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1.
低氧训练促进大鼠骨骼肌组织血管生成的体视学研究 总被引：2，自引：0，他引：2
为了研究低氧、训练及低氧训练对骨骼肌组织血管生成的不同作用,采用3×3析因设计试验,将健康雄性SD大鼠72只,随机分为9组,采用免疫组织化学及生物体视学方法,检测骨骼肌组织中微血管密度参数的改变,分析低氧和运动训练两种不同的处理因素对骨骼肌组织微血管体积密度、表面积密度、长度密度的单独效应、主效应及交互作用.结果表明:CD34可较好显示骨骼肌组织的微血管.低氧处理及运动训练对骨骼肌组织微血管体积密度、表面积密度、长度密度的主效应有差别,低氧处理、运动训练的单独效应中以超低氧处理、低氧训练的效应最强,并且低氧处理与训练方式两因素之间具有协同交互作用. 相似文献
2.
Gregory R. Hancock 《Journal of Experimental Education》2017,85(1):24-35
For the two-way factorial design in analysis of variance, the current article explicates and compares three methods for controlling the Type I error rate for all possible simple interaction contrasts following a statistically significant interaction, including a proposed modification to the Bonferroni procedure that increases the power of statistical tests for deconstructing interaction effects when they are of primary substantive interest. Results indicate the general superiority of the modified Bonferroni procedure over Scheffé and Roy-type procedures, where the Bonferroni and Scheffé procedures have been modified to accommodate the logical implications of a false omnibus interaction null hypothesis. An applied example is provided and considerations for applied researchers are offered. 相似文献
3.
乐茂华 《宁德师专学报(自然科学版)》2003,15(4):339-339,355
设n是大于1的正整数,证明了如果(x,y1,y2,…,yn)是方程x!=y1!y2!…yn!的适合x＞y1≥y2≥…≥yn＞1的正整数解,则必有y1≥p以及y2＜q,其中p是不大于x的最大素数,q是大于x/2的最小系数. 相似文献
4.
构建一个包含8个一级指标和31个二级指标的游客满意度评价指标体系,通过实地随机抽样问卷调查获取巴马瑶族自治县游客满意度评价样本数据并运用SPSS软件进行因子分析,以期为民族地区县域旅游满意度评价提供实证研究参考。 相似文献
5.
A newly isolated strain EL31410, producing elastase (E. C3. 4. 4. 7) with high elastolytic activity was identified asBacillus sp. In the medium optimization, it was found that wheat bran and soybean flour hydrosate were the best crude carbon and nitrogen
source for enzyme production, respectively. Addition of corn steep flour can affect the bacterium growth and elastase production.
A fractional factorial design was applied to study the main factors that affect the enzyme production, and central composite
experimental design and response surface methodology were adopted to derive a statistical model for the effect of wheat bran
and soybean flour hydrosate on elastase production. The experimental results showed that wheat bran had positive effect but
soybean flour hydrosate had negative effect, on enzyme production. An initial concentration of 3.4% (w/v) wheat bran and 9.4%
(v/v) soybean flour hydrosate were found to be optimal for enzyme production in batch culture. The time course of elastase
production in the optimized medium composition was also described.
Project (No. 300024) supported by the Zhejiang Provincial Natural Science Foundation of China 相似文献
6.
《信阳师范学院学报(哲学社会科学版)》2016,(6):34-40
在进一步明确政府环境规制内涵的基础上,对政府环境规制进行分类并构建政府环境规制强度指标体系,选择1998年到2014年间各类政府环境规制指标,运用因子分析计算因子得分及各因子所占权重,探讨我国政府环境规制强度变化趋势及各因子作用大小,并据此提出加强政府环境规制建设的政策建议。研究认为,我国在环境规制制度的安排及其变革取向上需要进一步优化控制型环境规制以强化现行规制力度,发展促进型环境规制以完善环境规制治理结构,正确处理两类规制之间的关系以建立合理的约束—激励机制,同时加大发展环保科技的政策和资金扶持力度,积极推动环境治理的公民参与,共同建设长久高效的环保规制机制。 相似文献
7.
In testing the factorial invariance of a measure across groups, the groups are often of different sizes. Large imbalances in group size might affect the results of factorial invariance studies and lead to incorrect conclusions of invariance because the fit function in multiple-group factor analysis includes a weighting by group sample size. The implication is that violations of invariance might not be detected if the sample sizes of the 2 groups are severely unbalanced. In this study, we examined the effects of group size differences on results of factorial invariance tests, proposed a subsampling method to address unbalanced sample size issue in factorial invariance studies, and evaluated the proposed approach in various simulation conditions. Our findings confirm that violations of invariance might be masked in the case of severely unbalanced group size conditions and support the use of the proposed subsampling method to obtain accurate results for invariance studies. 相似文献
8.
This study aimed to verify the factorial structure, internal validity, reliability, and criterion validity of The Sentiments, Attitudes and Concerns about Inclusive Education Revised Scale (SACIE-R) in an Italian sample. The SACIE-R is a useful tool to measure three aspects of teachers’ perceptions about inclusion, which are Sentiments, Attitudes and Concerns, providing valuable information to address the needs of teachers working with special students. A measure of this construct is currently not available in Italian, and a validation process is required. In order to provide an initial psychometric evaluation of the Italian adaptation, the SACIE-R was translated for use in Italian-speaking populations. Four hundred Italian teachers enrolled in educational teaching courses completed the SACIE-R. Confirmatory factor analyses demonstrated a good fit to the hypothesised 3-factor model, and adequate internal consistency for the scale was evidenced. A confirmatory factor analysis showed the same factor structural validity as the original instrument (although some items in the original version were deleted). Furthermore, taken together, the results showed a good level of reliability, and convergent and discriminant validity. Finally, the Italian version of the SACIE-R has good psychometric characteristics that can make it a useful measure of teacher attitude toward inclusion in the Italian educational context. 相似文献
9.
Iain Greenlees Andrew Lane Richard Thelwell Tim Holder Gina Hobson 《Research quarterly for exercise and sport》2013,84(4):477-487
Abstract The aim of this study was to develop and validate a team-referent attribution scale. Conducted over three studies, Study 1 modified items from McAuley, Duncan, and Russell's (1992) Causal Dimension Scale II by rewording items to reflect team attributions and adding one item per factor. This led to the development of a 16-item scale (Causal Dimension Scale-T, CDS-T). Study 2 tested competing models of attribution theory among a sample of 433 team sport players. Confirmatory factor analysis indicated strongest support for a four-factor model (robust comparative fit index = .961; root mean squared error of approximation = .054). Study 3 tested the predictive validity of the scale among a sample of 201 team players. Results indicated that winners reported more internal and stable attributions than losers. Further, performances perceived as successful were associated with stable attributions. The results of the study, therefore, suggest that the CDS-T provides a valid measure of team-referent attributions in sport. 相似文献
10.
Abstract The purpose of this initial predictive validity study was to determine the ability of measures derived from the Athletes' Perceptions of Coaching Competency Scale II – High School Teams (APCCS II-HST) to predict satisfaction with the head coach. Specification of the statistical model was informed by the mediational model of coach–athlete interactions. The technical quality of the satisfaction measure was evaluated before testing the predictive validity of the coaching competency measures. Data were collected from athletes of seven sports. Athlete observations (N = 748) were clustered within teams (G = 74). Multi-group confirmatory factor analyses (CFA) provided evidence for factorial invariance of a reduced version of the satisfaction measure by athlete gender. Multi-level CFA provided evidence of model–data consistency for a reduced version of the satisfaction measure. Multi-level structural equation modelling provided evidence for the ability of latent coaching competency to positively predict latent satisfaction at both the athlete level (technique competency and motivation competency) and the team level (coaching competency) and for close model–data fit. Implications of this study include: that the APCCS II-HST should be viewed as a replacement for the Coaching Competency Scale when the intended population is appropriate; a preliminary multi-level measurement model for satisfaction with one's coach that should be considered as a potential starting point in subsequent studies; and empirical support for a key relationship proposed in the mediational model of coach–athlete interactions. 相似文献