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科技新闻选读 20220627
刘景欣 2022-6-27 11:37
https://phys.org/news/2022-06-friends-people-drawn.html?utm_source=nwletterutm_medium=emailutm_campaign=daily-nwletter Friends at first sniff: People drawn to others who smell like them 闻起来气味相投的人更容容易互相吸引成为好友。 Ralted paper https://www.science.org/doi/10.1126/sciad ...
个人分类: 读文献|1086 次阅读|没有评论
科研论文选读-20220623
刘景欣 2022-6-23 09:18
https://royalsocietypublishing.org/doi/10.1098/rspb.2022.0562 Evidence of attack deflection suggests adaptive evolution of wing tails in butterflies https://phys.org/news/2022-06-evidence-butterflies-tails-distract-predators.html https://royalsocietypublishing.org/doi/10.1098/rspb ...
个人分类: 读文献|1158 次阅读|没有评论
standard errors and confidence interval
刘景欣 2020-3-25 15:25
The standard error of the sample mean is the standard deviation in sample means across samples , i.e. a measure of the variability (or uncertainty) in the sample mean across samples. What is meant by 95% confidence with regard to a 95% confidence interval for the mean ? ...
个人分类: R 学习|2032 次阅读|没有评论
the Pearson correlation coefficient (r) between X and Y
刘景欣 2020-3-25 15:12
If the Pearson correlation coefficient (r) between X and Y is 0, does this mean there is no relationship between X and Y ? NOOO!!! A correlation of zero implies that there is no LINEAR relationship between X and Y. It is possible that a strong curvilinear relationship can have a correlation c ...
个人分类: R 学习|3022 次阅读|没有评论
基于系统发育关系的世界热带森林区系
刘景欣 2018-2-13 11:15
Phylogenetic classification of the world’s tropical forests http://www.pnas.org/content/early/2018/01/31/1714977115 five principal floristic regions and their floristic relationships were shown: ( i ) Indo-Pacific, ( ii ) Subtropical, ( iii ) African, ( iv ) American, and ( v ) D ...
个人分类: 读文献|2040 次阅读|没有评论
终于有证据了!
刘景欣 2016-4-29 09:16
中国科学院西双版纳热带植物园的 名人名树园有一棵1986年由英国菲利普亲王 手植的望天树,到现在已经有30年( http://www.xtbg.ac.cn/xwzx/zhxw/201503/t20150304_4317213.html),一直觉得不够高大、挺拔,而且分枝很低,和在野外森林中见到的望天树的高大形象不符。我之前猜想,是由于没有竞争,光环境太好,它不 ...
个人分类: 读文献|2420 次阅读|没有评论
害虫吃庄稼,庄稼产量竟然可以更高!!!!
热度 1 刘景欣 2016-4-24 14:56
http://onlinelibrary.wiley.com/wol1/doi/10.1002/ece3.2003/full The plant damage caused by each pest species individually had, as expected, either no, or a negative impact on seed yield and the strongest negative effect was caused by pollen beetles. However, seed yield increased when plant da ...
个人分类: 读文献|2869 次阅读|1 个评论 热度 1
一类手机app
刘景欣 2016-4-1 20:58
http://bioscience.oxfordjournals.org/content/early/2016/03/04/biosci.biw016.abstract?papetoc
1791 次阅读|没有评论

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