青少年中长跑训练措施及对策研究     

蒋雯  廖文豪 《成都教育学院学报》2007,21(12):85-87

青少年运动员中长跑应以"短"促"长","短""长"相结合,这是青少年中长跑训练的突出特点.只注重跑量与注重持续跑的距离训练方法,既不符合青少年的生长发育规律,也违背现代中长跑的训练理论.应该清楚地认识到:现代中长跑比赛实践中无氧功能的比例越来越大,激烈的比赛实践对运动员的速度能力要求越来越高.文章结合教学训练中的实际情况,分析了青少年的训练特点,并对其训练的方法手段及措施进行了探讨.  相似文献   

Stimulated Growth of Aerobic Microbes Using Calcium Peroxide     

刘涉江  姜斌  李鑫钢 《天津大学学报(英文版)》2006,12(6):399-403

The dissolved oxygen (DO) level in groundwateris a key parameter forin situbioremediation of con-taminated groundwater. However, due to the poorcontent of DO in groundwater, aerobic microbial deg-radation is difficult to occur in natural condition. Ear-ly work on enhancedin situbioremediation deliveredoxygen to the contaminated aquiferbyspargingairin awell, but the low solubility of oxygen increased thedifficulty and expense of maintaining aerobic condi-tions in groundwater[1]. This problem …  相似文献   

拉瓦锡与近代化学革命   总被引：1，自引：0，他引：1  

余天桃  刘玉玲 《临沂师范学院学报》2001,23(6):141-144

分析了18世纪化学革命产生的背景，阐述了燃烧氧化学说的伟大意义及其在化学发展史上的地位，并探讨了拉瓦锡的科学思想和研究方法。  相似文献   

氯化亚汞声光器件换能器五层结构设计   总被引：2，自引：1，他引：2  

谢本亮 《赣南师范学院学报》2001,(3):21-24

提出用环氧树脂聚合物作为缓冲层 ,设计氯化亚汞声光器件的换能器。从器件的布喇格带宽出发 ,设计了五层结构的换能器 ,计算了以Ag为电极 ,ln或pb粘接层时 ,其五层的各自厚度 ,并确保了换能器倍频程带宽  相似文献   

CoCl_2掺杂聚苯胺修饰电极测定水中的溶解氧   总被引：2，自引：0，他引：2  

钟平  钟陵  黄桂萍 《赣南师范学院学报》2003,(3):59-61

制备了可溶性聚苯胺掺杂CoCl2修饰玻碳电极,并用循环伏安法测定水中的溶解氧.研究表明:阴极峰电流ipc与水中的溶解氧浓度具有良好的线性关系.将测定结果与碘量法相比较,误差<±3%.另外该法操作简便、快速,所用电极性能稳定,为化学修饰电极用于分析水中溶解氧提供了一种新的途径.  相似文献   

Effects of zinc on cadmium uptake by spring wheat （Triticum aestivum, L.）： long-time hydroponic study and short-time ^109Cd tracing study   总被引：2，自引：0，他引：2  

赵中秋朱永官  蔡运龙 《浙江大学学报(A卷英文版)》2005,6(7):643-648

To investigate effects of Zn on Cd uptake by spring wheat (Triticum aestivum, L.) in solution culture, long-time hydroponic experiment (1 month) (Experiment 1) and short-time Cd isotope (109Cd) tracing experiment (24 h) (Experiment 2) were conducted. In Experiment 1, spring wheat (cv. Brookton) was grown in nutrient solution at uniform cadmium concentration of 20μ mol/L and 10 zinc concentrations (0, 1, 5, 10, 20, 100, 200, 500, 1000, 2000 μ mol/L). In Experiment 2, spring wheat seedlings,pre-cultivated in complete nutrient solution, were treated with 109Cd of uniform activity and the same series of Zn concentrations as those in Experiment 1 for 24 h. Cd concentrations in shoots and roots in Experiment 1 increased marginally but not consistently with Zn increasing at Zn rates of 1～200 μmol/L, and then decreased significantly at high rates (＞200 μ mol/L). In Experiment 2, the response of 109Cd activities in shoots and roots to increasing Zn was greatly similar to the response of Cd concentrations to Zn increasing in Experiment 1. The results of the two experiments indicated that the short-time and long-time exposure of spring wheat to Zn had similar effects on Cd accumulation.  相似文献   

池塘水中溶解氧变化规律的分析     

崔峰 《安徽科技学院学报》1999,(3)

池塘水中的溶解氧在白天随着太阳的升起而逐渐上升,至下午达到最高值,此后溶氧量逐渐下降至第二天早晨黎明时达最低值。  相似文献   

论骨骼肌内葡萄糖的转运     

罗鹰翔  陈勇 《湖北体育科技》1999,(1)

骨骼肌是葡萄糖最主要的利用者,同时也是碳水化合物的主要贮藏部位（占糖原总量的70％）。本文介绍了在运动过程中骨骼肌对葡萄糖利用及骨骼肌对葡萄糖利用的潜在机理。  相似文献   

登楼梯能量消耗的测量与统计方法研究     

王欢  郑迎东  张彦峰  江崇民 《中国体育科技》2010,46(2)

目的:了解登楼梯能量消耗状况以及探讨能耗测量和计算方法.方法:30名受试者登12层楼(每级台阶高度16 cm,共204级台阶,垂直距离32.6 m),每位受试者以90步/min和100步/min的步频上下两次楼梯.在登楼梯过程中,通过便携式肺功能仪(德国CORTEX MgtaMax 3B)测量受试者的摄氧量、通气量、能耗、心率、呼吸商、氧脉搏等指标.结果:上下楼梯的能量消耗比是2.7;1;在一定步频范围内,随着步频的提高,能耗相应增加,两者呈线性关系.以90～100步/min上下楼梯可以代表日常登楼速度;以90～100步/min登12层楼的运动时间不到3 min,多数受试者的能耗、心率等生理指标经过快速上升期后进入稳定状态;登楼梯的能耗值有明显的年龄和性别差异,20岁组男性显著高于50岁组男性和20岁组女性;利用多项式回归建立的登楼梯能耗预测方程,能够准确反映日常爬不同楼层的能量消耗值.  相似文献   

Protective Role of <Emphasis Type="SmallCaps">l</Emphasis>-Arginine Against Free-Radical Mediated Oxidative Damage in Patients with Unstable Angina     

Tripathi P  Chandra M  Misra MK 《Indian journal of clinical biochemistry : IJCB》2010,25(3):302-306

Unstable angina is a critical condition of heart resulting from narrowing of vessels supplying blood to heart. Ischemia of the myocardium leads to oxidative stress and severe tissue damage. The objective of the present study was to determine the effect of l-arginine administration on the oxidant–antioxidant homeostasis which otherwise gets imbalanced in patients with cardiovascular diseases. The results obtained, show improvement in the oxidant–antioxidant levels of the subjects upon incorporation of l-arginine. Our findings suggest that supplementation of l-arginine along with regular anti-anginal therapy may be beneficial to the patients of unstable angina.  相似文献