原子吸收光谱法测定TC11钛合金中微量Fe

将TC11钛合金试样经盐酸-硝酸在加热的条件下滴加氢氟酸溶解后,加入锶盐以消除基体钛及其它元素对铁的干扰,采用原子吸收分光光度法对其中铁元素含量进行了测定.结果显示,其RSD为0.7%,加标回收率为99.99%～100.05%,微量Fe的质量百分含量为0.020%.该方法测定速度快,灵敏度高,干扰小,测定结果可靠.     

“9.11”事件发生以来的加美关系

加拿大与美国两国之间的关系一直以来发展曲折而又复杂。双方在相互依存中又矛盾冲突不断,特别是"9.11"事件使两国关系蒙霜趋冷。"9.11"事件发生以来,在加美双方尤其是在加拿大历届政府的共同努力下,双边关系得到缓和和改善,但分歧与不协调依然存在。展望未来,加美两国将在"合作为主、摩擦为次"的交织中缓慢发展。     

"十一·五"规划图景之下危机治理法治化探微

"十一·五"规划的出台为我们未来五年绘制了美好的发展蓝图,同时也对社会各领域提出了切实要求.如何为社会发展构筑制度化空间则是法治的重要课题.其中频发的公共危机给我们带来哪些思考,我们应如何进一步总结成功的经验、汲取失败的教训,以弥补目前的不足,从容应对不测之危机,行政法治应当作出积极的回应.对此应当从行政法基础理论到具体制度构架予以全面的考察.     

Association between 11beta-hydroxysteroid dehydrogenase type 1 gene polymorphisms and metabolic syndrome in Bosnian population

Introduction:

The enzyme 11β-hydroxysteroid dehydrogenase type 1 (11β-HSD1) catalyzes the conversion of the hormonally inactive cortisone to active cortisol, thus facilitating glucocorticoid receptor activation in target tissues. Increased expression of 11β-HSD1 in adipose tissue has been associated with obesity and insulin resistance. In this study, we investigated the association of two 11β-HSD1 gene (HSD11B1) polymorphisms with the metabolic syndrome (MetS) and its characteristics in the Bosnian population.

Materials and methods:

The study included 86 participants: 43 patients diagnosed with MetS and 43 healthy controls. Subjects were genotyped for two HSD11B1 gene polymorphisms: rs846910: G>A and rs45487298: insA, by the high resolution melting curve analysis. Genotype distribution and an influence of genotypes on clinical and biochemical parameters were assessed.

Results:

There was no significant difference in the mutated allele frequencies for the two HSD11B1 gene polymorphisms between MetS patients and controls. In MetS patients, no significant associations between disease-associated traits and rs45487298: insA were found. Regarding rs846910: G>A variant, heterozygous patients (G/A) had significantly lower systolic (P = 0.017) and diastolic blood pressure (P = 0.015), lower HOMA-IR index (P = 0.011) and higher LDL-cholesterol levels (P = 0.049), compared to the wild-type homozygotes. In the control group, rs45487298: insA polymorphism was associated with lower fasting plasma insulin levels (P = 0.041), lower homeostasis model assessment insulin resistance (HOMA-IR) index (P = 0.041) and lower diastolic blood pressure (P = 0.048). Significant differences between rs846910: G>A genotypes in controls were not detected. Haplotype analysis confirmed the association of rs45487298: insA with markers of insulin resistance in the control subjects.

Conclusions:

Our results indicate that a common rs45487298: insA polymorphism in HSD11B1 gene may have a protective effect against insulin resistance.     

第11届全运会拳击项目决赛调研报告

通过问卷调查法、数理统计法等方法,对参加第11届全运会拳击决赛的一线教练员的基本情况以及参赛运动员的比赛技战术特点进行了深入分析。研究认为,与会65名教练员年龄结构比较合理,学历以大学本科为主,职称多以高级职称教练,多数为汉族教练员及男性教练员,拳击运动员出身的教练员占多数,且多数教练员在我国知名高等体育学府进修学习过。我国优秀拳击运动员技战术方面存在的主要问题是进攻中疏于防守,防守反击和击打力量不足,单拳进攻或组合拳不够快,对攻中的击打不够准确,防守仍然不够严密,盲目乱打乱拼,缺乏战术素养和灵活的战术思维。我国备战2012年伦敦奥运会选手的年龄结构比较合理。     

Analysis of Women＇s Gymnastics Movements in the Finale of the 11th National Games

对第11届全运会女子体操平衡木决赛成套的动作内容、难度价值及动作使用频率等进行统计,研究结果表明：规则的导向作用巨大,D组以上动作是成套可记入难度的主体,技巧动作以及舞蹈动作中高难的跳步动作是中国的优势;但是成套动作类型相对单一、多样化不够,个性不突出。建议提高教练员和运动员的艺术修养,编排中突出运动员风格,力争在转体动作和动作连接上有所创新突破。     

第11届全运会女子体操平衡木决赛动作分析

对第11届全运会女子体操平衡木决赛成套的动作内容、难度价值及动作使用频率等进行统计,研究结果表明：规则的导向作用巨大,D组以上动作是成套可记入难度的主体,技巧动作以及舞蹈动作中高难的跳步动作是中国的优势;但是成套动作类型相对单一、多样化不够,个性不突出。建议提高教练员和运动员的艺术修养,编排中突出运动员风格,力争在转体动作和动作连接上有所创新突破。     

Catching the Wave: German Media on September 11

This paper describes reactions in the German publication Der Spiegel to the attacks of September 11. The paper starts by describing the live reporting in the German media and then analyzes the Der Spiegel edition of September 15. The aim is to give an idea of how European journalists handled the situation and how different conclusions developed.     

我国乒乓球运动员在11分新赛制的比赛中心理状态调控

随着乒乓球比赛11分制的实行,在11分赛制的影响下,运动员产生各种不同的心理压力,由此在比赛过程中产生各种心理问题,从而影响原有技战术水平的发挥。通过对运动员产生的压力以及不良心理状态的分析,找出导致运动员产生心理压力的原因并根据相应的原则制定解决问题的有效措施,为乒乓球运动员适应11分赛制所进行的心理调控提供参考建议。     

Are boys left behind? The evolution of the gender achievement gap in Beijing's middle schools

Using one cohort of 7235 middle school students in Beijing, China, we examined the evolution of the gender achievement gap in middle school. Our study found a more significant female dominance than in U.S. studies: even though boys gradually caught up during middle school, especially in Math and Science, and the gender achievement gap decreased over the distribution of test scores, girls outperformed boys throughout primary and middle school and in each quartile of the performance distribution. As well, girls had a more positive school experience than boys, and boys had a higher dropout rate by the end of middle school. Despite significant gender differences in various important characteristics that have explained the gender achievement gap in the U.S., in our study, primary school test scores seemed to be the only significant source of the gender achievement gap at the end of middle school, indicating the importance of early intervention.