3 pp.

A chemical-isotopic equilibrium model was developed for adjustment of radiocarbon ages of groundwater from the arid Tucson basin for dilution of the initial groundwater C-14 activity by the solution of soil calcite having a C-14 of 25 ± 19% modern. Input to the model consisted of the laboratory chemical analyses for Ca⁺⁺, Mg⁺⁺, Na⁺, H₄SiO₄, SO₄⁼, HCO₃⁻, CO₃⁼, NO₃⁻, and pH, and δ C-13 for the total dissolved carbon in the groundwater. Output consisted of the equilibrium chemical composition of the groundwater, the ratio of soil CO₂ derived to total dissolved carbon, Q, and δ C-13 of total dissolved carbon, H₂CO₃, HCO₃⁻, and CO₃⁼, and δ C-13 for the soil CO₂ and calcite that initially dissolved in the surface water as it equilibrated with soil minerals. Radiocarbon age of the groundwater is computed from the equation T = 8270 ln [(Q + (1-Q) A(CaCO₃)/Am] where T is the age in years before A.D. 1950, A(CaCO₃) is the soil calcite activity and Am is the measured activity for the dissolved carbonate in the groundwater, both with respect to modern wood. The validity of the model was tested by comparing the predicted values for δ C-13 (CO₂), δ C-13 (CaCO₃) with measured values for samples from the Tucson basin. δ C-13 (CO 2) calculated = (-12.9 ± 1.9) per mil PDB. δ C-13 (CO2) measured = (-15.1 ± 2.8) per mil PDB. δ C-13 (CaCO3) calculated = (-3.9 ± 1.7) per nil PDB. δ C-13 (CaCO3) measured = (-3.6 ± 1.7) per mil PDB. On the basis of these results, the model adequately describes the natural system and may prove useful in future radiocarbon dating work in desert regions.

The purpose of this study was to investigate post-traumatic stress disorder among Guatemalan and Salvadoran refugees living in Tucson, Arizona. The questions that guided the study were: (1) Does post-traumatic stress disorder exist among Central American refugees living in Tucson? (2) If so, how does it manifest itself in this population? (3) What counseling or other therapeutic interventions may be helpful for Central Americans experiencing post-traumatic stress disorder? Six Guatemalan and Salvadoran refugees who had reportedly experienced major stressors participated in a semi-structured interview and responded to a health questionnaire based upon post-traumatic stress disorder symptoms. Findings indicate that five out of six participants were experiencing patterns of stress-induced symptoms which were consistent with a DSM III diagnosis of "Post-Traumatic Stress Disorder". Recommendations for intervention with Central American individuals experiencing post-traumatic stress disorder are presented.

This thesis deals with the problem of locating emergency ambulances in an urban area. We developed a simulation model to analyze possible improvements in ambulance service. A new point-to-point travel time model is introduced in our simulation. Validating the model proved to be a difficult task and is discussed in detail. Our model has been applied to the Tucson Emergency Medical Service system.

Adlerian theory of personality development cites personality priorities as beliefs that influence behavior. Priorities such as control and perfection, for example, are goals we strive for and act on. We determine our priorities early in life as means for accomplishing a sense of belonging. Since parents create the first interpersonal climate from which children learn to relate to others and life, this research investigates the part parents' personality priorities play in creating that family climate.

No description available.

No description available.

No description available.

No description available.

No description available.