19 research outputs found
Theory of strongly correlated f and d-electron systems. I. Exact Hamiltonian, Hubbard-Anderson models and perturbation theory near atomic limit within non-orthogonal basis set
The theory of correlated electron systems is formulated in a form which
allows to use as a reference point an ab initio band structure theory (AIBST).
The theory is constructed in two steps. As a first step the total Hamiltonian
is transformed into a correlated form. In order to elucidate the microscopical
origin of the parameters of the periodical Hubbard-Anderson model (PHAM) the
terms of the full Hamiltonian which have the operator structure of PHAM are
separated. It is found that the matrix element of mixing interaction includes
ion-configuration and number-of-particles dependent contributions from the
Coulomb interaction. In a second step the diagram technique (DT) is developed
by means of generalization of the Baym-Kadanoff method for correlated systems.Comment: 40 pages, 6 figure
A systematic examination of the bone destruction pattern of the two-shot technique
Introduction: The two-shot technique is an effective stopping power method. The precise mechanisms of action on the bone and soft-tissue structures of the skull; however, remain largely unclear. The aim of this study is to compare the terminal ballistics of the two-shot and single-shot techniques. Materials and Methods: 40 fresh pigs′ heads were randomly divided into 4 groups (n = 10). Either a single shot or two shots were fired at each head with a full metal jacket or a semi-jacketed bullet. Using thin-layer computed tomography and photography, the diameter of the destruction pattern and the fractures along the bullet path were then imaged and assessed. Results: A single shot fired with a full metal jacket bullet causes minor lateral destruction along the bullet path. With two shots fired with a full metal jacket bullet, however, the maximum diameter of the bullet path is significantly greater (P < 0.05) than it is with a single shot fired with a full metal jacket bullet. In contrast, the maximum diameter with a semi-jacketed bullet is similar with the single-shot and two-shot techniques. Conclusion: With the two-shot technique, a full metal jacket bullet causes a destruction pattern that is comparable to that of a single shot fired with a semi-jacketed bullet