浅议当好班主任应把握好的六个度

班主任是班级管理的第一责任人,肩负着一个班级学生的思想引导、习惯培养、学业进步、个性发展的引领统筹责任,需要有深厚的学识魅力和高尚的人格魅力。班主任必须具有丰富的教育智慧,把握好引领学生成长的几个度。做到对学生价值观的引领要有深度,尊重关爱学生要有热度,听取师生意见要有气度,开展班级活动要有广度,班级管理制度实施要有力度,对学生的严格要求要有适度。     

光源啁啾与色散补偿研究

在不考虑光纤中的非线性效应时,通过对高斯和超高斯脉冲光源啁啾的色散理论模型和传输测试分析,得到色散限制关系式,对于色散系数D沿光纤长度z变化的情况,只要光发射机与光接收机间光纤的累积色散∫Ddz小于关系式中所限定的数值,啁啾对脉冲波形的影响就可获得明显减弱,为此给出各种色散补偿方法。     

测试双向可控硅输出电压波形对称性的简便方法

重点介绍使用万用表测量双向可控硅输出电压波形对称性的简单方法.     

人体心肺机能第二拐点与某些生理生化指标的关系

通过采用放射免疫分析（ＲＩＡ）和乳酸分析等方法，对２０名优秀运动员的实验研究，探讨人体心肺机能达到第二拐点时，血中环－磷酸腺苷（ｃＡＭＰ）、环磷酸鸟苷（ｃＧＭＰ）、乳酸水平、以及吸氧量（绝对值和相对值）、氧脉博等指标的变化，以初步揭示人体机能第二拐点与某些生理生化指标的关系。实验结果表明：人体机能达第二拐点时，以上指标各参数值均明显高于运动起始时刻的数值（Ｐ＜０．００１）。此刻人体所承受的生理负荷强度已达到无氧阈平均水平以上，机体已由有氧供能为主过渡到无氧代谢占优势。     

脉搏对高校田径训练强度的监控及与负荷强度对应模型的构建

对普通高校田径运动员训练过程中的脉搏进行实时监控,并根据安静时脉搏、最高脉搏与训练时脉搏的关系,制作脉搏与负荷强度对应表,进一步强化科学化训练理念,为田径运动训练提供科学化参考依据.     

离子液体-石墨烯修饰碳纤维微电极电化学性能研究

本实验制备了离子液体-石墨烯修饰碳纤维微电极,采用循环伏安法和差分脉冲伏安法测定多巴胺(DA)在该修饰电极上的电化学行为。实验结果显示,修饰后电极的稳定性和重现性明显增加,DA在修饰电极上的氧化过程受扩散控制。在5×10-7-1×10-4mol/L浓度范围内,DA在修饰电极上的氧化峰电流与其浓度呈现良好的线性关系。     

Sample Size Calculations for Precise Interval Estimation of the Eta-Squared Effect Size

Analysis of variance is one of the most frequently used statistical analyses in the behavioral, educational, and social sciences, and special attention has been paid to the selection and use of an appropriate effect size measure of association in analysis of variance. This article presents the sample size procedures for precise interval estimation of eta-squared and partial eta-squared in fixed-effects analysis of variance designs. The desired precision of a confidence interval is assessed with respect to (a) the control of expected width and (b) the tolerance probability of interval width within a designated value. In addition, sample size calculations for standardized contrasts of treatment effects and corresponding partial strength of association effect sizes are also considered.     

测量系统分析(MSA)在烟草数字投影仪测量能力分析中的应用

为了解测量系统中各波动源大小及其对测量结果的影响程度,介绍测量系统能力分析RR等测量指标,并对实验室烟草数字投影仪的测量能力进行了测量系统分析评价。以烟草制丝加工过程中的叶丝宽度指标为例,应用测量系统分析评价实验室烟草数字投影仪测量能力,使用测量系统分析方法,分析MINITAB软件生成的结果,找出测量过程中的波动源和影响程度,为实验室烟草数字投影仪的使用提供帮助。     

站在时代前沿的成功探索--试论张育瑄新闻佳作《艺惊西非的友好使者》

本文论述了张育瑄在采写《艺惊西非的友好使者》时进行的新闻探索,新闻作品要想富有生命力,必须站在时代前沿,厚积薄发,并善于捕捉现场细节,增强作品感染力。     

Anticipatory postural adjustments during cutting manoeuvres in football and their consequences for knee injury risk

Abstract

Anticipatory postural adjustments (APAs), i.e. preparatory positioning of the head, the trunk and the foot, are essential to initiate cutting manoeuvres during football games. The aim of the present study was to determine how APA strategies during cutting manoeuvres are influenced by a reduction of the time available to prepare the movement.

Thirteen football players performed different cutting tasks, with directions of cutting either known prior to the task or indicated by a light signal occurring 850, 600 or 500 ms before ground contact.

With less time available to prepare the cutting manoeuvre, the head was less orientated towards the cutting direction (P = 0.033) and the trunk was even more rotated in the opposite direction (P = 0.002), while the foot placement was not significantly influenced. Moreover, the induced higher lateral trunk flexion correlated with the increased knee abduction moment (r = 0.41; P = 0.009).

Increasing lateral trunk flexion is the main strategy used to successfully perform a cutting manoeuvre when less time is available to prepare the movement. However, higher lateral trunk flexion was associated with an increased knee abduction moment and therefore an increased knee injury risk. Reducing lateral trunk flexion during cutting manoeuvres should be part of training programs seeking the optimisation of APAs.