微型电解刻印仪

本文要介绍的微型电解刻印仪,是由一个印章式刻印器和一个专用电源组成,利用电解加工技术在各种金属材料上刻印图文,该装置结构简单,操作方便,并且便于携带。它可广泛应用于机械制造的各个领域。该装置在1989年获国家专利。本文主要介绍其工作原理,机械结构,电路组成及应用。     

金属材料工程特色专业建设

本文介绍了特色专业建设的重要性。并针对我校金属材料工程专业,从人才培养方案、师资队伍、课程建设、实践教学、教学方法和手段以及教学管理等方面对金属材料工程特色专业的建设进行了阐述。     

广州城区居民食用蔬菜重金属含量现状分析

通过对广州城区各居民菜场主要蔬菜进行采样,分析其中的Pb,Cd,Cr,Ni,Cu,Zn重金属含量水平,结果显示,Pb、Cr、Cd为广州市蔬菜的主要污染元素,其超标率分别达到22.2%、38.9%和13.9%。根茎类蔬菜的污染程度大于叶菜类和瓜果类。利用单因子污染指数法进行了评价,发现广州市蔬菜的污染比例在50%以上,其中28.9%为轻度污染。Cr与Zn、Cu之间存在极显著相关性,Cu、Zn之间存在显著相关性。     

茶叶中重金属检测研究概述

从样品的前处理和检测方法两个方面综述了茶叶中重金属的检测。前处理方法包括灰化法、消化法、微波消解、高压消解、酸提取法及悬浮液直接进样法等,检测方法包括原子光谱法、电化学法、电感耦合等离子体质谱法和分光光度法等。     

Mycorrhizoremediation an enhanced form of phytoremediation

Study of plant roots and the diversity of soil micro biota, such as bacteria, fungi and microfauna associated with them, is important for understanding the ecological complexities between diverse plants, microbes, soil and climates and their role in phytoremediation of contaminated soils. The arbuscular mycorrhizal fungi （AMF） are universal and ubiquitous rhizosphere mi- croflora forming symbiosis with plant roots and acting as biofertilizers, bioprotactants, and biodegraders. In addition to AMF, soils also contain various antagonistic and beneficial bacteria such as root pathogens, plant growth promoting rhizobacteria including free-living and symbiotic N-fixers, and mycorrhiza helping bacteria. Their potential role in phytoremediation of heavy metal （HM） contaminated soils and water is becoming evident although there is need to completely understand the ecological complexities of the plant-microbe-soil interactions and their better exploitation as consortia in remediation strategies employed for contaminated soils. These multitrophic root microbial associations deserve multi-disciplinary investigations using molecular, biochemical, and physiological techniques. Ecosystem restoration of heavy metal contaminated soils practices need to incorporate microbial biotechnology research and development. This review highlights the ecological complexity and diversity of plant-microbe-soil combinations, particularly AM and provides an overview on the recent developments in this area. It also discusses the role AMF play in phytorestoration of HM contaminated soils, i.e. mycorrhizoremediation.     

A queer circle of friends,indeed! The school social as intervention or as movement

The purpose of this paper to present two approaches intended to support the social lives of those typically on the borders of school life. Circles of friends (CoFs) was designed to assist students labelled with disabilities, while Gay-straight alliances (GSAs) addresses needs of supporting students who identify as lesbian, gay, bisexual, transgender, two-spirited (gay/lesbian/bisexual First Nations people), queer and/or those questioning their sexual identity (LGBTTQQ). In laying out these approaches side by side, I argue that CoFs constitute a dis/abling pedagogy breed acquiescence, further pathologise students and create essentialised identification for all students. GSAs, in contrast, are constitutive of a queer pedagogy and promote active, agentive, healthy more complex identities. In short, CoFs are critiqued through GSAs and implications for inclusive schooling are explored.     

International perspectives on student awareness,experiences and perceptions of research: implications for academic developers in implementing research‐based teaching and learning

This paper explores the implications of the effective integration of research, teaching and learning for academic development through the lens of an international multi‐institutional comparison of student perceptions of research and its impact on their learning environment. The study, with a sample of over 500 final‐year undergraduate students across three institutions in the UK and Canada, represents a spectrum of research and teaching intensive universities and is one of the largest exploring undergraduate student perceptions of research in the linking teaching and research literature. The results indicate a complex relationship between student perceptions and experiences of research and the type of institution, as well as the individual, institutional and national context. They also inform the discussion of particular issues that academic developers face and the strategies they use to improve the integration of research and teaching to benefit the undergraduate learning experience in their institution.

Cet article explore les implications, pour le développement pédagogique, de l’intégration effective de la recherche, de l’enseignement et de l’apprentissage à l’aide de la lentille d’une comparaison internationale multi institutionnelle des perceptions étudiantes à l’égard de la recherche et de leur impact sur l’environnement d’apprentissage. L’étude, reposant sur un échantillon de plus de 500 étudiants en dernière année de 1^er cycle, provenant de trois institutions au Royaume‐Uni et au Canada, représente un spectre d’universités centrées sur l’enseignement ou sur la recherche. L’étude constitue une des recherches les plus importantes au sujet des perceptions étudiantes à l’égard de la recherche dans la littérature portant sur le lien entre l’enseignement et la recherche. Les résultats indiquent une relation complexe entre les perceptions et les expériences des étudiants, et le type d’institution, de même qu’avec les contextes individuel, institutionnel et national. Les résultats contribuent aussi à la discussion de questions particulières auxquelles les conseillers pédagogiques font face ainsi que les stratégies que ceux‐ci utilisent en vue d’améliorer l’intégration de la recherche et de l’enseignement de façon à en faire bénéficier l’expérience d’apprentissage au 1^er cycle au sein de leur institution.     

Higher education curriculum orientations and the implications for institutional curriculum change

This research is based on an empirical study exploring how academics make curriculum decisions and their perceptions of the influences that shape their decisions. Interviews were held with 20 academics from diverse disciplines, who were both research active and committed to teaching. The higher education curriculum was conceptualised as a field of decision-making shaped by academics’ beliefs about educational and contextual influences. The study identified five distinctive curriculum orientations representing coherent patterns of curriculum decisions aligned with academics’ beliefs about educational purposes. Case studies are presented to elucidate each of the curriculum orientations. Curriculum orientations were also found to shape academics’ responses to educational change. The following higher education change drivers are explored: graduate employability and the skills agenda, teaching–research relationships, changing understandings about teaching and learning, educational technologies and flexible delivery. The findings suggest implications for institutional curriculum change initiatives and academic development programmes.     

‘Go over there and look at the pictures in the book’: an investigation of educational marginalisation,social interactions and achievement motivation in an alternative middle school setting

The middle years of school represent a time of educational turbulence, serving to marginalise some students from educational opportunities. Much research has focussed on individual cognitive factors influencing educational engagement, with less attention directed towards social interactions. Theoretically positioned within an expectancy–value model of achievement motivation, this study draws on the lived experience of a 12-year-old student within an alternative school in South Australia, Australia, to explore how social encounters may contribute to educational marginalisation. Findings from a narrative case study employing a semi-structured interview suggested that connections exist between social influences, such as interactions with teachers and peers, and subsequent achievement motivation. This study suggests that social interactions are critical determinants to an individual's educational engagement, affecting educational ability, expectancy and value beliefs.