我国经济学发展五十年的断想与反思     

周元良 《南京晓庄学院学报》1999,(3)

我国传统经济学,是指建国初到九十年代初被奉为经典的《政治经济学（社会主义部分）》,它基本上是斯大林思想和苏联计划经济体制的理论表现;它严重脱离中国经济建设实践,在社会主义市场经济的一系列重大问题面前黯然失色。西方经济学的研究成果,是社会经济发展到一定阶段出现的人类文明成果,是人类智慧结晶和共同财富;我们应当大胆借鉴西方经济学,吸收人类一切文明成果。值此国庆五十周年之际,我们要实现理论创新,把重建具有中国特色的经济学作为一项光荣使命。  相似文献   

An economic model of workplace mobbing in academe     

João Ricardo Faria  Franklin G. Mixon Jr.  Sean P. Salter 《Economics of Education Review》2012

Workplace bullying or mobbing can be defined as the infliction of various forms of abuse (e.g., verbal, emotional, psychological) against a colleague or subordinate by one or more other members of a workplace. Even in the presence of academic tenure, workplace mobbing remains a prevalent issue in academe. This study develops an economic model that employs a Stackelberg differential game in order to analyze the interaction between a university administrator (or administrators) and a professor who is being “mobbed” by university administration, perhaps for political reasons related to the professor's use of academic freedom and/or tenure to publicly criticize the actions of university officials. One of the model's implications is that it is optimal for the professor to increase his or her research in order to increase job mobility when subjected to downward mobbing, and that the university administration may succeed in pushing out the tenured professor if the administration's mobbing actions are greater than a combination of professor's optimal salary and threshold quitting rate. In the long run, however, the institution and the administrator may lose if the professor leaves and his replacements do not keep up the research productivity.  相似文献   

Effects of total dissolved gas supersaturated water on lethality and catalase activity of Chinese sucker (Myxocyprinus asiaticus Bleeker)     

Shi-chao Chen  Xiao-qing Liu  Wen Jiang  Ke-feng Li  Jun Du  Dan-zhou Shen  Quan Gong 《Journal of Zhejiang University. Science. B》2012,13(10):791-796

Total dissolved gas (TDG) supersaturation caused by dam sluicing can result in gas bubble trauma (GBT) in fish and threaten their survival. In the present study, Chinese suckers (Myxocyprinus asiaticus Bleeker) were exposed to TDG supersaturated water at levels ranging from 120% to 145% for 48 h. The median lethal concentration (LC₅₀) and the median lethal time (LT₅₀) were determined to evaluate acute lethal effects on Chinese suckers. The results showed that the LC₅₀ values of 4, 6, 8, and 10 h were 142%, 137%, 135%, and 130%, respectively. The LT₅₀ values were 3.2, 4.7, 7.8, 9.2, and 43.4 h, respectively, when TDG supersaturated levels were 145%, 140%, 135%, 130%, and 125%. Furthermore, the biological responses in Chinese suckers were studied by assaying the catalase (CAT) activities in gills and muscles at the supersaturation level of 140% within LT₅₀. The CAT activities in the gills and muscle tissues exhibited a regularity of a decrease after an increase. CAT activities in the muscles were increased significantly at 3/5LT₅₀ (P<0.05) and then came back to the normal level. However, there were no significant differences between the treatment group (TDG level of 140%) and the control group (TDG level of 100%) on CAT activities in the gills before 3/5LT50 (P>0.05), but the activities were significantly lower than the normal level at 4/5LT₅₀ and LT₅₀ (P<0.05).  相似文献   

Acute and subacute oral toxicity of Litsea elliptica Blume essential oil in rats     

Siti Balkis Budin  Seri Masran Siti Nor Ain  Baharuddin Omar  Izatus Shima Taib  Othman Hidayatulfathi 《Journal of Zhejiang University. Science. B》2012,13(10):783-790

Litsea elliptica Blume has been traditionally used to treat headache, fever, and stomach ulcer, and has also been used as an insect repellent. The acute and subacute toxicities of L. elliptica essential oil were evaluated orally by gavage in female Sprague-Dawley rats. For the acute toxicity study, L. elliptica essential oil was administered in doses from 500 to 4 000 mg/kg (single dose), and in the subacute toxicity test, the following doses were used: 125, 250, and 500 mg/kg, for 28 consecutive days. In the acute toxicity study, L. elliptica essential oil caused dose-dependent adverse behaviours and mortality. The median lethal dose value was 3 488.86 mg/kg and the acute non-observed-adversed-effect level value was found to be 500 mg/kg. The subacute toxicity study of L. elliptica essential oil did not reveal alterations in body weight, and food and water consumptions. The haematological and biochemical analyses did not show significant differences between control and treated groups in most of the parameters examined, except for the hemoglobin, mean cell hemoglobin concentration, mean cell volume, mean cell hemoglobin, serum albumin, and serum sodium. However, these differences were still within the normal range. No abnormalities or histopathological changes were observed in the liver, pancreatic islet of Langerhans, and renal glomerulous and tubular cells of all treated groups. In conclusion, L. elliptica essential oil can be classified in the U group, which is defined as a group unlikely to present an acute hazard according to World Health Organization (WHO) classification.  相似文献   

黑龙江省中老年网球运动参与现状调查研究——以2012年黑龙江省宝泰隆杯50岁以上网球参赛者为例     

李明阳 《哈尔滨体育学院学报》2013,(3):53-57

文章运用文献资料法、问卷调查法、访谈法和数理统计法对黑龙江省50岁以上网球参赛者的锻炼动机、锻炼年限、锻炼频率、经费来源、场地情况等问题进行调查,总结影响黑龙江省中老年人参加网球运动的因素。旨在为促进中老年人网球运动的发展提供理论参考,同时也为实现终身体育起推动作用。  相似文献   

Evaluating the impact of R&D tax credits on innovation: A microeconometric study on Canadian firms   总被引：1，自引：0，他引：1  

Dirk Czarnitzki  Petr Hanel  Julio Miguel Rosa 《Research Policy》2011,40(2):217-229

This study examines the effect of R&D tax credits on innovation activities of Canadian manufacturing firms. Over the 1997-1999 period the Federal and Provincial R&D tax credit programs were used by more than one third of all manufacturing firms and by close to two thirds of firms in high-technology sectors. We investigate the average effect of R&D tax credits on a series of innovation indicators such as: number of new products, sales with new products, originality of innovation, etc. using a non-parametric matching approach. Compared to a hypothetical situation in the absence of R&D tax credits, recipients of tax credits show significantly better scores on most but not all performance indicators. We therefore conclude that tax credits lead to additional innovation output.  相似文献   

Cu2+在三疣梭子蟹体内的毒性效应和积累   总被引：1，自引：0，他引：1  

陈寅儿  金珊  徐赟 《科技通报》2011,27(4):554-556

采用静态生物测定方法,将三疣梭子蟹暴露培养在含有不同Cu2+浓度的海水中(盐度22±1,pH7.5±0.5,温度(18±1)℃),分别在24、48、72和96h对三疣梭子蟹进行死亡个数统计,通过机率单位法构建三疣梭子蟹24、48、72和96 h浓度对数与机率单位的直线蚓归方程,并根据回归方程计算出三疣梭子蟹24、48、...  相似文献   

30-50岁超重人群走跑减肥运动处方的定量研究     

王竹影  李德法  陈培友 《体育与科学》2011,32(6):80-83,88

目的:研究30-50岁男女超重人群每周减脂0.5㎏、采用不同走跑方式运动的减肥运动处方。方法:32名受试按年龄和性别分组,分别采用慢跑、快走、走跑交替的方式运动,每次运动的能耗为500kcal,采用气体代谢的方法进行能量消耗测定,同步记录运动强度和运动量参数。结果:1、如果采用走跑交替的方式运动,30-40岁(41-50岁)男女每次运动的时间分别为53min、58min(60、72),距离为6210m、6063m(6808、7201),总步数为7417步、8189步(8235、9764);若以慢跑方式运动,则30-40岁男女每次运动的时间分别为43min、50min,距离为5903m、5899m,总步数为6798步、7875步;如果以快走的方式运动,则41-50岁男女每次运动时间分别为73min、87min,距离为7472m、7457m,总步数为9180步、11580步。2、步频、每分能耗与脂肪供能比例呈负相关,运动时间与脂肪供能比例、步频与每分能耗呈正相关。3、不同性别、不同走跑方式下的每分能耗不同,减肥人群可据此安排自己个性化的减肥运动处方。结论:本研究制定了30-50岁超重男女的走跑减肥运动处方,并能依照个体情况制定个性化的减肥运动方案。  相似文献   

第50届世乒赛中国男团半决赛、决赛的技战术分析   总被引：1，自引：0，他引：1  

蒋津君  徐金陆  彭博 《河北体育学院学报》2011,25(5):74-77

采用观察统计法和逻辑分析法,对参加2010年莫斯科世乒赛的中国乒乓球男队的半决赛、决赛比赛场次的技战术特征进行研究,分析了中国乒乓球男队的优势与不足,并提出了发展建议,以供今后训练参考。  相似文献   

小学四年级50米跑,实心球前抛引进“分层递进”教学的实验报告     

蔡利众  黄鹤飞  谢俊 《体育科研》1996,(1)

通过实验的方法,对体育课中引进“分层递进”教学进行尝试与探讨,阐明“分层递进”教学对促进不同层次学生的身心健康以及提高教学效果的显著意义。  相似文献