Photocatalytic Degradation of Persistent and Toxic Organic Pollutants and its Mechanism

Persistent and toxic organic pollutants are serious environmental concerns in many parts of the world. These pollutants are often difficult to deal with using conventional treatment processes. Photocatalysis is an emerging technology which uses environmentally-friendly oxidants (oxygen, hydrogen peroxide, ozone),photocatalysts (titanium dioxide, ferrous ions or its complexes) and ultraviolet (UV) radiation to degrade and mineralize the toxic organic pollutants. The major drawback is that photocatalytic processes need to be activated by ultraviolet light, which accounts for only about 4% of the incoming solar energy; the overall reaction efficiency is still very low.     

Multi-candidate reduction: Sentence compression as a tool for document summarization tasks

This article examines the application of two single-document sentence compression techniques to the problem of multi-document summarization—a “parse-and-trim” approach and a statistical noisy-channel approach. We introduce the multi-candidate reduction (MCR) framework for multi-document summarization, in which many compressed candidates are generated for each source sentence. These candidates are then selected for inclusion in the final summary based on a combination of static and dynamic features. Evaluations demonstrate that sentence compression is a valuable component of a larger multi-document summarization framework.     

Improving Person-Fit Assessment by Correcting the Ability Estimate and Its Reference Distribution

The standardized log-likelihood of a response vector (l_z) is a popular IRT-based person-fit test statistic for identifying model-misfitting response patterns. Traditional use of l_z is overly conservative in detecting aberrance due to its incorrect assumption regarding its theoretical null distribution. This study proposes a method for improving the accuracy of person-fit analysis using l_z which takes into account test unreliability when estimating the ability and constructs the distribution for each l_z through resampling methods. The Type I error and power (or detection rate) of the proposed method were examined at different test lengths, ability levels, and nominal α levels along with other methods, and power to detect three types of aberrance—cheating, lack of motivation, and speeding—was considered. Results indicate that the proposed method is a viable and promising approach. It has Type I error rates close to the nominal value for most ability levels and reasonably good power.     

Mapping the Steps toward Basic Understanding of Scientific Inquiry

Benchmarks for Science Literacy (AAAS 1993) lists for four gradelevels the steps by which students might achieve science literacy before leaving high school. These steps and the conceptual connections among them are now being mapped to suggest where anyone idea or skill comes from, what it is connected to, and where it leads. A set of 49 such strand maps appears in Atlas of Science Literacy (AAAS 2001). This paperdescribes strand maps in general and examinesthree draft maps titled Evidence and Reasoning, Scientific Investigations, and Scientific Theories, which together represent one section of Benchmarks Chapter 1, on scientific inquiry. The maps do not prescribe any particular curriculum, but can aid in planning a variety of curricula, analyzing instructional materials, assessing student understanding, and can be used in professional development for teachers.     

Early childhood education for all: a mixed-methods study of the global policy agenda in Tanzania

This study considers the extent to which access to basic education and student learning outcomes have become more equalized or more disparate in Tanzania following the implementation of the international Education for All (EFA) initiative, and whether early childhood education access and performance follow similar patterns. To answer these questions, we apply a mixed-methods research design, which includes a longitudinal analysis of changes in educational opportunity and a critical discourse analysis (CDA) of key education policy documents in Tanzania. Findings from our quantitative analysis suggest that social inequality is persistent across time and consistent across access and learning outcomes at the early childhood and basic education levels. The implication is that, to date, the EFA agenda has only served to reproduce social inequalities in Tanzania, with the exception of increased opportunity for girls. These results align with CDA findings assessing the global and national policy discourse, which find educational inequalities to be prioritized in language but not adequately in final targets and strategies. Given the resiliency of such education inequalities, it would appear that policy capable of removing social barriers to educational opportunity requires more attention to specific at-risk student populations.     

Effects of group experience and information distribution on collaborative learning

Instructional Science - Collaborative learning is a widely used instructional technique, but factors determining its effectiveness still are unclear. Cognitive load theory was used to examine the...     

The Value of Fieldwork in Life and Environmental Sciences in the Context of Higher Education: A Case Study in Learning About Biodiversity

Fieldwork is assumed by most practitioners to be an important if not essential component of a degree level education in the environmental sciences. However, there is strong evidence that as a result of a wide range of pressures (academic, financial and societal) fieldwork is in decline in the UK and elsewhere. In this paper we discuss the value of fieldwork in a higher education context and present the results of a case study which illustrates its value to student learning and the wider student experience. We used qualitative and quantitative methods to compare the impact of two learning tasks upon the affective and cognitive domains of students. We designed two tasks. One task that included fieldwork, and required students to collect organisms from the field and make labelled drawings of them, and one task that omitted the fieldwork and simply required drawing of specimens that the students had not collected. We evaluated the students’ experience through structured and semi-structured questionnaires and written exercises. Students did not perceive the two tasks as being equivalent to one another. They reported that they enjoy fieldwork and value it (in the contexts of their learning at university, life-long learning, and in relation to their career aspirations) and felt that they learn more effectively in the field. Our students were better able to construct a taxonomic list of organisms that they had collected themselves, better able to recall the structural detail of these organisms and were better able to recall the detail of an ecological sampling methodology that they had personally carried out in the field rather than one that a tutor had described to them in a classroom setting. Our case study supports the growing body of evidence that fieldwork is an important way of enhancing undergraduate learning and highlights some key areas for future research.     

Can Wii Engage College-Level Learners? Use of Commercial Off-the-Shelf Gaming in an Introductory Statistics Course

Technological advancements and growing dependence on media outlets as sources of information compete for the attention of individuals born in a rapidly expanding digital age. As a result, educators using traditional, nondigital teaching methods struggle with keeping students engaged in the classroom. The present study assessed the extent to which a digitally enhanced learning environment can improve student involvement in learning. A traditional behavioral statistics lecture was supplemented with Nintendo Wii video gaming to increase student content knowledge comprehension and engagement with course material. A mixed Analysis of Variance (ANOVA) revealed that those in the video gaming condition improved significantly more than those receiving traditional lecture only. This research suggests that students can learn difficult conceptual material (i.e., statistics) through more novel, interactive teaching methods.     

Re–valuing the role of images in reviewing picture books

This paper discusses the narrative role of images in three prize–winning children’s books: ‘The Rabbits’ by John Marsden and Shaun Tan; ‘Joseph had a Little Overcoat’ by Simms Taback; and ‘The House that Jack Built’ by Gavin Bishop. It is argued that the contribution of images to interpretive possibilities of the narrative are typically not sufficiently addressed in reviewing picture books. In dealing with this aspect of images in picture books, an approach to ‘reading images’ as described in the book of that title by Gunther Kress and Thao van Leeuwen is suggested as a productive resource for reviewers and teachers.     

Developing a postgraduate work-based curriculum using an Intervention Mapping Approach

Advanced practitioner skill development has become an important focus in health service delivery as increasingly complex consumer needs, practice environments and national professional registration requirements impact on professional work practices. Increasingly, work-based or workplace learning experiences are being seen as an effective means for maintaining skill currency across working lives. Currently there is limited literature on pedagogical practices to support the educational and training requirements associated with development across a person's working life. This paper reports on an example of how an intervention mapping framework was used to guide the development, implementation and evaluation of a work-based praxis course for students in an interprofessional, online postgraduate mental health programme. The intervention mapping framework provided a stepped process to guide decision-making and allowed the incorporation of theory and evidence into the course design. This approach provided a stepped process to guide decision-making and allowed the incorporation of theory and evidence into the course design. While the use of the intervention mapping framework is often used within health promotion arenas, particularly for the effective design of health promotion educational programmes, it is argued that this framework can be utilised effectively when developing curriculum for use within higher education programmes.