三元二次多项式分解的一种方法

利用待定系数法得出了三元二次多项式可进行因式分解的充要条件，并应用这个充要条件解决了两个具体问题。     

认知语境下的新型话语误解

近年来认知语境成为了倍受瞩目的理论,在话语理解的分析中得到了广泛的应用,然而话语误解尤其是由于科技的进步、时代的发展而出现的话语误解的新形式却很少有人提及.本文尝试从认知语境的角度,用认知语境的建构因素对几个典型的新型话语误解进行分析.     

Bilingual language development: what do early years practitioners need to know?

This paper considers what early years practitioners need to know about bilingual acquisition. It argues that bilingualism is not only an asset in the classroom and the community, but also an individual and family achievement that requires commitment and determination. The different contexts of bilingual acquisition are considered, along with the implication for a successful outcome. In particular, given our current understanding of the processes of language acquisition, the role of the input in each of the two languages will be discussed; the implications of this for early years teachers/practitioners are also considered in order to find the most effective ways of supporting bilingual development in the classroom.     

农业投入产出变量的主成分回归分析模型

运用主成分回归分析方法,建立了关于我国农业投入产出诸变量的回归模型,同时消除了多重共线性,并且模型都达到了很高的拟合优度,体现了主成分回归分析在消除回归模型中的多重共线性的优越性.研究具有一定的实际意义,可用于对农业产出进行预测及控制.     

言语交际中情态助动词can的模糊限制功能

本文以言语交际中的情态助动词can为研究对象,借助语料,分析在不同语境条件下的模糊限制功能:使言语更礼貌;提高言语的表达效果;提高言语关联性。     

Environmental literacy of youth movement members – is environmentalism a component of their social activism?

Youth-movements in Israel are non-formal organizations that educate for social and political involvement and provide a broad platform for youth involvement in the community. This study explored the question: does the social activism of adolescents who both elect for membership in youth movements and a leadership role of instructing younger members also reflect itself in environmentalism? In a survey of 1496 young instructors drawn from 15 official youth movements, findings on environmental literacy variables show youth are only generally knowledgeable about environmental problems; express ‘technical-optimism’ which leads them to limited concern for the environment; show limited recognition of the importance of environmental education, and show limited acknowledgment of the necessity for changes in personal consumerism. Findings also show that environmental issues are not on their mind since they are not a conversation topic with peers or family. Nonetheless, these youth also demonstrate strong self-efficacy to effect change; view themselves as role models for younger members; and express willingness to include environmentally-supportive activities within regular youth movement activities. Their valuing of nature also provides a foundation for building other environmental values. Further analysis shows how these findings can contribute theoretical and practical tools for incorporating sustainability within the youth movement framework, and help realize their potential for promoting sustainability in society.     

从记忆的工作机理谈影响英语听力的三个变量

听力是语言交际能力的中心环节之一, 在听的过程中记忆是重要的信息储存器和处理器, 在记忆的工作过程中有三个关键变量影响了听力的效果。因此, 在英语听力的课堂教学中应帮助学生合理分布注意力, 增加短期记忆的储存量, 提高长期记忆的信息加工能力。     

Swarm intelligence for mixed-variable design optimization

Many engineering optimization problems frequently encounter continuous variables and discrete variables which adds considerably to the solution complexity.Very few of the existing methods can yield a globally optimal solution when the objective functions are non-convex and non-differentiable.This paper presents a hybrid swarm intelligence approach(HSIA)for solving these nonlinear optimization problems which contain integer,discrete,zero-one and continuous variables.HSIA provides an improvement in global search reliability in a mixed-variable space and converges steadily to a good solution.An approach to handle various kinds of variables and constraints is discussed.Comparison testing of several examples of mixed-variable optimization problems in the literature showed that the proposed approach is superior to current methods for finding the best solution,in terms of both solution quality and algorithm robustness.     

多空间融合视域下学习环境及学习情境探究

互联网、人工智能、大数据、云计算、物联网等技术的教育应用逐渐走向纵深,使得学习环境发生了深刻的变革,亟需探究符合时代背景、面向新型学习环境的教与学交互理论,探究如何设计学习环境来应对新兴技术支持的学习情境。通过分析学习情境的基本特征,探究多空间融合后学习情境革新带来的学习环境设计原则的变化。基于新技术、新理念、新方法等对教与学影响的思考,最终提出学习情境的描述框架。学习情境是一种复杂的网络现象,基于互联网技术、人工智能、大数据分析储存技术等的应用,学习情境客观存在于虚拟环境中,成为一种具有目标性的长期存在的学习活动,借助互联网实现教学知识传播与知识共享,并可以实时进行学习分析、导航、评估、反馈、调节等,学习情境成为学习的连接器和促进有效学习的助推器。     

多元函数极值判别法推广

利用代数中的正定阵对多元函数的极值的判别法作一些推广