对我国出生婴儿性别比严重失衡的几点看法——目前我国计划生育工作的难点之一     

李萍 《贵州教育学院学报》2009,25(1):61-64

出生婴儿性别比严重失衡是目前我国人口面临的重大问题之一。这一现状引发了一系列严峻的经济社会问题。究其根源,在于人们传统落后的生育观念和非医学需要鉴定胎儿性别手段的滥用。转变人们的生育观念并解决好胎儿性别鉴定工具滥用问题是解决婴儿性别失调问题的根本途径。  相似文献   

基于AHP的高校教师教育技术能力评价指标体系组合权重研究   总被引：2，自引：0，他引：2  

陶祥亚  樊华 《现代教育技术》2009,19(1):63-67

文章在认真分析《江苏省高校教师教育技术能力指南》基础上,经过归纳建立了高校教师教育技术能力评价指标体系,并应用AHP法(层次分析法)对体系各级指标权重进行了定量研究并给出了一、二级指标的组合权重值。  相似文献   

粗糙集理论在学生成绩综合评价中的应用     

陈志恩 《宁夏师范学院学报》2009,30(6):21-24

在对学生成绩综合评价中引入粗糙集理论．利用该理论充分挖掘已知数据之间的联系来确定评价指标的权重,避免了传统评价方法所带来的主观性缺陷．计算实例表明了该方法的可行性和有效性．  相似文献   

位势型算子的任意权弱型(1,1)不等式的完整证明     

齐金云  张宝环 《河北职业技术学院学报》2010,(2)

利用极大算子推广了分数次积分算子的结论,得到了一般位势型算子的两个任意权弱型(1,1)不等式,并给出完整证明。  相似文献   

基于核心论文数量和被引频次双重分布的百分位数指标改进研究     

汪莉 《中国科技期刊研究》2018,29(4):400-405

【目的】 改进现有百分位数指标在揭示期刊载文量特征方面的不足,构建基于被引频次与载文量双重分布的期刊评价指标PRC。【方法】 以2016版《期刊引证报告》生物学学科的85种期刊为研究样本,通过二八定律筛选核心论文样本集,利用布拉德福区域分析法设计基于文献密度分布的载文量权重,利用百分位数建立基于被引频次分布的引文指标,构建期刊综合影响力评价指标PRC。比较PRC与其他文献计量指标的相关性,验证指标评价效果。【结果】 PRC不仅在一定程度上克服了影响因子的内在缺陷,也能合理揭示期刊的出版规模效应,很好地均衡了相对值和绝对值两类指标,改进了百分位数指标的评价效果。【结论】 PRC指标兼顾被引频次和载文量双重分布,从数量和质量两个维度衡量期刊影响力,可用于评价科技期刊的学术影响力。  相似文献   

Building muscle: nutrition to maximize bulk and strength adaptations to resistance exercise training     

《European Journal of Sport Science》2013,13(2):67-76

Abstract

Several nutritional strategies can optimize muscle bulk and strength adaptations and enhance recovery from heavy training sessions. Adequate energy intake to meet the needs of training and carbohydrate intake sufficient to maintain glycogen stores (>7 g carbohydrate·kg^?1·day^?1 for women; >8 g carbohydrate·kg^?1·day^?1 for men) are important. Dietary protein intake for top sport athletes should include some foods with high biological value, with a maximum requirement of approximately 1.7 g·kg^?1·day^?1 being easily met with an energy sufficient diet. The early provision of carbohydrate (>1 g·kg^?1) and protein (>10 g) early after an exercise session will enhance protein balance and optimize glycogen repletion. Creatine monohydrate supplementation over several days increases body mass through water retention and can increase high-intensity repetitive ergometer performance. Creatine supplementation can enhance total body and lean fat free mass gains during resistance exercise training; however, strength gains do not appear to be enhanced versus an optimal nutritional strategy (immediate post-exercise protein and carbohydrate). Some studies have suggested that β-OH-methyl butyric acid (β-HMB) can enhance gains made through resistance exercise training; however, it has not been compared “head to head” with optimal nutritional practices. Overall, the most effective way to increase strength and bulk is to perform sport-specific resistance exercise training with the provision of adequate energy, carbohydrate, and protein. Creatine monohydrate and β-HMB supplementation may enhance the strength gains made through training by a small margin but the trade-off is likely to be greater bulk, which may be ergolytic for any athlete participating in a weight-supported activity.  相似文献   

Analysis of the training load during a hypertrophy-type resistance training programme in men and women     

《European Journal of Sport Science》2013,13(4):256-264

Abstract

The purpose of this study was to analyze the specific training load during a resistance training (RT) programme designed to increase muscular hypertrophy in men and women. Thirty-four women (22.7 ± 4.1 years, 58.8 ± 11.9 kg, 162.6 ± 6.2 cm and 22.1 ± 3.6 kg.m^?2) and 30 men (22.7 ± 4.4 years, 68.4 ± 9.0 kg, 174.5 ± 6.6 cm and 22.5 ± 2.4 kg.m^?2) underwent a supervised RT programme that was divided into two phases of 8 weeks each. Training consisted of 10–12 exercises performed with three sets of 8–12 repetitions at repetition maximum resistances performed 3 times per week on nonconsecutive days. There was a significant (P < 0.05) main effect for gender by time interaction for average training load of all the exercises performed in the first 8 weeks of RT with women showing a higher relative increase than men (+43.6% vs. +32.5%, respectively). This result was not observed during the second 8-week phase of the RT programme during which no significant gender by time interaction (P > 0.05) was shown with both genders having a similar relative increase (+28.7% vs. +24.3%, respectively). Women had a higher increase than men in specific average training load of the upper limb exercises during both the first 8 weeks of training (+30.2% vs. +26.6%, respectively) and the second 8 weeks of training (+31.1% vs. +25.3%, respectively). We conclude that the adaptation in specific training load is influenced by gender.  相似文献   

一种改进的权均值粒子群优化算法     

杨艳  李树波 《人天科学研究》2013,(5):54-56

针对粒子群优化算法的早熟收敛和进化后期收敛速度慢等问题,提出了权均值粒子群优化算法。通过在“认知”部分和“社会”部分加入随机权值更新粒子的飞行速度,使粒子能够很快地收敛到全局最优点。典型函数的仿真结果表明,该算法不仅具有较好的全局收敛性能和较快的收敛速度,而且有效地避免了早熟收敛问题。  相似文献   

中国式“不差钱”与中国式“钱荒”之悖论   总被引：1，自引：0，他引：1  

杨健 《中国科学院院刊》2013,(6):781-786

最近中国式"钱荒"和前期中国式"不差钱"形成了强烈反差,并引发了全世界的关注。文章分析了对于"钱荒"目前盛行的5种假说:国际阴谋说、季节波动说、央行自制说、影子银行说和地方债务说,并从效度、信度和认知度3个维度对各种诱因进行测度评估,然后分析了中国与西方政治体制和财政体制的不同,预测了各种调控手段对未来中国经济可能造成的影响,最后得出央行应借机降低存款准备金率的建议!  相似文献   

试论高校图书馆外文期刊利用率低的原因和对策   总被引：4，自引：0，他引：4  

付筑萍 《贵州教育学院学报》2004,20(1):96-97

高校图书馆外文期刊利用率低的原因主要是：外文期刊订购经费不足：外文期刊管理工作人员素质待提高；外文期刊宣传工作做得不够；外文期刊订购传统化、单一化。针对以上情况，提出了提高外文期刊利用率的对策。  相似文献