正手拉弧圈球技术是乒乓球运动员必须掌握的一项关键技术,也是最具杀伤力的进攻技术之一.本文对正手拉下旋高吊弧圈球技术动作的踝关节、膝关节、髋关节的动作角度和速度进行运动力学分析,为不同水平乒乓球运动员进行分层教学提供实践指导依据.采用Qualisys三维运动分析系统采集专业与非专业运动员正手拉下旋高吊弧圈球技术动作的运动力学数据,对两组人群下肢动作的关节角度、速度进行运动学对比分析.相关数据采用SPSS22.0统计分析软件进行独立样本t检验.结果表明:(1)专业运动员:①下肢运动模式按照用力方向和髋—膝—踝对位对线模式的协调发力.②身体重心位移从整体上来看呈现出从后下方往前上方的运行轨迹.(2)非专业运动员:①下肢运动模式是按照以左脚为支撑的右脚转动发力模式,且缺乏引拍的重心转换.②身体重心位移从整体上来看呈现出从下往上的运行轨迹.专业与非专业运动员下肢运动学的比较主要是协调运动模式的差异,在基本动作阶段的掌握无显著差异.

高校体育课程对学生的自主学习能力有着较高的要求，体育教学只有通过个性化、多元化的教学手段，才能切实激发学生的学习热情，提高其学习成绩。本文以高校常见的选项课乒乓球课程为例，通过学生自主学习的实验探索，证实了自主学习式教学法有助于改善学生的实战能力效果，提高其综合成绩，值得在高校选项课中予以借鉴和应用。

The aroma components in flavouring essence were tested and the potential harm was summarized.The relative standards at home and abroad are compared.Some suggestions on safety supervision were proposed in order to provide reference for the production management of flavouring essence.

As one of the acidic preservative,the abuse of benzoic acid and sodium benzoate is very dangerous.Because the residue of benzoic acid and sodium benzoate would do great harm to the human health even cause cancer after they were taken through the food and medicament.The researchers have dedicated many efforts to research for residue determination of benzoic acid and Sodium Benzoate.The security and methods for benzoic acid and sodium benzoate detection were summarized,this study was useful for the detecting technology of benzoic acid and sodium benzoate residues.

To the realize correctly and resolve the issue of the nitrite residue,the origin,harmfulness and determination methods of nitrite in foods were reviewed in this paper.

Taking foreign sportsmen and women in the 2008 Beijing Olympic Games tennis competition as research subjects,through literature and statistics to explore difference between China and foreign tennis players in terms of age,weight,height and Quetelet index.The results showed:in height,weight and Quetelet index,the Chinese athletes as a whole are less than that of the foreign elite athletes.In particular,there exists significant differences in the height index between Chinese best tennis players and foreign tennis players.

With the documentary analysis and statistic.For the 2008 Beijing Olympic Games women's tennis tournament of the top athletes at home and abroad statistics and statistical analysis.Base on Chinese women's tennis at the current competitive level of project development status.As the entry point for the match results,technical and tactical analysis,and competitive level,the development trend from the 2008 Beijing Olympic Games best women in the world.Recognizing gaps that China's overall women's tennis competitive level with the international advanced level.No matter what training system,Technical and tactical level,back-up personnel training system,management and drilling of innovation.Constraining the development of China's competitive tennis.As a basis for china's competitive tennis development trend and corresponding countermeasures of the development in the future.

Double resistance soybean variety BX10 tolerance to aluminum toxicity with high-effect phosphorus and double-susceptible soybean variety BD2 were used as experimental materials,and the changes of water and osmotic regu-lating matters in soybean were studied under phosphorus deficiency and aluminum toxicity by hydroponic culture.The re-sults indicated that water potential in leaf of two soybean varieties was obviously decreased under phosphorus deficiency and aluminum toxicity,and the decreased level for BD2 and aluminum toxicity treatment was the highest.Moreover,the contents of soluble sugar and proline in root and leaf of two varieties were increased by two treatments,and the increased effects of BX10 and aluminum toxicity were obvious.Therefore,soluble sugar in leaf may be the main osmotic regulating matter at the early stage of stress,and proline maybe play a leading role at the later stage,they played a synergistic effect to improve the plant tolerance to stress.

To prevent tennis sports injuries of wrinkly effectively,with literature survey,interviews and investigations,the paper analyses the cause of wrinkly physical injury on the base of their bodies characteristics and tennis technology action.The main reasons for sports injury are the organ decline,lack of preparatory activities and incorrect technical movement.Then it presents the effective ways of preventing injuries on exercise time,sports outfits,The main body place needed to be protected,amount of exercise and exercise intensity.

Objective To determine the total arsenic(As) in foods.Method The samples were digested by microwave,and analyzed by Zeeman graphite furnace atomic absorption spectrometry.The influences of program of microwave digestion and the conditions of spectrum were discussed.Results The samples were digested for 30 minutes at the highest temperature of 180 ℃,and palladium nitrate was used as matrix modifier,while ashing temperature and atomization temperature were 1?100 ℃ and 2?600 ℃,respectively.The linear range of As was 0～0.100 μg/L and correlation coefficient was 0.999?2.The detection limit was 0.52 μg,and the recovery ranged from 85% to 95%.Conclusion The method may be accurate,fast and economic.

According to the on-the-spot statistics of the serves in the tennis games of the Fujian 13th Sports Meeting,it is found that there commonly exists the weak serve aggression in the junior players,and that the poor-quality second serve usually follows the fault first serve.Therefore,the junior tennis players are supposed to keep the following in mind: throwing is the basis,spinning is the key and stability is the guarantee.

Abnormal performance is common in almost all sports events,especially in tennis matches which involves one-to-one competition.Through an investigation among 32 top athletes both male and female who attended the national tennis of U14 of 2006 NIKE.Wallenda psychology was found to be the major factor influencing athletes' performance.The paper analyzes Wallenda psychology,its causes and ways to overcome it,and puts forward concrete training methods,with an attempt to be helpful to athletes' training and their performance.

The reform and the development of university's sports and health education are the strong concern of physical educators. And it is of necessity and realistic significance to combine health sports theory with the objective, direction and practice of physical education reform. The cultivation and the formation of health consciousness is the primary task of health sports education. University's physical education should aim to strengthen students' physique constantly, improve their health and their study health sports knowledge and methods, cultivate students' lifelong sports consciousness, enhance their sports ability promote their all - round development both physical and mental.

Through the investigation on the status quo of the tennis development at colleges and universities in Fujian province, it is found that both teachers and students love tennis and many of them are eager to engage in it. However, the Jack of tennis courts and tennis teachers has become the main obstacle to its popularization. The paper also puts forth corresponding measures and suggestions for its development at colleges and universities.

在网球技术不断提高和发展的新形势下,网球裁判员基本功,尤其是一人制的裁判技巧,对提高裁判员业务技术水平,适应新形势下的工作需要,都有一定的意义.通过对裁判员的赛前准备、临场执法、赛后总结的论述,供网球裁判爱好者及体育界教师、学生们参考.

在调查研究的基础上提出厦门市竞技体育发展人才为本、科技兴体和金牌发展的战略思想和措施,供决策者参考.

运用问卷调查和文献资料等方法,对厦门市城市居住区体育设施配套建设现状进行了调查,分析了相关法规情况及其实效性,找出厦门市城市居住区体育设施配套建设现行法规的缺陷,以及执行过程中存在的问题,并提出相应的对策与建议,供立法机关在创制、修改、宣传法规和执法监督时参考.

This paper presents the related suggestion on the type of playing technique and method of table tennis for children and early youth, based on the means of investigations and further analysis as well as visiting certain trainers in Fujian province.

This paper studies the historical development of the modern table-tennis sport' s techniques based on the information from the interviews and literature. We found that the World Table - tennis Union has continually reforming the competition regulations as to adapt the development of Table-tennis sport since the first World Table-tennis Championships held in the December of 1926. Especially, the three major reforms adopted by the 47th World Table - tennis Championships held in 2003 provide the new opportunities to table-tennis sport and challenges the predominant status of China' s table-tennis sport at the same time. This paper tries to discuss and analyses the technique reforms caused by the new regulations and new competition system, and makes some constructive suggestions to China' s table-tennis sport.

通过对体育教育专业乒乓球普修课进行观察统计,发现学生在学习乒乓球直拍正手近台攻球时,出现的错误动作较多,影响了技术动作的形成与基本技术的提高.为预防和纠正错误动作的产生和发展,本文提出了以手指调节为重点,以拍形和挥臂为关键的教学基本方法.