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Optimal cross-section and configuration design of cyclic loaded elastic-plastic structures
Valido, Anibal J.,Sousa, Luis G.,Cardoso, J. Barradas Techno-Press 1996 Structural Engineering and Mechanics, An Int'l Jou Vol.4 No.1
This paper describes a continuum variational formulation for design optimization of nonlinear structures in the elastic-plastic domain, where unloading and reloading of the structures are allowed to occur. The Total Lagrangian procedure is used for the description of the structural deformation. The direct differentiation approach is used to derive the sensitivities of the various structural response measures with respect to the design parameters. Since the material goes into the inelastic range and unloading and reloading of the structure are allowed to occur, the structural response is path dependent and an additional step is needed to integrate the constitutive equations. It can be shown, consequently, that design sensitivity analysis is also path-dependent. The theory has been discretized by the finite element technique and implemented in a structural analysis code. Mathematical programming approach is used for the optimization process. Numerical applications on trusses are performed, where cross-sectional areas and nodal point coordinates are treated as design variables. Optimal designs have been obtained and compared by using two different strategies: a two level strategy where the levels are defined accordingly the type of design variables, cross sectional areas or node coordinates, and optimizing simultaneously with respect to both types of design variables.
Approximating vibronic spectroscopy with imperfect quantum optics
Clements, William R,Renema, Jelmer J,Eckstein, Andreas,Valido, Antonio A,Lita, Adriana,Gerrits, Thomas,Nam, Sae Woo,Kolthammer, W Steven,Huh, Joonsuk,Walmsley, Ian A IOP 2018 Journal of physics B, Atomic, molecular, and optic Vol.51 No.24
<P>We study the impact of experimental imperfections on a recently proposed protocol for performing quantum simulations of vibronic spectroscopy. Specifically, we propose a method for quantifying the impact of these imperfections, optimizing an experiment to account for them, and benchmarking the results against a classical simulation method. We illustrate our findings using a proof of principle experimental simulation of part of the vibronic spectrum of tropolone. Our findings will inform the design of future experiments aiming to simulate the spectra of large molecules beyond the reach of current classical computers.</P>