Thesis (M.S.)--Boston University / In the following thesis I have attempted to illustrate words of a hundred years ago with appropriate photographs of present-day remains of an era. The years covered in the major sections are 1831 to 1848; the subject is slavery and abolition in New England. The Liberator was the most renowned antislavery paper. Selections from it form the text of the major part of this thesis. Complete bound editions of The Liberator may be found in the Boston Public Library, Main Branch, Copley Square. With the permission of the Supervisor I was able to photograph portions of the paper.

Text in Afrikaans / Die studie het ten doel om 'n moontlike verband tussen lokus van kontrole jeens skoolwerk en depressie by die adolessent te identifiseer. Die literatuurstudie ondersoek lokus van kontrole - as aspek van verantwoordelikheid - en depressie, sowel as die ontwikkeling van die adolessent. Uit die literatuurstudie ontstaan die gevoel dat sodanige verband wel bestaan. 'n Gerieflikheidsteekproef - bestaande uit graad 11 leerders - is vir die navorsing gebruik. Die deelnemers vul 'n biografiese vraelys in, sowel as Afrikaanse weergawes van Crandall se Intellectual Achievement Responsibility Questionnaire en die Beck Depression Inventory. Die resultate van die biografiese vraelys, lokus van kontrole vraelys en depressie opname word individueel uiteengesit voordat daar 'n ondersoek gedoen word na moontlike samevallende verskille of korrelasies tussen lokus van kontrole tellings en depressie tellings. weergegee. Gelyktydige voorkoms word ook as persentasies Geen statisties beduidende korrelasies tussen depressie en lokus van kontrole jeens skoolwerk is gevind nie, wat moontlik toegeskryf kan word aan die aard van die steekproef. Verdere navorsing word aanbeveel. / The aim of the study was the identification of a possible relation between locus of control towards schoolwork and depression in adolescence. Locus of control - as an aspect of responsibility - and depression, as well as the development of the adolescent are examined in a literature study. As a result of this the feeling that a relationship between the named variables do exist is expressed. A convencience sample- consisting of grade 11 learners - is used in the research. The participants complete a biographic questionnaire, as well as Afrikaans translations of Crandall's Intellectual Achievement Responsibility Questionnaire and the Beck Depression Inventory. The result of the biographic questionnaire, the responsibility questionnaire and the depression inventory are reported on their own before an investigation is done regarding possible simultaneous differences or correlations between locus of control values and depression values. Percentages are used for the report of simultaneous values. No statistical meaningful differences or correlations were found, which might be ascribed to the nature of the sample. Further research is recommended. / Psychology of Education / M. Ed. (Voorligting)

Text in Afrikaans / Die studie het ten doel om 'n moontlike verband tussen lokus van kontrole jeens skoolwerk en depressie by die adolessent te identifiseer. Die literatuurstudie ondersoek lokus van kontrole - as aspek van verantwoordelikheid - en depressie, sowel as die ontwikkeling van die adolessent. Uit die literatuurstudie ontstaan die gevoel dat sodanige verband wel bestaan. 'n Gerieflikheidsteekproef - bestaande uit graad 11 leerders - is vir die navorsing gebruik. Die deelnemers vul 'n biografiese vraelys in, sowel as Afrikaanse weergawes van Crandall se Intellectual Achievement Responsibility Questionnaire en die Beck Depression Inventory. Die resultate van die biografiese vraelys, lokus van kontrole vraelys en depressie opname word individueel uiteengesit voordat daar 'n ondersoek gedoen word na moontlike samevallende verskille of korrelasies tussen lokus van kontrole tellings en depressie tellings. weergegee. Gelyktydige voorkoms word ook as persentasies Geen statisties beduidende korrelasies tussen depressie en lokus van kontrole jeens skoolwerk is gevind nie, wat moontlik toegeskryf kan word aan die aard van die steekproef. Verdere navorsing word aanbeveel. / The aim of the study was the identification of a possible relation between locus of control towards schoolwork and depression in adolescence. Locus of control - as an aspect of responsibility - and depression, as well as the development of the adolescent are examined in a literature study. As a result of this the feeling that a relationship between the named variables do exist is expressed. A convencience sample- consisting of grade 11 learners - is used in the research. The participants complete a biographic questionnaire, as well as Afrikaans translations of Crandall's Intellectual Achievement Responsibility Questionnaire and the Beck Depression Inventory. The result of the biographic questionnaire, the responsibility questionnaire and the depression inventory are reported on their own before an investigation is done regarding possible simultaneous differences or correlations between locus of control values and depression values. Percentages are used for the report of simultaneous values. No statistical meaningful differences or correlations were found, which might be ascribed to the nature of the sample. Further research is recommended. / Psychology of Education / M. Ed. (Voorligting)

Ground subsidence due to underground coal mining is a complex, narrowly-understood phenomenon. Due to the complicated physical processes involved and the lack of a complete knowledge of the characteristics of overlying strata, the reliability of current prediction techniques varies widely. Furthermore, the accuracy of any given prediction technique is largely dependent upon the accuracy of field measurements and surveys which provide input data for the technique. A valuable resource available for predicting and modeling subsidence is aerial survey technology. This technology produces yearly datasets with a high density of survey points. The following study introduces a method wherein these survey points are converted into elevation plots and subsidence plots using GIS. This study also presents a method, titled the Type-Xi Integration method (TXI method), which improves upon a previous subsidence prediction technique. This method differs from the previous technique in that it incorporates accurate surface topography and considers irregular mine geometry, as well as seam thickness and overburden variations in its predictions. The TXI method also involves comparing predicted subsidence directly to measured subsidence from subsidence plots. In summary, this study illustrates a method of combining data from aerial survey points and mine geometry with subsidence models in order to improve the accuracy of the models.