360M2烧结机台车的铸造生产     

张进鹏 《安阳工学院学报》2005,(3):17-19

烧结机台车属于耐热铸件,其主要的失效形式是氧化和生长造成的变形和裂纹,必须具有良好的热强度、抗氧化生长、耐热冲击及在循环应力作用下不产生裂纹等综合耐热性能.采用铁素体 珠光体的球墨铸铁,同时加入一定量的合金元素,合金化稳定珠光体,强化工艺措施的方法控制石墨的形态及尺寸,操作过程中严格控制关键工序的工艺规范,配合有力的检测手段,可保证了材质良好的机械强度、组织稳定性和化学稳定性.  相似文献   

Project-based learning in post-WWII Japanese school curriculum: an analysis via curriculum orientations     

Kazuyuki Nomura 《Curriculum Journal》2017,28(4):626-641

In the 2000s, the new national curriculum, dubbed as the ‘yutori curriculum,’ introduced a new subject for project-based learning ‘Integrated Study’ as its prominent feature. Comparing curriculum orientations in project-based learning in three historical periods after the WWII including Integrated Study, this paper aims to offer a genealogy of postwar Japanese school curriculum primarily based on a critical reading of the national curriculum guidelines on project-based learning, which is emblematic of the extending power of postwar Japan's curriculum authorities. Although Integrated Study was purportedly child-centered and put emphasis on each child's personal relevance and each school's autonomy, the finding of this study shows that Integrated Study in the yutori curriculum was rather a technology that disciplined schools, teachers, and classroom processes to shape children into morally good and cognitively flexible Japanese nationals. Despite its rhetoric of child-centeredness and personal relevance, the introduction of Integrated Study as part of the yutori curriculum was ultimately part of the state's move to gain further control over schooling.  相似文献   

Engendering a culture of thinking in a culture of performativity: the challenge of mediating tensions in the Singaporean educational system     

Mohammad Akshir Ab Kadir 《Cambridge Journal of Education》2017,47(2):227-246

Among the major policies that have been implemented to ensure its continued success, Thinking Schools, Learning Nation (TSLN) has been described as the ‘big bang of educational reforms’ in Singapore. However, while the policy aims to develop critical thinkers in school leavers, the corporatisation of education in the shape of structures such as the school excellence model seems to be at odds with TSLN. This paper argues that these structures unwittingly engender a culture of performativity among schools, marginalising the central outcome of its initiative that entails developing a culture of thinking and thinkers. The tension is further exacerbated by the larger rationalities that have shaped Singapore and the pragmatic and instrumental philosophy which underpins its educational system. The tensions generated by the clash between intended (culture of thinking) and engendered culture (culture of performativity) present the challenge of mediation for the system on its path to realising TSLN.  相似文献   

GiveMe Shelter: a people-centred design process for promoting independent inquiry-led learning in engineering     

Mark Dyer  Thomas Grey  Oliver Kinnane 《European Journal of Engineering Education》2017,42(6):729-744

It has become increasingly common for tasks traditionally carried out by engineers to be undertaken by technicians and technologist with access to sophisticated computers and software that can often perform complex calculations that were previously the responsibility of engineers. Not surprisingly, this development raises serious questions about the future role of engineers and the education needed to address these changes in technology as well as emerging priorities from societal to environmental challenges. In response to these challenges, a new design module was created for undergraduate engineering students to design and build temporary shelters for a wide variety of end users from refugees, to the homeless and children. Even though the module provided guidance on principles of design thinking and methods for observing users needs through field studies, the students found it difficult to respond to needs of specific end users but instead focused more on purely technical issues.  相似文献   

Embellishing Problem-Solving Examples with Deep Structure Information Facilitates Transfer     

Hee Seung Lee  Shawn Betts  John R. Anderson 《Journal of Experimental Education》2017,85(2):309-333

Appreciation of problem structure is critical to successful learning. Two experiments investigated effective ways of communicating problem structure in a computer-based learning environment and tested whether verbal instruction is necessary to specify solution steps, when deep structure is already embellished by instructional examples. Participants learned to solve algebra-like problems and then solved transfer problems that required adjustment of learned procedures. Experiment 1 demonstrated that verbal instruction helped learning by reducing learners' floundering, but its positive effect disappeared in the transfer. More importantly, students transferred better when they studied with examples that emphasized problem structure rather than solution procedure. Experiment 2 showed that verbal instruction was not necessarily more effective than nonverbal scaffolding to convey problem structure. Final understanding was determined by transparency of problem structure regardless of presence of verbal instruction. However, verbal instruction had a positive impact on learners by having them persist through the task, and optimal instructional choices were likely to differ depending on populations of learners.  相似文献   

A construct‐modeling approach to develop a learning progression of how students understand the structure of matter     

《科学教学研究杂志》2017,54(8):1024-1048

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Graduate learning outcomes in science: variation in perceptions of single- and dual-degree students     

Lucie S. Dvorakova 《Assessment & Evaluation in Higher Education》2017,42(6):900-913

The development of transferrable skillsets, articulated in statements of graduate learning outcomes, is emphasised in undergraduate science degree programmes. Science students enrolled in dual (double) degrees comprise a significant minority of Australian science undergraduates. Research comparing perceptions of single and dual degree students on their science learning outcomes has rarely been explored. The Science Students Skills Inventory was used to compare the perceptions of single (n = 640) and dual (n = 266) degree undergraduate science students. The instrument explored science graduate learning outcomes across six indicators: importance; the extent to which outcomes were included; the extent to which they were assessed; improvement; confidence; and likely future use. Analysis of findings, employing the planned–enacted–experienced curricula framework, offers insight into potential avenues towards coherence of the experienced curriculum by arguing the need for shared perceptions of graduate learning outcomes for single and dual degree science students. The key contribution of this study is a shift towards progressive curriculum development that draws on both single and dual degree student perspectives to achieve graduate learning outcomes. Recommendations include: whole-of-programmes curricular pathways premised on progressive development of learning outcomes that are inclusive of dual degree students, explicit interdisciplinary learning opportunities, and adoption of dual/single status as a demographic variable reported in future research.  相似文献   

Language use and racial redirect in the educational landscape of ‘just good teaching’     

Tonda Liggett  Dyan Watson  Linda Griffin 《Teaching Education》2017,28(4):393-405

At colleges and universities across the United States, teacher preparation programs are increasingly required to prepare teachers for culturally and linguistically diverse student populations. Teacher education programs have responded by incorporating fieldwork experiences and curricular requirements that include a social justice and multicultural education focus. One key individual is uniquely positioned to reinforce and connect coursework with classroom practice during the teacher candidate’s practicum experience: the university supervisor. Our research team focused on the supervisors and their understandings of culturally responsive pedagogy (CRP) in order to better support them as they worked with teacher candidates to reinforce CRP in the classroom. Through interviews, field notes, and classroom observations, we examined language (words, phrases) that the supervisors used to talk about race and culture in relation to CRP. Our findings indicate a tendency to redirect conversations about race and culture to topics that they were more versed on such as teaching to the whole child or addressing the needs of the individual student. We termed this linguistic move the racial redirect, which emerged in language that (1) simplified the meaning of CRP and (2) made CRP seem like an unexpected or chance event in teaching.  相似文献   

A Path to Designing Inquiry Activities in Mathematics     

M. Greene 《PRIMUS》2017,27(7):646-668

Abstract

This paper aims to illustrate a design cycle of inquiry-based mathematics activities. We highlight a series of questions that we use when creating inquiry-based materials, testing and evaluating those materials, and revising the materials following this evaluation. These questions highlight the many decisions necessary to find just the right tasks for our students. Throughout the paper the use of multiple representations (graphical, numerical, symbolic, and narrative) and the distinction between facts, skills, methods, and conceptual understanding is explained and illustrated with examples. Additionally, we present evidence of student learning through excerpts from student journals and exam analysis.  相似文献   

Settler grammars and the Australian professional standards for teachers     

Nikki Moodie  Rachel Patrick 《Asia-Pacific Journal of Teacher Education》2017,45(5):439-454

In 2011, the Australian Institute for Teaching and School Leadership introduced new Professional Standards for Teachers, which require that graduate teachers possess knowledge and understanding of Indigenous students and cultures. The authors conducted interviews with 12 non-Indigenous teacher educators at one Australian university in order to understand how these Standards are interpreted and implemented. We adopt Calderon’s framework of settler grammars to interpret the dialectic of presence and absence that teacher educators in our study describe. Extending this frame to an analysis of the Australian Professional Standards for Teachers, we find that settler grammars function to simultaneously erase Indigenous claims to sovereignty and epistemological equality, whilst promoting a representation of Indigenous people that asserts the primacy of the settler colonial state.  相似文献