建立波兰的市场经济     

Sachs  J 宋继珍 《科学中国》1992,(7):1-9

  相似文献   

安徽省体育市场发展与经营管理   总被引：5，自引：0，他引：5  

许广全  李燕  李永跃  赖恺仡  邵邦林  洪雷  左新荣 《体育学刊》2006,13(3):32-34

对安徽省体育市场发展中的体育用品业、竞赛表演业、体育旅游业等进行研究。结果认为,安徽省部分体育用品企业年产值较好,但实质上98%属来料加工,其产品真正以自主或安徽品牌出口的几乎没有;安徽省竞赛表演市场行政干预过多,市场管理相对薄弱;安徽省专业体育旅行社缺乏,体育旅游活动仅限于某一地方政府组织的工作计划或号召,缺乏社会商业力量的投入,多元化体育旅游形态难以形成。诸多问题在一定程度上制约着安徽省体育市场的发展。  相似文献   

不能生育的雌鸽     

J·P·史托斯高夫  刘正光 《环球赛鸽科技》2004,(6)

造成雌鸽不能生育的情况的原因一定是很多的,作者以自己养鸽生涯中的经验,历数种种可能,想必会对你有所启发。这是一个广义的概念,涉及从先天性不育到老年不育的各个方面,包括相对性不育,即雌鸽产蛋少、产蛋不正常(比如无壳蛋),也可能是个别雌鸽不育,出现雏鸽  相似文献   

陆生蓝藻地木耳中海藻糖研究初报   总被引：3，自引：0，他引：3  

李三相  李勃  左国防  杨亚军 《天水师范学院学报》2004,24(5):42-43

运用薄层层析法研究发现地木耳中含有海藻糖,不但提升了地木耳的应用价值,而且为海藻糖的开发提供新思路。  相似文献   

The distance-time relationship over a century of running Olympic performances: A limit on the critical speed concept     

Dekerle J  Nesi X  Carter H 《Journal of sports sciences》2006,24(11):1213-1221

We analyse the evolution of the slope (critical speed) and the y-intercept (anaerobic distance capacity) of the linear distance-time relationship over a century of Olympic running performances. The distance-time relationship of each Olympic Games (1920-2004) was plotted using the performances in the 800-, 1500- and 5000-m track events. Values for critical speed and anaerobic distance capacity were determined by linear modelling. Mean performances for the 800, 1500 and 5000 m were 104.9 +/- 1.5 s (1.4%), 217.2 +/- 2.8 s (1.3%) and 808.9 +/- 18.4 s (2.3%), respectively. Critical speed improved during the first three-quarters of the twentieth century to reach a plateau in 1984. This is in accordance with the literature (Peronnet & Thibault, 1989) and suggests that "human aerobic endurance" has improved within the century (+13.4%) and tends to stabilize. Anaerobic distance capacity was highly variable over the century (coefficient of variation = 9.4%) and did not show a linear improvement over the years as has previously been suggested (Peronnet & Thibault, 1989). This could be due to an artefact in the application of the two-parameter model to only three Olympic performances. A limitation to the use of this linear mathematical model to fit physiological data may have been demonstrated.  相似文献   

化学实验教学的元认知训练与学习适应性之关系研究     

左国防  李艳红 《天水师范学院学报》2004,24(5):77-78

在化学实验教学中对学生进行元认知训练研究表明,元认知训练对学生学习适应性的发展和元认知水平的提高有着极显著的作用。  相似文献   

影响图书馆未来的某些因素     

Martyn  J 陈昭楠 《国外情报科学》1992,10(2):36-39,35

  相似文献   

Perception of kinematic characteristics of tennis strokes for anticipating stroke type and direction     

Shim J  Les Carlton G  Kwon YH 《Research quarterly for exercise and sport》2006,77(3):326-339

The purpose of this study was to determine the sources of visual information used by highly skilled tennis players in anticipating their opponent's shots. In Experiment 1, motion analysis of the strokes showed that the relative motion between the racquet and forearm was different between the ground strokes and lobs, but there were no reliable kinematic differences when shot direction was varied. In Experiment 2, 12 skilled tennis players observed the opponent hitting strokes in a normal video or in a point-light display with different segments occluded. Players' anticipation accuracy was not degraded by the use of the point-light display. Occluding the racquet and forearm significantly reduced the participant's ability to determine the type of stroke produced.  相似文献   

手性树状化合物的配位性质研究     

左国防  莫尊理  杨武  高锦章 《天水师范学院学报》2001,21(5):22-24

通过使用荧光光谱法,研究了新合成的化合物2,6-吡啶二甲酰(氨基酸)胺与部分过渡金属离子及稀土离子的配位性质.发现在pH=2.0-12.0以及溴化十六烷基吡啶存在下,该化合物可以和铜离子形成稳定的配合物,其最大激发和发射波长分别位于310nm和420nm,组成比为21(铜离子配体).当铜离子的浓度介于1.1μg/ml-32.0μg,/ml范围时,配合物荧光强度与铜离子浓度呈良好的线性关系,线性方程为F=0.44757+3.98388Ccu2+(10-3mol/L).通过新化合物与铜离子的配位反应,初步考察了新试剂的配位特征.  相似文献   

幼鸽日益消瘦的问题     

J·P·杜夏尔  刘正光 《环球赛鸽科技》2006,(1)

每年春季,比利时各地的鸽友都在抱怨一种疾病,一般称其为鸽腺病毒病。这究竟是种什么疾病呢?有些科研人员把这种疾病规为圆环病毒 (circovirus),一种极少有人知道的病毒。为了使问题更明确一些,我们把这问题转告了吉恩·皮埃尔·杜夏尔(Jean Pierre Duchatel),他在列日大学兽医系工作。需告诉大家的是,吉恩·皮埃尔·杜夏尔先生也是位鸽友,而且自1974年以来就是鸟类医学系的成员,一直与文德夫格教授(Vindevogel)共事。他们一起深入研究感染鸽子的各类病毒,并为Fort Dodge公司研制了多种疫苗,如 Colombovac PMV(副粘病毒疫苗),Colombovac Pox (鸽痘病毒)和Colombovac Paratyphus (副伤寒病毒)。目前,杜夏尔先生正负责一项由FCI(国际赛鸽联合总会)出资扶植的研究项目,研究可传染给信鸽的圆环病毒。  相似文献