Predictive value of ventilatory inflection points determined under field conditions

The aim of this study was to evaluate the predictive potential provided by two ventilatory inflection points (VIP₁ and VIP₂) examined in field without using gas analysis systems and uncomfortable facemasks. A calibrated respiratory inductance plethysmograph (RIP) and a computerised routine were utilised, respectively, to derive ventilation and to detect VIP₁ and VIP₂ during a standardised field ramp test on a 400 m running track on 81 participants. In addition, average running speed of a competitive 1000 m run (S_1k) was observed as criterion. The predictive value of running speed at VIP₁ (S_VIP1) and the speed range between VIP₁ and VIP₂ in relation to VIP₂ (VIP_SPAN) was analysed via regression analysis. VIP_SPAN rather than running speed at VIP₂ (S_VIP2) was operationalised as a predictor to consider the covariance between S_VIP1 and S_VIP2. S_VIP1 and VIP_SPAN, respectively, provided 58.9% and 22.9% of explained variance in regard to S_1k. Considering covariance, the timing of two ventilatory inflection points provides predictive value in regard to a competitive 1000 m run. This is the first study to apply computerised detection of ventilatory inflection points in a field setting independent on measurements of the respiratory gas exchange and without using any facemasks.     

标记性及其在母语迁移中的作用

母语迁移是二语习得研究中的重要领域之一。语言学和认知学理论将标记性纳入母语迁移的研究中。语言学以母语与目的语之间的标记差异做比较,说明母语迁移的可能性;认知学则以母语特征的典型范畴为基点,分析二语学习者对母语迁移的选择性。标记性理论的提出对英语教学和对外汉语教学有着十分重要的启示。     

修辞中受众心理实探

受众对修辞本文(话语)的接受反应是修辞主体(言语调适者)在修辞活动中的主要参照系。本文旨在将受众的某些心理因素(思维方式、需要、态度、性格等个性心理和审美心理等)纳入修辞研究的视野,并探讨它们对修辞效果的影响。     

基于三坐标测量仪的特征线数据采集方法

阐述了三坐标测量仪数据采集在逆向工程中的重要作用.通过研究三坐标测量仪数据采集的基本原则和路径规划方法,提出了基于三坐标测量仪的特征线数据采集方法,实现了基于三坐标测量仪的简单型面及自由曲面的数据快速采集.     

基于MOOC的教学改革及对高校青年教师能力的影响研究

近几年,随着互联网技术的长足发展,MOOC已经成为潮流,高校青年教师面对这种新兴事物的冲击应该如何应对,以及其对教学内容改革的促进,对青年教师的能力影响成为未来决定高校教学质量及未来发展的关键,如何适应高校教育发展的需要,利用互联网技术的优势,改革教学方法、提升教学能力已成为每一位高校青年教师思考的问题。     

使用燃煤添加剂降低锅炉大气污染物的排放

介绍了蓝天牌消烟缚硫剂(添加剂)消烟除尘及固硫的机理以及该产品的实际使用效果和存在的不足之处.     

试论清末女子学校教育

清末女子学校教育是近代妇女解放的发端，其显特征是：1、戊戌维新时期女子学校教育与新化事业并进，呈现出贵族化倾向；2、辛亥女子学校教育与前相比各种矛盾日益突出。     

应用型人才培养中案例教学的组织与实施

案例教学作为一种提高学生思考问题和解决问题能力行之有效的教学方法,在高校人才培养过程中得到了广泛应用。案例教学在高职教学中有着更大的发挥空间。基于教学实践,在高职案例教学适切性分析的基础上就高职案例教学的组织和实施进行了探讨。     

关于中国古代小说起源的再思考

小说史研究于古代小说起有史传说与神话说等，有关稗官的考证在一定程度上也影响着研究对小说起源的认知。本在前人研究的基础上，通过对已有考证的剖析，试从先秦两汉化背景的视角透视古小说的起源。     

A dynamic decision model for portfolio investment and assets management

This paper addresses a dynamic portfolio investment problem. It discusses how we can dynamically choose candidate assets, achieve the possible maximum revenue and reduce the risk to the minimum level. The paper generalizes Markowitz's portfolio selection theory and Sharpe's rule for investment decision. An analytical solution is presented to show how an institutional or individual investor can combine Markowitz's portfolio selection theory, generalized Sharpe's rule and Value-at-Risk(VaR) to find candidate assets and optimal level of position sizes for investment (dis-investment). The result shows that the generalized Markowitz's portfolio selection theory and generalized Sharpe's rule improve decision making for investment.