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Optimization.of Stren.th Properties of Reactive Powder Con.rete by Respon.e Surface Methodology

Journ.l of Shan.hai Jiaoton. un.versity(Scien.e) 2024年第5期29卷 900-908页

作者： SAKtHIESWARAn.n. MOORtHY n. REn.SHA M. CHIn.ADURAI M. Departmen. of Civil En.in.erin. E.G.S.Pillay Engineering CollegeNagapattinam611002TamilnaduIndia Departmen. of Scien.e an. Human.ties E.G.S.Pillay Engineering CollegeNagapattinam611002TamilnaduIndia Departmen. of Computer Scien.e an. En.in.erin. E.G.S.Pillay Engineering CollegeNagapattinam611002TamilnaduIndia

the main.objective of this study is to optimize the fresh an. stren.th properties of reactive powder con.rete in.orporated with in.ustrial by-products like ultra-fin. groun. gran.lated blast furn.ce slag as cemen. substitute an. added with coal bottom ash an. recycled con.rete fin.s as partial replacemen. of quartz san. by respon.e surface methodology through design.of experimen. *** four respon.es n.mely slump,compressive stren.th(C-28),flexural stren.th(F-28),an. split-ten.ile stren.th(S-28)after 28 days of curin. period were *** statistical study on.the reactive powder con.rete in.ludes the modelin. of regression.n.rmal probability plots,surface plot an.lysis,an. optimization.of process *** regression.models of the con.idered respon.es(slump,C-28,F-28,an. S-28)were *** results obtain.d from the an.lysis of varian.e(An.VA)an. Pareto chart were used to determin. the statistical sign.fican.e of the process *** in.luen.e of the variables on.the respon.es was studied by mean. of the surface plot *** optimal proportion.of the variables again.t the respon.es was obtain.d through optimization.*** resulted regression.equation. were in.the form of secon.-order polyn.mial equation.an. the prediction.of stren.th properties was foun. to be in.lin. with the experimen.al *** differen.e of proportion.of varian.e in.icated that on.y 0.43%,6.42%,5.15%,an. 9.7%of deviation. can.ot be expressed by the *** An.VA an. Pareto charts represen.ed the high sign.fican.e an. appropriaten.ss of the lin.ar term of slump respon.e an. the two-way in.eraction.term of stren.th *** results of the optimization.respon.e revealed the optimal proportion. of recycled con.rete fin.s an. coal bottom ash as 19.15%an. 7.02%,respectively.

关键词： reactive powder con.rete mechan.cal properties fresh properties statistics study coal bottom ash

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In.estigation. on.lumin.scen.e of rare earths doped CatiO_3:Pr^(3+) phosphor

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Journ.l of Rare Earths 2010年第4期28卷 488-492页

作者： n. Suriyamurthy B.S. Pan.grahi Radiological Safety Division techn.cal Services Division Indira Gandhi Centre for Atomic Research Kalpakkam-603 102 India

Calcium titan.te doped with praseodymium was prepared through solid state reaction.an. it exhibited in.en.e red emission.at 612 n.. Phosphors were characterized for photolumin.scen.e, thermo-lumin.scen.e an. afterglow emission.. Study of effects of rare earths on.photolumin.scen.e as well as afterglow in.en.ity was reported. Presen.e of gadolin.um en.an.ed lumin.scen.e. Presen.e of some mon.valen. ion. en.an.ed both afterglow an. photolumin.scen.e emission. thermo-lumin.scen.e glow curves were an.lyzed an. ...

关键词： perovskites calcium titan.tes red afterglow rare earths

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Chloride bin.in. an. time-depen.en. surface chloride con.en. models for fly ash con.rete

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Fron.iers of Structural an. Civil En.in.erin. 2016年第1期10卷 112-120页

作者： S. MUtHULIn.AM B. n. RAO Departmen. of Civil En.in.erin. SSN College of Engineering Kalavakkam 603 110 India Structural En.in.erin. Division Department of Civil Engineering Indian Institute of Technology Madras Chennai 600 036 India

Corrosion.of embedded rebars is a classical deterioration.mechan.sm of rein.orced con.rete structures exposed to chloride en.iron.en.s. Such en.iron.en.s can.be attributed to the presen.e of seawater, deicin. or sea-salts, which have high con.en.ration. of chloride ion. Chloride in.ress in.o con.rete, essen.ial for in.ucin. rebar corrosion. is a complex in.eraction.between.man. physical an. chemical processes. the curren. study proposes two chloride in.ress parameter models for fly ash con.rete, n.mely： 1） surface chloride con.en. un.er tidal exposure con.ition. an. 2） chloride bin.in.. First, in.on.isten.ies in.surface chloride con.en. an. chloride bin.in. models reported in.literature, due to them n.t bein. in.lin. with past research studies, are poin.ed out. Secon.ly, to avoid such in.on.isten.ies, surface chloride con.en. an. chloride bin.in. models for fly ash con.rete are proposed based upon.the experimen.al work don. by other researchers. It is observed that, proposed models are simple, con.isten. an. in.lin. with past research studies reported in.literature.

关键词： bin.in. isotherms chloride in.ress con.rete fly ash surface chloride con.en.

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n.n.hydrostatic versus hydrostatic modelin.s of free surface flows

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Journ.l of Hydrodyn.mics 2014年第4期26卷 512-522页

作者：张景新 SUKHODOLOV Alexan.er n. 刘桦 MOE Key Laboratory of Hydrodyn.mics Shanghai Jiao Tong University Key Laboratory of Estuarin. an. Coastal En.in.erin. Ministry of Transport School of n.val Architecture Ocean and Civil EngineeringShanghai Jiao Tong University Departmen. of Ecohydrology Institute of Fresh-water Ecology and Inland Fisheries MOE Key Laboratory of Hydrodyn.mics Shanghai Jiaotong University

the hydrodyn.mics of geophysical flows in.ocean.c shelves, estuaries, an. rivers are often.studied by solvin. shallow water equation. un.er either hydrostatic or n.n.hydrostatic assumption.. Although the hydrostatic models are quite accurate an. cost-efficien. for man. practical application., there are situation. when.the fully hydrodyn.mic models are preferred despite a larger cost for computation.. the presen. n.merical model is implemen.ed by the fin.te volume method （FVM） based on.un.tructured grids. the model can.be efficien.ly switched between.hydrostatic an. n.n.hydrostatic modules. the case study shows that for waves pro- pagatin. alon. the bar a criterion.with respect to the shallown.ss alon., the ratio between.the depth an. the wave len.th, is in.ufficien. to warran. the performan.e of shallow flow equation. with a hydrostatic approach an. the n.n.in.arity in.wave dyn.mics can.be better accoun.ed with a hydrodyn.mic approach. Besides the prediction.of the flows over complex bathymetries, for in.tan.e, over asymmetrical dun.s, by a hydrodyn.mic approach is shown.to be superior in.accuracy to the hydrostatic simulation.

关键词： hydrostatic n.n.hydrostatic tVD scheme n.n.orthogon.l grid

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Improved n.n.in.ar fluid model in.rotatin. flow

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Applied Mathematics an. Mechan.cs(En.lish Edition. 2012年第11期33卷 1419-1430页

作者： n. AShraFI H. KARIMI-HAGHIGHI Departmen. of Mechan.cal an. Aerospace En.in.erin. Science and Research Branch Islamic Azad University

the pseudoplastic circular Couette flow （CCF） in.an.uli is in.estigated. the viscosity is depen.en. on.the shear rate that directly affects the con.ervation.equation. solved by the spectral method in.the presen. study. the pseudoplastic model adopted here is shown.to be the suitable represen.ative of n.n.in.ar fluids. Un.ike the previous studies, where on.y the square of the shear ered to ease the n.merical man.pulation., quadratic power is also taken.in.o accoun.. rate term in.the viscosity expression.is con.id- in.the presen. study, the term con.ain.n. the the curved streamlin.s of the CCF can.cause the cen.rifugal in.tability leadin. to toroidal vortices, kn.wn.as the taylor vortices. It is further foun. that the critical taylor n.mber becomes lower as the pseudoplastic effect in.reases. the comparison.with the existin. measuremen.s on.the pseudoplastic CCF results in.good agreemen..

关键词： pseudoplastic circular Couette flow (CCF) toroidal vortex spectralmethod

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Fron.iers of Computer Scien.e 2017年第2期11卷 307-319页

作者： Chuitian.ROn. Yasin.n. SILVA Chun.in. LI School of Computer Scien.e & Software En.in.erin. Tianjin Polytechnic University Tianjin 300387 China School of Mathematical & n.tural Scien.es Arizona State University Tempe AZ 85281 USA

Strin. similarity join.is an.essen.ial operation.of man. application. that n.ed to fin. all similar strin. pairs from two given.collection.. A quan.itative way to determin. whether two strin.s are similar is to compute their similarity based on.a certain.similarity fun.tion. the strin. pairs with similarity above a certain.threshold are regarded as results. the curren. approach to solvin. the similarity join.problem is to use a un.que threshold value. there are, however, several scen.rios that require the support of multiple thresholds, for in.tan.e, when.the dataset in.ludes strin.s of various len.ths. In.this scen.rio, lon.er strin. pairs typically tolerate much more typos than.shorter on.s. therefore, we proposed a so- lution.for strin. similarity join. that supports differen. simi- larity thresholds in.a sin.le operator. In.order to support dif- feren. thresholds, we devised two n.vel in.exin. techn.ques： partition.based in.exin. an. similarity aware in.exin.. to utilize the n.w in.ices an. improve the join.performan.e, we proposed n.w filterin. methods an. in.ex probin. tech- n.ques. to the best of our kn.wledge, this is the first work that addresses this problem. Experimen.al results on.real-world datasets show that our solution.performs efficien.ly while pro- vidin. a more flexible threshold specification.

关键词： similarity join similarity aware in.ex similarity thresholds

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Flow, thermal, an. vibration.an.lysis usin. three dimen.ion.l fin.te elemen. an.lysis for a flux reversal gen.rator

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Fron.iers in.En.rgy 2016年第4期10卷 424-440页

作者： B. VIDHYA K. n. SRIn.VAS 1. Departmen. of Electrical an. Electron.cs En.in.erin. B. S. Abdur Rahman University Chennai 600048 India

this paper presen.s the simulation.of major mechan.cal properties of a flux reversal gen.rator （FRG） viz., computation.l fluid dyn.mic （CFD）, thermal, an. vibration. A three-dimen.ion.l fin.te elemen. an.lysis （FEA） based CFD techn.que for fin.in. the spread of pressure an. air velocity in.air region. of the FRG is described. the results of CFD are main.y obtain.d to fin. tun. the thermal an.lysis. thus, in.this focus, a flow an.lysis assisted thermal an.lysis is presen.ed to predict the steady state temperature distribution.in.ide FRG. the heat tran.fer coefficien. of all the heat producin. in.er walls of the machin. are evaluated from CFD an.lysis, which forms the main.factor for the prediction.of accurate heat distribution. the vibration.an.lysis is illustrated. Major vibration.sources such as mechan.cal, magn.tic an. applied loads are covered elaborately which con.ists of a 3D modal an.lysis to fin. the n.tural frequen.y ofFRG, a 3D static stress an.lysis to predict the deformation.of the stator, rotor an. shaft for differen. speeds, an. an.un.alan.ed rotor harmon.c an.lysis to fin. eccen.ricity of rotor to make sure that the vibration.of the rotor is within.the acceptable limits. Harmon.c an.lysis such as sin. sweep an.lysis to iden.ify the ran.e of speeds causin. high vibration. an. steady state vibration.at a mode frequen.y of 1500 Hz is presen.ed. the vibration.an.lysis in.esti- gates the vibration.of the FRG as a whole, which forms the con.ribution.of this paper in.the FRG literature.

关键词： flux reversal gen.rator air velocity computa-tion.fluid dyn.mics thermal an.lysis vibration.an.lysis,fin.te elemen. an.lysis

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Improved hybrid position.force con.roller design.of a flexible robot man.pulator usin. a slidin. observer

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Journ.l of Systems En.in.erin. an. Electron.cs 2009年第1期20卷 146-158页

作者： Farooq M Wan. Daobo Dar n. U Coll. of Automation.En.in.erin. Nanjing Univ. of Aeronautics & Astronautics Nanjing 210016 P. R. China Coll. of Mechan.cal En.in.erin. Univ. of Engineering and Technology Taxila Pakistan

An.improved hybrid position.force con.roller design.of a flexible robot man.pulator is presen.ed usin. a slidin. observer. the friction.between.the en. effector an. the en.iron.en. is con.idered an. compen.ated. For systematic reason. the con.roller is design.d takin. in.o con.ideration.the rigid lin. subsystems an. the flexible join.s. the proposed con.rol system satisfies the stability of the two subsystems an. copes with the un.ertain.y of robot dyn.mics. A slidin. observer is design.d to estimate the time derivative of the torque applied as in.ut to the rigid part of the robot. For the stability of the observer, it is assumed that the un.ertain.y of the observed system is boun.ed. A MRAC algorithm is used for the estimation.of the friction.forces at the con.act poin. between.the en. effector an. the en.iron.en.. Fin.lly simulation.an. experimen.al results are given. to demon.trate the effectiven.ss of the proposed con.roller.

关键词： force con.rol slidin. con.rol Lyapun.v stability robot en. effector friction.force.

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En.in.erin. platelet-mimickin. drug delivery vehicles

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Fron.iers of Chemical Scien.e an. En.in.erin. 2017年第4期11卷 624-632页

作者： Hu, Quan.in.Bomba, Hun.er n. Gu, Zhen Un.v n.rth Carolin. Chapel Hill Joint Dept Biomed Engn Chapel Hill NC 27599 USA n.rth Carolin. State Un.v Raleigh NC 27695 USA Un.v n.rth Carolin. Chapel Hill Eshelman Sch Pharm Div Mol Pharmaceut Chapel Hill NC 27599 USA Un.v n.rth Carolin. Chapel Hill Eshelman Sch Pharm Ctr Nanotechnol Drug Delivery Chapel Hill NC 27599 USA Un.v n.Carolin. Sch Med Dept Med Chapel Hill NC 27599 USA

Platelets dyn.mically participate in.various physiological processes, in.ludin. woun. repair, bacterial clearan.e, immun. respon.e, an. tumor metastasis. Recreatin. the specific biological features of platelets by mimickin. the structure of the platelet or tran.locatin. the platelet membran. to syn.hetic particles holds great promise in.disease treatmen.. this review highlights recen. advan.emen.s made in.the platelet-mimickin. strategies. the future opportun.ties an. tran.lation.l challen.es are also discussed.

关键词： drug delivery platelets n.n.medicin.,bio-in.pired biomimetic

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Femoroacetabular impin.emen. is more common.in.military veteran. with en.-stage hip osteoarthritis than.civilian.patien.s: a retrospective case con.rol study

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Military Medical Research 2020年第1期7卷 71-76页

作者： Kate n.Jochimsen.Cale A.Jacobs Stephen.t.Dun.an Departmen. of Rehabilitation.Scien.es University of Kentucky900 South Limestone StreetLexingtonKY 40536USA Departmen. of Orthopaedic Surgery an. Sports Medicin. University of Kentucky740 South Limestone StreetLexingtonKY 40536USA

Backgroun.: the purpose of this study was to compare the frequen.y of femoroacetabular impin.emen.(FAI) between.matched groups of military veteran. an. civilian.patien.s with en.-stage hip osteoarthritis(OA).Methods: Patien.s who un.erwen. a primary total hip arthroplasty(tHA) between.Jan.ary 1, 2015 an. December 31, 2015 at a sin.le Veteran.s Affairs Hospital were iden.ified. Veteran. were then.matched 1:2 with civilian.patien.s from our prospective outcome registry. the alpha an.le an. lateral cen.er-edge an.le(LCEA) were measured by a sin.le evaluator. In.epen.en. t-tests were used to compare join. an.les, an. Fisher exact tests were used to compare the prevalen.e of cam(alpha an.le ≥60°), pin.er(LCEA ≥40°), or mixed-type ***: twen.y-on. veteran. were matched 1:2 with civilian.patien.s. the mean.alpha an.le did n.t sign.fican.ly differ between.groups(P=0.33) n.r did the prevalen.e of cam deformities(P=0.79). the LCEAs were sign.fican.ly greater in.veteran. than.in.civilian.(P=0.04), an. veteran. also demon.trated a sign.fican.ly greater prevalen.e of pin.er an. mixed-type deformities than.civilian.(P=0.025 an. P=0.004, respectively).Con.lusion.: these results suggest that FAI is perhaps a more common.mechan.sm in.the progression.of OA in.a veteran.population.than.in.a civilian.population. as pin.er an. mixed-type deformities were sign.fican.ly more common.amon. veteran. than.civilian.. the forces born. by the hip durin. military train.n. exceed n.rmal physiologic con.ition.. In.addition. the time between.symptom on.et an. surgical correction.may be 10–12 mon.hs lon.er for active military person.el than.for civilian.. the combin.tion.of in.reased physical deman.s an. a protracted time to treatmen. highlights the n.ed for better recogn.tion.of FAI in.military members. Future studies are n.cessary to determin. whether earlier in.erven.ion.may preven. or delay the progression.to en.-stage OA an. the n.ed for total hip arthroplasty.

关键词： Femoroacetabular impin.emen. Osteoarthritis Hip Acetabular labral tear Hip arthroplasty

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