共查询到19条相似文献，搜索用时 171 毫秒
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在半环上引入粗糙集并研究了粗糙子半环;利用半环的非空子集上关于同余关系的上、下近似,给出了半环的粗糙子半环的定义,证明了半环的子半环、理想一定是半环的粗糙子半环、粗糙理想。 相似文献
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半环的粗糙性质 总被引：1，自引：0，他引：1
朱天民 《渭南师范学院学报》2007,22(2):22-24
研究了半环的粗糙子半环和粗糙理想的性质；利用半环的非空子集上关于同余关系的上、下近似，给出了半环的粗糙子半环的定义，证明了半环的子半环、理想一定是半环的粗糙子半环、粗糙理想. 相似文献
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将粗糙集的理论方法用于模糊半环的研究．首先,给出上（下）粗模糊子半环及上（下）粗模糊理想等概念,并研究了它们的性质．随后,证明了上粗模糊子半环与上粗模糊理想是通常的模糊子半环与模糊理想概念的扩张,进一步丰富了代数中粗糙集理论． 相似文献
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谢蓓蓓 《南阳师范学院学报》2002,1(6):8-11
在交换半环与其乘法集合的卡氏积上定义了一种等价关系，从而构造了一类新的交换半环－分式半环。讨论了交换半环与其分式半环之间的关系，刻划了分式半环的泛性质。最后，在两个可换可消半群的直积上定义相同的关系，证得该关系为群同余，并得到相近的结果。 相似文献
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利用各种类型的理想刻划了π-正则半环和内禀正则半环。本文的结果推广和扩充了CHRISTOPH DNQES,M.Shabir,A.Ali和Samian Batool分别在1994年和2004年给出的对正则半环和内禀正则半环的一些相关结果. 相似文献
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本文通过讨论幂等元半环与分配格的性质,研究它们的相似与不同之处,找出幂等元半环成为分配格的条件。 相似文献
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在抽象代数的基础上,结合其他学科背景,提出了抽象矩阵的概念,给出了不同于数值矩阵的几种抽象矩阵,如格值矩阵、半环值矩阵、伪半环值矩阵,并介绍了其基本性质。 相似文献
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《南阳师范学院学报》2018,(3):1-3
研究了加法半群是带、乘法半群是完全正则半群的半环上的格林关系,对L∨D进行了刻画,给出了L_d是半环簇CR(3,1)的子簇所满足的等式类,最后得到了该子簇的Mal’cev积分解. 相似文献
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同余是研究半环结构的主要工具,而分配格是一类特殊的半环．文章主要借助文献[3]中的方法,定义交换分配半环上的一个同余。并且验证该同余是最小分配格同余． 相似文献
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指出了两给定集合之间所有二元关系集合在通常集合的并和交运算下构成一个布尔代数 .给出了有限集合上二元关系的关系矩阵行列式和秩的定义 ,讨论了它们的一些性质 .并给出了关系矩阵加法和乘法的定义 ,证明了有限集合上所有二元关系的关系矩阵集合在上述加法和乘法下构成一个半环 . 相似文献
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任芳 《福建工程学院学报》2012,10(6):529-532,587
证明任意半环上的半模范畴是加性regular范畴,并给出半模的函子表示。证明了加性regular范畴关于伴随对的左右平凡扩张范畴是同构的。最后应用至半模范畴,得到半环S的半模范畴S-S Mod关于Hom函子Homs（M,）的左平凡扩张范畴HomS（M,）∝S-SMod和S-SMod关于张量函子M×S-的右平凡扩张范畴S-SMod∝×S-是范畴等价。 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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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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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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《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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Hammer N Löffler S Feja C Sandrock M Schmidt W Bechmann I Steinke H 《Anatomical sciences education》2012,5(4):225-233
Anatomical fixation and conservation are required to prevent specimens from undergoing autolysis and decomposition. While fixation is the primary arrest of the structures responsible for autolysis and decomposition, conservation preserves the state of fixation. Although commonly used, formaldehyde has been classified as carcinogenic to humans. For this reason, an adequate substitute was developed. Ethanol-glycerin fixation and thymol conservation are described and compared with formaldehyde and phenol in this technical report. The setup, tissue qualities, financial aspects, and health concerns of this method are discussed. Ethanol-glycerin fixation and thymol conservation provide outstanding haptic and optic tissue qualities. Typical formaldehyde and phenol effects, such as skin, airway, and eye irritation, as well as carcinogenic effects, can be circumvented by using ethanol-glycerin and thymol instead. Ethanol-glycerin fixation is more expensive than formaldehyde and requires an explosion-proof facility. However, the absence of health effects and its convincing tissue qualities balance these higher costs. Therefore, ethanol-glycerin fixation and thymol conservation provide a potential alternative and complement established fixation techniques. The use of carcinogenic formaldehyde and toxic phenol can be effectively restricted through the use of the described method. 相似文献