区间-粒子群算法求解非线性方程组     

刘大平  何平 《内江师范学院学报》2010,25(12):21-23

将粒子群算法的群体搜索优点和区间算法的区间分析相结合,提出了一种求解非线性方程组的区间-粒子群算法.在迭代过程中,先用粒子群算法的全局收敛性和群体搜索能力得到近似解,再用区间算法的精确搜索能力快速得到高精度的解.数值实验表明：该算法能在较大范围的初始区间内快速可靠的迭代得到高精度的解,是求解非线性方程组的一种有效的算法.  相似文献   

徘徊在现代性门前——《海上花列传》文本意义研究     

池丽君 《福建师大福清分校学报》2010,(4):59-63

《海上花列传》诞生于十九世纪末的上海租界,以长三书寓为主要的书写对象,从花街柳巷这一特殊的公共领域入手,以此来观照西方物质文明和生活方式输入后对上海产生的影响。作者韩邦庆尝试用传统的叙事方式来书写他对一个新兴都市的认知与记忆,《海上花列传》的文本意义由此获得了多重性：既体现出新兴都市中的现代性因素的萌芽,又完成了对中国古典小说美学的一次回归,同时凸显了传统文人在面对现代文明对传统文化冲击时的彷徨和犹疑。  相似文献   

国家空间能力测度与国际比较研究     

国家空间能力测度与国际比较研究 《科学学研究》2013,(5):666-0

健全可靠的空间能力已经成为当前国家生存和发展的战略基础,全面准确的测度则是评估空间能力、制定国家空间政策的重要保障。从对空间活动的理论分析入手,总结了空间活动的主体及其能力属性,并在此基础上重新界定了国家空间能力,提出了国家空间能力测度指标体系;研究了空间产业分类、空间专利数据获取方法,分析比较了大量国内外公开数据源,并结合调查数据,解决了空间能力测度中的数据获取难问题;最后,对包括我国在内的八个主要国家（和地区）的空间能力进行测度与国际比较研究。  相似文献   

Establishing a practical treadmill sprint as an alternative to the Wingate anaerobic test     

Greg L. McKie  Hashim Islam  Logan K. Townsend  Greg J. Howe 《Measurement in physical education and exercise science》2018,22(2):138-144

This study examined the validity and reliability of a 30-second running sprint test using two non-motorized treadmills compared to the established Wingate Anaerobic Test. Twenty-four participants completed three sessions in a randomized order on a: (1) manual mode treadmill (Woodway); (2) specialized interval training treadmill (HiTrainer); and (3) Wingate cycle ergometer. In a subset of 15 participants, 2 additional sessions were completed on both treadmills to establish the test–retest reliability. Peak (Woodway: r = .68; HiTrainer: r = .58; p < .003), average (Woodway: r = .82; HiTrainer: r = .72, p < .001), and minimum (Woodway: r = .64; HiTrainer: r = .42, p < .043) speed indices were moderately to very strongly correlated with corresponding Wingate Anaerobic Test outputs and had excellent test–retest reliability (all intraclass correlation coefficients > .75). Fatigue index during the Wingate Anaerobic Test (51.20 ± 7.14%) was moderately correlated with the Woodway (32.9 ± 10.9%, r = .55, p = .005) only. This 30-second running sprint test may be a valid and reliable mode-specific alternative to the Wingate Anaerobic Test.  相似文献   

Using an R shiny to enhance the learning experience of confidence intervals          下载免费PDF全文

Immanuel James Williams  Kelley Kim Williams 《Teaching Statistics》2018,40(1):24-28

Many students find understanding confidence intervals difficult, especially because of the amalgamation of concepts such as confidence levels, standard error, point estimates and sample sizes. An R Shiny application was created to assist the learning process of confidence intervals using graphics and data from the US National Basketball Association.  相似文献   

Food intake and appetite following school-based high-intensity interval training in 9–11-year-old children     

Anna Morris  Robert Cramb 《Journal of sports sciences》2018,36(3):286-292

Using a randomised cross-over design, free-living lunch intake and subjective appetite were examined in 10 children (9.8 ± 0.6 years) following high-intensity interval training (HIIT) versus a control sedentary (SED) period, within a school setting. The 22-min HIIT took place during a regular PE lesson and consisted of two rounds of 4 × 30 s sprints. Foods were offered at a regular school lunch immediately following HIIT and SED and were matched between conditions. All food was covertly weighed before and after the meal. Hunger, fullness and prospective consumption were reported immediately before and after HIIT/SED, using visual analogue scales. Heart rate was higher during HIIT than SED (159.3 ± 23.1 vs. 76.9 ± 2.2 bpm, P < 0.05). Lunch energy intake was not different (P = 0.52) following HIIT, compared to SED (2.06 ± 0.35 vs. 2.09 ± 0.29 MJ, respectively). There were no significant differences in macronutrient intake or subjective appetite (P > 0.05). Results suggest that HIIT can be implemented in a PE lesson immediately before lunch, without causing a compensatory increase in food consumption.  相似文献   

我国众创空间产业政策评价与改进策略   总被引：1，自引：0，他引：1  

柯玉珍 《科技管理研究》2018,(6)

基于数量统计方法设计的政策测量方法对2015年、2016年中央和地方(以北京市、上海市、深圳市、杭州市为例)出台的众创空间产业政策进行量化分析并比较分析中外创新创业产业政策存在的差异。研究结果表明,我国众创空间产业政策的发展在取得一定成效的同时,在政策连续性、权威性、金融支持力度方面存在问题。进一步提出促进众创空间可持续发展的改进策略,助推众创空间成熟产业政策体系的形成。  相似文献   

基于“投入-实施-产出”分析模型的众创空间知识产权服务网络研究     

石家齐  宋伟 《科技管理研究》2018,(8)

当今"双创"潮流下众创空间这一新型创业生态系统在国内各地迅猛发展,众创空间的发展与知识产权密不可分,做好知识产权服务能为这种新型经济模式提供有力支撑。基于创业生态系统提出众创空间的三维空间模型,围绕该模型探讨众创空间知识产权服务网络与创业生态系统的双向影响关系;并基于"投入-实施-产出"(IPO)分析模型剖析众创空间投入-实施-产出3阶段的知识产权服务网络运行现状,从环境生态圈资源供给匹配度分析服务网络运行不佳的原因,提出服务网络构建思路。  相似文献   

实现耐力性竞速项目突破的关键问题     

邓运龙 《南京体育学院学报(社会科学版)》2010,24(4):109-111

耐力及其速度耐力涉及的运动项目众多,而我国普遍落后,其根源在于对认识项目本质、确立训练指导思想和选择训练方法上还多有差距。本文较系统地提出了耐力性竞速项目,如中长跑项目,从深刻认识运动项目本质,重点发展主导及其核心竞技能力和选择间歇训练方法的途径为着力点,以期能对教练员和科研人员以启发与借鉴,推动这类项目的发展与突破。  相似文献   

快速力量训练负荷的确定     

苏彦炬  袁艳  吴贻刚 《河北体育学院学报》2012,(2):49-52

确定适宜的训练负荷是力量训练的核心,力量训练中负荷所涉及的任何一个变量发生变化都会影响力量训练的效果。采用文献资料法、逻辑分析法,重点探讨快速力量训练中负荷强度的范围,并以举重、乒乓球项目为例,分析不同项目快速力量训练负荷强度特征。并对最大功率法负荷强度的确定、快速力量训练中的动作速度、练习的重复次数和组数、组间间歇等变量进行分析和评述,旨在丰富快速力量训练理论,为训练实践提供理论参考。  相似文献