对重剑刺手前置技术的分析

根据2002年和2003年全国击剑冠军赛重剑比赛的临场观察、技术统计以及相关资料的分析，阐述了重剑刺手前置技术的重要性。     

谈排球比赛的供能特点及提高供能能力的训练

谈排球比赛的供能特点及提高供能能力的训练刘宝仁，李维川１前言关于排球比赛的供能问题，多年来认识不一。８０年代前的研究认为，排球运动纯是一种有氧供能运动；８０年代的研究认为排球运动是以有氧供能为基础，有氧无氧相结合的供能运动；而９０年代又有人研究认为，...     

我的快乐我链接

[文题展示] 著名作家毕淑敏在她的作品<今世的五百次回眸>中这样写道:今生,我将用余生一千次不倦地凝望绿色,它是最美丽的归宿……喜欢山所表达的精神,就游历和瞻仰山的英拔和广博,期望自己也变得如许坚强.喜欢绿色和生命,喜爱大地的丰饶和宝贵,就爱惜资源,尊重自己也尊重他人.     

芍药属的研究(1)——国产几个野生种核型的报道

In the present paper 8 species with 15 populations of the genus Paeonia L. (if P. papaveracea and P. japonica are recognised as species) were collected from Sichuan, Shaanxi and Hebei provinces (see the Appendix for detail of the materials).  The micrographs of their somatic metaphase (also Mii in the case of P.veitchii) are shown in Plates 1-4, the karyo- type formulae, ranges of chromosome length and classification of karyotypes according to Steb- bins (1971) are shown in Table 5: the idiograms in Figs. 1-2, and the parameters of chromo- somes in Table 1-4.  The essential points are mentioned as follows:        (1)   Chromosomes of the various species in the section Modan have so far been examined and they are all diploid, the two species in the section Onaepia are also diploid, and thus tetraploids exist only in the section Paeonia.        (2)  Chromosomes in the genus Paeonia are relatively stable except for the differentiation of ploidy.  The karyotypes (Table 1-4) show no differences among different taxa in Sect. Modan and the same can also be said about the taxa in Sect. Paeonia (Table 1).  Not only are the karyotypes very similar, but also among the members within  either section have the same parameters of chromosomes, and, differences, if occur, are not statistically significant. Between the two sections, however, the situation is different. The arm ratios of the first pairs of chromosomes in Sect. Modan are 1.53, 1.52 and 1.48 (Table 1), but those in Sect. Paeonia are 1.12-1.28 (Table 2-4), 95% confidence limits are 1.46-1.60 for the section Modan and 1.07-1.28 (1.21-1.35 only for PB85078) for the section Paeonia, not overlapping, which indi- cates that the two sections have differentiated in respect of the first pairs of chromosomes.        (3)The population PB85024, which belongs to the P. obovata complex, has a karyotype of 2B (stebbins, 1971), which is a new one in the genus Paeonia. This karyotype is a stable one, for several individuals in the population are uniform in this respect, which shows that Steb- bins’ (1971) generalization that all the species in Paeonia have 2A does not hold true.        (4)  Three populations of P. obovata complex studied in this work from Sichuan and Shaanxi are all tetraploids, and one from Hebei is a diploid.  From the present work and the previcus reports, the materials from Japan and Korea, no matter whether flowers are pink or white, are diploids, those from Heilongjiang Province (with both pink and white flowers) (Liu Ming-yuan, personal communication) and from Heibei Province (with pink flowers) in China are also diploids, the one from Sakhalin (pink flowers) is tetraploid, those from Priamur of the Soviet Union are a tetraploid (with white flowers) and a diploid (with pink flowers), and those from Shaanxi (the Qinling Range) and western Sichuan (with both pink and white flowers) are all tetraploids.  As far as we have now known, ploidy in this parti- cular complex is correlated with the geographical distribution: diploids are found in the cen- tral part, tetraploids occur in the northern limits, and in the south  letraploids are the only cytotype.      (5)  The materials of P. mairei from western Sichuan and Shaanxi (the Qinling Range) are found all to be tetraploids, which shows that two cytotypes, diploid and tetraploid, exist in this  species,  but the geographical distribution pattern of these two cytotypes is to be revealed in the future investigation.     

对保障本科毕业设计（论文）质量的几点建议

高等院校的本科毕业设计是提高学生综合素质与创新能力的关键一环,也是高校教学中的一项重要内容,本文分析了目前高校毕业设计的现状与存在的问题,从多方面提出了保障毕业设计质量的工作措施。     

不锈钢纤维及其功能性纺织品的研究现状与展望

不锈钢纤维般是指以304、304L或316、316L等不锈钢为基材，经特殊工艺加工而成的直径在10μm以下的软态工业用材料。不锈钢纤维是纯金属纤维，较镍、铜、铝等其它金属纤维在可纺性、使用性、经济性等方面有明显的优越性。不锈钢金属的纤维化技术始于20世纪60年代中期，首先由美国进行开发与研究，到70年代末已在纺织、石油、化工、军事、航空、通讯、电子等许多领域都得到广泛应用。     

把数学思考融入有效课堂

有效数学课堂要更加关注学生的数学思考。在课堂教学中,教师可通过引导学生进行有效地提问、思考、交流与反思,发展学生的数学思考,使得数学课堂更加扎实有效。我的做法是：     

“校园低碳生活”的忧思与对策

为保护人类生存环境,践行低碳生活要求,我校结合实际情况,提出校园低碳生活的具体要求,即节约水电和纸张,实现教材循环利用,减少二氧化碳排放量,从点滴做起。此次活动中,我校做了很多颇有成效的工作,学校浴室、开水房和厕所都使用智能节水设备,在有水龙头的地方张贴节约用水宣传用语和图片;每班设一个节电员职位,负责班级节电工作;利用国旗下讲话,号召全体师生增强节约水电和纸张的意     

在2010年高考物理中的“世博”题

上海世博会以“城市,让生活更美好”（Better City,Bet—terLife）为主题,创造了世界博览会史上最大规模记录．为了让更多的青少年,尤其是中学生了解世博,放眼世界,作为教育工作者,我们在学生的生活、学习中都涉及到一些与世博相关的信息．纵观2010年全国各省市的物理高考试题,涉及到不少以世博为情景来考查物理知识点的新颖试题．下面笔者就从运动学、热学、电学等角度分析．