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纳米抗菌陶瓷与人们健康、环境保护密切相关,被人们称为21世纪的陶瓷.概述了国内外现阶段的抗菌剂、抗菌陶瓷的灭菌原理和用途,展望纳米抗菌陶瓷的开发前景. 相似文献
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以功能性氧化锌为填料,以偏高岭土为基料,用水玻璃激发后与EVA乳液进行复合,再加入助剂等,形成一种具有抗菌性能的地聚合物涂层。系统研究了该涂料的吸水率、光泽度、附着力、硬度、韧性等性能,为新型抗菌涂料的制备和应用奠定有效的理论基础。 相似文献
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通过太子参白茶5个不同浓度的溶冲液对酿酒酵母菌、青霉、黑曲霉、金黄色葡萄球菌、藤黄八叠球菌、枯草杆菌、大肠杆菌、铜绿假单胞菌、青色链霉菌等九种菌的抑菌活性进行研究,结果表明5种不同浓度的太子参白茶溶冲液对九种受试菌都有抑菌作用,其中4倍液为真菌与细菌的最好的抑菌浓度． 相似文献
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通过抑菌环检验方法 ,测试了各种镀层 (锌、钴、镍、铬、金、银、镍 钴合金、钴 镍合金、铜、SUS30 4不锈钢 )的抗菌性能 .抑菌环检验的结果表明 ,锌、钴、钴 镍合金、镍 钴合金、银、铜镀层具有明显的抗菌活性 ,SUS30 4不锈钢、铬镀层没有抗菌活性 .同时研究了镀层的抗菌性能与相应的稳定电位之间的关系 ,发现镀层的稳定电位越负 ,对应的镀层抗菌活性越高 相似文献
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乌贼墨中抗菌活性成分的应用研究 总被引：1，自引：0，他引：1
王劲松 《荆门职业技术学院学报》2008,23(12)
研究了乌贼墨中抗菌活性物质的提取及其抗菌活性。乌贼墨中抗菌活性物质的提取分离方法,根据Mochizuki的方法稍作改变。乌贼墨中抗菌活性物质为黄色吸潮性粉末,该物质的得率为0.52%,对细菌和真菌有抑菌作用。最后对其抑菌特性进行了研究。 相似文献
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随着我国经济的发展和人民生活水平的提高,人们的环境意识有了很大的改变,对陶瓷的性能也提出了进一步的要求。纳米与抗菌技术相互结合应用在陶瓷生产中,将极大地改善传统陶瓷的性能。本文主要介绍其抗菌机理及在国内外陶瓷生产中的应用现状,并探讨了纳米抗菌技术在陶瓷生产中存在的问题以及抗菌纳米陶瓷的发展前景。 相似文献
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AbstractAcross the globe, education has recently been through a major semantic shift, where new notions such as ‘learning’, ‘competences’, ‘projects’ came to replace or complement an older, more established, educational vocabulary. The political approach to education has also evolved, as many authors have underlined, from established national forms of governing to global, transnational forms of governance. These evolutions, often abbreviated to shifts ‘from teaching to learning’ and ‘from governing to governance’ have resonated globally and attracted the attention of researchers. Most sociological accounts of such evolutions attribute them to the development and primacy of a preponderant logic, generally politics/power, culture or the economy. Niklas Luhmann’s systems theory, on which we draw in this article, suggests to start from a different, opposite, premise: not the predominance but instead the lack of any predominant logic characterizes modernity. The functional differentiation of modern society into a multiplicity of—specific yet universal—systems should therefore be the pivotal point that helps make sense of these transformations. We argue that the very coexistence of such systems, their simultaneous and therefore uncoordinated existences, increases the complexity of the social world tremendously and leaves them with an uncertain future. The so-called turns to governance and to learning, we argue, should be understood, respectively, as political and educational attempts to deal with this loss of direction. 相似文献
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孙长明 《山东教育学院学报》2007,22(4):12-14
《西湖主》作为《聊斋志异》中的经典篇目之一,在艺术上取得了高度的成就。可以说,凡《聊斋志异》所取得的艺术成就——诸如情节曲折紧凑、人物栩栩如生、语言准确生动等等,在《西湖主》中均有不同程度的体现,前人已多有论述。本文拟利用现代小说理论,从环境描写和叙事学理论入手,从一个新的角度来分析《西湖主》的独特艺术成就。 相似文献
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Developing a Theoretical Framework for Response: Creative Writing as Response in the Year 6 Primary Classroom 
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下载免费PDF全文 Tom Dobson 《English in Education》2015,49(3):252-265
Focusing on the creative writing of Year 6 boys as they make the transition to Year 7, this article establishes a theoretical model for creative writing as response. In line with Bakhtin's notion of utterances as ‘interpersonal’ (1986), the model demonstrates the complexity of creative writing – the text is influencing of and influenced by an author's participation in ‘figured worlds’ (Holland, Lachicotte, Skinner and Cain 1998), but also influencing of and influenced by future respondents. This article suggests that ‘weaker framing’ (Bernstein 2000) in creative writing pedagogy has the potential to alter boys' identities and refigure their worlds. 相似文献
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Nesta Devine 《Educational Philosophy and Theory》2013,45(4):383-395
Abstract In this article I attempt to engage with Charlotte Brontë as both a teacher and a philosopher. In her depiction of two impoverished gentlewomen as teachers Brontë is, as is often pointed out, drawing on her own history, but she is also exploring two conflicting contemporary philosophic notions: the romantic ideal and the ideal of rationality, as they are played out in the lives of women. Brontë uses the plot device of taking her teachers into new environments, from where as strangers they can report to the reader on the conditions they experience. But the teachers are also strangers in the teaching environments of their employment and, moreover, as individuals are stripped of all familial and social support. While her pedagogic strategies may not be appealing to twentieth century tastes, Brontë and her creations still have something to say about the issues, choices and constraints faced by young and inexperienced teachers, and the available subject-positions teachers may construct for themselves as they grapple with their own foreignness in their classrooms or other teaching situations. 相似文献
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Leslie Jordan Albert Camille S. Johnson 《Decision Sciences Journal of Innovative Education》2011,9(3):421-436
Many universities are pursuing increases in on‐line course offerings as a means of offsetting the rising costs of providing high‐quality educational opportunities and of better serving their student populations. However, enrollments in online courses are not always sufficient to cover their costs. One possible way of improving enrollments is through marketing campaigns targeted to specific demographic groups. In this study, we take a first look into how students’ perceptions of e‐learning systems, prior to their enrollment in an online course, vary across socioeconomic status and gender. Findings suggest that prior to taking an online course, working‐class students perceive e‐learning systems more positively than their middle‐class peers but that little difference exists between genders. Armed with this knowledge, universities may improve online course enrollments by marketing online courses specifically to working‐class students or through campaigns aimed at improving middle‐class students’ perceptions of e‐learning systems. 相似文献
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This article reports on a participant‐centred research project with English teachers in a senior secondary college in Melbourne, Australia. It builds on previous research (Weaven and Clark 2009, 2011), which showed a low take‐up of the opportunities to teach poetry in Victoria's senior secondary English curriculum. This study explores the reasons why teachers of English are unwilling to use poetry texts in their senior classes. The teachers who participated in this study discussed and documented their attitudes towards the teaching of poetry and explored with each other the pedagogical challenges associated with teaching poetry. Their discussions – an analysis of which forms the empirical core of this article – reveal a range of explanations for teachers' reservations about offering poetry to their students. Importantly, these teachers were able to use professional discussion as a means to consider what changes in teaching practice could be successfully developed to facilitate more time spent on the teaching of poetry in senior secondary classes. 相似文献
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Articles discussing and analysing student peer-review activities proliferate the educational literature, typically describing one or more class exercises where students provide feedback on each other’s work. These papers usually focus on a peer-review activity designed as a scholarly study, and make conclusions about its success or otherwise. There is not one standard model for ‘peer-review’, and information on the many different assessment designs used is distributed over an increasing number of publications and websites. This paper provides a meta-review of peer-review activities as they are implemented in practice, using configuration data from over a thousand assignments conducted using an online peer-review system during an eight-year period. We present data on the wide variety of assignment designs and the parameters that comprise them, their rubrics, and comparisons between subject areas. Information on the norms and range of all decisions to be made will encourage instructors (both new to and experienced in conducting peer-review activities) to reflect on and justify the choices they make. 相似文献
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试论蛙类生活习性的多样性 总被引：1，自引：0，他引：1
丁建发 《宁德师专学报(自然科学版)》2004,16(4):361-363
从捕食、冬眠、繁殖等方面探讨蛙类生活习性的多样性．蛙类幼体(蝌蚪)的食性有杂食性、植食性和肉食性3种类型，成体主要以活动的动物为主食．各种蛙冬眠期的长短和起止时间不相同，同一种蛙，开始冬眠和苏醒的迟早，也因地区而异．1只性成熟的雌蛙一年可产卵2次或2次以上；各种蛙类每1雌体的1次产卵数量悬殊很大；大多数蛙类的产卵期为每年的4～8月间，但一年四季都有蛙类产卵；蛙类的产卵场所可分为水内产卵和水外产卵2大类；蛙类产卵的全过程包括呜叫求偶、抱对、产卵动作等． 相似文献
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Interpretive responses to images in picture books by primary and secondary school students: Exploring curriculum expectations of a ‘visual grammatics’ 下载免费PDF全文
下载免费PDF全文 As well as maintaining the central role of literature, the new Australian Curriculum: English emphasises the multimodal nature of literacy and requires students in primary and secondary schools to develop explicit knowledge about visual and verbal grammar as a resource for text interpretation and text creation. This study investigated the use of visual grammatics in interpreting picture books by students across Years Four, Five, Seven and Ten following an intensive professional learning programme undertaken by their teachers. A proposed framework describes variation in students' interpretive stance from tactical to diegetic to semiotic. Levels of student semiotic understanding are differentiated and differences between students' oral and written interpretations are discussed in relation the need for explicit teaching of written interpretive responses to multimodal literary texts, drawing on an articulated visual and verbal grammatics appropriate to the teaching of English in primary and secondary schools. 相似文献
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This study focuses on student teachers’ team teaching. Two team teaching models (sequential and parallel teaching) were applied by 14 student teachers in a quasi-experimental design. When implementing new teaching models, it is important to take into account the perspectives of all actors involved. Although learners are key actors in the teaching process, their perspective is often ignored. Therefore, the central research question is: How do learners experience sequential and parallel teaching? A questionnaire was administered to the 229 learners participating in the experiment. Exploratory factor analysis and multilevel analysis revealed that both models were evaluated positively. However, parallel teaching scored significantly higher on advantages whereas sequential teaching scored higher on disadvantages. Quantitative content analysis revealed additional information. Benefits of parallel teaching were high levels of concentration and involvement and a positive atmosphere. In sequential teaching, learners appreciated the additional support and variation. Disadvantages of sequential teaching referred to the fact that it was confusing and to differences between both teachers. Learners in parallel teaching disliked the splitting of the class group. They were concerned that both learner groups would not be treated equally. These findings reveal that from the learners’ perspective, parallel teaching should be preferred above sequential teaching. 相似文献