Natural uranium as a tracer in radionuclide geosphere transport studies

of the University of Helsinki for public criticis

Integrating Video Technology in Micro-Teaching Sessions for Teacher-Trainees’ Self-Appraisal and Professional Growth

The study examined the relationship between the use of video technology and teacher trainees’ self-appraisal for progressive professional perfectibility. Two null hypotheses were formulated to guide the study. The quasi-experiment involved 100 third year students of the Faculty of Education, Cross River University of Technology engaged in microteaching. Data was obtained through a well validated ten-item Teacher Trainee Affective Response Questionnaire (TTARQ) developed on a four point Likert-scale by the researchers. The analysis of data was done using Pearson product moment correlation coefficient and independent t-test analysis for the first and second hypotheses respectively at 0.05 level of significance and 98 degree of freedom. The result of the study shows that there is a significant relationship between the use of video technology and teacher trainees’ self-appraisal and evaluation, gender notwithstanding. The study therefore canvassed for the patronage of multi-media technology application in microteaching to enable teacher-trainees objectively assess their performance and also by their instructors and colleagues

On the accuracy of uranium-series dating:A comparison with a known matrix diffusion case

ABSTRACTThe accuracy of uranium-series dating was studied quantitatively using the natural long-lived decay chains 4n+2 and 4n+3. An unusually well-bounded matrix diffusion case was used as the reference for USD simulations. The simulations applied the traditional closed and open system models, as well as detailed multistage models that incorporated the known accumulation history of the decay chain members. The results show clearly the improved accuracy and consistency in dating with detailed mass flow information.</jats:p