试论新课程视野中的学习理论和学习方式

改变学生的学习方式、提高学生的学习能力是新一轮课程改革的关键。对新课程视野中的学习理论、学习方式含义与类型的分析与探讨,有助于我们把握新课程改革中学生学习的特点,以全面提高学生的学习能力。     

A microfluidic device for simultaneous measurement of viscosity and flow rate of blood in a complex fluidic network

Blood viscosity has been considered as one of important biophysical parameters for effectively monitoring variations in physiological and pathological conditions of circulatory disorders. Standard previous methods make it difficult to evaluate variations of blood viscosity under cardiopulmonary bypass procedures or hemodialysis. In this study, we proposed a unique microfluidic device for simultaneously measuring viscosity and flow rate of whole blood circulating in a complex fluidic network including a rat, a reservoir, a pinch valve, and a peristaltic pump. To demonstrate the proposed method, a twin-shaped microfluidic device, which is composed of two half-circular chambers, two side channels with multiple indicating channels, and one bridge channel, was carefully designed. Based on the microfluidic device, three sequential flow controls were applied to identify viscosity and flow rate of blood, with label-free and sensorless detection. The half-circular chamber was employed to achieve mechanical membrane compliance for flow stabilization in the microfluidic device. To quantify the effect of flow stabilization on flow fluctuations, a formula of pulsation index (PI) was analytically derived using a discrete fluidic circuit model. Using the PI formula, the time constant contributed by the half-circular chamber is estimated to be 8 s. Furthermore, flow fluctuations resulting from the peristaltic pumps are completely removed, especially under periodic flow conditions within short periods (T < 10 s). For performance demonstrations, the proposed method was applied to evaluate blood viscosity with respect to varying flow rate conditions [(a) known blood flow rate via a syringe pump, (b) unknown blood flow rate via a peristaltic pump]. As a result, the flow rate and viscosity of blood can be simultaneously measured with satisfactory accuracy. In addition, the proposed method was successfully applied to identify the viscosity of rat blood, which circulates in a complex fluidic network. These observations confirm that the proposed method can be used for simultaneous measurement of viscosity and flow rate of whole blood circulating in the complex fluid network, with sensorless and label-free detection. Furthermore, the proposed method will be used in evaluating variations in the viscosity of human blood during cardiopulmonary bypass procedures or hemodialysis.     

关于大力发展桂林户外运动产业的研究

当今社会,户外运动作为最时尚、最健康的运动之一,受到越来越多消费群体的青睐,并且创造了良好的经济效益和社会效益。文章以桂林的户外运动为研究对象,阐述桂林发展户外运动产业的优势和制约因素,文章在此基础上提出发展对策,这对桂林的旅游产业乃至经济社会的发展具有重要的战略意义。     

武术与跆拳道教学理念的对比分析

中华武术是我国众多优秀传统文化中的一枝奇葩,它几乎涵容了中国传统文化的各种成分和要素,其完善的锻炼系统和神奇的健身与攻防效果是任何一项体育项目不可与之相提并论的;武术历来被视为全面发展学生体质的重要手段,然而,传统的武术教学已不被大多数学生接纳。相反,刚传入我国不久的跆拳道却正在全国范围内蓬勃发展,这里面的原因值得我们深思。     

皖北汉族女生月经初潮与形态发育分析

报道了1997年皖北地区汉族女生生长发育的调查结果,调查指标为身高、体重和月经初潮。城乡学生初潮年龄分别为12．71岁和13．33岁,比较了来潮组和未来潮组学生身高和体重的差异,并对差异的可能原因进行了分析。     

我国体育中介机构发展的类型与模式

采用调查、文献资料等研究方法,结合我国体育市场发展的实际,揭示了我国体育中介机构面临的主要问题,分析了我国体育中介机构发展的主要类型与模式。     

运用现代教育技术促进学生多元智能发展实践模式探究

当前风靡于世界的国际教育新理念——多元智能理论是一个较为完备的理论体系，该理论的内涵与我国目前正在倡导实施的素质教育有着密切的内在联系，是对素质教育的最好诠释。现代教育技术与多元智能发展之间也有着天然的、密切的关系，在促进多元智能发展方面具有多维多面的作用。积极探索运用现代教育技术促进多元智能发展的实践模式，它对于促进学生多元智能的发展，实施和推进素质教育具有直接的指导、整合和引领作用。     

第九届健美操世界锦标赛女子单人项目难度动作分析比较

采用录像解析法、对比分析法、文献资料法,对第九届健美操世界锦标赛女单冠军和我国选手难度动作进行比较分析。结果表明：我国选手所选难度动作不缺组,分布较为均衡,但与冠军难度动作相比,难度级别明显较低,且难度级别分布明显成下降趋势,难度动作的完成与冠军选手还有一定的差距。     

NBA 停摆自组织特点分析

文章采用文献资料法、逻辑分析法以及自组织理论的相关原理对 NBA 停摆的自组织特点进行了分析,探讨了 NBA 停摆自组织形成的条件、演化动力以及有序发展的原因。研究认为 NBA 联盟停摆的整个过程具备了自组织演进发展的条件,劳资双方的纠纷最终目的就是在出现新的问题时,通过进一步的合作协商,摒弃落后的协议,在新的环境下达成双方利益上的一种平衡态。     

体育科技英语文献阅读理解方法与技巧

本文依据英语阅读理解一般方法与技巧，结合体育科技英语文献特点，对体育科技英语文献阅读方法与技巧从词、词组、句子、段落、篇章等各层次进行了阐述与探讨。