RESEARCH OF VISUAL CONTEXTUAL SUPPORT FOR THE SUBJECT OF CIRCLE ON MATHEMATICS TEACHER CANDIDATES

The purpose of this study is to research the effects of visual contextual support for the subject of circle in geometry education. The study was conducted by using one of the qualitative research methods, special case study. The sampling of the research was formed by 72 teacher candidates who are studying in Necmettin Erbakan University Ahmet Keleşoğlu Faculty of Education Primary Education Department Primary Education Mathematics Teaching Department. As data collection tool, an evaluation consisting of verbally asked problems regarding the subject of circle was used. Questions were selected according to the relevant subject among the Olympics questions. When selecting the questions, care was taken to contain most basic information about the relevant subject but include the attributes that are having difficulties in transferring of concepts into shapes. As a result of the study, it was observed that teacher candidates were having difficulties in transferring the question into a shape while solving the questions that are directed to them without a visual contextual support and reaching the correct answer. In conclusion, it is seen that questions provided with visual contextual support could easily be solved by students but prevents their spatial thinking skills.  Article visualizations

TEACHERS VIEWS RELATED TO TEACHING OF MATHEMATICS COURSE SUBJECTS WITH THEIR HISTORICAL DEVELOPMENTS

The mathematical history plays an important role in becoming interesting of mathematics courses, active participation of the students and the meaningful learning of the mathematical concepts together with the historical processes. For this reason, this study was conducted in order to take teachers’ views with respect to what kind of influences giving examples from the history of mathematics, referring to the historical developments of the subjects will leave on students and how they will affect teaching mathematics. The sample of the research is composed of 20 math teachers working in Konya province. The data were collected during the fall semester of the 2016-2017 academic year. Teachers’ views were taken by asking open-ended questions based on sub-problems involving exploiting the historical development of mathematics in teaching mathematics subjects. The analysis results were examined in detail by using descriptive statistics and content analysis in the findings part. As a result of the research, it is clearly seen that teaching mathematics subjects with their historical developments constitutes a more effective and lasting educational environment. It has been observed that a large majority of the participants support lecturing by using mathematics history but there are substantial deficiencies in practice due to the lack of material with regard to mathematics history, and paying no mind to usefulness of this.  Article visualizations

Avaliação da ameaça de erosão hídrica na ilha da Madeira - Portugal

Na estimativa da erosão hídrica na ilha da Madeira aplicou-se a Equação de Wischmeier. Recorreu-se a relações para estimar a erosividade (R); foi adequado o Índice Modificado de Fournier e relação IMF/R. cartografada a erosividade os restantes parâmetros resultaram da metodologia. IMF varia entre 81.0–465.0 mm. A equação R = 1.365 IMF1.408 estima a erosividade anual precipitação, com dados de Funchal-Observatório, sul de Portugal e valores da literatura, obtendo-se R ≈ 2 964 MJ mm h−1 ha−1 ano−1, variando entre 660- 8515. Erosão média é 28 t ha−1 ano−1, excedendo 100 em >4.9% da área. A ameaça de erosão adveio da divisão do volume de solo dos horizontes mobilizáveis, pela erosão anual. O resultado -número de anos- que ocorre a perda do solo de cobertura. Apesar do tempo para esgotamento do solo, ser >20 000 anos, a ameaça de erosão, alta e muito alta, é relevante. Estas ameaças (depleção <100 anos) ocorrem em 263 km2 (35.6%); na ameaça muito alta (depleção em <10 anos) a área é ≈40 km2 (5.4%). Encostas com declives muito elevados estão associadas a ameaças altas (ou muito altas). Efetuouse a análise da precipitação 20 de Fevereiro, obtendo-se um período de retorno superior a 100 anos.info:eu-repo/semantics/publishedVersio