釜山亚运反思北京奥运展望

第十四届釜山亚运会 ,中国代表团以绝对优势 ,位于亚洲各国之首 ,但是与世界体育强国相比较 ,还有一定的差距。本文通过对釜山亚运会的反思 ,具体分析我国的优势项目与不足之处 ,在今后的 6年中 ,全面改进 ,才能使中国军团在北京奥运会再创佳绩。     

强苯赛对水稻幼苗根系生长的影响

强苯赛浸种对水稻幼苗的根长、根重和根系体积都有促进作用,能提高根尖细胞分裂指数,能使胚根尖切段伸长和发根力增强,并能提高胚乳中淀粉酶活性和根系的呼吸强度。     

论西部大开发的主体与客体

本文提出西部大开发的主体是全国人民 ,客体为西部资源 ,并在此基础上探讨了西部教育资源开发观。     

Dose-Response and Risk Assessment of Airborne Hexavalent Chromium and Lung Cancer Mortality

This study evaluates the dose-response relationship for inhalation exposure to hexavalent chromium [Cr(VI)] and lung cancer mortality for workers of a chromate production facility, and provides estimates of the carcinogenic potency. The data were analyzed using relative risk and additive risk dose-response models implemented with both Poisson and Cox regression. Potential confounding by birth cohort and smoking prevalence were also assessed. Lifetime cumulative exposure and highest monthly exposure were the dose metrics evaluated. The estimated lifetime additional risk of lung cancer mortality associated with 45 years of occupational exposure to 1 microg/m3 Cr(VI) (occupational exposure unit risk) was 0.00205 (90%CI: 0.00134, 0.00291) for the relative risk model and 0.00216 (90%CI: 0.00143, 0.00302) for the additive risk model assuming a linear dose response for cumulative exposure with a five-year lag. Extrapolating these findings to a continuous (e.g., environmental) exposure scenario yielded an environmental unit risk of 0.00978 (90%CI: 0.00640, 0.0138) for the relative risk model [e.g., a cancer slope factor of 34 (mg/kg-day)-1] and 0.0125 (90%CI: 0.00833, 0.0175) for the additive risk model. The relative risk model is preferred because it is more consistent with the expected trend for lung cancer risk with age. Based on statistical tests for exposure-related trend, there was no statistically significant increased lung cancer risk below lifetime cumulative occupational exposures of 1.0 mg-yr/m3, and no excess risk for workers whose highest average monthly exposure did not exceed the current Permissible Exposure Limit (52 microg/m3). It is acknowledged that this study had limited power to detect increases at these low exposure levels. These cancer potency estimates are comparable to those developed by U.S. regulatory agencies and should be useful for assessing the potential cancer hazard associated with inhaled Cr(VI).     

高职工科物理教学与学生能力的培养

高等职业技术教育的任务之一 ,就是培养学生的动手能力和实践能力。通过物理课的教学 ,可以培养学生的思维能力、动手实践能力、分析问题和解决问题的能力。     

浅谈大学英语的翻译教学

近年来英语专业本科生的翻译能力普遍低下 ,本文通过英语翻译教学中学生译文暴露的几类问题 ,提出加强大学英语翻译教学、培养本科生翻译能力 ,应从英汉语言和文化的对比以及语言能力的提高两方面进行。翻译教学模式应从以教师为中心转向以学生为中心 ,培养学生负责任、独立工作的能力。     

运用价格杠杆促进沈阳市水资源可持续利用

沈阳市是一个严重缺水的城市,保证水资源的效率分配对社会经济发展具有举足轻重的作用。水资源的合理需求难以自发形成,必须通过需求管理来实现,本文对沈阳市城市用水现状进行了分析,并进一步探讨了其经济原因,从而提出了利用价格杠杆调节城市用水供求的建议。     

开放性:实践美学的发展策略

实践美学经过百余年的发展已成为一门较为成熟的美学学派 ,但进入 2 0世纪 90年代以后受到了来自各方面的责难与挑战。要坚持和发展实践美学 ,就应当在体系、范畴和话语等方面采取全方位开放的策略。而实践美学的全方位开放最终还是要归结到实践美学学者心态和思想的开放。     

论语文教师的角色定位

语文教育所面临的问题和改革的任务 ,对语文教师的角色内涵提出了新的要求。语文教师转变课堂教学观念 ,树立崭新的语文课程性质观 ,并担当好教学的设计者、学习的促进者、终身学习者和研究者的角色 ,是中小学语文教育走出“少慢差费”困境的一个关键     

复射线ABCD定律及初步应用

根据复变函数解析开拓原理提出了复射线的ＡＢＣＤ定律，并用它说明了高斯光束复参数的ＡＢＣＤ定律与几何先学ＡＢＣＤ定律的内在联系。