探研极大平坦维数

文中在极大平坦维数的定义基础上,研究了极大平坦维数的性质,并且以极大平坦维数为工具来刻画半遗传环、遗传环和正则环.     

补服乳清蛋白对人体最大吸氧量的影响

目的:研究补服不同量的乳清蛋白对人体最大吸氧量的变化,探讨补服乳清蛋白对人体有氧运动能力的影响。方法:采用单盲实验法,体育系12名健康男性大学生作为被试,每次(共3次)补服不同的补剂,然后在无氧功率自行车上进行3个连续三分钟的递增负荷运动,作自身对照。结果:补服7g和14g乳清蛋白与安慰剂相比最大吸氧量水平都有不同程度的变化,补服7g乳清蛋白与安慰剂相比差异性显著,p<0.05,补服14g乳清蛋白与安慰剂相比差异性非常显著p<0.01。结论:(1)补服不同量的乳清蛋白都不同程度影响人体的最大吸氧量水平;(2)说明乳清蛋白的补服对人体有氧运动能力有一定影响。     

最大吸氧量是有氧耐力最好指标的概念面临着挑战

长期以来，最大吸氧量被看作是评定耐力运动成绩的最好指标。但Hill没有证明作为最大吸氧量特征的吸氧量稳态。吸氧量稳态也没有得到后来研究者的证明。耐力运动的成绩不仅受肺系统摄取O2和心血管系统运输O2的限制，而且还受活动肌本身的一些因素的限制。最近一些研究还表明，最大吸氧量与耐力运动成绩无明显关系，而跑台跑的峰速度和无氧阈与耐力运动成绩密切相关，并可作估测耐力运动成绩的指标。     

对最大摄氧量判断标准的探讨

最大摄氧量（VO2max）是运动生理学反映机体心肺功能水平的一个重要指标。本文根据以前的文献资料,就VO2max的判断标准及其影响因素进行探讨。     

一种数据采集及显示电路的设计

介绍一种利用MAX144芯片做为A／D转换器，MAX7219芯片做为LED显示控制器，对模拟信号进行数据采集及显示的电路设计，并给出一个基本电路和两个相应的子程序。     

k阶Lyness max方程的若干积分

通过变量变换将k阶Lyness方程超离散化,得到k阶Lyness max方程,并给出了该方程的第一、第二和第三积分.     

浅谈3ds max室内外动漫设计的教学

3ds max是目前最优秀、使用最广泛的三维动画制作软件之一,它已经成为高职院校计算机及园林设计等专业的一门必修课,针对3dsmax命令繁多、功能强大的特点,如何系统全面地讲授这门课程,需要教师首先明确教什么,如何教的问题才能真正使学生学好、用好这一软件.     

浙江男足运动员最大摄氧量和恢复期乳酸代谢特征研究

以杭州绿城足球俱乐部中超队18名运动员为测试对象,通过测试递增负荷过程中运动员的最大摄氧量及恢复期血乳酸分析男子足球运动员有氧代谢特点,结果显示：浙江男足运动员和中国国家男足运动员在VO2max（L/min）方面有显著性差异,在相对VO2max（ml/kg/min）方面有高度显著性差异,而在VE、HR方面没有显著性差异。说明浙江男子足球运动员有氧能力低于国内优秀足球运动员（中国国家男子足球队）。     

Synergistic interaction of NaCl and Cd on growth and photosynthetic parameters in soybean genotypes differing in salinity tolerance

The effects of salinity(50 mmol/L NaCl) and Cd(1 μmol/L CdCl2) as sole and combined on growth and photosyn-thetic parameters were studied using two soybean genotypes,Huachun 18 and NGB.The concentrations of Cd2 ,Zn2 ,Ca2 ,Mg2 ,K and Na were also determined in seeds and pods.Huachun 18 suffered a more serious decrease than NGB in net photosynthetic rate(Pn) in the treatments of salinity stress alone and combined stress(NaCl Cd),showing that it is relatively sensitive to salinity.The decrease in Pn caused by salt stress in Huachun 18 was mainly due to the reduced total chlorophyll content and photosynthetic efficiency(the ratio of variable fluorescence to maximal fluorescence,Fv/Fm),whereas the decease in NGB was mainly related to reduced stomatal conductance(Gs).The combined stress of both Na and Cd did not induce further decrease in photosynthesis and fluorescence in the two genotypes relative to salt or Cd stress alone.Greater change in the pod concentrations of Zn2 ,Ca2 ,Mg2 ,K and Na was detected under salt stress for Huachun 18 than for NGB.The results suggested that the interactive effect of NaCl-Cd on growth and nutrient uptake differs between the two soybean genotypes.     

Reliability of metrics associated with a counter-movement jump performed on a force plate

The counter-movement jump is a consequence of maximal force, rate of force developed, and neuromuscular coordination. Thus, the counter-movement jump has been used to monitor various training adaptations. However, the smallest detectable difference of counter-movement jump metrics has yet to be established. The objective of the present study was to measure the reliability of counter-movement jump metrics, including rate of force development, flight time, time to max force, and max force. Twenty-nine male participants (mean age 25 ± 3 years) were divided into three groups. Each participant performed five counter-movement jumps on a force plate, on three consecutive days. Flight time detected trivial changes, (effect size < .2) and typical error of measurement of .25%; max force detected small changes (effect size < .5) with a typical error of measurement of .3%; rate of force development detected small to medium change (effect size .5–.8) with a typical error of measurement of .3%.