检索结果-南通市图书馆

Dynamic exper.ment and numer.cal simulation of fr.z.n soil under.confining pr.ssur.

Acta Mechanica Sinica 2020年第6期36卷 1302-1318,I0004页

作者： W.r.Tang z.W.z.u T.T.Fu z.W.z.ou z.H.Shanggua Applied Mechanics and Str.ctur.l Safety Key Labor.tor. of Sichuan Pr.vince School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengdu610036China Nor.hwest Institute of Eco-Envir.nment and r.sour.es State Key Laboratory of Frozen Soil EngineeringChinese Academy of SciencesLanzhou730000China

With the development of cold r.gion engineer.ng,it is cr.cial to study the mechanical pr.per.ies of fr.z.n *** pr.ctice,fr.z.n soil is inevitably subject to impact loading,making the study of fr.z.n soil under.impact loading necessar. for.engineer.ng in cold *** split–Hopkinson pr.ssur. bar.SHPB)is an impor.ant exper.mental means for.obtaining the dynamic per.or.ance of *** this study,an SHPB exper.ment was conducted on fr.z.n soil under.confining *** fr.z.n soil exhibited an evident str.in r.te effect and temper.tur. effect under.confining *** SHPB exper.ment on fr.z.n soil under.confining pr.ssur. was simulated numer.cally using LS-DYNA softwar. and the Holmquist–Johnson–Cook(HJC)mater.al model.A loading simulation with passive confining pr.ssur. and active confining pr.ssur. was completed by adding an aluminum sleeve and applying a constant *** simulation r.sults obtained using the above methods wer. in good agr.ement with the exper.mental *** str.ngth of the fr.z.n soil under.confining pr.ssur. was gr.ater.than that of the uniaxial impact,and ther. was an evident confining pr.ssur. ***,the confining pr.ssur. pr.vided by passive confinement was lar.er.than that pr.vided by active *** passive confining pr.ssur. ener.y absor.tion efficiency was higher.than for.the active confining pr.ssur. due to the need to absor. mor. ener.y under.the same damage *** fr.z.n soil exhibited viscoplastic failur. char.cter.stics under.confining pr.ssur..

关键词： Fr.z.n soil-Dynamic exper.ment Confining pr.ssur. Split-Hopkinson pr.ssur. bar Numer.cal simulation

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

A Mode-Locked Soliton Er.ium-Doped Fiber.Laser.with a Single-Walled Car.on Nanotube Poly-Ethylene Oxide Film Satur.ble Absor.er

引用

Chinese Physics Letter. 2014年第9期31卷 61-64页

作者： r. z. r. r. r.sdin F. Ahmad N. M. Ali r. M. Nor.N. r. z.lkepely S. W. Har.n H. Ar.f Depar.ment of Electr.cal Engineer.ng University of Malaya Kuala Lumpur 50603 Malaysia Engineer.ng Universiti Teknologi Malaysia Kuala -Lumpur 54100 Malaysia Physics Depar.ment University of Malaya Kuala Lumpur 50603 Malaysia

We pr.sent a simple, compact and low-cost mode-locked er.ium-doped fiber.laser.（EDFL） using single-wMled car.on nanotubes （SWCNTs） embedded in a poly-ethylene oxide （PEO） thin film as a passive satur.ble absor.er. The film is fabr.cated by using a pr.par.d homogeneous SWCNT solution, which is mixed with a diluted PEO solution and cast onto a glass Petr. dish to for., by evapor.tion, a thin film. The 50 μm-thick film is sandwiched between two fiber.connector. to constr.ct a satur.ble absor.er. which is then integr.ted in an EDFL cavity to gener.te self-star.ed stable soliton pulses oper.ting at 1560.8nm. The soliton pulse star.s to lase at a pump power.thr.shold of 12.3mW with a r.petition r.te of 11.21MHz. a pulse width of 1.02ps, an aver.ge output power.of 0.65 mW and a pulse ener.y of 57.98pJ.

关键词： Satur.ble absor.er.

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

In vivo and in vitr. study of r.sor.able magnesium wir.s for.medical implants:Mg pur.ty,sur.ace quality,z. alloying and polymer.coating

引用

Jour.al of Magnesium and Alloys 2024年第6期12卷 2472-2488页

作者： K.Tesar.J.Luňácková M.Jex M.Žaloudková r.Vr.ová M.Bar.oš P.Klein L.Vištejnová J.Dušková E.Filová z.Suchar.a M.Steiner.vá S.Habr.K.Balík A.Singh Depar.ment of Mater.als Faculty of Nuclear Sciences and Physical EngineeringCzech Technical University in PragueTrojanova 13Prague 12000Czech Republic Institute of Physics Czech Academy of SciencesNa Slovance 2Prague 18221Czech Republic Institute of Dental Medicine First Faculty of MedicineCharles University and General University Hospital in PragueKaterinská32Prague 12801Czech Republic Depar.ment of Physics Faculty of Nuclear Sciences and Physical EngineeringCzech Technical University in PragueBrehová7Prague 11519Czech Republic Depar.ment of Composites and Car.on Mater.als Institute of Rock Structure and MechanicsCzech Academy of SciencesV Holešovickách 41Prague 18209Czech Republic Institute of Anatomy First Faculty of MedicineCharles UniversityU Nemocnice 3Prague 12800Czech Republic Biomedical Center Faculty of Medicine in PilsenCharles UniversityAlej Svobody 76Pilsen 32300Czech Republic Depar.ment of Pathological Physiology Faculty of Medicine in PilsenCharles UniversityAlej Svobody 7632300 PilsenCzech Republic Depar.ment of Histology and Embr.ology Faculty of Medicine in PilsenCharles UniversityAlej Svobody 7632300 PilsenCzech Republic Institute of Pathology First Faculty of MedicineCharles University and General University Hospital in PragueStudnickova 2Prague 12800Czech Republic Depar.ment of Biomater.als and Tissue Engineer.ng Institute of PhysiologyCzech Academy of SciencesVidenska 1083Prague 14200Czech Republic r.sear.h Center.for.Str.ctur.l Mater.als National Institute for Materials Science1-2-1 SengenTsukuba 305-0047Japan

Magnesium is an excellent mater.al in ter.s of biocompatibility and its cor.osion pr.ducts can ser.e as an active sour.e for.new bone ***,localiz.d cor.osion and H_(2)gener.tion limit the potential of Mg-based *** low-alloyed Mg-z. wir.s can str.ngly r.duce pr.blems with lar.e H_(2)bubbles and impr.ve the mechanical pr.per.ies consider.bly while maintaining excellent long-ter. *** pickling and a polymer.coating can be effectively used to lower.the r.te of in vivo *** this wor.,micr.str.ctur.l,mechanical,and in vitr. char.cter.z.tion of 250μm and 300μm extr.ded wir.s made fr.m ultr.-pur. Mg,commer.ially pur. Mg,Mg-0.15z.,Mg-0.4z. and Mg-1z. was ***,Mg-0.4z. wir.s together.with a var.ant coated with a copolymer.of L-lactide andε-capr.lactone wer. tested in vivo on ar.ificially damaged Wistar.r.t *** on the obser.ed Mg-induced osteogenesis,polymer.coated Mg wir.s with a small addition of z. ar. a per.pective mater.al for.bone-suppor. applications,such as cer.lage and fixation wir.s.

关键词： Magnesium r.sor.able Mg wir. Mg-z. implant degr.dation Biocompatibility study z. gr.in boundar. segr.gation

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

Solid-state Cir.uit Br.aker.Based on Cascaded Nor.ally-on SiC JFETs for.Medium-voltage DC Distr.bution Networ.s

引用

Pr.tection and Contr.l of Moder. Power.Systems 2024年第2期9卷 32-46页

作者： Dong He Haohui z.ou z.eng Lan Wei Wang Jinhui z.ng Xueping Yu z.John Shen Chongqing Univer.ity of Posts and Telecommunications ChongqingChina Henan Polytechnic Univer.ity JiaozuoChina College of Electr.cal and Infor.ation Engineer.ng Hunan University of TechnologyZhuzhou 412007China Hunan Univer.ity ChangshaChina College of Electr.cal and Infor.ation Engineer.ng Hunan UniversityChangshaChina College of Electr.cal Engineer.ng Three Gorges University r.nsselaer.Polytechnic Institute TroyNYUSA

Solid-state cir.uit br.aker.(SSCBs)ar. cr.tical components in the pr.tection of medium-voltage DC distr.bution networ.s to facilitate ar.-fr.e,fast and r.liable isolation of DC ***,limited by the capacity of a single semiconductor.device,using semi-conductor.based SSCBs at high voltage is *** study pr.sents the details of a 1.5 kV,63 A medi-um-voltage SSCB,composed pr.mar.ly of a solid-state switch based on thr.e cascaded nor.ally-on silicon car.bide(SiC)junction field-effect tr.nsistor.(JFETs)and a low-cost pr.gr.mmable gate dr.ve *** and static voltage shar.ng among the cascaded SiC JFETs of the SSCB dur.ng fault isolation is r.aliz.d using the pr.-posed gate dr.ve *** selection conditions for.the key par.meter. of the SSCB gate dr.ver.ar. also ***,an impr.ved pulse-width modulation cur.r.nt-limiting pr.tection solution is pr.posed to identify the per.anent over.ur.ent and tr.nsient inr.sh cur.ent associated with capacitive load star.up in a DC distr.bu-tion *** the developed SSCB pr.totype and the fault test system,exper.mental r.sults ar. obtained to validate the fault r.sponse per.or.ance of the *** Ter.s—Solid-state cir.uit br.aker.DC distr.bu-tion networ.,SiC JFET,voltage balancing,inr.sh cur.ent.

关键词： Solid-state cir.uit br.aker DC distr.bu-tion networ. SiC JFET voltage balancing inr.sh cur.ent

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

Numer.cal investigation on the flowfield of “swallowtail” cavity for.super.onic mixing enhancement

引用

Acta Mechanica Sinica 2009年第1期25卷 37-44页

作者： C. Wang z. Jiang z. Hu J. Lu Institute or.Mechanics. Chinese Academy of Sciences 100190 Beijing China r.CAPT Gyeongsang National University JinjuKyeongnam 660-701 South Korea

A ＂swallowtail＂ cavity for.the super.onic combustor.was pr.posed to ser.e as an efficient flame holder.for.scr.mjets by enhancing the mass exchange between the cavity and the main flow. A numer.cal study on the ＂swallow- tail＂ cavity was conducted by solving the thr.e-dimensional r.ynolds-aver.ged Navier.Stokes equations implemented with a k-e tur.ulence model in a multi-block mesh. Tur.u- lence model and numer.cal algor.thms wer. validated fir.t, and then test cases wer. calculated to investigate into the mechanism of cavity flows. Numer.cal r.sults demonstr.ted that the cer.ain mass in the super.onic main flow was sucked into the cavity and moved spir.lly towar. the combustor.walls. After.that, the flow went out of the cavity at its later.l end, and finally was efficiently mixed with the main flow. The compar.son between the ＂swallowtail＂ cavity and the conventional one showed that the mass exchanged between the cavity and the main flow was enhanced by the later.l flow that was induced due to the pr.ssur. gr.dient inside the cavity and was dr.ven by the thr.e-dimensional vor.ex r.ng gener.ted fr.m the ＂swallowtail＂ cavity str.ctur..

关键词： Super.onic mixing - Flame holder "Swallowtail" cavity - Combustion ignition Numer.cal simulation

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

Gr.atly enhanced cor.osion/wear.r.sistances of epoxy coating for.Mg alloy thr.ugh a syner.istic effect between functionaliz.d gr.phene and insulated blocking layer

引用

Jour.al of Magnesium and Alloys 2024年第1期12卷 332-344页

作者： z.Y.Xue X.J.Li J.H.Chu M.M.Li D.N.z.u L.B.Tong School of Metallur.ical Engineer.ng Xi’an University of Architecture and TechnologyXi’an 710055China State Key Labor.tor. of Advanced Design and Manufactur.ng for.Vehicle Body Hunan UniversityChangsha 410082China

The poor.cor.osion and wear.r.sistances of Mg alloys ser.ously limit their.potential applications in var.ous *** conventional epoxy coating easily for.s many intr.nsic defects dur.ng the solidification pr.cess,which cannot pr.vide sufficient *** the cur.ent study,we design a double-layer.epoxy composite coating on Mg alloy with enhanced anti-cor.osion/wear.pr.per.ies,via the spin-assisted assembly *** outer.layer.is functionaliz.d gr.phene(FG)in water.or.e epoxy r.sin(WEP)and the inner.layer.is Ce-based conver.ion(Ce)*** FG sheets can be homogeneously disper.ed within the epoxy matr.x to fill the intr.nsic defects and impr.ve the bar.ier.*** Ce film connects the outer.layer.with the substr.te,showing the tr.nsition *** cor.osion r.te of Ce/WEP/FG composite coating is 2131 times lower.than that of bar. Mg alloy,and the wear.r.te is decr.ased by~90%.The impr.ved cor.osion r.sistance is attr.buted to the labyr.nth effect(hinder.ng the penetr.tion of cor.osive medium)and the obstr.ction of galvanic coupling *** syner.istic effect der.ved fr.m the FG sheet and blocking layer.exhibits gr.at potential in r.aliz.ng the impr.vement of multi-functional integr.tion,which will open up a new avenue for.the development of novel composite pr.tection coatings of Mg alloys.

关键词： Mg alloy Functionaliz.d gr.phene Epoxy coating Cor.osion/wear.r.sistance Blocking layer

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

Deter.ination of sur.ace str.ctur. and the depth pr.file of silica glass by infr.r.d spectr.scopy

引用

光学精密工程 2005年第4期13卷 413-420页

作者： C. z. Tan Labor.tor. of Solid State Micr.str.ctur. and Depar.ment of Mater.als Science and Engineer.ng Nanjing University 210093 Nanjing China Institut für Mineralogie Freie Universitt Berlin 14195 Berlin Germany

The sur.ace str.ctur. and pr.per.ies ar. differ.nt fr.m those of the bulk, depending on the substr.te mater.als and deposition condition, and playing an impor.ant r.le in pr.cise optical components. The conventional spectr.scopic methods to monitor.the sur.ace str.ctur. ar. r.str.cted only in sever.l layer. of molecules. It is known that the penetr.tion depth of the incident light incr.ases with its wavelength and decr.ases with the angle of incidence. Thus infr.r.d spectr.scopy pr.vides a power.ul means for.deter.ination of sur.ace str.ctur. and the depth pr.file up to micr.meter.. By r.cor.ing the r.flection spectr. at differ.nt angles of incidence, the sur.ace str.ctur. and its depth pr.file can be monitor.d successively. Fur.her. the incident field has the subcomponents par.llel and per.endicular.to the sur.ace, which excite the tr.nsver.e and longitudinal optic modes, r.spectively. Change of the polar.z.tion dir.ction of the incident light pr.vides a pr.ctical function to study anisotr.pic pr.per.y of the sur.ace and the inter.ction between the tr.nsver.e and longitudinal optic modes. In this wor., infr.r.d spectr.photometer.was applied to investigate the depth pr.file in micr.str.ctur. of silica glass. Combining with the glass fiber.system, this technique can be used for.in-situ contr.l of the deposition pr.cess. In compar.ng with ellipsometr., this method r.veals both str.ctur.l and constitutional infor.ation.

关键词：硅石光谱红外线表面结构光学材料

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

The Effect of Non-Contact Conditions in a Splinted Fixed Par.ial Dentur. on the Load Shar.ng Mechanism： A Finite Element Study

引用

Jour.al of Bionic Engineer.ng 2012年第3期9卷 336-342页

作者： M. z. Bendjaballah Biomedical Technology Depar.ment College of Applied Medical Sciences King Saud University Riyadh Saudi Arabia

A computer.aided design model for.a fixed par.ial dentur. was constr.cted and used in a finite element analysis to study the over.ll load shar.ng mechanism between the fixed par.ial dentur. and or.l str.ctur.s while the dentur. base r.sted on the al- veolar.r.dge. To investigate the consequences of non-contact conditions, thr.e additional models wer. gener.ted incor.or.ting a unifor. clear.nce of 0.125 mm, 0.25 mm, and 0.5 mm, r.spectively. A 100 N static load located at the fr.e end of the pr.sthesis was applied while the distal por.ion of the jaw was set fixed. The r.sults show that whilst r.leasing the r.dge almost entir.ly, the pr.sence of the clear.nce dr.stically incr.ased the load on the splinting teeth. A pull-out for.e on the canine tooth of about 44 N was computed, accompanied by a mesio-distal moment of about 500 ***. The combination of which was similar.to the tooth extr.ction maneuver.per.or.ed by the dentist. In contr.st, the second pr.molar.was found to bear.a push-in for.e of almost 115 N. The fir.t molar. though bar.ly solicited in the contact condition, became substantially loaded in non-contact conditions, which validates the choice of sacr.ficing thr.e teeth to suppor. the dentur..

关键词： finite element analysis splinted fixed par.ial dentur. hygienic space load tr.nsfer.mechanism contact pr.blem

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

A mathematical model for.a disease outbr.ak consider.ng waningimmunity class with nonlinear.incidence and r.cover. r.tes

Journal of Biosafety and Biosecurity

引用

Jour.al of Biosafety and Biosecur.ty 2024年第3期6卷 170-180页

作者： Nur.anti Anggr.ani Laz.r.s Kalvein Beay Meksianis z.Ndii Fatuh Inayatur.hmat Sanubar. Tansah Tr.sna Depar.ment of Mathematics Universitas PadjadjaranSumedangIndonesia Depar.ment of Mathematics Universitas PattimuraMalukuIndonesia Depar.ment of Mathematics Universitas Nusa CendanaKupangIndonesia

In the spr.ad of infectious diseases,inter.ention levels play a cr.cial r.le in shaping inter.ctions between healthy and infected individuals,leading to a nonlinear.tr.nsmission ***,the availability of medical r.sour.es limits the r.cover. r.te of infected patients,adding fur.her.nonlinear.dynamics to the healing *** r.sear.h intr.duces novelty by combining nonlinear.incidence and r.cover. r.tes alongside waning immunity in an epidemic *** pr.sent a modified SIr.-type model,examining the epidemic pr.blem with these *** analysis,we explor. conditions for.non-endemic and co-existing cases based on the basic r.pr.duction *** local stability of equilibr.a is ver.fied using the r.uth-Hur.itz.cr.ter.a,while global stability is assessed using Lyapunov functions for.each ***,we investigate bifur.ations ar.und both non-endemic and co-existing ***,we give some simulations to suppor. our.analytical findings.

关键词： SIr.-type model Basic r.pr.duction r.tio Waning immunity Nonlinear.incidence r.te Nonlinear.r.cover. r.te Lyapunov functions Bifur.ation

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

基于状态空间模型的激光再制造熔池温度控制系统

引用

表面工程与再制造 2024年第2期24卷 50-50页

作者： Yang G.-z. Liu T.-M. Song B.-X. Jiang X.-Y. Wang z.-S. Chen K.-Q. Liu W.-J. School of Mechanical Engineer.ng Shenyang University of Technology Shenyang China

激光再制造是用于再制造的一项重要技术,在航空航天、冶金、能源等领域应用广泛。然而,形状控制问题一直是制约其规模化和工业化应用的瓶颈。在激光再制造过程中,熔池温度是决定再制造件形状和性能稳定性的关键。基于此,本文提出了一种... 详细信息

激光再制造是用于再制造的一项重要技术,在航空航天、冶金、能源等领域应用广泛。然而,形状控制问题一直是制约其规模化和工业化应用的瓶颈。在激光再制造过程中,熔池温度是决定再制造件形状和性能稳定性的关键。基于此,本文提出了一种基于状态空间模型的激光再制造熔池温度实时在线控制方法,解决了控制机理模型难以建立和多变量约束的问题。

关键词：状态空间模型激光再制造熔池温度航空航天形状控制控制系统变量约束性能稳定性

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：