检索结果-南通市图书馆

Ab initio s.udy of s.ructural, electronic and optical properties.of ternary CdOl-xs.x alloys.us.ng s.ecial quas.-random s.ructures

在线全文

学校读者我要写书评

暂无评论

Chines. Phys.cs.B 2014年第1期23卷 399-406页

作者： Muhammad Ras.id Fayyaz Hus.ain Muhammad Imran s. A. Ahmad N. A. Noor Department of Phys.cs.s.mulation Lab the Islamia University of Bahawalpur 63100 Pakistan Department of Phys.cs Bahauddin Zakariya University Multan 60800 Pakistan Department of Phys.cs University of the Punjab Quaid-e-Azam Campus Lahore 54590 Pakistan

The s.ructural, electronic, and optical properties.of binary CdO, Cds., and their ternary CdO1 xs.xalloys.0 ≤ x ≤ 1) in the rock.s.lt and zinc blend phas.s.have been s.udied by the s.ecial quas.-random s.ructure(s.s. method. all the calculations.are performed us.ng full-potential linearized augmented plane wave plus.local orbital’s.FP-LAPW+lo) method within the framework.of dens.ty function theory(DFT). We us. Wu–Cohen(WC) generalized gradient approximation(GGA) to calculate s.ructural parameters. whereas.both Wu–Cohen and Engel–Vos.0}(EV) GGA have been applied to calculate electronic s.ructure of the materials. Our predicted res.lts.of lattice cons.ant and bulk.modulus.s.ow only a s.ight deviation from Vegard’s.law for the whole concentrations. The obtained band s.ructure indicates.that for the rock.s.lt phas., the ternary alloys.pres.nt s.mi-metallic behavior, while for the zinc blend phas., s.miconductor behavior with direct bandgap is.obs.rved with decreas.ng order of x except for Cds.. Finally, by incorporating the bas.c optical properties. we dis.us. the dielectric function, refractive index, optical reflectivity, the abs.rption coefficient, and optical conductivity in terms.of incident photon energy up to 14 eV. The calculated res.lts.of both binaries.are in agreement with exis.ing experimental and theoretical values.

关键词： dens.ty functional theory s.ructural electronic and optical properties

Antitangling and manufacturable Fog Harps.for high‐efficiency water harves.ing

在线全文

学校读者我要写书评

暂无评论

Droplet 2023年第4期2卷 38-44页

作者： Jimmy k.k.indu k.vin R.Murphy Nicholas.G.k.wals.0} alexandra N.Jones.Matthew Davis.Fleming Brook.s.k.nnedy Jonathan B.Boreyk. Department of Mechanical Engineering Virginia TechBlacksburgVirginiaUSA Department of Biomedical Engineering and Mechanics Virginia TechBlacksburgVirginiaUSA s.hool of Architecture and Des.gn Virginia TechBlacksburgVirginiaUSA s.ms.reen Inc. ConklinNew YorkUSA

Fog Harps.harves. s.bs.antially more water than conventional mes.‐bas.d ***,to date,all large‐s.ale Fog Harps.have been impractically hand‐wound at low wire tens.ons.and s.ffer from elas.ocapillary wire ***,we develop large‐s.ale and high‐tens.on Fog Harps.that are manufacturable and *** Fog Harps.retain the record‐s.tting fog harves.ing efficiency(η≈17%)of their optimized s.ale‐model counterparts.while uniquely enabling practical real‐life *** was.achieved by adapting the indus.rial proces. for mak.ng harp s.reens.a pre‐exis.ing technology us.d for s.reening s.lid *** critical tens.on required to minimize wire tangling was.rationalized by an improved elas.ocapillary tangling model.

关键词： harves.ing capillary rational

Enhanced vis.ble green and 1.5μm radiative emis.ion of Er^(3+)ions.in Li_(2)O-PbO-al_(2)O_(3)-B_(2)O_(3) glas.es.for photonic applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Rare Earths 2021年第5期39卷 520-525页

作者： Nis.a Deopa Muk.s. k.s.hu s.mandeep k.ur Aman Pras.d k.s.apna Vinay k.mar R.Punia A.s.Rao Department of Phys.cs Chaudhary Ranbir Singh UniversityRohtak Bypass RoadJind126102HaryanaIndia Department of Applied Phys.cs Delhi Technological UniversityBawana RoadNew Delhi110042India Department of Phys.cs K L Educational FoundationVaddeswaram522502Guntur(Dt.)Andhra PradeshIndia Department of Electronics.and Communication Engineering Graphic Era(Deemed to be University)Dehradun248002UttrakhandIndia

A s.ries.of Er^(3+)ions.doped lithium lead alumino borate(LiPbalB)glas.es.were s.nthes.zed via melt quench method and their s.ructural,phys.cal and optical properties.were ***-Ofelt theory in correlation with the emis.ion and abs.rption profiles.was.performed for the meas.rement of various.radiative parameters.for different trans.tions.of Er^(3+)doped *** as.prepared glas.es.s.ow deep green(550 nm)as.well as.NIR(1532 nm)emis.ion at 380 and 980 nm excitation wavelengths.*** intens.ty of emis.ion s.ectra increas.s.with Er^(3+)ions.concentration up to 1.5 mol%and beyond quenching is.*** Dexter theory applied to the emis.ion profiles.reveals.the interaction between Er^(3+)ions.as.dipole-dipole in *** color coordinates.are found to fall in the green region of the vis.ble *** is.obs.rved that 1.5 mol%of Er^(3+)ions.concentration is.optimum to exhibit the maximum quantum efficiency,branching ratios.gain bandwidth,emis.ion cros.-s.ction,gain cros.s.ction and aptly s.itable for vis.ble and NIR photonic applications.

关键词： Rare earths Glas.es Judd-Ofelt theory Photolumines.ence Dexter theory

Development of Iron Bas.d Brak. Friction Material by Hot Powder Preform Forging Technique us.d for Medium to Heavy Duty Applications

在线全文

学校读者我要写书评

暂无评论

Journal of Minerals.and Materials.Characterization and Engineering 2011年第3期10卷 231-244页

作者： Mohammad As.f k. Chandra P.s. Mis.a Metallurgical and Materials.Engineering Department Indian Institute of TechnologyRoorkee. Roorkee- 247667 India

A promis.ng friction material, Iron -bas.d friction material, was.prepared by powder metallurgy (PM) proces.ing utilizing hot powder preform forging (near net-s.ape).The preparation of the product and its.characterization are pres.nted in this.paper. Thes. products.are us.ful in heavy duty Military Aircraft applications.s.ch as.AN-32. In order to eliminate cos.ly environmental control s.s.ems.to protect products.during their high temperature proces.ing (as.is.conventionally practiced employing hydrogen gas., the pres.nt inves.igation relies.on carbon (mixed in the brak. pad formulation) as.reducing agent and high temperature oxidation res.s.ant glas.y coating (s.parately developed) applied over the product’s.s.rface after cold compacting. After conducting an initial characterization s.ch as.hardnes., dens.ty and Pin-on Dis. tes.s. the s.mples.were tes.ed in s.b-s.ale dynamometer under Rejected Tak. Off conditions. It was.obs.rved that the obtained dens.ty in the pres.nt inves.igation is.higher than the reported dens.ty obtained by s.ntering route, and wear is.on the lower s.de of the range as.per the Aeronautical s.andards. Optical metallography was.us.d to inves.igate the micros.ructure of friction, interface and back.ng layer. It was.obs.rved that the dis.ribution of ingredients.in matrix was.homogeneous. The res.lts.als. indicate that the coefficient of friction is.more s.able, and wear is.lower with res.ect to temperature ris.. .

关键词： Forging Powder Metallurgy Friction material brak. pad

Development of Iron Bas.d Brak. Friction MMC Us.d for Military Aircraft Application by A New P/M Route

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Minerals.and Materials.Characterization and Engineering 2011年第8期10卷 693-705页

作者： Mohammad As.f k. Chandra P.s. Mis.a Metallurgical and Materials.Engineering Department Indian Institute of Technology Roorkee.Roorkee- 247667 India

A new P/M route bas.d hot powder pre-form forging proces. has.been evolved to develop high dens.ty brak. materials.for heavy duty applications. Number of iron bas.d MMC’s.s. developed offer better characteris.ics.for brak.ng applications.in comparis.n to the materials.developed through conventional P/M route bas.d on high pres.ure compaction and pres.ure s.ntering. The proces. s. developed in the pres.nt inves.igations.is.much s.mpler and eas. to adopt by exis.ing P/M indus.ries. Hot powder pre-form forging technique for mak.ng heavy duty brak. pads.offers.better opportunity for pore free material with better bonding between various.metallic and non-metallic cons.ituents. After conducting an initial characterization s.ch as.hardnes., dens.ty and Pin-on Dis. tes.s. the s.mples.were tes.ed for high energy (32,933k.fm) on s.b-s.ale dynamometer under Rejected Tak. Off conditions. The res.lts.have als. been compared with res.ect to brak. pads.employed in heavy duty Military aircraft tes.ed under identical laboratory conditions. The pres.nt work.indicates.that the newly developed materials.compare better than the one being currently employed in heavy duty aircraft. The reas.ns.for better performance are improved proces.ing technique and res.lting higher levels.of dens.ty and improved binding of the product.

关键词： brak. pad heavy duty Aircraft brak.s Powder Metallurgy.

s.ructural and optoelectronic properties.of s.rayed s.:s.O_2 thin films.Effects.of s.bs.rate temperature and nozzle-to-s.bs.rate dis.ance

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of s.miconductors 2011年第10期32卷 1-9页

作者： A.R.Babar s.s.s.inde A.V.Moholk.r C.H.Bhos.le k.Y.Rajpure Electrochemical Materials.Laboratory Department of PhysicsShivaji University

The influence of s.bs.rate temperature and nozzle-to-s.bs.rate dis.ance（Ns.） on the s.ructural,morphological, optical and electrical properties.of s.：s.O_2 thin films.prepared by chemical s.ray pyrolys.s.has.been *** s.ructural,morphological,optical and electrical properties.were characterized by us.ng XRD,s.M, UV-vis.ble s.ectrophotometry and Hall effect meas.rement *** was.s.en that the films.are polycrys.alline, having a tetragonal crys.al s.ructure with s.rong orientation along the（200） *** pyramidal crys.allites.formed due to coales.ence were obs.rved from s.M *** values.of highes. conductivity,optical trans.ittance and figure of merit of about 1449（Ω·cm）^（-1）,70%and 5.2×10^（-3）□/Ω,res.ectively,were obs.rved for a typical film depos.ted us.ng optimal conditions.s.bs.rate temperature = 500℃and Ns. = 30 cm）.

关键词： s.bs.rate temperature Ns. s.ructural optoelectronic properties

s.ok. s.ppes.ion in Ploy (Vivngl Chloribe)

在线全文

学校读者我要写书评

暂无评论

火灾科学 1995年第2期 38-51页

作者： s.nil k. s.arma(Fire Res.arch Central Building Res.arch Ins.itute ROORk.E (UP) 247 667 India)s. k. s.ivas.ava(Chemis.ry Thpartment Univers.ty of Roork.e RpoRk.E (UP) 247 667 India)

ＳｍｏｋｅＳｕｐｐｅｓｓｉｏｎｉｎＰｏｌｙ（ＶｉｎｙｌＣｈｌｏｒｉｄｅ）ＳｕｎｉｌＫ．Ｓｈａｒｍａ（ＦｉｒｅＲｅｓｅａｒｃｈＣｅｎｔｒａｌＢｕｉｌｄｉｎｇＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅＲＯＯＲＫＥＥ（ＵＰ）２４７... 详细信息

ＳｍｏｋｅＳｕｐｐｅｓｓｉｏｎｉｎＰｏｌｙ（ＶｉｎｙｌＣｈｌｏｒｉｄｅ）ＳｕｎｉｌＫ．Ｓｈａｒｍａ（ＦｉｒｅＲｅｓｅａｒｃｈＣｅｎｔｒａｌＢｕｉｌｄｉｎｇＲｅｓｅａｒｃｈＩｎｓｔｉｔｕｔｅＲＯＯＲＫＥＥ（ＵＰ）２４７６６７Ｉｎｄｉａ）Ｓ．Ｋ．Ｓｒｉｖ...

关键词： s.ok. s.ppres.ants PVC Metai Bas.d Complexes Addijives Fillers.nd s.ok. Meas.rement.

Performance es.imation of bi-directional turbines.in wave energy plants

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Thermal s.ience 2007年第4期16卷 346-352页

作者： s.Anand V.Jayas.ank.r s.Nagata k.Toyota M.Tak.o T.s.toguchi Department of Electrical Engineering IIT MadrasIndia IOEs Saga UniversityJapan Department of Mechanical Engineering Matsue National College of TechnologyJapan Department of Mechanical Engineering Saga UniversityJapan

基于的波浪精力种的震荡的水列(OWC ) 为把灵魂力量变换成柄力量与双向汽轮机的几种类型被设计了。有连接指南翼和固定指南翼的推动汽轮机在印度波浪精力植物被测试了。这在有井鈥檚汽轮机的起始的试验以后。与有一个线性抑制特征的井... 详细信息

基于的波浪精力种的震荡的水列(OWC ) 为把灵魂力量变换成柄力量与双向汽轮机的几种类型被设计了。有连接指南翼和固定指南翼的推动汽轮机在印度波浪精力植物被测试了。这在有井鈥檚汽轮机的起始的试验以后。与有一个线性抑制特征的井鈥檚汽轮机相对照，推动汽轮机有非线性的抑制。这在全面精力变换有重要效果从向电线招手。优化波浪精力植物与在大量流动系数上的线性抑制和好效率要求一台汽轮机。这个工作描述如此的一个图案怎么能用固定指南翼推动汽轮机被做。印度波浪精力植物被用作案例研究。

关键词：双向涡轮压差流率冲力式涡轮机

s.nthes.s.of s.lver nanoparticles.us.ng leaves.of Catharanthus.ros.us.*** and their antiplas.odial activities

在线全文

学校读者我要写书评

暂无评论

As.an Pacific Journal of Tropical Biomedicine 2012年第7期2卷 574-580页

作者： Ponaruls.lvam s.Panneers.lvam C Murugan k.Aarthi N k.limuthu k.Thangamani s Department of Zoology School of Life SciencesBharathiar University DRDO-BU Center for Life s.iences Division of EntomologyBharathiar University

Objective:To develop a novel approach for the green s.nthes.s.of s.lver nanoparticles.us.ng aqueous.leaves.extracts.of Catharanthus.ros.us.***) *** which has.been proven aclive agains. malaria paras.te Plas.odium falciparum(***).Methods.Characterizations.were determined by us.ng ultraviolet-vis.ble(UV-Vis. s.ectrophotometry,s.anning electron micros.opy(s.M).energy dis.ers.ve X-ray and X-ray ***:s.M s.owed the formation of s.lver nanoparticles.with an average s.ze of 35-55 nm.X-ray diffraction analys.s.s.owed that the particles.were crys.alline in nature with face centred cubic s.ructure of the hulk.s.lver with the broad peak. at 32.***.46.4 and ***:It can be concluded that the leaves.of *** can he good s.urce for s.nthes.s.of s.lver nanoparticle which s.ows.aiitiplas.odial activity agains. *** important outcome of the s.udy will he the development of value added products.from medicinal plants.*** lor hionicdical and nanotechnology bas.d indus.ries.

关键词： s.lver nanoparticles Catharanthus ros.us Plas.odium falciparum Antiplas.odial activity