浅谈篮球原地单手肩上投篮教材教法

篮球原地单手肩上投篮教材是新的《体育与健康大纲》中规定的一项基本教材,原地肩上投篮技术动作看似简单,但在实际教学中学生却难以掌握,很容易出现抓甩球、肘关节过度外张、投篮弧度低等问题.根据篮球教学的方式方法、篮球原地单手肩上投篮教材以及学生掌握篮球技术动作的特点,通过资料分析法、教学实践法对此教法进行研究.     

浅谈篮球比赛中假动作的运用

在篮球比赛中假动作的运用非常广泛.在篮球比赛中运用假动作能够使对手做出错误的判断和行为,从而实现真实意图动作,在篮球比赛中具有一定的应用价值.     

Emotional Labour in Magazine Work

This ethnographic research concerns the management of emotions in the editorial offices of the Finnish fashion-oriented lifestyle magazines, Elle Finland and Trendi. The material was collected through focused interviews and participant observation in editorial shoots. The analysis focuses on the informants’ ways of acting in the editorial shoots and their experiences in their work and the role of emotions in content production and co-operative work practices. The study demonstrates that emotional labour is required in production of content that is aimed to move, please or surprise the model reader and through her, the actual readers of the magazine. The members of the photography team are inclined to suppress feelings of anxiety and at the same time support and encourage other team members and the photographed subject. Emotional labour maintains stability in a tightly scheduled and goal-oriented teamwork, and enables team members to attune to the intimate and convivial atmosphere. The study also gives evidence about cruel optimism as it points out how magazine staff adjust to the uncertainty of the magazine field and the increased personal workload by invoking in themselves feelings of enjoyment and suppressing feelings of strain.     

第十七届世界杯足球赛进球情况研究

本文运用电视直播观察、录像及文献资料,对第十七届世界杯全部64场进球的配合形式、时间、射门动作方法及队员位置分布的统计结果进行分析与研究表明:边路进攻是最致命的进球配合形式,比赛75min-90min是进球的最高峰,但各时间段进球数较平均,总体上随着比赛时间的延续进球数逐步递增.脚内侧、脚背内侧、头顶球的射门进球数量最多,效果最佳,前锋进球最多,是各队攻城拔寨的"突击手",简炼、快速、准确是射门动作的发展方向.     

绿竹笋的石蜡切片制作

对绿竹笋组织块进行取材、固定、浸蜡、脱水、包埋、切片、染色等一系列过程的研究，掌握了绿竹笋石蜡切片制作方法，为进一步从解剖学上观察和研究绿竹笋老化机制提供了基础．     

2004～2005赛季CUBA三分球的数据分析

通过对2004—2005赛季CUBA联赛三分远投数据资料分析,以及与CBA、世界强队的有关数据进行比较,我们发现:三分球在CUBA中对个人得分、全队得分以及球队成绩的取得发挥了巨大的作用,但也存在命中率低,发挥不稳定和优秀的远投选手少的现象。建议在重视三分远投运用的同时,提高三分远投在强对抗下的命中率、提高三分远投的稳定性、培养更多的三分远投选手。     

无患子丛生芽诱导及植株再生研究

以无患子叶片为外植体,通过正交试验,研究无患子叶片愈伤组织诱导、愈伤组织诱导丛生芽、芽苗生根以及植株再生的最佳培养基组成。并对试验数据进行极差分析和方差分析。结果表明：诱导出叶片愈伤组织的最佳培养基是MS＋0．5mg·L^-1 TDZ＋0．4mg·L^-12,4-D＋6．0mg·L～AgN03,诱导率为86．4％。诱导丛生芽的最佳培养基是MS＋0．5mg·L^-1NAB．＋1．0mg·L^-1TDZ,分化率为42．5％。诱导生根的最佳培养基是1／3MS＋0．5mg·L^-16-BA＋0．5mg·L^-12,4-D,生根率为45％。     

美洲商陆茎尖组培体系的初步研究

为了转染植物耐受和富集重金属相关基因提供合适的组织材料,同时为了建立大面积重金属污染的植物修复基地提供组培苗保障,实验以美洲商陆(Phytolacca americana L.)无菌苗的茎尖为外植体,通过选用不同生长素以及调节生长素浓度对外植体进行增殖,诱导芽和根的生长,建立了美洲商陆茎尖组织培养实验体系。诱导芽增殖的最佳培养基为:MS+0.1 mg/L 6-苄基腺嘌呤(6-BA)+0.1mg/L赤霉素(GA3)+300 mg/L水解乳蛋白(LH)+30 g/L蔗糖+9.0 g/L琼脂,pH5.8。诱导根增殖的最佳培养基为:1/2 MS+0.4 mg/L吲哚丁酸(IBA)+0.1 mg/L GA3+300 mg/L LH+15 g/L蔗糖+9.0g/L琼脂,pH5.8。采用该方法,萌发期和成苗期分别比文献报道缩短了5 d和6 d;建立了美洲商陆茎尖组织培养实验体系。     

Impact of elevated CO2 concentration under three soil water levels on growth of Cinnamomum camphora

Forest plays very important roles in global system with about 35% land area producing about 70% of total land net production. It is important to consider both elevated CO2 concentrations and different soil moisture when the possible effects of elevated CO2 concentration on trees are assessed. In this study, we grew Cinnamomum camphora seedlings under two CO2 concentrations （350 μmol/mol and 500μmnol/mol） and three soil moisture levels [80%, 60% and 40% FWC （field water capacity）] to focus on the effects of exposure of trees to elevated CO2 on underground and aboveground plant growth, and its dependence on soil moisture. The results indicated that high CO2 concentration has no significant effects on shoot height but significantly impacts shoot weight and ratio of shoot weight to height under three soil moisture levels. The response of root growth to CO2 enrichment is just reversed, there are obvious effects on root length growth, but no effects on root weight growth and ratio of root weight to length. The CO2 enrichment decreased 20.42%, 32.78%, 20.59% of weight ratio of root to shoot under 40%, 60% and 80% FWC soil water conditions, respectively. And elevated CO2 concentration significantly increased the water content in aboveground and underground parts. Then we concluded that high CO2 concentration favours more tree aboveground biomass growth than underground biomass growth under favorable soil water conditions. And CO2 enrichment enhanced lateral growth of shoot and vertical growth of root. The responses of plants to elevated CO2 depend on soil water availability, and plants may benefit more from CO2 enrichment with sufficient water supply.     

适用于电力推进船舶的高升压比Z源逆变器

为克服电力推进船舶变换器的不足,结合Z源逆变器的原理,提出一种新式高升压比Z源逆变器。对该新式Z源逆变器工作原理进行详细分析,并与普通高升压比Z源逆变器和传统Z源逆变器的各项稳态数据进行对比。与传统的Z源逆变器相比,该新式Z源逆变器升压能力强,能适应负载大范围的变化。仿真结果证实了新式Z源逆变器具有较高的性能,适合在电力推进船舶上应用。