1,720,956 research outputs found
Preparation of Ferroelectric KNbO3 Based Borate Glass System
No full textThe incorporation method was employed to produce ferroelectric glass ceramics from the K2O–Nb2O5–B2O3 glass system. The nanocrystalline potassium niobate (KNbO3) was first prepared using a simple mixed oxide method, where the B2O3 was initially mixed and then melted to form glass. The successfully produced optically transparent glass was then subjected to a heat treatment schedule for further crystallization at temperatures ranging from 500 to 650 C, which resulted in the precipitation of the KNbO3 phase, together with the K3B2Nb3O12 phase. Scanning electron microscopy (SEM) showed the presence of randomly oriented KNbO3 crystals dispersed in a
continuous glass matrix. It was found that the glass ceramics subjected to the heat treatment at temperatures higher than 545 C were opaque, while the lower gave a highly transparent glass ceramics. The crystal size and crystallinity were found to increase with increasing heat treatment temperature, which in turn plays an important role in controlling the properties of the glass ceramics,including physical, optical, and dielectric properties.มหาวิทยาลัยราชภัฎเชียงใหม
Pre-Service Teachers’ Responses to Ethical Situations Related to Teaching Practice
No full textAbstractEnhancing ethics concerning teaching practice is one of the most important issues in teacher education. All teachers need to improve their ethical sense for maintaining professional standards in teaching and doing research as well as monitoring and guiding students’ ethical behaviours. It is crucial for pre-service teachers to develop their ethical sense during learning in teacher institutions. The purpose of this study is to investigate pre-service teachers’ responses to ethical situations. The responses were collected from seventy-four third-year pre-service physical and health education teachers who enrolled in the Ethics and Codes for Teachers Course in 2014. Six ethical situations with open-ended questions relating to student plagiarisms, teacher-teacher conflicts, and parent-teacher conflicts were used to gather the pre-service teachers’ views. The pre-service teachers were grouped into five to seven, discussed with the group members to come up with the best answers for the six ethical situations. A constant comparative method was employed to analyze the data. The results revealed multiple compromising solutions for the ethical situations. Details of responses are presented and discussed
A Study of Thai In-Service and Pre-Service Science Teachers’ Understanding of Science Process Skills
No full textAbstractTeaching and learning of science process skills are not only served as basic for the scientific method but also valuable opportunities for learning about the nature of science. These skills divided into two categories; basic and integrated skills, rely on individuals’ intellectual thoughts as well as practical abilities. All science teachers need to develop and be able to use these skills in various science exploratory contexts, and appropriately transfer these skills to students via effective science teaching strategies. Without accurate understandings, it is difficult to practically accomplish the skills. An Understanding of Science Process Skill Test (USPST) was developed corresponding to a Thai context to measure science teachers’ understandings of science process skills. The test was validated by three experienced science educators. The reliability coefficient was 0.869. One hundred and twenty-five in-service and fifty-five pre-service science teachers from the Northern and Western Thailand volunteered to take the test. The results showed that their understandings of each science process skill were ranged from low to highest levels. The in-service teachers showed greater understanding than the pre-service teachers. The implication of teacher education program and teaching training are discussed
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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