湖南水稻插秧机械化推广模式及其发展对策

我国插秧机械化的现有模式有机械化插秧公司、供苗公司、机手自育秧苗并带秧带机为农户栽插三种.目前插秧机的推广普及还存在一定困难,需要国家和各级政府共同扶持,在湖南省推广及实现插秧机械化,应采取加强领导等一系列适合湖南省省情的对策,以促进其快速推广和普及.     

延伸实践教学课堂,构筑"两课"实践教学新模式

实践教学近年来成为高校“两课”改革的亮点。但实际操作中，实践被限制在比较狭窄的范围内，并有形式化的倾向。为此，必须在坚持传统实践教学课堂的基础上，积极开拓新的实践教学课堂，把“两课”实践教学课堂延伸到校园和社会，并把相应的考核办法延伸到新的课堂，从而形成“两课”实践教学的七个课堂，构筑全方位考核学生德育养成的“两课”实践教学新模式。     

中国商业电影的可贵探索--冯小刚与贺岁片

冯小刚对中国商业电影作了卓有成效的探索,特别是他的"贺岁片"对观众具有极大的感染力.本文从三个方面分析了冯小刚电影成功之处:1.对观众的定位考虑和欲望满足;2.精彩的对白;3.有中国特色的明星制.冯小刚的成功为中国的商业电影树立了榜样.     

古代文论“游”范畴阐说

“游”是艺术主体与客体在澄澈清明状态下心与物的紧密结合,是心灵的由静入动的审美体验活动。“游”作为艺术思维的状态,是指审美主体通过强烈的情感、想象和直觉等活动,进入心醉神迷、物我消融,即心与目、物与我相互触发而又相互融为一体的审美境界,从先秦时代开始,中国古代文论家就充分认识到“游”丰富的内涵并加以挖掘,“心游万仞”“神与物游”“梦往神游”等便是对“游”的文学审美本质的生动诠释。     

论散打的技击原理

采用文献资料法、专家调查法、访谈法,结合实践对散打技击原理进行研究,旨在使散打运动员在学习技术的同时,进行客观、理智的分析,真正理解各种技法的基本原理,并在训练及实践中不断发展完善自身的技法及理论体系。     

基于“3S”技术的森林火灾损失评估系统研究与实现

在综合国内外森林火灾研究现状的基础上,提出并实现了基于“3S”技术的森林火灾损失评估系统,将森林火灾损失评估分为灾中评估、灾后评估两大部分．前者改进并实现了基于3D元胞自动机的林火蔓延模型,后者提出了基于格网的损失评估模型,从直接经济损失、间接经济损失、社会损失3个方面反映灾情损失情况．     

The dimensional accuracy of preparation of femoral cavity in cementless total hip arthroplasty

Objective: To observe the accuracy of femoral preparation and the position of the cementless prosthesis in femoral cavity, and to compare the results between the computer-assisted surgical group (CASPAR) and the conventional group. Methods: Ten femoral components were implanted either manually or by CASPAR in cadaver femurs. The specimens were cut to 3 mm thick slices. Microradiograms of every slice were sent to a computer for analysis with special software (IDL). The gaps and the medullary cavities between component and bone, the direct bone contact area of the implant surface, the gap width and the percentage of gap and bone contact area were measured in every slice. Results: In the proximal implant coated with HA of the CASPAR group, the average percentage of bone contact reached 93.2% (ranging from 87.6% to 99.7%); the average gap percentage was 2.9% (ranging from 0.3% to 7.8%); the maximum gap width was 0.81 mm and the average gap width was only 0.20 mm. While in the conventional group, the average     

我国男子400m运动员专项运动素质探析

绝对速度、速度耐力和专项力量3个因素与400m跑运动水平直接相关,是影响400m竞技能力的主要素质。通过对国内外优秀男子400m运动员之间的比较,发现我国男子400m运动员在速度方面的绝对速度并不比国外运动员差,主要差距在速度耐力;在力量素质方面,主要是髋关节的力量差。     

Lower limb muscle activity during table tennis strokes

This study aimed to compare the muscle activity of lower limbs across typical table tennis strokes. Fourteen high-level players participated in this study in which five typical strokes (backhand top, forehand top, forehand spin, forehand smash, flick) were analysed. Surface electromyography activity (EMG) of eight muscles was recorded (gluteus maximus, biceps femoris, vastus medialis, vastus lateralis, rectus femoris, gastrocnemius medialis, gastrocnemius lateralis, soleus) and normalised to the maximal activity measured during squat jump or isometric maximal voluntary contractions. The forehand spin, the forehand top and the forehand smash exhibited significant higher EMG amplitude when compared with other strokes. Both biceps femoris and gluteus maximus were strongly activated during the smash, forehand spin and forehand top (from 62.8 to 91.7% of maximal EMG activity). Both vastii and rectus femoris were moderately to strongly activated during the forehand spin (from 50.4 to 62.2% of maximal EMG activity) whereas gastrocnemii and soleus exhibited the highest level of activity during the smash (from 67.1 to 92.1% of maximal EMG activity). Our study demonstrates that offensive strokes, such as smash or forehand top, exhibit higher levels of activity than other strokes.     

A biomechanical comparison in the lower limb and lumbar spine between a hit and drag flick in field hockey

Research has revealed that field hockey drag flickers have greater odds of hip and lumbar injuries compared to non-drag flickers (DF). This study aimed to compare the biomechanics of a field hockey hit and a specialised field hockey drag flick. Eighteen male and seven female specialised hockey DF performed a hit and a drag flick in a motion analysis laboratory with an 18-camera three-dimensional motion analysis system and a calibrated multichannel force platform to examine differences in lower limb and lumbar kinematics and kinetics. Results revealed that drag flicks were performed with more of a forward lunge on the left lower limb resulting in significantly greater left ankle dorsiflexion, knee, hip and lumbar flexion (Ps<0.001) compared to a hit. Drag flicks were also performed with significantly greater lateral flexion (P < 0.002) and rotation of the lumbar spine (P < 0.006) compared to a hit. Differences in kinematics lead to greater shear, compression and tensile forces in multiple left lower limb and lumbar joints in the drag flick compared to the hit (P < 0.05). The biomechanical differences in drag flicks compared to a hit may have ramifications with respect to injury in field hockey drag flickers.