“黑箱理论”视阈下阳光体育开展审视与立体式阳光体育长效发展模式构建

采用文献资料、访谈调查等研究方法,借鉴"黑箱理论",从阳光体育开展的"输出端"和"输入端"两个视角进行分析研究五年来阳光体育的实施效果和影响因素。基于调查存在的问题,提出建构包括学校、家庭和社会在内的全方位、多层次、宽领域的立体式阳光体育长效发展模式,为下一阶段阳光体育运动的开展提供理论参考。     

体育教师继续教育实效性策略浅探

体育教师参加继续教育是终身教育的要求,是切实提高教师素质的需要,是教师职业专业化发展的必然趋势。建设一支高质量的师资队伍,是全面推进素质教育、彻底落实新课程改革的基本保证。本文分析了体育教师继续教育现状和现有体制及存在的主要问题,进行调查分析的基础上提出改进体育教师继续教育的对策。     

创设支持性活动环境培养幼儿音乐节奏感

节奏被称作音乐的骨骼,是音乐情绪和风格的重要表现手段,培养幼儿的节奏感,可以使幼儿体验感受节奏在音乐艺术中的情绪,感受节奏美。本文从支持性物质活动环境的创设和支持性精神活动环境的创设两个方面进行研究,旨在促进幼儿教师在教学过程中能够自觉地创设支持性活动环境,进而使幼儿在这种轻松愉快的环境中,更好的开发其音乐节奏感潜质。     

解读Devitt和Sterelny对建构主义的批判

Devittt[1]以自然主义观点的立场,选择第一哲学作为切入点,对建构主义进行了批判.Devitt认为,建构主义的错误在于"从语言的指称观点出发,混淆了世界和关于世界的说法的区别."这里着重介绍自然主义的捍卫者 Devitt & Sterenly 对建构主义的哲学批判,使建构主义的研究者们得以从理论的哲学源头对其重新审视,以期有所裨益.     

Current status and development of percutaneous coronary intervention in China

##正##Dr.Gruntzig et al.(1979) successfully completed the world's first percutaneous coronary intervention (PCI),a percutaneous transluminal coronary     

Mathematical models of canine right and left atria cardiomyocytes

The aim of this study is to build two mathematical models of canine ionic currents specific to right atria and left atria.The canine left atria mathematical model was firstly modified from the Ramirez-Nattel-Courtemanche(RNC) model using the recently available experimental data of ionic currents and was further developed based on our own experimental data.A model of right atria was then built by considering the differences between right atria and left atria.The two developed models well reproduced the exper...     

Neurochip based on light-addressable potentiometric sensor with wavelet transform de-noising

Neurochip based on light-addressable potentiometric sensor(LAPS),whose sensing elements are excitable cells,can monitor electrophysiological properties of cultured neuron networks with cellular signals well analyzed.Here we report a kind of neurochip with rat pheochromocytoma(PC12) cells hybrid with LAPS and a method of de-noising signals based on wavelet transform.Cells were cultured on LAPS for several days to form networks,and we then used LAPS system to detect the extracellular potentials with signals d...     

Congenital atresia of the left main coronary artery in an infant

Congenital atresia of the left main coronary artery is a rare occurrence, and surgical revascularizationbypass graft is required. We here report a rare case of congenital coronary anomaly in an infant. A 10-month-old male infant was admitted to the hospital with heart failure symptoms. Echocardiographic examinations revealed mitral valve regurgitation and ischemic changes of the anterolateral papillary muscle and chordae. Coronary angiography showed atresia of the left main coronary artery with a severe hypoplastic left anterior descending artery and a circumflex coronary artery. Unfortunately, sudden cardiac arrest occurred after catheterization and the infant did not recover despite of immediate cardiopulmonary resuscitation. Further studies are needed to find a newer diagnostic method to detect coronary anomaly in an infant, and coronary angiography, if necessary, has to be performed very carefully.     

Electromagnetic effects on the biological tissue surrounding a transcutaneous transformer for an artificial anal sphincter system

This paper reports on the electromagnetic effects on the biological tissue surrounding a transcutaneous transformer for an artificial anal sphincter. The coupling coils and human tissues, including the skin, fat, muscle, liver, and blood, were considered. Specific absorption rate (SAR) and current density were analyzed by a finite-length solenoid model. First, SAR and current density as a function of frequency (10–10⁷ Hz) for an emission current of 1.5 A were calculated under different tissue thickness. Then relations between SAR, current density, and five types of tissues under each frequency were deduced. As a result, both the SAR and current density were below the basic restrictions of the International Commission on Non-Ionizing Radiation Protection (ICNIRP). The results show that the analysis of these data is very important for developing the artificial anal sphincter system.     

Carbon steel slag as cementitious material for self-consolidating concrete

This study deals with the recycling of carbon steel slag （CSS） to produce self-consolidating concrete （SCC）. Since the chemical composition of CSS is similar to that of Portland cement or blast furnace slag （BFS）, it is expected to behave similarly. In the current study, the pozzolanic activity index of CSS is examined. Furthermore, the use of CSS as a pozzolanic material to partially replace Portland cement in the production of SCC is tested. We designed concrete mixtures with different water-to- cementitious material ratios （w/cm） keeping water and superplasticizer （SP） contents constant. Results showed that the design and performance of all the concrete mixtures used in this investigation were comparable to those of SCC and high performance con- crete （HPC）. However, compared to ordinary plain concrete （OPC）, the additional CSS content increases the setting time. In the CSS mixtures set for 90 d, compressive strengths of 86%, 134% and 121% were attained as compared to the control concrete; the corresponding w/cm ratios were 0.28, 0.32 and 0.40, respectively. Verifying the soundness of the SCC for meeting the criteria for HPC, the ultrasonic pulse velocity （UPV） of CSS was found to be comparable to that of ordinary concrete. In conclusion, the recycling of CSS can be advantageously employed in the production of SCC.