Algorithm-improved high-speed and non-invasive confocal Raman imaging of 2D materials

Confocal Raman microscopy is important for characterizing 2D materials, but its low throughput significantly hinders its applications. For metastable materials such as graphene oxide (GO), the low throughput is aggravated by the requirement of extremely low laser dose to avoid sample damage. Here we introduce algorithm-improved confocal Raman microscopy (ai-CRM), which increases the Raman scanning rate by one to two orders of magnitude with respect to state-of-the-art works for a variety of 2D materials. Meanwhile, GO can be imaged at a laser dose that is two to three orders of magnitude lower than previously reported, such that laser-induced variations of the material properties can be avoided. ai-CRM also enables fast and spatially resolved quantitative analysis, and is readily extended to 3D mapping of composite materials. Since ai-CRM is based on general mathematical principles, it is cost-effective, facile to implement and universally applicable to other hyperspectral imaging methods.     

USING A STATE TEACHER CERTIFICATION TEST TO ASSESS AN INQUIRY-BASED SCIENCE EDUCATION PROGRAM

In this study, we looked at the impact of our specially designed inquiry-based science courses for pre-service elementary teachers on their science content knowledge as measured by a high-stakes state certification test for elementary education. We conducted a pre/post-analysis of the certification test scores of 1,003 pre-service teachers. Cohort 1 consisted of 424 students who took the test prior to implementation of our reformed science courses. Cohort 2 consisted of 579 students taking the test after complete implementation. We examined overall test scores, science subscores, total science credits, age, and science transfer credits. We found that the overall test score dropped significantly from cohort 1 to cohort 2, but the science subscores remained unchanged. Our results showed that students who took all 3 of the science content courses vs. none scored significantly higher on the science portion, non-traditional students (older than 25) scored similarly to traditional-aged students, and there was a negative correlation with the number of science courses transferred. Of importance is the fact that students who took the minimal number of science courses and are less interested in science passed the science portion at the same rate (over 90%) as science majors and minors. We conclude that our pre-service elementary teachers can and do learn science content using inquiry as recommended by the National Science Education Standards (NRC, 1996).     

A systematic review and Bayesian meta-analysis of the development of turn taking in adult–child vocal interactions

Fluent conversation requires temporal organization between conversational exchanges. By performing a systematic review and Bayesian multi-level meta-analysis, we map the trajectory of infants’ turn-taking abilities over the course of early development (0 to 70 months). We synthesize the evidence from 26 studies (78 estimates from 429 unique infants, of which at least 152 are female) reporting response latencies in infant–adult dyadic interactions. The data were collected between 1975 and 2019, exclusively in North America and Europe. Infants took on average circa 1 s to respond, and the evidence of changes in response over time was inconclusive. Infants’ response latencies are related to those of their adult conversational partners: an increase of 1 s in adult response latency (e.g., 400 to 1400 ms) would be related to an increase of over 1 s in infant response latency (from 600 to 1857 ms). These results highlight the dynamic reciprocity involved in the temporal organization of turn-taking. Based on these results, we provide recommendations for future avenues of enquiry: studies should analyze how turn-by-turn exchanges develop on a longitudinal timescale, with rich assessment of infants’ linguistic and social development.     

Global Learning and Education for Sustainable Development

Globalization is a fundamental factor affecting higher education in this century. More than ever before, the processes of globalization are being integrated into a set of social, technological, economic, cultural and ecological factors, so that we are now beginning to accept that we are facing a completely irreversible world‐wide phenomenon. The concept of sustainable development integrates these factors and leads, beside environmental education, to a demand for global learning and education for sustainable development. To get a better understanding of the subject, the decision‐game ‘Prisoner's Dilemma’ focuses on the aspect of the public good.     

Training for reflective expertise: A four-component instructional design model for complex cognitive skills

This article presents a four-component instructional design model for the training of complex cognitive skills. In the analysis phase, the skill is decomposed into a set of recurrent skills that remain consistent over problem situations and a set of nonrecurrent skills that require variable performance over situations. In the design phase, two components relate to the design of practice; they pertain to the conditions under which practice leads either to rule automation during the performance of recurrent skills or to schema acquisition during the performance of nonrecurrent skills. The other two components relate to the design of information presentation; they pertain to the presentation of information that supports the performance of either recurrent or nonrecurrent skills. The basic prediction of the model is that its application leads to “reflective expertise” and increased performance on transfer tasks. Applications of the model that support this prediction are briefly discussed for the training of fault management in process industry, computer programming, and statistical analysis.     

Information management and learning in computer conferences: Coping with irrelevant and unconnected messages

The present study examines how learnersinteract with one another within the context ofa computer conference for the purposes ofpassing a test. In a faked computer conferencewith predetermined messages, both the number ofmessages irrelevant to the topic, and theexplicit threading of messages were varied in a2 × 2 design (n = 54). Subjects participated in anasynchronous fashion over a course of fourlog-in sessions. In general, learners indicateda fairly consistent pattern of reception. Theyopened virtually all messages, grouped them ina non-chronological order, and processed themaccording to their topic relevance. Thispattern was also mediated by the conferencecharacteristics. Explicit threading led tosequences of message readings that were morecontent oriented. Similarly, fewer irrelevantmessages lead to prolonged reading times ofrelevant messages. Whereas learning success wasnot affected by conference characteristics,explicitly threaded messages decreased theperceived cognitive demands.     

The engineering of engineering education: curriculum development from a designer's point of view

Engineers have a set of powerful tools at their disposal for designing robust and reliable technical systems. In educational design these tools are seldom applied. This paper explores the application of concepts from the systems approach in an educational context. The paradigms of design methodology and systems engineering appear to be suitable for both analysing existing education and designing new curricula.     

What affects learner engagement in flipped learning and what predicts its outcomes?

The current popularity of flipped learning may be attributed to its reported successes in bringing about enhanced learner engagement and positive learning outcomes. This study aims to improve our understanding of flipped learning (FL) outcomes by examining factors of learner engagement, academic capability, and epistemological beliefs. Data were collected and statistically analyzed from 231 undergraduate students enrolled in a general biology or general chemistry course at a Korean university implemented with the FL model. The results indicated that learners’ epistemological beliefs influenced neither pre-class nor in-class engagement, but that academic capability did affect both pre-class and in-class engagement. Only content/learning-related outcomes, not generic competencies or satisfaction, were affected by both academic capability and epistemological beliefs. Both pre-class and in-class engagement levels affected most types of FL outcomes except generic competencies, which were only affected by the extent of in-class engagement. Learners’ affective engagement was not influenced by epistemological beliefs, but directly and indirectly affected FL outcomes via behavioral and cognitive engagement. Theoretical and practical implications are discussed along with recommendations.     

Comparing Simple and Advanced Video Tools as Supports for Complex Collaborative Design Processes

Working with digital video technologies, particularly advanced video tools with editing capabilities, offers new prospects for meaningful learning through design. However, it is also possible that the additional complexity of such tools does not advance learning. We compared in an experiment the design processes and learning outcomes of 24 collaborating participant pairs (dyads) using 2 contrasting types of video tools for history learning. The advanced video tool WebDIVER supported segmenting, editing, and annotating capabilities. In the contrasting condition, students used a simple video playback tool with a word processor to perform the same design task. Results indicated that the advanced video editing tool was more effective in relation to (a) fostering student understanding of the topic and acquisition of cognitive skills, (b) the quality of student design products, and (c) the efficiency of dyad interactions. The implication of our experimental findings for constructivist design-based learning is that mediating functions of video tools may be used as cognitive and social supports, for example when students learn by solving design tasks in school.