No description available.

No description available.

No description available.

No description available.

No description available.

No description available.

This research investigated the relationships between molecular size and the TOC, TTHM, acid strength and color concentrations present in raw and coagulated water from Lake Washington. Three separate coagulants were utilized for investigation. There were: Al, Fe and Mg. Results indicated that the majority of the TOC, color and TTHM precursors were in the colloidal size range and removed by coagulation. The remaining TTHM precursors are mostly molecular and require a process other than coagulation for removal from the potable water before environmental standards are met.

No description available.

The purpose of the study was to compare a freshman cohort of first and non first-generation college students enrolled in an urban university and to identify characteristics that distinguish the two groups in terms of selected demographics, pre-college behaviors and beliefs (expectations and personal traits). Moreover, the study sought to identify variables whose distribution indicated a significant difference between the two groups and rank those variables by order of the strength of association. Data analysis for this study consisted of a combination of chi-square and descriptive discriminate analysis using logistic regression. Chi-square analysis was the preliminary statistical procedure used in this study. I relied on a sequence of chi-square analyses to help identify a list of statistically significant variables to be used in the subsequent descriptive discriminate logistic regression model. Descriptive discriminate analysis was used because its primary function is designed to reveal projected differences among groups (Huberty, 1994). The results revealed seven important characteristics (Reading for pleasure (Hpw0111), Household income (Income), Asked teacher for advise (Act0114), Rate computer skills (Rate0103), Get a bachelor's degree (Futact11), Change major field of study (Futact01) and Obtain recognition by colleague (Goal0103) were commonly statistically significant student characteristics across all race/ethnicity groups, and three (Gain a general education (Reason05), High school grade point average (HSGPA) and Felt overwhelmed (Act0110) were unique to one or some of the groups. These variables can also be viewed as predictors that help identify the likelihood that a student is first-generation. Results of this study had implications for the practice of high school guidance counselors, student and academic affairs practitioners and specifically support services personnel and financial aid officers. / Ph. D.

The purpose of this study was to examine whether cueing strategies embedded in computer delivered text messages affected the recall and comprehension of students who differed in their field dependent-independent cognitive style orientations. Two hundred thirty-eight undergraduate students of Virginia Tech participated the study, and 219 sets of valid data were used for the statistical analyses. All participants were given the Group Embedded Figures Test to determine their level of field dependence-independence. They were then randomly assigned to one of three treatment groups that varied in their use of cueing strategy. The first treatment group featured computer delivered text messages with color-highlighted-keywords, the second group featured the same textual content with color-highlighted-key-phrases, and the third group was a control group that featured the same content and employed no cueing strategy. Participants were administered two tests following the treatments, one that assessed knowledge of terminology and another that assessed comprehension. A 3 x 3 Analysis of Variance was conducted to explore the main effects for field dependency and cueing strategy and any interaction effect between the two factors. The results showed that field independents outperformed field dependents in all tests. There were no significant differences for the three treatments; the cueing strategies employed in this study had no effect on participants' learning. A significant interaction was seen between field dependency and cueing strategy. However, the results of a one-way ANOVA are unexpected: the cueing strategies employed did not improve field dependents' performance on the assessments and actually hindered the performance of field independents. / Ph. D.