Lucas多项式的性质

本文在研究Fibonacci多项项若干性质的基础上，给出了Lucas多项式Ln（x）的定义及其有关性质。     

NO3^-对B-Z振荡反应的影响及其在分析中的应用

研究了NO3^-对B-Z化学振荡反应的影响．结果表明：NO3^-的加入明显改变该振荡反应的诱导期,且诱导期的改变值△tin与所加入NO3^-的浓度有良好的线性关系,线性范围3．334×10^-5-1．000×10^-3mol·L^-1,相关系数为0．9959．NO3^-CH2（COOH）2-KBrO3-H2SO4-Ce（SO4）2振荡体系诱导期表观活化参数Ein为109．1kJ·mol^-1．     

也谈归纳法的有效性证明问题

归纳法曾受到英国哲学家休谟的质疑,在哲学史上对归纳法有效性的证明也存在许多争论.运用唯物辩证法从归纳客体、认识与实践、归纳与演绎关系、逻辑蕴涵四个维度对归纳法有效性进行证明,并对其在实际操作中有效性的保证措施及其在科学发现中的合理运用策略作出探讨.     

工频炉高压起动柜控制系统研究

工频炉现在使用越来越广泛,但起动异常和烧高压起动柜中电抗器等现象一直是困扰生产的首要问题。通过对某机修厂铸铁车间工频炉起动异常和烧高压起动柜中起动电抗器情况的分析,制定了高压起动柜控制系统的改进方案,通过增设保护电路和报警电路等装置,提高了设备运行的稳定性。     

Fibonacci序列{F_(kn r)}模F_n~2的同余式

利用Fibonacci序列的定义及基本性质得到了Fibonacci序列{F_(kn)}模F_n~2的同余式和序列{F_(kn r)}的递归关系,然后归纳得出了{F_(kn r)}模F_n~2的同余式的一般情况,并证明了其正确性.     

Facilitators or suppressors: Effects of experimentally induced emotions on multimedia learning

The present study investigated the influence of experimentally induced emotions (positive, neutral, negative) on learning with multimedia instruction with N = 75 university students. In order to provide sound explanations about how emotional state might impact learning, measures of motivation, cognitive load, and attentional processes (eye tracking) were integrated. Results showed that while emotions did not influence retention, emotions did influence outcomes of the comprehension and transfer test. Specifically, a facilitating effect of an induced negative emotional state on learning outcomes was observed, which could be attributed to a more focused and detailed information processing. In contrast, an induced positive emotional state had a suppressing effect on learning outcomes since learners were distracted from the learning materials by their emotions. Motivational measures were not influenced by learners' different emotional states, but overall, controlled motivation increased and autonomous motivation decreased during learning. In sum, the learners' emotional state should be considered in learning research as an important predictor for learning success.     

Partnering with Districts to Expand an After-School Maths Club Programme

Abstract

A key intervention of the South African Numeracy Chair Project (SANCP) since 2011 has been the introduction of mathematics (or maths) clubs, which occur in the out-of-school time space. In 2016 the maths club concept was developed into a 15-week Pushing for Progression (PfP) teacher development programme which supports primary school mathematics teachers to run clubs beyond the SANCP local area. Expanding intervention models beyond local schools is imperative in the second phase of the SANCP (2016–2020). Working from a mixed methods methodological approach, the researchers collected pre- and post-data for a 4-operations assessment of the entire PfP programme. In this article they share learner data from one of the nine teachers who participated in the PfP maths club programme in the Uitenhague District, Eastern Cape, South Africa, to illuminate how partnerships between academics, district officials and teachers can enable powerful student learning in the club space. They argue further that within the tightly focused development programme run by teachers in this one district, it is possible for learners to make substantive progress in mathematical proficiency (MP) (especially procedural fluency and conceptual understanding) when comparing scores and learner methods between a pre- and post- assessment.     

The Perceptions of Success Inventory for Beginning Teachers: Measuring its psychometric properties

This study investigated the construction and evaluation of an instrument called the Perceptions of Success Inventory for Beginning Teachers (PSI-BT) intended to measure factors documented in research that contribute to beginning teachers’ perceptions of success. The PSI-BT was found to assess the following factors using exploratory factor analysis: (1) Administrative Support, (2) Classroom Climate, (3) Mentor Support, (4) Colleague and Instructional Resource Support, (5) Commitment, and (6) Assignment and Workload. Internal reliability, content validity, and concurrent validity were also measured in the validation process. Our findings suggest that the PSI-BT provides a reliable and valid instrument that can provide schools with valuable feedback to ensure the success of their beginning teachers.     

异步电动机重合闸综合实验研究

研究异步电动机重合闸过程,提出解决合闸过程中冲击电流过大的方法,以此为模本设计异步电动机重合闸实验,开发工程技术性的新类型电机实验。该实验的实现过程从实际的电机工程应用技术出发,按工程需要模块化地揉合相关课程,充分调动学生的创新性综合思维能力,有益于培养基础扎实、创新意识强、动手能力高的应用型优秀电气工程技术人才。     

On-line broken-bar fault diagnosis system of induction motor

Induction motor faults including mechanical and electrical faults are reviewed. The fault diagnosis methods are summarized. To analyze the influence of stator current, torque, speed and rotor current on faulted bars, a time-stepping transient finite element (FE) model of induction motor with bars faulted is created in this paper. With wavelet package analysis method and FFT method, the simulation result of finite element is analyzed. Based on the simulation analysis, the on-line fault diagnosis system of induction motor with bars faulted is developed. With the speed of broken bars motor changed from 1 478 r/min to 1 445 r/min, the FFT power spectra and the wavelet package decoupling factors are given. The comparison result shows that the on-line diagnosis system can detect broken-bar fault efficiently.