An analytical solution for the multidimensional degradation of a packed bed thermocline

A multidimensional, time-dependent model of the thermocline degradation in a packed bed thermal storage tank is presented. The formulation includes the effects of finite tank length, multidimensional thermal conduction, heat transfer between the fluid and solid portions of the bed, and heat losses across all tank surfaces. The technique used to solve the coupled pair of parabolic partial differential equations describing the degradation of the thermocline is based on a vectorized separation of variables approach. Assuming cylindrical geometry, the analysis leads to separate eigenvalue problems for the radial, angular, and axial spatial dependencies of the fluid and solid temperatures in the bed. The eigenvalues are readily calculated and the corresponding eigenfunctions are shown to form a complete set of spatial basis functions for the solution space. The method and results are illustrated by several examples.     

A replication of a survey of school psychologists: Congruence between training,practice, preferred role,and competence

The present study is a replication of an earlier effort by Meacham and Peckham (1978) that surveyed practicing school psychologists to obtain their perceptions regarding the congruency between the role functions of assessment, interpretation, remediation, consultation, change agent, and research and training, present job, preferred job, and competence. Overall, results indicate a greater congruency between the training and practice of school psychologists. Other findings are discussed in terms of their implications for the training and practice of school psychology.     

Concurrent Validity of the standard progressive matrices for Hispanic and nonHispanic and seventh-grade students

Correlations between the Standard Progressive Matrices test (SPM) and the California Achievement Test, Reading, Language, and Mathematics Tests were examined for 99 Hispanic and 93 nonHispanic Caucasian seventh-grade students in the Southwest. All correlations were highly significant, indicating concurrent validity of the SPM. Correlations computed separately for Hispanic and nonHispanic students also were compared; those differences were not significant. This evidence supports the continued use of the SPM as a measure of nonverbal intellectual ability for Hispanic and nonHispanic students.