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.     

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,     

大学生脊柱弯曲体育康复矫正效果的观察

[目的]为探讨大学生脊椎弯曲体育康复矫正效果,进行了实验研究.[方法]采用体育康复训练法,对30名大学生进行了为期14周的脊柱弯曲体育康复矫正实验.[结果]颈前屈平均减少0.87 cm,P<0.01,并有16名脊柱弯曲过大的大学生恢复到正常范围,肺活量平均增加76 m l,P<0.01.[结论]脊柱弯曲体育康复矫正训练对大学生具有一定的效果,同时对肺活量的增加等也有一定的作用.     

轮滑教学中造成运动损伤的原因及其预防

作为一项新兴时尚运动,轮滑进入课堂也只是近几年的事.因为该项运动的特点,学生在运动中极易受伤.针对这一现状,作者对怀化学院04、05级选修轮滑课学生运动损伤的情况进行了调查,认为不能掌握正确的运动技术、准备活动不充分、场地器材的质量较差、身体机能欠佳是发生运动损伤的主要原因,并针对上述原因提出了相关的预防措施.     

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.     

影响老年人从事健身锻炼的因素分析

从身体器官、运动素质、运动技能等方面对老年人的体质状况和心理状况进行分析．探讨老年人从事体育锻炼的能力和影响老年人健身锻炼的因素。     

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。