1,726,233 research outputs found
Probabilistic Comparative Analysis of Vehicle-Bridge Interaction Models for Predicting Bridge Response under Moving Vehicles
No full textThis paper compares three approaches for predicting the bridge response under moving vehicles. The first approach represents the vehicle as a concentrated moving load, while the second and third approaches simulate the vehicle using single (1-dof) and two (2-dof) degrees of freedom models, respectively. The vehicle-bridge models have been implemented following a finite-difference formulation. These models have been validated against the experimental displacement response of a mid-span prestressed reinforced concrete bridge. Parametric analyses have been conducted to investigate the impact of road roughness on the discrepancies between the models' predictions. An increasing level of road roughness, modeled according to ISO-8608, tends to conceal the mutual differences between the models' outcomes. Furthermore, a Monte Carlo simulation has been employed to fit the probability distributions of two indicators, comparing the bridge displacement responses in three roughness scenarios and considering variable velocity and vehicle characteristics. The primary objective is to assess whether there are scenarios where vehicle-bridge interaction modeling becomes indispensable for accurately estimating the vehicle's effect on the bridge response. The paper presents expressions for four probability density functions of the chosen metric, facilitating the comparison between the 1-dof and 2-dof models with the concentrated load approach
Measurement of G(phi -> eta' gamma)/G(phi -> eta gamma) and the pseudoscalar mixing angle
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The hadronic cross section measurement at KLOE
No full textKLOE uses the radiative return to measure cross section σ(e+e- → π+ π-γ) at the electron-positron collider DAΦNE. Divinding by a theoretical radiator function, we obtain the cross section σ(e+e- → π+ π-γ) for the mass range 0.35 < sπ < 0.95 GeV2. We calculate the hadronic contribution to the muon anomaly for the given mass range: aμ = 388.7 ± 0.8stat ± 3.5syst ± 3.5th
Protocol-independent, fixed-latency links with FPGA-embedded SerDeses
No full textMost high-speed Serializer-Deserializer (SerDes) chips have a random latency through the data-path each time the link is established (e.g. after a reset, a loss of signal or a power cycle). However, there are fields of applications, such as timing synchronization, radio equipment control and trigger systems of High Energy Physics experiments that would benefit from fixed-latency links. In this paper, we present a link architecture based on high-speed SerDeses circuits embedded in Field Programmable Gate Array (FPGAs). Our architecture works with fixed-latency, it is independent of the protocol and can be customized to support any. As an example of implementation, we report on a synchronous 2.5-Gbps 8B10B serial link. © 2012 IOP Publishing Ltd and Sissa Medialab srl
Reliability-based overstrength factors of cross-laminated timber shear walls for seismic design
No full textThe ductile collapse mechanisms of structures should be less resistant than the brittle mechanisms to ensure a ductile seismic response: in this way, the ductile mechanisms activate before the brittle ones. This sort of chronological law of collapse is obtained in the design phase by providing a proper ”overstrength” to the brittle mechanisms. The realization of overstrength plays a crucial role in the design, and several studies endeavoured to estimate the best overstrength factors, defined as the ratio between the characteristic load-carrying capacity of the non-ductile element and the characteristic load-carrying capacity of the ductile element. In this paper, the conventional definition of overstrength is discussed and compared to a probabilistic definition based on reliability methods. The probabilistic definition of overstrength drives the assessment of the overstrength factors of Cross-Laminated Timber buildings using a sort of indirect approach. The Extended-Energy dependent generalized Bouc-Wen model is used to estimate the nonlinear seismic response of a set of Cross-Laminated Timber shear walls with different ductility. The results are compared with the existing formulations, attempting to draw correlations possibly useful in the design phase
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