Ionic liquid matrices for MALDI mass spectrometry of lignin

Analytical and Bioanalytical Chemistry - The use of matrix-assisted laser desorption/ionization (MALDI) mass spectrometry for the study of lignin is still extremely limited due to its low...     

Electromagnetoelastic problem for a plate with holes and cracks

The methods of complex potentials, conformal mappings, and least squares are used to solve a plane problem of electromagnetoelasticity for a plate with holes and cracks. Numerical solutions are found for a ring and a disk with a crack under internal concentrated forces or electric charges as well as electric potentials applied to the boundaries     

Thermoelectroelastic state of a multiply connected anisotropic plate

Generalized complex potentials in a plane problem of thermoelectroelasticity are introduced. Expressions for the basic characteristics of the thermoelectroelastic state are derived. Boundary conditions for determining the complex potentials and the general form of these functions for a multiply connected plate are obtained. The potentials are used to solve a specific problem __________ Translated from Prikladnaya Mekhanika, Vol. 41, No. 11, pp. 116–126, November 2005.     

Electromagnetoelastic problem for an infinite plate with known electrical potentials at hole boundaries

The plane electromagnetoelastic problem for an infinite plate with cracks and holes for known electrical potentials at the boundaries of the cracks and holes is solved using generalized complex potentials and conformal mapping, series, and least squares methods. The electromagnetoelastic state and variation of the stress intensity coefficient versus the geometric and physicomechanical properties of the material was studied for plates with two circular holes, a crack and a circular hole, or two cracks.     

The two-dimensional electroelasticity problems for multiconnected bodies situated under electric potential difference action

Solutions of the two-dimensional electroelasticity problems for infinitely long piezoelectric cylinders with cavities and cracks under electrical potential difference action are obtained using the Lekhnitskii’s generalized complex potentials. Herewith, piezoelectric bodies under consideration are free from mechanical loads, some (or all) openings and maybe the exterior boundary of the cylinders are fully covered by thin electrodes. Voltage differences are supplied on the electroded surfaces, the rest boundary surfaces are charge-free. In this case, the complex potentials are investigated. Boundary conditions are satisfied by the least-squares method. There are carried out numerical investigations of behaviour of some basic electroelastic characteristics in a circular hollow cylinder and in an infinite body with two longitudinal cavities and a charge-free plane crack. New electromechanical regularities of influence of material properties, geometrical characteristics of considered regions on values of electroelastic state characteristics and the stress, electric displacements and tensions intensity factor $k_1$ are determined.     

Electroelastic State of a Piezoelectric Half-Space with Holes and Cracks Under an Electric Field

International Applied Mechanics - The two-dimensional problem of electroelasticity for a piezoelectric half-space with cylindrical cavities and plane cracks under a distant electric field is...     

Rotationally resolved electronic spectroscopy of a nonlinear carbon chain radical C6H4

Rotationally resolved electronic spectrum of the origin band in the 2A″-X2A″ transition of a nonlinear carbon chain radical C₆H₄⁺ has been recorded in the 604 nm region using cw cavity ring down spectroscopy. The radical was produced by a discharge through an acetylene-helium mixture in a supersonic planar expansion. The rotational structure has been analysed and precisely determined. A band having a-type prolate rotational structure has also been observed near 581 nm. By considering the results of ab initio calculations this band is assigned to a transition involving the excitation of the ν₁₂ fundamental in the upper 2A″ electronic state of the same C₆H₄⁺ isomer.     

Electroelastic state of an infinite multiply connected piezoelectric plate with known electric potentials applied to its boundaries

Generalized complex potentials, their expressions for a domain with elliptic holes, and the discrete least-squares method are used to analyze the generalized plane electroelastic state of a piezoelectric plate having holes and cracks with electric potentials applied to their boundaries. There are no mechanical loads. A numerical analysis is conducted. The effect of the applied voltage on the electroelastic state of the plate is examined