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"Dalam penelitian ini dipelajari solusi eksak (soliton) dari medan skalar yang memiliki simetri diskret, yaitu kink atau domain wall. Untuk mencari solusi eksak tersebut, kami menggunakan metode Bogolmonyi untuk mereduksi persamaan gerak Euler-Lagrange yang berorde dua menjadi persamaan differensial orde satu, sehingga terbentuklah persamaan Bogolmonyi. Solusi didapat dengan menggunakan fungsi superpotensial untuk mencari energi total. Solusi yang didapat dinamakan dengan solusi BPS (Bogolmonyi-Prasad-Sommerfield). Penelitian ini bertujuan untuk mencari solusi BPS dari kink atau domain wall untuk beberapa jenis potensial.

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In this research we study the exact solution (soliton) of the scalar field that has discrete symmetry, kink or domain wall. To find the exact solution, we use the Bogolmonyi method to reduce the second order Euler-Lagrange equation of motion to a first-order one. The solution can be obtained by using superpotential function, from which the total energy density can be derived. The obtained solution is called the BPS solution (Bogolmonyi-Prasad-Sommerfield). This research is aimed to find the BPS solution of the kink or domain wall for various kinds of potentials."

"The aim of this book is to present highly accurate and extensive theoretical atomic data and to give a survey of selected calculational methods for atomic physics, used to obtain these data. The book presents the results of calculations of cross sections and probabilities of a broad variety of atomic processes with participation of photons and electrons, namely on photoabsorption, electron scattering and accompanying effects. Included are data for photoabsorption and electron scattering cross-sections and probabilities of vacancy decay formed for a large number of atoms and ions. Attention is also given to photoionization and vacancy decay in endohedrals and to positron-atom scattering. The book is richly illustrated. The methods used are one-electron Hartree-Fock and the technique of Feynman diagrams that permits to include many-electron correlations. This is done in the frames of the Random Phase approximation with exchange and the many-body perturbation theory. Newly obtained and previously collected atomic data are presented. The atomic data are useful for investigating the electronic structure and physical processes in solids and liquids, molecules and clusters, astronomical objects, solar and planet atmospheres and atomic nucleus. Deep understanding of chemical reactions and processes is reached by deep and accurate knowledge of atomic structure and processes with participation of atoms. "