收藏信息     

醒民 《收藏》2001,(3):29-29

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培训数理经济学家     

I.N.切雪姆尼克  吴驯叔 《高等教育研究》1983,(1)

经济科学的现况和社会主义经济发展对经济科学的要求,编造计划和从事经济实践的日常需要——这一切均对以培训受有广博教育的经济学家为目标的高等教育提出了新的任务。时到今天,经济的许多方面,仅用逻辑模型来研究已变得越来越不可能了。经济学家不能用严格的数学形式去构造经济过程和经济现象的模型。数学方法的应用能使我们就最广泛的一类经济问题——从全国经济范围到部门经济或工业中的生产计划——获得  相似文献   

美国公共图书馆正在进入电子时代     

V·I·德威特  张雨声 《图书馆建设》1985,(3)

近四分之三世纪以来,纽约公共图书馆目录室里沉重的橡木目录柜和霉烂、折角的目录卡片一直是无数专家学者与学生追求知识的导引。然而,今年一月,卡片目录排完了它的最后一张记有书名、著者与书号的款目后,不再增加。作为该馆四千五百万美元翻建规划的一部分,目录室已经实现了计算机化。它的八千九百七十三个目录抽屉和一千万张目录卡片已被一个中心数据库和五十台低平面终端所代替。检索图书时,读者只要在终端的键盘上打进一书的题目或标题,  相似文献   

Seven days that shook the world     

Griffin H  Wilmut I 《New scientist (1971)》1997,153(2074):49

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论学生在综合工程教育及具体学科学习过程中的适应性问题     

M.K.库罗索  G.I.基里林  M.K.利兹里清可 《职教通讯(江苏技术师范学院学报)》2007,13(3)

现实中学生在综合工程教育及具体学科学习的适应性问题往往被忽视.众所周知,知识结构体系无论是从基本到复合,从初级到高级,都没有空白和跳跃,也没有重要与不重要、需要与不需要、有用与无用之区别,这就需要对教育体制系统进行重新审视.这种对于多层次的教育系统中各种关联的考察可被视为在专家预备教育的科学体系组织轨迹中的第一步尝试.  相似文献   

An online, interactive approach to teaching neuroscience to adolescents   总被引：1，自引：0，他引：1  

Miller L  Moreno J  Willcockson I  Smith D  Mayes J 《CBE life sciences education》2006,5(2):137-143

Most of today's students are skilled in instant messaging, Web browsing, online games, and blogs. These have become part of the social landscape and have changed how we learn and where we learn. The question becomes how to harness the attractiveness and ubiquity of electronic venues toward the goal of teaching neuroscience. At the Rice University Center for Technology in Teaching and Learning, a central focus is the creation of innovative materials that appeal to middle school students. A recent project was undertaken through a Science Education Drug Abuse Partnership Award (R25 DA15063) from the National Institute on Drug Abuse to inform adolescents about the neurobiology of substance abuse and the current research dealing with a class of drugs known as club drugs. Problem-based learning, multimedia pedagogy, and the National Science Content Standards were integrated to produce The Reconstructors, an episodic series available via the World Wide Web at http://reconstructors.rice.edu. A field test of students from five schools assessed the retention of content after "playing" The Reconstructors series titled Nothing to Rave About. Gain scores indicated that middle school students' knowledge about club drugs and the basic neuroscience concepts that explain their effects improved significantly.  相似文献   

Bilateral inter-arm coordination in freestyle swimming: effect of skill level and swimming speed   总被引：1，自引：1，他引：0  

Nikodelis T  Kollias I  Hatzitaki V 《Journal of sports sciences》2005,23(7):737-745

The aim of this study was to examine the influence of level of skill and swimming speed on inter-limb coordination of freestyle swimming movements. Five elite (2 males, 3 females; age 18.9+/-1.0 years, height 1.71+/-0.04 m, body mass 62.1+/-7.0 kg) and seven novice (age 22.0+/-2.0 years, height 1.77+/-0.04 m, body mass 74.8+/-9.0 kg) swimmers swam a sprint and a self-paced 25 m freestyle trial. The swimming trials were recorded by four digital cameras operating at 50 Hz. The digitized frames underwent a three-dimensional direct linear transformation to yield the three-dimensional endpoint kinematic trajectories. The spatio-temporal relationship between the upper limbs was quantified by means of the peak amplitude and time lag of the cross-correlation function between the right and left arm's endpoint trajectories. A strong anti-phase coupling between the two arms, as confirmed by peak amplitudes greater than 0.8, was noted for both groups and swimming speeds. Significantly higher (P<0.05) peak amplitudes were observed for the sprint compared with self-paced swimming. No significant differences in the strength of inter-limb coupling were noted between the elite and novice swimmers (P>0.05). Time lags were very close to 0 ms and did not differ between groups or swimming speeds. We conclude that in freestyle swimming, the intrinsic anti-phase (180 degrees phase difference) inter-limb relationship is strongly preserved despite the physically powerful environmental influence of the water and this "preferred" pattern is not affected by level of skill. In contrast, increasing movement speed results in stronger inter-limb coupling that is closer to the anti-phase inter-limb relationship.  相似文献   

A novel method for the performance of isometric exercise in the home     

Wiles JD  Coleman D  Dunford M  Swaine I 《Journal of sports sciences》2005,23(8):795-803

There is a paucity of research on devices suitable for home-based isometric exercise. Our aim was to compare cardiovascular responses to isometric exercise using novel and established methods. Ten individuals (age 34.0 +/- 8.5 years, mass 68.2 +/- 10.4 kg, height 1.72 +/- 0.09 m; mean +/- s) performed three different isometric exercise protocols with 48 h between each. Each protocol involved four repeated exercise bouts of 2 min at 30% maximum voluntary contraction force using alternate legs (transducer), alternate arms (transducer), or alternate arms (novel device). Systolic blood pressure, diastolic blood pressure, mean arterial blood pressure and heart rate were measured every 30 s. The highest (peak) values during each 2 min bout of exercise were recorded (peak systolic blood pressure, peak diastolic blood pressure, peak mean arterial blood pressure and peak heart rate). At the end of each 2 min exercise bout, the participants rated their perceived discomfort using Borg's CR-10 scale. There was a statistically significant difference in peak systolic blood pressure between isometric arm flexion using the force transducer and the novel device [158.1 +/- 10.8 vs. 149.1 +/- 13.9 mmHg (mean +/- s); P = 0.02]. Further analysis showed that peak systolic blood pressure was on average 9 mmHg higher using the force transducer with limits of agreement of - 15.97 to 33.97 mmHg. Analysis of the peak diastolic blood pressure, peak mean arterial blood pressure, peak heart rate and CR-10 data revealed no statistically significant differences between the three protocols. These results suggest that this novel, home-based method elicited similar cardiovascular responses during isometric exercise to those of established laboratory-based methods. However, the lower peak systolic blood pressure using the modified scales warrants further investigation before this method is used widely in the home.  相似文献   

The effect of venue and wind on the distance of a hammer throw     

Hunter I 《Research quarterly for exercise and sport》2005,76(3):347-351

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Tracking and explanation of physical activity in young adults over a 7-year period     

De Bourdeaudhuij I  Sallis J  Vandelanotte C 《Research quarterly for exercise and sport》2002,73(4):376-385

Tracking and explaining physical activity in young adults was investigated in a 7-year longitudinal design. From a representative sample of 980 respondents at baseline (M age = 21 years), 172 respondents, comprising 18% of the original sample, completed psychosocial questionnaires and were interviewed at home to assess their level of physical activity at follow-up. Psychosocial variables were grouped into four groups: social variables, self-efficacy, perceived benefits, and perceived barriers. Drop-out analyses showed no major differences between the baseline and follow-up samples. The aims of the present study were: (a) to investigate tracking in physical activity and psychosocial determinants over a 7-year period, and (b) to examine baseline determinants and change in determinants in predicting physical activity change in men and women. No significant tracking of physical activity level was found for men. For women, moderate tracking scores were found for total energy expenditure and moderate-intensity energy expenditure (r = .34 and .41, respectively). There was higher tracking in psychosocial determinants than in physical activity. Relatively high tracking scores for perceived benefits and barriers suggest that cognitions related to physical activity are more stable than the behavior itself. Although baseline psychosocial variables were poor predictors of physical activity change, determinants'change scores accounted for 16-19% of the variance in physical activity in men and 7-24% in women. Significant predictors were different for men and women. Present results can inform the design of physical activity interventions for these populations.  相似文献