Implementing statistical learning methods through Bayesian networks. Part 1: a guide to Bayesian parameter estimation using forensic science data

As a thorough aggregation of probability and graph theory, Bayesian networks currently enjoy widespread interest as a means for studying factors that affect the coherent evaluation of scientific evidence in forensic science. Paper I of this series of papers intends to contribute to the discussion of Bayesian networks as a framework that is helpful for both illustrating and implementing statistical procedures that are commonly employed for the study of uncertainties (e.g. the estimation of unknown quantities). While the respective statistical procedures are widely described in literature, the primary aim of this paper is to offer an essentially non-technical introduction on how interested readers may use these analytical approaches - with the help of Bayesian networks - for processing their own forensic science data. Attention is mainly drawn to the structure and underlying rationale of a series of basic and context-independent network fragments that users may incorporate as building blocs while constructing larger inference models. As an example of how this may be done, the proposed concepts will be used in a second paper (Part II) for specifying graphical probability networks whose purpose is to assist forensic scientists in the evaluation of scientific evidence encountered in the context of forensic document examination (i.e. results of the analysis of black toners present on printed or copied documents).

Integrating environmental education in primary school education in Tanzania : teachers’ perceptions and teaching practices

The study focuses on primary school teachers’ perceptions of environmental education, its integration into primary school education and teachers’ teaching practices in Tanzania. The thesis is based on empirical research. The theoretical underpinnings of the study are based on Palmer’s (1998) model of environmental education. According to the model, meaningful environmental education should include education about, in or through and for the environment. The study is supported by national and international literature from research done on environmental education and education for sustainable development and policy statements. The study is qualitative in nature, adopting phenomenography and phenomenology as points of departure. The empirical data was collected from four primary schools in Morogoro region in Tanzania. The study sample consisted of 31 primary school teachers. Data was collected through interviews and lesson observations. According to the results of the study, primary school teachers expressed variations in their perceptions of environmental education and education for sustainable development. Most of the teachers focused on the aspect of knowledge acquisition. According to Tanzanian education and training policy, environmental education has to be integrated into all subjects. Although there is environmental education in the primary school curriculum, it is not integrated on an equal footing in all subjects. Some subjects like science, social studies and geography have more environmental content than other subjects. Teachers claim that the approach used to integrate environmental education into the school curriculum was not favoured because many claimed that what is to be taught as environmental education in the various subjects is not shown clearly. As a result, many teachers suggested that to ensure that it is taught properly it should be included in the curriculum as an independent subject or as specific topics. The study revealed that teachers’ teaching practices in integrating environmental education varied from one subject to another. Although most of the teachers said that they used participatory methods, lesson observations showed that they limited themselves to question and answer and group discussion. However, the teachers faced a number of barriers in the teaching of environmental education, some of which include lack of teaching and learning resources, time and large class size. The role of teachers in the implementation of environmental education in developing an environmentally literate citizenry is of great significance. The responsibility of the government in developing a curriculum with clear goals and content, developing teachers’ capacity in the teaching of environmental education and provision of teaching and learning materials needs to be taken seriously by the government in educational plans and programs.

First dice your dill – new methods and techniques in sample handling

This book is dedicated to celebrate the 60th birthday of Professor Rainer Huopalahti. Professor Rainer “Repe” Huopalahti has had, and in fact is still enjoying a distinguished career in the analysis of food and food related flavor compounds. One will find it hard to make any progress in this particular field without a valid and innovative sample handling technique and this is a field in which Professor Huopalahti has made great contributions. The title and the front cover of this book honors Professor Huopahti’s early steps in science. His PhD thesis which was published on 1985 is entitled “Composition and content of aroma compounds in the dill herb, Anethum graveolens L., affected by different factors”. At that time, the thesis introduced new technology being applied to sample handling and analysis of flavoring compounds of dill. Sample handling is an essential task that in just about every analysis. If one is working with minor compounds in a sample or trying to detect trace levels of the analytes, one of the aims of sample handling may be to increase the sensitivity of the analytical method. On the other hand, if one is working with a challenging matrix such as the kind found in biological samples, one of the aims is to increase the selectivity. However, quite often the aim is to increase both the selectivity and the sensitivity. This book provides good and representative examples about the necessity of valid sample handling and the role of the sample handling in the analytical method. The contributors of the book are leading Finnish scientists on the field of organic instrumental analytical chemistry. Some of them are also Repe’ s personal friends and former students from the University of Turku, Department of Biochemistry and Food Chemistry. Importantly, the authors all know Repe in one way or another and are well aware of his achievements on the field of analytical chemistry. The editorial team had a great time during the planning phase and during the “hard work editorial phase” of the book. For example, we came up with many ideas on how to publish the book. After many long discussions, we decided to have a limited edition as an “old school hard cover book” – and to acknowledge more modern ways of disseminating knowledge by publishing an internet version of the book on the webpages of the University of Turku. Downloading the book from the webpage for personal use is free of charge. We believe and hope that the book will be read with great interest by scientists working in the fascinating field of organic instrumental analytical chemistry. We decided to publish our book in English for two main reasons. First, we believe that in the near future, more and more teaching in Finnish Universities will be delivered in English. To facilitate this process and encourage students to develop good language skills, it was decided to be published the book in English. Secondly, we believe that the book will also interest scientists outside Finland – particularly in the other member states of the European Union. The editorial team thanks all the authors for their willingness to contribute to this book – and to adhere to the very strict schedule. We also want to thank the various individuals and enterprises who financially supported the book project. Without that support, it would not have been possible to publish the hardcover book.

Peer-Led Team Learning as an Instructional Strategy for Secondary School Science

This study investigated the impact of an instructional learning strategy, peer-led team learning (PLTL), on secondary school students' conceptual understanding of biology concepts related to the topic of evolution. Using a mixed methods approach, data were gathered quantitatively through pre/posttesting using a repeated measures design and qualitatively through observations, questionnaires, and interviews. A repeated measures design was implemented to explore the impact of PLTL on students' understanding of concepts related to evolution and students' attitudes towards PLTL implementation. Results from quantitative data comparing pre/posttesting were not able to be compared through inferential statistics as a result of inconsistencies in the data due to a small sample size and design limitations; however, qualitative data identified positive attitudes towards the implementation of PLTL, with students reporting gains in conceptual understanding, academic achievement, and interdependent work ethic. Implications of these findings for learning, teaching, and the educational literature include understanding of student attitudes towards PLTL and insight into the role PLTL plays in improving conceptual understanding of biology concepts. Strategies are suggested to continue further research in the area of PLTL.

Exploring the Current State of Grades 4 to 8 Science Education in Ontario

This study sought to explore the current state of Grades 4 to 8 science education in Ontario from the perspective of Junior/Intermediate (J/I) teachers. The study’s methodology was a sequential 2-phased mixed methods explanatory design denoted as QUAN (qual)  qual. Data were collected from an online survey and follow-up interviews. J/I teachers (N = 219) from 48 school boards in Ontario completed a survey that collected both quantitative and qualitative data. Interviewees were selected from the survey participant population (n = 6) to represent a range of teaching strategies, attitudes toward teaching science, and years of experience. Survey and interview questions inquired about teacher attitudes toward teaching science, academic and professional experiences, teaching strategies, support resources, and instructional time allotments. Quantitative data analyses involved the descriptive statistics and chi-square tests. Qualitative data was coded inductively and deductively. Academic background in science was found to significantly influence teachers’ reported level of capability to teach science. The undergraduate degrees held by J/I science teachers were found to significantly influence their reported levels of capability to teach science. Participants identified a lack of time allocated for science instruction and inadequate equipment and facilities as major limitations on science instruction. Science in schools was reported to be of a “second-tiered” value to language and mathematics. Implications of this study include improving undergraduate and preservice experiences of elementary teachers by supporting their science content knowledge and pedagogical content knowledge.

Teaching secondary science using ICT.

El nivel alcanzado por las Tecnologías de la Información y de la Comunicación en el mundo actual, en el que van a vivir y trabajar nuestros estudiantes, justifica su utilización en las aulas. Las TIC han transformado la enseñanza de las ciencias en las escuelas, pues aportan nuevas posibilidades a los profesores y ofrecen una mayor independencia en su trabajo y en su forma de pensar a los estudiantes.

Success for schools science 3. Teaching resources photocopiable.

Se apoya en el libro del alumno y cumple los objetivos docentes para la etapa 3 (key stage 3) del nivel de secundaria del plan de estudios inglés. Ofrece a los profesores distintas técnicas para el aprendizaje de las ciencias, unas dirigidas a cada estudiante a nivel individual, otras, para realizar, por parejas, por grupos o toda la clase en conjunto. También, contiene varios sugerencias para actividades prácticas, hojas de trabajo fotocopiables, así como un apartado con las normas de seguridad a seguir en las escuelas en cuanto a materiales, productos químicos y equipos utilizados por los alumnos durante el curso.

100 ideas for teaching science. '100 ideas para enseñar ciencias'.

Ofrece a los profesores de ciencias un gran número de ideas prácticas para la enseñanza y el aprendizaje de su disciplina en el aula. Se presentan estrategias que desarrollan un ambiente de aprendizaje seguro y estimulante para los alumnos; actividades de interés científico, relacionadas con la biología, la física y la química, actividades para mejorar el aprendizaje de los alumnos y para ayudar en la utilización de las tecnologías de la Información y la Comunicación (TIC). También, se aportan ideas para debates eficaces que, no solo, mejoran los conocimientos y la comprensión de la ciencia, sino que aumentan la confianza de los alumnos; y experimentos sencillos y de otro tipo, que han dejado impresionados a los estudiantes.

Teaching and learning geometry : issues and methods in mathematical education.

Recurso para la evaluación de la enseñanza y el aprendizaje de la geometría en la enseñanza secundaria desde la perspectiva de los nuevos docentes y de los que tienen más experiencia. Está diseñado para ampliar y profundizar el conocimiento de la materia y ofrecer consejos prácticos e ideas para el aula en el contexto de la práctica y la investigación actual. Hace especial hincapié en: comprender las ideas fundamentales del currículo de geometría; el aprendizaje de la geometría de manera efectiva; la investigación y la práctica actual; las ideas erróneas y los errores; el razonamiento de la geometría; la solución de problemas; el papel de la tecnología en el aprendizaje de la geometría.

Reflective teaching of Science 11-18.

Abarca todos los aspectos de la práctica docente, desde la planificación hasta la enseñanza y la evaluación. También, proporciona detallada información sobre las actividades que se realizan en la etapa 3 (key stage 3) de la estrategia nacional en ciencias (National Sciences Strategy), que se corresponde con el nivel de secundaria.

Teaching secondary science.

Enfoca la enseñanza de las ciencias en la escuela secundaria desde el punto de vista contructivista del aprendizaje en los niños. Reúne los requisitos exigidos en el curriculo nacional de Inglaterra del año 2000 y en la Estrategia nacional para las ciencias (National Strategy for Science). Está dividido en cinco partes, que están vinculadas a las tres normas para la obtención de la cualificación docente: primera, los valores profesionales y la práctica, es decir, qué es la ciencia y justificar su lugar en el curriculo; segunda, el conocimiento y la comprensión de las ideas que traen los alumnos y la mejor manera de iniciarles en nuevas ideas científicas. Y en tercer lugar, la enseñanza, que comprende la planificación, la evaluación, la enseñanza y la dirección de la clase por parte del profesor.

Teaching science with ICT.

Trata sobre la enseñanza de la ciencia en la etapa de secundaria por medio del uso de las tecnologías de la Información y la Comunicación (TIC). El libro está dividido en dos partes: en la primera, se proporciona información de fondo para ayudar a comprender el impacto y el potencial de estas nuevas tecnologías que mejoran el aprendizaje curricular de los alumnos, también, por las oportunidades que ofrecen para la investigación y la práctica. En la segunda parte, se examina la profunda influencia que la aplicación del software ha dejado en las clases de ciencias, así como, sus beneficios, y sugiere enfoques que aseguren estos beneficios.

Teaching secondary how science works.

El propósito de este libro es ayudar a los profesores a cumplir con los enunciados incluidos en la última versión del curriculo nacional en ciencias. Para ello, pone de relieve varios elementos que forman parte de cómo trabajar con la ciencia y que los maestros deben entender y enseñar: datos, pruebas, teorías y explicaciones, habilidades para la comunicación y aplicaciones e implicaciones de la ciencia. Cumple con los requisitos para la enseñanza de la ciencia en secundaria. Se acompaña de un CD-ROM con hojas de trabajo para los alumnos.