Intra-well and cross-well chaos in membranes and shells liable to buckling

Nonlinear Dynamics - This work presents the mathematical modeling for the nonlinear vibration analysis of membrane and shell structures of arbitrary shape. These structures are usually the optimal...     

Projecting the Bethe�CSalpeter Equation onto the Light-Front and Back: A Short Review

The technique of projecting the four-dimensional two-body Bethe?CSalpeter equation onto the three-dimensional Light-Front hypersurface, combined with the quasi-potential approach, is briefly illustrated, by placing a particular emphasis on the relation between the projection method and the effective dynamics of the valence component of the Light-Front wave function. Some details on how to construct the Fock expansion of both (a) the Light-Front effective interaction and (b) the electromagnetic current operator, satisfying the proper Ward?CTakahashi identity, will be presented, addressing the relevance of the Fock content in the operators living onto the Light-Front hypersurface. Finally, the generalization of the formalism to the three-particle case will be outlined.     

Memetic self-adaptive evolution strategies applied to the maximum diversity problem

The maximum diversity problem consists in finding a subset of elements which have maximum diversity between each other. It is a very important problem due to its general aspect, that implies many practical applications such as facility location, genetics, and product design. We propose a method based on evolution strategies with local search and self-adaptation of the parameters. For all time limits from 1 to 300 s as well as for time to converge to the best solutions known, this method leads to better results when compared to other state-of-the-art algorithms.     

Characterizing gonality for two-component stable curves

Geometriae Dedicata - It is a well-known result that a stable curve of compact type over $${\mathbb {C}}$$ having two components is hyperelliptic if and only if both components are hyperelliptic...     

Heavy Meson Decay in Three-Mesons and FSI

The final state interaction contribution to charged D decay into \({K \pi \pi}\) is computed within a light-front framework, considering S-wave \({K\pi}\) interactions in 1/2 and 3/2 isospin states. The convergence of the rescattering series is checked computing terms up to the third perturbative order. The role of the resonances above \({K^*_0(1430)}\) , and the contribution of the \({K\pi 3/2}\) isospin channel to charged three-body D decays, are studied against the available phase-shift analysis.     

Oxygen‐Dependent Photochemistry and Photophysics of “MiniSOG,” a Protein‐Encased Flavin

Selected photochemical and photophysical parameters of flavin mononucleotide (FMN) have been examined under conditions in which FMN is (1) solvated in a buffered aqueous solution, and (2) encased in a protein likewise solvated in a buffered aqueous solution. The latter was achieved using the so‐called “mini Singlet Oxygen Generator” (miniSOG), an FMN‐containing flavoprotein engineered from Arabidopsis thaliana phototropin 2. Although FMN is a reasonably good singlet oxygen photosensitizer in bulk water (?_Δ = 0.65 ± 0.04), enclosing FMN in this protein facilitates photoinitiated electron‐transfer reactions (Type‐I chemistry) at the expense of photosensitized singlet oxygen production (Type‐II chemistry) and results in a comparatively poor yield of singlet oxygen (?_Δ = 0.030 ± 0.002). This observation on the effect of the local environment surrounding FMN is supported by a host of spectroscopic and chemical trapping experiments. The results of this study not only elucidate the behavior of miniSOG but also provide useful information for the further development of well‐characterized chromophores suitable for use as intracellular sensitizers in mechanistic studies of reactive oxygen species.     

Ring Contraction Through Epoxide Rearrangement: A Formal Synthesis of Capsorubin

An eight-step synthesis of the cyclopentane keto-alcohol 2, which has previously been converted in one step into the carotenoid pigment capsorubin (1), is described. The key step in our synthesis is a stereospecific epoxide rearrangement with ring contraction, thus producing the cyclopentane ring from an epoxide of a cyclohexene.     

Reduced‐bias kernel estimators of a positive extreme value index

In this paper, we deal with the semi‐parametric estimation of the extreme value index, an important parameter in extreme value analysis. It is well known that many classic estimators, such as the Hill estimator, reveal a strong bias. This problem motivated the study of two classes of kernel estimators. Those classes generalize the classical Hill estimator and have a tuning parameter that enables us to modify the asymptotic mean squared error and eventually to improve their efficiency. Since the improvement in efficiency is not very expressive, we also study new reduced bias estimators based on the two classes of kernel statistics. Under suitable conditions, we prove their asymptotic normality. Moreover, an asymptotic comparison, at optimal levels, shows that the new classes of reduced bias estimators are more efficient than other reduced bias estimator from the literature. An illustration of the finite sample behaviour of the kernel reduced‐bias estimators is also provided through the analysis of a data set in the field of insurance.     

Gamma radiation, cold and four different wrappings to preserve ginger rhizomes, Zingiber officinallis Roscoe

After irradiating with a single dose of 50 Gy, ginger rhizomes were dipped into paraffin for coating, wrapped in a plastic film of low-density polyethylene, on perforated or non-perforated polivinyl chloride film, and compared with non-wrapping and non-irradiation as the controls. After treatments the rhizomes were maintained refrigerated at 13°C and 80% relative humidity. As a main result it could be observed that dipping into paraffin and wrapping with plastics resulted in smaller weight loss of the rhizomes.