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Amplification Factor

The Experts below are selected from a list of 279 Experts worldwide ranked by ideXlab platform

Ahmed Maarouf – 1st expert on this subject based on the ideXlab platform

  • Deflection Amplification Factor for Seismic Design Provisions
    Journal of Structural Engineering-asce, 1994
    Co-Authors: Chia-ming Uang, Ahmed Maarouf

    Abstract:

    Seismic design provisions estimate the maximum roof and story drifts occurring in major earthquakes by amplifying the drifts computed from elastic analysis at the prescribed design seismic force level with a deflection Amplification Factor (DAF). A comparison of several seismic design provisions indicated that the deflection Amplification Factor in both the UBC and NEHRP Recommended Provisions, being equal to 3Rw/8 and Cd, respectively, is very low and could lead to unconservative drift estimations. An analytical study of the seismic responses of four instrumented buildings confirmed that drifts developed in major earthquakes are much higher than those predicted by the UBC or NEHRP approach. It is recommended that the deflection Amplification Factor be increased to at least the seismic force reduction Factor (Rw in UBC and R in NEHRP) for estimating maximum drifts. The effects of the ratio between building period and earthquake predominant period, types of yield mechanisms, and structural overstrength on …

  • Displacement Amplification Factor for Seismic Design Provisions
    Structural Engineering in Natural Hazards Mitigation, 1993
    Co-Authors: Chia-ming Uang, Ahmed Maarouf

    Abstract:

    To estimate the maximum roof and story drifts occurring during severe earthquakes, the UBC and NEHRP use 3R w /8 and C d respectively as the displacement Amplification Factor (DAF) to amplify elastic design drifts. A comparison of several seismic design codes shows that both the UBC and NEHRP’s DAF are very low. A study conducted on seismic response of four instrumented buildings indicates that maximum drifts developed in severe earthquakes are much higher than those predicted by UBC and NEHRP. Recommended DAF values for building frames are presented.

K. Chung – 2nd expert on this subject based on the ideXlab platform

  • Tube diameter effect on deflagration-to-detonation transition of propane–oxygen mixtures
    Shock Waves, 2006
    Co-Authors: J. Li, K. Chung

    Abstract:

    An experimental study was conducted to study the tube diameter effect on deflagration- to-detonation run-up distance. The tube diameter effect is associated with the Amplification Factor, flame acceleration and heat loss. A simplified correlation of the run-up distance and tube diameter is proposed for the fuel-lean, stoichiometric and slight fuel-rich mixtures. The Amplification Factor, which is evaluated from the initial conditions of the propane–oxygen mixtures, might also be used to get a quick estimation of the run-up distance in tubes of larger diameter.

  • tube diameter effect on deflagration to detonation transition of propane oxygen mixtures
    Shock Waves, 2006
    Co-Authors: J. Li, K. Chung

    Abstract:

    An experimental study was conducted to study the tube diameter effect on deflagration- to-detonation run-up distance. The tube diameter effect is associated with the Amplification Factor, flame acceleration and heat loss. A simplified correlation of the run-up distance and tube diameter is proposed for the fuel-lean, stoichiometric and slight fuel-rich mixtures. The Amplification Factor, which is evaluated from the initial conditions of the propane–oxygen mixtures, might also be used to get a quick estimation of the run-up distance in tubes of larger diameter.

David J. Love – 3rd expert on this subject based on the ideXlab platform

  • On the Optimal Delay Amplification Factor of Multi-Hop Relay Channels
    2019 IEEE International Symposium on Information Theory (ISIT), 2019
    Co-Authors: Dennis Ogbe, Chih-chun Wang, David J. Love

    Abstract:

    The abstract model of the multi-hop relay channel is fundamental to a vast variety of modern communication systems. This fact, coupled with the demand for ultra-reliable-low-latency communication (URLLC), motivates a new investigation of relay channels from a delay-vs-throughput perspective. This work seeks to analyze this tradeoff in the regime of asymptotically large, yet still finite delay. A new metric called the Delay Amplification Factor (DAF) is introduced, which allows analytic comparison of the asymptotic delay across different relay solutions, e.g. decode-&-forward (DF), compress-&-forward, etc. The optimal DAF (over all possible existing/future designs) is then characterized for two special settings, one with fixed-length coding and one with variable-length coding and 1-bit stop feedback. The results show that under some general conditions, the optimal end-to-end delay over an L-hop line network is asymptotically comparable to the delay over the single bottleneck hop, and it does not grow linearly with respect to L. The linearly growing delay penalty commonly encountered in DF and other schemes is thus an artifact rather than a fundamental limit of multi-hop relay communication.