52 research outputs found

    Mixed Boundary Value Problems of the Fourth Kind in an Enhanced Theory of Bending of Elastic Plates

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    The real boundary integral equation method is used to solve a specific type of mixed boundary value problem in an enhanced theory of bending of elastic plates with transverse shear deformation and transverse normal strain. This type of problem (often referred to as a mixed problem of the fourth kind) is characterized by the fact that a combination of the twisting displacement rotations and transverse shear force is prescribed on the curve which bounds the middle surface of the plate. Both interior and exterior problems are formulated and the corresponding existence and uniqueness results derived. </jats:p

    Optical properties of gas-phase tryptophan-silver cations : charge transfer from the indole ring to the silver atom

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    International audienceWe present a joint experimental and theoretical investigation of the electronic excitation spectra of the tryptophan-silver complex. The photodissociation spectrum of gas-phase [Trp-Ag]+ was measured from 215 to 330 nm using a quadrupole ion trap coupled to an optical parametric-oscillator laser. The calculated time-dependent density functional theory (TD-DFT) absorption spectra for different prototypes of structures are presented. Low-energy transitions that are experimentally observed are only calculated for the charge-solvation (CS) structures. These transitions are a signature of the metal- interaction in [Trp-Ag]+. The recorded spectrum is compared to a Boltzmann average of the absorption spectrum obtained from direct molecular dynamics (MD) simulations involving simultaneous transitions to excited states based on semiempirical configuration interaction (CI) calculations. The results demonstrate that charge transfer can be photoinduced from the indole ring to the silver atom
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