The level and pattern of contamination by polychlorinated biphenyls (PCBs) were investigated in tilapia, Oreochromis mossambicus (Peters), sediment, and water from the Shing Mun River. The range of total PCBs was 12.9...The level and pattern of contamination by polychlorinated biphenyls (PCBs) were investigated in tilapia, Oreochromis mossambicus (Peters), sediment, and water from the Shing Mun River. The range of total PCBs was 12.9 ng/g to 181.6 ng/g wet weight in tilapia, 12.7 ng/g to 46.0 ng/g freeze-dried weight in sediment, and 3.8 ng/L to 13.6 ng/L in water. The effect of biomagnification was also observed, PCB concentrations increased from water to sediment to tilapia. PCB congeners occurred in such a way that lower chlorinated PCBs comprised a higher fraction of the total PCBs in water, sediment, and tilapia muscle, whereas higher chlorinated PCBs were more commonly found only in tilapia.展开更多
The novel The Rise and Fall of Wing Shing Street delves into the reality of Hong Kong residents deeply attuned to spatial awareness but detached from temporal significance,entangling emotions surrounding time and spac...The novel The Rise and Fall of Wing Shing Street delves into the reality of Hong Kong residents deeply attuned to spatial awareness but detached from temporal significance,entangling emotions surrounding time and space.Through narrative interruption and extension,the author portrays the genuine struggles of Hong Kong inhabitants-juxtaposing the blurred boundaries of time and space and the inherent rootlessness of reality within a fictionalized framework.Emphasizing the 20th-century human condition,wherein spatial awareness overshadows temporal understanding,the novel underscores the consequences:a loss of history and cultural identity.With a fresh perspective,the narrative explores the interplay of time and space,accentuating both the fictitious and authentic dimensions.This prompts readers to reconsider their history,culture,and the current moment,ultimately highlighting the pivotal role of temporal awareness.展开更多
美籍华人丘成桐先生是当代国际著名数学家,27岁攻克世界数学难题,33岁获得有世界数学界诺贝尔奖之称的Fields奖,成为华人数学家第一个获得这项大奖的数学家。1994年,获得瑞典皇家科学院为弥补诺贝尔奖未设数学奖而专门设立的国际大奖Cra...美籍华人丘成桐先生是当代国际著名数学家,27岁攻克世界数学难题,33岁获得有世界数学界诺贝尔奖之称的Fields奖,成为华人数学家第一个获得这项大奖的数学家。1994年,获得瑞典皇家科学院为弥补诺贝尔奖未设数学奖而专门设立的国际大奖Crafoord奖。2003年获中国政府颁发的"中华人民共和国国际科学技术合作奖",2010年获沃尔夫数学奖(Wolf Prize in Mathematics)和亚裔工程奖。他的成长历程可以给我们很多启发,不少经验值得借鉴和学习。同时,还为中国的数学发展建言献策,做出了无私贡献。展开更多
文摘The level and pattern of contamination by polychlorinated biphenyls (PCBs) were investigated in tilapia, Oreochromis mossambicus (Peters), sediment, and water from the Shing Mun River. The range of total PCBs was 12.9 ng/g to 181.6 ng/g wet weight in tilapia, 12.7 ng/g to 46.0 ng/g freeze-dried weight in sediment, and 3.8 ng/L to 13.6 ng/L in water. The effect of biomagnification was also observed, PCB concentrations increased from water to sediment to tilapia. PCB congeners occurred in such a way that lower chlorinated PCBs comprised a higher fraction of the total PCBs in water, sediment, and tilapia muscle, whereas higher chlorinated PCBs were more commonly found only in tilapia.
文摘The novel The Rise and Fall of Wing Shing Street delves into the reality of Hong Kong residents deeply attuned to spatial awareness but detached from temporal significance,entangling emotions surrounding time and space.Through narrative interruption and extension,the author portrays the genuine struggles of Hong Kong inhabitants-juxtaposing the blurred boundaries of time and space and the inherent rootlessness of reality within a fictionalized framework.Emphasizing the 20th-century human condition,wherein spatial awareness overshadows temporal understanding,the novel underscores the consequences:a loss of history and cultural identity.With a fresh perspective,the narrative explores the interplay of time and space,accentuating both the fictitious and authentic dimensions.This prompts readers to reconsider their history,culture,and the current moment,ultimately highlighting the pivotal role of temporal awareness.
文摘美籍华人丘成桐先生是当代国际著名数学家,27岁攻克世界数学难题,33岁获得有世界数学界诺贝尔奖之称的Fields奖,成为华人数学家第一个获得这项大奖的数学家。1994年,获得瑞典皇家科学院为弥补诺贝尔奖未设数学奖而专门设立的国际大奖Crafoord奖。2003年获中国政府颁发的"中华人民共和国国际科学技术合作奖",2010年获沃尔夫数学奖(Wolf Prize in Mathematics)和亚裔工程奖。他的成长历程可以给我们很多启发,不少经验值得借鉴和学习。同时,还为中国的数学发展建言献策,做出了无私贡献。
