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The transport of thermal energy in thermodynamics is described as the product of entropy flow and of the absolute temperature, in analogy to the volume flow and pressure in oil hydraulics and to electric charge flow (= current) and voltage in electronics. Bond graphs are shown to be especially suitable to describe the splitting of applied thermal energy into internal energy and external mechanical work. Transformers and the 0- and 1-junctions of Paynter can illustrate various entropy flow processes, including Carnot engines and heat exchangers. Entropy flow in heat conduction is distinguished from entropy convection, or transport by moving mass, where the entropy/temperature characteristic or equation of state is important. Irreversibilities are represented by impedance transformers reducing temperature and increasing entropy flow but conserving power. 相似文献
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Frederike Tirre Lorenz Kampschulte Gun-Brit Thoma Ilka Parchmann 《Research in Science & Technological Education》2013,31(4):393-418
Background: This article describes the design and the evaluation of a student lab program on the topic of nanoscience and technology (NST), mainly focusing on Nanoscience and its applications. The program was designed for students in grades 8–10 and was part of a larger outreach program of the Collaborative Research Center ‘Function by Switching’ at Kiel University. The Model of Educational Reconstruction (MER) served as a framework for the research-based design of the student lab.Purpose: We aimed to develop an authentic science activity in the area of NST in order to support scientific inquiry learning and to provide a deeper understanding of scientific topics.Sample: A total of 154 secondary school students from grades 8–10 of seven different secondary schools participated in this study.Design and methods: A pre-post questionnaire with six subscales on students’ perceptions of the Nature of Science (NOS), Scientific Inquiry (NOSI) and the involved scientists (NOST) in the area of nanoscience and nanotechnology was applied.Results: Results show that the applied explicit and reflective approach embedded in the nanoscience content significantly improved the participating students’ perceptions of NOS, NOSI and NOST facets. After the lab visit, students’ answers corresponded to a more adequate perception of today’s science and scientists. Some gender differences in learning gains were also detected.Conclusion: The study served its main purpose which was to investigate a well-balanced strategy to develop authentic out-of-school-learning environments with a focus on NOS/NOSI/NOST. Testing students’ perceptions of the nature of nanoscience provided insights into students’ worlds and served as feedback for the lab program. The outcomes of this study might help to better understand and further develop authentic (nano)science programs in out-of-school settings and science outreach programs. 相似文献
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Multimodal biomedical image indexing and retrieval using descriptive text and global feature mapping
Matthew S. Simpson Dina Demner-Fushman Sameer K. Antani George R. Thoma 《Information Retrieval》2014,17(3):229-264
The images found within biomedical articles are sources of essential information useful for a variety of tasks. Due to the rapid growth of biomedical knowledge, image retrieval systems are increasingly becoming necessary tools for quickly accessing the most relevant images from the literature for a given information need. Unfortunately, article text can be a poor substitute for image content, limiting the effectiveness of existing text-based retrieval methods. Additionally, the use of visual similarity by content-based retrieval methods as the sole indicator of image relevance is problematic since the importance of an image can depend on its context rather than its appearance. For biomedical image retrieval, multimodal approaches are often desirable. We describe in this work a practical multimodal solution for indexing and retrieving the images contained in biomedical articles. Recognizing the importance of text in determining image relevance, our method combines a predominately text-based image representation with a limited amount of visual information, in the form of quantized content-based visual features, through a process called global feature mapping. The resulting multimodal image surrogates are easily indexed and searched using existing text-based retrieval systems. Our experimental results demonstrate that our multimodal strategy significantly improves upon the retrieval accuracy of existing approaches. In addition, unlike many retrieval methods that utilize content-based visual features, the response time of our approach is negligible, making it suitable for use with large collections. 相似文献
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David Ian Walker Stephen J. Thoma Chantel Jones Kristján Kristjánsson 《British Educational Research Journal》2017,43(3):588-607
Despite a recent world‐wide upsurge of academic interest in moral and character education, little is known about pupils’ character development in schools, especially in the UK context. The authors used a version of the Intermediate Concept Measure for Adolescents, involving dilemmas, to assess an important component of character—moral judgement—among 4053 pupils aged 14–15. Data were generated in 33 UK schools of varying types between February 2013 and June 2014. Results showed that compared with US samples, the pupils’ scores were, on average, low, suggestive of tendencies towards ‘self‐interest’, ‘not getting involved’ and ‘conformity/loyalty to friends’. Judgements varied by subscales assessing ‘action’ and ‘justification’ choices; pupils more successfully identified good actions than good justifications, but generally struggled more to successfully identify poor actions and poor justifications. Highest scores were for a dilemma emphasising ‘self‐discipline’ and lowest for ‘honesty’, with ‘courage’ in between. Overall average results were significantly and positively associated with being female, having (and practising) a religion and doing specific extra‐curricular activities. Differences in schools were also noted, although the kinds of school (e.g. public/private, religious/secular) were unrelated to student scores. 相似文献
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The paper deals with the concept of ‘Critical Literacy’ in the context of VET teacher education. It focuses on the question of whether and how critical literacy can be developed drawing on elements of discourse research. This is illustrated by means of a higher educational setting, dealing with business administration textbook usage and research. The impact of our learning and teaching setting is illustrated via an empirical longitudinal study (three-phase pre-post design) of students doing a master’s degree in business education at an Austrian university. Data were initially collected directly before and after the university seminar using a semi-standardised questionnaire (n = 54). In order to obtain an insight into the sustainable impact of our discourse analysis course on students’ thought and actions, in the third phase of data collection, eight participants, who in the meantime had four months experience in VET schools as student teachers (120 h) were invited to a qualitative interview. The paper encompasses a theoretical discussion on the concept of critical literacy, applies it to the target group VET teacher students and shows empirical evidence on pros and cons of discourse analytical course design aiming at the critical literate teacher. 相似文献
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Chrystal A. George Mwangi Sadaf Latafat Shane Hammond Suzan Kommers Hanni S. Thoma Joseph Berger Gerardo Blanco-Ramirez 《Higher Education》2018,75(6):1091-1108
The current study utilizes the theory of planned behavior (Ajzen Organizational Behavior and Human Decision Processes, 50, 179–211 Ajzen 1991) to examine an instructor confirmation-interaction model in the instructional communication context to discover a means by which instructors might cultivate positive student attitudes and increase beliefs that interactions with instructors would be beneficial in the future. Specifically, the model examines how teacher confirmation (Ellis 2000) influences students’ behavioral intention to communicate with instructors. Surveys were distributed to 343 college students (41.7% male and 58.1% female) in a basic communication course. Results were primarily consistent with the proposed model; teacher confirmation was significantly related to attitudes toward communicating with an instructor, subjective norms, and perceived behavioral control. Subjective norms and perceived behavioral control were also positively related to students’ behavioral intention to communicate with the instructor. However, results reveal attitudes toward communicating do not predict students’ behavioral intention to communicate with instructors. It is recommended that future models examine a more contemporary, hi-tech representation of attitude toward student-instructor interactions as it may produce a significant association with students’ behavioral intent to communicate with them. The study concludes with theoretical and practical implications to examine student classroom communication via the confirmation-interaction model and the theory of planned behavior. 相似文献
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In this article, we discuss the benefits of Bayesian statistics and how to utilize them in studies of moral education. To demonstrate concrete examples of the applications of Bayesian statistics to studies of moral education, we reanalyzed two data sets previously collected: one small data set collected from a moral educational intervention experiment, and one big data set from a large-scale Defining Issues Test-2 survey (DIT). The results suggest that Bayesian analysis of data sets collected from moral educational studies can provide additional useful statistical information, particularly that associated with the strength of evidence supporting alternative hypotheses, which has not been provided by the classical frequentist approach focusing on P-values. Finally, we introduce several practical guidelines pertaining to how to utilize Bayesian statistics, including the utilization of newly developed free statistical software, Jeffrey’s Amazing Statistics Program (JASP), and thresholding based on Bayes Factors (BF), to scholars in the field of moral education. 相似文献
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