RESUMO
The time-dependent Hartree-Fock (TDHF) vertex of many-body perturbation theory (MBPT) makes it possible to extend TDHF theory to charged excitations. Here we assess its performance by applying it to spherical atoms in their neutral electronic configuration. On a theoretical level, we recast the TDHF vertex as a reducible vertex, highlighting the emergence of a self-energy expansion purely in orders of the bare Coulomb interaction; then, on a numerical level, we present results for polarizabilities, ionization energies (IEs), and photoemission satellites. We confirm the superiority of THDF over simpler methods such as the random phase approximation for the prediction of atomic polarizabilities. We then find that the TDHF vertex reliably provides better IEs than GW and low-order self-energies do in the light-atom, few-electron regime; its performance degrades in heavier, many-electron atoms instead, where an expansion in orders of an unscreened Coulomb interaction becomes less justified. New relevant features are introduced in the satellite spectrum by the TDHF vertex, but the experimental spectra are not fully reproduced due to a missing account of nonlinear effects connected to hole relaxation. We also explore various truncations of the self-energy given by the TDHF vertex, but do not find them to be more convenient than low-order approximations such as GW and second Born (2B), suggesting that vertex corrections should be carried out consistently both in the self-energy and in the polarizability.
RESUMO
A coleta de dados é fundamental para todo o processo de enfermagem, constituindo o alicerce no qual se baseiam as etapas seguintes. O objetivo deste trabalho foi validar um instrumento de coleta de dados eelaborar um roteiro instrucional para a utilização deste pelos enfermeiros da Unidade Coronária (Ucor). METODOLOGIA: a técnica de entrevista utilizada, foi a de grupo focal, constituído de cinco enfermeiros com experiência nessa unidade há mais de um ano. Foram realizadas quatro reuniões, as quais foram gravadas, transcritas e analisadas. Na primeira reunião foi apresentado o projeto, esclarecido as dúvidas e entregue o instrumento de coleta de dados da Ucor para teste em cinco pacientes, para cada um dos enfermeiros. Na segunda e terceira reunião, houve a discussão do instrumento pelo grupo, item por item, modificando ou permanecendo aquilo que era de comum acordo entre todos. RESULTADO: no último encontro, foi apresentada a versão final do instrumento e o guia de orientação e preenchimento do mesmo para validação. CONCLUSÃO: a validação clínica deste instrumento de coleta de dados da Ucor se concretizará por meio da sua utilização diária por todos os enfermeiros.
Data collection is critical for all nursing processes. It is the key stone in which all the further stages are basedon. The aim of this study was to validate the data collection instrument and to elaborate a guideline to beused by the nurses working at the Coronary Unit (Ucor). METHODOLOGY: A group of five experienced coronary unit nurses were interviewed using the focus group interview technique; all nurses had one or more years of experience in the unit. The four meetings held were recorded, transcribed and analyzed. In the first meeting, the project was introduced, doubts were solved and the data collection instrument to be tested infive patients of Ucor was given to the nurses. On the following meetings, all the items of the instrument were discussed and modified if the group considered it necessary. RESULT: In the last meeting, the final versionof the instrument and its guidance and fulfillment guide were presented to be validated. CONCLUSION: The clinical validation of this Ucor data collection instrument will be achieved through nurses daily usage.