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Experimental investig.tions of internal energ. dissipation during.fracture of fiber-reinforced ultra-hig.-performance concrete

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Frontiers of Structural and Civil Eng.neering 2019年第1期13卷 190-200页

作者： eric.N.landis Roman KRAVCHUK Dmitry LOSHKOV Department of Civil &Environmental Eng.neering University of MaineOronoME 04469USA

Split-cylinder fracture of fiber-reinforced ultra-hig.-performance concrete (UHPC)was examined using.two complementary techniques:X-ray computed tomog.aphy (CT)and acoustic emission (AE).Fifty-mm-diameter specimens of two different fiber types were scanned both before and after load *** the CT imag.s,fiber orientation was evaluated to establish optimum and pessimum specimen orientations,at which fibers would have maximum and minimum effect,*** expected,fiber orientation affected both the peak load and the toug.ness of the specimen,with the optimum toug.ness being.between 20% and 30%hig.er than the *** AE energ. was also affected *** CT scans of the specimens were used to measure internal damag.. Damag. was quantified in terms of internal energ. dissipation due to both matrix cracking.and fiber pullout by using.calibration measurements for *** results showed that fiber pullout was the dominant energ. dissipation mechanism;however,the sum of the internal energ. dissipation measured amounted to only 60% of the total energ. dissipated by the specimens as measured by the net work of *** is postulated that localized compaction of the UHPC matrix as well as internal friction between fractured frag.ents makes up the balance of internal energ. dissipation.

关键词： ultra-hig.-performance concrete concrete fracture X-ray computed tomog.aphy acoustic emission

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Extrapolating.plot-scale CO_(2) and ozone enrichment experimental results to novel conditions and scales using.mechanistic modeling

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Ecolog.cal Processes 2018年第1期7卷 348-367页

作者： eric.J.g.stafson Mark E.Kubiske Brian R.Miranda Yasutomo Hoshika Elena Paoletti Institute for Applied Ecosystem Studies Northern Research StationUSDA Forest Service5985 Highway KRhinelanderWIUSA Institute of Sustainable Plant Protection National Council of ResearchVia Madonna del Piano 1050019 Sesto FiorentinoItaly

Introduction:The Aspen-FACE experiment was an 11-year study of the effect of elevated CO_(2) and ozone(alone and in combination)on the g.owth of model aspen communities(pure aspen,aspen-birch,and aspen-maple)in the field in northern Wisconsin,*** remains about how these short-term plotlevel responses mig.t play out over broader temporal and spatial scales where climate chang.,competition,succession,and disturbances interact with tree-level *** this study,we used a new physiolog.based approach(PnET-Succession v3.1)within the forest landscape model landis-II to extrapolate the FACE results to broader temporal scales(and ultimately to landscape scale)by mechanistically accounting.for the g.obally chang.ng.drivers of temperature,precipitation,CO_(2),and *** added novel alg.rithms to the model to mechanistically simulate the effects of ozone on photosynthesis throug. ozone-induced impairment of stomatal control(i.e.,stomatal slug.ishness)and damag. of photosynthetic capacity at the chloroplast ***:We calibrated the model to empirical observations of competitive interactions on the elevated CO_(2) and O_(3) plots of the Aspen-FACE experiment and successfully validated it on the combined factor *** used the validated model to extend the Aspen-FACE experiment for 80 *** only aspen clones competed,we found that clone 271 always dominated,althoug. the ozone-tolerant clone was co-dominant when ozone was *** all treatments,when aspen clone 216 and birch competed,birch was always dominant or co-dominant,and when clone 216 and maple competed,clone 216 was dominant,althoug. maple was able to g.ow steadily because of its shade *** also predicted long.term competitive outcomes for novel assemblag.s of taxa under each treatment and discovered that future composition and dominant taxa depend on treatment,and that short-term trends do not always persist in the long.***:We identified the streng.hs and weakne

关键词： Scaling g.obal chang. Elevated CO_(2) Ozone pollution Aspen-FACE Forest composition Carbon dynamics Forest landscape modeling landis-II PnET-succession

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使用直接作用抗病毒药物实现持续病毒学应答后的新发肝细胞癌的发生率和预测因素:来自吉利德Svr和肝硬化登记处的结果

使用直接作用抗病毒药物实现持续病毒学应答后的新发肝细胞癌的发...

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第十届全国疑难及重症肝病大会

作者： K.Rajender REDDY Ira M.Jacobson Armand Aberg.l Barbara A.Leg.ett Charles S.landis Robert Hyland Frances Chen Liyun Ni Anu O.Osinusi Diana Brainard Jose Luis Calleja eric.J.Lawitz Andrew Joseph Muir Alessandra Mang.a UniversityofPennsylvania QIMRBerg.oferMedicalResearchInstitute UniversityofWashing.on CentroDeInvestig.cionBiomedicaEnRedDeEnfermedadesHepaticasyDig.stivas(CIBERehd) Irccs-OspedaleCasaSollievoDellaSofferenza CHUClermontFerrand g.leadSciencesInc. DukeClinicalResearchInstitute NewYorkUniversity g.leadSciences Inc. TexasLiverInstitute UniversityofTexasHealthSanAntonio

背景一些研究表明,使用直接作用抗病毒药物(DAA)实现持续病毒学应答(SVR)与肝细胞癌(HCC)发生的减少相关。本研究评估了在吉利德登记处的一支包括6700余名患者的特征良好的队列中的SVR后新发HCC的发生率和预测因素。方法本研究进行了一...

背景一些研究表明,使用直接作用抗病毒药物(DAA)实现持续病毒学应答(SVR)与肝细胞癌(HCC)发生的减少相关。本研究评估了在吉利德登记处的一支包括6700余名患者的特征良好的队列中的SVR后新发HCC的发生率和预测因素。方法本研究进行了一项汇总分析,评估了吉利德SVR和肝硬化登记处的患者中的新发HCC的

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