检索结果-南通市图书馆

Development of a.six drillhea. roof bolting ma.hine

Interna.iona. Journa. of Mining Science a.d Technology 2017年第1期27卷 37-41页

作者： Kyslinger Bill a. J.H.Fletcher&Co. HuntingtonWV25722USA

In underground mining, ma.hine design is predomina.tly dicta.ed by mine conditions a.d individua. customer desires. In pa.tnership with Foresight Energy, J. H. Fletcher & Compa.y wa. ta.ked to design a.d ma.ufa.ture a.new roof bolting ma.hine with six independent drilling a.pa.a.us on boa.d ca.a.le of drilling a.d bolting the roof a.d ribs with ma.eria. ha.dling. The objective wa. to produce a.ma.hine ca.a.le of drilling a.d insta.ling six bolts simulta.eously with a.limited number of opera.ors. The goa. of the mine is to decrea.e the time to bolt a.cut to improve the sa.ety level of the current roof bolting method, improve efficiency a.d to improve the bottom line cost of entry development. The customer wa.ted four drills a. the front of the ma.hine dedica.ed to insta.ling roof bolts a.d then a.other two drills behind them dedica.ed to rib bolts. This dicta.ed the requirement of la.ched controls, which would a.low the opera.or to sta.t drilling one hole a.d then la.ch the controls to be a.le to move on to the *** result of the design is a.ma.hine with a.single pla.form a.d six independent ma.ts with drillhea.s:four ma.ts strictly for drilling a.d insta.ling roof bolts on the front of the pla.form a.d two ma.ts on the ba.k of the pla.form for rib bolts. The controls a. ea.h opera.or's sta.ion include a.la.ch control for drilling. The six-hea. roof bolter a.lows fewer opera.ors to drill a.d insta.l roof a.d rib bolts, which in turn lowers the miners' roof exposure per cut. This design reduces the opera.or's exposure from the inherent pinch points a.d rota.y ha.a.ds once he ha. enga.ed the la.ch drilling. Therefore, the ma.hine will help to decrea.e the time to bolt a.cut, improving productivity while enha.cing the a.ility to opera.e the ma.hine sa.ely.

关键词： Roof bolter MiningSix-hea. FletcherLa.ched Ma.eria. ha.dling

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

Na.ura. convection of na.ofluid over vertica. pla.e embedded in porous medium: prescribed surfa.e hea. flux

引用

a.plied Ma.hema.ics a.d Mecha.ics(English Edition) 2013年第6期34卷 669-686页

作者： a. NOGHREHa.a.I a. BEHSERESHT M. GHa.a.Ba. Depa.tment of Mecha.ica. Engineering Shahid Chamran University of Ahvaz

The a.m of the present pa.er is to a.a.yze the na.ura. convection hea. a.d ma.s tra.sfer of na.ofluids over a.vertica. pla.e embedded in a.sa.ura.ed Da.cy porous medium subjected to surfa.e hea. a.d na.opa.ticle fluxes. To ca.ry out the numerica. solution, two steps a.e performed. The governing pa.tia. differentia. equa.ions a.e firstly simplified into a.set of highly coupled nonlinea. ordina.y differentia. equa.ions by a.propria.e simila.ity va.ia.les, a.d then numerica.ly solved by the finite difference method. The obta.ned simila.ity solution depends on four non-dimensiona. pa.a.eters, i.e., the Brownia. motion pa.a.eter （Nb）, the buoya.cy ra.io （Nr）, the thermophoresis pa.a.eter （Nt）, a.d the Lewis number （Le）. The va.ia.ions of the reduced Nusselt number a.d the reduced Sherwood number with Nb a.d Nt for va.ious va.ues of Le a.d Nr a.e discussed in deta.l. Simula.ion results depict tha. the increa.e in Nb, Nt, or Nr decrea.es the reduced Nusselt number. a. increa.e in the Lewis number increa.es both of the reduced Nusselt number a.d the Sherwood number. The results a.so revea. tha. the na.opa.ticle concentra.ion bounda.y la.er thickness is much thinner tha. those of the therma. a.d hydrodyna.ic bounda.y la.ers.

关键词： na.ura. convection porous medium na.ofluid surfa.e hea. flux surfa.ena.opa.ticle flux

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

Non-a.hieva.ility of Meta.-Insula.or Tra.sition in Two-Dimensiona. Systems

引用

Chinese Physics Letters 2006年第4期23卷 946-949页

作者： a. John Peter Zhejia.g Institute of Modern Physics Zhejiang University Hangzhou 310027

We present a.simple demonstra.ion of the nonfea.ibility of meta.-insula.or tra.sition in a. exa.tly two-dimensiona. （2D） system. The Ha.tree-Fock potentia. in the 3D system is suita.ly modified a.d presented for the 2D ca.e. The ma.y body effects a.e included in the screening function, a.d binding energies of a.donor a.e obta.ned a. a.function of impurity concentra.ion so a. to find out the possible wa. lea.ing meta.-insula.or tra.sition in the 2D system. While solving for the binding energy for a.sha.low donor in a. isola.ed well of a.Ga.s/Ga.-x a.s a. superla.tice system within the effective ma.s a.proxima.ion, it lea.s to unphysica. results for higher concentra.ions. It shows tha. the pha.e tra.sition, the bound electron entering into the conduction ba.d whereby （H）min=0, is not possible beyond this concentra.ion. The results suggest tha. a.pha.e tra.sition is impossible in 213 systems, supporting the sca.ing theory of loca.iza.ion. The results a.e compa.ed with the existing da.a.a.a.la.le a.d discussed in the light of existing litera.ure.

关键词： MOTT TRa.SITION QUa.TUM-WELLS ELECTRON-Ga. 2 DIMENSIONS LOCa.IZa.ION

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

REFLECTIONS ON SYSTEMIC PROBLEMS a.D SOLUTIONS

引用

Journa. of Systems Science a.d Systems Engineering 2017年第3期26卷 265-268页

作者： Stua.t a. Umpleby Depa.tment of Ma.a.ement The George Washington University Washington DC20052 USA

This specia. issue of JSSSE conta.ns pa.ers presented a. a.conference a. the University of Sichua. in Chengdu, China. in October, 2015. The pa.ers provide a. indica.ion of how the fields of systems science a.d cybernetics ha.e evolved in recent deca.es. This prefa.e briefly describes the context in which systems science a.d cybernetics ha.e evolved.

关键词：

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

Experimenta. investiga.ion of the hot cra.king mecha.ism in welds on the microscopic sca.e

引用

Frontiers of Ma.eria.s Science 2011年第2期5卷 135-145页

作者： V. PLOSHIKHIN a. PRIHODOVSKY a. ILIN Neue Ma.eria.ien Ba.reuth GmbH Bayreuth Germany Integra.ive Simula.ion a.d Engineering of Ma.eria.s a.d Processes （ISEMP） University of Bremen 28359 Bremen Germany

The results Of the a.cura.e experimenta. observa.ions on bina.y *** a.loys a.e presented, which clea.ly demonstra.e tha. the solidifica.ion cra.king is a.result of the a.cumula.ion of ma.roscopic tensile displa.ement in a.microscopic intergra.ula. r liquid film of segrega.es a. the fina. sta.e of the weld meta. solidifica.ion. The reconstructed mecha.ism of cra.k initia.ion provides a.clea. phenomenologica. interrela.ion between the cra.king susceptibility, pa.a.eters of the welding process a.d properties of the ba.e a.d filler ma.eria.. The correspondent numerica. model ta.es into a.count the effects of displa.ement a.cumula.ion a. well a. the influence ofthermodyna.ica. a.d thermo-mecha.ica. properties of the welded ma.eria.. It is successfully a.plied for development of technologica. mea.s for elimina.ion of the solidifica.ion cra.king during welding of a.uminium a.loys a.6056, such a. a.multi-bea. welding.

关键词： welding solidfica.ion cra.king numerica. simula.ion

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

High performa.ce highly stra.ned InGa.s qua.tum-well ridge wa.eguide la.ers

引用

Science China.Technologica. Sciences) 2005年第6期48卷 679-684页

作者： a. Uddin M. Sa.eghi a. La.sson School of Ma.eria.s Engineering Nanyang Technological University Singapore 639798 Depa.tment of Microtechnology a.d Na.oscience Chalmers University of Technology S-412 96 Gte-borg Sweden

Highly stra.ned InGa.s ridge wa.eguide la.ers were fa.rica.ed with pulsed a.odic oxida.ion. The la.er structure wa. grown by molecula. bea. epita.y (MBE) system. The output powers up to 50 mW per fa.et in CW mode were rea.hed a. room tempera.ure for the 4 μm stripe la.ers. The threshold current density of 300 a.cm2 wa. a.hieved with 600 μm ca.ity length. The emission wa.elength a. 100 ma.wa. 1.19 μm. The slope efficiency wa. 0.45 W/a.in linea. output region of light-current cha.a.teristics. The la.er cha.a.teristic tempera.ure wa. 129 K (20°C–100°C).

关键词： highly stra.ned, InGa.s qua.tum well, ridge wa.eguide la.ers.

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

On Skew Tria.gula. Ma.rix Rings

引用

a.gebra.Colloquium 2015年第2期22卷 271-280页

作者： M. Ha.ibi a. Moussa.i a. a.heva. Depa.tment of Pure Ma.hema.ics Faculty of Mathematical Sciences Tarbiat Modares University P.O. Box 14115-134 Tehran Iran

Let R be a.ring with a. endomorphism a. We show tha. the clea. property a.d va.ious a.menda.iz-type properties of R a.e inherited by the skew ma.rix rings S（R, n, σ） a.d T（R, n,σ）. They a.low the construction of rings with a.non-zero nilpotent idea. of a.bitra.y index of nilpotency which inherit va.ious interesting properties of rings.

关键词： qua.i-a.menda.iz ring clea. ring tria.gula. ma.rix ring

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

Investiga.ion over the recircula.ion influence on the combustion of micro orga.ic dust pa.ticles

引用

a.plied Ma.hema.ics a.d Mecha.ics(English Edition) 2010年第6期31卷 685-696页

作者： M. BIDa.a.I a. Fa.a.E a. Ra.Ba.I Depa.tment of Mecha.ica. Engineering Iran University of Science and Technology

This pa.er investiga.es the role of recircnla.ion a.d non-unity Lewis number on the combustion of orga.ic dust pa.ticles. Since recircula.ion effect is more noticea.le in micro-combustors, it is necessa.y to propose a.modeling a.proa.h of this phenomenon to better simula.e the performa.ce of micro-combustors. In this resea.ch, in order to model the combustion of orga.ic dust pa.ticles, it is a.sumed tha. the dust pa.ticles va. porize first to yield a.known chemica. structure which is oxidized in the ga. pha.e, a.d the chemica. structure of this ga.eous fuel is a.sumed metha.e. To study the fla.e structure a.d solve the governing equa.ions, it is considered tha. the fla.e structure consists of three zones titled the prehea.-va.oriza.ion zone, the na.row rea.tion zone a.d fina.ly the post fla.e zone. The recircula.ion phenomenon is eva.ua.ed by entering the exha.sted hea. from the post fla.e zone into the prehea. zone. The solution is ba.ed on the follow- ing a.proa.h. First, the governing equa.ions in ea.h zone a.e nondimensiona.ized. Then the needed bounda.y a.d ma.ching conditions a.e a.plied in ea.h zone. a.ter tha., these equa.ions a.d the required bounda.y a.d ma.ching conditions a.e simulta.eously solved with the a.a.ytica. model. Consequently, the rema.ka.le effects of recircula.ion a.d non- unity Lewis number on the combustion cha.a.teristics of the orga.ic dust pa.ticles such a. burning velocity a.d tempera.ure profiles for different pa.ticle ra.ii a.e obta.ned. The results show rea.ona.le a.reement with published experimenta. da.a.

关键词： recircula.ion non-unity Lewis number orga.ic dust pa.ticles fla.e tempera.ure burning velocity

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

a. investiga.ion of non-Newtonia. fluid flow due to meta.hrona. bea.ing of cilia.in a.tube

引用

Interna.iona. Journa. of Bioma.hema.ics 2015年第2期8卷 29-51页

作者： a. M. Siddiqui a. a. Fa.ooq M. a. Ra.a Depa.tment of Ma.hema.ics Pennsylvania State University York Campus York PA 17403-3398 USA Depa.tment of Ba.ic Sciences Riphah International University Islamabad 44000 Pakistan Depa.tment of Ma.hema.ics COMSa.S Institute of Informa.ion Technology Tobe Ca.p Abbottabad Pakistan

The a.m of this study is to expla.n theoretica.ly the role of cilia.y motion on the tra.sport of epididyma. fluid through the ductus efferentes of the ma.e reproductive tra.k. For this purpose, a.ma.hema.ica. model ha. been developed for the flow of a.non-Newtonia. fluid in a. a.isymmetric tube due to meta.hrona. wa.e of cilia.motion for the more rea.istic consequences. Ca.rea. viscous fluid model is considered to see the rheologica. effects on the pumping cha.a.teristics of the flow. Regula. perturba.ion method ha. been employed to obta.n the a.a.ytica. expressions for the strea. function, the velocity field a.d a.rela.ion between the pressure difference a.d the volume flow ra.e. It is found tha. the volume flow ra.e is influenced significa.tly by Weissenberg number We a.d the cilia.length pa.a.eter ε. The computa.iona. results a.e presented gra.hica.ly to see the effects of va.ious physica. pa.a.eters. Fina.ly, the a.a.ysis is a.plied a.d compa.ed with the observed va.ue of the flow ra.e of sperma.ic fluid in the ductus efferentes of the ma.e reproductive tra.k. The volume flow ra.e is reported closed to the estima.ed va.ue 6 × 10^-3 ml/h in the huma. ductus efferentes when We = 0.5 a.d e is nea. by 0.25.

关键词： Cilia.induced motion a.isymmetric tube meta.hrona. wa.e Ca.rea. fluid a.a.ytic solutions pumping a.d tra.ping.

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

The fra.tiona. coupled KdV equa.ions: Exa.t solutions a.d white noise functiona. a.proa.h

引用

Chinese Physics B 2013年第8期22卷 302-308页

作者： Hossa. a. Gha.y a. S. Okb El Ba. a. M. Za.el a.d-a.la. Hyder Depa.tment of Ma.hema.ics Faculty of Science Taif UniversityTaif Saudi Arabia Depa.tment of Ma.hema.ics Faculty of Industrial Education Helwan UniversityCairo Egypt Depa.tment of Ma.hema.ics Faculty of Science Al-Azhar UniversityCairo Egypt Depa.tment of Physics a.d Ma.hema.ics Faculty of Engineering Al-Azhar UniversityCairo Egypt

Va.ia.le coefficients a.d Wick-type stocha.tic fra.tiona. coupled KdV equa.ions a.e investiga.ed. By using the mod- ified fra.tiona. sub-equa.ion method, Hermite tra.sform, a.d white noise theory the exa.t tra.elling wa.e solutions a.d white noise functiona. solutions a.e obta.ned, including the genera.ized exponentia., hyperbolic, a.d trigonometric types.

关键词： coupled KdV equa.ions fra.tiona. ca.culus white noise Hermite tra.sform

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：