重金属铅的生态效应及其地球化学循环   总被引：2，自引：0，他引：2  

刘奇  王化可  李文达 《安徽教育学院学报》2005,23(6):97-100

随着工业化的快速发展,大量工业废弃物的无达标排放到环境中,造成了环境污染.其中重金属污染更是引起了人们的高度重视,很多学者对重金属的生态效应及地球化学循环进行了比较深入、系统的研究.本文仅以重金属铅为例,就近年来国内外学者对其的生态学效应、地化循环研究进行了综述,为以后进一步探讨铅污染问题提供有益的借鉴.  相似文献   

寒春过后看世界“变暖说”     

苏杨 《科技成果管理与研究》2010,(10):78-81

本文针对目前的热点话题——全球气候变暖,提出了三个疑问：气候真的在异常变暖吗？气候变暖真的有害吗？即便气候真的在异常变暖,主要是人为排放温室气体所致吗？经论证分析,本文认为气候变化是一个还没有定论的科学前沿问题,和政治、经济有关,但应该和公众无关。  相似文献   

Evaluating effects of atmospheric CO2 on stability of global climate: a cell-to-cell mapping approach     

HUANG Li  LIU Xin-an  JIA Charles Q. 《重庆大学学报(英文版)》2010,9(1):1-11

Atmospheric carbon dioxide concentration [CO2], incoming solar radiation and sea ice coverage are among the most important factors that control the global climate. By applying the simple cell-to-cell mapping technique to a simplified atmosphere-ocean-sea ice feedback climate model, effects of these factors on the stability of the climatic system are studied. The current climatic system is found to be stable but highly nonlinear. The resiliency of stability increases with [CO2] to a summit when [CO2] reaches 290 μL/L which is comparable to the pre-industrial level, suggesting carbon dioxide is essential to the stability of the global climate. With [CO2] rising further, the global climate stability decreases, the mean ocean temperature goes up and the sea ice coverage shrinks in the polar region. When the incoming solar radiation is intensified, the ice coverage gradually diminishes, but the mean ocean temperature remains relatively constant. Overall, our analysis suggests that at the current levels of three external factors the stability of global climate is highly resilient. However, there exists a possibility of extreme states of climate, such as a snow-ball earth and an ice-free earth.  相似文献   

世界银行治理结构改革与中国的应对策略?     

叶扬  张文 《黑龙江生态工程职业学院学报》2015,(3):82-90

世界银行在全球经济治理中发挥着重要作用,但随着新兴经济体的崛起和近年来金融危机、债务危机频发,世界银行治理结构所存在的制度性缺陷显露无遗,相应改革势在必行。但是,由于世界银行具有公共组织与股份公司的双重属性,使得改革方向出现分歧,改革进程推进缓慢。从根本上说,世界银行改革中发达国家与发展中国家并不存在不可调和的利益冲突,在减贫等问题上双方存在着合作的基础。中国应积极推进世界银行治理结构改革：首先,必须明确“负责任、有作为的大国”定位,表现出推动改革的积极态度;其次,要紧密围绕“发展”主题,注重长远利益;再次,要加强对世界银行人事安排的参与;最后,要积极构建世界银行框架下发展中国家沟通与合作的正式协调机制。  相似文献   

体育全球化的文化反思   总被引：14，自引：2，他引：14  

黄亚玲  马国英 《山东体育学院学报》2001,17(2):7-10

体育全球化的实质是欧美化。奥林匹克是当今体育思想、组织制度、内容形式的集大成者，欧美中心主义表现得淋漓尽致．其特征是“输出”意识强烈、排他性、强化认同。欧美中心主义的体育全球化与人类的理想是相冲突的。在新的世纪，体育全球化是不可阻挡的潮流，但体育全球化必须以文化的差异为基点，充分认识世界体育发展主体的多元性。中西方体育文化的融合是体育发展的选择。  相似文献   

“Stop sending your kids across our border:” Discursively constructing the unaccompanied youth migrant     

Mary Grace Antony  Ryan J. Thomas 《Journal of International and Intercultural Communication》2017,10(1):4-24

The recent migration of 65,000 children across the southwestern border, coupled with allegations of abuse by the U.S. Border Patrol, enables the investigation of an overlooked immigrant category: the unaccompanied youth migrant. Analyzing audience responses to news reports of the abuse, we find that established disparaging immigrant tropes apply, describing the children as an economic burden, disease carriers, and offspring of irresponsible families. We uncover two new themes: Youth migrants are channels whereby criminals may infiltrate the U.S., and manipulate legal authorities to remain in the U.S. Finally, we demonstrate how global compassion is strategically deployed to qualify harsh retaliatory measures.  相似文献   

Korean-Wave celebrities between global capital and regional nationalisms     

Olga Fedorenko 《Inter-Asia Cultural Studies》2017,18(4):498-517

This article examines conflicts over the transnationalization of South Korean celebrities in the wake of the Korean Wave (Hallyu) in the twenty-first century. I consider a number of celebrity controversies to argue that the demands placed upon Hallyu celebrities by domestic observers, foreign audiences, and global capital are fundamentally irreconcilable. South Korean nationalist appropriation of Hallyu, as well as the local celebrity culture, demand that Hallyu stars firstly be exemplary Korean patriots, whereas international audiences expect sympathy for their own causes. Local nationalist agendas have proven particularly troublesome because of postcolonial sensibilities and ongoing territorial disagreements between South Korea and its neighbors. Finally, as circulating commodities and commercial assets, Hallyu stars are also pledged to global capital. Their value is highest when they appeal to as broad an audience as possible and alienate no one with their politics. An apolitical neutrality on regionally controversial issues, however, is an untenable position when antagonistic geopolitical interests are concerned and nationalist passions flare. I situate this argument within critical scholarship on cultural globalization flows within Asia, while engaging celebrity studies to frame Hallyu stars as transnational commodities.  相似文献   

从教育研究视角检讨“越是民族的就越是世界的”     

吴定初  曾文婕 《四川师范大学学报(社会科学版)》2004,31(2):129-133

“越是民族的就越是世界的”这一命题的关键词不是无条件的。如果从一般教育、教育研究和教育研究现代化三个视角对该命题成立的条件进行检讨,则只有代表、反映或暗合了人类教育和教育研究及其发展的方向,越是民族的教育、教育研究和教育研究现代化中的“精华”,才越可能是“世界的”,反之则不可能成为“世界的”。  相似文献   

论高中历史教学方法的转变--基于全球史观的视角     

胡佳新 《科教文汇》2015,(7)

全球史观作为当前史学界较为赞同的观念,其新的史学理论与方法是对传统世界史中“欧洲中心论”的批判。不仅给史学研究指出了新的发展方向,也为中学历史学习提供了新的视角。高中历史新课程中借鉴和吸收了全球史观的观点,也使得历史教学方法的转变具有了契合性,推动了高中历史课程改革的进程。  相似文献   

GPS大数据库分区访问特征分割算法     

罗莉 《科技通报》2015,(4)

研究GPS全球定位系统大数据库的分区方位特征分割问题,提高GPS大数据访问的抗干扰能力。传统方法采用基于块匹配的GPS大数据定位信号调度方法实现数据访问,在弱信号强干扰环境下干扰抑制能力差,算法稳健性不好。为解决这一问题,提出一种基于模式匹配的GPS大数据库分区访问特征分割算法,构建GPS大数据库数据访问模型,数据块按可靠性需求划分为若干个等级,得到储节点模块匹配模型,设计GPS大数据信息流集合划分机制,对流量信息占用概率进行特征匹配,实现GPS大数据库分区访问特征分割,通过计算数据访问的精确度和抗干扰能力等指标进行性能测试分析,仿真结果表明,采用该算法能较好地反映GPS大数据信息流的分区特征,特征分割效果较好,数据访问中抗干扰能力强,实时性好,GPS大数据定位信息访问精度较高,具有优越性。  相似文献