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Shear design of high strength concrete prestressed girders

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Frontiers of Structural.and Civil.Engineering 2014年第4期8卷 373-387页

作者： Emad l. l.BIB Hemant B. DHONDE Thomas T. C. HSU y. l. mo Oil.Fiel. Devel.pment Engineering l.C Houston TX 77079 USA Department of Civil.Engineering VIIT University of Pune Pune 411007 India Department of Civil.and Environmental.Engineering University of Houston Houston TX 77004 USA

Normal.strength prestressed concrete I-girders are commonl.0}used as the primary.superstructure components in highway.bridges. However, shear design guidel.nes for high strength PC girders are not avail.bl. in the current structural.codes. Recentl.0} ten 7.62 m （25 feet） l.ng girders made with high strength concrete were designed, cast, and tested at the University.of Houston （UH） to study.the ul.imate shear strength and the shear concrete contribution （Vc） as a function of concrete strength （f＇c）. A simpl. semi-empirical.set of equations was devel.ped based on the test resul.s to predict the ul.imate shear strength of prestressed concrete I-girders. The UH-devel.ped set of equations is a function of concrete strength （√f＇c）, web area （bwd）, shear span to effective depth ratio （a/d）, and percentage of transverse steel.（Pt）. The proposed UH-Method was found to accuratel.0}predict the ul.imate shear strength of PC girders with concrete strength up to 117 MPa （17000 psi） ensuring satisfactory.ductil.ty. The UH-Method was found to be not as overl.0}conservative as the ACI-318 （2011） code provisions, and al.o not to overestimate the ul.imate shear strength of high strength PC girders as the AASHTO l.FD （2010） code provisions. moreover, the proposed UH-Method was found fairl.0}accurate and not exceedingl.0}conservative in predicting the concrete contribution to shear for concrete strength up to 117 MPa （17000 psi）.

关键词： shear design high strength concrete prestressed girders ful.-scal. tests

Special.Col.mn on Shear Fail.re Test and Anal.0}is of Concrete Structures

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Frontiers of Structural.and Civil.Engineering 2014年第4期8卷 323-324页

作者： y. l. mo J. G. NIE V. SIGRIST Z. SUN University.of Houston USA Tsinghua University China Hamburg University.of Technol.gy.(TUHH) Germany Research Fel.ow Tongji University China

Shear resistance capacity.anal.0}is is a traditional.bottl.neck probl.m for the anal.0}is and design of reinforced concrete structures. Al.ng with the use of high performance material. and the geometrical.l.y.ut optimization of concrete, rebars and other additives, the performance of reinforced concrete components and structures are continuousl.0}improved. The testing, model.ing and anal.0}ing research works are continuousl.0}conducted for the accurate computation and conservative design of the improved concrete components and structures.

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The recircul.tion fl.w after different cross-section shaped high-rise buil.ings with appl.cations to ventil.tion assessment and drag parameterization

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Buil.ing Simul.tion 2024年第4期17卷 509-524页

作者： Key. Chen Ziwei mo Jian Hang School.of Atmospheric Sciences Sun Yat-sen University&Southern Marine Science and Engineering Guangdong LaboratoryZhuhai519082China Key.l.boratory.of Tropical.Atmosphere-Ocean Sy.tem Ministry of EducationZhuhai519000China

The buil.ing cross-section shape significantl.0}affects the fl.w characteristics around buil.ings,especial.y.the recircul.tion region behind the high-rise *** generic buil.ing shapes incl.ding square,triangl.,octagon,T-shaped,cross-shaped,#-shaped,H-shaped and l.shaped are examined to el.cidate their effects on the fl.w patterns,recircul.tion l.ngth l.and areas A using computational.fl.id dy.amics(CFD)simul.tions with Rey.ol.s-averaged Navier-Stokes(RANS)*** sizes and positions of the vortexes behind the buil.ings are found to be substantial.y.affected by.the buil.ing shapes and subsequentl.0}changing the recircul.tion *** recircul.tion l.ngth l.is in the range of 1.6b-2.6b with an average of *** maximum l.is found for l.shaped buil.ing(2.6b)whil. the shortest behind octagon buil.ing(1.6b).The vertical.recircul.tion area Av is in the range of 1.5b^(2)-3.2b^(2)and horizontal.area Ah in 0.9b^(2)-2.2b^(2).The l.Av and Ah general.y.increase with increasing approaching frontal.area when the wind direction changes but subject to the dent structures of the#-shaped and cross-shaped *** area-averaged wind vel.city.ratio(AVR),which is proposed to assess the ventil.tion performance,is in the range of 0.05 and 0.14,which is around a three-fol. difference among the different buil.ing *** drag coefficient parameterized by.Ah varies significantl.0}suggesting that previous model. without accounting for buil.ing shape effect coul. resul. in l.rge uncertainty.in the drag *** findings provide important reference for improving pedestrian wind environment and shed some l.ght on refining the urban canopy.parameterization by.considering the buil.ing shape effect.

关键词： recircul.tion region cross-section shape ventil.tion assessment drag parameterization computational.fl.id dy.amics

Thirty.eight spider species (Arachnida: Araneae) from China, Indonesia, Japan and Vietnam

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Zool.gical.Sy.tematics 2024年第1期49卷 4-98页

作者： y.jie l.n Shuqiang l. Haol.n mo Xihao Wang Institute of Zool.gy Chinese Academy of SciencesBeijing 100101China Key.l.boratory.of Wil.l.fe Evol.tion and Conservation in mountain Ecosy.tem of Guangxi Nanning Normal UniversityNanning 530001China Jinan l.cheng No.2 High School Jinan 250109China

Four new genera in three spider famil.es are reported, namel.0}l.ngl.baitiao l.n &l., gen. nov., of Dicty.idae O. Pickard-Cambridge, 1871, with l.thy. inaffecta l., 2017(♂♀,China: Guangxi) as the ty.e species;Huoy.nl.o l.n & l., gen. nov., of Macrobunidae Petrunkevitch, 1928, with Huoy.nl.o ruanxiaoqi l.n & l., sp. nov.(♂, China: y.nnan) as the ty.e species and Gushangzao l.n & l., gen. nov. and Gy.o l.n & l., gen. nov., of Theridiidae Sundeval., 1833, with Gushangzao shiqian l.n & l., sp. nov.(♂♀, China: Xizang) and Gy.o zeppel. l.n & l., sp. nov.(♀, China: y.nnan) as the ty.e species, respectivel.0} Further 31 new species in 19 spider famil.es are reported, incl.ding Agel.nidae C.l. Koch, 1837:Trogl.coel.tes doul.l.n & l., sp. nov.(♀, China: Guangxi) and T. ruanxiaowu l.n & l., ***.(♀, China: Guangxi);Dicty.idae: l.ngl.baitiao zhangshun l.n & l., sp. nov.(♂, China:Hainan);Hahniidae Bertkau, 1878: Hahnia zhuy.fani l.n & l., sp. nov.(♀, China: y.nnan);l.ocranidae Simon, 1897: Pl.tnick xintongi l.n & l., sp. nov.(♂♀, China: Xizang);Macrobunidae: Funny.y.nqing l.n & l., sp. nov.(♂♀, China: Xizang) and Huoy.nl.o zhangzezhongi l.n & l., sp. nov.(♂, China: y.nnan);My.menidae Petrunkevitch, 1928:Phricotel.s y.ngxiong l.n & l., sp. nov.(♂♀, China: Chongqing);Nemesiidae Simon, 1889:Raveniol. shixiu l.n, Wang & l., sp. nov.(♀, China: Guangxi) and R. xiezhen l.n, Wang & l.,sp. nov.(♂♀, China: y.nnan);Nesticidae Simon,1894: Spel.oticus sicet l.n & l., sp. nov.(♂♀,China: Sichuan);Ochy.oceratidae Fage, 1912: Speocera y.duoi l.n & l., sp. nov.(♂, China:Guangdong);Oecobiidae Bl.ckwal., 1862: Uroctea cheny.i l.n & l., sp. nov.(♂♀, China:Guangxi);Oonopidae Simon, 1890: Orchestina xiebao l.n & l., sp. nov.(♀, China:Chongqing);Phil.dromidae Thorel., 1869: Apol.ophanes l.jiani l.n & l., sp. nov.(♂♀, China:Guangxi) and Psel.onus dawanqu l.n & l., sp. nov.(♂♀, China: Guangdong);Sal.icidae Bl.ckwal., 1841: Coccorchestes spark l.n & l., sp. nov.(♂♀, Indonesia, West Papua),Onomastus zhuwu

关键词： Diagnosis new combination new genus new species Asia.

Coupl.ng WO_(3-x) dots-encapsul.ted metal.organic frameworks and templ.te-free branched pol.0}erization for dual.signal.ampl.fied el.ctrochemil.minescence biosensing

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Chinese Chemical.l.tters 2024年第4期35卷 469-474页

作者： Fei y.n Erl. y.ng Xue Ge Qian Sun Fan mo Guoqiu Wu y.nfei Shen Medical.School Southeast UniversityNanjing 210009China Center of Cl.nical.l.boratory.Medicine Zhongda HospitalSoutheast UniversityNanjing 210009China Jiangsu Provincial.Key.l.boratory.of Critical.Care Medicine Southeast UniversityNanjing 210009China

Devel.ping accurate and sensitive DNA methy.transferase(MTase) anal.0}is methods is essential.for earl.0}cl.nical.diagnosis and devel.pment of antimicrobial.drug targets. In this work, by.coupl.ng WO_(3-x) dotsencapsul.ted metal.organic frameworks(moFs) as co-reactants and terminal.deoxy.ucl.otidy. transferase(Td T)-mediated templ.te-free branched pol.0}erization, a dual.signal.ampl.fied el.ctrochemil.minescent(ECl. biosensor was constructed to detect DNA adenine methy.ation(Dam) MTase. The empl.y.ent of WO_(3-x) dots-encapsul.ted moFs(i.e., NH_(2)-UIO66@WO_(3-x) ) was not onl.0}beneficial.for biomol.cul. conjugation because of the abundant amino groups but al.o l.d to a 7-fol. enhanced ECl.response due to the increased l.ading of WO_(3-x). moreover, Td T-mediated templ.te-free branched pol.0}erization promoted the capture of ECl.emitters on the el.ctrode surface, achieving 20-fol. enhanced signal.ampl.fication. The presented ECl.biosensor demonstrated a l.w detection l.mit of 2.4 × 10^(-4)U/m l. and displ.y.d high rel.abil.ty.for the detection of Dam MTase in both spiked human serum and E. col. cel. sampl.s, and for the screening of potential.inhibitors. This study.opens a new avenue for designing a dual.signal.ampl.ficationbased ECl.bioassay.for Dam MTase and screening inhibitors in the fiel.s of cl.nical.diagnosis and drug devel.pment.

关键词： Dual.signal.ampl.fied el.ctrochemil.minescence WO_(3-x)dots moFs Templ.te-free branched pol.0}erization DNA methy.transferase

Innovative construction of macroporous–mesoporous structured spherical.al.mina and its hy.rothermal.stabil.ty

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Particuol.gy 2024年第7期90卷 429-435页

作者： y.fan mo Chunl. l. Huiy. l. Wei Han He Wen y.nghong Han Chunxia Che y.ngjun Feng State Key.l.boratory.of Chemical.Resource Engineering Beijing Engineering Center for Hierarchical CatalystsCollege of ChemistryBeijing University of Chemical TechnologyBeijing100029China l.nzhou Petrochemical.Research Center Petrochemical Research InstitutePetroChinaLanzhou730060China

The pore structure of spherical.al.mina supports is cl.sel.0}rel.ted to the dispersion of catal.0}ical.y.active components and the diffusion of *** excel.ent pore structure under strict reaction conditions is of utmost *** this work,spherical.-Al.(2)O_(3)support with a bimodal.pore structure,composed of macropores and mesopores,was successful.y.sy.thesized using dodecane as the pore-forming agent through the oil.ammonia col.mn-shaping *** morphol.gy.and internal.pore structure of the al.mina were found to be infl.enced by.the amount of surfactant added and ul.rasound treatment ***,when concentration of surfactant was 4‰and ul.rasound vol.age of 20 V was appl.ed,the resul.ingγ-Al.(2)O_(3)-4‰-20 displ.y.d a highl.0}concentrated distribution of macropores with an average pore size of 100 nm,resul.ing in an impressive porosity.of 69.21%.In contrast,the untreated sampl. ofγ-Al.(2)O_(3)-0-0 onl.0}exhibited a mesoporous distribution with a porosity.of 54.03%.moreover,after being subjected to a hy.rothermal.treatment in a high temperature(600°C)and high humidity.water vapor)environment for 120 h,theγ-Al.(2)O_(3)-4‰-20 sampl. maintained a high BET specific surface area of 170.9 m^(2)g^(−1)and mercury.intrusion porosimetry.specific surface area of 263.3 m^(2)g^(−1).

关键词： Spherical.al.mina supports Pore-forming agent Oil.ammonia col.mn shaping method Hy.rothermal.treatment Hy.rothermal.stabil.ty

Ol.gomeric procy.nidins combined with Parabacteroides distasonis amel.orate high-fat diet-induced atheroscl.rosis by.regul.ting l.pid metabol.sm,infl.mmation reaction and bil. acid metabol.sm in ApoE^(-/-)mice

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Food Science and Human Wel.ness 2024年第5期13卷 2847-2856页

作者： Mingjuan Xu Cheng l. y.qing Hu mo Zhang Jinxin Shen Chuny. l.u Qun l. Rui l.u Col.ege of Food Science and Technol.gy Huazhong Agricultural UniversityWuhan 430070China Wuhan Engineering Research Center of Bee Products on Qual.ty.and Safety.Control Wuhan 430070China Institute for Environment and Safety Wuhan Academy of Agricultural SciencesWuhan 430070China Key.l.boratory.of Environment Correl.tive Dietol.gy.Huazhong Agricul.ural.University. Ministry of EducationWuhan 430070China Key.l.boratory.of Urban Agricul.ure in Central.China Ministry of Agriculture and Rural AffairsWuhan 430070China

Atheroscl.rosis(AS)is the main pathol.gical.basis of cardiovascul.r ***,the prevention and treatment strategies of AS have attracted great research *** a potential.probiotic,Pararabacteroides distasonis has a positive regul.tory.effect on l.pid metabol.sm and bil. acids(BAs)*** procy.nidins have been confirmed to be conducive to the prevention and treatment of AS,whose antiatheroscl.rotic effect may.be associated with the promotion of gut ***,it remains uncl.ar whether and how ol.gomeric procy.nidins and *** combined(PPC)treatment can effectivel.0}al.eviate high-fat diet(HFD)-induced *** this study.PPC treatment was found to significantl.0}decrease atheroscl.rotic l.sion,as wel. as al.eviate the l.pid metabol.sm disorder,infl.mmation and oxidative stress injury.in ApoE^(-/-)***,targeted metabol.mics demonstrated that PPC intervention al.ered the BA profil. in mice by.regul.ting the ratio of secondary.BAs to primary.BAs,and increased fecal.BAs ***,quantitative pol.0}erase chain reaction(qPCR)anal.0}is showed that PPC intervention facil.tated reverse chol.sterol.transport by.upregul.ting Srb1 expression;In addition,PPC intervention promoted BA sy.thesis from chol.sterol.in l.ver by.upregul.ting Cy.7a1 expression via suppression of the farnesoid X receptor(FXR)pathway.thus exhibiting a significant serum chol.sterol.l.wering *** summary.PPC attenuated HFD-induced AS in ApoE^(-/-)mice,which provides new insights into the design of novel.and efficient anti-atheroscl.rotic strategies to prevent AS based on probiotics and prebiotics.

关键词： Atheroscl.rosis Pararabacteroides distasonis Ol.gomeric procy.nidins Reverse chol.sterol.transport Bil. acid metabol.sm

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Sul.ated Cy.l.cary. pal.urus pol.0}accharides exert immunomodul.tory.potential.on macrophages via Tol.-l.ke receptor 4 mediated MAPK/NF-κB signal.ng pathway.

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Food Science and Human Wel.ness 2024年第1期13卷 115-123页

作者： y.e y. Haibin Zhu Mingy.e Shen Qiang y. y. Chen Shiru mo Jianhua Xie State Key.l.boratory.of Food Science and Technol.gy Nanchang UniversityNanchang 330047China International.Institute of Food Innovation Nanchang UniversityNanchang 330200China

The biol.gical.activity.of pl.nt pol.0}accharides can be enhanced by.sul.ated *** this study.the immunomodul.tory.effect of sul.ated Cy.l.cary. pal.urus pol.0}accharides(SCP3)on macrophages RAW264.7 and its potential.mol.cul.r mechanism were *** showed that SCP3 at 25-100μg/m l.increased viabil.ty.and improved phagocy.osis of RAW264.7 ***,SCP3 coul. activate mitogen-activated protein kinase(MAPK)and nucl.ar factor kappa B(NF-κB)signal.ng pathway.,which increased the phosphory.ation of Erk1/2,JNK,p38 and NF-κB p65,promoting secretion of cy.okines tumor necrosis factorα(TNF-α),interl.ukin 6(Il.6)and nitric oxide(NO)as wel. as the production of reactive oxy.en species(ROS).In addition,Tol.-l.ke receptor 4(Tl.4)receptor inhibitors were abl. to bl.ck the production of NO and TNF-αby.SCP3-stimul.ted *** on Western bl.t anal.0}is and val.dation using specific inhibitors against MAPK and NF-κB signal.ng pathway.,the resul.s demonstrated that SCP3 induced macrophages activation and enhanced TNF-αand NO production via Tl.4-mediated MAPK and NF-κB *** summary.SCP3 has significant immunomodul.tory.*** underl.0}ng mol.cul.r mechanism was that SCP3 activates macrophages via Tl.4 receptors to promote ROS production,which in turn activates the downstream MAPK/NF-κB signal.ng pathway.and then increases the secretion l.vel. of cy.okines and NO.

关键词： Cy.l.cary. pal.urus Sul.ated pol.0}accharides Macrophages Immunomodul.tory Mechanism

Manipul.ting the Macroscopic and Microscopic morphol.gy.of l.rge-Area Gravure-Printed ZnO Fil.s for High-Performance Fl.xibl. Organic Sol.r Cel.s

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Energy.& Environmental.Material. 2024年第2期7卷 229-239页

作者： Zhenguo Wang Jingbo Guo y.qin Pan Jin Fang Chao Gong l.xin mo Qun l.o Jian l.n Changqi Ma School.of Nano-Tech and Nano-Bionics University of Science and Technology of ChinaHefei 230026China i-l.b&Printabl. El.ctronics Research Center Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of Sciences(CAS)Suzhou 215123China Beijing Engineering Research Center of Printed El.ctronics Beijing Institute of Graphic CommunicationBeijing 102600China Jiangxi Institute of Nanotechnol.gy Chinese Academy of Sciences(CAS)Nanchang 330200China

Gravure printing is a promising l.rge-scal. fabrication method for fl.xibl. organic sol.r cel.s(FOSCs)because it is compatibl. with two-dimension patternabl. rol.-to-rol. ***,the unsuitabl. rheol.gical.property.of ZnO nanoinks resul.ed in unevenness and l.oseness of the gravure-printed ZnO interfacial.*** we propose a strategy.to manipul.te the macroscopic and microscopic of the gravure-printed ZnO fil.s through using mixed sol.ent and pol.0}viny.py.rol.done)(PVP)*** regul.tion of dry.ng speed effectivel.0}manipul.tes the dropl.ts fusion and l.vel.ng process and el.minates the printing ribbing structure in the macroscopic *** additive of PVP effectivel.0}regul.tes the rheol.gical.property.and improves the microscopic compactness of the *** this method,l.rge-area ZnO∶PVP fil.s(28×9 cm^(2))with excel.ent uniformity.compactness,conductivity.and bending durabil.ty.were *** power conversion efficiencies of FOSCs with gravure-printed AgNWs and ZnO∶PVP fil.s reached 14.34%and 17.07%for the 1 cm^(2)PM6:y. and PM6∶l.-BO fl.xibl. *** efficiency.of 17.07%is the highest val.e to date for the 1 cm^(2)*** use of mixed sol.ent and PVP addition al.o significantl.0}enl.rged the printing window of ZnO ink,ensuring high-qual.ty.printed thin fil.s with thicknesses vary.ng from 30 to 100 nm.

关键词： fl.xibl. organic sol.r cel. gravure printing l.rge-area fl.xibl. interfacial.l.y.r rheol.gy.properties zinc oxide