background : this study compared the efficacy of two commonly used fractionation schedules for palliative whole brain irradiation in patients with brain metastases, and assessed the association of the radiotherapy therapy oncology group (rtog) recursive partitioning analysis for brain metastases (rpa) to survival with each schedule. methods : patients with multiple (more than three) brain metas...

Henk Eshuis, Julian Yarkony, and Filipp Furche Department of Chemistry, University of California, Irvine, CA 92697, USA (Dated: February 23, 2010) Abstract The random phase approximation (RPA) is an increasingly popular method to compute postKohn-Sham correlation energies, but its high computational cost has limited molecular applications to systems with few atoms so far. Here we present an eff...

Quasi-elastic responses in nuclear matter and in 12C and 40Ca nuclei are calculated in ring approximation to investigate the finite size effects on the electromagnetic quasi-elastic responses. A method to simulate these effects in infinite systems calculations is proposed. The sensitivity of the results to the various terms of the residual interaction is studied. The results of nuclear matter R...

Large-scale QRPA calculations of the E1 strength are performed on top of HFB calculations in order to derive the radiative neutron capture cross sections for the whole nuclear chart. The spreading width of the GDR is taken into account by analogy with the second-RPA (SRPA) method. The accuracy of HFB+QRPA model based on various Skyrme forces with different pairing prescription and parameterizat...

Theoretical results for giant resonances in the three doubly magic exotic nuclei Ni, Sn and Sn are obtained from Hartree-Fock (HF) plus Random Phase Approximation (RPA) calculations using the D1S parametrization of the Gogny two-body effective interaction. Special attention is paid to full consistency between the HF field and the RPA particle-hole residual interaction. The results for the exoti...

Double, Rydberg, and charge transfer (CT) excitations have been great challenges for time-dependent density functional theory (TDDFT). Starting from an (N ± 2)-electron single-determinant reference, we investigate excitations for the N-electron system through the pairing matrix fluctuation, which contains information on two-electron addition/removal processes. We adopt the particle-particle ran...

This Perspective reviews recent efforts toward selfconsistent calculations of ground-state energies within the random phase approximation (RPA) in (generalized) Kohn–Sham (KS) density functional theory context. Since RPA correlation energy explicitly depends on non-interacting KS potential, an additional condition to determine as a is necessary. observation leads concept selfconsistency (FSC), ...

This research suggests a new robotic system technique that works specifically in settings such as hospitals or emergency situations when prompt action and preserving human life are crucial. Our framework largely focuses on the precise delivery of medical supplies medication inside defined area while avoiding robot collisions other obstacles. The suggested route planning algorithm (RPA) based re...