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| 1 | Comparison of adaptive structural damage identification techniques in nonlinear hysteretic vibration isolation systems显示文摘Early structural damage identification to obtain an accurate condition assessment can assist in the reprioritization of structural retrofitting schedules in order to guarantee structural safety.Nowadays,seismic isolation technology has been applied in a wide variety of infrastructure,such as buildings,bridges,etc.,and the health conditions of these nonlinear hysteretic vibration isolation systems have received considerable attention.To effectively detect structural damage in vibration isolation systems based on vibration data,three time-domain analysis techniques,referred to as the adaptive extended Kalman filter(AEKF),adaptive sequential nonlinear least-square estimation(ASNLSE)and adaptive quadratic sum-squares error(AQSSE),have been investigated.In this research,these analysis techniques are compared in terms of accuracy,convergence and efficiency,for structural damage detection using experimental data obtained through a series of laboratory tests based on a base-isolated structural model subjected to El Centro and Kobe earthquake excitations.The capability of the AEKF,ASNLSE and AQSSE approaches in tracking structural damage is demonstrated and compared. | Mu Tengfei Zhou Li Jann N.Yang | 2013 | Earthquake Engineering and Engineering Vibration2013，12，4： | 3 |
| 2 | Supplemental Chromium Picolinate Promotes Growth of Broiler Chickens by Enhancing Insulin Receptor Gene Expression显示文摘Chromium has been recognized for decades as a nutritional factor that promotes the growth of broiler chickens,but the molecular mechanism is still not clearly understood.The present study was designed to investigate the physiological and molecular mechanisms of the effects of supplemental chromium picolinate on the growth of broiler chickens.A total of 144 21-day-old Arbor Acres male broiler chicks were randomly divided into a control and an experimental group.The control group was fed a basal diet,and the experimental group was fed the same basal diet supplemented with 200 μg/kg chromium picolinate.The experiment lasted for three weeks from day 28 to 42 of the birds..Supplementation with 200 μg/kg chromium picolinate significantly increased body weight (P < 0.05).Serum insulin levels in chickens of the experimental group were increased significantly (P < 0.05),whereas serum glucose concentrations were decreased (P < 0.05).No significant changes were observed in serum lipid profiles in chickens fed the diet supplemented with chromium picolinate.Gene expression levels of the insulin receptor (IR) and insulin receptor substrate 1 (IRS-1),two pivotal components of the insulin signaling pathway,were also investigated using Real-time quantitative PCR.IR expression was significantly (P < 0.05) increased following chromium supplementation.Therefore,supplemental chromium picolinate had a beneficial effect on the growth of broilers.In agreement with observations in mammals,chromium might exert its effect via potentiating insulin action,and ultimately by stimulating anabolism without altering body composition in chickens. | Z.Z.Liu G.Q.Wu J.X.Zheng J.Y.An N.Yang G.Y.Xu | 2010 | Journal of Animal Science and Biotechnology2010，1，1： | 1 |
| 3 | Micro—structural analysis of YBa2Cu3O7—x thin films grown on different substrates by X—ray techniques显示文摘YBa2Cu3Ox(YBCO) thin films grown on different substrates with and/or without Eu2CuO4(ECO) buffer layer were investigated by X-ray wide angle diffraction,reflection,diffuse scattering and topography.Theresults show that for the yttria stabilized ZrO2(YSZ) substrate,the presence of an ECO buffer layer improves the crystalline quality of the YBCO film,while a negative effect is observed for the SrTiO3(STO) substrate.The lateral correlation length for a sample grown on a YSZ substrate with ECO buffer Layer is much greater than grown on an STO subetrate.The STO substrate used has mosaic structure.2001 Elsevier Science B.V.All rights reserved. | C.X.Liu M.Xu W.H.Tang X.M.Chen L.S.Wu N.Yang Z.H.Mai K.Tao J.G | 2001 | Beijing Synchrotron Radiation Facility2001，，2： | 0 |
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