广义Lucas数列的求和公式

由二次线性递推公式所定义的Lucas数列{Fn}在数学的理论研究中有重要的作用,不少学者对这个数列的一些特征进行了深入细致的研究.本文在已有的有关广义Lucas数列相关定理的基础上进一步推广,给出了更为广泛的广义Lucas数列的求和公式,采用了递推归纳的方法证明.     

英藏S2204《董永变文》董永至孝感天意义分析

英藏《董永变文》是敦煌文献中极具俗文学文献研究价值的写卷.尽管该作品受到佛教的影响,但诸如“孤儿”、“至孝”、“感天”等具有本质意义的内容以及有关我国传统民俗与民族的信仰的文化信息几乎没有改变.在董永故事中,“孤儿”经验的痛苦召唤着人类最初的良知与恻隐,孤儿对“天”的诉求,更无限地触及着人们的孤儿情结与渊源久长的弱者经验.《董永变文》依然延续了“孤儿”文学这一主题,强调董永“年登十五二亲亡”,是一个需要上天关爱与呵护的对象——“孤儿”;至于董永“卖身葬父”最基本的价值则在于“至孝”;董永“至孝”的文化意义,不仅仅在于对父母的感恩,还有一个更为隐秘的重要目的,即“感天”,取得具有血缘关系的祖神或者称之为“天”的佑护.     

Exploring the Disciplined Nature of Self-Study Research in Teacher Education

This article reports a study of literacy instruction in our own elementary preservice program. It examines the views and practices of both the preservice faculty who teach literacy and a sample of graduates of the program during their first three years of teaching. The new teachers reported learning many things from their preservice program, including the importance of engaging learners, strategies for developing an inclusive class community, the names of high-quality works of children's literature, and a variety of general teaching strategies. However, there were gaps between what was taught and what the new teachers wanted to learn. The new teachers struggled with program planning, desired more direct instruction on developing a literacy program, and wanted closer links between theory and practice. The teacher educators tried to cover so much material that the new teachers were unable to develop a focused, coherent pedagogy. The authors describe how they are revising their courses in light of these findings, modifying their approach to preservice instruction, and giving priority to certain key aspects of teaching.     

The implications of the out-of-field phenomenon for effective teaching,quality education and school management

Abstract

The out-of-field phenomenon, that is the situation where teachers teach outside their field of expertise, adds complexity to the education environment and affects learners, colleagues, parents, governing bodies and school management. It puts extra strain on school management's responsibility to provide quality management and jeopardises effective teaching and quality learning. This article examines the implications of the out-of-field phenomenon for school management. An empirical investigation entailing the use of a qualitative approach was employed for the study. Data were gathered through semi-structured interviews with selected participants who shared their experiences of the phenomenon. Findings indicated that the out-of-field phenomenon and its implications should be recognised in order to provide effective and quality teaching, substantial teacher support and sufficient staff development programmes.     

高等植物花发育的分子生物学研究

综合介绍了高等植物花发育的特点、开花诱导途径、花/花序分生组织形成、花器官发育的分子生物学研究。高等植物的开花诱导有四个促进开花的途径:光周期途径、春化途径、自主途径和赤霉素途径。这些途径通过某些整合基因共同调控植物的开花转换,如FT、LFY、SOC1和FLC等。在花/花序分生组织形成过程中,LFY、AP1等基因发挥着重要作用,它们是花/花序分生组织特异基因。花器官的发育由A、B、C、D、E等五类基因控制,它们调控着花萼、花瓣、雄蕊、心皮的发育。     

Remaking the Germans

Studies have shown that teacher quality is the single greatest factor affecting student achievement. However, it is not simply enough to recruit highly qualified candidates and place them into the schools where they are needed the most; the United States needs a system to support and retain these teachers. This essay posits that school districts need to implement and sustain a comprehensive induction system, which fosters professional learning communities through a network of supports, to retain highly qualified teachers.     

The importance of networks for newly qualified teachers in upper secondary education

Background and purpose:?The interest in raising the competence of teachers through networks and network activities is increasing. This article is based on the voices of four newly qualified teachers who give us the opportunity to listen to experiences in authentic surroundings. The purpose of this article is to gain better insight into the type of networks newly qualified teachers maintain, develop and create to develop as teachers. The research question is: What is the importance of networks for the professional development of newly qualified teachers in upper secondary education?

Main argument:?The main finding of the article, based on in-depth interviews with four newly qualified teachers, is that being acknowledged by colleagues is decisive for professional development. Furthermore, the school’s programme of meetings to some extent contributes to developing the respect and trust of the newly qualified teachers, who also need to find time and opportunities for reflection in personal networks outside school. The relational and emotional aspects of the teaching profession produce a need for guidance processes where the ethical dilemmas of the profession can be raised. When these dilemmas arise, the newly qualified teachers actively look outside school to grasp opportunities for professional development. The teachers appear to be very active in their own professional development, and they have ambitions to develop as teachers for the benefit of the pupils and the school.

Conclusions:?Systematic guidance is highlighted as fundamental for these teachers’ learning.     

大学生初级剑锻炼情绪诱导作用及开展对策的研究

通过对大学生初级剑锻炼诱导情绪的即时效果调查与分析,探讨初级剑锻炼的情绪诱导作用及开展对策。结果表明,一次性初级剑练习可使人精神得到恢复和激发,并使人产生良好的情绪唤醒作用,适宜于学校课外及大课间活动的开展。     

Slip energy recovery of a rotor-side field oriented controlled wound rotor induction motor fed by matrix converter

This paper investigates rotor-side field oriented control of a wound-rotor induction motor using the slip energy recovery principle. The proposed drive system uses a matrix converter to transfer the slip energy from the rotor into the mains instead of using ac-dc-ac converter whilst the stator side is fixed to the grid. Operation at both subsynchronous and supersynchronous regions is possible with the proposed drive system. Simulation studies of the proposed doubly fed induction motor drive system verify the good control performance of the system in transient and steady-state conditions.     

乳糖诱导Pfu DNA聚合酶基因的表达及酶的纯化

利用乳糖诱导重组大肠杆菌BL21(DE3)中Pfu DNA聚合酶基因的表达。对诱导菌株起始生长量、乳糖浓度和诱导持续时间进行了优化,尝试使用JK110弱阳离子交换柱和Sephadex G-75凝胶层析柱来分离纯化Pfu DNA聚合酶,并用PCR扩增实验检测酶活性。结果表明乳糖可以有效诱导Pfu酶的表达,JK110离子交换柱有较好的纯化效果,从500 mL培养液中可以得到3×105U的酶活,比活达22,200 U/mg,结果好于IPTG诱导表达。