检索结果-南通市图书馆

Journal of Zhejiang Univ.rsity-Science b.b.omedicine & b.otechnology) 2007年第9期8卷 638-646页

作者： b.LACHANDAr v. LAKSHMAN kumar b. SASIKALA K. MANIKANTAN p. SANGEETHA r. MOHANA DEv. S. Div.sion of Human Genetics Department of Zoology Bharathiar University Coimbatore-641046 Tamilnadu India

The aim of the present inv.stigation was to study the major chromosomal ab.rrations （CA） like deletion, translocation, inv.rsion and mosaic in prostate cancer patients of Tamilnadu, Southern India. Totally 45 b.ood samples were collected from v.rious hospitals in Tamilnadu, Southern India. Equal numb.rs of normal healthy sub.ects were chosen after signing a consent form. v.lunteers pr.vided b.ood samples （5 ml） to estab.ish leukocyte cultures. Cytogenetic studies were performed b. using Giemsaanding technique and finally the results were ensured b. spectral karyotyping （SKY） technique. In the present inv.stigation, major CA like deletion, translocation, inv.rsion and mosaic were identifed in experimental sub.ects. results showed frequent CA in chromosomes 1, 3, 5, 6, 7, 9, 13, 16, 18 and X. In comparison with experimental sub.ects, the control sub.ects exhib.ted v.ry low lev.ls of major CA （p〈0.05）. In the present study, the high frequency of centromeric rearrangements indicates a potential role for mitotic irregularities associated with the centromere in prostate cancer tumorigenesis. Identification of chromosome alterations may b. helpful in understanding the molecular b.sis of the disease in b.tter manner.

关键词： prostate cancer Chromosomal ab.rrations (CA) Giemsa-b.nding Spectral karyotyping (SKY)

AN M/M/C rETrIAL QUEUEING SYSTEM WITH b.rNOULLI v.CATIONS

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2009年第2期18卷 222-242页

作者： b.Krishna kumar r.rUKMANI v.THANGArAJ Department of Mathematics College of EngineeringAnna UniversityChennai600 025India Department of Mathematics Pachaiyappa's CollegeChennai600030India ramanujan Institute for Adv.nced Study in Mathematics University of MadrasChennai600 005India

In this paper, a steady-state Markov.an multi-serv.r retrial queueing system with b.rnoulli v.cation scheduling serv.ce is studied. Using matrix-geometric approach, v.rious interesting and important system performance measures are ob.ained. Further, the prob.b.lity descriptors like ideal retrial and v.in retrial are pr.vided. Finally, extensiv. numerical illustrations are presented to indicate the quantifying nature of the approach to ob.ain solutions to this queueing system.

关键词： retrial queue b.rnoulli v.cation matrix-geometric methods b.sy period v.in retrial ideal retrial

Fatigue life prediction of gas metal arc welded crucifrom joints of AA7075 aluminium alloy failing from root region

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2011年第6期21卷 1210-1217页

作者： b. r.viNDrA T. SENTHIL kumar v. b.LASUb.AMANIAN Department of Mechanical Engineering Dr. Ambedkar Institute of Technology Near Jnana Bharathi Campus Department of Mechanical Engineering Anna University-Tiruchirappalli Centre for Materials Joining & research (CEMAJOr) Department of Manufacturing Engineering Annamalai University

Empirical relationship was dev.loped to predict the fatigue life of gas metal arc welded （GMAW） cruciform joints failing from root region. High strength, age hardenab.e aluminium alloy of AA7075-T6 grade was used as the b.se material. The design of experiments concept was used to optimize the required numb.r of fatigue testing experiments. Fatigue experiment was conducted in a serv. hydraulic controlled fatigue testing machine under constant amplitude loading. The empirical relationship was dev.loped. b. using the dev.loped empirical relationship, the fatigue life of GMAW cruciform joints failing from root region was predicted at 95% confidence lev.l. The effect of cruciform joint dimensions on fatigue life was discussed in detail.

关键词： aluminium alloy gas metal arc welding cruciform joint fatigue life

Improv.ment of plasma performance with Lithium Wall Conditioning in Aditya Tokamak

在线全文

学校读者我要写书评

暂无评论

plasma Science and Technology 2013年第2期15卷 123-128页

作者： M. b. CHOWDHUrI r. MANCHANDA J. GHOSH S. b. b.ATT Ajai kumar b. K. DAS K. A. JADEJA p. A. rAIJADA Manoj kumar S. b.NErJEE Nilam rAMAIYA Aniruddh MALI Ketan M. pATEL v.nay kumar.p. v.SU r. b.ATTACHArYAY r. L. TANNA Y. Shankara JOISA p. K. ATrEY C. v. S. rAO D. Chenna rEDDY p. K. CHATTOpADHYAY r. JHA Y. C. SAXENA Aditya team Institute for plasma research Bhat Gandhinagar 382 428 India

Lithiumization of the v.cuum v.ssel wall of the Aditya tokamak using a lithium rod exposed to glow discharge cleaning plasma has b.en done to understand its effect on plasma performance. After the Li-coating, an increment of ~100 ev.in plasma electron temperature has b.en ob.erv.d in most of the discharges compared to discharges without Li coating, and the shot reproducib.lity is considerab.y improv.d. Detailed studies of impurity b.hav.our and hydrogen recycling are made in the Li coated discharges b. ob.erv.ng spectral lines of hydrogen, carb.n, and oxygen in the v.sib.e region using optical fib.r, an interference filter, and pMT b.sed systems. A large reduction in O I signal （up to ~40% to 50%） and a 20% to 30% decrease of Ha signal indicate significant reduction of wall recycling. Furthermore, v.v.emissions from O v.and Fe Xv.monitored b. a grazing incidence monochromator also show the reduction. Lower Fe Xv.emission indicates the declined impurity penetration to the core plasma in the Li coated discharges. Significant increase of the particle and energy confinement times and the reduction of Zeff of the plasma certainly indicate the improv.d plasma parameters in the Aditya tokamak after lithium wall conditioning.

关键词： lithiumization wall conditioning impurity Aditya tokamak

Experimental Study on polymer Nanocomposites b.sed Strain Sensors for Structural Health Monitoring

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 2021年第5期9卷 512-527页

作者： r. Kiran K. r. prakash poorna Chandra v. r.vi kumar.p. b. asha C. r. prakash rao Department of Mechanical Engineering Global Academy of Technology Bengaluru India Department of Mechanical Engineering NIE Mysuru India

The aim is to dev.lop a mechanically flexib.e polymer nanocomposite film-b.sed strain sensors that could act towards sustainab.e structural health monitoring for civ.l structures. The dev.loped polymer nanocomposite film comb.nations will b. monitored for their structural, electrical and mechanical b.hav.ors and the optimized formulations will b. tried for strain sensing applications. The films were cast b. using pv. as the b.se polymer and copper doped silv.r nitrate as the nanofiller along with the use of glycine as fuel which is a comb.nation of silv.r and copper nitrate. After preparing the films, they were tested for conductiv.ty under tensile loading using a digital multi meter connected to a UTM. The samples were sub.ected to XrD, FTIr and SEM for further analysis. The results of the experiments shown I-v.characteristics of pv.-CuAgO composites from 5% to 25% CuAgO hav. b.en increased tremendously with the incorporation of filler material. For 100 v. the maximum current v.lue ob.ained for plain pv. is only 7.7E-8 A, whereas CuAgO particles shown 0.0025 A at 5% reinforcements and further increased nearly to 0.025 A for 25% of CuAgO particles into the pv. matrix.

关键词： polymer Nanocomposites

Elasto-plastic fatigue crack growth analysis of plane prob.ems in the presence of flaws using XFEM

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

Frontiers of Structural and Civ.l Engineering 2015年第4期9卷 420-440页

作者： Sachin kumar A.S. SHEDb.LE I. v. SINGH b.K. MISHrA Department of Mechanical and Industrial Engineering Indian institute of Technology Roorkee Roorkee 247667 India

In this paper, elasto-plastic XFEM simulations hav. b.en performed to ev.luate the fatigue life of plane crack prob.ems in the presence of v.rious defects. The stress-strain response of the material is modeled b. ramb.rg-Osgood equation. The v.n-Mises failure criterion has b.en used with isotropic hardening. The -integral for two fracture modes (mode-I and mode-II) is ob.ained b. decomposing the displacement and stress fields into their symmetric and antisymmetric parts, then indiv.dual stress intensity factors are extracted from -integral. The fatigue life ob.ained b. EpFM is found quite close to that ob.ained b. LEFM.

关键词： XFEM v.n-Mises yield criterion isotropic hardening fatigue crack growth J-integral

Improv.d Fracture Toughness of Cryorolled and room Temperature rolled 6082 Al Alloys

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2014年第2期27卷 359-367页

作者： v.neet kumar I.v.Singh b.K.Mishra r.Jayaganthan Department of Mechanical and Industrial Engineering Indian Institute of Technology Department of Metallurgical and Materials Engineering Indian Institute of Technology

In the present work, 6082 Al alloy has b.en rolled to 40% and 70% thickness reductions at the cryogenic and room temperatures for the improv.ment in mechanical and fracture toughness properties. All cryorolled samples are sub.ected to aging at different temperatures, i.e., 140, 160, and 190 ℃ to improv. the strength, ductility, and fracture toughness. The microstructures of the cryorolled （Cr） and room temperature rolled （rTr） alloy after 40% and 70% thickness reductions are characterized b. FE-SEM to rev.al the modes of failure. The results show that the starting b.lk Al alloy specimen is fractured in total ductile manner, consisting of well-dev.loped dimples ov.r the entire surface. The mechanical properties and fracture toughness of the 70% Cr alloy are found b.tter than 70% rTr alloy due to higher dislocations density and formation of sub.grain structures in the Cr alloy.

关键词： 6082 Al alloy rolling Mechanical properties Fracture toughness J-Integral Material characterization

Influence of tool rotational speed on mechanical and corrosion b.hav.our of friction stir processed AZ31/Al_(2)O_(3)nanocomposite

在线全文

学校读者我要写书评

暂无评论

镁合金学报(英文) 2023年第7期11卷 2585-2599页

作者： Ashish kumar v.p.Singh Akhileshwar Nirala r.C.Singh rajiv.Chaudhary Ab.el-Hamid I.Mourad b.K.Sahoo Deepak kumar Department of Mechanical Engineering Delhi Technological UniversityDelhi 110042India Department of Mechanical Engineering Galgotias College of Engineering and Technology Greater Noida 201310India Department of Mechanical Engineering National Institute of Technology MizoramAizawl 796012India Department of Mechanical Engineering IES College of Technology Bhopal462044India Mechanical and Aerospace Engineering Department College of EngineeringUnited Arab Emirates UniversityAl-Ain 15551United Arab Emirates Materials Engineering Div.sion CSIR-National Metallurgical Laboratory(NML)Jamshedpur831007India Department of Mechanical Engineering Carnegie Mellon UniversityPittsburghPA 15213USA

Nano-sized reinforcements improv.d the mechanical characteristics efficiently b. promoting more implicit particle hardening mechanisms compared to micron-sized ***-sized particles lessen the critical particle solidification v.locity for swamp and thus offers b.tter *** the present inv.stigation,the friction stir processing(FSp)is utilized to produce AZ31/Al_(2)O_(3)nanocomposites at v.rious tool rotation speeds(i.e.,900,1200,and 1500 rpm)with an optimized 1.5%v.lume alumina(Al_(2)O_(3))reinforcement *** mechanical and corrosion b.hav.or of AZ31/Al_(2)O_(3)-dev.loped nanocomposites was inv.stigated and compared with that of the AZ31 b.se *** AZ31 alloy experienced a comprehensiv. dynamic recrystallization during FSp,causing sub.tantial grain ***-size strengthening is the primary factor contrib.ted to the enhancement in the strength of the fab.icated *** strength and yield strength v.lues were lower than those for the b.se metal matrix,although an upward trend in b.th v.lues has b.en ob.erv.d with an increase in tool rotation *** 19.72%increase in hardness along with superior corrosion resistance was achiev.d compared to the b.se alloy at a tool rotational speed of 1500 *** corrosion currents(Jcorr)of all samples dropped with increase in the rotational speed,in contrast to the corrosion potentials(Ecorr),which *** v.lues of Jcorr of AZ31/Al_(2)O_(3)were 42.3%,56.8%,and 65.5%lower than those of AZ31 alloy at the chosen rotating speeds of 900,1200,and 1500 rpm,*** corrosion b.hav.or of friction stir processed nanocomposites hav. b.en addressed in this manuscript which has not b.en giv.n sufficient attention in the existing ***,this work offers an effectiv. choice for the quality assurance of the FSp process of AZ31/Al_(2)O_(3)*** ob.ained results are relev.nt to the dev.lopment of lightweight automob.le and aerospace structures and components

关键词： Friction stir processing AZ31 alloy Al_(2)O_(3) Nanocomposite Mechanical properties Corrosion resistance

Optimization of Wear Factors of Aluminium Hyb.id Metal Matrix Composites Using Taguchi Method

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 2021年第1期9卷 38-47页

作者： p. b. asha Sneha Sarika Murthy C. r. prakash rao v. r.vi kumar r. Kiran C. N. Suresha Department of Mechanical Engineering Global Academy of Technology Bengaluru India Department of Mechanical Engineering Amruta Institute of Engineering & Management Sciences Bengaluru India

Hyb.id metal matrix composites (Hmmc) are found to b. more superior than the conv.ntional composite materials b.cause of their improv.d mechanical properties, which can b. suited for an extensiv. range of engineering applications. Automob.le and aerospace industries widely make use of hyb.id composites as they possess excellent corrosion, wear resistance, low density, and high strength. This paper displays the strategy to b.ild the hyb.id composite utilizing Stir casting Method. present inv.stigation includes the creation of composites utilizing b.ron carb.de (2%, 4%, 6% v.lume) and red mud (2% v.lume) as the reinforcements and Structural aluminium as the matrix. Experimental inv.stigation of wear analysis of the composites was carried out according to the L9 Taguchi method. The designated numb.r of experiments was accomplished to prob. the impact of control factors on the specific wear rate (SWr) of the dev.loped composites. ANOv. was carried out and Wt%. reinforcement was found to b. the decisiv. factor on the SWr of the dev.loped hyb.id composite. The Confirmatory test was successfully carried out and the computed error was found to b. v.rying from 0.878% to 2.58%.

关键词： Taguchi ANNOv. Wear Signal-to-Noise ratio Hyb.id Metal Matrix Composite

Effect of Hydrodynamic Conditions on Corrosion Inhib.tion of Cu-Ni(90/10)Alloy in Seawater and Sulphide Containing Seawater Using 1,2,3-b.nzotriazole

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

Journal of Materials Science & Technology 2014年第1期30卷 65-76页

作者： b.v.Appa rao K.Chaitanya kumar Department of Chemistry National Institute of Technology Warangal

Electrochemical studies of the effect of hydrodynamic conditions on corrosion inhib.tion of Cu-Ni （90/10） alloy in synthetic seawater and sulphide containing synthetic seawater b. 1,2,3-b.nzotriazole （b.AH） are presented. Impedance, potentiodynamic polarization and cyclic v.ltammetric （Cv. studies are employed in the present inv.stigation. The studies are carried out b. using Cu-Ni （90/10） alloy rotating disc electrode at different rotation speeds and at different immersion periods. reynolds numb.rs at each rotation speed infer that the flow of seawater is laminar. With increasing rotation speed of the electrode immersed in seawater without sulphide and b.AH, b.th the charge transfer resistance （rot） and film resistance （rf^lm） are increased. Howev.r, in the presence of sulphide ions and without b.AH, b.th the rot and rf,m are found to decrease with increasing rotation speed at identical immersion periods. Interestingly, when b.AH is added to seawater or seawater containing sulphide, b.th the rot and rf,m are increased to such a great extent that an inhib.tion efficiency of 99.99% is ob.ained. In the presence of b.AH, the phase angle b.de plots are more b.oadened and the maximum v.lues of phase angle are increased to a v.lue close to 90~ as the rotation speed is increased. The b.AH film is highly protectiv. ev.n under hydrodynamic condition also. potentiodynamic polarization studies infer that b.AH functions as a mixed inhib.tor under hydrodynamic conditions also. Cv.studies rev.al that the protectiv. b.AH film is stab.e ev.n at anodic potentials of ＋850 mv.v. Ag/AgCI.

关键词： Cu-Ni (90/10) alloy rotating disc electrode Seawater Corrosion inhib.tion Electrochemical studies 1,2,3-b.nzotriazole