Small carbon clusters C, C2 and C3 metallized with beryllium were studied by first principles within the hybrid density functional approach with generalized gradient correction. Cluster isomer structures for the ground state and several excited states where systematically calculated for CxBey with x = 1–3 and y = 1–4 including the vibrational analysis of all states. Ionization potentials and el...

in this paper, a nonlinear free vibration analysis of thin annular functionally graded (fg) plate integrated with two uniformly distributed actuator layers made of piezoelectric (pzt4) material on the top and bottom surfaces of the annular fg plate is presented based on kirchhoff plate theory. the material properties of the fgm core plate are assumed to be graded in the thickness direction acco...

background: nowadays, the concept of family planning has been detached from the population control and it is expressed as an essential element in women’s reproductive rights, empowering them and promoting their status in society. family planning services have an important role in fertility decisions using contraception methods in women. this study was carried out to explore the experience of wo...

We find it absurd that Walliser [1] essentially used the same analysis and obtained identical results as reported in [3], yet arrived at different conclusions. Namely, based on an incomplete theory and using erroneous arguments , he not only disputes the original results [2], but also claims them wrong. A more complete theory and much more detailed studies were published in [3], from which we c...

We present a density-functional theory for binary mixtures of amphiphiles with solvent, placing particular emphasis on the structure and free energy of stable and metastable clusters of amphiphiles in dilute solution. These correspond to micelles ~complexes of amphiphiles with the solvophobic groups clustered in the interior! and vesicles ~spherical complexes with bilayer membranes of amphiphil...

This paper outlines an energy-minimization finite-element approach to the computational modeling of equilibrium configurations for nematic liquid crystals under free elastic effects. The method targets minimization of the system free energy based on the Frank-Oseen free-energy model. Solutions to the intermediate discretized free elastic linearizations are shown to exist generally and are uniqu...

This paper outlines an energy-minimization finite-element approach to the computational modeling of equilibrium configurations for nematic liquid crystals under free elastic effects. The method targets minimization of the system free energy based on the Frank-Oseen free-energy model. Solutions to the intermediate discretized free elastic linearizations are shown to exist generally and are uniqu...

In this research paper, the formulation of a new three-dimensional sector element based on the strain approach is presented for plate bending problems and linear static analysis of circular structures. The proposed element has the three essential external degrees of freedom (Ur, Vθ and W) at each of the eight corner nodes. The displaceme...