金属中自由电子气能量的研究

本文根据费米气体模型理论,研究金属中自由电子气的能量,讨论电子的最高能量、平均能量和电子气的能级密度.     

河南省地市经济发展水平和区域划分研究

对河南省地市经济发展水平进行评价和区域划分研究.首先建立评价指标体系,然后用主成分分析法对原始数据进行数学处理,得出表示经济水平的综合指标,再用聚类分析方法进行经济发展水平层次和区域的划分.最后分析了河南省经济发展水平地域差异的原因,并提出了河南省发展区域经济、平衡区域差异的基本策略.     

高职贯通培养英语词汇教学策略

针对高职贯通培养学生在英语词汇学习中存在的困难,从英语词汇的语音、词形、语义等知识层面入手,结合语境引入与词汇联想意义,提出相应的英语词汇教学策略,以期夯实贯通培养学生英语基础。     

概率方法建模预测分数线

结合建模的步骤，运用回归分析、假设检验、正态分布等工具预测分数线。     

期货交易与实物交割关系实证研究与交易头寸控制模型

章从交割率计算、持仓量、交易头寸集中水平与实物交割关系入手，实证检验了二的内在高度相关性，指出风险监控应以实物交割安全为中心。要确保实物交割安全，不仅要从交割环节，更应从交易环节做起。并在交易环节构建了以实物交割安全为核心的交易头寸动态控制模型。     

产业结构演变与恩格尔定律

恩格尔定律是描述经济发展水平的综合指标,它与社会经济发展水平和产业结构的演变有着密切的联系．同时也是衡量“小康水平”的一个重要指标。就不同生产发展阶段和产业结构演变过程,通过分析、研究恩格尔定律的发展趋势,提出该定律的局限性,为某地区是否达到“小康水平”做出正确的甄别,     

Prospective primary teachers’ perceptions about the use of mathematics homework

The benefit of homework (HW) has been the subject of ongoing debate among various stakeholders. Within this debate, and in relation to teacher development, prospective teachers’ views of HW have received limited attention. In this study, we survey primary pre-service teachers’ (‘PSTs’) views of HW use (n = 45 teaching grades 2–5; n = 39 teaching grades 6 and 7) in a single discipline (mathematics) at one large Australian university.

The literature suggests students in upper primary and secondary grades will benefit from the use of mathematics HW. Results of the study, in contrast, suggest our PSTs teaching early primary grades planned to give proportionally (but not significantly) more mathematics HW than those teaching later grades. Reasons for this disparity are discussed. We argue there is a need in teacher development to equip PSTs with a better understanding of how classroom and home-based learning work together in the development of mathematical understanding.     

Proportionality Assumption in Latent Basis Curve Models: A Cautionary Note

Latent basis curve models (LBCMs) have been popular in modeling change when the change trajectories are unknown or nonlinear. The estimated change trajectories from LBCMs are often viewed as optimal and used as reference points against which other change trajectories are tested. However, there is a proportionality assumption underlying LBCMs that has received little attention from researchers. This study uses a Monte Carlo simulation to show that violation of this assumption can potentially result in substantially biased estimates of the means and variances of changes and covariate effects on these changes, leading to incorrect statistical inference. The implications of the simulation study are discussed and alternatives to LBCMs are suggested for use when the proportionality assumption is likely to be violated.     

浅析英语中歧义句的产生及其消除办法

任何语言都有歧义现象的存在,英语也不例外。英语歧义句是由多种因素造成的。本文以若干实例从词汇和句法两大因素入手,对英语中歧义句产生的原因及如何消除歧义句作了比较详细的阐述。     

技能主导类项群技战术能力的生理学探析

从生理学角度提出了技能战术能力的概念及其基本特征,分析了技战术形成和发展过程,以及影响技战术能力的关键因素,阐述了技能主导类项群技战术训练应注意遵循的生理学原理,指出加强技战术贮备、技战术实战应用程度力争达到自动化、培养运动员达到优秀或适应技战术要求的技能能级是技战术训练亟待重视的三个重要环节。