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1.
为响应国家的节能减排号召,构建节约型社会,本文设计一种给定一重力势能,根据能量转换原理,可将该重力势能转换为机械能并可用来驱动小车行走的装置.小车行走时能沿着既定的路线并自动避开预先设置的障碍物.本文通过建立小车数学模型,利用Matlab软件分析各参数对小车行走的影响及绘制小车行走轨迹,实现优化设计,并最终指导零件尺寸的精确设计.  相似文献   

2.
本文设计了一种基于HSI模型的智能循迹车,基于S3C6410控制器,以CMOS摄像头作为路径识别装置,通过图像特征实时提取路径信息,在HSI模型下结合饱和度S分量对色调H分量进行OTSU自适应阀值算法处理,实现任意路径识别与智能跟踪。实验证明,智能车能按照任意给定的彩色引导线高速稳定地行驶,实现了小车循迹跟踪运动,达到了较好的实时性、高效性和智能性。  相似文献   

3.
《锁相技术》是通信工程专业的一门理论性和实践性都很强的重要专业课程。学生经常抱怨锁相环的理论知识过于复杂,应用电路设计时也几乎无从下手。在数年《锁相技术》的实际教学过程中,经过努力摸索,总结出改善教学效果的几点措施,即课前---认真写好教案、课堂---科学发挥多媒体教学的优势、课余---通过实训提高动手能力等。  相似文献   

4.
刘琦 《电子竞技》2008,(24):71-71
无意中接触到MOD,从认识到热爱,发现它带给我们很多新鲜的事物并扩展我们的思路和知识,于是和兄弟组建团队以《谛造堂》命名,它的含义:谛---仔细、妙想;造---改造;堂---兄弟组合形式。到现在最终完成我们的第一个作品,中间遇到很多困难,不过乐趣尽在其中,这也是最为吸引我们的地对。多留意生活和身边的事物,享受过程中的艰辛与困难并解决掉它,从中累积MOD改造经验。《谛造堂》将继续努力为大家呈现更优秀的作品!  相似文献   

5.
企业是社会的基本单位,社会也在影响着企业。发展企业文化,则可以促进社会细胞---企业的和谐发展,为建立和谐社会奠定基础,推进社会主义社会又好又快发展。  相似文献   

6.
本文浅述城市“热岛效应”解决之策---屋顶、墙面绿化的作用。  相似文献   

7.
本项目在实验室里合成了高温铜氧化物超导体YBCO,并以此为基础,制备出在液氮下运行的超导磁悬浮小车模型.通过特殊排布的永磁体轨道约束,超导磁悬浮小车可以很好的在轨道上实现无接触摩擦运行.最后,我们利用磁阻尼原理设计制备了一套动力系统,实现了超导磁悬浮小车的自动启动和制动.  相似文献   

8.
本文以翻译生态学的研究视角,分析了生态化翻译的过程模式,以公示语的翻译为例,阐述了生态化翻译的基本原则---多维度适应与适应性选择,以提高翻译生态学在具体翻译实践中的可操作性。  相似文献   

9.
采用文献资料法、数理统计法、逻辑分析法等对我校学生近几年《国家体质健康标准测试》成绩及部分08级学生的课外锻炼情况进行调查对比分析,得出学生的体质在逐年下降,课外锻炼的情况也不容乐观的结论。针对我校的这一情况,给出体育课程教学与学生课外体育锻炼互动的对策,使体育教学---课外锻炼---竞赛训练三者相互渗透,相辅相成,相互促进,协调发展。  相似文献   

10.
本文论述带式输送机卸料小车悬索、滑触线、滚筒电缆等现有供电问题,作了一些调研,总结优缺点,提出塑钢滑轨供电新方法。对塑轨运行阻力、滑轮组确定、电缆压缩范围和走廊予留长度等主要问题作了分析计算,为带式输送机卸料小车室内长距离供电寻求新的方法。  相似文献   

11.
This study examined the effect of carbohydrate ingestion on metabolic and performance-related responses during and after a simulated 1h cycling time trial. Eight trained male cyclists (VO 2 peak = 66.5ml kg -1 min -1 ) rode their own bicycles mounted on a windload simulator to imitate real riding conditions. At a self-selected maximal pace, the cyclists performed two 1h rides (separated by 7 days) and were fed either an 8% carbohydrate or placebo solution. The beverages were administered 25 min before (4.5ml kg -1 ) and at the end (4.5ml kg -1 ) of the ride. With carbohydrate feeding, plasma glucose tended (P = 0.21) to rise before the time trial. Compared with rest, the plasma glucose concentration decreased significantly (P < 0.05) at the end of both rides, with no statistically significant difference being observed between treatments. Thereafter, plasma glucose increased significantly (P < 0.05) at 15 and 30 min into recovery, and was significantly higher at 30 min during the carbohydrate trial compared with the placebo trial. No significant changes in plasma free fatty acids were observed during the ride. However, a significant increase (P < 0.05) in free fatty acids was found at 15 and 30 min into recovery, with no difference between trials. Mean power output was significantly (P < 0.05) greater during the carbohydrate compared with the placebo trial (mean - S.E.: 277-3 and 269-3W, respectively). The greater distance covered in the carbohydrate compared with the placebo trial (41.5-1.06 and 41.0–1.06km, respectively; P < 0.05) was equivalent to a 44s improvement. We conclude that pre-exercise carbohydrate ingestion significantly increases endurance performance in trained cyclists during a 1h simulated time trial. Although the mechanism for this enhancement in performance with carbohydrate ingestion cannot be surmised from the present results, it could be related to a higher rate of carbohydrate oxidation, or to favourable effects of carbohydrate ingestion on the central component of fatigue.  相似文献   

12.
The biology and medicine of rowing are briefly reviewed. Effort in a 2000 -m race is about 70% aerobic. Because the boat (and in some instances a cox) must be propelled, successful competitors are very tall, with a large lean mass and aerobic power. Large hearts may lead to erroneous diagnoses of a cardiomyopathy. Large respiratory minute volumes must be developed by chest muscles that are also involved in rowing. The vital capacity is typically large, and breathing becomes entrained. Expiration cannot be slowed relative to inspiration (as normally occurs at high rates of ventilation) and the limiting flow velocity may be reached, with the potential for airway collapse. Performance is strongly related to the power output at the ‘anaerobic threshold’, and lactate measures provide a guide to an appropriate intensity of endurance training. Peak blood lactate levels are higher in males (commonly 11–19 mmol·l -1 and occasionally as high as 25 mmol·l -1) than in females (9–11 mmol·l -1), probably because males have a greater muscle mass in relation to blood volume. The skeletal muscles are predominantly slow twitch in type, developing an unusual force and power at low contraction velocities. Many rowers have a suboptimal diet, eating excessive amounts of fat. Lightweight rowers also have problems of weight cycling. Aerobic power and muscle endurance often change by 10% over the season, but such fluctuations can be largely avoided by a well-designed winter training programme. Injuries include back and knee problems, tenosynovitis of the wrist and, since the introduction of large blades, fractures of the costae.  相似文献   

13.
我国体育市场管理法规研究   总被引:12,自引:0,他引:12  
采用调查法和比较法对全国体育市场立法和管理现状进行调查,对部分较早出台并有一定代表性的省市的体育市场管理法规的立法和管理情况进行了研究,提出了体育市场管理立法和管理的原则、基本程序、措施及其一般模式,为规范全国体育市场管理提供参考依据。  相似文献   

14.
重新认识体育的社会关联   总被引:3,自引:1,他引:2  
体育与政治之间存在一个悖论,体育的发展与经济实力之间没有直线相关,体育与教育部分重叠,体育与宗教最为近缘,体育可借用科学手段,体育的艺术禀性日益明显,体育与养生反映着两种人生观。  相似文献   

15.
本文在专家访谈、问卷调查、数理统计和文献资料分析的基础上,探析了上海社区体育竞赛参与者的特点、参与者对社区体育赛事运作管理的看法等问题。在此基础上从引进社区体育赛事的志愿者、整合社区体育赛事的各种资源、开发社区体育竞赛的无形资产、组建非营利性的专业团队、规范社区体育赛事的服务管理等方面提出了进一步满足上海社区居民日益增长的体育竞赛参赛需求的对策与措施。  相似文献   

16.
对全面把握游泳训练环节的探讨   总被引:4,自引:0,他引:4  
从系统观点出发,结合训练实践,对全面把握游泳训练环节进行探讨。认为应强化非智力因素在运动员多年训练中的作用,在育材全过程中不断选材,从整体上把握动态训练的全过程,把培养高水平运动员的整个过程置于一个严格的科学控制之下。  相似文献   

17.
我国优秀游泳运动员出发技术辅助训练的研究   总被引:3,自引:0,他引:3  
林洪  于仙贵  程燕 《体育科学》1998,18(4):53-56
为改进我国优秀游泳运动员的出发技术,采用观测和实验方法,通过拍摄运动员陆上和水下出发技术录像以及出发计时,对出发技术进行运动生物力学诊断和分析。在此基础上,根据运动员自身特点和不同泳姿提出相应的入水启动方式,并研制出发训练辅助器材,对出发预备姿势、腾起角度以及飞行远度和入水角进行控制。实践证明:这是一种快捷、有效的出发技术辅助训练方法。  相似文献   

18.
影响和限制耐力性运动项目的成绩的生理因素是复杂的和多方面的,取决于训练的强度和运动成绩.大强度持续性运动可导致呼吸肌疲劳.运动性呼吸疲劳可能在决定运动耐量方面起到关键的作用:一方面通过直接影响运动肌力量的生成(外周疲劳),另一方面,通过肢体用力自感不安反馈引起工作肌运动单位输出功率下降(中枢疲劳).对呼吸肌进行训练,可能有助于提高耐力性项目的运动成绩.  相似文献   

19.
青少年业余足球运动员运动倾向性5因素结构模型初探   总被引:3,自引:0,他引:3  
根据Scanlan等人最新提出的运动倾向性理论模型,结合我国实际情况建立了青少年足球运动员运动倾向性5因素结构模型。运动倾向性被定义为:渴望和决心继续参加足球运动的心理状态。所建立的5因素结构模型认为,运动倾向性是由运动乐趣、参与选择、个人投入、社会约束及参与机会5个因素决定。经确定5个决定因素和运动倾向性的操作定义,编制了相应调查问卷,通过对北京市252名青少年足球运动员实测结果,建立运动倾向性及其影响因素的协方差结构模型,用Lisre 18分析的结果表明:该运动倾向性模型比较符合北京青少年足球运动员。其中运动乐趣、个人投入、参与机会和参与选择4因素对运动倾向性有影响;社会约束对运动倾向性影响不大。  相似文献   

20.
The aim of this study was to assess the sensitivity of the lactate minimum speed test to changes in endurance fitness resulting from a 6 week training intervention. Sixteen participants (mean +/- s :age 23 +/- 4 years;body mass 69.7 +/- 9.1 kg) completed 6 weeks of endurance training. Another eight participants (age 23 +/- 4 years; body mass 72.7 +/-12.5 kg) acted as non-training controls. Before and after the training intervention, all participants completed: (1) a standard multi-stage treadmill test for the assessment of VO 2max , running speed at the lactate threshold and running speed at a reference blood lactate concentration of 3 mmol.l -1 ; and (2) the lactate minimum speed test, which involved two supramaximal exercise bouts and an 8 min walking recovery period to increase blood lactate concentration before the completion of an incremental treadmill test. Additionally, a subgroup of eight participants from the training intervention completed a series of constant-speed runs for determination of running speed at the maximal lactate steady state. The test protocols were identical before and after the 6 week intervention. The control group showed no significant changes in VO 2max , running speed at the lactate threshold, running speed at a blood lactate concentration of 3 mmol.l -1 or the lactate minimum speed.In the training group, there was a significant increase in VO 2max (from 47.9 +/- 8.4 to 52.2 +/- 2.7 ml.kg -1 .min -1 ), running speed at the maximal lactate steady state (from 13.3 +/- 1.7 to 13.9 +/- 1.6 km.h -1 ), running speed at the lactate threshold (from 11.2 +/- 1.8 to 11.9 +/- 1.8 km.h -1 ) and running speed at a blood lactate concentration of 3 mmol.l -1 (from 12.5 +/- 2.2 to 13.2 +/- 2.1 km.h -1 ) (all P ? 0.05). Despite these clear improvements in aerobic fitness, there was no significant difference in lactate minimum speed after the training intervention (from 11.0 +/- 0.7 to 10.9 +/- 1.7 km.h -1 ). The results demonstrate that the lactate minimum speed,when assessed using the same exercise protocol before and after 6 weeks of aerobic exercise training, is not sensitive to changes in endurance capacity.  相似文献   

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