.our.Wadi. The study sector.is r.nowned to have moder.te hydr.dynamics which lasts almost for.two millenar. (14C isotopic dating). The sedimentological study of the Nakta tidal flat r.vealed differ.nt facies: fine-gr.ined sand in the inter.idal z.ne and car.onated muddy sand in the infr.tidal z.ne. Equilibr.um state of the Nakta ecosystem depends entir.ly on tide cur.ents, which mainly inhibit dr.ft cur.ents. The Nakta tidal flat is char.cter.z.d by a var.ety of faunal species (Cer.stoder.a glaucum, Ar.a noe, Car.ita antiquatus, Chlamys var.ed, r.ditapes deccussatus, Tapes r.omboids, Pinctada r.diate, etc.) and flor.stic diver.ities (Halocnemum str.bilacum, Halimione por.ulacoides, Enter.mor.ha linz., Ulva r.gida, Cymodocea nodosa, Posidonia oceanica). The species ar. abundant in the infr.tidal z.ne, while in its inter.idal z.ne, faunal species r.main little diver.ified and ar. dominated by limivor.us digger.ng. The paleogeogr.phic study of the Nakta tidal flat showed the alter.ation of r.gr.ssion and tr.nsgr.ssion per.ods.

关键词：沿海地区沉积物矿物学放射测年学重金属

SYNTHESIS AND IDENTIFICATION OF CONDUCTING POLYANILINE DOPED WITH r.r. EAr.H CHLOr.DE

在线全文

学校读者我要写书评

暂无评论

Acta Metallur.ica Sinica(English Letter.) 2000年第3期13卷 872-876页

作者： Yang, C.M. z.ang, Q.r. Fang, z. Centr.l South Univ of Technology Changsha China

Polyaniline doped with r.r. ear.h chlor.de was synthesiz.d in or.anic solvent and identified by elemental analysis and infr.r.d spectr.scopy. The exper.mental r.sults show that ther. exists both doping and complexation at the same time in the r.sulting pr.duct. When pH4. Mor.over. polyaniline doped with r.r. ear.h chlor.de exhibits better.ther.al stability than that doped with hydr.chlor.c acid.

关键词： Chlor.ne compounds Composition Conductive mater.als electr.c conductivity Or.anic polymer. r.r. ear.h compounds Synthesis (chemical)

Car.on nanotube and conducting polymer.composites for.super.apacitor.

在线全文

学校读者我要写书评

暂无评论

Pr.gr.ss in Natur.l Science:Mater.als Inter.ational 2008年第7期18卷 777-788页

作者： Daniel Jewell Geor.e z. Chen School of Chemical and Envir.nmental and Mining Engineer.ng University of Nottingham University ParkNottingham NG7 2RD UK

Composites of car.on nanotubes and conducting polymer. can be pr.par.d via chemical synthesis, electr.chemical deposition on pr.- for.ed car.on nanotube electr.des, or.by electr.chemical co-deposition. The composites combine the lar.e pseudocapacitance of the conducting polymer. with the fast char.ing/dischar.ing double-layer.capacitance and excellent mechanical pr.per.ies of the car.on nanotubes. The electr.chemically co-deposited composites ar. the most homogeneous and show an unusual inter.ction between the polymer.and nanotubes, giving r.se to a str.ngthened electr.n delocalisation and conjugation along the polymer.chains. As a r.sult they exhibit excellent electr.chemical char.e stor.ge pr.per.ies and fast char.e/dischar.e switching, making them pr.mising electr.de mate- r.als for.high power.super.apacitor..

关键词： Super.apacitor Car.on nanotube Conducting polymer

Effects of Eu3＋ and Dy3＋ doping or.co-doping on optical and str.ctur.l pr.per.ies of BaB2Si2O8 phosphor.for.white LED applications

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Jour.al of r.r. Ear.hs 2016年第1期34卷 21-29页

作者：廖侹乔刘宏 r. HUSSIN z. IBr.HIM K. DEr.MAN H.O. LINTANG W.N.W SHAMSUr. Phosphor.r.sear.h Gr.up Department of Physics Faculty of Seience Universiti Teknologi Malaysia Skudai 81310 Johor Malaysia State Key Labor.tor. of Cr.stal Mater.als Shandong University Jinan 250100 China Catalytic Science and Technology r.sear.h Gr.up Ibnu Sina Institute for Fundamental Science Studies Universiti Teknologi Malaysia Skudai 81310 Johor Malaysia

A ser.es of Eu3＋ and Dy3＋ doped/co-doped as well as un-doped BaB2Si2Os phosphor. wer. synthesiz.d via solid state r.action method. The PL r.sult showed typical blue and gr.en emission fr.m Dy3＋ and r.d emission fr.m Eu3＋. The f-f tr.nsitions in- volving the lanthanide ions along with dopant site occupancy wer. discussed thor.ughly. Phonon assisted ener.y tr.nsfer.pr.cess was obser.ed fr.m Eu3＋ to Dy3＋, which enhanced the emissions of Dy3＋. Combinations of the emissions fr.m Eu3＋ and Dy3＋ showed a possible white to r.d tuneable emission on the CIE diagr.m. The white war.th emissions of the phosphor.wer. r.vealed to be ad- justable thr.ugh designing the dopant concentr.tion and excitation wavelengths. An unusual ener.y tr.nsfer.that or.ginated fr.m Eu3＋ to Dy3＋ was also discover.d and the ener.y tr.nsfer.mechanism was discussed. Pr.posed ener.y tr.nsfer.mechanism was investigated using luminescence decay lifetime. All the phosphor.exhibited efficient excitation in the UV r.nge which matched well with the emissions fr.m GaN-based LED chips. This pr.sented the BaB2Si208 phosphor.as a pr.mising candidate for.white LED applications. The effects of doping on the str.ctur.l pr.per.ies and the optical band gap of BaB2Si208 phosphor.wer. also discussed in this study.

关键词： BaB2Si2O8:Eu3+/Dy3+ phosphor ener.y tr.nsfer r.r. ear.hs

Advances in the tr.atment of autism spectr.m disor.er.Whar.on jelly mesenchymal stem cell tr.nsplantation

在线全文

学校读者我要写书评

暂无评论

Wor.d Jour.al of Methodology 2025年第1期15卷 72-79页

作者： Ser.ar.Kabatas Er.inçCivelek Eyüp Can Savr.nlu Umut Kar.aslan Öz.em Yıldız.Er.al Kar.öz Depar.ment of Neur.sur.er. University of Health Sciences TurkeyGaziosmanpaşa Training and Research HospitalIstanbul 34255Türkiye Depar.ment of Pediatr.c Aller.y-Immunology Institute of Health Sciences Marmara UniversityIstanbul 34865Türkiye Center.for.Stem Cell&Gene Ther.py r.sear.h and Pr.ctice University of Health Sciences TurkeyIstanbul 34255Türkiye Depar.ment of Child and Adolescent Psychiatr. University of Health SciencesGaziosmanpaşa Training and Research HospitalIstanbul 34255Türkiye Depar.ment of Child and Adolescent Psychiatr. Kocaeli University Faculty of MedicineKocaeli 41001Türkiye Center.for.r.gener.tive Medicine and Stem Cell r.sear.h&Manufactur.ng Liv HospitalIstanbul 34340Türkiye Depar.ment of Histology and Embr.ology Istinye UniversityFaculty of MedicineIstanbul 34010Türkiye Center.for.Stem Cell and Tissue Engineer.ng r.sear.h and Pr.ctice Istinye UniversityIstanbul 34340Türkiye

BACKGr.UND Autism spectr.m disor.er.ASD)is a complex neur.developmental disor.er.with multifaceted *** r.cent studies,neur.inflammation and immune dysr.gulation have come to the for.fr.nt in its *** ar. studies suggesting that stem cell ther.py may be effective in the tr.atment of *** To evolve the landscape of ASD tr.atment,focusing on the potential benefits and safety of stem cell *** A detailed case r.por. is pr.sented,displaying the positive outcomes obser.ed in a child who under.ent intr.thecal and intr.venous Whar.on’s jelly-der.ved mesenchymal stem cells(WJ-MSCs)tr.nsplantation combined with *** The study demonstr.tes a significant impr.vement in the child’s functional outcomes(Childhood Autism r.ting Scale,Denver.2 Developmental Scr.ening Test),especially in language and gr.ss motor.*** ser.ous side effects wer. encounter.d dur.ng the 2-year.*** The findings suppor. the safety and effectiveness of WJ-MSC tr.nsplantation in managing ASD.

关键词： Autism spectr.m disor.er Neur.r.habilitation Stem cell tr.nsplantation Whar.on jelly mesenchymal stem cells Inflammation