Sentiment analysis of the Twitter response to Netflix's Our Planet documentary

The role of nature documentaries in shaping public attitudes and behavior toward conservation and wildlife issues is unclear. We analyzed the emotional content of over 2 million tweets related to Our Planet, a major nature documentary released on Netflix, with dictionary and rule-based automatic sentiment analysis. We also compared the sentiment associated with species mentioned in Our Planet and a set of control species with similar features but not mentioned in the documentary. Tweets were largely negative in sentiment at the time of release of the series. This effect was primarily linked to the highly skewed distributions of retweets and, in particular, to a single negatively valenced and massively retweeted tweet (>150,000 retweets). Species mentioned in Our Planet were associated with more negative sentiment than the control species, and this effect coincided with a short period following the airing of the series. Our results are consistent with a general negativity bias in cultural transmission and document the difficulty of evoking positive sentiment, on social media and elsewhere, in response to environmental problems.     

农药在土壤－水环境中归宿的主要支配因素──吸附和脱附

综述了近年来农药在土壤－水环境中吸附－脱附研究的实验方法、影响因素、数学描述、作用机理等方面的工作。重点讨论了农药与土壤粘土矿物、有机物（腐殖酸、富菲酸等）的物理化学键合机理。     

非离子表面活性剂对菲在水/土壤界面间吸附行为的影响

比较研究了不同浓度非离子表面活性剂TX 10 0存在下 ,4种土壤对菲的吸附作用 .研究表明 ,TX 10 0浓度小于 2CMC时 ,有机碳含量 (foc)分别为 5 1× 10 3 mg kg、1 2 8× 10 4 mg kg的土壤对菲的吸附作用增强 ,即K d Kd 比值大于 1,且随TX 10 0浓度的增大而增大 ;foc分别为 3 31× 10 4 mg kg、6 4 8× 10 4 mg kg的土壤 ,则降低土壤对菲的吸附作用 ,即K d Kd 比值小于 1,且随TX 10 0浓度的增大而减小 .当加入的TX 10 0浓度大于 2CMC时 ,则明显降低土壤对菲的吸附作用 .菲的K d Kd 比值随土壤有机碳含量的增加而降低 ,而表观有机碳标化的吸附系数K oc 则随TX 10 0浓度的增大而减小 .影响机理由吸附态和溶解态的TX 10 0分别对菲的吸附作用和增溶作用决定 .