ABSTRACT
We propose a practical scheme for calculating the pair density (PD) on the basis of the density functional theory. In order to avoid the N-representability problem of the PD, we implement the variational principle within the set of PDs that are constructed from the single Slater determinants (SSDs). For the kinetic energy functional, we utilize the approximate form that is developed by means of the electron-coordinate scaling laws. The variational principle results in the simultaneous equations for constituent orbitals of the SSD. It yields the best one within the SSD-representable PDs.
ABSTRACT
Spontaneous pneumothorax in pregnancy is said to be a rare condition. A 37-year-old woman at 13 weeks' gestation with this rare complication, was reported. The patient was first treated by chest tube drainage, which failed to get complete reexpansion of the lung, and she was managed by thoracotomy twenty days after. She delivered, at full term, a healthy normal infant by cesarean section. Indications for operative treatment of pneumothorax in pregnancy, in general, are not absolutely defined. We believe that the usually accepted indications for operation, such as persistence of air leakage despite adequate drainage and multiple recurrences of pneumothorax, are valid during pregnancy, if the patient allows the pregnancy to proceed.
