文化形态体育史观：关于体育发展历史进程的再思考     

刘子建 《成都体育学院学报》2014,(12)

长期以来,有关体育的各类文献汗牛充栋,然而,关于体育的基本定义、体育学涉及的核心问题、体育历史发展分期问题以及体育发展的一般规律问题并没有得到解决,导致我国体育事业发展缺少系统而科学的理论基础,体育政策摇摆,体育事业发展缓慢,体育产业落后。文章就体育理论研究中几个基本问题进行了分析,提出了新的观点。  相似文献   

开放大学之课堂文化形态论     

李作强  张亚斌 《安徽广播电视大学学报》2015,(1):52-56

课堂是大学教学的中心,课堂文化之于开放大学无疑具有符号表征作用。从校本文化课堂、媒介文化课堂、社会文化课堂三个方面阐述了开放大学课堂文化形态,得到了开放大学课堂文化是推动开放大学转化为远程学习者融入社会主流文化的预备学校等相关结论。  相似文献   

Acute effects of two different tennis sessions on dorsal and lumbar spine of adult players     

Maria Chiara Gallotta  Valerio Bonavolontà  Gian Pietro Emerenziani  Emanuele Franciosi  Alessandro Tito  Laura Guidetti 《Journal of sports sciences》2015,33(11):1173-1181

The aim of the study was to evaluate the dorsal and lumbar spine of expert and recreational tennis players before (pre) and after (post) two different training sessions. The sample consisted of 17 male tennis players, nine expert and eight recreational males (age 21.2 ± 1.6 years). We assessed the back surface by rasterstereography pre and post two different training sessions both lasting 1.5 h: a standard training and a specific over-shoulder shots training session, respectively. Lordotic and kyphotic angle, length, imbalance, inclination for trunk, pelvic torsion, left and right lateral deviation and surface rotation were measured. Tennis expertise (expert versus recreational) significantly affected the surface rotation and right lateral deviation (P < 0.05). Trunk length was affected by intervention (pre versus post) (P < 0.05). Left lateral deviation differed both for type of session (session 1 versus session 2) and intervention (P < 0.001, P < 0.05). Expert tennis players had higher values on surface rotation and right lateral deviation, around or just above physiological values (0–5° and 0–5 mm, respectively). Type of session significantly affected left lateral deviation, indicating that over-shoulder shots lead to a higher stress for the spine; the workload produced by both single sessions led to a shortening effect on trunk length. A single training session can induce acute modifications in some parameters of dorsal and lumbar spine of players.  相似文献   

不同浓度La掺杂ZnO薄膜光学特性的研究     

徐井华  刘成有 《通化师范学院学报》2010,31(4):24-25

用凝胶溶胶（sol—gel）法在普通截玻片和si上生长了稀土La掺杂ZnO薄膜,稀土La^3＋离子和Zn^2＋浓度摩尔比分别为1％,2％,3％．通过X射线衍射仪（XRD）、紫外可见分光光度计（UVS）、原子力显微镜（AFM）、光致发光（PL）等对薄膜的结构、光学特性、形貌进行表征,结果显示不同浓度La掺杂的ZnO薄膜均为六角纤锌矿结构,薄膜表面颗粒均匀平整,随着掺杂浓度的提高,La掺杂ZnO薄膜的紫外发光峰出现蓝移现象．  相似文献   

基于AID模型的知识城市发展之路     

代明  郑闽  王颖贤 《科技管理研究》2018,(21)

城市形态转换的主要表征是其核心功能——集散效应的演变。当代中心或高端城市的核心功能正由商品集散、工业集散、资本集散等转向“知识集散”。这便催生出“知识城市”形态。知识集散是一个知识集聚、创新与扩散的循环累积过程。这可通过AID模型加以刻画并运用样本城市数据予以实证。  相似文献   

Time course of the acute effects of core stabilisation exercise on seated postural control     

Jordan B. Lee 《Sports biomechanics / International Society of Biomechanics in Sports》2018,17(4):494-501

Core stabilisation exercises are often promoted for purposes ranging from general fitness to high-performance athletics, and the prevention and rehabilitation of back troubles. These exercises, when performed properly, may have the potential to enhance torso postural awareness and control, yet the potential for achieving immediate gains has not been completely studied. Fourteen healthy young participants performed a single bout of non-fatiguing core stabilisation exercise that consisted of repeated sets of 2 isometric exercises, the side bridge and the four-point contralateral arm-and-leg extension. Seated postural control, using an unstable balance platform on top of a force plate, was assessed before and after exercise, including multiple time points within a 20-minute follow-up period. Nine standard postural control variables were calculated at each time point, including sway displacement and velocity ranges, root mean squares and cumulative path length. Statistical analysis showed that none of the postural control variables were significantly different at any time point following completion of core stabilisation exercise. Thus, we conclude that a single bout of acute core stabilisation exercise is insufficient to immediately improve seated trunk postural control in young healthy individuals.  相似文献