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1.
研究了消声器外罩级进模的成形工艺及模具结构方案。制约级进模成形的主要因素有料带整体排样、拉深方式、冲压方向以及工步设置等,拉深工序是最关键的环节。对两种拉深成形方案进行了试验研究,得出了合理的拉深方案、排样、下料尺寸、压边力大小以及其他相关工艺参数,确定了优化方案。同时研究了成形过程中的起皱现象,认为拉延筋的设置是一种较优的解决手段,经过分析确定了拉延筋的参数及布置方式。 相似文献
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刘莉莉 《河南职业技术师范学院学报》2000,28(2):39-41
对通过试验机获取的实测拉深冲压力行程曲线进行分析，找出拉深系数与拉深冲压力之间更深层内在联系，归纳出不同拉深系数值、不同拉深次数下拉深冲压力随凸模行程的不同变化规律，为使拉深工艺设计更趋于合理、完善提供了参考依据。 相似文献
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针对拖拉机覆盖件尺寸大、厚度薄、表面质量要求高,加工工序繁多,加工过程中易产生的起皱、破裂、减薄等质量问题的特点,以典型的拖拉机后围板为例,使用DYNAFORM软件模拟不同压边力的拉深过程,对成形极限图（FLD）和材料厚度图进行分析发现：调整压边力可以消除后围板拉深成形中易出现的起皱和破裂问题。用此法能显著加快模具设计的进程,并为模具数字化设计提供借鉴。 相似文献
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刘莉莉 《河南科技学院学报》2000,28(2):39-41
对通过试验机获取的实测拉深冲压力行程曲线进行分析,找出拉深系数与拉深冲压力之间更深层内在联系,归纳出不同拉深系数值、不同拉深次数下拉深冲压力随凸模行程的不同变化规律,为使拉深工艺设计更趋于合理、完善提供了参考依据。 相似文献
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本文通过采用几种润滑剂分别进行不同的冷冲压拉深试验,测定了极限拉深系数等参数.实践及研究表明垫聚乙烯干膜润滑拉深对各种板材及不同的拉深成形方法都起到了提高其拉深性能的作用,对此还作了一些分析探讨,提出了相应的建议. 相似文献
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该文通过对拉深时压边力情况进行分析,对一般弹性压边装置存在的问题进行改进,实现了在拉深过程中压边力的恒定,提高中小型零件的拉深成形质量。 相似文献
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镁合金的塑性变形条件比较复杂。为方便在万能试验机上开展镁合金板材拉深成形实验研究,本文设计了一套适用于镁合金拉深的试验系统,系统包含了拉深成形、温度控制和压边力控制三个模块,利用该系统进行了镁合金板材拉深实验,取得了较为满意的效果。 相似文献
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James P. McDaniel 《Quarterly Journal of Speech》2013,99(1):48-66
This essay attempts to counter the dreariness of postmodern critique and culture by locating the vital force of phantasy, rhetoric, argument, hope, and memory in contemporary public affairs. More particularly, it engages recent controversies about collective memory and the FDR memorial statue especially to generate a greater sensitivity to the fact that we are agents (and not just dupes) of history. The body, symbolic and material, is a core site for the history, theory, and practice of democracy, I argue, and is the hard kernel of collective identification and division. Methodologically, the essay fuses Aristotle and Lacan's ideas about phantasy as a perceptual device, which gages and creates public and personal desire, as an analytic frame for the study of public discourse. 相似文献
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Femke Bannink Koenraad Stroeken Richard Idro Geert van Hove 《International Journal of Disability, Development & Education》2015,62(2):182-201
This article describes the findings of a qualitative study on knowledge, beliefs, attitudes, and practices towards children with spina bifida and hydrocephalus in four regions of Uganda. Focus group discussions and semi-structured interviews were held with parents of children with spina bifida and hydrocephalus, policy-makers, and service providers. Our findings describe how negative knowledge, beliefs, attitudes, and practices create barriers to treatment and inclusion of children with spina bifida and hydrocephalus and their parents in Uganda. The findings show how knowledge, beliefs, attitudes, and practices evolve over time, are both similar and differ in the various regions, and become more conducive towards accessing treatment and achieving inclusion. Sensitisation and early intervention including parents and service providers in dissemination of knowledge, rehabilitative care to set the trend for positive change and support, as well as longitudinal studies of children with spina bifida and hydrocephalus and their parents are recommended. 相似文献
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《British Journal of Educational Studies》2001,49(2):213-238
Books reviewed:
Richard Edwards and Robin Usher, Globalisation and Pedagogy: Space, place and identity
Jackie Brine, Educating Women: Globalizing Inequality
David Carr, Professionalism and Ethics
Andrew Pollard and Ann Filer, The Social World of Pupil Career: Strategic Biographies through Primary School
Bernard Crick, Essays on Citizenship
Mike Bottery and Nigel Wright, Teachers and the State: Towards a Directed Profession
Stephen Heathorn, For Home, Country and Race: Constructing Gender, Class and Englishness in the Elementary School 1880-1914
Jane M. Page, Reframing the Early Childhood Curriculum: Educational Imperatives for the Future
Leslie P. Steffe and Patrick W. Thompson (eds), Radical Constructivism in Action
Patricia Broadfoot, Marilyn Osborne, Clare Planel and Keith Sharpe, Promoting Quality in Learning – Does England have the Answer?
Claire Cameron, Peter Moss and Charlie Owen, Men in the Nursery: Gender and Caring Work
Mike Cole (ed), Education, Equality and Human Rights
R. Alexander, P. Broadfoot and D. Phillips, Learning from Comparing: New Directions in Comparative Educational Research , Volume 1 Contexts, Classrooms and Outcomes
OECD, Learning to Bridge the Digital Divide 相似文献
Richard Edwards and Robin Usher, Globalisation and Pedagogy: Space, place and identity
Jackie Brine, Educating Women: Globalizing Inequality
David Carr, Professionalism and Ethics
Andrew Pollard and Ann Filer, The Social World of Pupil Career: Strategic Biographies through Primary School
Bernard Crick, Essays on Citizenship
Mike Bottery and Nigel Wright, Teachers and the State: Towards a Directed Profession
Stephen Heathorn, For Home, Country and Race: Constructing Gender, Class and Englishness in the Elementary School 1880-1914
Jane M. Page, Reframing the Early Childhood Curriculum: Educational Imperatives for the Future
Leslie P. Steffe and Patrick W. Thompson (eds), Radical Constructivism in Action
Patricia Broadfoot, Marilyn Osborne, Clare Planel and Keith Sharpe, Promoting Quality in Learning – Does England have the Answer?
Claire Cameron, Peter Moss and Charlie Owen, Men in the Nursery: Gender and Caring Work
Mike Cole (ed), Education, Equality and Human Rights
R. Alexander, P. Broadfoot and D. Phillips, Learning from Comparing: New Directions in Comparative Educational Research , Volume 1 Contexts, Classrooms and Outcomes
OECD, Learning to Bridge the Digital Divide 相似文献
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创新源于实践 总被引：68，自引：66，他引：68
杨叔子 《实验室研究与探索》2004,23(7):1-3
从理性上分析了文化的知识、思维、方法和精神4个层面的内涵及其相互关系。并提出学习和知识，思考和思维，实践和方法三者的关系。其中学习、知识是基础，思考、思维是关键，实践、方法是根本。创新来源于实践，一切文化来源于实践。在素质教育中应处理好学习、思考和实践的关系。 相似文献
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作文教学的改革应该是一个系统的工程,它涉及了写作的思想与方法、过程与评价、反馈与矫正,还涉及了吸纳与输出、积累与整合、应用与拓展、发现与创新等方面的研究与改革。新课程理念下对作文的创新评价应从评价理念人本化、评价功能激励化、评价主体多元化、评价内容综合化、评价形式民主化、评价方法多样化等方面来进行,以激发学生自主写作、快乐写作的欲望,让学生在写作的实践过程中抒写自我的心灵感受,实现人格与能力的和谐发展。 相似文献
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Bronwyn Bevan 《Studies in Science Education》2017,53(1):75-103
Making is a rapidly emerging form of educational practice that involves the design, construction, testing, and revision of a wide variety of objects, using high and low technologies, and integrating a range of disciplines including art, science, engineering, and mathematics. It has garnered widespread interest and support in both policy and education circles because of the ways it has been shown to link science learning to creativity and investigation. Making has taken root in out-of-school settings, such as museums, science festivals, and afterschool and library programmes; and there is now growing interest from primary and secondary educators in how it might be incorporated into the classroom. Making expands on traditions associated with Technology Education and Design-Based Learning, but differs in ways that can potentially broaden participation in science and STEM learning to include learners from communities historically underrepresented in STEM fields. STEM-Rich Making is centrally organised around design and engineering practices, typically integrating digital tools and computational practices, and positions scientific and mathematical concepts and phenomena as the materials for design. This paper takes a critical view of the claims about Making as a productive form of science teaching and learning, and reviews the current research literature’s substantiation of the ways in which Making supports students’ agency, promotes active participation in science and engineering practices, and leverages learners’ cultural resources. 相似文献
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对西安市七区全民健身场所年龄分布、健身规律以及对健身功能的认知进行问卷调查，进行数理统计后，结合有关献进行分析。结果发现经济压力和生活压力，健身观念以及生活习惯，健身理论研究、健身运动的组织以及宣传等政府行为，工作性质以及工作时间等均对全民健身的开展有着不同程度的影响。建议政府、单位、社会结合，开发新运动项目、制定运动处方，并加大宣传力度，全面深入地开展群众性体育竞赛，促进全民健身从“我为”向“为我”转化，必能促进全民健身活动健康、有序地开展。 相似文献
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Adopting a person-centered approach, we profiled 5th and 6th grade children's (152 boys and 161 girls) school-related beliefs about perceived task difficulty and agency beliefs in ability and effort. Five clusters were compared across key learning-related dimensions encompassing underlying worldviews (means–ends beliefs, normative difficulty, nature of ability), motivation (intrinsic, identified, introjected, and extrinsic), and adjustment (achievement and well-being): Agentic (high ability, high effort, low difficulty), Strivers (above average ability, high effort, high difficulty), Normative (average ability, effort and difficulty), Disengaged (low ability, low effort, average difficulty) and Challenged (low ability, low effort, high difficulty). The findings suggest that difficulty, perceived either as challenge or obstacle, plays an important role for the belief profiles, and that relationships with worldviews and motivation are indicative of adaptation and maladaptation. 相似文献
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《British Journal of Educational Studies》1997,45(1):83-116
Buckingham, David Moving Images: Understanding Children's Emotional Responses to Television
Aldrich, Richard (ed) In History and in Education: Essays presented to Peter Gordon
Kohli, Wendy (ed) Critical Conversations in Philosophy of Education
Griffiths, Morwenna Feminisms and the Self: the web of identity
Fryer, Marilyn Creative Teaching and Learning
Atkinson, Paul; Davies, Brian and Delamont, Sara (eds) Discourse and Reproduction: Essays in Honour of Basil Bernstein
Slee, Roger Changing Theories and Practices of Discipline
Woods, Peter and Jeffrey, Bob Teachable Moments: The Art of Teaching in Primary Schools
Best, Ron (ed) Education, Spirituality and the Whole Child
Bassey, Michael Creating Education Through Research
Higham, Jeremy; Sharp, Paul and Yeomans, David The Emerging 16–19 Curriculum: Policy and Provision
Bruner, Jerome The Culture of Education
Halsall, Rob and Cockett, Mike (eds) Education and Training: Chaos or Coherence
McBride, Rob (ed) Teacher Education Policy
Wideen, Marvin F. and Grimmett, Peter P. (eds) Changing Times in Teacher Education
Nixon, Jon; Martin, Jane; McKeown, Penny and Ranson, Stewart Encouraging Learning: towards a theory of the learning school
Gewirtz, Sharon; Ball, Stephen, J. and Bowe, Richard Markets, Choice and Equity in Education 相似文献
Aldrich, Richard (ed) In History and in Education: Essays presented to Peter Gordon
Kohli, Wendy (ed) Critical Conversations in Philosophy of Education
Griffiths, Morwenna Feminisms and the Self: the web of identity
Fryer, Marilyn Creative Teaching and Learning
Atkinson, Paul; Davies, Brian and Delamont, Sara (eds) Discourse and Reproduction: Essays in Honour of Basil Bernstein
Slee, Roger Changing Theories and Practices of Discipline
Woods, Peter and Jeffrey, Bob Teachable Moments: The Art of Teaching in Primary Schools
Best, Ron (ed) Education, Spirituality and the Whole Child
Bassey, Michael Creating Education Through Research
Higham, Jeremy; Sharp, Paul and Yeomans, David The Emerging 16–19 Curriculum: Policy and Provision
Bruner, Jerome The Culture of Education
Halsall, Rob and Cockett, Mike (eds) Education and Training: Chaos or Coherence
McBride, Rob (ed) Teacher Education Policy
Wideen, Marvin F. and Grimmett, Peter P. (eds) Changing Times in Teacher Education
Nixon, Jon; Martin, Jane; McKeown, Penny and Ranson, Stewart Encouraging Learning: towards a theory of the learning school
Gewirtz, Sharon; Ball, Stephen, J. and Bowe, Richard Markets, Choice and Equity in Education 相似文献
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《信阳师范学院学报(哲学社会科学版)》2018,(1):64-68
构建现代大学制度的过程就是对现行大学制度不断变革和完善的过程。大学制度变革要面临大学与政府、大学与社会、大学内部学术与行政之间的价值差异,具体表现为自治与控制、超越与适应、自由与秩序之间的价值差异。每一种价值都有其局限性和合理性,不能简单地肯定一个而否定另外一个。自治、超越、自由是基于大学本位的价值追求,因此要以自治、超越、自由为重心,通过大学制度创新调整大学与政府、大学与社会、学术与行政之间的关系,寻求自治与控制、超越与适应、自由与秩序之间的平衡。 相似文献