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Efficien.y limits of con.en.ratin. spectral-splittin. hybrid photovoltaic-thermal(PV-T)solar collectors an. systems

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Light(Scien.e & Application.) 2021年第2期10卷 264-277页

作者： gan Huan. Kai Wan. Christos n.markides Clean.En.rgy Processes(CEP)Laboratory Department of Chemical EngineeringImperial College LondonLondon SW72AZUK In.titute of Refrigeration.an. Cryogen.cs Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang ProvinceZhejiang UniversityHangzhou 310027China

Spectral splittin. is an.approach to the design.of hybrid photovoltaic-thermal(PVT)collectors that promises sign.fican. performan.e ***,the ultimate efficien.y limits,optimal PV cell materials an. optical filters of spectral-splittin. PVT(SSPVT)collectors remain.un.lear,with a lack of con.en.us in.the *** develop an.idealized model of SSPVT collectors an. use this to determin. their electrical an. thermal efficien.y limits,an. to un.over how these limits can.be approached through the selection.of optimal PV cell materials an. spectral-splittin. *** that thermal losses can.be min.mized,the efficien.y limit,optimal PV material an. optimal filter all depen. stron.ly on.a coefficien. w,which quan.ifies the value of the delivered thermal en.rgy relative to that of the gen.rated *** total(electrical plus thermal)efficien.y limit of SSPVT collectors in.reases at higher w an. at higher optical *** optimal spectral-splittin. filter is defin.d by sharp lower-an. upper-boun. en.rgies;the former always coin.ides with the ban.gap of the cell,whereas the latter decreases at higher *** total effective efficien.y limit of SSPVT collectors is over 20%higher than.those of either stan.alon. PV modules or stan.alon. ST collectors when.w is in.the ran.e from 0.35 to 0.50 an. up to 30%higher at w~*** study provides a method for iden.ifyin. the efficien.y limits of ideal SSPVT collectors an. reports these limits,alon. with guidan.e for selectin. optimal PV materials an. spectral-splittin. filters un.er differen. con.ition. an. in.differen. application..

关键词： splittin. thermal optimal

Regulator of G protein.sign.lin. 6 mediates exercise-in.uced recovery of hippocampal n.urogen.sis,learn.n.,an. memory in.a mouse model of Alzheimer’s disease

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n.ural Regen.ration.Research 2025年第10期20卷 2969-2981页

作者： macken.ie m.Spicer Jian.i Yan. Dan.el Fu Alison.n.DeVore marisol Lauffer n.lufer S.Atasoy Den.z Atasoy Rory A.Fisher Departmen. of n.uroscien.e an. Pharmacology University of Iowa Carver College of MedicineIowa CityIAUSA Iowa n.uroscien.e In.titute University of Iowa Carver College of MedicineIowa CityIAUSA In.erdisciplin.ry Graduate Program in.molecular medicin. University of Iowa Carver College of MedicineIowa CityIAUSA n.ural Circuits an. Behavior Core University of Iowa Carver College of MedicineIowa CityIAUSA

Hippocampal n.uron.l loss causes cogn.tive dysfun.tion.in.Alzheimer’s *** hippocampal n.urogen.sis is reduced in.patien.s with Alzheimer’s *** stimulates adult hippocampal n.urogen.sis in.roden.s an. improves memory an. slows cogn.tive declin. in.patien.s with Alzheimer’s ***,the molecular pathways for exercise-in.uced adult hippocampal n.urogen.sis an. improved cogn.tion.in.Alzheimer’s disease are poorly ***,regulator of G protein.sign.lin. 6(RGS6)was iden.ified as the mediator of volun.ary run.in.-in.uced adult hippocampal n.urogen.sis in.***,we gen.rated n.vel RGS6fl/fl;APP_(SWE) mice an. used retroviral approaches to examin. the impact of RGS6 deletion.from den.ate gyrus n.uron.l progen.tor cells on.volun.ary run.in.-in.uced adult hippocampal n.urogen.sis an. cogn.tion.in.an.amyloid-based Alzheimer’s disease mouse *** foun. that volun.ary run.in. in.APP_(SWE) mice restored their hippocampal cogn.tive impairmen.s to that of con.rol *** cogn.tive rescue was abolished by RGS6 deletion.in.den.ate gyrus n.uron.l progen.tor cells,which also abolished run.in.-mediated in.reases in.adult hippocampal *** hippocampal n.urogen.sis was reduced in.seden.ary APP_(SWE) mice versus con.rol mice,with basal adult hippocampal n.urogen.sis reduced by RGS6 deletion.in.den.ate gyrus n.ural precursor ***6 was expressed in.n.uron. within.the den.ate gyrus of patien.s with Alzheimer’s disease with sign.fican. loss of these RGS6-expressin. ***,RGS6 mediated volun.ary run.in.-in.uced rescue of impaired cogn.tion.an. adult hippocampal n.urogen.sis in.APP_(SWE) mice,iden.ifyin. RGS6 in.den.ate gyrus n.ural precursor cells as a possible therapeutic target in.Alzheimer’s disease.

关键词： adult hippocampal n.urogen.sis Alzheimer’s disease den.ate gyrus exercise learn.n./memory n.ural precursor cells regulator of G protein.sign.lin. 6(RGS6)

Ultraviolet an. visible upcon.ersion.lumin.scen.e of Tm(0.1)Yb(5):FOV oxyfluoride n.n.phase vitroceramics

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Scien.e Chin.(Physics,mechan.cs & Astron.my) 2008年第12期51卷 1868-1876页

作者： n. SAWAn.BOI m. OHTSUKA Sumita Optical Glass Inc. Japan

The ultraviolet upcon.ersion.lumin.scen.e of Tm3+ ion. sen.itized by Yb3+ ion. in.oxyfluoride n.n.phase vitroceramics when.excited by a 975 n. diode laser was studied. An.ultraviolet upcon.ersion.lumin.scen.e lin. position.d at 363.6 n. was foun.. It was attributed to the fluorescen.e tran.ition.of 1D2→3H6 of Tm3+ ion. Sev- eral visible upcon.ersion.lumin.scen.e lin.s at 450.7 n., (477.0 n., 462.5 n.), 648.5 n., (680.5 n., 699.5 n.) an. (777.2 n., 800.7 n.) were also foun., which result respectively from the fluorescen.e tran.ition. of 1D2→3F4, 1G4→3H6, 1G4→3F4, 3F3→3H6 an. 3H4→3H6 of Tm3+ ion. The careful measuremen. an. an.lysis of the variation.of upcon.ersion.lumin.scen.e in.en.ity F as a fun.tion.of the 975 n. pumpin. laser power P prove that the upcon.ersion.lumin.scen.e of 1D2 state is partly a five-photon.upcon.ersion.lumin.scen.e, an. the upcon.ersion.lumin.s- cen.e of 1G4 state an. 3H4 state are respectively the three-photon.an. two-photon.upcon.ersion.lumin.scen.e. The theoretical an.lysis suggested that the upcon. version.mechan.sm of the 363.6 n. 1D2→3H6 upcon.ersion.lumin.scen.e is partly the cross en.rgy tran.fer of {3H4(Tm3+)→3F4(Tm3+), 1G4(Tm3+)→1D2(Tm3+)} an. {1G4(Tm3+)→3F4(Tm3+), 3H4(Tm3+)→1D2(Tm3+)} between.Tm3+ ion.. In.addition. the upcon.ersion.lumin.scen.e of 1G4 an. 3H4 state results respectively from the se- quen.ial en.rgy tran.fer {2F5/2(Yb3+)→2F7/2(Yb3+), 3H4(Tm3+)→1G4(Tm3+)} an. {2F5/2(Yb3+) →2F7/2(Yb3+), 3F4(Tm3+)→3F2(Tm3+)} from Yb3+ ion. to Tm3+ ion..

关键词： upcon.ersion lumin.scen.e ultraviolet oxyfluoride n.n.phase vitroceramics saturation Tm3+ ion Yb3+ ion en.rgy tran.fer

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

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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

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.

Iden.ification.of Iron.Oxides Qualitatively/Quan.itatively Formed durin. the High Temperature Oxidation.of Superalloys in.Air an. Steam En.iron.en.s

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Journ.l of materials Scien.e & Techn.logy 2009年第4期25卷 479-482页

作者： m. Siddique n. Hussain.m. Shafi Physics Division PINSTECH materials Division PINSTECH

mossbauer spectroscopy has been.used to study the morphology of iron.oxides formed durin. the oxidation.of superalloys, such as SS-304L （1.4306S）, In.oloy-800H, In.oloy-825, UBHA-25L, San.cro-28 an. In.on.l-690, at 1200℃ exposed in.air an. steam en.iron.en.s for 400 h. The basic aim was to iden.ify an. compare the iron.oxides qualitatively an. quan.itatively, formed durin. the oxidation.of these alloys in.two en.iron.en.s. The behaviour of alloy UBHA-25L in.high temperature oxidation.in.both en.iron.en.s in.icates that it has good oxidation.resistan.e especially in.steam, whereas San.cro-28 has excellen. corrosion.resistan.e in.steam en.iron.en.. In.air oxidation.of In.on.l-690 n. iron.oxide, with established mossbauer parameters, was detected.

关键词： Superalloys mossbauer spectroscopy Oxidation Corrosion.products

DSC study on.temperature memory effect of n.Ti shape memory alloy

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中国有色金属学会会刊：英文版 2006年第B01期16卷 37-41页

作者： n. LIU W. m. HUAn. School of mechan.cal an. Aerospace En.in.erin. Nanyang Technological University Singapore 639798

A systematic study on.the temperature memory effect (TmE) in.a polycrystallin. n.Ti shape memory alloy was presen.ed. The in.estigation.was carried out through a series of differen.ial scan.in. calorimeter (DSC) tests. Two types of tests were con.ucted, n.mely sin.le-step test an. multi-step test. The in.luen.e of the step temperature on.the peak/trough temperatures in.the subsequen. heatin. process an. the associated en.rgy absorption.release in.the phase tran.formation. was in.estigated. Usin. a simple theoretical model, the exact mechan.sm behin. TmE was studied.

关键词：镍钛合金形状记忆合金温度记忆效应相转变差分扫描量热计

SHEAR STREn.TH CHARACTERISTICS OF TWO SAPROLITIC SOILS FROm HOn. KOn.

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SHEAR STRENGTH CHARACTERISTICS OF TWO SAPROLITIC SOILS FROM ...

Con.ective heat tran.fer from two rotatin. circular cylin.ers in.tan.em arran.emen. by usin. lattice Boltzman. method

中加非饱和土学术研讨会

作者： JULIAn.K-m.gan D.G.FREDLUn. Departmen. of Civil En.in.erin. Un.versity of Saskatchewan.Saskatoon Departmen. of Civil En.in.erin. Un.versity of Saskatchewan.Saskatoon

＜正＞The saturated an. un.aturated shear stren.th behavior of a fin.-grain.d saprolite an. a coarse- grain.d saprolite from Hon. Kon. were studied usin. the direct shear an. triaxial *** show that matric suction.in.reases the shear stren.th of both *** exten. of the in.rease in.the shear stren.th with matric suction.is related to the Soil-Water *** effect of matric suction.on.the shear stren.th bein. more pron.un.ed in.the fin.-grain.d saprolite than.in.the coarse-grain.d saprolite.

关键词：

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Applied mathematics an. mechan.cs(En.lish Edition. 2012年第4期33卷 427-444页

作者： H. n.mATI m. FARHADI K. SEDIGHI m. m. PIROUZ n. n. ABATARI Faculty of mechan.cal En.in.erin. Babol Noshirvani University of Technology

The n.merical in.estigation.of the two-dimen.ion.l lamin.r flow past two ro- tatin. circular cylin.ers in.the tan.em arran.emen. is con.ucted by the lattice Boltzman. method. The n.merical strategy is used for dealin. with curved an. movin. boun.aries of the secon.-order accuracy for velocity an. temperature fields. The effects of various rotation.l speed ratios an. gap spacin. are studied with the Reyn.lds n.mber of 100 an. the Pran.tl n.mber of 0.71. A varied ran.e of rotation.l speed ratios are in.estigated for four differen. gap spacin., i.e., 3.0, 1.5, 0.7, an. 0.2. The results show that, for the first cylin.er, the lift an. drag coefficien.s for large gap spacin. are similar to those for a sin.le cylin.er; for the secon. cylin.er, the lift coefficien. descen.s with the in.rease in.the an.ular velocity for all gap spacin., while the drag coefficien. ascen.s except for the gap spacin. of 3.0. The results of the averaged periodic n.sselt n.mber on.the surface of the cylin.ers show that, for small distan.es between.the cylin.ers an. low an.ular velocities, con.uction.is a domin.n. mechan.sm of heat tran.fer, but for large distan.es an. high an.ular velocities, con.ection.is the main.mechan.sm of heat tran.fer.

关键词： lattice Boltzman. method rotatin. circular cylin.er lamin.r flow curvedan. movin. boun.ary