高职学院教师工作情况评价的数学模型

如何科学、合理地评价教师的工作,以利于充分调动广大教师的积极性,一直是学院教学管理部门研究的课题,也是广大教师密切关注的问题.本文将构建评价教师工作情况的指标体系并运用层次分析法建立了评价教师工作的数学模型,提出了一种定量的评价方案,供大家参考。     

美国数学学会期刊分析及其对中国数学领域学会办刊的启示

【目的】 分析美国数学学会期刊出版布局、刊群建设和学会对期刊发展所起的作用,为我国数学领域学会期刊建设提供参考。【方法】 采用文献分析法和网络调研法,研究美国数学学会期刊建设情况,并总结我国数学领域学会的期刊发展现状和特点。【结果】 创办新刊,发行电子期刊,OA出版,期刊集团化、集群化发展,建立国际化出版平台,建立评奖制度等是美国数学学会促进期刊发展采取的措施。我国数学领域学会在期刊出版、数字化平台建设及国际化发展方面有待进一步提高。【结论】 采取优化科技期刊出版结构布局、推进科技期刊集群化发展、打造具有国际竞争力的数字化学术出版和传播平台、加大对期刊的宣传推介和政策扶持力度等策略,可促进我国数学领域科技期刊发展。     

基于MATLAB教学平台的高职数学教学改革与实践

针对高职数学教学现状,讨论了高职数学教学中教学内容及教学方法改革的必要性。同时,简要地介绍了MATLAB软件,并举例说明了利用其进行数学实验教学的优点和作用。     

人类科学中现有经典极限论的终结(Ⅱ)

进一步分析、揭示了现有经典极限论在理论上与实际操作中的三个主要缺陷,宣告经典极限论的终结.     

制约逻辑在人工智能中的应用

本文从数理逻辑对人工智能发展的局限出发,分析了制约逻辑与人工智能的辩证关系,最后总结了制约逻辑为人工智能的智能模拟提供了理论基础和推理作用。     

Variable versus constant power strategies during cycling time-trials: Prediction of time savings using an up-to-date mathematical model

Abstract

Swain (1997 Swain, D. P. 1997. A model for optimizing cycling performance by varying power on hills and in wind. Medicine and Science in Sports and Exercise, 29: 1104–1108. [Crossref], [PubMed], [Web of Science ®] , [Google Scholar]) employed the mathematical model of Di Prampero et al. (1979 Di Prampero, P. E., Cortili, G., Mognoni, P. and Saibene, F. 1979. Equation of motion of a cyclist. Journal of Applied Physiology, 47: 201–206. [PubMed], [Web of Science ®] , [Google Scholar]) to predict that, for cycling time-trials, the optimal pacing strategy is to vary power in parallel with the changes experienced in gradient and wind speed. We used a more up-to-date mathematical model with validated coefficients (Martin et al., 1998 Martin, J. C., Milliken, D. L., Cobb, J. E., McFadden, K. L. and Coggan, A. R. 1998. Validation of a mathematical model for road cycling power. Journal of Applied Biomechanics, 14: 276–291. [Crossref], [PubMed], [Web of Science ®] , [Google Scholar]) to quantify the time savings that would result from such optimization of pacing strategy. A hypothetical cyclist (mass = 70 kg) and bicycle (mass = 10 kg) were studied under varying hypothetical wind velocities (?10 to 10 m · s^?1), gradients (?10 to 10%), and pacing strategies. Mean rider power outputs of 164, 289, and 394 W were chosen to mirror baseline performances studied previously. The three race scenarios were: (i) a 10-km time-trial with alternating 1-km sections of 10% and ?10% gradient; (ii) a 40-km time-trial with alternating 5-km sections of 4.4 and ?4.4 m · s^?1 wind (Swain, 1997 Swain, D. P. 1997. A model for optimizing cycling performance by varying power on hills and in wind. Medicine and Science in Sports and Exercise, 29: 1104–1108. [Crossref], [PubMed], [Web of Science ®] , [Google Scholar]); and (iii) the 40-km time-trial delimited by Jeukendrup and Martin (2001 Jeukendrup, A. E. and Martin, J. 2001. Improving cycling performance: How should we spend our time and money?. Sports Medicine, 31: 559–569. [Crossref], [PubMed], [Web of Science ®] , [Google Scholar]). Varying a mean power of 289 W by ± 10% during Swain's (1997 Swain, D. P. 1997. A model for optimizing cycling performance by varying power on hills and in wind. Medicine and Science in Sports and Exercise, 29: 1104–1108. [Crossref], [PubMed], [Web of Science ®] , [Google Scholar]) hilly and windy courses resulted in time savings of 126 and 51 s, respectively. Time savings for most race scenarios were greater than those suggested by Swain (1997 Swain, D. P. 1997. A model for optimizing cycling performance by varying power on hills and in wind. Medicine and Science in Sports and Exercise, 29: 1104–1108. [Crossref], [PubMed], [Web of Science ®] , [Google Scholar]). For a mean power of 289 W over the “standard” 40-km time-trial, a time saving of 26 s was observed with a power variability of 10%. The largest time savings were found for the hypothetical riders with the lowest mean power output who could vary power to the greatest extent. Our findings confirm that time savings are possible in cycling time-trials if the rider varies power in parallel with hill gradient and wind direction. With a more recent mathematical model, we found slightly greater time savings than those reported by Swain (1997 Swain, D. P. 1997. A model for optimizing cycling performance by varying power on hills and in wind. Medicine and Science in Sports and Exercise, 29: 1104–1108. [Crossref], [PubMed], [Web of Science ®] , [Google Scholar]). These time savings compared favourably with the predicted benefits of interventions such as altitude training or ingestion of carbohydrate-electrolyte drinks. Nevertheless, the extent to which such power output variations can be tolerated by a cyclist during a time-trial is still unclear.     

建立公共图书馆的数学模型和指标体系

The mathematical model and target system should be set up in public libraries in line with the library's selflaw and the national conditions of china,so as to provide basis for the library's developing strategy and the master plan and for drawing up the library's working plan as well.The paper puts forward the 16 targets that should be incorporated in a mathematical model.3 tabs.     

中学数学教育应该多样化

中学数学教育应该多样化,多样化有利于人才培养与社会人才结构互补,多样化有利于加速推动中学数学教育改革,多样化是可行的。     

浅议数学思维能力

数学活动中,人们对数学对象按照思维规律进行着理性的思维,这种思维培养人的数学素质,训练了人的精神,养成了人的工作习惯.逻辑思维、形象思维、直觉思维是数学思维的主要形式,这些形式有着各自不同的特点,在学习中可以根据思维形式的不同,运用不同的学习方法,达到接受教育训练的目的.     

《数学模型》在培养学生综合能力中的作用

《数学模型》是应用数学学科的一个范畴,它要求我们在解决实际问题时,注意对问题进行分析、简化,将其转化为一个数学问题,然后采用适当的数学方法,利用计算机工具去解决.《数学模型》这门课程作为高校计算机专业或数学专业的一门必修课程有其重要性.而且,《数学模型》在培养高校学生综合能力方面也发挥着非常重要的作用.