Showing papers by "Federal University of São Carlos published in 1973"

The physical and mathematical modelling of the flow field in the mold region in continuous casting systems: Part II. The mathematical representation of the turbulent flow field

Abstract: A mathematical representation is developed for the turbulent flow field, temperature field, and tracer distribution in the upper region of the liquid pool in continuous casting. The problem is formulated through the statement of the two-dimensional turbulent flow equa-tions, which were then solved numerically, using the adaptation of a technique described by Spalding and coworkers. The computed results for the velocity fields were found to be in good qualitative agreement with the results of water model studies for both straight and radial flow nozzles. Furthermore, the predictions based on the model for the temperature and tracer profiles within the pool seem to be consistent with expectations.

Plankton Studies in a Mangrove Environment. VIII. Further Investigations on Primary Production, Standing‐Stock of Phyto‐ and Zooplankton and Some Environmental Factors

Abstract: The present paper describes and discusses the seasonal cycle of primary production, standing-stock, climatological and environmental factors, and their interrelationships in a mangrove swamp of the estuarine type (25°S, South Latitude, Cananeia, Brasil). Comparisons with values of primary production for other tropical and temperate environments have been made. Further lines of work are indicated.

Symmetry eigenfunctions suitable for many-electron theories and calculations. I. Mainly atoms

Abstract: An interpretation of degenenate symmetry spaces associated with a given atomic or molecular configuration is presented, and the theory necessary for atomic applications is discussed in detail. Lowdin's symmetric projection operator for spin and orbital angular momentum is applied on a well defined sequence of Slater determinants. In this way a degenerate is space is divided into orthogonal invariant subspaces which can be classified according to internal couplings of angular momentum, A procedure is found which permits expression of each of these LS eigenfunctions as the smallest possible number of successively orthogonalized projected Slater determinants. In particular, minimum size Hartree -Fock interacting spaces (important in rapidly convergent correlation energy calculations) are obtained in their most compact form. An optimum partition of degenerate spaces of three and four excited (atomic or molecular) configurations is obtained in genenal. Interpretations, simplifications, and systematizations in atomic configuration interaction calculations are discussed in light of present results. (auth)