1972年,联合国在瑞典斯德哥尔摩召开全球第一次人类环境会议,正式把每年的6月5日确定为"世界环境日",目的,就是要提醒全人类关注全球环境状况和人类活动对环境的危害,强调保护和改善人类环境的重要性。2014世界环境日主题2014年世界环境日的
城市环境与农村环境唇齿相依,农村环境保护不好,不仅损害农民的利益,还会严重影响城市居民的菜篮子、米袋子、水缸子。而农村环保长期以来缺少环境治理和监管环节,致使农村环境治理链条断在"最后一公里",亟待引起高度重视。近几年来,四川省广元
In this paper, we introduce a multi-material arbitrary Lagrangian and Eulerian method for the hydrodynamic radiative multi-group diffusion model in 2D cylindrical coordinates. The basic idea in the co
Using the NCEP/NCAR reanalysis and the ENSO indices from the Climate Prediction Center over the period 1978-2014,we have investigated the contemporaneous circulation variations in the Northern and Sou
通过对明清时期(1368AD-1911AD)晋陕蒙毗邻地区历史资料的搜集整理,统计分析了该地区洪涝灾害的时空分布特征。结果表明:近544a间,晋陕蒙毗邻地区共发生洪涝灾害200次,其中小水灾、中水灾、大水灾和特大水灾,分别占洪涝灾害总数的18.50%,41.00%,31.50%,10.00%,各级涝灾分别存在5a左右,20a左右,30a左右,60a左右的周期。在时间分布上,洪涝灾害发生频率的变化呈
Background: Melanin?based coloration is often found to be associated with variations in physiological and behavio?ral traits that are essential in avian communication.However,the function of melanin?b
Background: Noninvasive and nondestructive DNA sampling techniques are becoming more important in genetic studies because they can provide genetic material from wild animals with less or even without
Background: Females can differentially deposit the immune factor lysozyme into eggs based on conditions of local breeding density and laying order.Materials: We collected 80 eggs from Great Cormorants
Two homogenized datasets of daily maximum temperature(Tmax), mean temperature(Tm), and minimum temperature(Tmin) series in China have recently been developed. One is CHTM3.0, based on the Multiple Ana
1 2015年期刊影响力指标(1)据中国科学技术信息研究所的统计中国科学技术信息研宂所2015年10月发布了《2015年版中国科技期刊引证报告(核心版)》,对全国2383种核心期刊发表论文的引用情况进行统计和分析。